/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent-red: #E94E3C;
      --accent-gold: #F5A623;
      --bg-light: #F9FAFB;
      --white: #FFFFFF;
      --text-main: #1F2937;
      --text-muted: #6B7280;
      --text-on-dark: #FFFFFF;
      --border-light: #E5E7EB;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-hover: 0 10px 25px rgba(0,0,0,0.08);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-num: 'Inter', 'SF Pro Display', 'PingFang SC', sans-serif;
      --transition: 0.2s ease;
      --container-max: 1200px;
      --section-gap: 100px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-main);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
    }

    h1 { font-size: clamp(36px, 5vw, 48px); line-height: 1.2; }
    h2 { font-size: clamp(28px, 4vw, 36px); line-height: 1.3; margin-bottom: 1rem; }
    h3 { font-size: clamp(20px, 2.5vw, 24px); line-height: 1.4; font-weight: 600; }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

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

    button, .btn {
      font-family: inherit;
      cursor: pointer;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      font-weight: 600;
      transition: all var(--transition);
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.25s ease, box-shadow 0.25s ease;
      padding: 16px 0;
    }

    .site-header.scrolled {
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(6px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      padding: 10px 0;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: 1px;
      white-space: nowrap;
    }

    .logo i {
      color: var(--accent-red);
      font-size: 1.8rem;
    }

    .site-header.scrolled .logo {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-red);
      transition: width var(--transition);
    }

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

    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      box-shadow: 0 4px 10px rgba(233,78,60,0.2);
    }

    .btn-primary:hover {
      background: #C0392B;
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(233,78,60,0.3);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(10,14,39,0.04);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      color: var(--primary);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(8px);
      z-index: 999;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--primary);
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background-color: var(--bg-light);
      background-image: radial-gradient(circle at 80% 20%, rgba(245,166,35,0.05) 0%, transparent 35%);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      right: 0;
      width: 45%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.08;
      mask-image: linear-gradient(to left, black 30%, transparent);
      -webkit-mask-image: linear-gradient(to left, black 30%, transparent);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-content h1 {
      color: var(--primary);
      margin-bottom: 16px;
      font-weight: 700;
    }

    .hero-content .subtitle {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 500px;
    }

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

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

    .visual-card {
      width: 100%;
      max-width: 420px;
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-hover);
      overflow: hidden;
      border: 1px solid var(--border-light);
    }

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

    /* 通用板块 */
    .section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-title h2 {
      color: var(--primary);
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: all var(--transition);
      position: relative;
      overflow: hidden;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-left: 3px solid var(--accent-red);
    }

    .feature-icon {
      font-size: 2.2rem;
      color: var(--accent-red);
      margin-bottom: 16px;
    }

    .feature-card h3 {
      margin-bottom: 8px;
    }

    /* 步骤 */
    .steps-flow {
      display: flex;
      gap: 24px;
      align-items: flex-start;
      justify-content: center;
      flex-wrap: wrap;
    }

    .step-card {
      background: #F9FAFB;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      flex: 1 1 200px;
      max-width: 280px;
      text-align: center;
      position: relative;
    }

    .step-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-red);
      font-family: var(--font-num);
      margin-bottom: 8px;
    }

    /* 案例瀑布 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      grid-auto-rows: auto;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: all var(--transition);
    }

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

    .case-img {
      position: relative;
      overflow: hidden;
      height: 180px;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .case-card:hover .case-img img {
      transform: scale(1.05);
    }

    .case-info {
      padding: 16px;
    }

    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }

    .plan-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      position: relative;
    }

    .plan-card.recommended {
      border: 2px solid var(--accent-red);
      transform: scale(1.03);
      box-shadow: var(--shadow-hover);
      background: #FFF5F4;
    }

    .plan-badge {
      background: var(--accent-red);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 数据带 */
    .stats-band {
      background: var(--primary);
      padding: 70px 0;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 30px;
    }

    .stat-item .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent-gold);
      font-family: var(--font-num);
    }

    .stat-label {
      color: rgba(255,255,255,0.8);
    }

    /* FAQ */
    .faq-layout {
      display: grid;
      grid-template-columns: 200px 1fr;
      gap: 40px;
    }

    .faq-categories {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .faq-cat {
      background: none;
      padding: 10px 16px;
      border-radius: 6px;
      font-weight: 500;
      color: var(--text-muted);
      transition: 0.2s;
    }

    .faq-cat.active {
      background: var(--accent-red);
      color: white;
    }

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

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #F2F4F7;
      padding: 60px 0 30px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .case-grid { grid-template-columns: repeat(2,1fr); }
      .compare-grid { grid-template-columns: 1fr; }
      .faq-layout { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .features-grid, .case-grid, .footer-grid { grid-template-columns: 1fr; }
      .hero { padding: 130px 0 60px; }
      .steps-flow { flex-direction: column; align-items: center; }
    }