/* roulang page: index */
:root {
      --primary: #E43D12;
      --primary-dark: #C1310F;
      --secondary: #1A1A2E;
      --accent: #FFB800;
      --bg-light: #F5F5F0;
      --bg-dark: #0F0F1A;
      --text-dark: #1A1A2E;
      --text-body: #4A4A4A;
      --text-muted: #7A7A7A;
      --text-light: #E0E0E0;
      --white: #FFFFFF;
      --card-shadow: 0 8px 30px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 14px 40px rgba(0,0,0,0.10);
      --gradient-brand: linear-gradient(135deg, #E43D12 0%, #FF6B35 100%);
      --border-radius-card: 20px;
      --border-radius-sm: 12px;
      --border-radius-btn: 30px;
      --transition: all 0.25s ease-in-out;
      --font-en: 'Inter', 'Roboto', 'Oswald', sans-serif;
      --font-zh: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body {
      font-family: var(--font-zh);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    h1, h2, h3, h4 { font-weight: 700; color: var(--text-dark); line-height: 1.3; }
    h1 { font-size: 56px; font-weight: 800; letter-spacing: -0.5px; }
    h2 { font-size: 40px; font-weight: 700; margin-bottom: 16px; }
    h3 { font-size: 24px; font-weight: 600; }
    p { margin-bottom: 1rem; color: var(--text-body); font-size: 17px; }
    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--primary-dark); text-decoration: underline; }
    img { max-width: 100%; height: auto; display: block; }
    button { cursor: pointer; font-family: inherit; }
    .bg-deep { background-color: var(--secondary); color: white; }
    .section { padding: 100px 0; }
    @media (max-width: 768px) {
      h1 { font-size: 38px; }
      h2 { font-size: 30px; }
      h3 { font-size: 20px; }
      p { font-size: 15px; }
      .section { padding: 60px 0; }
      .container { padding: 0 16px; }
    }
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 36px;
      border-radius: var(--border-radius-btn);
      font-weight: 600;
      font-size: 17px;
      transition: var(--transition);
      border: none;
      text-decoration: none;
      gap: 8px;
      line-height: 1.2;
    }
    .btn-primary {
      background: var(--gradient-brand);
      color: white;
      box-shadow: 0 8px 20px rgba(228,61,18,0.25);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 0 24px rgba(228,61,18,0.5);
      color: white;
      text-decoration: none;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
      text-decoration: none;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(0,0,0,0.08);
    }
    .btn-white:hover { background: #f0f0f0; transform: translateY(-2px); }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      padding: 0 24px;
      height: 72px;
      display: flex;
      align-items: center;
      background: transparent;
    }
    .site-header.scrolled {
      background: white;
      box-shadow: 0 7px 25px rgba(0,0,0,0.08);
      backdrop-filter: blur(6px);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
    }
    .logo {
      font-size: 26px;
      font-weight: 800;
      color: white;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .scrolled .logo { color: var(--text-dark); }
    .logo span { color: var(--primary); }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 16px;
    }
    .scrolled .nav-links a { color: var(--text-dark); }
    .nav-links a:hover { color: var(--primary); text-decoration: none; }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: white;
      display: block;
      transition: 0.2s;
    }
    .scrolled .hamburger span { background: var(--text-dark); }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--secondary);
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        transform: translateY(-120%);
        opacity: 0;
        transition: 0.3s ease;
        align-items: flex-start;
      }
      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
      }
      .nav-links a { color: white !important; font-size: 18px; }
      .hamburger { display: flex; }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, rgba(26,26,46,0.7) 0%, rgba(228,61,18,0.3) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
      color: white;
    }
    .hero-content {
      max-width: 720px;
      margin-top: 30px;
    }
    .hero h1 {
      color: white;
      margin-bottom: 20px;
      font-size: 58px;
    }
    .hero .subtitle {
      font-size: 20px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 36px;
      line-height: 1.6;
    }
    .hero-btns { display: flex; gap: 18px; flex-wrap: wrap; }
    .badge-floating {
      position: absolute;
      right: 40px;
      bottom: 60px;
      background: rgba(255,184,0,0.15);
      backdrop-filter: blur(10px);
      padding: 16px 28px;
      border-radius: var(--border-radius-sm);
      border: 1px solid var(--accent);
      color: white;
      font-weight: 700;
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .badge-floating .big-num {
      font-family: 'Oswald', var(--font-en);
      font-size: 44px;
      font-weight: 700;
      color: var(--accent);
    }
    /* 卡片系统 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 36px 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      height: 100%;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
      border: 1px solid var(--primary);
    }
    .card-icon {
      font-size: 42px;
      color: var(--primary);
      margin-bottom: 18px;
      display: block;
    }
    .data-badge {
      display: inline-block;
      background: #FFF0E8;
      color: var(--text-dark);
      font-weight: 700;
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 14px;
      margin-top: 14px;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--border-radius-card);
      padding: 32px;
      position: relative;
      box-shadow: var(--card-shadow);
    }
    .quote-icon {
      font-size: 64px;
      color: rgba(255,184,0,0.25);
      position: absolute;
      top: 10px;
      left: 20px;
    }
    /* FAQ */
    .faq-item {
      background: #F5F5F0;
      border-radius: 16px;
      margin-bottom: 14px;
      padding: 20px 28px;
      cursor: pointer;
    }
    .faq-q {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
    }
    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .card-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .card-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 40px; }
      .badge-floating { position: static; margin-top: 30px; width: fit-content; }
    }
    footer {
      background: var(--bg-dark);
      color: #A0A0A0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-bottom {
      border-top: 1px solid #2A2A3A;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
    }