/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --bg-deep: #0F0F14;
      --bg-panel: rgba(22, 22, 30, 0.85);
      --border-subtle: rgba(255, 255, 255, 0.06);
      --text-primary: #FFFFFF;
      --text-body: #B0B5C0;
      --text-muted: #6B7080;
      
      --accent-orange: #FF6A2C;
      --accent-green: #00E5A0;
      --accent-orange-hover: #FF8255;
      --accent-orange-soft: rgba(255, 106, 44, 0.15);
      
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 4px;
      --radius-metric: 16px;
      
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
      --shadow-btn-glow: 0 0 0 3px rgba(255, 106, 44, 0.25);
      
      --font-number: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-system: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      
      --max-width: 1280px;
      --header-height: 64px;
      --bottom-nav-height: 56px;
    }
    
    /* ----- Reset & Base ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--header-height);
    }
    
    body {
      font-family: var(--font-system);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    
    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
      border: none;
      outline: none;
      background: transparent;
    }
    
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* ----- 导航 PC ----- */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(15, 15, 20, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 20px;
      color: var(--text-primary);
      letter-spacing: 0.5px;
    }
    
    .logo-icon {
      width: 8px;
      height: 20px;
      background: var(--accent-orange);
      border-radius: 2px;
      box-shadow: 0 0 10px var(--accent-orange);
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-orange);
      transition: width 0.2s ease;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--text-primary);
    }
    
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    
    /* 移动端底部导航 */
    .bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: var(--bottom-nav-height);
      background: #0F0F14;
      border-top: 1px solid var(--border-subtle);
      z-index: 1000;
      justify-content: space-around;
      align-items: center;
      backdrop-filter: blur(12px);
    }
    
    .bottom-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      color: var(--text-muted);
      font-size: 11px;
      transition: color 0.2s;
    }
    
    .bottom-nav-item i {
      font-size: 18px;
    }
    
    .bottom-nav-item.active {
      color: var(--accent-orange);
    }
    
    /* ----- 区块通用 ----- */
    section {
      padding: 100px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    
    /* ----- 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;
      position: relative;
      padding-top: var(--header-height);
    }
    
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(15,15,20,0.9) 0%, rgba(15,15,20,0.7) 60%, rgba(15,15,20,0.4) 100%);
      z-index: 1;
    }
    
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 60px;
      width: 100%;
    }
    
    .hero-left {
      flex: 1;
    }
    
    .hero-title {
      font-size: clamp(40px, 6vw, 56px);
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-primary);
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 480px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--accent-orange);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s, box-shadow 0.2s, transform 0.1s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
    }
    
    .btn-primary:hover {
      background: var(--accent-orange-hover);
      box-shadow: var(--shadow-btn-glow);
    }
    
    .btn-primary:active {
      transform: scale(0.97);
    }
    
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: border-color 0.2s, background 0.2s;
      cursor: pointer;
    }
    
    .btn-outline:hover {
      border-color: var(--accent-orange);
      background: rgba(255,106,44,0.08);
    }
    
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    
    .dashboard-mock {
      background: var(--bg-panel);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 24px;
      width: 100%;
      max-width: 420px;
      box-shadow: var(--shadow-card);
      backdrop-filter: blur(4px);
    }
    
    .mock-row {
      display: flex;
      justify-content: space-between;
      margin-bottom: 16px;
    }
    
    .mock-gauge {
      height: 8px;
      background: #2a2a35;
      border-radius: 4px;
      overflow: hidden;
      margin: 12px 0;
    }
    
    .gauge-fill {
      width: 78%;
      height: 100%;
      background: var(--accent-green);
      border-radius: 4px;
    }
    
    .mock-stat {
      font-family: var(--font-number);
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-green);
    }
    
    /* ----- 指标看板 ----- */
    #metrics .container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .metric-card {
      background: var(--bg-panel);
      border-radius: var(--radius-metric);
      padding: 28px 20px;
      text-align: center;
      border: 1px solid var(--border-subtle);
      border-top: 2px solid var(--accent-orange);
      box-shadow: var(--shadow-card);
    }
    
