/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --graphite: #1A1F3A;
      --cyan: #00F0FF;
      --orange: #FF4D00;
      --gold: #FFD700;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8D0;
      --text-muted: #7B8299;
      --border-glow: rgba(0, 240, 255, 0.2);
      --shadow-cyan: 0 8px 32px rgba(0, 240, 255, 0.25);
      --shadow-orange: 0 8px 32px rgba(255, 77, 0, 0.4);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --font-sans: "Inter", -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-bounce: cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-blue);
      color: var(--text-secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 网格背景纹理 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: 0;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 40px);
      max-width: 1200px;
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 60px;
      padding: 12px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 100;
      border: 1px solid rgba(0, 240, 255, 0.15);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
      transition: all 0.3s ease;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.8rem;
      text-decoration: none;
      letter-spacing: -0.5px;
    }

    .logo-icon {
      font-size: 2rem;
      color: var(--cyan);
      filter: drop-shadow(0 0 8px rgba(0,240,255,0.7));
    }

    .logo .youku {
      color: var(--cyan);
    }
    .logo .tiyu {
      color: white;
    }

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

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan);
      box-shadow: 0 0 12px var(--cyan);
      transition: width 0.3s var(--transition-bounce);
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      transition: 0.3s;
      display: block;
    }

    /* 英雄区 */
    #hero {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding: 140px 0 80px;
      overflow: hidden;
      z-index: 2;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 1.2;
    }

    .hero-right {
      flex: 1;
      position: relative;
      height: 500px;
    }

    .hero-badge {
      display: inline-block;
      background: rgba(0, 240, 255, 0.1);
      border: 1px solid var(--border-glow);
      color: var(--cyan);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 28px;
      backdrop-filter: blur(8px);
    }

    h1 {
      font-size: 4rem;
      font-weight: 800;
      line-height: 1.1;
      color: white;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }

    .h1-highlight {
      background: linear-gradient(135deg, #00F0FF 0%, #FFD700 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      text-shadow: 0 0 30px rgba(0,240,255,0.5);
    }

    .hero-desc {
      font-size: 1.25rem;
      color: var(--text-secondary);
      max-width: 600px;
      margin-bottom: 40px;
      line-height: 1.7;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--orange);
      color: white;
      border: none;
      padding: 16px 40px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1.1rem;
      letter-spacing: 2px;
      cursor: pointer;
      transition: all 0.3s var(--transition-bounce);
      box-shadow: 0 4px 15px rgba(255, 77, 0, 0.5);
      text-transform: uppercase;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary:hover {
      background: #ff6520;
      box-shadow: 0 0 30px rgba(255, 77, 0, 0.8);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      color: var(--cyan);
      border: 2px solid var(--cyan);
      padding: 16px 40px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1.1rem;
      letter-spacing: 2px;
      cursor: pointer;
      transition: all 0.3s;
      text-transform: uppercase;
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: white;
      color: white;
      box-shadow: 0 0 20px rgba(0,240,255,0.4);
    }

    .hero-visual {
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      position: relative;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      border: 1px solid rgba(255,255,255,0.1);
    }

    .glass-float {
      position: absolute;
      bottom: 30px;
      left: 30px;
      background: rgba(10,14,39,0.7);
      backdrop-filter: blur(16px);
      padding: 20px 24px;
      border-radius: 20px;
      border: 1px solid rgba(0,240,255,0.25);
      color: white;
      font-weight: 600;
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
      z-index: 2;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .title-line {
      width: 6px;
      height: 40px;
      background: var(--cyan);
      border-radius: 4px;
      box-shadow: 0 0 20px var(--cyan);
    }

    /* 功能非对称 */
    .feature-asym {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    .card {
      background: var(--graphite);
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid rgba(0,240,255,0.15);
      transition: all 0.3s ease;
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-cyan);
      border-color: rgba(0,240,255,0.4);
    }

    .card-main {
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 400px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      color: white;
    }

    .card-main .overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(10,14,39,0.9) 0%, transparent 70%);
      border-radius: var(--radius-md);
    }

    .card-content {
      position: relative;
      z-index: 2;
    }

    .card h3 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    /* 场景卡片 */
    .scenario-grid {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }

    .scenario-card {
      min-width: 280px;
      flex: 0 0 30%;
      border-radius: 24px;
      height: 360px;
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
      transition: transform 0.4s;
      scroll-snap-align: start;
      border: 1px solid rgba(255,255,255,0.1);
    }

    .scenario-card:hover {
      transform: scale(1.02);
    }

    .scenario-card .scenario-title {
      position: absolute;
      bottom: 20px;
      left: 20px;
      color: white;
      font-weight: 700;
      font-size: 1.5rem;
      z-index: 2;
    }

    /* 案例 */
    .counter-grid {
      display: flex;
      justify-content: space-around;
      margin: 40px 0;
    }
    .counter-item {
      text-align: center;
    }
    .counter-num {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--orange);
      font-family: 'Inter', monospace;
    }
    .logo-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
      filter: grayscale(1);
      opacity: 0.7;
      transition: 0.3s;
    }
    .logo-wall img {
      height: 40px;
    }
    .logo-wall:hover {
      filter: grayscale(0);
      opacity: 1;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: var(--graphite);
      border-radius: 16px;
      padding: 20px;
      cursor: pointer;
      border: 1px solid transparent;
    }
    .faq-question {
      font-weight: 700;
      color: white;
      display: flex;
      justify-content: space-between;
    }

    footer {
      background: #060912;
      padding: 40px 0;
      text-align: center;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .feature-asym { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      h1 { font-size: 2.8rem; }
      .hero-grid { flex-direction: column; }
    }