/* roulang page: index */
:root {
      --primary: #E6390C;
      --primary-dark: #C62E0A;
      --secondary-light: #F4A261;
      --deep-blue: #1A1A2E;
      --bg-warm: #FDFCF8;
      --text-main: #1E1E1E;
      --text-muted: #5A5A5A;
      --border-warm: #EADBC8;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(26, 26, 46, 0.06);
      --shadow-hover: 0 12px 32px rgba(230, 57, 12, 0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-title: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", sans-serif;
      --font-number: "DIN Alternate", "Bebas Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }
    body {
      font-family: var(--font-title);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 1000;
      transition: background var(--transition), box-shadow var(--transition);
      background: transparent;
    }
    .navbar.scrolled {
      background: rgba(26, 26, 46, 0.94);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      color: white;
      transition: color var(--transition);
    }
    .navbar.scrolled .logo span {
      color: white;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: background var(--transition), transform var(--transition);
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      z-index: 1001;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: white;
      border-radius: 4px;
      transition: var(--transition);
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 320px;
      height: 100vh;
      background: var(--deep-blue);
      padding: 100px 32px 40px;
      display: flex;
      flex-direction: column;
      gap: 28px;
      transition: right 0.35s ease;
      z-index: 999;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 500;
    }
    .mobile-menu .nav-cta {
      display: inline-block;
      text-align: center;
      margin-top: 24px;
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }
    #heroCanvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 800px;
      padding: 0 24px;
    }
    .hero h1 {
      font-size: clamp(2.4rem, 5vw, 3.6rem);
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.75);
      max-width: 600px;
      margin: 0 auto 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
    }
    .btn-outline:hover {
      background: white;
      color: var(--deep-blue);
    }
    .btn-large {
      background: var(--secondary-light);
      color: #1E1E1E;
      padding: 18px 48px;
      border-radius: 10px;
      font-weight: 700;
    }
    .btn-large:hover {
      background: #e8912a;
      transform: translateY(-3px);
    }
    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-dark {
      background: var(--deep-blue);
      color: white;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 600;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 60px;
    }
    /* 优势错位 */
    .advantage-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .advantage-row.reverse {
      flex-direction: row-reverse;
    }
    .adv-text {
      flex: 1;
    }
    .adv-text h3 {
      font-size: 1.8rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--primary);
    }
    .adv-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    /* 服务卡片 */
    .service-main {
      display: flex;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 40px;
      transition: var(--transition);
    }
    .service-main:hover {
      box-shadow: var(--shadow-hover);
    }
    .service-main img {
      width: 45%;
      object-fit: cover;
    }
    .service-main-text {
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-left: 4px solid var(--primary);
    }
    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--secondary-light));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .progress-bar {
      height: 6px;
      background: rgba(255,255,255,0.2);
      border-radius: 4px;
      margin-top: 12px;
      overflow: hidden;
    }
    .progress-fill {
      height: 100%;
      background: var(--primary);
      width: 0%;
      transition: width 1.5s ease;
    }
    /* 案例网格 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    .case-card img {
      transition: transform 0.4s ease;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-muted);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      margin-top: 12px;
    }
    /* CTA */
    .cta-banner {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 40px;
      margin-top: 24px;
      color: rgba(255,255,255,0.8);
    }
    /* footer */
    .footer {
      background: var(--deep-blue);
      color: #ccc;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .container { padding: 0 20px; }
      .advantage-row { flex-direction: column; gap: 30px; }
      .service-main { flex-direction: column; }
      .service-main img { width: 100%; height: 240px; }
      .case-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .section { padding: 70px 0; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero h1 { font-size: 2.2rem; }
      .service-grid { grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 520px) {
      .hero-buttons { flex-direction: column; align-items: center; }
    }