/* roulang page: index */
/* 现代CSS变量与设计系统 */
    :root {
      --primary: #0A0E27;
      --secondary: #D4AF37;
      --accent: #FF4D4F;
      --bg: #F5F3EE;
      --card-bg: #FFFFFF;
      --text: #1A1A1A;
      --text-soft: #5A5A5A;
      --border: #E0E0E0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: 0.35s ease-out;
      --container: 1280px;
      --header-height: 72px;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 段落与标题基础 */
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    h1 { font-size: 48px; letter-spacing: -0.5px; }
    h2 { font-size: 36px; }
    h3 { font-size: 24px; font-weight: 600; }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.3s;
    }

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

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      transition: all var(--transition);
      cursor: pointer;
      border: none;
      line-height: 1.2;
      text-align: center;
    }

    .btn-primary {
      background-color: var(--secondary);
      color: white;
      box-shadow: 0 4px 12px rgba(212, 175, 55, 0.25);
    }

    .btn-primary:hover {
      background-color: #B8960F;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(184, 150, 15, 0.3);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    /* 导航栏 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      height: var(--header-height);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      transition: box-shadow 0.3s;
    }

    .header.scrolled {
      box-shadow: 0 2px 20px rgba(0,0,0,0.04);
    }

    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-family: var(--font-serif);
      font-size: 26px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: baseline;
      gap: 6px;
      letter-spacing: 1px;
    }

    .logo span {
      color: var(--secondary);
      font-weight: 900;
      font-size: 28px;
    }

    .logo small {
      font-size: 14px;
      font-weight: 400;
      color: var(--text-soft);
      letter-spacing: 0.5px;
      margin-left: 4px;
      font-family: var(--font-sans);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 36px;
    }

    .nav-link {
      font-weight: 500;
      color: var(--text);
      font-size: 16px;
      position: relative;
      padding: 8px 0;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary);
      transition: width 0.3s;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .nav-cta {
      margin-left: 16px;
    }

    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--primary);
      cursor: pointer;
    }

    /* 移动端导航 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 400px;
      height: 100vh;
      background: var(--primary);
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 28px;
      z-index: 200;
      transition: right 0.4s ease;
      box-shadow: -10px 0 30px rgba(0,0,0,0.2);
    }

    .mobile-menu.active {
      right: 0;
    }

    .mobile-menu a {
      color: white;
      font-size: 22px;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 12px;
    }

    .close-menu {
      align-self: flex-end;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    /* 首屏Hero */
    .hero {
      position: relative;
      overflow: hidden;
      background-color: var(--bg);
      padding: 80px 0 120px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-content {
      flex: 0 0 55%;
    }

    .hero-content h1 {
      margin-bottom: 24px;
      font-weight: 900;
      color: var(--primary);
    }

    .hero-highlight {
      color: var(--secondary);
      position: relative;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-soft);
      margin-bottom: 40px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-visual {
      flex: 0 0 40%;
      position: relative;
    }

    .hero-img {
      width: 100%;
      border-radius: 24px;
      box-shadow: 0 25px 50px rgba(10,14,39,0.2);
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      background-color: #ddd;
    }

    .golden-geo {
      position: absolute;
      top: -30px;
      right: -30px;
      width: 180px;
      height: 180px;
      border: 3px solid rgba(212,175,55,0.25);
      border-radius: 50%;
      z-index: -1;
    }

    /* 板块标题 */
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-title h2 {
      margin-bottom: 12px;
    }

    .section-title p {
      color: var(--text-soft);
      font-size: 18px;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .pain-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      border-left: 4px solid transparent;
    }

    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-left-color: var(--secondary);
    }

    .pain-icon {
      font-size: 36px;
      color: var(--secondary);
      margin-bottom: 20px;
    }

    /* 解决方案卡片 (左对齐图文混排) */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      text-align: left;
    }

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

    .solution-icon {
      font-size: 44px;
      color: var(--secondary);
      margin-bottom: 24px;
      align-self: flex-start;
    }

    .solution-card h3 {
      margin-bottom: 12px;
    }

    .solution-card p {
      color: var(--text-soft);
      margin-bottom: 20px;
    }

    .arrow-link {
      font-weight: 600;
      color: var(--secondary);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap 0.3s;
    }

    .arrow-link:hover {
      gap: 12px;
    }

    /* 数据展示区 */
    .stats-band {
      background: var(--primary);
      color: white;
      padding: 80px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
      text-align: center;
    }

    .stat-item h3 {
      font-size: 42px;
      color: var(--secondary);
      margin-bottom: 8px;
    }

    /* 证言卡片 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .testimonial-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .testimonial-card::before {
      content: "“";
      font-size: 60px;
      color: var(--secondary);
      position: absolute;
      top: 10px;
      left: 20px;
      opacity: 0.4;
    }

    .testimonial-text {
      font-style: italic;
      margin-bottom: 20px;
      position: relative;
      z-index: 1;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 24px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-soft);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 16px;
    }

    .faq-item.active .faq-question i {
      transform: rotate(45deg);
    }

    /* CTA 区域 */
    .cta-section {
      background: linear-gradient(rgba(10,14,39,0.03), rgba(10,14,39,0.02));
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.8);
      padding: 80px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 50px;
    }

    .footer-brand p {
      margin-top: 16px;
      font-size: 15px;
      color: rgba(255,255,255,0.7);
    }

    .footer h4 {
      color: white;
      margin-bottom: 20px;
      font-size: 18px;
    }

    .footer a {
      color: rgba(255,255,255,0.7);
      display: block;
      margin-bottom: 12px;
      transition: color 0.3s;
    }

    .footer a:hover {
      color: var(--secondary);
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 24px;
      text-align: center;
      font-size: 15px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .hero-grid { flex-direction: column; }
      .hero-content { flex: auto; text-align: center; }
      .hero-sub { max-width: 100%; }
      .hero-buttons { justify-content: center; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      section { padding: 60px 0; }
      .pain-grid, .solution-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }