/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --color-primary: #0B2B26;
      --color-accent-lime: #C8FF00;
      --color-accent-copper: #C87A4A;
      --color-bg-warm: #F7F5F2;
      --color-bg-dark: #0A1F1B;
      --color-text-main: #1A1A1A;
      --color-text-sub: #5C5C5C;
      --color-text-light: #F0F0F0;
      --color-border: #E0DDD8;
      --color-card-bg: #FFFFFF;
      --color-card-light: #F2F0EC;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui;
      --radius-card: 8px;
      --radius-btn: 4px;
      --shadow-hover: 0 8px 30px rgba(11,43,38,0.08);
      --transition-smooth: 0.2s ease;
      --section-padding: 80px;
    }
    
    /* ----- 基础重置 ----- */
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.75;
      color: var(--color-text-main);
      background-color: var(--color-bg-warm);
      -webkit-font-smoothing: antialiased;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; }
    button, .button { cursor: pointer; font-family: inherit; }
    
    /* ----- 布局容器定制 ----- */
    .grid-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-padding {
      padding: var(--section-padding) 0;
    }
    @media (max-width: 640px) {
      .section-padding { padding: 48px 0; }
    }
    
    /* ----- 导航系统 （频道Tabs双层） ----- */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: #FFFFFF;
      border-bottom: 1px solid rgba(0,0,0,0.04);
    }
    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
      flex-wrap: wrap;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .logo-text {
      font-size: 22px;
      font-weight: 800;
      color: var(--color-primary);
      letter-spacing: -0.3px;
    }
    .logo-divider {
      width: 1px;
      height: 18px;
      background: var(--color-border);
      margin: 0 6px;
    }
    .logo-sub {
      font-size: 13px;
      color: var(--color-text-sub);
      font-weight: 400;
    }
    .brand-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-icon {
      font-size: 16px;
      color: var(--color-text-sub);
      cursor: default;
    }
    .btn-primary-small {
      background: var(--color-accent-lime);
      color: var(--color-primary);
      font-weight: 700;
      font-size: 13px;
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      border: none;
      transition: var(--transition-smooth);
    }
    .btn-primary-small:hover {
      background: #B3E600;
      transform: scale(1.03);
    }
    
    .tabs-row {
      display: flex;
      align-items: center;
      gap: 4px;
      padding: 8px 0 12px;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    .tabs-row::-webkit-scrollbar { display: none; }
    .tab-pill {
      padding: 6px 18px;
      font-size: 14px;
      font-weight: 500;
      color: var(--color-text-sub);
      border-radius: 20px;
      transition: var(--transition-smooth);
      background: transparent;
      border-bottom: 3px solid transparent;
    }
    .tab-pill.active, .tab-pill:hover {
      color: var(--color-primary);
      border-bottom-color: var(--color-accent-lime);
    }
    
    /* ----- 按钮全局 ----- */
    .btn-primary {
      background: var(--color-accent-lime);
      color: var(--color-primary);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      display: inline-block;
      transition: var(--transition-smooth);
    }
    .btn-primary:hover {
      background: #B3E600;
      transform: scale(1.03);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: var(--transition-smooth);
    }
    .btn-secondary:hover {
      background: var(--color-primary);
      color: #FFFFFF;
    }
    .text-link {
      color: var(--color-accent-lime);
      text-decoration: underline;
      font-weight: 500;
      transition: var(--transition-smooth);
    }
    .text-link:hover {
      color: var(--color-accent-copper);
      text-decoration: none;
    }
    
    /* ----- 板块标题装饰 ----- */
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 48px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 4px;
      background: var(--color-accent-lime);
      margin-top: 8px;
    }
    @media (max-width: 640px) {
      .section-title { font-size: 28px; }
    }
    
    /* ----- Hero ----- */
    .hero-section {
      position: relative;
      min-height: 560px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      background: linear-gradient(135deg, rgba(11,43,38,0.85) 0%, rgba(11,43,38,0.45) 100%);
      width: 100%;
      padding: 100px 0;
    }
    .hero-content {
      color: var(--color-text-light);
    }
    .hero-tag {
      background: var(--color-accent-lime);
      color: var(--color-primary);
      font-weight: 700;
      font-size: 13px;
      padding: 6px 16px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .hero-sub {
      font-size: 18px;
      max-width: 560px;
      color: #D0D0D0;
      margin-bottom: 32px;
    }
    .hero-stats {
      display: flex;
      gap: 40px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    .stat-item h3 {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 800;
      color: var(--color-accent-lime);
    }
    .stat-item p {
      font-size: 14px;
      color: #CCC;
    }
    @media (max-width: 640px) {
      .hero-title { font-size: 34px; }
      .hero-stats { gap: 20px; }
    }
    
    /* ----- 痛点卡片 ----- */
    .pain-card {
      background: var(--color-card-bg);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      transition: var(--transition-smooth);
    }
    .pain-card:hover {
      border-color: var(--color-accent-lime);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .pain-icon {
      font-size: 28px;
      color: var(--color-accent-lime);
      margin-bottom: 16px;
    }
    
    /* ----- 方案卡片 ----- */
    .solution-card {
      background: #FFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: var(--transition-smooth);
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-img {
      height: 160px;
      background: #E8E6E1;
      overflow: hidden;
    }
    .solution-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .solution-card:hover .solution-img img {
      transform: scale(1.03);
    }
    
    /* ----- 数据看板 ----- */
    .results-bar {
      background: linear-gradient(135deg, #0B2B26, #0A1F1B);
    }
    .metric-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 800;
      color: var(--color-accent-lime);
    }
    
    /* ----- 证言卡片 ----- */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .testimonial-card {
      min-width: 300px;
      background: #F2F0EC;
      border-left: 4px solid var(--color-accent-lime);
      padding: 24px;
      border-radius: 6px;
      flex-shrink: 0;
    }
    
    /* ----- FAQ手风琴 ----- */
    .accordion-title {
      font-weight: 600;
      color: var(--color-primary);
      background: #FAF9F7;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }
    .accordion-item.is-active .accordion-title {
      border-left-color: var(--color-accent-lime);
    }
    
    /* ----- 页脚 ----- */
    .site-footer {
      background: var(--color-primary);
      color: #CCCCCC;
    }
    .footer-links a {
      color: #BBB;
      display: block;
      margin-bottom: 6px;
      transition: 0.2s;
    }
    .footer-links a:hover { color: var(--color-accent-lime); }
    
    /* 动效 */
    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s, transform 0.6s;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }