/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-gold: #C9A96E;
      --highlight-green: #00E5A0;
      --bg-warm: #F8F6F2;
      --card-white: #FFFFFF;
      --text-dark: #2B2B2B;
      --text-muted: #6B6B6B;
      --border-light: #D9D9D9;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-lg: 16px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --section-gap: 140px;
      --nav-width: 220px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      margin: 0;
      line-height: 1.7;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.3px;
    }

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

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

    .container {
      max-width: 1200px;
      padding-left: 24px;
      padding-right: 24px;
      margin-left: auto;
      margin-right: auto;
    }

    /* 左侧竖向导航 (桌面端) */
    .side-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background-color: var(--primary-deep);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 32px 0 24px;
      z-index: 1000;
      box-shadow: 2px 0 15px rgba(0,0,0,0.08);
      transition: transform 0.3s ease;
    }

    .nav-brand {
      padding: 0 24px 24px;
      border-bottom: 1px solid rgba(255,255,255,0.12);
      margin-bottom: 16px;
    }

    .logo-text {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-gold);
      letter-spacing: 1px;
      line-height: 1.2;
    }

    .nav-menu {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 6px;
      padding: 16px 0 0;
    }

    .nav-item {
      padding: 12px 24px;
      font-size: 16px;
      font-weight: 500;
      color: rgba(255,255,255,0.85);
      transition: all 0.25s ease;
      border-left: 3px solid transparent;
      display: block;
    }

    .nav-item:hover, .nav-item.active {
      color: var(--accent-gold);
      background-color: rgba(255,255,255,0.05);
      border-left: 3px solid var(--accent-gold);
    }

    .nav-footer {
      padding: 0 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .social-icons {
      display: flex;
      gap: 18px;
      font-size: 18px;
    }

    .social-icons a {
      color: rgba(255,255,255,0.6);
      transition: color 0.2s;
    }

    .social-icons a:hover {
      color: var(--accent-gold);
    }

    .copyright-side {
      font-size: 12px;
      color: rgba(255,255,255,0.5);
    }

    /* 主内容区偏移 */
    .main-content {
      margin-left: var(--nav-width);
      width: calc(100% - var(--nav-width));
    }

    /* 移动端顶部导航 */
    .mobile-nav {
      display: none;
      background-color: var(--primary-deep);
      padding: 16px 20px;
      align-items: center;
      justify-content: space-between;
      position: sticky;
      top: 0;
      z-index: 999;
    }

    .mobile-logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--accent-gold);
    }

    .hamburger {
      font-size: 24px;
      color: white;
      background: none;
      border: none;
    }

    .mobile-menu-list {
      display: none;
      flex-direction: column;
      background: var(--primary-deep);
      padding: 0 20px 16px;
    }

    .mobile-menu-list a {
      padding: 12px 0;
      color: rgba(255,255,255,0.9);
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .mobile-menu-list a:hover {
      color: var(--accent-gold);
    }

    /* Hero区域 */
    .hero-section {
      background: radial-gradient(circle at 30% 30%, #1a1f3a, #0A0E27);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero-bg-particles {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.2;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      color: white;
      padding: 60px 0;
    }

    .hero-title {
      font-size: 52px;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 22px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
    }

    .btn-gold {
      background: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      border: none;
      transition: all 0.25s;
      font-size: 18px;
      box-shadow: 0 4px 12px rgba(201,169,110,0.3);
    }

    .btn-gold:hover {
      background: #b8964a;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(184,150,74,0.4);
    }

    /* 通用板块 */
    .section-block {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 38px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 16px;
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 48px;
    }

    /* 指标卡片 */
    .metric-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: 0.3s ease;
    }

    .metric-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .metric-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--highlight-green);
      line-height: 1.1;
    }

    .metric-label {
      color: var(--text-muted);
      font-size: 16px;
      margin-top: 8px;
    }

    /* 服务卡片 */
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }

    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }

    .service-icon {
      width: 64px;
      height: 64px;
      background: rgba(201,169,110,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-gold);
      font-size: 28px;
      margin-bottom: 24px;
    }

    /* 对比区 */
    .compare-badge {
      background: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 700;
      width: 64px;
      height: 64px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin: 0 auto;
    }

    .compare-list li {
      list-style: none;
      padding: 10px 0;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .text-green {
      color: var(--highlight-green);
    }

    .text-muted-red {
      color: #b88;
    }

    /* FAQ手风琴 */
    .accordion-button {
      background: #F8F6F2;
      font-weight: 600;
      color: var(--primary-deep);
      box-shadow: none;
    }

    .accordion-button:not(.collapsed) {
      background: #EFECE6;
      color: var(--accent-gold);
    }

    /* 表单 */
    .form-control {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      padding: 14px 16px;
    }

    .form-control:focus {
      border-color: var(--primary-deep);
      box-shadow: 0 0 0 3px rgba(10,14,39,0.1);
    }

    .footer-custom {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }

    @media (max-width: 991px) {
      .side-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
      }
    }