/* roulang page: index */
/* ----- 设计变量 & 全局重置 ----- */
    :root {
      --primary-deep: #0A0E27;
      --primary-mid: #1A1F4E;
      --accent-pink: #FF2D55;
      --accent-light: #FF5E7A;
      --bg-light: #F5F5F7;
      --card-white: #FFFFFF;
      --text-dark: #1E1E2E;
      --text-gray: #6B6F80;
      --text-light-gray: #B0B3C1;
      --border-subtle: rgba(10, 14, 39, 0.08);
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-card: 0 4px 20px rgba(10, 14, 39, 0.06);
      --shadow-hover: 0 12px 32px rgba(10, 14, 39, 0.12);
      --transition-smooth: all 0.3s ease;
      --font-number: 'DIN Alternate', 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    body {
      font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      font-size: 16px;
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    h1, h2, h3, h4 {
      font-weight: 800;
      line-height: 1.3;
      color: var(--primary-deep);
    }

    h1 { font-size: 48px; font-weight: 900; }
    h2 { font-size: 36px; margin-bottom: 0.5rem; }
    h3 { font-size: 22px; font-weight: 700; }
    h4 { font-size: 18px; font-weight: 700; }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      h3 { font-size: 20px; }
    }

    /* 辅助文字 */
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-gray);
      margin-bottom: 2.5rem;
      font-weight: 500;
    }

    /* ----- 按钮系统 ----- */
    .btn-primary {
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-light));
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      box-shadow: 0 4px 12px rgba(255, 45, 85, 0.3);
      font-size: 16px;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(255, 45, 85, 0.4);
    }

    .btn-outline {
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 12px 30px;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
      transform: translateY(-2px);
    }

    /* ----- 导航 ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      z-index: 100;
      transition: var(--transition-smooth);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 28px;
      font-weight: 900;
      color: var(--primary-deep);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo::before {
      content: "⚡";
      font-size: 32px;
      color: var(--accent-pink);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--primary-deep);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-pink);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-pink);
      transition: width 0.2s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after { width: 100%; }
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 110;
    }
    .menu-toggle span {
      width: 26px;
      height: 3px;
      background: var(--primary-deep);
      border-radius: 3px;
      transition: var(--transition-smooth);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      z-index: 105;
    }
    .mobile-menu a {
      color: white;
      font-size: 24px;
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: flex; }
      .mobile-menu.active { display: flex; }
    }

    /* 板块间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section { padding: 60px 0; }
    }

    /* ----- Hero 双栏杂志流 ----- */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 3rem;
      padding-top: 120px;
      padding-bottom: 80px;
      background: linear-gradient(135deg, #F5F5F7 40%, rgba(26,31,78,0.03) 100%);
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-left h1 {
      font-size: 52px;
      font-weight: 900;
      margin-bottom: 1.5rem;
      background: linear-gradient(135deg, var(--primary-deep), #2D1B3D);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-left p {
      font-size: 18px;
      color: var(--text-gray);
      margin-bottom: 2rem;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 0 0 45%;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      min-height: 380px;
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      display: flex;
      align-items: flex-end;
      justify-content: flex-end;
    }
    .floating-badge {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      border-radius: 20px;
      padding: 12px 20px;
      margin: 16px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-card);
      border-left: 5px solid var(--accent-pink);
    }
    .floating-badge .number {
      font-family: var(--font-number);
      font-size: 28px;
      font-weight: 800;
      color: var(--accent-pink);
    }
    .floating-badge .label {
      font-size: 14px;
      color: var(--primary-deep);
    }
    @media (max-width: 768px) {
      .hero-grid { flex-direction: column; padding-top: 100px; }
      .hero-left, .hero-right { flex: 1 1 auto; width: 100%; }
      .hero-right { min-height: 280px; margin-top: 2rem; }
    }

    /* 核心亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      border: 1px solid var(--border-subtle);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      background: rgba(255,45,85,0.1);
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      font-size: 24px;
    }
    .highlight-number {
      font-family: var(--font-number);
      font-size: 36px;
      font-weight: 800;
      color: var(--primary-deep);
    }
    .highlight-label {
      color: var(--text-gray);
      font-size: 15px;
      margin-top: 4px;
    }
    @media (max-width: 768px) {
      .highlights-grid { grid-template-columns: 1fr; }
    }

    /* 案例瀑布流 (CSS columns) */
    .case-waterfall {
      columns: 3;
      column-gap: 24px;
      margin-top: 20px;
    }
    .case-card {
      break-inside: avoid;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      border: 1px solid var(--border-subtle);
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
    }
    .case-tag {
      background: linear-gradient(90deg, var(--accent-pink), var(--accent-light));
      color: white;
      display: inline-block;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 12px;
      margin: 16px 16px 6px;
    }
    .case-card h3 {
      padding: 0 16px;
      font-size: 20px;
      margin-bottom: 8px;
    }
    .case-desc {
      padding: 0 16px 20px;
      color: var(--text-gray);
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .case-waterfall { columns: 1; }
    }

    /* 方案对比 */
    .compare-row {
      display: flex;
      gap: 24px;
    }
    .compare-col {
      flex: 1;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      position: relative;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-subtle);
    }
    .compare-col.recommended {
      border: 2px solid var(--accent-pink);
    }
    .badge-recommend {
      position: absolute;
      top: -14px;
      right: 20px;
      background: var(--accent-pink);
      color: white;
      border-radius: 30px;
      padding: 6px 20px;
      font-size: 14px;
      font-weight: bold;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 0;
      border-bottom: 1px solid #eee;
    }
    .icon-check {
      color: var(--accent-pink);
      font-weight: bold;
    }
    .icon-minus {
      color: #aaa;
    }
    @media (max-width: 768px) {
      .compare-row { flex-direction: column; }
      .compare-col.recommended { order: -1; }
    }

    /* FAQ 手风琴双列 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px 32px;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      padding: 16px;
      border: 1px solid var(--border-subtle);
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
    }
    .faq-q-badge {
      background: var(--accent-pink);
      color: white;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding-left: 36px;
      color: var(--text-gray);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 10px;
    }
    @media (max-width: 768px) {
      .faq-grid { grid-template-columns: 1fr; }
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F4E 100%);
      border-radius: 40px;
      text-align: center;
      padding: 70px 24px;
      color: white;
      margin: 40px 0 0;
    }
    .cta-banner h2 {
      color: white;
      margin-bottom: 16px;
    }
    .cta-banner p {
      color: #ccc;
      margin-bottom: 32px;
    }

    /* Footer */
    .site-footer {
      background: var(--primary-deep);
      color: var(--text-light-gray);
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 30px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 800;
      color: white;
      margin-bottom: 12px;
    }
    .social-icons a {
      display: inline-block;
      margin-right: 14px;
      color: #aaa;
      font-size: 20px;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }