/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-dark: #E0391A;
      --secondary: #1B1B1B;
      --accent: #7C3AED;
      --bg-warm: #F9F7F4;
      --card-bg: #FFFFFF;
      --text-primary: #1B1B1B;
      --text-secondary: #5C5C5C;
      --text-on-dark: #FFFFFF;
      --border-light: #E8E3DC;
      --shadow-card: 0 4px 20px rgba(240,78,35,0.08);
      --shadow-hover: 0 12px 32px rgba(240,78,35,0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 640px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .navbar.scrolled {
      background: #FFFFFF;
      box-shadow: 0 2px 16px rgba(0,0,0,0.06);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-primary);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-primary {
      background: linear-gradient(135deg, #F04E23 0%, #E0391A 100%);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: all 0.25s ease;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 4px 12px rgba(240,78,35,0.3);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(240,78,35,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s ease;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background: #FFF0EB;
      transform: scale(1.03);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-ghost:hover {
      background: white;
      color: var(--primary);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--text-primary);
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 12px 24px rgba(0,0,0,0.08);
        border-top: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }
    /* hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 90% 20%, rgba(240,78,35,0.12) 0%, rgba(249,247,244,1) 70%);
      padding-top: 80px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero h1 {
      font-size: 42px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--secondary);
      margin-bottom: 1.2rem;
    }
    .hero .sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .hero-image {
      width: 100%;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(240,78,35,0.2);
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero h1 {
        font-size: 32px;
      }
      .hero-image {
        order: -1;
        max-height: 280px;
      }
    }
    section {
      padding: 100px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
    }
    h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 1rem;
      letter-spacing: -0.3px;
    }
    .card-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 2.5rem;
    }
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      text-align: center;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(240,78,35,0.3);
    }
    .feature-card i {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1rem;
    }
    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }
    @media (max-width: 1024px) {
      .card-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .card-grid {
        grid-template-columns: 1fr;
      }
    }
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-text {
      flex: 1;
    }
    .service-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 12px 28px rgba(0,0,0,0.08);
    }
    .service-img img {
      width: 100%;
      height: auto;
      display: block;
    }
    @media (max-width: 768px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
      }
    }
    .scene-band {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      padding: 100px 0;
    }
    .scene-overlay {
      background: rgba(27,27,27,0.75);
      backdrop-filter: blur(6px);
      padding: 60px 24px;
      border-radius: 24px;
    }
    .glass-card {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      border-radius: 16px;
      padding: 24px;
      color: white;
      border: 1px solid rgba(255,255,255,0.2);
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 2rem;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      border: 1px solid var(--border-light);
      padding: 16px 20px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-item.active {
      border-color: rgba(240,78,35,0.5);
    }
    .faq-q {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-a {
      margin-top: 12px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-a {
      display: block;
    }
    @media (max-width: 640px) {
      .faq-grid { grid-template-columns: 1fr; }
    }
    .cta-band {
      background: #1B1B1B;
      background-image: radial-gradient(circle at 30% 50%, rgba(124,58,237,0.25), transparent 70%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    footer {
      background: #151515;
      color: #999;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 480px) {
      .footer-grid { grid-template-columns: 1fr; }
    }