/* roulang page: index */
:root {
    --bg: #060B16;
    --bg-soft: #0B1220;
    --glass: rgba(255,255,255,0.05);
    --glass-strong: rgba(255,255,255,0.09);
    --stroke: rgba(255,255,255,0.10);
    --stroke-light: rgba(255,255,255,0.16);
    --primary: #2E6BFF;
    --primary-deep: #174ED8;
    --cyan: #19C6FF;
    --accent: #D6FF3D;
    --danger: #FF6B5E;
    --text: #F2F6FC;
    --text-2: #A6B3C6;
    --text-3: #65748C;
    --grad: linear-gradient(120deg, #2E6BFF, #19C6FF);
    --radius: 14px;
    --radius-lg: 20px;
    --shadow: 0 12px 32px rgba(2,6,16,0.45);
    --glow: 0 8px 30px rgba(46,107,255,0.45);
  }

  * {
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    padding-bottom: 64px;
  }

  body.nav-open {
    overflow: hidden;
  }

  a {
    color: inherit;
    text-decoration: none;
  }

  img {
    max-width: 100%;
    display: block;
  }

  button, input {
    font: inherit;
  }

  h1, h2, h3, h4, p {
    margin: 0;
  }

  h1 {
    font-size: clamp(32px, 5.6vw, 62px);
    font-weight: 800;
    line-height: 1.22;
    letter-spacing: -0.01em;
  }

  h2 {
    font-size: clamp(26px, 3.2vw, 38px);
    font-weight: 700;
    line-height: 1.3;
  }

  h3 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
  }

  a:focus-visible,
  button:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 2px;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
  }

  .section {
    padding: 96px 0;
  }

  .section-head {
    max-width: 700px;
    margin-bottom: 44px;
  }

  .section-head h2 {
    margin-top: 10px;
  }

  .section-tag {
    display: inline-block;
    background: rgba(46,107,255,0.16);
    border: 1px solid rgba(46,107,255,0.32);
    color: var(--cyan);
    font-size: 13px;
    letter-spacing: 0.04em;
    padding: 5px 14px;
    border-radius: 999px;
  }

  .split {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 24px;
    max-width: none;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    padding: 0 24px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    border: 0;
    cursor: pointer;
    transition: all 0.25s ease;
    background: transparent;
    color: #fff;
  }

  .btn-primary {
    background: var(--grad);
    color: #fff;
    box-shadow: var(--glow);
  }

  .btn-primary:hover {
    filter: brightness(1.08);
    transform: translateY(-2px);
    box-shadow: 0 12px 36px rgba(46,107,255,0.55);
  }

  .btn-primary:active {
    transform: translateY(0);
    filter: brightness(0.95);
  }

  .btn-secondary {
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--stroke);
    color: #fff;
  }

  .btn-secondary:hover {
    border-color: rgba(46,107,255,0.5);
    background: rgba(46,107,255,0.1);
  }

  .btn-lg {
    height: 52px;
    padding: 0 32px;
    font-size: 16px;
    border-radius: 14px;
  }

  .btn-accent {
    background: var(--accent);
    color: #0A1428;
    font-weight: 700;
  }

  .btn-accent:hover {
    box-shadow: 0 0 0 4px rgba(214,255,61,0.18);
    transform: translateY(-2px);
  }

  .text-link {
    color: var(--cyan);
    font-weight: 600;
    font-size: 15px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
  }

  .text-link:hover {
    text-decoration: underline;
  }

  .text-link .arrow {
    transition: transform 0.2s ease;
  }

  .text-link:hover .arrow {
    transform: translateX(4px);
  }

  .badge {
    display: inline-flex;
    align-items: center;
    background: rgba(46,107,255,0.18);
    color: var(--cyan);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
  }

  .topbar {
    height: 36px;
    background: rgba(4,8,16,0.85);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
  }

  .topbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
  }

  .topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--text-2);
  }

  .topbar-domain {
    color: var(--text);
    font-weight: 600;
    letter-spacing: 0.02em;
  }

  .topbar-tag {
    color: var(--text-3);
  }

  .topbar-right {
    display: flex;
    gap: 20px;
    font-size: 12px;
  }

  .topbar-right a {
    color: var(--text-2);
    transition: color 0.2s ease;
  }

  .topbar-right a:hover {
    color: var(--cyan);
  }

  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: 72px;
    display: flex;
    align-items: center;
    background: transparent;
    transition: all 0.3s ease;
  }

  .site-header.scrolled {
    height: 60px;
    background: rgba(5,9,18,0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
  }

  .brand-name {
    font-size: 20px;
    font-weight: 700;
    white-space: nowrap;
    letter-spacing: 0.01em;
    color: var(--text);
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: 28px;
  }

  .nav-link {
    font-size: 15px;
    color: var(--text-2);
    font-weight: 500;
    letter-spacing: 0.02em;
    position: relative;
    padding: 6px 0;
    transition: color 0.2s ease;
  }

  .nav-link:hover {
    color: var(--text);
  }

  .nav-link.active {
    color: var(--text);
  }

  .nav-link.active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    border-radius: 2px;
    background: var(--grad);
    box-shadow: 0 0 12px rgba(46,107,255,0.8);
  }

  .nav-cta {
    height: 40px;
    padding: 0 18px;
    font-size: 14px;
    margin-left: 8px;
  }

  .nav-toggle {
    display: none;
    background: none;
    border: 0;
    width: 40px;
    height: 40px;
    position: relative;
    cursor: pointer;
    padding: 8px;
  }

  .nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: #fff;
    margin: 4px auto;
    border-radius: 2px;
    transition: all 0.3s ease;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .hero {
    position: relative;
    min-height: 82vh;
    display: flex;
    align-items: center;
    padding: 64px 0;
    overflow: hidden;
  }

  .hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/backpic/back-1.png');
    background-size: cover;
    background-position: center;
    opacity: 0.18;
    z-index: 0;
  }

  .hero-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(6,11,22,0.95) 0%, rgba(6,11,22,0.72) 45%, rgba(6,11,22,0.42) 100%);
  }

  .hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255,255,255,0.08) 1px, transparent 1px);
    background-size: 28px 28px;
    z-index: 1;
    pointer-events: none;
  }

  .hero .track-line {
    position: absolute;
    left: 16%;
    bottom: 12%;
    width: 58%;
    border-top: 2px dashed rgba(46,107,255,0.35);
    transform: rotate(-4deg);
    z-index: 1;
    pointer-events: none;
  }

  .hero-inner {
    position: relative;
    z-index: 2;
    width: 100%;
  }

  .hero-content {
    padding-right: 48px;
  }

  .hero-badge {
    display: inline-block;
    background: rgba(46,107,255,0.16);
    border: 1px solid rgba(46,107,255,0.35);
    color: var(--cyan);
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 13px;
    margin-bottom: 20px;
    letter-spacing: 0.04em;
  }

  .hero h1 {
    max-width: 640px;
    margin-bottom: 20px;
  }

  .hero-sub {
    font-size: 18px;
    color: var(--text-2);
    max-width: 520px;
    margin: 0 0 32px;
    line-height: 1.7;
  }

  .hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 32px;
  }

  .hero-points {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .hero-points li {
    font-size: 13px;
    color: var(--text-2);
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--stroke);
    border-radius: 999px;
    padding: 6px 14px;
  }

  .hero-visual {
    position: relative;
  }

  .hero-visual img {
    width: 100%;
    max-width: 500px;
    margin-left: auto;
    border-radius: 20px;
    border: 1px solid var(--stroke);
    box-shadow: var(--shadow);
  }

  .hero-float {
    position: absolute;
    right: 8px;
    top: 16px;
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.16);
    border-radius: 14px;
    padding: 10px 16px;
    font-size: 13px;
    color: var(--text-2);
    box-shadow: var(--shadow);
  }

  .features {
    position: relative;
  }

  .features .grid-x {
    row-gap: 24px;
  }

  .feature-card {
    position: relative;
    height: 100%;
    background: var(--glass);
    border: 1px solid var(--stroke);
    border-radius: var(--radius);
    padding: 28px;
    transition: all 0.3s ease;
    clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  }

  .feature-card:hover {
    transform: translateY(-4px);
    background: var(--glass-strong);
    border-color: rgba(46,107,255,0.45);
    box-shadow: 0 16px 40px rgba(2,6,16,0.35), 0 0 0 1px rgba(46,107,255,0.15);
  }

  .feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: rgba(46,107,255,0.14);
    color: var(--cyan);
    margin-bottom: 16px;
  }

  .feature-card h3 {
    margin-bottom: 10px;
  }

  .feature-card p {
    color: var(--text-2);
    font-size: 15px;
    margin-bottom: 16px;
  }

  .feature-more {
    font-size: 14px;
    color: var(--cyan);
    font-weight: 600;
  }

  .feature-more:hover {
    text-decoration: underline;
  }

  .scenario {
    background: var(--bg-soft);
  }

  .scenario-media img {
    width: 100%;
    max-width: 560px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--stroke);
  }

  .scenario-content {
    padding-left: 48px;
  }

  .scenario-panel {
    margin: 24px 0 28px;
  }

  .step-item {
    position: relative;
    padding-left: 56px;
    padding-bottom: 28px;
  }

  .step-item:not(:last-child)::before {
    content: "";
    position: absolute;
    left: 17px;
    top: 34px;
    bottom: 4px;
    border-left: 2px dashed rgba(46,107,255,0.4);
  }

  .step-num {
    position: absolute;
    left: 0;
    top: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "DIN Alternate", "Barlow Condensed", monospace;
    font-size: 20px;
    font-weight: 700;
    color: var(--accent);
    background: rgba(214,255,61,0.08);
    border-radius: 10px;
    border: 1px solid rgba(214,255,61,0.18);
  }

  .step-item h3 {
    margin-bottom: 4px;
  }

  .step-item p {
    color: var(--text-2);
    font-size: 15px;
  }

  .proof {
    background: #081021;
  }

  .stats-row {
    margin-bottom: 40px;
  }

  .stat-item {
    text-align: center;
    padding: 20px 12px;
  }

  .stat-num {
    font-family: "DIN Alternate", "Barlow Condensed", monospace;
    font-size: 40px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
  }

