/* roulang page: index */
:root {
      --bg-deep: #1A2A2F;
      --bg-darker: #152025;
      --amber: #D4A843;
      --amber-light: #C89B3C;
      --teal: #00C9A7;
      --teal-bright: #0EBF9A;
      --white-5: rgba(255, 255, 255, 0.05);
      --white-10: rgba(255, 255, 255, 0.1);
      --white-70: rgba(255, 255, 255, 0.7);
      --white-90: rgba(255, 255, 255, 0.9);
      --card-bg: rgba(37, 51, 56, 0.7);
      --card-border: rgba(212, 168, 67, 0.25);
      --radius-sm: 12px;
      --radius-md: 20px;
      --radius-xl: 24px;
      --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.5);
      --shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.6);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif;
      --font-metrics: "Inter", "SF Pro Display", system-ui, -apple-system;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-deep);
      color: #fff;
    }

    body {
      font-family: var(--font-sans);
      line-height: 1.7;
      background: linear-gradient(175deg, #1A2A2F 0%, #152025 100%);
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(26, 42, 47, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 1000;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      transition: background 0.3s;
    }

    .logo {
      font-family: var(--font-sans);
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: 1px;
      color: #fff;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo span {
      background: linear-gradient(135deg, var(--amber) 0%, #f5d76e 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

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

    .nav-links a {
      color: var(--white-70);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

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

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

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      z-index: 1100;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: #fff;
      border-radius: 4px;
      transition: all 0.3s;
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(21, 32, 37, 0.98);
      backdrop-filter: blur(30px);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2.5rem;
      transform: translateY(-100%);
      transition: transform 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
      z-index: 1050;
    }

    .mobile-menu.open {
      transform: translateY(0);
    }

    .mobile-menu a {
      font-size: 2rem;
      font-weight: 600;
      color: #fff;
      text-decoration: none;
      letter-spacing: 2px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      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 30% 40%, rgba(212,168,67,0.12) 0%, transparent 60%);
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
      width: 100%;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.5px;
      margin-bottom: 1.5rem;
      color: #fff;
    }

    .hero-text h1 span {
      color: var(--amber);
      background: linear-gradient(to right, #e0b84c, #ffd966);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--white-70);
      margin-bottom: 2.2rem;
      max-width: 520px;
    }

    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #D4A843 0%, #b58b2c 100%);
      border: none;
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1rem;
      color: #0a1a1f;
      cursor: pointer;
      transition: all 0.3s;
      box-shadow: 0 8px 22px rgba(212,168,67,0.3);
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 12px 28px rgba(212,168,67,0.4);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--amber);
      color: var(--amber);
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.3s;
      text-decoration: none;
    }

    .btn-ghost:hover {
      background: rgba(212,168,67,0.1);
      border-color: #e6b422;
      color: #fff;
    }

    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .data-preview {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: 32px;
      padding: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      box-shadow: var(--shadow-card);
    }

    .metric-badge {
      background: rgba(255,255,255,0.03);
      border-radius: 20px;
      padding: 16px 22px;
      text-align: center;
    }

    .metric-number {
      font-family: var(--font-metrics);
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--amber);
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: #fff;
    }

    .section-sub {
      color: var(--white-70);
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border-radius: 24px;
      padding: 28px 20px;
      text-align: center;
      border: 1px solid var(--white-5);
      transition: 0.3s;
    }

    .metric-card:hover {
      border-color: var(--amber);
      transform: translateY(-5px);
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: rgba(37, 51, 56, 0.6);
      backdrop-filter: blur(14px);
      border-radius: 28px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.08);
      transition: all 0.3s;
    }

    .service-card:hover {
      border-color: var(--amber);
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }

    .card-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      background: #1e2f35;
    }

    .card-body {
      padding: 24px;
    }

    .tag {
      background: rgba(0,201,167,0.15);
      color: var(--teal);
      padding: 4px 14px;
      border-radius: 50px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* 对比 */
    .compare-row {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      align-items: center;
      justify-content: center;
    }

    .compare-card {
      flex: 1 1 280px;
      background: #253338;
      border-radius: 28px;
      padding: 28px;
      border: 1px solid transparent;
    }

    .compare-card.highlight {
      border-color: var(--amber);
      background: rgba(212,168,67,0.08);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 18px 0;
    }

    .faq-question {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: #fff;
    }

    .faq-answer {
      color: var(--white-70);
      padding-top: 12px;
      display: none;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单 */
    .cta-section {
      background: rgba(0,0,0,0.3);
      border-radius: 40px;
      padding: 50px;
      backdrop-filter: blur(15px);
    }

    .form-input {
      background: #1e2f35;
      border: 1px solid rgba(255,255,255,0.2);
      padding: 14px 20px;
      border-radius: 40px;
      color: #fff;
      width: 100%;
      margin-bottom: 16px;
    }

    .form-input:focus {
      border-color: var(--amber);
      outline: none;
    }

    footer {
      background: #0f1a1e;
      padding: 48px 0 24px;
    }

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

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-text h1 { font-size: 2.3rem; }
      .metrics-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-row { flex-direction: column; }
      .cta-section { padding: 32px; }
    }