/* roulang page: index */
:root {
      --primary-deep: #0A4D3C;
      --primary-mid: #2E8B57;
      --primary-light: #7CCD7C;
      --accent-neon: #C8FF00;
      --paper-white: #F9F7F2;
      --ink-black: #1C1C1C;
      --ink-gray: #4A4A4A;
      --pure-white: #FFFFFF;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 10px 30px -10px rgba(0,0,0,0.05);
      --shadow-hover: 0 24px 44px -12px rgba(0,0,0,0.12);
      --radius-xl: 28px;
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-pill: 50px;
      --radius-sm: 12px;
      --transition-smooth: all 0.3s cubic-bezier(0.2, 0.0, 0, 1);
      --container-max: 1320px;
      --section-padding: 100px 0;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--paper-white);
      color: var(--ink-black);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

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

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

    button, input {
      font-family: 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%;
      z-index: 1000;
      background: rgba(249, 247, 242, 0.8);
      backdrop-filter: blur(16px);
      transition: var(--transition-smooth);
      border-bottom: 1px solid transparent;
    }

    .header.scrolled {
      background: rgba(255, 255, 255, 0.98);
      box-shadow: 0 6px 20px rgba(0,0,0,0.03);
      border-bottom-color: rgba(0,0,0,0.04);
    }

    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
      flex-wrap: wrap;
    }

    .logo {
      font-family: var(--font-serif);
      font-weight: 900;
      font-size: 1.8rem;
      letter-spacing: 0.5px;
      background: linear-gradient(135deg, var(--primary-deep) 0%, var(--primary-mid) 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      background: none;
      -webkit-text-fill-color: var(--primary-deep);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--ink-black);
    }
    .nav-links a {
      position: relative;
      padding: 6px 0;
      font-size: 0.95rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-neon);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-subscribe {
      background: linear-gradient(135deg, var(--primary-deep), var(--primary-mid));
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 0.4px;
      box-shadow: 0 8px 18px rgba(10,77,60,0.2);
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
    }
    .btn-subscribe:hover {
      background: linear-gradient(135deg, #0b5e4a, #239f5b);
      box-shadow: 0 12px 24px rgba(10,77,60,0.35);
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      font-size: 1.6rem;
      color: var(--primary-deep);
    }

    /* 首屏 Hero */
    .hero {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 20% 30%, rgba(46,139,87,0.08) 0%, rgba(249,247,242,0) 70%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
    }
    .hero-content {
      flex: 1;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      background: rgba(200, 255, 0, 0.18);
      color: var(--primary-deep);
      font-weight: 700;
      font-size: 0.8rem;
      padding: 6px 16px;
      border-radius: 30px;
      letter-spacing: 0.4px;
      margin-bottom: 24px;
      gap: 6px;
    }
    .hero-badge i {
      font-size: 0.9rem;
    }
    h1 {
      font-family: var(--font-serif);
      font-size: clamp(2.6rem, 6vw, 4.6rem);
      font-weight: 900;
      line-height: 1.12;
      letter-spacing: -0.02em;
      background: linear-gradient(135deg, #0A4D3C 0%, #2E8B57 70%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--ink-gray);
      margin-bottom: 28px;
      max-width: 500px;
      font-weight: 400;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin: 28px 0 36px;
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-deep);
      font-family: var(--font-serif);
    }
    .stat-label {
      font-size: 0.85rem;
      color: var(--ink-gray);
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-deep), var(--primary-mid));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      font-size: 1rem;
      box-shadow: 0 10px 20px rgba(10,77,60,0.25);
      transition: var(--transition-smooth);
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1.5px solid var(--ink-black);
      color: var(--ink-black);
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      background: transparent;
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: rgba(10,77,60,0.05);
      border-color: var(--primary-deep);
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-xl);
      min-height: 380px;
      box-shadow: var(--shadow-card);
    }

    /* 亮点 Bento */
    .section-title {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-family: var(--font-serif);
      font-size: clamp(2rem, 4vw, 2.8rem);
      font-weight: 700;
      color: var(--ink-black);
    }
    .title-bar {
      width: 6px;
      height: 38px;
      background: var(--accent-neon);
      border-radius: 4px;
    }

    .bento-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .bento-card {
      background: var(--pure-white);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }
    .bento-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .card-large {
      grid-column: span 2;
      background: linear-gradient(105deg, #f4f9f4 0%, #ffffff 100%);
    }
    .card-img {
      height: 140px;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-md);
      margin-bottom: 18px;
    }
    .bento-card h3 {
      font-size: 1.4rem;
      font-weight: 700;
      margin: 10px 0 8px;
    }
    .bento-card p {
      color: var(--ink-gray);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    /* 案例瀑布流 */
    .masonry-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 28px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      position: relative;
    }
    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-meta {
      padding: 20px;
    }
    .case-date {
      font-size: 0.75rem;
      color: var(--primary-mid);
      font-weight: 600;
    }
    .case-card h3 {
      font-weight: 700;
      margin: 6px 0;
    }

    /* 对比区 */
    .compare-panel {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .compare-col.negative {
      background: #f5f5f0;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 14px 0;
    }

    /* FAQ */
    .faq-grid {
      display: flex;
      gap: 32px;
    }
    .faq-categories {
      flex: 0 0 180px;
    }
    .faq-list {
      flex: 1;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      padding: 18px 22px;
      margin-bottom: 12px;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }

    .footer {
      background: #0f2e26;
      color: #e0e8e4;
      padding: 70px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    .footer input {
      background: rgba(255,255,255,0.1);
      border-radius: 50px;
      padding: 12px 18px;
      color: white;
      width: 100%;
    }

    @media (max-width: 768px) {
      .nav-links, .nav-actions .btn-subscribe {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-grid {
        flex-direction: column;
      }
      .bento-grid {
        grid-template-columns: 1fr;
      }
      .card-large {
        grid-column: span 1;
      }
      .faq-grid {
        flex-direction: column;
      }
    }