/* roulang page: index */
:root {
      --primary: #E6392A;
      --primary-dark: #C62828;
      --secondary: #1D1D1F;
      --accent: #F4A261;
      --bg-warm: #FAFAF5;
      --bg-dark: #1D1D1F;
      --bg-dark-alt: #2B2B2F;
      --card-bg: #FFFFFF;
      --card-border: #E8E8E6;
      --text-dark: #1D1D1F;
      --text-body: #444444;
      --text-muted: #666666;
      --text-light: #999999;
      --white: #FFFFFF;
      --font-serif: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", "SF Pro Display", "Helvetica Neue", sans-serif;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.04);
      --shadow-hover: 0 18px 40px rgba(0,0,0,0.08);
      --shadow-btn: 0 8px 18px rgba(230,57,42,0.28);
      --radius-card: 20px;
      --radius-btn: 10px;
      --radius-input: 10px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: var(--font-serif);
      background-color: var(--white);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, input, textarea {
      font-family: var(--font-serif);
      font-size: 16px;
      border: none;
      outline: none;
      background: transparent;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      cursor: pointer;
      padding: 14px 34px;
      font-size: 16px;
      letter-spacing: 0.3px;
      background: var(--primary);
      color: var(--white);
      box-shadow: var(--shadow-btn);
      border: 2px solid transparent;
      text-align: center;
    }

    .btn:hover {
      background: var(--primary-dark);
      transform: translateY(-3px);
      box-shadow: 0 14px 24px rgba(230,57,42,0.35);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      box-shadow: none;
    }

    .btn-outline:hover {
      background: rgba(230,57,42,0.08);
      transform: translateY(-3px);
    }

    .btn-accent {
      background: var(--accent);
      color: #1D1D1F;
      box-shadow: 0 6px 16px rgba(244,162,97,0.3);
      font-weight: 700;
      border: none;
    }

    .btn-accent:hover {
      background: #e08c3a;
      color: #fff;
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      padding: 18px 0;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo span {
      background: var(--primary);
      color: white;
      border-radius: 40px;
      padding: 4px 12px;
      font-size: 18px;
      letter-spacing: 0.2px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 38px;
      font-weight: 500;
      color: #3b3b3b;
    }

    .nav-menu a {
      position: relative;
      padding: 6px 0;
      transition: var(--transition);
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2.5px;
      background: var(--primary);
      border-radius: 4px;
      transition: 0.25s;
    }

    .nav-menu a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--secondary);
      border-radius: 6px;
      transition: 0.2s;
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .nav-menu { gap: 20px; font-size: 15px; }
    }

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 75px;
        right: -100%;
        flex-direction: column;
        background: white;
        width: 70%;
        height: 100vh;
        padding: 40px;
        gap: 28px;
        box-shadow: -10px 0 30px rgba(0,0,0,0.08);
        transition: 0.3s;
        align-items: flex-start;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: flex;
      }
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 44px;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }
    .section-title .divider {
      width: 75px;
      height: 4px;
      background: var(--primary);
      margin: 18px auto 0;
      border-radius: 8px;
    }

    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(0,0,0,0.75) 15%, rgba(0,0,0,0.45) 65%);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero h1 {
      font-size: 60px;
      font-weight: 800;
      line-height: 1.2;
      color: white;
    }
    .hero h1 .highlight {
      color: var(--accent);
      border-bottom: 3px solid var(--primary);
    }
    .hero-sub {
      font-size: 20px;
      color: rgba(255,255,255,0.8);
      margin: 28px 0;
      max-width: 80%;
    }

    @media (max-width: 880px) {
      .hero { height: auto; padding: 140px 0 80px; }
      .hero .container { grid-template-columns: 1fr; }
      .hero h1 { font-size: 42px; }
    }

    /* 优势错落网格 */
    .advantages-bg { background: #F7F7F2; }
    .advance-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .adv-card {
      background: white;
      padding: 45px 30px;
      border-radius: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .adv-card:nth-child(2) { margin-top: -24px; }
    .adv-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-hover); }
    .adv-icon { font-size: 40px; color: var(--primary); margin-bottom: 26px; }
    .adv-card h3 { font-size: 24px; font-weight: 700; margin-bottom: 14px; }

    @media (max-width: 768px) {
      .advance-grid { grid-template-columns: 1fr; }
      .adv-card:nth-child(2) { margin-top: 0; }
    }

    /* 数据看板 */
    .stats {
      background: var(--bg-dark);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 30px;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 55px;
      font-weight: 800;
      color: var(--accent);
    }

    /* 服务卡片 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .service-img {
      height: 220px;
      background-size: cover;
      background-position: center;
    }
    .service-body { padding: 28px; }
    .service-body h3 { font-size: 24px; }

    @media (max-width: 768px) {
      .service-grid, .stats-grid { grid-template-columns: 1fr; }
    }

    .faq-container { max-width: 860px; margin: 0 auto; }
    .faq-item {
      background: white;
      border: 1px solid #ececec;
      border-radius: 16px;
      margin-bottom: 14px;
      padding: 0 26px;
      overflow: hidden;
    }
    .faq-question {
      padding: 22px 0;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.35s;
      color: #444;
    }

    .cta-section {
      background: var(--bg-dark);
      color: white;
    }
    .cta-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .footer {
      background: #111113;
      color: #999;
      padding: 60px 0 30px;
    }

    button:focus-visible, a:focus-visible {
      outline: 3px solid var(--primary);
      outline-offset: 3px;
    }