  .stat-label {
    font-size: 12px;
    color: var(--text-3);
    margin-top: 6px;
    letter-spacing: 0.04em;
  }

  .quote-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--stroke);
    border-radius: var(--radius);
    padding: 24px;
    font-size: 15px;
    color: var(--text-2);
    line-height: 1.8;
    transition: all 0.3s ease;
  }

  .quote-card:hover {
    border-color: rgba(46,107,255,0.4);
    background: rgba(46,107,255,0.06);
  }

  .quote-title {
    display: block;
    color: var(--text);
    font-weight: 600;
    margin-bottom: 8px;
  }

  .news {
    background: var(--bg);
  }

  .news-grid > .cell {
    margin-bottom: 24px;
  }

  .news-card {
    background: rgba(255,255,255,0.03);
    border-radius: var(--radius);
    border: 1px solid var(--stroke);
    overflow: hidden;
    height: 100%;
    transition: all 0.3s ease;
  }

  .news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: rgba(46,107,255,0.35);
  }

  .news-thumb {
    height: 180px;
    overflow: hidden;
    background: var(--bg-soft);
  }

  .news-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
  }

  .news-card:hover .news-thumb img {
    transform: scale(1.04);
  }

  .news-card-body {
    padding: 22px;
  }

  .news-card-body h3 {
    font-size: 16px;
    line-height: 1.55;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.2s ease;
  }

  .news-card:hover .news-card-body h3 {
    color: var(--cyan);
  }

  .news-card-body p {
    font-size: 14px;
    color: var(--text-2);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 16px;
  }

  .news-meta {
    display: flex;
    gap: 10px;
    align-items: center;
    font-size: 12px;
    color: var(--text-3);
  }

  .empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-3);
  }

  .empty-state svg {
    width: 72px;
    height: 72px;
    color: rgba(46,107,255,0.6);
    margin: 0 auto 12px;
  }

  .faq-section {
    background: var(--bg-soft);
  }

  .faq-container {
    max-width: 860px;
  }

  .faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .faq-item {
    background: var(--glass);
    border: 1px solid var(--stroke);
    border-radius: 14px;
    padding: 18px 24px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
  }

  .faq-item.open {
    border-color: rgba(46,107,255,0.55);
    box-shadow: 0 8px 24px rgba(46,107,255,0.12);
  }

  .faq-q {
    width: 100%;
    background: none;
    border: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    padding: 4px 0;
  }

  .faq-plus {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: rgba(46,107,255,0.15);
    color: var(--cyan);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 16px;
    transition: transform 0.3s ease;
  }

  .faq-plus::before {
    content: "+";
    font-size: 20px;
    line-height: 1;
  }

  .faq-item.open .faq-plus {
    transform: rotate(45deg);
  }

  .faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
  }

  .faq-item.open .faq-a {
    max-height: 300px;
    padding-top: 12px;
  }

  .faq-a p {
    font-size: 14px;
    line-height: 1.75;
    color: var(--text-2);
  }

  .cta-band {
    padding: 96px 0;
  }

  .cta-inner {
    text-align: center;
    padding: 56px 24px;
    border-radius: 24px;
    position: relative;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(46,107,255,0.4);
    overflow: hidden;
  }

  .cta-inner::before {
    content: "";
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(46,107,255,0.35), transparent 70%);
    top: -80px;
    left: -80px;
  }

  .cta-inner::after {
    content: "";
    position: absolute;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle, rgba(25,198,255,0.25), transparent 70%);
    bottom: -60px;
    right: -60px;
  }

  .cta-inner h2 {
    position: relative;
    font-size: clamp(24px, 3vw, 32px);
    margin-bottom: 12px;
  }

  .cta-inner p {
    position: relative;
    color: var(--text-2);
    margin-bottom: 28px;
  }

  .cta-inner .btn {
    position: relative;
  }

  .site-footer {
    background: #04070F;
    border-top: 1px solid rgba(46,107,255,0.35);
    padding: 72px 0 0;
  }

  .footer-grid {
    row-gap: 32px;
  }

  .footer-brand .brand {
    margin-bottom: 16px;
  }

  .footer-brand p {
    color: var(--text-2);
    font-size: 14px;
    max-width: 320px;
    margin: 0 0 16px;
  }

  .footer-domain {
    font-size: 13px;
    color: var(--cyan);
    letter-spacing: 0.04em;
    font-weight: 600;
  }

  .footer-col h4 {
    font-size: 15px;
    margin-bottom: 16px;
    color: var(--text);
  }

  .footer-col a {
    display: block;
    font-size: 14px;
    color: var(--text-2);
    padding: 6px 0;
    transition: all 0.2s ease;
  }

  .footer-col a:hover {
    color: var(--cyan);
    padding-left: 4px;
  }

  .footer-col p {
    font-size: 14px;
    color: var(--text-2);
    margin: 0 0 8px;
  }

  .footer-bottom {
    margin-top: 48px;
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 20px 0;
    font-size: 13px;
    color: var(--text-3);
  }

  .mobile-bar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    background: rgba(6,11,22,0.85);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-top: 1px solid rgba(46,107,255,0.35);
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    padding-bottom: env(safe-area-inset-bottom);
    transform: translateY(110%);
    transition: transform 0.4s ease;
    box-shadow: 0 -8px 30px rgba(2,6,16,0.5);
  }

  .mobile-bar.show {
    transform: translateY(0);
  }

  .mobile-bar-text {
    font-size: 14px;
    color: var(--text-2);
  }

  .mobile-bar .btn {
    height: 40px;
    padding: 0 18px;
    font-size: 14px;
  }

  @media (max-width: 1023px) {
    .section {
      padding: 72px 0;
    }

    .site-header {
      height: 60px;
      background: rgba(5,9,18,0.82);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .site-header.scrolled {
      height: 56px;
    }

    .main-nav {
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      background: rgba(5,9,18,0.96);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: stretch;
      gap: 4px;
      padding: 20px 24px 28px;
      border-bottom: 1px solid var(--stroke);
      transform: translateY(-8px);
      opacity: 0;
      pointer-events: none;
      transition: all 0.35s ease;
    }

    .main-nav.open {
      transform: translateY(0);
      opacity: 1;
      pointer-events: auto;
    }

    .nav-link {
      width: 100%;
      font-size: 16px;
      padding: 12px 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .nav-link.active::after {
      display: none;
    }

    .nav-link.active {
      color: var(--cyan);
    }

    .nav-cta {
      margin: 16px 0 0;
      width: 100%;
    }

    .nav-toggle {
      display: block;
    }

    .hero {
      min-height: auto;
      padding: 56px 0 64px;
    }

    .hero-content {
      padding-right: 0;
      margin-bottom: 48px;
    }

    .hero-visual img {
      margin: 0 auto;
    }

    .hero h1 {
      max-width: 640px;
    }

    .hero-sub {
      font-size: 16px;
    }

    .scenario-content {
      padding-left: 0;
      margin-top: 40px;
    }

    .split {
      flex-direction: column;
      align-items: flex-start;
    }
  }

  @media (max-width: 639px) {
    body {
      padding-bottom: 56px;
    }

    .section {
      padding: 60px 0;
    }

    .topbar {
      height: 32px;
    }

    .topbar-tag {
      display: none;
    }

    .topbar-right a:last-child {
      display: none;
    }

    .brand-name {
      font-size: 17px;
    }

    .brand-mark {
      width: 32px;
      height: 32px;
    }

    .hero-actions .btn {
      width: 100%;
    }

    .hero-points li {
      font-size: 12px;
    }

    .hero-float {
      display: none;
    }

    .stat-num {
      font-size: 32px;
    }

    .quote-card {
      padding: 20px;
    }

    .faq-item {
      padding: 16px 18px;
    }

    .faq-q {
      font-size: 15px;
    }

    .cta-inner {
      padding: 40px 20px;
    }

    .cta-inner .btn {
      width: 100%;
    }

    .footer-bottom {
      padding: 16px 0;
    }

    .mobile-bar {
      height: 56px;
    }

    .mobile-bar-text {
      font-size: 13px;
    }
  }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
:root {
  --bg: #060B16;
  --bg-soft: #0B1220;
  --glass: rgba(255, 255, 255, 0.05);
  --glass-strong: rgba(255, 255, 255, 0.09);
  --stroke: rgba(255, 255, 255, 0.10);
  --stroke-light: rgba(255, 255, 255, 0.16);
  --primary: #2E6BFF;
  --primary-deep: #174ED8;
  --cyan: #19C6FF;
  --accent: #D6FF3D;
  --danger: #FF6B5E;
  --text: #F2F6FC;
  --text-2: #A6B3C6;
  --text-3: #65748C;
  --grad: linear-gradient(120deg, #2E6BFF, #19C6FF);
  --radius: 14px;
  --radius-lg: 20px;
  --radius-round: 999px;
  --shadow: 0 12px 32px rgba(2, 6, 16, 0.45);
  --glow: 0 8px 30px rgba(46, 107, 255, 0.45);
  --blur: backdrop-filter: blur(18px);
}

/* ===== Reset / Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--cyan);
}
ul {
  list-style: none;
}
button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

/* ===== 容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ===== 顶部信息条 ===== */
.topbar {
  height: 36px;
  background: rgba(4, 8, 16, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.topbar-domain {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.02em;
}
.topbar-tag {
  font-size: 12px;
  color: var(--text-3);
  padding-left: 12px;
  border-left: 1px solid var(--stroke);
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 18px;
}
.topbar-right a {
  font-size: 12px;
  color: var(--text-2);
}
.topbar-right a:hover {
  color: var(--primary);
}

