/* roulang page: index */
:root {
      --primary: #0A84FF;
      --primary-dark: #0066CC;
      --accent: #FF6B35;
      --bg-page: #FAFAFA;
      --bg-card: #FFFFFF;
      --bg-dark: #1A1A1A;
      --bg-light: #F0F2F5;
      --text-main: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-muted: #8C8C8C;
      --text-on-dark: #E0E0E0;
      --border-light: #E5E5E5;
      --border-glow: rgba(10,132,255,0.15);
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-glow: 0 0 20px rgba(10,132,255,0.3);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", "Consolas", monospace;
      --transition-base: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --container-max: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 17px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .container {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 40px;
      padding-right: 40px;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.06);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 40px;
    }

    .logo {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 26px;
      letter-spacing: 1px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      font-size: 28px;
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 40px;
      list-style: none;
      align-items: center;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 4px 0;
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -4px;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

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

    .nav-links a.active {
      color: var(--primary);
    }

    .burger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .burger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: var(--transition-base);
    }

    .mobile-panel {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(26,26,26,0.97);
      z-index: 999;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
    }
    .mobile-panel.open {
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-panel a {
      font-size: 26px;
      color: white;
      font-weight: 500;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center 20%;
      position: relative;
      margin-top: 0;
      padding-top: var(--header-height);
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,132,255,0.15) 0%, rgba(26,26,26,0.6) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-text {
      flex: 1 1 50%;
      color: white;
    }
    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.15;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero h1 .highlight {
      color: var(--accent);
    }
    .hero-sub {
      font-size: 20px;
      color: rgba(255,255,255,0.8);
      max-width: 560px;
      margin-bottom: 40px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: #E55A2B;
    }
    .btn-outline {
      border: 1.5px solid rgba(255,255,255,0.7);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      background: transparent;
      font-size: 16px;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.1);
    }
    .hero-badge {
      position: absolute;
      right: 40px;
      bottom: 60px;
      background: rgba(26,26,26,0.8);
      border: 1px solid rgba(10,132,255,0.4);
      border-radius: 12px;
      padding: 16px 24px;
      color: white;
      backdrop-filter: blur(8px);
      z-index: 3;
    }
    .badge-number {
      font-family: var(--font-mono);
      font-size: 38px;
      font-weight: 700;
      color: var(--primary);
      text-shadow: var(--shadow-glow);
    }

    /* 通用区块 */
    .section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 42px;
      font-weight: 600;
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      position: relative;
      overflow: hidden;
      transition: var(--transition-base);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .feature-decor {
      height: 4px;
      width: 100%;
      background: url('/assets/images/coverpic/cover-3.webp') center/cover;
      opacity: 0.3;
      margin-bottom: 24px;
    }
    .feature-number {
      font-family: var(--font-mono);
      font-size: 64px;
      font-weight: 700;
      color: var(--primary);
      opacity: 0.1;
      position: absolute;
      top: 20px;
      right: 20px;
    }
    .feature-title {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .feature-desc {
      color: var(--text-secondary);
    }

    /* 解决方案 */
    .solution-row {
      display: flex;
      gap: 60px;
      align-items: center;
      margin-bottom: 100px;
    }
    .solution-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .solution-text {
      flex: 1;
    }
    .solution-text h3 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .param-list {
      list-style: none;
      margin-top: 20px;
    }
    .param-list li {
      display: flex;
      align-items: baseline;
      gap: 8px;
      margin-bottom: 8px;
      font-weight: 500;
    }
    .param-number {
      font-family: var(--font-mono);
      color: var(--accent);
      font-weight: 700;
    }

    /* 数据看板 */
    .dark-bg {
      background: var(--bg-dark);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .stat-card {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 12px;
      padding: 32px 24px;
      text-align: center;
      transition: var(--transition-base);
    }
    .stat-card:hover {
      border-color: rgba(10,132,255,0.4);
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      text-shadow: var(--shadow-glow);
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
    }
    .testimonial-card {
      flex: 0 0 400px;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary);
      scroll-snap-align: start;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 500;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A84FF, #0066CC);
      padding: 100px 0;
      text-align: center;
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 20px;
      margin-top: 40px;
      text-align: right;
      color: #6C6C6C;
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .hero h1 { font-size: 42px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .burger { display: flex; }
      .mobile-panel { display: flex; }
      .features-grid { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
      .hero-grid { flex-direction: column; }
      .hero-badge { position: static; margin-top: 24px; }
      .footer-grid { grid-template-columns: 1fr; }
      .section { padding: 80px 0; }
      .hero h1 { font-size: 36px; }
    }