/* roulang page: index */
:root {
      --primary-deep: #0A3D2E;
      --accent-orange: #F85C1E;
      --bg-warm: #F7F5F0;
      --dark-bg: #0F1F1A;
      --text-main: #1A1A1A;
      --text-muted: #5C5C5C;
      --text-on-dark: #F0EDE6;
      --border-light: #D9E2DB;
      --gold-badge: #D4A843;
      --card-shadow: 0 2px 12px rgba(10,61,46,0.06);
      --card-hover-shadow: 0 8px 28px rgba(10,61,46,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-title: 'Alibaba PuHuiTi', 'PingFang SC', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Noto Sans SC', 'Inter', sans-serif;
      --font-number: 'Inter', 'DIN Alternate', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    /* 导航 */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 100;
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 24px;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 16px;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

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

    .nav-cta {
      background: var(--accent-orange);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 15px;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: #D94A18;
      transform: scale(1.03);
      color: white;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--primary-deep);
      border-radius: 3px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 10px 20px rgba(0,0,0,0.08);
      flex-direction: column;
      align-items: center;
      gap: 24px;
      padding: 32px 24px;
      z-index: 99;
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-main);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A3D2E 0%, #0B2A20 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      margin-top: 72px;
    }

    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 48px;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 80px 24px;
    }

    .hero-text {
      flex: 1;
    }

    .hero h1 {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 52px;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 20px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 36px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      font-weight: 700;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-size: 17px;
      transition: 0.2s;
      border: none;
      cursor: pointer;
      display: inline-block;
    }

    .btn-primary:hover {
      background: #D94A18;
      transform: scale(1.03);
    }

    .btn-outline {
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
      font-weight: 700;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-size: 17px;
      transition: 0.2s;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }

    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
    }

    .hero-visual img {
      max-height: 400px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }

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

    .section-title {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 38px;
      margin-bottom: 16px;
      color: var(--primary-deep);
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 48px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }

    .card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--accent-orange);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: white;
      font-size: 24px;
    }

    /* 产品交错 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

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

    .feature-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 12px 30px rgba(0,0,0,0.1);
    }

    .feature-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .feature-desc {
      flex: 1;
    }

    /* 场景卡片 */
    .scenario-card {
      background: #EDF2EF;
      border-radius: 20px;
      overflow: hidden;
    }

    .scenario-card img {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }

    .gold-number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 48px;
      color: var(--gold-badge);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 700;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--primary-deep);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }

    .faq-answer.open {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA 底部 */
    .cta-band {
      background: var(--primary-deep);
      padding: 80px 24px;
      text-align: center;
      color: white;
    }

    footer {
      background: var(--dark-bg);
      color: #B0B8B4;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .feature-row { flex-direction: column; }
      .feature-row.reverse { flex-direction: column; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero h1 { font-size: 42px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .section-title { font-size: 30px; }
      .hero h1 { font-size: 36px; }
    }