/* roulang page: index */
:root {
      --deep-space: #0B0E17;
      --dark-blue-gray: #141926;
      --amber-gold: #E6A94F;
      --ice-blue: #5DADE2;
      --fog-gray: #B0B8C8;
      --light-gray-blue: #E2E6ED;
      --pure-white: #FFFFFF;
      --glass-bg: rgba(20, 25, 38, 0.7);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-highlight: rgba(255, 255, 255, 0.15);
      --card-radius: 12px;
      --btn-radius: 8px;
      --shadow-deep: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-amber: 0 0 18px rgba(230, 169, 79, 0.5);
      --glow-amber-hover: 0 0 28px rgba(230, 169, 79, 0.8);
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--deep-space);
      color: var(--fog-gray);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
      color: var(--light-gray-blue);
      margin-bottom: 0.75rem;
    }

    h1 {
      font-size: 44px;
      font-weight: 700;
      color: var(--pure-white);
      line-height: 1.2;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 32px;
      line-height: 1.3;
      color: var(--light-gray-blue);
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--pure-white);
      line-height: 1.4;
    }

    h4 {
      font-size: 17px;
      font-weight: 600;
      color: var(--light-gray-blue);
    }

    p {
      color: var(--fog-gray);
      margin-bottom: 1rem;
      line-height: 1.7;
    }

    a {
      color: var(--ice-blue);
      text-decoration: none;
      transition: color 0.2s ease, border-color 0.2s ease;
    }

    a:hover {
      color: var(--pure-white);
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏 */
    .milan-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 14, 23, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      z-index: 100;
      padding: 0.75rem 0;
      transition: background 0.3s ease;
    }

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

    .logo {
      font-family: var(--font-heading);
      font-size: 24px;
      font-weight: 700;
      color: var(--pure-white);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo .dot {
      display: inline-block;
      width: 6px;
      height: 6px;
      background: var(--amber-gold);
      border-radius: 50%;
      margin-left: 2px;
    }

    .desktop-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-link {
      font-size: 15px;
      color: var(--fog-gray);
      font-weight: 500;
      transition: color 0.2s;
      text-decoration: none;
    }

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

    .btn-amber {
      background: var(--amber-gold);
      color: var(--deep-space);
      font-weight: 700;
      padding: 0.7rem 1.8rem;
      border-radius: var(--btn-radius);
      border: none;
      font-size: 15px;
      cursor: pointer;
      box-shadow: var(--glow-amber);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      letter-spacing: 0.5px;
    }

    .btn-amber:hover {
      box-shadow: var(--glow-amber-hover);
      background: #f0b95b;
      color: #0B0E17;
      text-decoration: none;
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--ice-blue);
      color: var(--ice-blue);
      padding: 0.65rem 1.6rem;
      border-radius: var(--btn-radius);
      font-weight: 600;
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-ghost:hover {
      background: rgba(93, 173, 226, 0.1);
      border-color: var(--pure-white);
      color: var(--pure-white);
    }

    .btn-glass {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.12);
      color: var(--pure-white);
      padding: 0.7rem 1.8rem;
      border-radius: var(--btn-radius);
      font-weight: 500;
      transition: 0.2s;
    }

    .btn-glass:hover {
      background: rgba(255,255,255,0.12);
      border-color: rgba(255,255,255,0.3);
    }

    .menu-toggle {
      background: none;
      border: none;
      color: var(--pure-white);
      font-size: 1.8rem;
      display: none;
      cursor: pointer;
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-deep);
      padding: 2rem;
      position: relative;
      transition: transform 0.3s ease, border-color 0.2s;
    }

    .glass-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 1px;
      background: linear-gradient(90deg, rgba(255,255,255,0.18) 0%, rgba(255,255,255,0.02) 70%);
      border-radius: var(--card-radius) var(--card-radius) 0 0;
    }

    .glass-card:hover {
      border-color: rgba(255,255,255,0.18);
      transform: translateY(-4px);
    }

    .section {
      padding: 80px 0;
    }

    .section-dark {
      background-color: var(--deep-space);
    }

    .text-amber {
      color: var(--amber-gold);
    }

    .text-ice {
      color: var(--ice-blue);
    }

    .mono {
      font-family: var(--font-mono);
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(11,14,23,0.9) 0%, rgba(11,14,23,0.65) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
    }

    .hero-content {
      max-width: 700px;
    }

    .hero h1 {
      margin-bottom: 1.2rem;
    }

    .hero .sub {
      font-size: 18px;
      color: var(--fog-gray);
      margin-bottom: 2rem;
    }

    .flex-row {
      display: flex;
      align-items: center;
      gap: 1.5rem;
      flex-wrap: wrap;
    }

    /* 网格覆写 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }

    .scenario-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 5rem;
    }

    .scenario-row.reverse {
      flex-direction: row-reverse;
    }

    .cases-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.8rem;
      margin-top: 2rem;
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
      align-items: start;
      margin-top: 2rem;
    }

    .pricing-card.featured {
      transform: scale(1.03);
      border: 1px solid var(--amber-gold);
      box-shadow: 0 0 20px rgba(230,169,79,0.3);
      position: relative;
    }

    .badge {
      background: var(--amber-gold);
      color: #0B0E17;
      font-weight: 700;
      padding: 0.25rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
      position: absolute;
      top: -12px;
      right: 20px;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 1.2rem 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      font-weight: 600;
      color: var(--light-gray-blue);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--fog-gray);
      padding-left: 1.8rem;
    }

    .footer-links {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }

    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .cases-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .desktop-links { display: none; }
      .menu-toggle { display: block; }
      .features-grid, .cases-grid, .pricing-grid { grid-template-columns: 1fr; }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
      .pricing-card.featured { transform: none; }
      .hero { text-align: center; }
      .flex-row { justify-content: center; }
    }

    .mobile-menu {
      display: none;
      background: rgba(11,14,23,0.95);
      backdrop-filter: blur(25px);
      position: fixed;
      top: 65px;
      left: 0;
      width: 100%;
      padding: 2rem;
      flex-direction: column;
      gap: 1.5rem;
      z-index: 99;
    }

    .mobile-menu a {
      color: var(--fog-gray);
      font-size: 1.2rem;
    }