/* roulang page: index */
:root {
      --primary-deep: #0B2B1F;
      --accent-gold: #C8A951;
      --highlight-green: #00E676;
      --bg-warm: #FAFAF8;
      --dark-block: #0B1A12;
      --text-main: #1A1A1A;
      --text-muted: #5C5C5C;
      --border-light: rgba(0,0,0,0.04);
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 4px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'Noto Serif SC', 'PingFang SC', 'Source Han Serif SC', serif;
      --max-width: 1280px;
      --header-height: 72px;
      --header-height-mobile: 56px;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    h1, h2, h3, h4, .btn, .nav-link, .tag, .stat-number {
      font-family: var(--font-title);
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 1000;
      transition: box-shadow 0.3s ease, background 0.3s;
      border-bottom: 1px solid transparent;
    }

    #header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      background: rgba(255,255,255,0.98);
      border-bottom: 1px solid rgba(0,0,0,0.04);
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      letter-spacing: -0.3px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--accent-gold);
    }

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

    .nav-link {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-main);
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: var(--primary-deep);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all 0.3s cubic-bezier(0.25,0.8,0.25,1.2);
      cursor: pointer;
      border: none;
      font-size: 0.95rem;
    }

    .btn-primary {
      background: var(--highlight-green);
      color: var(--primary-deep);
      box-shadow: 0 2px 8px rgba(0,230,118,0.2);
    }
    .btn-primary:hover {
      background: #00ff84;
      transform: scale(1.03);
      box-shadow: 0 6px 18px rgba(0,230,118,0.3);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-deep);
      color: var(--primary-deep);
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.08);
      border-color: var(--primary-deep);
    }

    .btn-gold {
      background: var(--accent-gold);
      color: #0B2B1F;
      font-weight: 700;
    }
    .btn-gold:hover {
      background: #dbb759;
      transform: scale(1.03);
    }

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

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: #ffffff;
        flex-direction: column;
        justify-content: flex-start;
        padding: 100px 32px 40px;
        gap: 28px;
        box-shadow: -10px 0 30px rgba(0,0,0,0.08);
        transition: right 0.35s ease;
        z-index: 999;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: block;
        z-index: 1001;
      }
      .nav-menu .btn {
        width: 100%;
        margin-top: 20px;
      }
      #header {
        padding: 0 20px;
        height: var(--header-height-mobile);
      }
      .logo {
        font-size: 1.3rem;
      }
    }

    /* Hero */
    #hero {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #FAFAF8 0%, #f0f4f0 100%);
      position: relative;
      overflow: hidden;
      background-image: radial-gradient(circle at 20% 30%, rgba(200,169,81,0.05) 0%, transparent 40%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary-deep);
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-left .sub {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      position: relative;
    }
    .hero-img {
      width: 100%;
      border-radius: 20px;
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
      transform: perspective(800px) rotateY(-2deg);
      transition: transform 0.3s;
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0); }
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-left h1 {
        font-size: 2.4rem;
      }
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
    }

    /* 亮点网格 */
    #highlights {
      background: var(--bg-warm);
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }
    .highlight-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
      border-color: var(--accent-gold);
    }
    .highlight-icon {
      font-size: 2.2rem;
      color: var(--accent-gold);
      margin-bottom: 20px;
    }
    .highlight-card h3 {
      font-size: 1.25rem;
      margin-bottom: 12px;
    }
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .grid-4 {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布 */
    #showcase {
      background: #f9faf9;
    }
    .waterfall {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .showcase-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: 0.3s;
      display: flex;
      flex-direction: column;
    }
    .showcase-card:nth-child(even) {
      transform: translateY(20px);
    }
    .showcase-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }
    .showcase-img {
      height: 220px;
      object-fit: cover;
    }
    .showcase-content {
      padding: 24px;
    }
    .tag {
      background: rgba(200,169,81,0.15);
      color: #0B2B1F;
      font-weight: 600;
      font-size: 0.8rem;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }
    .stat-block {
      display: flex;
      gap: 20px;
      margin: 16px 0;
      font-weight: 700;
      color: var(--primary-deep);
    }
    @media (max-width: 768px) {
      .waterfall {
        grid-template-columns: 1fr;
      }
      .showcase-card:nth-child(even) {
        transform: translateY(0);
      }
    }

    /* 方案对比 */
    #compare {
      background: white;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .plan-card {
      background: #fafaf8;
      border-radius: var(--radius-card);
      padding: 36px 24px;
      border: 1px solid var(--border-light);
      text-align: center;
      transition: 0.3s;
    }
    .plan-card.featured {
      border: 2px solid var(--accent-gold);
      background: white;
      position: relative;
    }
    .badge-hot {
      background: var(--accent-gold);
      color: #0B2B1F;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    .plan-list {
      list-style: none;
      margin: 28px 0;
    }
    .plan-list li {
      margin: 12px 0;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px 24px;
      border: 1px solid var(--border-light);
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      margin-top: 8px;
      color: var(--text-muted);
      border-left: 3px solid var(--highlight-green);
      padding-left: 16px;
    }
    @media (max-width: 640px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA 区 */
    #cta {
      background: var(--dark-block);
      text-align: center;
      color: white;
    }
    #cta h2 {
      color: white;
      font-size: 2.5rem;
    }
    .trust-text {
      margin-top: 24px;
      opacity: 0.8;
    }

    /* 页脚 */
    #footer {
      background: #0B1A12;
      color: #ddd;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .container {
      padding: 0 24px;
    }