/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #00FFAA;
      --primary-glow: rgba(0, 255, 170, 0.6);
      --secondary: #00B4D8;
      --danger: #FF3366;
      --bg-deep: #0A0E17;
      --bg-card: #1A1F2B;
      --bg-footer: #05080F;
      --text-light: #E0E5EB;
      --text-muted: #8A94A6;
      --border-dim: rgba(0, 255, 170, 0.1);
      --border-hover: #00FFAA;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 30px rgba(0,255,170,0.15);
      --container-max: 1280px;
      --section-gap: 100px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-muted);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 排版 */
    h1, h2, h3, h4 {
      color: var(--text-light);
      font-weight: 700;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      text-shadow: 0 0 20px rgba(0,255,170,0.3);
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
      font-weight: 600;
    }
    a {
      color: var(--secondary);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--primary);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: var(--bg-deep);
      font-weight: 600;
      padding: 14px 28px;
      border-radius: var(--radius-md);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all 0.25s ease;
      box-shadow: 0 4px 14px rgba(0,255,170,0.4);
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 25px var(--primary-glow);
      filter: brightness(1.1);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--secondary);
      color: var(--secondary);
      font-weight: 600;
      padding: 14px 28px;
      border-radius: var(--radius-md);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.25s ease;
    }
    .btn-secondary:hover {
      background: var(--secondary);
      color: var(--bg-deep);
      border-color: var(--secondary);
      box-shadow: 0 0 18px rgba(0,180,216,0.5);
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 23, 0.75);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      transition: background 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      text-shadow: 0 0 12px var(--primary-glow);
      letter-spacing: -0.5px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-muted);
      font-weight: 500;
      position: relative;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      margin-left: 16px;
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: #fff;
    }
    /* 区块间距 */
    section {
      padding: var(--section-gap) 0;
    }
    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 80px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 70% 30%, rgba(0,255,170,0.08) 0%, var(--bg-deep) 90%);
    }
    .hero .container {
      position: relative;
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      margin-bottom: 24px;
    }
    .hero-left .sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .data-panel {
      background: rgba(26,31,43,0.8);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-lg);
      padding: 24px;
      width: 100%;
      max-width: 380px;
      box-shadow: var(--shadow-card);
    }
    .live-badge {
      color: var(--primary);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 16px;
    }
    .score-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: #fff;
      font-weight: 700;
      font-size: 1.5rem;
      margin: 12px 0;
      font-family: 'JetBrains Mono', monospace;
    }
    .data-flow {
      margin-top: 20px;
      display: flex;
      gap: 4px;
    }
    .data-dot {
      width: 6px;
      height: 6px;
      background: var(--primary);
      border-radius: 50%;
      animation: pulse 1.4s infinite;
    }
    @keyframes pulse {
      0%{opacity:0.4; transform:scale(1);}
      50%{opacity:1; transform:scale(1.6);}
      100%{opacity:0.4;}
    }
    /* 痛点 */
    .problem-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .problem-card {
      background: var(--bg-card);
      border-left: 4px solid var(--danger);
      padding: 28px;
      border-radius: var(--radius-lg);
      transition: all 0.25s;
    }
    .problem-card i {
      color: var(--danger);
      font-size: 2rem;
      margin-bottom: 16px;
    }
    /* 解决方案不对称布局 */
    .solution-row {
      display: flex;
      gap: 60px;
      align-items: center;
    }
    .solution-img {
      flex: 1.2;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .solution-text {
      flex: 1;
    }
    .advantage-item {
      display: flex;
      gap: 20px;
      margin-bottom: 28px;
    }
    .advantage-item i {
      color: var(--primary);
      font-size: 2rem;
      width: 40px;
    }
    /* 数据看板 */
    .dashboard {
      background: #0B1019;
      border-radius: var(--radius-lg);
      padding: 48px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      text-align: center;
    }
    .stat .number {
      font-family: 'JetBrains Mono', monospace;
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
      text-shadow: 0 0 12px var(--primary-glow);
    }
    /* 证言卡片 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: var(--bg-card);
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-dim);
      transition: all 0.25s;
    }
    .testimonial-card:hover {
      border-color: var(--border-hover);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .user-info {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-top: 20px;
    }
    .avatar {
      width: 48px;
      height: 48px;
      background: var(--secondary);
      border-radius: 50%;
    }
    /* FAQ 手风琴 */
    .faq-grid {
      display: flex;
      gap: 40px;
      align-items: flex-start;
    }
    .faq-left {
      flex: 1;
    }
    .faq-right {
      flex: 2;
    }
    .accordion-item {
      background: var(--bg-card);
      margin-bottom: 16px;
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .accordion-header {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: #fff;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .accordion-header.active {
      border-left-color: var(--primary);
      background: #202634;
    }
    .accordion-body {
      padding: 0 24px 18px;
      display: none;
      color: var(--text-muted);
    }
    .accordion-body.open {
      display: block;
    }
    /* CTA */
    .final-cta {
      background: #0A0E17;
    }
    .cta-content {
      text-align: center;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .footer-col h4 {
      margin-bottom: 20px;
      color: #fff;
    }
    .footer-col a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 12px;
    }
    .subscribe-input {
      display: flex;
      margin-top: 16px;
    }
    .subscribe-input input {
      flex: 1;
      background: #1A1F2B;
      border: 1px solid var(--border-dim);
      padding: 12px;
      color: #fff;
      border-radius: var(--radius-md) 0 0 var(--radius-md);
    }
    .subscribe-input button {
      background: var(--primary);
      color: #000;
      border-radius: 0 var(--radius-md) var(--radius-md) 0;
      padding: 0 20px;
      font-weight: 600;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      h2 { font-size: 30px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero .container { flex-direction: column; }
      .problem-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
      .faq-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .dashboard { flex-direction: column; gap: 30px; }
    }
    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
      .hero-buttons { flex-direction: column; }
    }