/* roulang page: index */
/* ----- CSS 设计变量 ----- */
    :root {
      --primary-deep: #1A1A2E;
      --accent-coral: #E94560;
      --secondary-blue: #0F3460;
      --bg-light: #F8F9FA;
      --card-white: #FFFFFF;
      --text-heading: #1A1A2E;
      --text-body: #4A4A4A;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.06);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.12);
      --spacing-xs: 8px;
      --spacing-sm: 16px;
      --spacing-md: 24px;
      --spacing-lg: 48px;
      --spacing-xl: 72px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
      --transition: 0.3s ease;
    }

    /* ----- Reset / Base ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    ul, ol {
      list-style: none;
    }
    h1, h2, h3 {
      font-weight: 700;
      color: var(--text-heading);
      line-height: 1.3;
    }
    h1 span, h2 span {
      color: var(--accent-coral);
    }

    /* ----- 容器 ----- */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 var(--spacing-md);
    }

    /* ----- 导航 (固定顶部) ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(10px);
      z-index: 1000;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
      border-bottom: 0.5px solid transparent;
      transition: border-color var(--transition), box-shadow var(--transition);
    }
    .site-header.scrolled {
      border-bottom: 0.5px solid var(--border-light);
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-area {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .logo-text {
      font-size: 1.7rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: var(--primary-deep);
      line-height: 1;
    }
    .logo-domain {
      font-size: 0.7rem;
      font-weight: 400;
      color: var(--text-muted);
      margin-left: 2px;
      letter-spacing: 0.3px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-body);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: all var(--transition);
      font-size: 0.95rem;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--accent-coral);
      border-bottom-color: var(--accent-coral);
    }
    .nav-cta {
      padding: 10px 22px;
      background: var(--accent-coral);
      color: white;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9rem;
      border: none;
      white-space: nowrap;
      transition: background var(--transition);
    }
    .nav-cta:hover {
      background: #C81E45;
      color: white;
    }
    .hamburger {
      display: none;
      font-size: 1.7rem;
      background: none;
      border: none;
      color: var(--primary-deep);
      cursor: pointer;
      width: 44px;
      height: 44px;
      align-items: center;
      justify-content: center;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 32px 24px;
      box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
      z-index: 999;
    }
    .mobile-menu.open {
      display: flex;
    }
    .mobile-menu a {
      padding: 14px 8px;
      font-weight: 600;
      border-bottom: 1px solid var(--border-light);
      color: var(--primary-deep);
      font-size: 1.1rem;
    }
    .mobile-cta {
      margin-top: 20px;
      text-align: center;
      background: var(--accent-coral);
      color: white;
      padding: 14px;
      border-radius: var(--radius-sm);
      font-weight: 700;
    }

    /* 英雄区复用背景路径 coverpic artist */
    .hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #0F3460 100%);
      position: relative;
      overflow: hidden;
      padding: 160px 0 100px;
      margin-bottom: 0;
      display: flex;
      align-items: center;
      min-height: 80vh;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 300%;
      height: 300%;
      top: -100%;
      left: -100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200"><path d="M80 20L120 20L140 60L120 100L80 100L60 60Z" fill="none" stroke="white" stroke-opacity="0.05" stroke-width="2"/><path d="M130 70L160 100L130 130L100 130L70 100" fill="none" stroke="white" stroke-opacity="0.05" stroke-width="2"/></svg>') repeat;
      opacity: 0.2;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-content h1 {
      font-size: clamp(2.2rem, 5vw, 2.8rem);
      color: white;
      margin-bottom: 20px;
      line-height: 1.2;
    }
    .hero-content p {
      font-size: 1.2rem;
      color: rgba(255, 255, 255, 0.75);
      margin-bottom: 32px;
      max-width: 90%;
    }
    .btn-primary {
      background: var(--accent-coral);
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 1rem;
      display: inline-block;
      transition: background var(--transition);
    }
    .btn-primary:hover {
      background: #C81E45;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-coral);
      color: var(--accent-coral);
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: var(--accent-coral);
      color: white;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      height: 360px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
      position: relative;
    }

    /* 板块共用 */
    .section {
      padding: var(--spacing-xl) 0;
    }
    .section-heading {
      text-align: center;
      margin-bottom: 52px;
    }
    .section-heading h2 {
      font-size: 2.1rem;
      margin-bottom: 12px;
    }
    .section-heading p {
      color: var(--text-muted);
      font-size: 1.15rem;
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .card {
      background: var(--card-white);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .icon-circle {
      width: 56px;
      height: 56px;
      border: 2px solid var(--accent-coral);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: var(--accent-coral);
      margin-bottom: 18px;
    }
    .card h3 {
      margin-bottom: 12px;
    }
    .scenario-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .scenario-text {
      flex: 1;
    }
    .scenario-img {
      flex: 1;
      min-height: 260px;
      border-radius: var(--radius-md);
      background-size: cover;
      background-position: center;
      box-shadow: var(--shadow-sm);
    }
    .tag {
      display: inline-block;
      background: rgba(233, 69, 96, 0.08);
      color: var(--accent-coral);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--secondary-blue);
      color: white;
      padding: 36px 24px;
      border-radius: var(--radius-md);
      text-align: center;
    }
    .big-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent-coral);
      line-height: 1.2;
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .price-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 20px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      border: 2px solid transparent;
      position: relative;
    }
    .price-card.recommended {
      border-color: var(--accent-coral);
    }
    .badge-recommend {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent-coral);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 700;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    .cta-footer {
      background: linear-gradient(135deg, #1A1A2E, #0F3460);
      padding: 72px 0;
      text-align: center;
      color: white;
    }
    .site-footer {
      background: #1A1A2E;
      color: white;
      padding: 28px 0;
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .cards-grid { grid-template-columns: repeat(2, 1fr); }
      .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 767px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .cards-grid, .stats-grid, .pricing-grid { grid-template-columns: 1fr; }
      .scenario-row { flex-direction: column; }
    }