    .metric-number {
      font-family: var(--font-number);
      font-size: 40px;
      font-weight: 700;
      color: var(--accent-green);
      margin-bottom: 8px;
    }
    
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    
    /* ----- 服务矩阵 ----- */
    #services .container {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .service-card {
      background: var(--bg-panel);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: transform 0.25s ease, box-shadow 0.25s;
      box-shadow: var(--shadow-card);
    }
    
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 32px rgba(0,0,0,0.5);
    }
    
    .service-img {
      width: 100%;
      aspect-ratio: 16 / 9;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    
    .service-card:hover .service-img {
      transform: scale(1.03);
    }
    
    .service-body {
      padding: 24px;
    }
    
    .service-body h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 10px;
    }
    
    .service-desc {
      font-size: 15px;
      color: var(--text-body);
      margin-bottom: 16px;
      line-height: 1.6;
    }
    
    .tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    
    .tag {
      background: var(--accent-orange-soft);
      color: var(--accent-orange);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
    }
    
    /* ----- 对比表 ----- */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      overflow: hidden;
      background: var(--bg-panel);
    }
    
    .comp-col {
      padding: 32px;
    }
    
    .comp-left {
      background: rgba(255,255,255,0.02);
    }
    
    .comp-right {
      background: rgba(255,106,44,0.03);
    }
    
    .comp-header {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    .comp-header i {
      color: var(--accent-orange);
    }
    
    .comp-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 0;
      border-bottom: 1px solid var(--border-subtle);
    }
    
    .comp-row:last-child {
      border-bottom: none;
    }
    
    .check-green {
      color: var(--accent-green);
      font-weight: 600;
    }
    
    .text-dim {
      color: var(--text-muted);
    }
    
    /* ----- FAQ ----- */
    .faq-item {
      border-top: 1px solid var(--border-subtle);
      padding: 20px 0;
      cursor: pointer;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 18px;
      color: var(--text-primary);
    }
    
    .faq-icon {
      font-size: 20px;
      transition: transform 0.3s ease;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-body);
    }
    
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    
    /* ----- CTA 表单 ----- */
    #contact {
      background: #0a0a0f;
    }
    
    .cta-title {
      font-size: 36px;
      font-weight: 700;
      color: #fff;
      text-align: center;
      margin-bottom: 16px;
    }
    
    .form-row {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin-top: 32px;
      justify-content: center;
    }
    
    .input-group {
      flex: 1;
      min-width: 200px;
    }
    
    .input-group input,
    .input-group textarea {
      width: 100%;
      padding: 12px 0;
      background: transparent;
      border-bottom: 1px solid #3a3a45;
      color: #fff;
      font-size: 16px;
      transition: border-color 0.2s, box-shadow 0.2s;
    }
    
    .input-group input:focus,
    .input-group textarea:focus {
      border-bottom-color: var(--accent-orange);
      box-shadow: 0 4px 8px -4px var(--accent-orange);
    }
    
    /* ----- 页脚 ----- */
    .site-footer {
      background: #0a0a0f;
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
    }
    
    .footer-col h4 {
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 1px;
      color: #fff;
      margin-bottom: 16px;
      text-transform: uppercase;
    }
    
    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 8px;
      font-size: 15px;
    }
    
    .footer-links a:hover {
      color: var(--accent-orange);
    }
    
    .copyright {
      text-align: center;
      color: var(--text-muted);
      font-size: 13px;
      margin-top: 40px;
      border-top: 1px solid var(--border-subtle);
      padding-top: 20px;
    }
    
    /* ----- 响应式 ----- */
    @media (max-width: 1024px) {
      #services .container { grid-template-columns: repeat(2, 1fr); }
      .comparison-grid { grid-template-columns: 1fr; }
    }
    
    @media (max-width: 768px) {
      .site-header { display: none; }
      .bottom-nav { display: flex; }
      
      #hero { padding-bottom: 30px; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero-buttons { justify-content: center; }
      
      #metrics .container { grid-template-columns: 1fr 1fr; }
      #services .container { grid-template-columns: 1fr; }
      
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .form-row { flex-direction: column; }
      
      body { padding-bottom: var(--bottom-nav-height); }
    }