/* roulang page: index */
:root {
      --primary: #C2185B;
      --primary-dark: #8E1140;
      --secondary: #FF5722;
      --accent: #00E5FF;
      --dark-bg: #121212;
      --darker-bg: #1A1A1A;
      --gray-text: #555555;
      --light-gray: #F8F8F8;
      --border-light: #EEEEEE;
      --white: #FFFFFF;
      --body-text: #333333;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 12px;
      --transition: 0.25s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--body-text);
      margin: 0;
      line-height: 1.7;
      display: flex;
      min-height: 100vh;
      overflow-x: hidden;
    }

    /* 左侧 App Shell 导航 (桌面端) */
    .app-sidebar {
      position: fixed;
      top: 0;
      left: 0;
      width: 76px;
      height: 100vh;
      background-color: rgba(18, 18, 18, 0.95);
      backdrop-filter: blur(8px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 24px 0;
      z-index: 1050;
      box-shadow: 2px 0 12px rgba(0,0,0,0.2);
      transition: width 0.2s ease;
    }

    .sidebar-logo {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 20px;
      cursor: pointer;
      transition: 0.2s;
      text-decoration: none;
    }

    .nav-icons {
      display: flex;
      flex-direction: column;
      gap: 24px;
      align-items: center;
      flex: 1;
      justify-content: center;
    }

    .nav-icon-item {
      position: relative;
      color: rgba(255,255,255,0.7);
      font-size: 22px;
      width: 44px;
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
      transition: var(--transition);
      text-decoration: none;
    }

    .nav-icon-item:hover,
    .nav-icon-item.active {
      color: var(--accent);
      background: rgba(255,255,255,0.08);
    }

    .nav-tooltip {
      position: absolute;
      left: 60px;
      background: var(--dark-bg);
      color: white;
      padding: 4px 12px;
      border-radius: 6px;
      font-size: 12px;
      white-space: nowrap;
      opacity: 0;
      pointer-events: none;
      transition: 0.2s;
      font-weight: 500;
    }

    .nav-icon-item:hover .nav-tooltip {
      opacity: 1;
      left: 56px;
    }

    .sidebar-bottom {
      display: flex;
      flex-direction: column;
      gap: 18px;
      color: rgba(255,255,255,0.5);
      font-size: 18px;
    }

    /* 主内容区域 */
    .main-content {
      margin-left: 76px;
      width: 100%;
      background: white;
    }

    /* 移动端顶部导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(18,18,18,0.95);
      backdrop-filter: blur(10px);
      z-index: 1040;
      padding: 12px 20px;
      justify-content: space-between;
      align-items: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }

    .mobile-logo {
      font-weight: 700;
      font-size: 24px;
      color: white;
      text-decoration: none;
      letter-spacing: 1px;
    }

    .hamburger {
      font-size: 26px;
      color: white;
      background: none;
      border: none;
    }

    /* 抽屉菜单 */
    .drawer-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.5);
      z-index: 1060;
      opacity: 0;
      visibility: hidden;
      transition: 0.3s;
    }
    .drawer-overlay.show {
      opacity: 1;
      visibility: visible;
    }

    .drawer {
      position: fixed;
      top: 0;
      right: -280px;
      width: 280px;
      height: 100%;
      background: #1E1E1E;
      z-index: 1070;
      padding: 32px 24px;
      transition: right 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .drawer.show {
      right: 0;
    }
    .drawer-close {
      align-self: flex-end;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      margin-bottom: 24px;
    }
    .drawer-nav {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .drawer-nav a {
      color: #ddd;
      font-size: 20px;
      font-weight: 500;
      text-decoration: none;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 42px;
      font-weight: 700;
      color: #1A1A1A;
      margin-bottom: 20px;
      line-height: 1.3;
    }
    .section-sub {
      color: var(--gray-text);
      font-size: 18px;
      max-width: 700px;
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      color: white;
      transition: var(--transition);
      box-shadow: 0 4px 14px rgba(194,24,91,0.3);
    }
    .btn-primary-custom:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 20px rgba(194,24,91,0.4);
      transform: translateY(-1px);
    }
    .btn-outline-custom {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
    }

    /* Hero */
    .hero-section {
      height: 100vh;
      background: linear-gradient(0deg, rgba(0,0,0,0.7) 0%, rgba(18,18,18,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-title {
      font-size: 64px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .highlight {
      color: var(--accent);
    }

    /* 痛点卡片 */
    .pain-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .pain-card:hover {
      transform: translateY(-5px);
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
    }

    /* 数据数字 */
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }

    /* 证言卡 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }
    .testimonial-card:hover {
      transform: scale(1.02);
      box-shadow: var(--shadow-hover);
    }

    /* FAQ 手风琴 */
    .accordion-button:not(.collapsed) {
      background: transparent;
      color: var(--primary);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--primary);
      box-shadow: none;
    }
    .accordion-item {
      border-left: none;
      border-right: none;
    }

    /* 表单 */
    .form-control-underline {
      border: none;
      border-bottom: 1px solid #ccc;
      border-radius: 0;
      padding-left: 0;
      background: transparent;
    }
    .form-control-underline:focus {
      border-bottom: 2px solid var(--primary);
      box-shadow: none;
    }

    footer {
      background: #121212;
      color: #888;
      padding: 32px 0;
    }

    @media (max-width: 991.98px) {
      .app-sidebar {
        display: none;
      }
      .main-content {
        margin-left: 0;
      }
      .mobile-header {
        display: flex;
      }
      .hero-title {
        font-size: 40px;
      }
      section {
        padding: 70px 0;
      }
    }