/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-dark: #D43E1A;
      --secondary: #1A1D2E;
      --accent: #00C9A7;
      --bg-light: #F9F7F5;
      --bg-gray: #F4F5F7;
      --text-main: #1A1D2E;
      --text-secondary: #5A5D6E;
      --border-light: #E0E2E8;
      --white: #FFFFFF;
      --white-70: rgba(255,255,255,0.7);
      --white-90: rgba(255,255,255,0.9);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.12);
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: rgba(26, 29, 46, 0.7);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .header.scrolled {
      background: rgba(26, 29, 46, 0.95);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--white);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.2rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      color: var(--white-90);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color var(--transition);
      position: relative;
      padding: 4px 0;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: background var(--transition), transform var(--transition);
      box-shadow: 0 4px 10px rgba(240,78,35,0.3);
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: white;
      border-radius: 2px;
      transition: var(--transition);
    }
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--secondary);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 999;
      list-style: none;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 1.8rem;
      color: white;
      font-weight: 600;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      background: transparent;
      border: none;
      color: white;
      font-size: 2rem;
      cursor: pointer;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1A1D2E 0%, #141722 100%);
      position: relative;
      overflow: hidden;
      padding: 100px 0 80px;
    }
    .hero-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.15;
      z-index: 0;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1;
      color: white;
    }
    .hero h1 {
      font-size: clamp(2.4rem, 6vw, 3.6rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--white-70);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 1rem;
      transition: background var(--transition), transform var(--transition);
      box-shadow: 0 6px 20px rgba(240,78,35,0.4);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 1rem;
      transition: background var(--transition);
    }
    .btn-ghost:hover {
      background: rgba(255,255,255,0.1);
    }
    .hero-visual {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 380px;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.5));
      animation: float 5s ease-in-out infinite;
    }
    @keyframes float {
      0%,100%{ transform: translateY(0); }
      50%{ transform: translateY(-12px); }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--secondary);
      text-align: center;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 50px;
    }
    /* 数据看板 */
    .stats {
      background: var(--bg-light);
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      text-align: center;
    }
    .stat-item {
      flex: 1;
      min-width: 180px;
      background: white;
      padding: 32px 16px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
    }
    /* 服务卡片 */
    .features {
      background: white;
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 30px;
    }
    .feature-card {
      background: var(--white);
      padding: 36px 28px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      border: 1px solid transparent;
    }
    .feature-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      background: rgba(240,78,35,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      font-size: 1.8rem;
      color: var(--primary);
      transition: var(--transition);
    }
    .feature-card:hover .feature-icon {
      background: var(--primary);
      color: white;
    }
    .feature-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    /* 对比组件 */
    .compare {
      background: var(--bg-gray);
    }
    .compare-wrapper {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .compare-col.bad {
      background: #f2f2f5;
      color: #6b6b7a;
    }
    .compare-col.good {
      background: white;
      border: 1px solid var(--primary);
    }
    .compare-row {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 18px 0;
      font-size: 1.05rem;
    }
    /* 步骤 */
    .steps {
      background: white;
    }
    .steps-flex {
      display: flex;
      justify-content: space-between;
      gap: 30px;
      flex-wrap: wrap;
    }
    .step {
      flex: 1;
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 56px;
      height: 56px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      font-weight: 700;
      margin: 0 auto 20px;
    }
    /* FAQ */
    .faq {
      background: var(--bg-light);
    }
    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .accordion-question {
      font-weight: 700;
      font-size: 1.2rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .accordion-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .accordion-item.active .accordion-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #1A1D2E, #F04E23);
      color: white;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      max-width: 500px;
      margin: 32px auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }
    .cta-form input {
      flex: 1;
      padding: 16px;
      border-radius: 30px;
      border: none;
      font-size: 1rem;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border: none;
      padding: 16px 32px;
      border-radius: 30px;
      font-weight: 700;
      cursor: pointer;
    }
    /* Footer */
    .footer {
      background: #141722;
      color: var(--white-70);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px,1fr));
      gap: 40px;
    }
    .footer a {
      color: var(--white-70);
    }
    .footer a:hover {
      color: var(--primary);
    }
    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .compare-wrapper { flex-direction: column; }
      .steps-flex { flex-direction: column; }
    }