/* ===== 主导航 ===== */
.site-header {
  position: sticky;
  top: 36px;
  z-index: 100;
  height: 72px;
  display: flex;
  align-items: center;
  background: transparent;
  transition: all 0.3s ease;
}
.site-header.scrolled {
  background: rgba(5, 9, 18, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--stroke);
  height: 60px;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}
.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-link {
  font-size: 15px;
  color: var(--text-2);
  letter-spacing: 0.02em;
  position: relative;
  padding: 6px 2px;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--grad);
  border-radius: 2px;
  transition: width 0.25s ease;
}
.nav-link:hover {
  color: var(--text);
}
.nav-link:hover::after {
  width: 100%;
}
.nav-link.active {
  color: var(--text);
}
.nav-link.active::after {
  width: 100%;
  box-shadow: 0 0 12px rgba(46, 107, 255, 0.6);
}
.nav-cta {
  margin-left: 6px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius);
  padding: 10px 22px;
  letter-spacing: 0.02em;
  transition: all 0.25s ease;
  outline: none;
}
.btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--glow);
  filter: brightness(1.08);
}
.btn-primary:active {
  transform: translateY(0);
  filter: brightness(0.95);
}
.btn-outline {
  background: var(--glass);
  color: var(--text);
  border: 1px solid var(--stroke);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.btn-outline:hover {
  color: var(--text);
  border-color: var(--primary);
  background: rgba(46, 107, 255, 0.1);
}
.btn-outline:active {
  transform: scale(0.98);
}
.btn-accent {
  background: var(--accent);
  color: #0B1220;
  font-weight: 700;
}
.btn-accent:hover {
  color: #0B1220;
  box-shadow: 0 4px 24px rgba(214, 255, 61, 0.35);
  transform: translateY(-2px);
}
.btn-sm {
  padding: 8px 18px;
  font-size: 13px;
}
.btn-lg {
  padding: 14px 34px;
  font-size: 15px;
}

/* ===== 汉堡按钮 ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 10px;
  background: var(--glass);
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 24px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
}
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== 板块通用 ===== */
.section {
  padding: 88px 0;
}
.section+.section {
  border-top: 1px solid var(--stroke);
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
  background: rgba(214, 255, 61, 0.08);
  border: 1px solid rgba(214, 255, 61, 0.2);
  border-radius: var(--radius-round);
  padding: 5px 14px;
  margin-bottom: 16px;
}
.section-title {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--text);
  margin-bottom: 14px;
}
.section-desc {
  font-size: 16px;
  color: var(--text-2);
  line-height: 1.75;
  max-width: 680px;
  margin-bottom: 40px;
}

/* ===== 分类页头 ===== */
.category-hero {
  position: relative;
  min-height: 40vh;
  display: flex;
  align-items: center;
  padding: 72px 0;
  background: linear-gradient(180deg, rgba(6, 11, 22, 0.80), rgba(6, 11, 22, 0.95)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  border-bottom: 1px solid var(--stroke);
  overflow: hidden;
}
.category-hero::before {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(46, 107, 255, 0.14), transparent 70%);
  pointer-events: none;
}
.category-hero-inner {
  position: relative;
  z-index: 2;
}
.category-hero-content {
  max-width: 640px;
}
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-3);
  margin-bottom: 20px;
}
.breadcrumb a {
  color: var(--text-3);
}
.breadcrumb a:hover {
  color: var(--primary);
}
.breadcrumb-sep {
  color: var(--text-3);
  opacity: 0.6;
}
.category-hero h1 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 14px;
}
.category-hero h1 .highlight {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.category-hero-desc {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 28px;
}
.category-hero-image {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}
.category-hero-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--stroke);
  max-height: 360px;
  object-fit: cover;
  width: 100%;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* ===== 分类说明区 ===== */
.guide-section {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--stroke);
}
.guide-grid {
  display: flex;
  align-items: center;
  gap: 60px;
}
.guide-text {
  flex: 1 1 55%;
}
.guide-image-wrap {
  flex: 1 1 45%;
}
.guide-image-wrap img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--stroke);
  width: 100%;
  object-fit: cover;
}
.guide-list {
  margin-top: 28px;
}
.guide-list li {
  display: flex;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--stroke);
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.6;
}
.guide-list li:last-child {
  border-bottom: none;
}
.guide-list-check {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(214, 255, 61, 0.16);
  border: 1px solid rgba(214, 255, 61, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}
.guide-list-check svg {
  width: 12px;
  height: 12px;
  stroke: var(--accent);
  stroke-width: 2.5;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===== 内容卡片（横条） ===== */
.cards-section {
  background: var(--bg);
}
.card-stack {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.card-row {
  display: flex;
  align-items: center;
  gap: 28px;
  background: var(--glass);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  padding: 28px 32px;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: all 0.3s ease;
}
.card-row:hover {
  background: var(--glass-strong);
  border-color: rgba(46, 107, 255, 0.5);
  transform: translateY(-4px);
  box-shadow: var(--glow);
}
.card-row-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(46, 107, 255, 0.15);
  border: 1px solid rgba(46, 107, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}
.card-row-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--cyan);
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.card-row-body {
  flex: 1;
}
.card-row-body h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.card-row-body p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: 0;
}
.card-row-link {
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.25s ease;
}
.card-row-link:hover {
  color: var(--accent);
  gap: 10px;
}
.card-row-link svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===== FAQ ===== */
.faq-section {
  background: var(--bg-soft);
}
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}
.faq-item {
  background: var(--glass);
  border: 1px solid var(--stroke);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.faq-item.open {
  border-color: rgba(46, 107, 255, 0.5);
  box-shadow: 0 0 20px rgba(46, 107, 255, 0.12);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  background: transparent;
  text-align: left;
  transition: color 0.2s ease;
}
.faq-question:hover {
  color: var(--cyan);
}
.faq-icon {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.faq-icon svg {
  width: 14px;
  height: 14px;
  stroke: var(--text-2);
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  transition: stroke 0.3s ease;
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  border-color: var(--primary);
}
.faq-item.open .faq-icon svg {
  stroke: var(--cyan);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.faq-answer-inner {
  padding: 0 24px 18px;
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
}

/* ===== CTA 带 ===== */
.cta-band {
  position: relative;
  padding: 72px 0;
  background: linear-gradient(180deg, rgba(6, 11, 22, 0.6), rgba(6, 11, 22, 0.9)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  border-bottom: 1px solid var(--stroke);
  overflow: hidden;
}
.cta-band::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -120px;
  transform: translateX(-50%);
  width: 600px;
  height: 240px;
  background: radial-gradient(ellipse, rgba(46, 107, 255, 0.18), transparent 70%);
  pointer-events: none;
}
.cta-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}
.cta-inner h2 {
  font-size: 34px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 12px;
}
.cta-inner p {
  font-size: 16px;
  color: var(--text-2);
  margin-bottom: 32px;
}
.cta-inner .btn {
  min-width: 180px;
}

/* ===== 页脚 ===== */
.site-footer {
  background: #04070F;
  border-top: 1px solid rgba(46, 107, 255, 0.25);
  padding-top: 60px;
}
.footer-grid {
  padding-bottom: 40px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  margin: 16px 0 10px;
  max-width: 320px;
}
.footer-domain {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-3);
  letter-spacing: 0.04em;
  padding: 4px 12px;
  border: 1px solid var(--stroke);
  border-radius: var(--radius-round);
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--text-2);
  padding: 5px 0;
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-col a:hover {
  color: var(--primary);
  padding-left: 4px;
}
.footer-col p {
  font-size: 14px;
  color: var(--text-2);
  margin-bottom: 8px;
}
.footer-bottom {
  border-top: 1px solid var(--stroke);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: var(--text-3);
}

/* ===== 底部固定转化条 ===== */
.fixed-cta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
  height: 60px;
  background: rgba(6, 11, 22, 0.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-top: 1px solid rgba(46, 107, 255, 0.4);
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}
.fixed-cta.visible {
  transform: translateY(0);
}
.fixed-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
}
.fixed-cta-text {
  font-size: 14px;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
body {
  padding-bottom: 60px;
}

/* ===== 响应式 ===== */
@media (max-width: 1023px) {
  .site-header {
    top: 36px;
  }
  .nav-toggle {
    display: flex;
  }
  .main-nav {
    position: fixed;
    top: 108px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: rgba(5, 9, 18, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--stroke);
    padding: 16px 24px 24px;
    display: none;
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav .nav-link {
    width: 100%;
    font-size: 16px;
    padding: 13px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  .main-nav .nav-link::after {
    bottom: 6px;
  }
  .nav-cta {
    margin: 16px 0 0;
    width: 100%;
  }
  .category-hero {
    padding: 56px 0;
  }
  .category-hero h1 {
    font-size: 38px;
  }
  .category-hero-image {
    margin-top: 32px;
    justify-content: center;
  }
  .category-hero-image img {
    max-height: 280px;
  }
  .guide-grid {
    flex-direction: column;
    gap: 40px;
  }
  .guide-text,
  .guide-image-wrap {
    flex: 1 1 100%;
  }
  .card-row {
    padding: 22px 24px;
    flex-wrap: wrap;
  }
  .card-row-link {
    margin-left: 76px;
  }
  .section {
    padding: 64px 0;
  }
  .section-title {
    font-size: 28px;
  }
}

@media (max-width: 639px) {
  .site-header {
    top: 36px;
    height: 60px;
  }
  .brand-name {
    font-size: 17px;
  }
  .brand-mark {
    width: 32px;
    height: 32px;
  }
  .topbar-right a:last-child {
    display: none;
  }
  .topbar-tag {
    display: none;
  }
  .category-hero h1 {
    font-size: 30px;
  }
  .category-hero-desc {
    font-size: 15px;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .section-title {
    font-size: 24px;
  }
  .guide-list li {
    font-size: 14px;
  }
  .card-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    clip-path: none;
    border-radius: var(--radius);
  }
  .card-row-link {
    margin-left: 0;
  }
  .faq-question {
    padding: 16px 16px;
    font-size: 14px;
  }
  .faq-answer-inner {
    padding: 0 16px 16px;
    font-size: 13px;
  }
  .cta-inner h2 {
    font-size: 26px;
  }
  .cta-inner .btn {
    width: 100%;
    max-width: 320px;
  }
  .footer-grid {
    gap: 24px;
  }
  .fixed-cta {
    height: 56px;
  }
  body {
    padding-bottom: 56px;
  }
}

