/* roulang page: index */
:root {
      --primary: #0A7E3D;
      --primary-dark: #065f2e;
      --secondary: #1A1A2E;
      --accent: #FF6B35;
      --accent-hover: #E55A2B;
      --bg-light: #F5F7FA;
      --white: #FFFFFF;
      --text-dark: #1E293B;
      --text-gray: #64748B;
      --text-light: #94A3B8;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.1);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --font-title: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", "DIN Alternate", "Bebas Neue", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-title);
      font-weight: 700;
      line-height: 1.3;
    }
    h1 {
      font-size: clamp(2.5rem, 5vw, 3.25rem);
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--white);
    }
    h2 {
      font-size: clamp(2rem, 4vw, 2.5rem);
      color: var(--secondary);
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.375rem;
      font-weight: 600;
    }
    p {
      color: var(--text-gray);
      font-size: 1rem;
      line-height: 1.75;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      padding: 12px 28px;
      font-size: 1rem;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--white);
      box-shadow: 0 4px 12px rgba(255,107,53,0.3);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255,107,53,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: var(--white);
    }
    .btn-light {
      background: var(--white);
      color: var(--accent);
      box-shadow: var(--shadow-sm);
    }
    .btn-light:hover {
      background: #f8fafc;
      transform: scale(1.03);
      box-shadow: var(--shadow-md);
    }
    /* 导航 */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: box-shadow 0.3s, border-color 0.3s;
    }
    header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 1.6rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.3px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: var(--text-dark);
    }
    .nav-links a {
      position: relative;
      padding: 8px 0;
      font-size: 0.95rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 16px;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      z-index: 1100;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 4px;
      transition: 0.3s;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: var(--secondary);
      z-index: 1050;
      display: flex;
      flex-direction: column;
      padding: 100px 32px 40px;
      transition: right 0.35s ease;
      gap: 28px;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding-bottom: 12px;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1A1A2E 0%, #0A2E1A 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding: 100px 0 60px;
      margin-top: 0;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-text {
      color: white;
    }
    .hero-text .subtitle {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin: 20px 0 32px;
      max-width: 450px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      max-width: 100%;
      height: auto;
      border: 1px solid rgba(255,255,255,0.1);
    }
    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-header p {
      max-width: 600px;
      margin: 12px auto 0;
      font-size: 1.1rem;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-bottom: 3px solid var(--accent);
    }
    .icon-box {
      width: 56px;
      height: 56px;
      background: rgba(10,126,61,0.08);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 28px;
    }
    /* 数据深色区 */
    .dark-bg {
      background: var(--secondary);
      color: white;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .badge {
      background: var(--accent);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      position: absolute;
      top: 12px;
      left: 12px;
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      padding: 20px 24px;
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    .faq-item.active {
      border-left-color: var(--accent);
      background: #f9fafb;
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-gray);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-band {
      background: var(--primary);
      text-align: center;
      padding: 80px 0;
      color: white;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    footer {
      background: var(--secondary);
      color: #cbd5e1;
      padding: 60px 0 20px;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .grid-4 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-cta { display: none; }
      .hamburger { display: flex; }
      .hero .container { grid-template-columns: 1fr; text-align: center; }
      .hero-text .subtitle { margin: 16px auto 28px; }
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero { min-height: auto; padding: 120px 0 70px; }
    }