/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-dark: #D63E1A;
      --secondary: #1A1A1A;
      --accent: #F5A623;
      --success: #2ECC71;
      --danger: #E74C3C;
      --bg-light: #FAFAFA;
      --bg-gray: #F0F0F0;
      --text-main: #1A1A1A;
      --text-muted: #5A5A5A;
      --white: #FFFFFF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(240,78,35,0.12);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --font-number: 'DIN Alternate', 'Bebas Neue', 'PingFang SC', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 PC */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 40px;
      transition: background 0.3s, box-shadow 0.3s;
      background: transparent;
      color: white;
    }
    .navbar.scrolled {
      background: var(--white);
      color: var(--secondary);
      box-shadow: 0 2px 10px rgba(0,0,0,0.05);
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .navbar.scrolled .nav-links a {
      color: var(--secondary);
    }
    .navbar.scrolled .logo-text {
      color: var(--secondary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      font-size: 16px;
    }
    .nav-links a {
      color: white;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease, left 0.25s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
      left: 0;
    }
    .btn-primary-nav {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s, box-shadow 0.2s;
    }
    .btn-primary-nav:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 18px rgba(240,78,35,0.5);
    }
    .logo-text {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 24px;
      letter-spacing: 1px;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 28px;
      color: var(--accent);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: white;
      box-shadow: 0 -4px 15px rgba(0,0,0,0.06);
      z-index: 100;
      justify-content: space-around;
      align-items: center;
      padding: 0 12px;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: #888;
      transition: 0.2s;
      font-weight: 500;
    }
    .mobile-nav-item i {
      font-size: 20px;
      margin-bottom: 4px;
    }
    .mobile-nav-item.active {
      color: var(--primary);
    }
    .mobile-center-btn {
      background: var(--primary);
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-top: -20px;
      box-shadow: 0 6px 14px rgba(240,78,35,0.4);
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1A1A1A 0%, #2D1A14 60%, #F04E23 100%);
      position: relative;
      overflow: hidden;
      padding-top: 64px;
    }
    .hero-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 50%, rgba(245,166,35,0.15) 0%, transparent 60%);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      font-family: var(--font-title);
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }
    .hero-left p {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }
    .btn-main {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .btn-main:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 22px rgba(240,78,35,0.5);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(240,78,35,0.1);
    }
    .trust-text {
      color: rgba(255,255,255,0.7);
      font-size: 14px;
    }
    .hero-right img {
      border-radius: 24px;
      box-shadow: 0 25px 50px rgba(0,0,0,0.5);
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }

    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-family: var(--font-title);
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--secondary);
    }
    .section-subtitle {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 16px;
    }

    /* 优势网格 */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .adv-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .adv-card h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .second-row {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 24px;
      max-width: 66%;
    }

    /* 产品卡片瀑布流 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .product-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
      display: flex;
      flex-direction: column;
    }
    .product-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .product-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .product-info {
      padding: 20px;
    }
    .product-info h3 {
      font-size: 22px;
      font-weight: 700;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 12px 0;
    }
    .tag {
      background: rgba(240,78,35,0.1);
      color: var(--primary);
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 600;
    }

    /* 流程 */
    .process-timeline {
      display: flex;
      justify-content: space-between;
      position: relative;
      margin-top: 40px;
    }
    .process-step {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-number {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin: 0 auto 16px;
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 32px;
      align-items: center;
    }
    .vs-badge {
      font-size: 32px;
      font-weight: 800;
      color: rgba(240,78,35,0.4);
    }
    .compare-col {
      background: white;
      border-radius: 16px;
      padding: 32px;
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      color: var(--primary);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      padding: 16px 20px;
      cursor: pointer;
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #F04E23, #D63E1A);
      padding: 80px 0;
      text-align: center;
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .products-grid { grid-template-columns: repeat(2,1fr); }
      .adv-grid { grid-template-columns: repeat(2,1fr); }
      .second-row { max-width: 100%; grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .navbar { display: none; }
      .mobile-bottom-nav { display: flex; }
      .hero-left h1 { font-size: 32px; }
      .products-grid, .adv-grid, .stats-grid, .faq-grid, .footer-grid { grid-template-columns: 1fr; }
      .compare-table { grid-template-columns: 1fr; }
      .vs-badge { text-align: center; }
      .process-timeline { flex-direction: column; gap: 24px; }
    }