/* roulang page: index */
:root {
      --deep-blue: #0A1A3A;
      --bg-gradient-1: #0F2440;
      --cyan: #00E5FF;
      --warm-orange: #FF6B35;
      --card-bg: rgba(26, 42, 68, 0.7);
      --text-bright: #E8EDF5;
      --text-muted: #8A9BB5;
      --border-glow: rgba(0, 229, 255, 0.15);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --radius-section: 24px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition-smooth: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 30% 10%, #0F2440, #0A1A3A 80%);
      color: var(--text-bright);
      line-height: 1.5;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 26, 58, 0.85);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.25);
      z-index: 100;
      display: flex;
      align-items: center;
      transition: var(--transition-smooth);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--cyan);
      letter-spacing: 1px;
    }

    .logo-icon {
      font-size: 2rem;
      filter: drop-shadow(0 0 6px rgba(0,229,255,0.5));
    }

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

    .nav-links a {
      font-weight: 500;
      color: var(--text-bright);
      transition: color 0.2s;
      position: relative;
      font-size: 0.95rem;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.2s;
    }

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

    .mobile-bottom-nav {
      display: none;
    }

    /* 汉堡菜单（移动端备用） */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--cyan);
      font-size: 2rem;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10, 26, 58, 0.9);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 12px 16px;
        border-top: 1px solid rgba(0,229,255,0.3);
        z-index: 99;
      }
      .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        color: var(--text-muted);
        gap: 4px;
      }
      .mobile-bottom-nav a i {
        font-size: 1.3rem;
      }
      .mobile-bottom-nav a.active {
        color: var(--cyan);
      }
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
      position: relative;
    }

    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    /* 波浪分隔 */
    .wave-divider {
      position: absolute;
      top: -2px;
      left: 0;
      width: 100%;
      overflow: hidden;
      line-height: 0;
      transform: rotate(180deg);
    }
    .wave-divider svg {
      position: relative;
      display: block;
      width: calc(100% + 1.3px);
      height: 60px;
    }
    .wave-divider .wave-fill {
      fill: #0A1A3A;
      opacity: 0.7;
    }

    /* 首屏 Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(0,229,255,0.08) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 400px;
    }
    .hero-right {
      flex: 1 1 380px;
      display: flex;
      justify-content: center;
      position: relative;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      color: white;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .hero .subtitle {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cyan);
      color: #0A1A3A;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      box-shadow: 0 0 20px rgba(0,229,255,0.5);
      transition: all 0.25s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,229,255,0.7);
      transform: scale(1.03);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-ghost:hover {
      background: rgba(0,229,255,0.1);
      box-shadow: 0 0 15px rgba(0,229,255,0.4);
    }
    .mockup-img {
      max-width: 320px;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.6));
      border-radius: 40px;
      background: transparent;
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 2.4rem;
      }
      .btn-group {
        justify-content: center;
      }
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: transform 0.25s, border-color 0.2s;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,229,255,0.5);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(0,229,255,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--cyan);
      margin-bottom: 20px;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }
    @media (max-width: 768px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }

    /* 产品横向滚动 */
    .scroll-container {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0 30px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .scroll-card {
      min-width: 280px;
      flex: 0 0 auto;
      scroll-snap-align: start;
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-glow);
      overflow: hidden;
    }
    .scroll-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .scroll-card-content {
      padding: 20px;
    }
    .text-cyan {
      color: var(--cyan);
      font-weight: 600;
    }

    /* 流程 */
    .steps {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .step-item {
      text-align: center;
      flex: 1;
      min-width: 160px;
    }
    .step-number {
      font-size: 4rem;
      font-weight: 900;
      background: linear-gradient(135deg, var(--cyan), #0088cc);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 数据卡片 */
    .data-highlight {
      color: var(--warm-orange);
      font-size: 2.8rem;
      font-weight: 800;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(0,229,255,0.1);
    }
    .faq-question {
      padding: 20px 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      border-left: 4px solid var(--cyan);
      padding-left: 16px;
      transition: 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding-left: 20px;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* CTA 区块 */
    .cta-block {
      background: #0A1A3A;
      text-align: center;
      border-radius: var(--radius-section);
      padding: 70px 20px;
    }

    footer {
      background: #0F1A2E;
      padding: 50px 0 30px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .steps {
        flex-direction: column;
        align-items: center;
      }
    }