/* roulang page: index */
:root {
      --primary-warm-white: #FAFAF5;
      --secondary-kingfisher-green: #1A5C4A;
      --accent-feather-yellow: #F2C94C;
      --charcoal: #2D2D2D;
      --rock-gray: #6B6B6B;
      --mist-gray: #E8E5DF;
      --white: #FFFFFF;
      --border-light: rgba(0,0,0,0.05);
      --shadow-card: 0 8px 30px rgba(0,0,0,0.04);
      --shadow-elevated: 0 12px 40px rgba(0,0,0,0.06);
      --shadow-nav: 0 2px 20px rgba(0,0,0,0.04);
      --radius-card: 20px;
      --radius-button: 40px;
      --radius-small: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", sans-serif;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--primary-warm-white);
      color: var(--charcoal);
      line-height: 1.5;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      font-size: 16px;
    }

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(250, 250, 245, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, box-shadow 0.3s, border-color 0.3s;
    }

    .header.scrolled {
      background: var(--white);
      box-shadow: var(--shadow-nav);
      border-bottom: 1px solid var(--border-light);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 24px;
      letter-spacing: -0.5px;
      color: var(--charcoal);
      transition: color 0.2s;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background-color: var(--secondary-kingfisher-green);
      mask: url('data:image/svg+xml;utf8,<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M12 2L2 19h20L12 2zm0 3.5L18.5 17h-13L12 5.5z" fill="currentColor"/><circle cx="12" cy="17" r="2" fill="currentColor"/></svg>') center/contain no-repeat;
      background-color: var(--secondary-kingfisher-green);
      mask-size: contain;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M12 2L2 19h20L12 2zm0 3.5L18.5 17h-13L12 5.5z" fill="white"/><circle cx="12" cy="17" r="2" fill="white"/></svg>') center/contain no-repeat;
      background-color: var(--secondary-kingfisher-green);
    }

    .logo span {
      background: linear-gradient(to right, var(--charcoal), var(--secondary-kingfisher-green));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

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

    .nav-links a {
      font-weight: 500;
      font-size: 16px;
      color: var(--rock-gray);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--secondary-kingfisher-green);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--secondary-kingfisher-green);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background-color: var(--accent-feather-yellow);
      color: var(--charcoal);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background 0.25s, transform 0.2s, box-shadow 0.2s;
      border: none;
      cursor: pointer;
      font-size: 16px;
      letter-spacing: -0.2px;
    }

    .btn-primary:hover {
      background-color: #E5B73C;
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(242, 201, 76, 0.3);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 110;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--charcoal);
      border-radius: 4px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--white);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 105;
      backdrop-filter: blur(10px);
      background: rgba(255,255,255,0.98);
    }

    .mobile-menu a {
      font-size: 26px;
      font-weight: 600;
      color: var(--charcoal);
    }

    .mobile-menu .btn-primary {
      margin-top: 20px;
      padding: 18px 48px;
      font-size: 20px;
    }

    .close-menu {
      position: absolute;
      top: 30px;
      right: 30px;
      background: var(--accent-feather-yellow);
      border: none;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      font-size: 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 52px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -1px;
      color: var(--charcoal);
      margin-bottom: 24px;
    }

    .hero p {
      font-size: 18px;
      color: var(--rock-gray);
      margin-bottom: 36px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary-kingfisher-green);
      color: var(--secondary-kingfisher-green);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      transition: 0.25s;
    }

    .btn-outline:hover {
      background: var(--secondary-kingfisher-green);
      color: white;
    }

    .hero-image {
      flex: 1;
      position: relative;
      animation: float 4s ease-in-out infinite;
    }

    .hero-image img {
      border-radius: 40px;
      box-shadow: var(--shadow-elevated);
    }

    @keyframes float {
      0%,100% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
    }

    .watermark {
      position: absolute;
      opacity: 0.03;
      pointer-events: none;
      font-size: 180px;
      font-weight: 800;
      color: var(--secondary-kingfisher-green);
      user-select: none;
    }

    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 38px;
      font-weight: 600;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .section-sub {
      color: var(--rock-gray);
      max-width: 600px;
      margin-bottom: 60px;
      font-size: 18px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 36px 30px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border: 1px solid var(--mist-gray);
    }

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

    .card-icon {
      width: 56px;
      height: 56px;
      background: rgba(26,92,74,0.08);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--secondary-kingfisher-green);
    }

    .card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 30px;
    }

    .service-card {
      background: var(--white);
      border-radius: 24px;
      padding: 40px;
      display: flex;
      gap: 28px;
      align-items: center;
      border: 1px solid var(--mist-gray);
      transition: 0.3s;
    }

    .service-card:hover {
      border-color: var(--secondary-kingfisher-green);
    }

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

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--secondary-kingfisher-green);
    }

    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }

    .testimonial {
      background: var(--mist-gray);
      border-radius: 20px;
      padding: 28px;
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--rock-gray);
    }

    .cta-section {
      background: var(--secondary-kingfisher-green);
      color: white;
      text-align: center;
      padding: 100px 0;
      border-radius: 40px;
      margin: 80px auto;
    }

    .footer {
      background: var(--charcoal);
      color: var(--mist-gray);
      padding: 70px 0 30px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: 1fr 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .hero { flex-direction: column; text-align: center; }
    }

    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-2, .grid-3 { grid-template-columns: 1fr; }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 28px; }
      .stats-grid { grid-template-columns: 1fr; }
    }