/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-deep: #153029;
      --accent: #C8A96E;
      --cta: #E85D3A;
      --bg: #FBF8F4;
      --card-bg: #FFFFFF;
      --text-main: #2C2C2C;
      --text-soft: #5A5A5A;
      --text-weak: #8A8A8A;
      --border: #E5E0D8;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 16px rgba(26,60,52,0.06);
      --shadow-hover: 0 8px 32px rgba(26,60,52,0.10);
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
      --font-sans: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
      --transition: all 0.25s ease;
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
      background: transparent;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(251, 248, 244, 0.92);
      backdrop-filter: blur(12px);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      transition: var(--transition);
      border-bottom: 1px solid transparent;
    }

    .header.scrolled {
      box-shadow: 0 2px 16px rgba(26,60,52,0.06);
      border-bottom-color: var(--border);
    }

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

    .logo {
      font-family: var(--font-serif);
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }

    .logo .dot {
      color: var(--accent);
      font-size: 1.8rem;
      margin: 0 2px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 100%;
      height: 2px;
      background: var(--accent);
      transform: scaleX(0);
      transform-origin: right;
      transition: transform 0.3s ease;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      transform: scaleX(1);
      transform-origin: left;
    }

    .burger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      padding: 8px;
      z-index: 110;
    }

    .burger span {
      display: block;
      width: 28px;
      height: 2.5px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 100%;
      height: 100vh;
      background: var(--bg);
      z-index: 105;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      transition: right 0.4s ease;
      font-size: 1.5rem;
    }

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

    .mobile-menu .nav-link {
      font-size: 1.8rem;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      background: var(--bg);
      position: relative;
      overflow: hidden;
    }

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

    .hero-text {
      flex: 1 1 50%;
    }

    .hero h1 {
      font-family: var(--font-serif);
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero .subtitle {
      font-size: 18px;
      color: var(--text-soft);
      margin-bottom: 32px;
      max-width: 480px;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      cursor: pointer;
      text-align: center;
    }

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

    .btn-primary:hover {
      background: var(--primary-deep);
      transform: scale(1.02);
    }

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

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

    .btn-cta {
      background: var(--cta);
      color: white;
      font-size: 18px;
    }

    .btn-cta:hover {
      filter: brightness(1.08);
      transform: scale(1.02);
    }

    .hero-image {
      flex: 1 1 45%;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      position: relative;
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    .geometric-bg {
      position: absolute;
      right: 0;
      bottom: 0;
      width: 320px;
      height: 320px;
      background: radial-gradient(circle at 100% 100%, rgba(200,169,110,0.08) 0%, transparent 70%);
      pointer-events: none;
    }

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

    .section-title {
      font-family: var(--font-serif);
      font-size: 36px;
      font-weight: 600;
      line-height: 1.3;
      text-align: center;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .section-desc {
      text-align: center;
      color: var(--text-soft);
      max-width: 640px;
      margin: 0 auto 56px;
      font-size: 18px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

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

    .card.pain {
      border-top-color: var(--cta);
    }

    .card-icon {
      width: 64px;
      height: 64px;
      background: rgba(200,169,110,0.12);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent);
      font-size: 28px;
    }

    .card h3 {
      font-family: var(--font-serif);
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .card p {
      color: var(--text-soft);
    }

    /* 解决方案卡片 */
    .solution-card img {
      width: 100%;
      aspect-ratio: 16/10;
      object-fit: cover;
      border-radius: 10px;
      margin-bottom: 20px;
      transition: transform 0.3s ease;
    }

    .solution-card:hover img {
      transform: scale(1.02);
    }

    .arrow-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--primary);
      font-weight: 600;
      margin-top: 12px;
      transition: var(--transition);
    }

    .arrow-link:hover {
      gap: 12px;
      color: var(--accent);
    }

    /* 数据深色块 */
    .stats {
      background: var(--primary);
      color: white;
      padding: 90px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--accent);
      font-family: var(--font-serif);
    }

    .stat-label {
      font-size: 16px;
      color: rgba(255,255,255,0.8);
      margin-top: 8px;
    }

    /* 证言 */
    .testimonials {
      background: #F5F0EA;
    }

    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .quote-icon {
      font-size: 36px;
      color: var(--accent);
      opacity: 0.5;
      margin-bottom: 16px;
    }

    .testimonial-text {
      font-style: italic;
      font-size: 18px;
      color: var(--text-main);
      margin-bottom: 24px;
    }

    .author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      background: #D9CFC0;
      border-radius: 50%;
      flex-shrink: 0;
    }

    .author-info strong {
      display: block;
      font-weight: 600;
    }

    .author-info span {
      color: var(--text-weak);
      font-size: 14px;
    }

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

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }

    .faq-question {
      font-family: var(--font-serif);
      font-size: 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: var(--transition);
    }

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

    .faq-item.open .faq-answer {
      max-height: 300px;
      padding-top: 16px;
    }

    .faq-toggle {
      font-size: 24px;
      color: var(--accent);
    }

    /* 终局 CTA */
    .cta-section {
      background: linear-gradient(135deg, #1A3C34 0%, #2A5A4E 100%);
      color: white;
      padding: 100px 0;
      text-align: center;
    }

    .cta-form {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 32px;
    }

    .cta-form input {
      padding: 14px 20px;
      border-radius: var(--radius-btn);
      border: 1px solid rgba(255,255,255,0.3);
      background: rgba(255,255,255,0.1);
      color: white;
      min-width: 220px;
    }

    .cta-form input::placeholder {
      color: rgba(255,255,255,0.6);
    }

    /* 页脚 */
    .footer {
      background: #F5F0EA;
      padding: 60px 0 30px;
    }

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

    .footer h4 {
      font-weight: 600;
      margin-bottom: 16px;
    }

    .footer a {
      display: block;
      color: var(--text-soft);
      margin: 8px 0;
    }

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

    .copyright {
      border-top: 1px solid var(--border);
      margin-top: 48px;
      padding-top: 24px;
      text-align: center;
      color: var(--text-weak);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-3, .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .burger { display: flex; }
      .hero .container { flex-direction: column; }
      .hero h1 { font-size: 32px; }
      .section-title { font-size: 26px; }
      .grid-3, .testimonial-grid { grid-template-columns: 1fr; }
      .hero { padding: 120px 0 64px; }
      section { padding: 64px 0; }
    }

    @media (max-width: 480px) {
      .footer-grid { grid-template-columns: 1fr; }
      .cta-form { flex-direction: column; align-items: center; }
    }