/* roulang page: article */
:root{
  --bg:#060B16;--bg-soft:#0B1220;--glass:rgba(255,255,255,.05);--glass-strong:rgba(255,255,255,.09);
  --stroke:rgba(255,255,255,.10);--stroke-light:rgba(255,255,255,.16);--primary:#2E6BFF;--primary-deep:#174ED8;
  --cyan:#19C6FF;--accent:#D6FF3D;--danger:#FF6B5E;--text:#F2F6FC;--text-2:#A6B3C6;--text-3:#65748C;
  --grad:linear-gradient(120deg,#2E6BFF,#19C6FF);--radius:14px;--radius-lg:20px;--radius-round:999px;
  --shadow:0 12px 32px rgba(2,6,16,.45);--glow:0 8px 30px rgba(46,107,255,.45);
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --mono:"DIN Alternate","Barlow Condensed",Consolas,Monaco,monospace;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block;border:0}
a{color:var(--cyan);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary)}
button{font-family:inherit;cursor:pointer}
.container{max-width:1200px;margin:0 auto;padding-left:24px;padding-right:24px}
/* topbar */
.topbar{height:36px;background:rgba(4,8,16,.85);border-bottom:1px solid rgba(255,255,255,.08);position:relative;z-index:60}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:100%}
.topbar-left{display:flex;align-items:center;gap:12px}
.topbar-domain{font-size:12px;color:var(--text-2);letter-spacing:.02em}
.topbar-tag{font-size:12px;color:var(--text-3);border:1px solid var(--stroke);border-radius:999px;padding:1px 10px}
.topbar-links{display:flex;align-items:center;gap:16px}
.topbar-link{font-size:12px;color:var(--text-2);transition:color .2s}
.topbar-link:hover{color:var(--primary)}
/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(6,11,22,.55);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);transition:all .3s ease;border-bottom:1px solid transparent}
.site-header.scrolled{background:rgba(5,9,18,.82);box-shadow:var(--shadow);border-bottom:1px solid rgba(255,255,255,.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;transition:height .3s ease;gap:16px}
.site-header.scrolled .header-inner{height:60px}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{width:36px;height:36px;flex-shrink:0}
.brand-name{font-size:20px;font-weight:700;letter-spacing:-.01em;color:var(--text);white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:28px;margin-left:auto}
.nav-link{font-size:15px;color:var(--text-2);letter-spacing:.02em;position:relative;padding:6px 0;transition:color .2s}
.nav-link:hover{color:var(--text)}
.nav-link.active{color:var(--text);font-weight:600}
.nav-link.active::after{content:"";position:absolute;left:0;bottom:-2px;width:100%;height:2px;background:var(--grad);border-radius:2px;box-shadow:0 0 12px rgba(46,107,255,.7)}
.nav-cta{height:40px;margin-left:8px}
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;background:transparent;border:1px solid var(--stroke);border-radius:12px;padding:0 10px;transition:all .25s}
.nav-toggle span{display:block;height:2px;background:var(--text);border-radius:2px;transition:transform .3s,opacity .3s}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;height:44px;padding:0 24px;border-radius:12px;font-size:14px;font-weight:600;letter-spacing:.02em;border:1px solid transparent;cursor:pointer;transition:all .25s ease;line-height:1;white-space:nowrap}
.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--glow)}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px);box-shadow:0 12px 36px rgba(46,107,255,.6)}
.btn-primary:active{transform:translateY(0);filter:brightness(.95)}
.btn-primary:focus-visible{outline:2px solid #fff;outline-offset:2px}
.btn-secondary{background:var(--glass);border-color:var(--stroke);color:var(--text)}
.btn-secondary:hover{border-color:var(--primary);background:rgba(46,107,255,.1)}
.btn-accent{background:var(--accent);color:#0a0f1a;box-shadow:0 4px 20px rgba(214,255,61,.3)}
.btn-accent:hover{box-shadow:0 0 28px rgba(214,255,61,.55);transform:translateY(-2px);filter:brightness(1.05)}
.btn-accent:active{transform:translateY(0)}
/* article hero */
.article-hero{position:relative;padding:64px 0 52px;border-bottom:1px solid var(--stroke);overflow:hidden}
.article-hero::before{content:"";position:absolute;inset:0;background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;opacity:.28;z-index:0}
.article-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,11,22,.45) 0%,rgba(6,11,22,.92) 100%);z-index:0}
.article-hero .container{position:relative;z-index:1}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:var(--text-3);margin-bottom:22px}
.breadcrumb a{color:var(--text-3);transition:color .2s}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{opacity:.6}
.breadcrumb .current{color:var(--text-2);max-width:480px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.article-hero h1{font-size:40px;font-weight:800;line-height:1.25;letter-spacing:-.01em;color:var(--text);max-width:820px;margin-bottom:20px}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:13px;color:var(--text-3)}
.article-meta .dot{color:var(--text-3);opacity:.5}
/* article wrap & body */
.article-wrap{max-width:760px;margin:0 auto;padding:52px 24px 24px}
.article-body{font-size:16px;line-height:1.85;color:var(--text)}
.article-body > *{margin-bottom:24px}
.article-body h2{font-size:24px;font-weight:700;line-height:1.4;color:var(--text);margin-top:40px;margin-bottom:16px}
.article-body h3{font-size:19px;font-weight:600;line-height:1.45;color:var(--text);margin-top:32px;margin-bottom:12px}
.article-body p{color:var(--text)}
.article-body a{color:var(--cyan);text-decoration:underline;text-underline-offset:4px}
.article-body a:hover{color:var(--primary)}
.article-body ul,.article-body ol{padding-left:22px;color:var(--text)}
.article-body li{margin-bottom:8px}
.article-body img{border-radius:12px;margin:12px 0}
.article-body blockquote{border-left:3px solid var(--primary);background:rgba(46,107,255,.08);border-radius:0 10px 10px 0;padding:18px 20px;color:var(--text-2)}
.article-body table{display:block;overflow-x:auto;max-width:100%;border-collapse:collapse;margin:20px 0;background:var(--glass);border-radius:12px}
.article-body th,.article-body td{display:table-cell;padding:12px 14px;border:1px solid var(--stroke);font-size:14px}
.article-body th{background:var(--bg-soft);color:var(--text);font-weight:600}
.article-body pre{display:block;overflow-x:auto;background:var(--bg-soft);border:1px solid var(--stroke);border-radius:12px;padding:18px;color:var(--text-2);font-family:var(--mono);font-size:14px;line-height:1.7}
.article-body code{background:var(--bg-soft);border:1px solid var(--stroke);border-radius:6px;padding:2px 8px;font-family:var(--mono);font-size:14px;color:var(--cyan)}
.article-body pre code{border:0;background:transparent;padding:0}
/* tags & back */
.article-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:36px;padding-top:24px;border-top:1px solid var(--stroke)}
.badge{display:inline-flex;align-items:center;background:rgba(46,107,255,.16);color:var(--cyan);font-size:12px;font-weight:500;letter-spacing:.04em;border-radius:6px;padding:5px 12px;border:1px solid rgba(46,107,255,.3)}
.article-back{margin-top:28px}
.article-back a{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--text-2);transition:color .2s}
.article-back a:hover{color:var(--primary)}
/* article empty */
.article-empty{position:relative;padding:110px 24px;text-align:center;border-bottom:1px solid var(--stroke)}
.article-empty .empty-icon{width:72px;height:72px;margin:0 auto 20px;opacity:.6}
.article-empty p{font-size:16px;color:var(--text-2);margin-bottom:24px}
/* related */
.related-section{padding:88px 0 24px;background:var(--bg-soft)}
.section-head{margin-bottom:36px}
.section-head h2{font-size:32px;font-weight:700;color:var(--text);letter-spacing:-.01em;margin-bottom:6px}
.section-head p{font-size:14px;color:var(--text-3)}
.related-card{height:100%}
.related-card a{display:flex;flex-direction:column;height:100%;background:var(--glass);border:1px solid var(--stroke);border-radius:14px;overflow:hidden;transition:all .3s ease}
.related-card a:hover{background:var(--glass-strong);border-color:rgba(46,107,255,.45);box-shadow:var(--shadow);transform:translateY(-4px)}
.related-card img{width:100%;height:160px;object-fit:cover}
.related-card h3{font-size:16px;font-weight:600;color:var(--text);padding:16px 20px 8px;line-height:1.45}
.related-card p{font-size:13px;color:var(--text-3);padding:0 20px 20px;line-height:1.6}
/* faq */
.faq-section{padding:88px 0}
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{background:var(--glass);border:1px solid var(--stroke);border-radius:14px;overflow:hidden;transition:border-color .3s,box-shadow .3s}
.faq-item.open{border-color:rgba(46,107,255,.5);box-shadow:0 0 24px rgba(46,107,255,.08)}
.faq-question{display:flex;align-items:center;justify-content:space-between;width:100%;padding:20px 24px;background:transparent;border:0;text-align:left;font-size:15px;font-weight:600;color:var(--text);gap:16px;transition:color .2s}
.faq-question:hover{color:var(--cyan)}
.faq-icon{position:relative;flex-shrink:0;width:22px;height:22px}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--text-2);border-radius:2px;transition:transform .3s,background .3s}
.faq-icon::before{left:3px;right:3px;top:10px;height:2px}
.faq-icon::after{top:3px;bottom:3px;left:10px;width:2px}
.faq-item.open .faq-icon::before{transform:rotate(180deg);background:var(--primary)}
.faq-item.open .faq-icon::after{transform:rotate(90deg);background:var(--primary)}
.faq-answer{display:none;padding:0 24px 20px;font-size:14px;line-height:1.75;color:var(--text-2)}
.faq-item.open .faq-answer{display:block;animation:fadeIn .3s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}
/* cta band */
.cta-band{position:relative;padding:80px 0;text-align:center;overflow:hidden;border-top:1px solid var(--stroke)}
.cta-band::before{content:"";position:absolute;inset:0;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;opacity:.18;z-index:0}
.cta-band::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 120%,rgba(46,107,255,.25),transparent 60%);z-index:0}
.cta-band .container{position:relative;z-index:1}
.cta-band h2{font-size:32px;font-weight:700;color:var(--text);margin-bottom:12px}
.cta-band p{font-size:15px;color:var(--text-2);max-width:520px;margin:0 auto 28px}
/* footer */
.site-footer{background:#04070F;border-top:1px solid rgba(46,107,255,.25)}
.footer-grid{padding:64px 24px 36px}
.footer-brand p{font-size:13px;color:var(--text-3);margin-top:14px;max-width:280px;line-height:1.7}
.footer-domain{display:inline-block;margin-top:14px;font-size:12px;color:var(--text-3);border:1px solid var(--stroke);border-radius:999px;padding:3px 12px}
.footer-col h4{font-size:14px;font-weight:600;color:var(--text);margin-bottom:14px}
.footer-col a{display:block;font-size:13px;color:var(--text-3);padding:4px 0;transition:color .2s}
.footer-col a:hover{color:var(--primary)}
.footer-col p{font-size:13px;color:var(--text-3);padding:4px 0;margin:0}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding:18px 0;text-align:center;font-size:13px;color:var(--text-3)}
/* sticky bar */
.sticky-bar{position:fixed;bottom:0;left:0;right:0;z-index:80;background:rgba(6,11,22,.88);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border-top:1px solid rgba(46,107,255,.5);box-shadow:0 -6px 30px rgba(46,107,255,.12);transform:translateY(100%);transition:transform .4s ease}
.sticky-bar.visible{transform:translateY(0)}
.sticky-inner{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}
.sticky-bar span{font-size:14px;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sticky-bar .btn{height:40px;padding:0 18px;font-size:13px}
body{padding-bottom:60px}
/* responsive */
@media (max-width:1023px){
  .header-inner{height:64px}
  .site-header.scrolled .header-inner{height:60px}
  .main-nav{position:fixed;top:100px;left:16px;right:16px;flex-direction:column;align-items:flex-start;background:rgba(5,9,18,.97);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid var(--stroke);border-radius:14px;padding:16px;gap:4px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transform:translateY(-12px);transition:all .3s ease;z-index:70}
  .main-nav.open{opacity:1;pointer-events:auto;transform:translateY(0)}
  .nav-link{display:flex;align-items:center;height:44px;width:100%;font-size:16px;padding:0 8px}
  .nav-link.active::after{display:none}
  .nav-link.active{font-weight:700}
  .nav-cta{display:flex;margin-top:8px;width:100%;justify-content:center}
  .nav-toggle{display:flex}
  .topbar-tag{display:none}
  .article-hero h1{font-size:32px}
}
@media (max-width:639px){
  .topbar-links .topbar-link:nth-child(2){display:none}
  .brand-name{font-size:17px}
  .container{padding-left:16px;padding-right:16px}
  .article-hero{padding:44px 0 36px}
  .article-hero h1{font-size:28px}
  .article-wrap{padding:36px 16px 16px}
  .section-head h2{font-size:24px}
  .faq-section,.related-section,.cta-band{padding-top:56px;padding-bottom:56px}
  .cta-band h2{font-size:24px}
  .sticky-inner{height:56px}
  .sticky-bar span{font-size:13px}
  body{padding-bottom:56px}
  .related-card img{height:120px}
}

