/* roulang page: index */
:root {
      --main-dark: #0A0E17;
      --accent-magenta: #E94057;
      --accent-magenta-deeper: #C6283A;
      --accent-cyan: #00C2FF;
      --bg-light: #F5F5F7;
      --card-bg: #FFFFFF;
      --dark-card-bg: #141A24;
      --text-primary: #1C1C1E;
      --text-secondary: #636366;
      --text-on-dark: #FFFFFF;
      --border-light: rgba(0,0,0,0.04);
      --border-dark: rgba(255,255,255,0.08);
      --border-card: rgba(0,0,0,0.06);
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.10);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
      --font-mono: "SF Mono", "Consolas", "Menlo", "Noto Sans Mono", monospace;
      --header-height: 72px;
      --container-max: 1280px;
      --gap-grid: 24px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--header-height);
    }

    body {
      font-family: var(--font-sans);
      background-color: #FFFFFF;
      color: var(--text-primary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    .container {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航栏 */
    .nav-site {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 48px;
      z-index: 100;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
      background: transparent;
      backdrop-filter: blur(0px);
      border-bottom: 1px solid transparent;
    }

    .nav-site.scrolled {
      background: rgba(10, 14, 23, 0.92);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-dark);
      box-shadow: 0 4px 20px rgba(0,0,0,0.25);
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.02em;
      color: var(--text-on-dark);
      text-shadow: 0 1px 4px rgba(0,0,0,0.5);
      transition: text-shadow 0.2s;
    }
    .nav-site.scrolled .logo-area {
      text-shadow: none;
    }

    .logo-dot {
      width: 10px;
      height: 10px;
      background: var(--accent-magenta);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 8px var(--accent-magenta);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 550;
      color: rgba(255,255,255,0.9);
      font-size: 0.95rem;
      letter-spacing: 0.3px;
    }

    .nav-links a {
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-magenta);
      transition: width 0.25s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--accent-magenta);
      color: #fff;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 650;
      font-size: 0.95rem;
      cursor: pointer;
      transition: background 0.25s, box-shadow 0.25s;
      margin-left: 8px;
    }
    .nav-cta:hover {
      background: var(--accent-magenta-deeper);
      box-shadow: 0 0 12px var(--accent-magenta);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 110;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: #fff;
      border-radius: 4px;
      transition: all 0.3s;
    }
    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero-section {
      background-color: var(--main-dark);
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: var(--header-height);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left {
      color: #fff;
    }
    .hero-eyebrow {
      color: var(--accent-cyan);
      font-size: 0.9rem;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      margin-bottom: 20px;
      font-weight: 500;
    }
    h1 {
      font-size: clamp(2.4rem, 5vw, 3.8rem);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 1.2rem;
    }
    .hero-desc {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.75);
      margin-bottom: 2.2rem;
      max-width: 85%;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 32px;
    }
    .btn-primary {
      background: var(--accent-magenta);
      color: #fff;
      font-weight: 650;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: none;
      transition: all 0.25s;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover { background: #C6283A; box-shadow: 0 0 20px rgba(233,64,87,0.45); }
    .btn-secondary {
      border: 2px solid var(--accent-magenta);
      color: var(--accent-magenta);
      background: transparent;
      font-weight: 650;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: 0.25s;
    }
    .btn-secondary:hover { background: rgba(233,64,87,0.1); }

    .hero-stats {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .stat-badge {
      font-family: var(--font-mono);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--accent-magenta);
      line-height: 1.2;
    }
    .stat-badge small {
      display: block;
      font-family: var(--font-sans);
      font-size: 0.75rem;
      color: rgba(255,255,255,0.65);
      font-weight: 500;
    }

    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
    }
    .hero-img {
      border-radius: 24px;
      overflow: hidden;
      transform: rotate(-2deg);
      box-shadow: 0 30px 50px rgba(0,0,0,0.7);
      width: 100%;
      background: #1A1E29;
    }
    .hero-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
      display: block;
    }

    section {
      padding: 90px 0;
    }
    .section-header {
      margin-bottom: 60px;
    }
    h2 {
      font-size: 2.5rem;
      font-weight: 750;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 12px;
    }
    h2::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--accent-magenta);
      border-radius: 2px;
    }

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

    /* 优势错位 */
    .advantage-row {
      display: flex;
      align-items: center;
      gap: 80px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }
    .advantage-row.reverse {
      flex-direction: row-reverse;
    }
    .adv-img {
      flex: 1 1 45%;
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
      background: #d0d3db;
      min-height: 320px;
    }
    .adv-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .adv-img:hover img { transform: scale(1.03); }
    .adv-text {
      flex: 1 1 45%;
    }
    .adv-number {
      font-size: 5rem;
      font-weight: 800;
      color: rgba(0,0,0,0.08);
      line-height: 1;
      margin-bottom: 10px;
      font-family: var(--font-mono);
    }
    h3 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    /* 网格 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .grid-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
    }
    .grid-item.tall {
      grid-row: span 2;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .grid-big-number {
      font-family: var(--font-mono);
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--accent-magenta);
    }
    .duo-icons span { margin-right: 8px; color: var(--accent-cyan); }

    /* 瀑布 */
    .masonry {
      columns: 3;
      column-gap: 20px;
    }
    .masonry-card {
      background: #fff;
      border-radius: var(--radius-card);
      margin-bottom: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
      break-inside: avoid;
    }
    .masonry-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-card-hover); }
    .masonry-img { height: 200px; background: #ccc; overflow: hidden; }
    .masonry-img img { width: 100%; height: 100%; object-fit: cover; transition: 0.3s; }
    .masonry-card:hover .masonry-img img { transform: scale(1.05); }
    .masonry-content { padding: 22px; }

    .compare-table {
      display: flex;
      border-radius: var(--radius-card);
      overflow: hidden;
      background: #fff;
    }
    .compare-col { flex: 1; padding: 30px; }
    .compare-col:first-child { background: #fafafa; border-left: 4px solid var(--accent-magenta); }

    .faq-item {
      background: #fff;
      border-radius: 12px;
      margin-bottom: 12px;
      border: 1px solid var(--border-card);
    }
    .faq-question {
      padding: 24px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .cta-banner {
      background: var(--main-dark);
      color: #fff;
      text-align: center;
      padding: 90px 20px;
    }

    footer {
      background: #0A0E17;
      color: #ccc;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .dashboard-grid { grid-template-columns: 1fr 1fr; }
      .masonry { columns: 2; }
      .compare-flex { flex-direction: column; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .masonry { columns: 1; }
      .advantage-row { flex-direction: column; gap: 40px; }
    }