/* roulang page: index */
:root {
      --primary-deep: #1A5C4A;
      --primary-soft: #2D8B6E;
      --accent-orange: #F05A28;
      --accent-light: #FF7A45;
      --bg-paper: #F7F5F2;
      --bg-white: #FFFFFF;
      --bg-dark: #0E2D24;
      --text-primary: #1E2D2B;
      --text-secondary: #4A5C58;
      --text-muted: #7A8A86;
      --border-light: #D1D5DB;
      --border-focus: #1A5C4A;
      --shadow-card: 0 12px 28px rgba(26,92,74,0.06);
      --shadow-hover: 0 18px 35px rgba(26,92,74,0.12);
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-pill: 30px;
      --radius-circle: 50%;
      --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --transition-base: 0.25s cubic-bezier(0.2, 0.0, 0, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-serif);
      background-color: var(--bg-paper);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    h1, h2, h3, .sans {
      font-family: var(--font-sans);
      font-weight: 700;
      letter-spacing: -0.01em;
    }
    h2 {
      font-size: 2.25rem;
      margin-bottom: 0.5rem;
      color: #1E2D2B;
    }
    h3 {
      font-size: 1.5rem;
      color: #1A2D2A;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }
    img {
      max-width: 100%;
      display: block;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      z-index: 50;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(26,92,74,0.08);
      transition: background var(--transition-base), box-shadow var(--transition-base);
    }
    .site-header.scrolled {
      background: rgba(247,245,242,0.95);
      box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-sans);
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      display: flex;
      align-items: baseline;
      color: var(--primary-deep);
    }
    .logo .accent {
      color: var(--accent-orange);
      margin-left: 2px;
    }
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .nav-links a {
      font-family: var(--font-sans);
      font-weight: 500;
      font-size: 0.95rem;
      color: #2E3D38;
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-links a:hover {
      color: var(--accent-orange);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--accent-orange);
      border-radius: 2px;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: var(--primary-deep);
      border-radius: 4px;
      transition: var(--transition-base);
    }
    /* 移动端导航面板 */
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .nav-mobile {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: #F7F5F2;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2.5rem;
        font-size: 2rem;
        transform: translateY(-100%);
        transition: transform 0.35s ease;
        z-index: 40;
      }
      .nav-mobile.open {
        transform: translateY(0);
      }
      .nav-mobile a {
        font-family: var(--font-sans);
        font-weight: 600;
        color: var(--primary-deep);
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 5rem;
      background: linear-gradient(135deg, #1A5C4A 0%, #2D8B6E 70%, #F05A28 150%);
      position: relative;
      color: white;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="0.8" numOctaves="1" stitchTiles="stitch"/></filter><rect width="100" height="100" filter="url(/%23noise)" opacity="0.08"/></svg>');
      pointer-events: none;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      position: relative;
    }
    .hero-text {
      flex: 0 0 52%;
    }
    .hero-text h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      text-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }
    .hero-sub {
      font-size: 1.15rem;
      opacity: 0.93;
      margin-bottom: 2.2rem;
      max-width: 85%;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(90deg, #F05A28 0%, #FF7A45 100%);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.85rem 2.2rem;
      border-radius: 30px;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      box-shadow: 0 0 18px rgba(240,90,40,0.5);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 0.8rem 2rem;
      border-radius: 30px;
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary-deep);
    }
    .hero-image {
      flex: 1;
      background: rgba(255,255,255,0.1);
      border-radius: 24px;
      overflow: hidden;
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-text h1 {
        font-size: 2.4rem;
      }
      .btn-group {
        justify-content: center;
      }
    }
    /* 通用区块 */
    section {
      padding: 5rem 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    .pain-grid, .feature-grid, .service-grid {
      display: grid;
      gap: 2rem;
    }
    .pain-grid { grid-template-columns: repeat(3, 1fr); }
    .pain-card {
      background: white;
      padding: 2rem;
      border-radius: 20px;
      border-left: 5px solid var(--primary-deep);
      transition: 0.2s;
    }
    .pain-card:hover { border-left-color: var(--accent-orange); }
    .feature-grid { grid-template-columns: repeat(3, 1fr); }
    .feature-card {
      background: white;
      border-radius: 20px;
      padding: 2rem 1.5rem;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .badge-circle {
      width: 80px;
      height: 80px;
      background: var(--accent-orange);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.5rem;
      color: white;
      font-weight: 800;
      font-size: 1.4rem;
    }
    .service-grid { grid-template-columns: repeat(3, 1fr); }
    .service-card {
      background: white;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .service-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .service-content { padding: 1.5rem; }
    .cases-bg {
      background: #0E2D24;
      color: white;
      border-radius: 28px;
      padding: 3rem 1.5rem;
    }
    .case-scroll {
      display: flex;
      gap: 1.5rem;
      overflow-x: auto;
      padding-bottom: 1rem;
    }
    .case-card {
      min-width: 280px;
      background: rgba(255,255,255,0.08);
      border-radius: 20px;
      padding: 1.5rem;
    }
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 1rem;
      padding: 1.2rem;
      border: 1px solid #e2e8e4;
      cursor: pointer;
    }
    .faq-q { display: flex; align-items: center; gap: 0.8rem; }
    .contact-cta {
      background: linear-gradient(135deg, #1A5C4A, #2D8B6E);
      border-radius: 30px;
      padding: 3.5rem;
      color: white;
    }
    .footer {
      background: #0E2D24;
      color: #cbd5d1;
      padding: 3rem 0 2rem;
    }
    @media (max-width: 768px) {
      .pain-grid, .feature-grid, .service-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .container { padding: 0 1.5rem; }
      h2 { font-size: 1.8rem; }
    }
    input, textarea {
      width: 100%;
      padding: 0.9rem;
      border-radius: 10px;
      border: 1px solid #D1D5DB;
      margin-bottom: 1rem;
      font-family: inherit;
    }
    input:focus { border-color: var(--primary-deep); outline: none; }