/* roulang page: category3 */
:root{
--bg:#060B16;--bg-soft:#0B1220;--glass:rgba(255,255,255,0.05);--glass-strong:rgba(255,255,255,0.09);
--stroke:rgba(255,255,255,0.10);--stroke-light:rgba(255,255,255,0.16);
--primary:#2E6BFF;--primary-deep:#174ED8;--cyan:#19C6FF;--accent:#D6FF3D;--danger:#FF6B5E;
--text:#F2F6FC;--text-2:#A6B3C6;--text-3:#65748C;
--grad:linear-gradient(120deg,#2E6BFF,#19C6FF);
--radius:14px;--radius-lg:20px;--radius-round:999px;
--shadow:0 12px 32px rgba(2,6,16,0.45);--glow:0 8px 30px rgba(46,107,255,0.45);
--container-w:1200px;--space:96px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
background:var(--bg);color:var(--text);line-height:1.75;font-size:16px;
-webkit-font-smoothing:antialiased;
}
a{color:var(--cyan);text-decoration:none;transition:color .3s ease}
a:hover{color:#fff}
img{max-width:100%;display:block;border-radius:var(--radius)}
button{font-family:inherit}
ul{list-style:none}
h1,h2,h3,h4{line-height:1.25;font-weight:700}

.container{max-width:var(--container-w);margin:0 auto;padding:0 24px}
.grid-x{max-width:100%}
.cell{padding:0}

/* ===== 顶部信息条 ===== */
.top-bar{
background:rgba(4,8,16,0.85);border-bottom:1px solid rgba(255,255,255,0.08);
height:36px;display:flex;align-items:center;font-size:12px;color:var(--text-2);
}
.top-bar .container{display:flex;justify-content:space-between;align-items:center}
.top-bar .domain{color:var(--text-3);font-family:"DIN Alternate","Barlow Condensed",monospace}
.top-bar .top-links{display:flex;gap:16px}
.top-bar .top-links a{color:var(--text-2);font-size:12px;transition:color .2s}
.top-bar .top-links a:hover{color:var(--cyan)}

/* ===== 主导航 ===== */
.site-header{
position:sticky;top:0;z-index:100;height:72px;display:flex;align-items:center;
background:rgba(5,9,18,0.55);transition:all .35s ease;
}
.site-header.scrolled{
background:rgba(5,9,18,0.72);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
height:60px;border-bottom:1px solid var(--stroke);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;width:100%;gap:24px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-mark{width:36px;height:36px;flex-shrink:0}
.brand-name{font-size:20px;font-weight:700;letter-spacing:-0.01em;color:var(--text);white-space:nowrap}
.brand-name:hover{color:var(--text)}
.main-nav{display:flex;align-items:center;gap:6px;flex:1;justify-content:flex-end}
.main-nav .nav-link{
position:relative;display:inline-flex;align-items:center;padding:10px 14px;border-radius:10px;
color:var(--text-2);font-size:15px;letter-spacing:0.02em;font-weight:500;
transition:color .25s,background .25s;
}
.main-nav .nav-link:hover{color:var(--text);background:var(--glass)}
.main-nav .nav-link.active{
color:#fff;background:rgba(46,107,255,0.12);
}
.main-nav .nav-link.active::after{
content:'';position:absolute;left:14px;right:14px;bottom:4px;height:2px;border-radius:2px;
background:var(--grad);box-shadow:0 0 12px rgba(25,198,255,0.7);
}
.nav-cta{margin-left:10px;flex-shrink:0}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:transparent;border:0;cursor:pointer;padding:10px}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--text);border-radius:2px;transition:.3s}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== 按钮系统 ===== */
.btn{
display:inline-flex;align-items:center;justify-content:center;gap:8px;
height:44px;padding:0 24px;border-radius:12px;border:1px solid transparent;
font-size:14px;font-weight:600;letter-spacing:0.02em;cursor:pointer;
transition:all .3s ease;white-space:nowrap;
}
.btn:focus-visible{outline:2px solid #fff;outline-offset:2px}
.btn-primary{
background:var(--grad);color:#fff;border:none;
}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-2px);box-shadow:var(--glow);color:#fff}
.btn-primary:active{transform:translateY(0);filter:brightness(0.95)}
.btn-outline{
background:var(--glass);color:var(--text);border:1px solid var(--stroke);
backdrop-filter:blur(6px);
}
.btn-outline:hover{border-color:var(--primary);background:rgba(46,107,255,0.1);color:#fff}
.btn-outline:active{transform:scale(0.98)}
.btn-accent{
background:var(--accent);color:#0b1220;border:none;font-weight:700;
}
.btn-accent:hover{box-shadow:0 0 24px rgba(214,255,61,0.5);transform:translateY(-2px);color:#0b1220}
.btn-sm{height:38px;padding:0 18px;font-size:13px}
.btn-lg{height:52px;padding:0 36px;font-size:16px}
.btn-block{width:100%}

/* ===== 通用板块 ===== */
.section{padding:var(--space) 0}
.section-head{text-align:center;margin-bottom:44px}
.section-head .section-eyebrow{
display:inline-flex;align-items:center;gap:6px;font-size:13px;letter-spacing:0.06em;
color:var(--accent);background:rgba(214,255,61,0.08);border:1px solid rgba(214,255,61,0.15);
padding:6px 16px;border-radius:999px;margin-bottom:16px;
}
.section-head h2{font-size:36px;font-weight:700;letter-spacing:-0.01em}
.section-head p{color:var(--text-2);font-size:15px;max-width:640px;margin:12px auto 0}

/* ===== 分类页头 ===== */
.category-hero{
min-height:54vh;display:flex;align-items:center;position:relative;overflow:hidden;
padding:80px 0;
}
.category-hero .hero-bg{
position:absolute;inset:0;background-image:url('/assets/images/backpic/back-1.png');
background-size:cover;background-position:center;opacity:0.35;
}
.category-hero::before{
content:'';position:absolute;inset:0;
background:linear-gradient(90deg,rgba(6,11,22,0.96) 0%,rgba(6,11,22,0.75) 55%,rgba(6,11,22,0.4) 100%);
z-index:1;
}
.category-hero::after{
content:'';position:absolute;top:0;right:0;width:360px;height:360px;
background:var(--grad);filter:blur(140px);opacity:0.15;z-index:0;
}
.category-hero .container{position:relative;z-index:2}
.hero-breadcrumb{
display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:18px;
}
.hero-breadcrumb a{color:var(--text-3)}
.hero-breadcrumb a:hover{color:var(--cyan)}
.hero-breadcrumb .sep{color:var(--text-3);opacity:0.5}
.category-hero h1{
font-size:52px;font-weight:800;letter-spacing:-0.01em;line-height:1.2;
max-width:820px;margin-bottom:18px;
}
.category-hero .hero-sub{
font-size:17px;color:var(--text-2);max-width:620px;line-height:1.8;
}
.category-hero .hero-meta{
display:flex;gap:12px;margin-top:28px;flex-wrap:wrap;
}
.category-hero .hero-btn{min-width:170px}
.category-hero .hero-img{
background:var(--glass);border:1px solid var(--stroke);border-radius:20px;
padding:16px;backdrop-filter:blur(8px);box-shadow:var(--shadow);
animation:floatY 6s ease-in-out infinite;
}
.category-hero .hero-img img{border-radius:12px}
@keyframes floatY{
0%,100%{transform:translateY(0)}
50%{transform:translateY(-10px)}
}

