/* roulang page: index */
:root {
      --primary-gold: #8B6914;
      --accent-gold: #C49A3C;
      --deep-blue: #1E2B3C;
      --warm-white: #F7F3EB;
      --text-dark: #2C2C2C;
      --text-muted: #5A5A5A;
      --card-bg: #FFFFFF;
      --border-light: rgba(255,255,255,0.2);
      --shadow-card: 0 8px 30px rgba(30,43,60,0.06);
      --shadow-hover: 0 16px 40px rgba(30,43,60,0.12);
      --shadow-badge: 0 4px 12px rgba(139,105,20,0.15);
      --radius-card: 20px;
      --radius-btn: 30px;
      --radius-input: 12px;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-dark);
      margin: 0;
      line-height: 1.5;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    /* 左侧竖向导航 (桌面) */
    .side-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 260px;
      height: 100vh;
      background-color: var(--deep-blue);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      z-index: 1030;
      padding: 2rem 1.5rem;
      box-shadow: 4px 0 20px rgba(0,0,0,0.08);
      background-image: linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
      background-size: 20px 100%;
    }
    .brand-area {
      text-align: left;
    }
    .brand-logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-gold);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-logo i {
      font-size: 26px;
      color: var(--accent-gold);
    }
    .brand-slogan {
      font-size: 13px;
      color: #B0B8C1;
      margin-top: 4px;
      font-weight: 400;
    }
    .nav-menu {
      list-style: none;
      padding: 0;
      margin: 2rem 0;
      flex: 1;
    }
    .nav-item {
      margin-bottom: 14px;
    }
    .nav-link {
      display: block;
      color: #B0B8C1;
      font-size: 16px;
      font-weight: 500;
      padding: 10px 14px;
      border-radius: 8px;
      transition: var(--transition);
      position: relative;
      letter-spacing: 0.3px;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-gold);
      background-color: rgba(255,255,255,0.05);
      border-left: 3px solid var(--accent-gold);
      padding-left: 11px;
    }
    .nav-contact {
      color: #B0B8C1;
      font-size: 14px;
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 1.2rem;
    }
    .nav-contact i {
      color: var(--accent-gold);
      margin-right: 6px;
    }
    /* 主内容区域 */
    .main-content {
      margin-left: 260px;
      width: calc(100% - 260px);
    }
    /* 移动端顶部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: var(--deep-blue);
      z-index: 1040;
      align-items: center;
      justify-content: space-between;
      padding: 0 1.5rem;
      box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    }
    .mobile-logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--accent-gold);
    }
    .hamburger {
      color: var(--accent-gold);
      font-size: 24px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .mobile-menu {
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: var(--deep-blue);
      display: none;
      flex-direction: column;
      align-items: center;
      padding: 2rem 0;
      z-index: 1035;
    }
    .mobile-menu a {
      color: #B0B8C1;
      font-size: 20px;
      padding: 12px 0;
      display: block;
      width: 100%;
      text-align: center;
    }
    .mobile-menu a:hover {
      color: var(--accent-gold);
    }
    /* 通用区块 */
    .section-block {
      padding: 100px 0;
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    h2.section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--deep-blue);
      margin-bottom: 0.5rem;
      position: relative;
      display: inline-block;
    }
    h2.section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--primary-gold);
      margin-top: 8px;
    }
    .section-subtitle {
      font-size: 20px;
      color: var(--text-muted);
      max-width: 700px;
      margin: 1rem auto 3rem;
    }
    .btn-gold {
      background: var(--accent-gold);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      border: none;
      transition: var(--transition);
    }
    .btn-gold:hover {
      background: var(--primary-gold);
      color: white;
    }
    .btn-outline-gold {
      background: transparent;
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-gold:hover {
      background: var(--accent-gold);
      color: var(--deep-blue);
    }
    .card-custom {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: none;
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .badge-gold {
      background: rgba(139,105,20,0.1);
      color: var(--primary-gold);
      font-weight: 500;
      border-radius: 20px;
      padding: 4px 12px;
    }
    /* Hero */
    #hero {
      background: var(--deep-blue);
      background-image: linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 25px 100%;
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      color: white;
    }
    .data-badge {
      background: rgba(255,255,255,0.08);
      border-radius: 12px;
      padding: 12px 20px;
      color: var(--accent-gold);
      font-weight: 700;
    }
    /* 场景交替 */
    .scenario-row {
      align-items: center;
      margin-bottom: 3rem;
    }
    .scenario-img {
      border-radius: 24px;
      object-fit: cover;
      width: 100%;
      height: 280px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    }
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      color: var(--deep-blue);
      background: transparent;
      font-size: 18px;
      border-bottom: 1px solid #E0D8CC;
      border-radius: 0 !important;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary-gold);
      background: transparent;
    }
    .accordion-item {
      border: none;
      background: transparent;
    }
    /* 表单 */
    .form-control, .form-select {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      color: white;
      border-radius: var(--radius-input);
      padding: 14px;
    }
    .form-control:focus {
      border-color: var(--accent-gold);
      box-shadow: 0 0 0 0.2rem rgba(196,154,60,0.25);
    }
    footer {
      background: var(--deep-blue);
      color: #B0B8C1;
    }
    @media (max-width: 992px) {
      .side-nav {
        display: none;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
      }
      .mobile-nav {
        display: flex;
      }
      .section-block {
        padding: 70px 0;
      }
      h1 {
        font-size: 32px !important;
      }
      h2.section-title {
        font-size: 28px;
      }
    }