/* roulang page: index */
/* 全局设计变量与基础重置 */
    :root {
      --primary-deep: #1E2D2F;
      --accent-gold: #C49A6C;
      --accent-gold-hover: #A87D4E;
      --bg-warm: #FAF8F5;
      --cta-red: #B5452C;
      --cta-red-hover: #8B341F;
      --text-dark: #2C2C2C;
      --text-mid: #5C5C5C;
      --text-light: #B0B0B0;
      --white: #FFFFFF;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 4px 20px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-large: 12px;
      --font-serif: "Noto Serif SC", "STSong", serif;
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --max-width: 1200px;
      --section-padding: 100px 0;
      --mobile-padding: 60px 0;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 600;
      margin-top: 0;
    }

    h1 {
      font-size: 48px;
      line-height: 56px;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      line-height: 44px;
      color: var(--primary-deep);
      margin-bottom: 2rem;
      text-align: center;
    }

    h3 {
      font-size: 22px;
      line-height: 30px;
      color: var(--primary-deep);
      margin-bottom: 0.75rem;
    }

    p {
      color: var(--text-mid);
      margin-bottom: 1.5rem;
    }

    a {
      color: var(--accent-gold);
      text-decoration: none;
      transition: all 0.25s ease;
    }

    a:hover {
      text-decoration: underline;
      color: var(--accent-gold-hover);
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--accent-gold);
      color: var(--white);
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: background 0.25s ease, transform 0.2s;
      display: inline-block;
      text-decoration: none;
      cursor: pointer;
      box-shadow: 0 2px 6px rgba(0,0,0,0.08);
    }
    .btn-primary:hover {
      background: var(--accent-gold-hover);
      text-decoration: none;
      color: white;
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      color: var(--primary-deep);
      border: 1.5px solid var(--primary-deep);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: all 0.25s ease;
      display: inline-block;
      text-decoration: none;
    }
    .btn-secondary:hover {
      background: var(--primary-deep);
      color: white;
      text-decoration: none;
    }

    .btn-cta {
      background: var(--cta-red);
      color: white;
      border: none;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-size: 18px;
      font-weight: 600;
      letter-spacing: 0.5px;
      transition: background 0.25s ease, box-shadow 0.25s;
      display: inline-block;
      text-decoration: none;
      box-shadow: 0 4px 12px rgba(181,69,44,0.3);
    }
    .btn-cta:hover {
      background: var(--cta-red-hover);
      text-decoration: none;
      color: white;
      box-shadow: 0 6px 16px rgba(181,69,44,0.4);
    }

    .text-link {
      color: var(--accent-gold);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s;
    }
    .text-link:hover {
      text-decoration: underline;
      gap: 8px;
    }

    /* 导航系统 */
    .top-bar {
      background: var(--primary-deep);
      padding: 0;
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    .top-bar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
    }
    .logo {
      font-family: var(--font-serif);
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-gold);
      letter-spacing: 2px;
      padding: 14px 0;
      display: inline-block;
      text-decoration: none;
    }
    .logo:hover {
      color: var(--accent-gold);
      text-decoration: none;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      color: white;
      font-weight: 400;
      font-size: 15px;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: border-color 0.2s, color 0.2s;
      text-decoration: none;
    }
    .nav-links a:hover {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
      text-decoration: none;
    }
    .mega-menu-trigger {
      color: white;
      font-weight: 500;
      cursor: pointer;
      padding: 8px 12px;
      border-radius: 4px;
      transition: background 0.2s;
      position: relative;
    }
    .mega-menu-trigger:hover {
      background: rgba(255,255,255,0.1);
    }
    .mega-panel {
      position: absolute;
      right: 20px;
      top: 70px;
      background: white;
      width: 600px;
      max-width: 90vw;
      border-radius: 0 0 12px 12px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.15);
      display: none;
      padding: 24px;
      grid-template-columns: 2fr 1.5fr 1.5fr;
      gap: 24px;
      z-index: 200;
    }
    .mega-panel.active {
      display: grid;
    }
    .mega-col h4 {
      font-size: 16px;
      color: var(--primary-deep);
      margin-bottom: 12px;
      border-bottom: 1px solid #eee;
      padding-bottom: 6px;
    }
    .mega-col a {
      display: block;
      color: var(--text-mid);
      padding: 4px 0;
      font-size: 14px;
      text-decoration: none;
    }
    .mega-col a:hover {
      color: var(--accent-gold);
    }
    .mega-cta-card {
      background: var(--primary-deep);
      color: white;
      padding: 16px;
      border-radius: 8px;
      text-align: center;
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    .mega-cta-card::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(30,45,47,0.7);
    }
    .mega-cta-card span {
      position: relative;
      z-index: 1;
      font-weight: 600;
    }
    .hamburger {
      display: none;
      font-size: 24px;
      color: white;
      cursor: pointer;
    }
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: var(--primary-deep);
        position: absolute;
        width: 100%;
        left: 0;
        top: 64px;
        padding: 0 20px 20px;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        color: white;
        padding: 12px 0;
        border-bottom: 1px solid rgba(255,255,255,0.2);
      }
    }

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      padding: 120px 0;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(30,45,47,0.6);
    }
    .hero .container {
      position: relative;
      z-index: 2;
    }
    .hero h1 {
      color: white;
      margin-bottom: 1rem;
    }
    .hero .subtitle {
      color: var(--accent-gold);
      font-size: 20px;
      letter-spacing: 1px;
      margin-bottom: 2rem;
    }

    /* 通用板块 */
    section {
      padding: var(--section-padding);
    }
    @media (max-width: 640px) {
      section { padding: var(--mobile-padding); }
      h1 { font-size: 32px; line-height: 40px; }
      h2 { font-size: 26px; line-height: 34px; }
    }

    /* 卡片网格 */
    .grid-3, .grid-4, .grid-2 {
      display: grid;
      gap: 24px;
    }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    @media (max-width: 1024px) and (min-width: 641px) {
      .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-2 { grid-template-columns: 1fr; }
    }
    @media (max-width: 640px) {
      .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    }

    .card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      overflow: hidden;
    }
    .card:hover {
      box-shadow: var(--card-shadow-hover);
    }
    .card-img img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .card:hover .card-img img {
      transform: scale(1.03);
    }
    .card-body {
      padding: 20px;
    }

    /* 优势卡片特殊装饰 */
    .advantage-card {
      text-align: center;
      padding: 28px 16px;
      position: relative;
    }
    .advantage-card i {
      font-size: 48px;
      color: var(--accent-gold);
      margin-bottom: 16px;
    }
    .advantage-card::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 20%;
      width: 60%;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.3s, left 0.3s;
    }
    .advantage-card:hover::after {
      width: 100%;
      left: 0;
    }

    /* 数据区 */
    .data-section {
      background: var(--primary-deep);
      color: white;
    }
    .data-item {
      text-align: center;
    }
    .data-number {
      font-family: var(--font-serif);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-gold);
      margin-bottom: 8px;
    }
    .data-line {
      width: 40px;
      height: 2px;
      background: var(--accent-gold);
      margin: 8px auto;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 8px;
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 12px;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .faq-question.active {
      border-left-color: var(--accent-gold);
      background: #fcfaf7;
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-mid);
      display: none;
    }

    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer a {
      color: #ccc;
    }
    .footer a:hover {
      color: var(--accent-gold);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 40px;
      padding-top: 20px;
      font-size: 14px;
      text-align: center;
    }
    .disabled-link {
      cursor: default;
      opacity: 0.8;
    }