/* ===== 分类说明区 ===== */
.intro-section{
background:var(--bg-soft);padding:var(--space) 0;border-top:1px solid var(--stroke);border-bottom:1px solid var(--stroke);
}
.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.intro-media{position:relative}
.intro-media img{border-radius:20px;box-shadow:var(--shadow)}
.intro-media::after{
content:'';position:absolute;inset:-16px;border:1px dashed rgba(46,107,255,0.3);
border-radius:24px;z-index:-1;
}
.intro-content .intro-eyebrow{
display:inline-flex;align-items:center;gap:6px;font-size:13px;letter-spacing:0.06em;
color:var(--accent);background:rgba(214,255,61,0.08);border:1px solid rgba(214,255,61,0.15);
padding:6px 16px;border-radius:999px;margin-bottom:16px;
}
.intro-content h2{font-size:32px;margin-bottom:14px}
.intro-content p.intro-desc{color:var(--text-2);font-size:15px;margin-bottom:24px}
.check-list li{
display:flex;gap:12px;padding:11px 14px;border-radius:12px;margin-bottom:8px;
background:var(--glass);border:1px solid var(--stroke);align-items:flex-start;
transition:border-color .3s,background .3s;
}
.check-list li:hover{border-color:rgba(46,107,255,0.5);background:var(--glass-strong)}
.check-list li .check-icon{
flex-shrink:0;width:22px;height:22px;border-radius:50%;background:rgba(46,107,255,0.15);
display:flex;align-items:center;justify-content:center;color:var(--cyan);font-size:12px;margin-top:3px;
}
.check-list li p{font-size:14px;color:var(--text);line-height:1.65}
.check-list li .title{font-weight:600;color:var(--text);font-size:15px}
.check-list li .desc{font-size:13px;color:var(--text-3);margin-top:2px}

/* ===== 内容卡片区 ===== */
.cards-section{padding:var(--space) 0}
.cards-wrap{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:24px}
.content-card{
background:var(--glass);border:1px solid var(--stroke);border-radius:var(--radius-lg);
padding:32px 28px;transition:transform .3s,box-shadow .3s,border-color .3s;
position:relative;overflow:hidden;
}
.content-card::before{
content:'';position:absolute;top:0;left:0;width:100%;height:3px;
background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .4s;
}
.content-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(46,107,255,0.4)}
.content-card:hover::before{transform:scaleX(1)}
.card-icon{
width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;
background:rgba(46,107,255,0.12);border:1px solid rgba(46,107,255,0.3);margin-bottom:18px;
}
.card-icon svg{width:28px;height:28px}
.content-card h3{font-size:21px;font-weight:700;margin-bottom:10px}
.content-card p.card-text{color:var(--text-2);font-size:14px;line-height:1.75;margin-bottom:18px}
.content-card a.detail-link{
display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--cyan);
transition:gap .3s;
}
.content-card a.detail-link:hover{gap:10px;color:#fff}
.cards-wide{
grid-column:1/-1;display:grid;grid-template-columns:1fr 1.2fr;gap:24px;align-items:center;
background:linear-gradient(120deg,rgba(46,107,255,0.12),rgba(25,198,255,0.06));
border:1px solid rgba(46,107,255,0.35);
}
.cards-wide .card-icon{margin-bottom:0}
.cards-feature-list li{
display:flex;gap:10px;align-items:center;padding:7px 0;font-size:14px;color:var(--text-2);
}
.cards-feature-list li::before{
content:'✓';display:inline-flex;align-items:center;justify-content:center;
width:18px;height:18px;border-radius:50%;background:rgba(214,255,61,0.15);
color:var(--accent);font-size:11px;flex-shrink:0;
}

/* ===== FAQ ===== */
.faq-section{
background:var(--bg-soft);padding:var(--space) 0;border-top:1px solid var(--stroke);border-bottom:1px solid var(--stroke);
}
.faq-wrap{max-width:840px;margin:0 auto}
.accordion-item{
background:var(--glass);border:1px solid var(--stroke);border-radius:14px;
margin-bottom:12px;overflow:hidden;transition:border-color .3s,box-shadow .3s;
}
.accordion-item.is-active{border-color:rgba(46,107,255,0.5);box-shadow:0 0 20px rgba(46,107,255,0.15)}
.accordion-title{
display:flex;align-items:center;justify-content:space-between;gap:16px;
padding:18px 24px;font-size:15px;font-weight:600;color:var(--text);
cursor:pointer;transition:color .3s;background:transparent;
}
.accordion-title:hover{color:var(--cyan)}
.accordion-title::after{
content:'+';font-size:22px;font-weight:400;color:var(--text-3);
transition:transform .35s,color .3s;flex-shrink:0;
}
.accordion-item.is-active .accordion-title::after{
transform:rotate(45deg);color:var(--accent);
}
.accordion-content{
padding:0 24px 20px;color:var(--text-2);font-size:14px;line-height:1.8;
}
.accordion-content p{margin-bottom:6px}
.accordion-content p:last-child{margin-bottom:0}

/* ===== CTA 带 ===== */
.cta-section{padding:96px 0;position:relative;overflow:hidden}
.cta-section::before{
content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-2.png');
background-size:cover;background-position:center;opacity:0.12;
}
.cta-section::after{
content:'';position:absolute;right:-80px;top:50%;transform:translateY(-50%);
width:320px;height:320px;background:var(--grad);filter:blur(130px);opacity:0.12;
}
.cta-panel{
position:relative;z-index:2;max-width:960px;margin:0 auto;text-align:center;
background:rgba(255,255,255,0.03);border:1px solid rgba(46,107,255,0.3);border-radius:24px;
padding:56px 48px;backdrop-filter:blur(10px);
}
.cta-panel h2{font-size:36px;font-weight:800;margin-bottom:14px}
.cta-panel p{font-size:16px;color:var(--text-2);margin-bottom:28px}
.cta-btn-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ===== 页脚 ===== */
.site-footer{
background:#04070F;border-top:1px solid rgba(46,107,255,0.2);padding-top:56px;
}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px;padding-bottom:40px}
.footer-brand p{font-size:14px;color:var(--text-3);margin:16px 0;max-width:300px}
.footer-domain{
font-size:13px;color:var(--text-3);font-family:"DIN Alternate","Barlow Condensed",monospace;
border:1px solid var(--stroke);padding:4px 12px;border-radius:6px;display:inline-block;
}
.footer-col h4{font-size:15px;font-weight:700;color:var(--text);margin-bottom:16px}
.footer-col a{display:block;font-size:14px;color:var(--text-3);padding:5px 0;transition:color .25s}
.footer-col a:hover{color:var(--cyan)}
.footer-col p{font-size:13px;color:var(--text-3);line-height:1.7;margin-bottom:4px}
.footer-bottom{
border-top:1px solid var(--stroke);text-align:center;padding:18px 0;font-size:13px;color:var(--text-3);
}

/* ===== 底部固定条 ===== */
.sticky-bar{
position:fixed;bottom:0;left:0;right:0;z-index:90;
height:60px;display:flex;align-items:center;
background:rgba(6,11,22,0.85);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
border-top:1px solid rgba(46,107,255,0.4);box-shadow:0 -4px 20px rgba(0,0,0,0.3);
transform:translateY(100%);transition:transform .35s ease;
}
.sticky-bar.visible{transform:translateY(0)}
.sticky-inner{display:flex;justify-content:space-between;align-items:center;width:100%}
.sticky-bar p{font-size:13px;color:var(--text-2)}
.sticky-bar .btn{flex-shrink:0}

/* ===== 响应式 ===== */
@media(max-width:1024px){
:root{--space:72px}
.header-inner{gap:12px}
.main-nav{
position:fixed;top:72px;left:0;right:0;background:rgba(5,9,18,0.96);
backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
flex-direction:column;align-items:stretch;padding:16px 24px 24px;
transform:translateY(-16px);opacity:0;visibility:hidden;transition:all .35s ease;
border-bottom:1px solid var(--stroke);
}
.main-nav.is-open{transform:translateY(0);opacity:1;visibility:visible}
.main-nav .nav-link{padding:14px 16px;font-size:16px;border-radius:12px}
.main-nav .nav-link.active::after{left:16px;right:auto;width:32px}
.nav-cta{margin:12px 0 0;width:100%}
.nav-toggle{display:flex}
.category-hero h1{font-size:38px}
.intro-grid{grid-template-columns:1fr;gap:36px}
.cards-wrap{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr 1fr;gap:24px}
}
@media(max-width:640px){
:root{--space:56px}
body{font-size:15px}
.site-header,.site-header.scrolled{height:60px}
.main-nav{top:60px}
.top-bar .top-links a:nth-child(2){display:none}
.category-hero{min-height:auto;padding:56px 0}
.category-hero h1{font-size:28px}
.category-hero .hero-sub{font-size:15px}
.section-head h2,.intro-content h2{font-size:26px}
.cta-panel{width:100%;max-width:100%;padding:36px 20px;border-radius:16px}
.cta-section::before{display:none}
.cta-panel h2{font-size:26px}
.cta-btn-row{flex-direction:column}
.btn-lg{width:100%}
.card-icon{width:48px;height:48px;border-radius:12px}
.card-icon svg{width:24px;height:24px}
.footer-grid{grid-template-columns:1fr;gap:24px}
.footer-brand{padding-bottom:8px}
.sticky-bar{height:56px}
.sticky-bar p{font-size:12px}
.sticky-bar .btn{padding:0 14px;font-size:13px;height:36px}
html,body{overflow-x:hidden}
}
@media(max-width:520px){
.cards-wide{grid-template-columns:1fr;display:grid}
.footer-grid{grid-template-columns:1fr}
.cards-wide .card-icon{margin-bottom:14px}
}

