/* roulang page: index */
:root {
      --bg-primary: #0A0E27;
      --bg-secondary: #111640;
      --bg-card: rgba(255, 255, 255, 0.05);
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8D1;
      --text-muted: #6B7294;
      --accent-red: #C8102E;
      --accent-blue: #00D4FF;
      --accent-green: #00C853;
      --accent-red-hover: #A00D24;
      --border-glass: rgba(255, 255, 255, 0.1);
      --glow-blue: rgba(0, 212, 255, 0.5);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-display: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.3s ease;
    }

    button, input {
      font-family: inherit;
      outline: none;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.4s ease, backdrop-filter 0.4s ease, box-shadow 0.4s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }

    .site-header.scrolled {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      box-shadow: 0 1px 0 rgba(0, 212, 255, 0.2);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      color: var(--accent-blue);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--accent-red);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.2rem;
    }

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

    .nav-link {
      font-weight: 500;
      font-size: 1rem;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
      transition: color 0.3s;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--accent-blue);
      transition: width 0.3s ease, left 0.3s ease;
      border-radius: 2px;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--accent-blue);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
      left: 0;
    }

    .header-actions {
      display: flex;
      gap: 12px;
      align-items: center;
    }

    .btn {
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.95rem;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-blue);
      color: var(--accent-blue);
    }

    .btn-outline:hover {
      background: rgba(0, 212, 255, 0.1);
      box-shadow: 0 0 16px rgba(0, 212, 255, 0.4);
      transform: translateY(-2px);
    }

    .btn-primary {
      background: var(--accent-red);
      color: white;
      border: 1px solid var(--accent-red);
    }

    .btn-primary:hover {
      background: var(--accent-red-hover);
      box-shadow: 0 0 20px rgba(200, 16, 46, 0.6);
      transform: translateY(-2px);
    }

    .btn-glow {
      background: var(--accent-blue);
      color: var(--bg-primary);
      font-weight: 700;
      border: none;
      box-shadow: 0 0 20px var(--glow-blue);
    }

    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(0, 212, 255, 0.8);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 18px;
      background: transparent;
      border: none;
      cursor: pointer;
      position: relative;
    }
    .hamburger span {
      width: 100%;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: all 0.3s;
    }
    .hamburger.active span:nth-child(1) {
      transform: translateY(8px) rotate(45deg);
    }
    .hamburger.active span:nth-child(2) {
      opacity: 0;
    }
    .hamburger.active span:nth-child(3) {
      transform: translateY(-8px) rotate(-45deg);
    }

    /* Hero */
    .hero {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      min-height: 100vh;
      background: radial-gradient(circle at 20% 30%, #1a1f4b 0%, #0A0E27 70%);
      position: relative;
      overflow: hidden;
    }

    .hero-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    .particle {
      position: absolute;
      background: var(--accent-blue);
      border-radius: 50%;
      opacity: 0.2;
      animation: float 20s infinite;
    }
    @keyframes float {
      0% { transform: translateY(0) scale(1); }
      50% { transform: translateY(-30px) scale(1.3); }
      100% { transform: translateY(0) scale(1); }
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-content h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      background: linear-gradient(to right, #fff, #b0c4ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .trust-badge {
      display: flex;
      gap: 24px;
      margin-top: 2rem;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .trust-badge i {
      color: var(--accent-green);
      margin-right: 6px;
    }
    .login-card {
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      animation: floatCard 6s infinite alternate;
    }
    @keyframes floatCard {
      0% { transform: translateY(0); }
      100% { transform: translateY(-10px); }
    }
    .login-card h3 {
      margin-bottom: 24px;
      font-weight: 600;
    }
    .input-group {
      margin-bottom: 20px;
    }
    .input-group input {
      width: 100%;
      padding: 14px 16px;
      background: rgba(255,255,255,0.08);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-sm);
      color: white;
      font-size: 1rem;
      transition: 0.2s;
    }
    .input-group input:focus {
      border-color: var(--accent-blue);
      box-shadow: 0 0 12px rgba(0,212,255,0.4);
    }
    .login-btn {
      width: 100%;
      padding: 14px;
      font-weight: 700;
      margin: 8px 0 16px;
    }
    .forgot {
      text-align: right;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
    }
    .pain-main {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,82,82,0.2);
      border-radius: var(--radius-lg);
      padding: 40px;
    }
    .pain-side {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .pain-small {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-md);
      padding: 24px;
    }
    .accent-red-text {
      color: #FF5252;
    }

    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1;
      background: rgba(0,212,255,0.1);
      border-radius: var(--radius-lg);
      overflow: hidden;
      backdrop-filter: blur(8px);
    }
    .solution-img img {
      width: 100%;
      height: auto;
      mix-blend-mode: lighten;
      opacity: 0.9;
    }
    .solution-text {
      flex: 1;
    }

    /* 数据统计 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
      text-align: center;
      background: var(--bg-secondary);
      border-radius: var(--radius-lg);
      padding: 48px 32px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent-blue);
    }

    /* 证言滚动 */
    .testimonials-track {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 12px 0 24px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 320px;
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      padding: 28px;
      scroll-snap-align: start;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-md);
      padding: 20px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-item.active {
      border-color: var(--accent-blue);
      box-shadow: 0 0 16px rgba(0,212,255,0.3);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #0f1235, #0A0E27);
      text-align: center;
      border-top: 1px solid rgba(0,212,255,0.3);
      border-bottom: 1px solid rgba(0,212,255,0.3);
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      padding: 60px 0;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-glass);
      padding: 24px 0;
      text-align: center;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.95);
        backdrop-filter: blur(24px);
        flex-direction: column;
        padding: 40px;
        gap: 24px;
        transform: translateY(-150%);
        transition: 0.3s;
      }
      .nav-menu.open { transform: translateY(0); }
      .pain-grid, .solution-row, .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }