/* roulang page: index */
:root {
      --primary-red: #E6392D;
      --primary-red-hover: #C62828;
      --dark-bg: #1A1A1A;
      --body-bg: #F5F4F0;
      --surface: #FFFFFF;
      --text-primary: #1A1A1A;
      --text-secondary: #5C5C5C;
      --accent-green: #0F9B5E;
      --border-color: #E0DCD5;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "SF Pro Text", system-ui, sans-serif;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 20px 30px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-button: 8px;
      --spacing-section: 80px;
      --transition-default: 0.25s ease;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--body-bg);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-default);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 26, 26, 0.88);
      backdrop-filter: blur(8px);
      border-bottom: 2px solid transparent;
      background-image: linear-gradient(to right, var(--primary-red), var(--primary-red));
      background-size: 100% 2px;
      background-repeat: no-repeat;
      background-position: bottom;
      transition: background var(--transition-default);
    }

    .navbar.scrolled {
      background: #1A1A1A;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      flex-direction: column;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: -0.3px;
    }

    .logo-main {
      font-size: 22px;
      line-height: 1.2;
    }

    .logo-sub {
      font-size: 11px;
      color: rgba(255,255,255,0.65);
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 15px;
      position: relative;
    }

    .nav-links a:hover {
      color: #FFFFFF;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-red);
      transition: width 0.2s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--primary-red);
      color: #FFFFFF !important;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
    }

    .btn-nav:hover {
      background: var(--primary-red-hover);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: #fff;
      border-radius: 2px;
      transition: var(--transition-default);
    }

    .mobile-menu {
      display: none;
    }

    /* 首屏 */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1A1A1A 0%, #2A2A2A 100%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }

    .hero-bg-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.18;
      filter: blur(2px);
    }

    .speed-lines {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: repeating-linear-gradient(45deg, transparent, transparent 3px, rgba(230,57,45,0.12) 5px, transparent 8px);
      animation: moveLines 20s linear infinite;
      pointer-events: none;
    }

    @keyframes moveLines {
      0% { transform: translateX(-50px); }
      100% { transform: translateX(0px); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 60px;
      align-items: center;
    }

    .hero-text h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      color: #FFFFFF;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-text .highlight {
      color: var(--primary-red);
    }

    .hero-subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.75);
      margin-bottom: 32px;
      max-width: 560px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-red);
      color: #fff;
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition-default);
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--primary-red-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(230,57,45,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid #FFFFFF;
      color: #FFFFFF;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition-default);
    }

    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
      transform: translateY(-2px);
    }

    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .speed-ring {
      width: 280px;
      height: 280px;
      border-radius: 50%;
      border: 6px solid rgba(230,57,45,0.8);
      display: flex;
      align-items: center;
      justify-content: center;
      animation: pulseRing 3s infinite;
      box-shadow: 0 0 40px rgba(230,57,45,0.25);
    }

    .inner-glow {
      width: 180px;
      height: 180px;
      background: rgba(230,57,45,0.2);
      border-radius: 50%;
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 36px;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    @keyframes pulseRing {
      0% { transform: scale(0.95); }
      50% { transform: scale(1.02); }
      100% { transform: scale(0.95); }
    }

    /* 板块通用 */
    section {
      padding: var(--spacing-section) 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-primary);
    }

    .section-subtitle {
      color: var(--text-secondary);
      font-size: 17px;
      margin-bottom: 48px;
    }

    /* 优势卡片不对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    .adv-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 36px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-default);
    }

    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .adv-card .icon {
      font-size: 36px;
      margin-bottom: 20px;
    }

    .adv-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 功能左右交替 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 64px;
    }

    .feature-row.reverse {
      flex-direction: row-reverse;
    }

    .feature-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
    }

    .feature-text {
      flex: 1;
    }

    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scenario-card {
      background: var(--surface);
      border-radius: 32px;
      padding: 28px;
      text-align: center;
      transition: var(--transition-default);
    }

    /* 案例深色区 */
    .dark-section {
      background: var(--dark-bg);
      color: #FFFFFF;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 40px;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-green);
    }

    /* 套餐 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .plan-card {
      background: var(--surface);
      padding: 40px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-color);
    }

    .plan-card.featured {
      border: 2px solid var(--primary-red);
      transform: scale(1.02);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-color);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-full {
      background: var(--dark-bg);
      text-align: center;
      padding: 80px 20px;
    }

    /* Footer */
    .footer {
      background: #0F0F0F;
      color: #AAA;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .hero-content {
        grid-template-columns: 1fr;
      }
      .pricing-grid, .scenarios-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
      .hero-text h1 { font-size: 36px; }
      .advantages-grid { grid-template-columns: 1fr; }
    }