/* roulang page: category2 */
:root{
  --bg:#060B16;
  --bg-soft:#0B1220;
  --glass:rgba(255,255,255,0.05);
  --glass-strong:rgba(255,255,255,0.09);
  --stroke:rgba(255,255,255,0.10);
  --stroke-light:rgba(255,255,255,0.16);
  --primary:#2E6BFF;
  --primary-deep:#174ED8;
  --cyan:#19C6FF;
  --accent:#D6FF3D;
  --danger:#FF6B5E;
  --text:#F2F6FC;
  --text-2:#A6B3C6;
  --text-3:#65748C;
  --grad:linear-gradient(120deg,#2E6BFF,#19C6FF);
  --radius:14px;
  --radius-lg:20px;
  --radius-round:999px;
  --shadow:0 12px 32px rgba(2,6,16,0.45);
  --glow:0 8px 30px rgba(46,107,255,0.45);
  --blur:blur(18px);
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  padding-bottom:60px;
}
img{max-width:100%;height:auto;display:block;}
a{color:inherit;text-decoration:none;transition:color .25s ease,border-color .25s ease,background-color .25s ease,box-shadow .25s ease,transform .25s ease;}
ul,ol{list-style:none;margin:0;padding:0;}
p{margin:0;}
h1,h2,h3,h4,h5{margin:0;font-weight:700;line-height:1.25;}
button{font-family:inherit;cursor:pointer;border:none;background:none;padding:0;}

.container{max-width:1200px;margin:0 auto;padding-left:24px;padding-right:24px;}

/* ===== Topbar ===== */
.topbar{
  height:36px;
  background:rgba(4,8,16,0.85);
  border-bottom:1px solid rgba(255,255,255,0.08);
  display:flex;
  align-items:center;
  font-size:12px;
  color:var(--text-2);
}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;width:100%;}
.topbar-left{display:flex;gap:12px;align-items:center;}
.topbar-tag{
  color:var(--accent);
  border:1px solid rgba(214,255,61,0.35);
  padding:1px 8px;
  border-radius:999px;
  font-size:11px;
  letter-spacing:0.04em;
}
.topbar-right{display:flex;gap:18px;}
.topbar-right a{color:var(--text-2);}
.topbar-right a:hover{color:var(--primary);}

/* ===== Header / Nav ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  height:72px;
  display:flex;
  align-items:center;
  background:transparent;
  transition:background .35s ease,box-shadow .35s ease,height .35s ease,border-color .35s ease;
}
.site-header.scrolled{
  height:60px;
  background:rgba(5,9,18,0.72);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(255,255,255,0.08);
  box-shadow:0 8px 32px rgba(2,6,16,0.35);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;width:100%;}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{width:36px;height:36px;flex-shrink:0;}
.brand-name{font-size:20px;font-weight:700;letter-spacing:-0.01em;color:var(--text);white-space:nowrap;}

.main-nav{display:flex;align-items:center;gap:26px;}
.nav-link{
  font-size:15px;
  letter-spacing:0.02em;
  color:var(--text-2);
  position:relative;
  padding:6px 2px;
  background:none;
  border:none;
  cursor:pointer;
}
.nav-link:hover{color:var(--primary);}
.nav-link.active{color:var(--text);}
.nav-link.active::after{
  content:'';
  position:absolute;
  left:0;
  right:0;
  bottom:-2px;
  height:2px;
  background:var(--grad);
  border-radius:2px;
  box-shadow:0 0 12px rgba(46,107,255,0.6);
}
.nav-cta{height:40px;padding:0 20px;margin-left:6px;flex-shrink:0;}

.nav-toggle{
  display:none;
  width:44px;
  height:44px;
  background:var(--glass);
  border:1px solid var(--stroke);
  border-radius:10px;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  gap:5px;
  z-index:99;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text);border-radius:2px;transition:transform .3s ease,opacity .3s ease;}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 28px;
  border-radius:12px;
  font-size:15px;
  font-weight:600;
  letter-spacing:0.02em;
  transition:transform .25s ease,box-shadow .25s ease,filter .25s ease,background-color .25s ease,border-color .25s ease;
}
.btn:active{transform:scale(0.98);}
.btn:focus-visible{outline:2px solid #fff;outline-offset:3px;}
.btn-primary{background:var(--grad);color:#fff;}
.btn-primary:hover{filter:brightness(1.08);box-shadow:var(--glow);transform:translateY(-2px);}
.btn-primary:active{transform:translateY(0);filter:brightness(0.95);}
.btn-ghost{background:var(--glass);border:1px solid var(--stroke);color:var(--text);}
.btn-ghost:hover{border-color:var(--primary);background:rgba(46,107,255,0.1);color:var(--text);}
.btn-accent{background:var(--accent);color:#0A0F1A;box-shadow:0 6px 24px rgba(214,255,61,0.25);}
.btn-accent:hover{box-shadow:0 0 24px rgba(214,255,61,0.45),0 6px 24px rgba(214,255,61,0.25);transform:translateY(-2px);filter:brightness(1.05);}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}

/* ===== Sections ===== */
.section{padding:88px 0;}
.section-head{margin-bottom:40px;}
.section-head .tag{display:inline-block;margin-bottom:10px;}
.section-head h2{font-size:36px;font-weight:700;line-height:1.2;margin-bottom:10px;letter-spacing:-0.01em;}
.section-sub{color:var(--text-2);font-size:15px;max-width:640px;line-height:1.7;}
.section-head.text-center{text-align:center;}
.section-head.text-center .section-sub{margin-left:auto;margin-right:auto;}
.text-center{text-align:center;}

/* ===== Tags ===== */
.tag{
  display:inline-block;
  font-size:12px;
  letter-spacing:0.04em;
  padding:3px 10px;
  border-radius:6px;
  background:rgba(46,107,255,0.18);
  color:#7FA8FF;
}
.tag-hot{background:rgba(214,255,61,0.15);color:var(--accent);}

/* ===== Breadcrumb ===== */
.breadcrumb{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--text-3);
  margin-bottom:16px;
  flex-wrap:wrap;
}
.breadcrumb a{color:var(--text-2);}
.breadcrumb a:hover{color:var(--primary);}
.breadcrumb .sep{color:var(--text-3);}

/* ===== Category Hero ===== */
.cat-hero{
  position:relative;
  min-height:40vh;
  padding:72px 0 64px;
  overflow:hidden;
  background:
    radial-gradient(600px 300px at 80% 20%,rgba(46,107,255,0.18),transparent 60%),
    linear-gradient(180deg,var(--bg-soft),var(--bg));
  border-bottom:1px solid var(--stroke);
}
.cat-hero::before{
  content:'';
  position:absolute;
  inset:0;
  background-image:radial-gradient(rgba(255,255,255,0.06) 1px,transparent 1px);
  background-size:24px 24px;
  mask-image:linear-gradient(120deg,transparent 20%,#000 90%);
  -webkit-mask-image:linear-gradient(120deg,transparent 20%,#000 90%);
  pointer-events:none;
}
.cat-hero::after{
  content:'';
  position:absolute;
  top:0;
  right:0;
  width:46%;
  height:100%;
  background-image:radial-gradient(rgba(25,198,255,0.09) 1px,transparent 1px);
  background-size:18px 18px;
  mask-image:linear-gradient(135deg,transparent,#000);
  -webkit-mask-image:linear-gradient(135deg,transparent,#000);
  pointer-events:none;
}
.cat-hero .container{position:relative;z-index:1;}
.cat-hero h1{
  font-size:44px;
  font-weight:800;
  line-height:1.15;
  letter-spacing:-0.01em;
  margin-bottom:16px;
}
.cat-hero h1 .hero-accent{color:var(--cyan);}
.cat-hero-desc{
  color:var(--text-2);
  font-size:16px;
  max-width:520px;
  line-height:1.8;
  margin-bottom:28px;
}
.cat-hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
.cat-hero-visual{position:relative;}
.cat-hero-visual img{
  width:100%;
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
  border:1px solid var(--stroke);
}
.hero-float-card{
  position:absolute;
  left:-20px;
  bottom:24px;
  display:flex;
  align-items:center;
  gap:12px;
  padding:16px 20px;
  background:rgba(5,9,18,0.85);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(46,107,255,0.4);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.hero-float-card .num{
  font-size:26px;
  font-weight:800;
  font-family:"DIN Alternate","Barlow Condensed","Arial Narrow",sans-serif;
  color:var(--accent);
  line-height:1;
}
.hero-float-card .txt{font-size:13px;color:var(--text-2);line-height:1.4;}
.hero-float-card .txt strong{display:block;color:var(--text);}

/* ===== Category Intro ===== */
.cat-intro{
  position:relative;
  background-color:var(--bg-soft);
  border-top:1px solid var(--stroke);
}
.cat-intro::before{
  content:'';
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-2.png');
  background-size:cover;
  background-position:center;
  opacity:0.12;
  pointer-events:none;
}
.cat-intro .container{position:relative;z-index:1;}
.cat-intro .tag{display:inline-block;margin-bottom:12px;}
.cat-intro h2{font-size:34px;font-weight:700;line-height:1.25;margin-bottom:12px;letter-spacing:-0.01em;}
.cat-intro .section-sub{margin-bottom:22px;}
.cat-intro .intro-media img{border-radius:var(--radius-lg);box-shadow:var(--shadow);border:1px solid var(--stroke);}
.point-list{display:grid;gap:14px;}
.point-list li{
  display:flex;
  gap:12px;
  align-items:flex-start;
  font-size:15px;
  color:var(--text-2);
  line-height:1.7;
}
.point-list .check{
  width:20px;
  height:20px;
  border-radius:50%;
  background:rgba(214,255,61,0.12);
  border:1px solid rgba(214,255,61,0.45);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-size:11px;
  color:var(--accent);
  flex-shrink:0;
  margin-top:5px;
}

