/* roulang page: index */
:root {
      --primary-deep-blue: #1A2744;
      --accent-gold: #C8A96E;
      --bg-warm-white: #FAF9F7;
      --text-charcoal: #2C2C2C;
      --text-rock-gray: #5C5C5C;
      --text-light-gray: #8C8C8C;
      --border-light: #E8E5E0;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 12px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --nav-width: 240px;
      --transition-smooth: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
      background-color: var(--bg-warm-white);
      color: var(--text-charcoal);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
      display: flex;
      min-height: 100vh;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      transition: var(--transition-smooth);
    }
    input {
      font-family: inherit;
      font-size: 16px;
    }
    h1, h2, h3 {
      font-weight: 600;
      line-height: 1.3;
    }
    .app-container {
      display: flex;
      width: 100%;
      min-height: 100vh;
    }
    /* 左侧固定导航 */
    .side-nav {
      width: var(--nav-width);
      min-width: var(--nav-width);
      height: 100vh;
      position: fixed;
      left: 0;
      top: 0;
      background-color: var(--primary-deep-blue);
      color: white;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 2rem 1.5rem;
      z-index: 30;
      box-shadow: 2px 0 15px rgba(0,0,0,0.08);
    }
    .logo-area {
      margin-bottom: 3rem;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo-text i {
      color: var(--accent-gold);
      font-size: 2rem;
    }
    .logo-sub {
      font-size: 0.9rem;
      color: var(--accent-gold);
      margin-top: 0.3rem;
      letter-spacing: 1px;
    }
    .nav-menu {
      display: flex;
      flex-direction: column;
      gap: 1.8rem;
      margin-top: 2rem;
    }
    .nav-item {
      color: rgba(255,255,255,0.8);
      font-size: 1.1rem;
      font-weight: 400;
      padding-left: 0.8rem;
      border-left: 3px solid transparent;
      transition: var(--transition-smooth);
      display: flex;
      align-items: center;
      gap: 0.8rem;
    }
    .nav-item i {
      font-size: 1rem;
      width: 20px;
      color: rgba(255,255,255,0.6);
      transition: var(--transition-smooth);
    }
    .nav-item:hover, .nav-item.active {
      color: var(--accent-gold);
      border-left-color: var(--accent-gold);
    }
    .nav-item:hover i, .nav-item.active i {
      color: var(--accent-gold);
    }
    .nav-footer {
      font-size: 0.8rem;
      color: rgba(255,255,255,0.5);
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 1.5rem;
      margin-top: auto;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      background: transparent;
      border: none;
    }
    /* 移动端抽屉 */
    .mobile-nav-overlay {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.6);
      z-index: 40;
    }
    .mobile-drawer {
      position: fixed;
      top: 0;
      left: -280px;
      width: 280px;
      height: 100%;
      background: var(--primary-deep-blue);
      z-index: 50;
      transition: left 0.3s ease;
      padding: 2rem 1.5rem;
      display: flex;
      flex-direction: column;
    }
    .mobile-drawer.open {
      left: 0;
    }
    .mobile-nav-item {
      color: white;
      padding: 1rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    /* 主内容区 */
    .main-content {
      margin-left: var(--nav-width);
      width: calc(100% - var(--nav-width));
      flex: 1;
    }
    .mobile-header {
      display: none;
      background: var(--primary-deep-blue);
      color: white;
      padding: 1rem 1.5rem;
      position: sticky;
      top: 0;
      z-index: 25;
      align-items: center;
      justify-content: space-between;
    }
    section {
      padding: 6rem 3rem;
    }
    .container-narrow {
      max-width: 1100px;
      margin: 0 auto;
    }
    .btn-primary {
      background: var(--primary-deep-blue);
      color: white;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 10px rgba(26,39,68,0.2);
    }
    .btn-primary:hover {
      background: var(--accent-gold);
      color: #1A2744;
      box-shadow: 0 8px 20px rgba(200,169,110,0.3);
    }
    .btn-outline {
      border: 2px solid var(--primary-deep-blue);
      color: var(--primary-deep-blue);
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(26,39,68,0.05);
    }
    .section-title {
      font-size: 2.4rem;
      color: var(--primary-deep-blue);
      margin-bottom: 0.8rem;
    }
    .gold-line {
      width: 60px;
      height: 3px;
      background: var(--accent-gold);
      margin: 1rem 0 2rem;
    }
    .card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
    }
    /* Hero */
    .hero {
      background: linear-gradient(90deg, rgba(26,39,68,0.08) 0%, rgba(250,249,247,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
    }
    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: var(--primary-deep-blue);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-rock-gray);
    }
    .footer {
      background: var(--primary-deep-blue);
      color: white;
      padding: 3rem;
    }
    @media (max-width: 1024px) {
      .side-nav {
        display: none;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
      }
      .mobile-header {
        display: flex;
      }
      .mobile-nav-overlay, .mobile-drawer {
        display: block;
      }
      section {
        padding: 4rem 1.5rem;
      }
      .hero h1 {
        font-size: 2.5rem;
      }
    }