/* roulang page: index */
:root {
      --primary: #F04E30;
      --primary-dark: #c43c25;
      --deep-blue: #1A1D2E;
      --bg-warm: #F7F5F2;
      --accent: #00C2BA;
      --text-main: #3A3D4A;
      --text-title: #1A1D2E;
      --text-muted: #6B6E7A;
      --white: #FFFFFF;
      --glass-bg: rgba(255,255,255,0.75);
      --glass-border: rgba(255,255,255,0.4);
      --card-shadow: 0 10px 25px -8px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.02);
      --card-shadow-hover: 0 20px 35px -12px rgba(0,0,0,0.12), 0 8px 18px rgba(0,0,0,0.04);
      --radius-lg: 28px;
      --radius-md: 18px;
      --radius-pill: 50px;
      --radius-sm: 14px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      background: var(--bg-warm);
      font-family: var(--font-sans);
      color: var(--text-main);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    a, button {
      text-decoration: none;
      transition: all 0.28s ease;
      cursor: pointer;
    }
    h1, h2, h3 {
      color: var(--text-title);
      font-weight: 650;
      line-height: 1.3;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(26, 29, 46, 0.82);
      backdrop-filter: blur(22px);
      -webkit-backdrop-filter: blur(22px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.25s;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .nav-bar.scrolled {
      background: rgba(26, 29, 46, 0.96);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 0 28px;
      max-width: 1250px;
      margin: 0 auto;
    }
    .logo {
      font-size: 1.9rem;
      font-weight: 720;
      letter-spacing: 1px;
      color: white;
      display: flex;
      align-items: center;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-list {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-list a {
      color: rgba(255,255,255,0.9);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 2px;
    }
    .nav-list a:hover {
      color: var(--primary);
    }
    .nav-list a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background: var(--primary);
      transition: transform 0.22s;
      transform-origin: center;
    }
    .nav-list a:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-pill);
      font-weight: 600;
      border: none;
      font-size: 0.95rem;
      margin-left: 0.8rem;
      box-shadow: 0 4px 10px rgba(240,78,48,0.28);
    }
    .btn-nav:hover {
      background: var(--deep-blue);
      box-shadow: 0 0 18px rgba(240,78,48,0.45);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 7px;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: white;
      border-radius: 6px;
      transition: 0.25s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      inset: 0;
      background: var(--deep-blue);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 200;
      gap: 2.5rem;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.5rem;
      font-weight: 500;
    }
    .mobile-menu .btn-nav {
      margin: 0;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1A1D2E 0%, #111422 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-img {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.33;
      filter: brightness(0.7);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 3rem;
    }
    .hero-left {
      flex: 1 1 45%;
    }
    .hero-right {
      flex: 1 1 40%;
      display: flex;
      justify-content: center;
      backdrop-filter: blur(15px);
      background: rgba(255,255,255,0.12);
      border-radius: var(--radius-lg);
      padding: 18px;
    }
    .hero-right img {
      border-radius: 16px;
    }
    .hero h1 {
      font-size: clamp(2.6rem, 5.8vw, 3.6rem);
      font-weight: 720;
      color: white;
      margin-bottom: 1.6rem;
      letter-spacing: -0.3px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.75);
      margin-bottom: 2.4rem;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 15px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 1rem;
      border: none;
    }
    .btn-primary:hover {
      background: var(--deep-blue);
      box-shadow: 0 0 24px rgba(240,78,48,0.5);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.7);
      color: white;
      padding: 14px 34px;
      border-radius: var(--radius-pill);
    }
    .btn-outline:hover {
      background: white;
      color: var(--dark);
      border-color: white;
    }
    /* sections */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 670;
      margin-bottom: 18px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 630px;
      margin: 0 auto 50px;
    }
    /* 服务 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
      gap: 30px;
    }
    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border: 1px solid rgba(255,255,255,0.45);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      transition: all 0.3s;
      box-shadow: var(--card-shadow);
    }
    .service-card:hover {
      transform: translateY(-7px);
      box-shadow: var(--card-shadow-hover);
    }
    .service-icon {
      font-size: 2.4rem;
      color: var(--accent);
      margin-bottom: 18px;
    }
    .card-link {
      margin-top: 14px;
      display: inline-block;
      color: var(--primary);
      font-weight: 600;
    }
    .advantages {
      background: #EDEBE6;
      border-radius: var(--radius-lg);
      padding: 60px 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      text-align: center;
    }
    .adv-item h3 {
      font-size: 2.7rem;
      color: var(--primary);
      font-weight: 700;
    }
    .process-steps {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .step {
      flex: 1;
      text-align: center;
      padding: 18px;
    }
    .step-num {
      background: var(--primary);
      color: white;
      width: 50px;
      height: 50px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }
    .faq-list {
      max-width: 780px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      margin-bottom: 14px;
      border-radius: var(--radius-sm);
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 18px;
      display: none;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer { display: block; }
    .cta-block {
      background: linear-gradient(135deg, #F04E30 0%, #1A1D2E 100%);
      color: white;
      text-align: center;
      padding: 7rem 20px;
    }
    footer {
      background: #1A1D2E;
      color: #bbb;
      padding: 60px 20px 28px;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      justify-content: space-between;
    }
    @media (max-width: 768px) {
      .nav-list { display: none; }
      .hamburger { display: flex; }
      .hero .container { flex-direction: column; }
      .process-steps { flex-direction: column; }
    }