/* ===== Category Cards ===== */
.cat-cards{background:var(--bg);}
.cat-feature-card{
  display:flex;
  flex-direction:column;
  height:100%;
  border-radius:var(--radius-lg);
  overflow:hidden;
  background:var(--glass);
  border:1px solid var(--stroke);
  transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.cat-feature-card:hover{
  transform:translateY(-4px);
  border-color:rgba(46,107,255,0.5);
  box-shadow:var(--shadow),0 0 30px rgba(46,107,255,0.25);
}
.cat-feature-card img{width:100%;height:220px;object-fit:cover;border:none;}
.cat-feature-body{padding:26px;display:flex;flex-direction:column;flex:1;}
.cat-feature-body .tag{align-self:flex-start;}
.cat-feature-body h3{font-size:22px;font-weight:600;margin:12px 0 10px;}
.cat-feature-body p{color:var(--text-2);font-size:15px;line-height:1.75;}
.cat-feature-body .text-link{margin-top:auto;padding-top:14px;}

.cat-mini-cards{display:flex;flex-direction:column;gap:20px;height:100%;}
.cat-mini-card{
  background:var(--bg-soft);
  border:1px solid var(--stroke);
  border-left:3px solid var(--primary);
  border-radius:var(--radius);
  padding:22px 24px;
  transition:background .3s ease,transform .3s ease,border-left-color .3s ease;
  flex:1;
  display:flex;
  flex-direction:column;
}
.cat-mini-card:hover{
  background:var(--glass-strong);
  transform:translateX(4px);
  border-left-color:var(--accent);
}
.cat-mini-icon{margin-bottom:10px;}
.cat-mini-card h3{font-size:18px;font-weight:600;margin-bottom:8px;}
.cat-mini-card p{font-size:14px;color:var(--text-2);line-height:1.7;}
.cat-mini-card .text-link{margin-top:auto;padding-top:12px;}

/* ===== Text link ===== */
.text-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--primary);
  font-size:14px;
  font-weight:600;
}
.text-link:hover{color:var(--cyan);}
.text-link .arrow{transition:transform .25s ease;}
.text-link:hover .arrow{transform:translateX(4px);}

/* ===== FAQ ===== */
.faq-section{position:relative;background:var(--bg);overflow:hidden;}
.faq-section::before{
  content:'';
  position:absolute;
  inset:0;
  background:radial-gradient(500px 260px at 85% 10%,rgba(46,107,255,0.1),transparent);
  pointer-events:none;
}
.faq-section .container{position:relative;z-index:1;}
.faq-list{display:grid;gap:12px;max-width:860px;margin:0 auto;}
.accordion{background:transparent;}
.accordion-item{
  background:var(--glass);
  border:1px solid var(--stroke);
  border-radius:var(--radius);
  overflow:hidden;
  transition:border-color .3s ease,box-shadow .3s ease;
}
.accordion-item.is-active{
  border-color:rgba(46,107,255,0.6);
  box-shadow:0 0 20px rgba(46,107,255,0.15);
}
.accordion-item + .accordion-item{margin-top:0;}
.accordion-title{
  position:relative;
  display:block;
  padding:18px 48px 18px 24px;
  font-size:16px;
  font-weight:600;
  color:var(--text);
  line-height:1.4;
  border:none;
  border-bottom:none;
  background:transparent;
}
.accordion-title:hover{color:var(--cyan);background:transparent;}
.accordion-title::before{display:none;}
.accordion-title::after{
  content:'+';
  position:absolute;
  right:20px;
  top:50%;
  transform:translateY(-50%);
  width:24px;
  height:24px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:6px;
  background:rgba(46,107,255,0.15);
  color:var(--primary);
  font-size:18px;
  line-height:1;
  transition:transform .3s ease,background .3s ease;
}
.accordion-item.is-active > .accordion-title::after{
  transform:translateY(-50%) rotate(45deg);
  background:rgba(46,107,255,0.3);
  color:var(--cyan);
}
.accordion-content{
  padding:0 24px 20px;
  border:none;
  background:transparent;
  color:var(--text-2);
  font-size:14px;
  line-height:1.7;
}
.accordion-item:first-child > :first-child,
.accordion-item:last-child > :last-child,
.accordion-item:first-child > :last-child{border-radius:0;}

/* ===== CTA Band ===== */
.cta-band{padding:104px 0;background:var(--bg-soft);border-top:1px solid var(--stroke);}
.cta-panel{
  position:relative;
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  padding:56px 40px;
  border-radius:var(--radius-lg);
  background:
    radial-gradient(400px 200px at 20% 0%,rgba(46,107,255,0.25),transparent 60%),
    radial-gradient(400px 200px at 80% 100%,rgba(25,198,255,0.15),transparent 60%),
    rgba(255,255,255,0.04);
  border:1px solid rgba(46,107,255,0.4);
  overflow:hidden;
}
.cta-panel::before{
  content:'';
  position:absolute;
  top:0;
  left:10%;
  right:10%;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(46,107,255,0.7),transparent);
}
.cta-panel h2{font-size:34px;font-weight:800;margin-bottom:12px;letter-spacing:-0.01em;}
.cta-panel p{color:var(--text-2);font-size:15px;margin-bottom:30px;max-width:560px;}
.cta-panel .btn-accent{height:52px;padding:0 36px;font-size:16px;}

/* ===== Footer ===== */
.site-footer{
  background:#04070F;
  border-top:1px solid rgba(46,107,255,0.35);
  padding-top:64px;
}
.footer-grid{row-gap:36px;padding-bottom:40px;}
.footer-brand .brand-name{font-size:20px;}
.footer-brand p{color:var(--text-3);font-size:14px;max-width:280px;line-height:1.7;margin:16px 0;}
.footer-domain{
  display:inline-block;
  font-size:13px;
  color:var(--text-2);
  border:1px solid var(--stroke);
  padding:2px 10px;
  border-radius:999px;
}
.footer-col{display:flex;flex-direction:column;gap:10px;}
.footer-col h4{font-size:15px;color:var(--text);font-weight:600;margin-bottom:8px;}
.footer-col a{display:inline-block;color:var(--text-3);font-size:14px;}
.footer-col a:hover{color:var(--primary);}
.footer-col p{color:var(--text-3);font-size:14px;line-height:1.7;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.06);
  padding:20px 0;
  text-align:center;
  font-size:13px;
  color:var(--text-3);
}

/* ===== Fixed Bar ===== */
.fixed-bar{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  height:60px;
  background:rgba(6,11,22,0.85);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  border-top:1px solid rgba(46,107,255,0.5);
  transform:translateY(100%);
  opacity:0;
  transition:transform .4s ease,opacity .4s ease;
  z-index:90;
}
.fixed-bar.visible{transform:translateY(0);opacity:1;}
.fixed-bar-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:16px;}
.fixed-bar span{font-size:14px;color:var(--text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}

/* ===== Responsive ===== */
@media (max-width:1023px){
  .section{padding:72px 0;}
  .main-nav{
    position:fixed;
    top:0;
    right:0;
    height:100vh;
    height:100dvh;
    width:320px;
    max-width:85vw;
    background:rgba(5,9,18,0.96);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    flex-direction:column;
    align-items:stretch;
    gap:4px;
    padding:96px 32px 40px;
    transform:translateX(100%);
    transition:transform .35s ease;
    box-shadow:-20px 0 60px rgba(0,0,0,0.5);
    border-left:1px solid var(--stroke);
    z-index:98;
    overflow-y:auto;
  }
  .main-nav.open{transform:translateX(0);}
  .nav-link{
    font-size:17px;
    padding:12px 0;
    width:100%;
    border-bottom:1px solid rgba(255,255,255,0.06);
  }
  .nav-link.active::after{left:0;right:auto;width:3px;height:100%;top:0;bottom:auto;border-radius:0;}
  .nav-cta{margin-top:20px;width:100%;height:48px;}
  .nav-toggle{display:inline-flex;}
  body.menu-open{overflow:hidden;}
  .cat-hero{padding:56px 0 48px;}
  .cat-hero h1{font-size:36px;}
  .cat-hero-visual{margin-top:36px;}
  .hero-float-card{left:16px;bottom:16px;}
  .cat-intro h2{font-size:30px;}
  .cta-band{padding:80px 0;}
}
@media (max-width:639px){
  body{padding-bottom:56px;}
  .section{padding:56px 0;}
  .section-head{margin-bottom:28px;}
  .section-head h2{font-size:26px;}
  .site-header{height:60px;}
  .site-header.scrolled{height:60px;}
  .topbar-right{gap:12px;}
  .topbar-tag{display:none;}
  .topbar-right a:nth-child(2){display:none;}
  .cat-hero{min-height:auto;padding:44px 0 40px;}
  .cat-hero h1{font-size:30px;}
  .cat-hero-desc{font-size:15px;}
  .cat-hero-actions .btn{width:100%;}
  .cat-hero-actions{gap:10px;}
  .hero-float-card{padding:12px 16px;bottom:12px;left:12px;}
  .cat-intro h2{font-size:26px;}
  .cat-intro .section-sub{font-size:14px;}
  .point-list li{font-size:14px;}
  .cat-feature-body{padding:20px;}
  .cat-feature-body h3{font-size:20px;}
  .cat-mini-card{padding:18px 20px;}
  .cat-mini-card h3{font-size:17px;}
  .fixed-bar{height:56px;}
  .fixed-bar span{font-size:13px;max-width:60%;}
  .cta-band{padding:56px 0;}
  .cta-panel{padding:40px 24px;}
  .cta-panel h2{font-size:26px;}
  .cta-panel .btn-accent{width:100%;}
  .footer-bottom{padding:16px 0;}
  .footer-grid{padding-bottom:24px;}
}