/* roulang page: index */
:root {
      --primary: #0B3B60;
      --primary-hover: #092F4D;
      --accent: #2A9D8F;
      --accent-light: rgba(42,157,143,0.12);
      --bg: #F7F9FC;
      --surface: #FFFFFF;
      --text-title: #0B1E2F;
      --text-body: #3A4A5A;
      --text-muted: #6F7B8A;
      --border-light: #E0E6ED;
      --border-input: #D0D7DE;
      --shadow-sm: 0 8px 24px rgba(11,59,96,0.08);
      --shadow-hover: 0 12px 32px rgba(11,59,96,0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --glass-bg: rgba(255,255,255,0.72);
      --glass-blur: blur(16px);
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.5;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ---------- 玻璃沉浸导航 ---------- */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border-bottom: 1px solid rgba(255,255,255,0.35);
      box-shadow: 0 4px 12px rgba(11,59,96,0.06);
      transition: background 0.3s, box-shadow 0.3s;
    }

    .glass-nav.scrolled {
      background: rgba(247,249,252,0.96);
      box-shadow: 0 6px 20px rgba(11,59,96,0.1);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent);
      font-size: 1.9rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -4px;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 0.5rem 1.25rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      margin-left: 0.5rem;
      box-shadow: 0 4px 10px rgba(11,59,96,0.2);
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      color: white;
      box-shadow: 0 6px 14px rgba(11,59,96,0.25);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }

    /* ---------- 板块间距 ---------- */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 1rem;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
    }

    /* ---------- Hero ---------- */
    .hero {
      background: linear-gradient(135deg, rgba(11,59,96,0.78) 0%, rgba(11,59,96,0.35) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      padding-top: 72px;
    }

    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 2.5rem;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 2.9rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero p {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2rem;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      box-shadow: 0 8px 18px rgba(42,157,143,0.3);
      transition: var(--transition);
    }
    .btn-accent:hover {
      background: #238b7e;
      color: white;
      box-shadow: 0 10px 22px rgba(42,157,143,0.4);
      transform: translateY(-2px);
    }
    .hero-image {
      flex: 1 1 400px;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.25);
    }

    /* ---------- 按钮系统 ---------- */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 0.75rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      box-shadow: 0 4px 10px rgba(11,59,96,0.2);
      transition: var(--transition);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      color: white;
      box-shadow: 0 8px 16px rgba(11,59,96,0.25);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(11,59,96,0.06);
      color: var(--primary);
    }

    /* ---------- 卡片 ---------- */
    .card {
      background: var(--surface);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 2rem 1.5rem;
      transition: var(--transition);
      height: 100%;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-box {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 1.2rem;
    }

    /* ---------- 痛点/解决方案图文 ---------- */
    .alt-row {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 3rem;
    }
    .alt-text {
      flex: 1 1 400px;
    }
    .alt-img {
      flex: 1 1 380px;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    /* ---------- 数据大字 ---------- */
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }

    /* ---------- 证言 ---------- */
    .testimonial-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
    }
    .quote-mark {
      font-size: 3rem;
      color: rgba(11,59,96,0.2);
      font-weight: 700;
      line-height: 1;
    }

    /* ---------- FAQ ---------- */
    .accordion-faq .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.2rem 0;
      color: var(--text-title);
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    .faq-answer.open {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }

    /* ---------- Footer ---------- */
    .footer-dark {
      background: #0B1E2F;
      color: #B0C4D8;
      padding: 4rem 0 1.5rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
    }
    .footer-dark a {
      color: #B0C4D8;
    }
    .footer-dark a:hover {
      color: white;
    }

    /* ---------- 响应式 ---------- */
    @media (max-width: 1024px) {
      .hero h1 { font-size: 2.2rem; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-content { flex-direction: column; }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
      .alt-row { flex-direction: column; }
      section { padding: 60px 0; }
    }
    @media (max-width: 640px) {
      .container { padding: 0 16px; }
      .hero h1 { font-size: 1.9rem; }
      .footer-grid { grid-template-columns: 1fr; }
      .card, .testimonial-card { margin-bottom: 1.2rem; }
    }

    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      padding: 1rem;
      border-radius: 12px;
      margin-top: 0.5rem;
    }
    .mobile-menu a {
      padding: 0.75rem;
      border-bottom: 1px solid #eee;
    }