/* roulang page: index */
:root {
      --brand-main-start: #E81E5B;
      --brand-main-end: #FF7F3F;
      --brand-gradient: linear-gradient(135deg, #E81E5B 0%, #FF7F3F 100%);
      --brand-accent: #00C9A7;
      --deep-bg: #2D2A3A;
      --warm-bg: #FFFAF5;
      --card-bg: #FDFBFA;
      --neutral-light: #F5F3F0;
      --neutral-border: #E0DCD7;
      --neutral-mid: #8A8580;
      --text-dark: #1E1B1C;
      --text-body: #3A3634;
      --text-weak: #8A8580;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-pill: 24px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 4px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.08);
      --transition-smooth: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--warm-bg);
      color: var(--text-body);
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: var(--brand-main-start);
      transition: color 0.2s;
    }
    a:hover {
      color: var(--brand-main-end);
    }
    button, .button {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航双层 Tabs */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,250,245,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--neutral-border);
    }
    .nav-row-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .brand-logo {
      font-size: 1.6rem;
      font-weight: 700;
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .search-icon {
      font-size: 1.2rem;
      color: var(--text-dark);
      background: none;
      border: none;
    }
    .btn-primary-sm {
      background: var(--brand-gradient);
      color: white;
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: transform 0.2s, box-shadow 0.2s;
      white-space: nowrap;
    }
    .btn-primary-sm:hover {
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(232,30,91,0.3);
    }
    .nav-row-bottom {
      height: 48px;
      background: var(--neutral-light);
      border-radius: 30px;
      margin: 8px 0 12px;
      overflow-x: auto;
      white-space: nowrap;
      display: flex;
      align-items: center;
      padding: 0 8px;
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    .nav-row-bottom::-webkit-scrollbar {
      display: none;
    }
    .nav-pill {
      display: inline-block;
      padding: 8px 18px;
      border-radius: 20px;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-body);
      background: transparent;
      transition: background 0.2s, color 0.2s;
      margin: 0 4px;
    }
    .nav-pill:hover, .nav-pill.active {
      background: var(--brand-gradient);
      color: white;
    }
    /* Hero */
    #hero {
      background: linear-gradient(125deg, #2D2A3A 0%, #3A2E3F 100%);
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      color: white;
    }
    #hero .container {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
      position: relative;
      z-index: 2;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero-text h1 {
      font-size: clamp(2.2rem, 6vw, 3.5rem);
      font-weight: 700;
      line-height: 1.2;
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1rem;
    }
    .hero-text .sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
      color: rgba(255,255,245,0.8);
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--brand-gradient);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      box-shadow: 0 6px 18px rgba(232,30,91,0.4);
      transition: 0.2s;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 10px 24px rgba(232,30,91,0.5);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
    }
    .btn-secondary:hover {
      background: rgba(255,255,255,0.1);
    }
    .hero-visual {
      flex: 1 1 350px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 350px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    /* 通用区块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--deep-bg);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-weak);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 28px;
    }
    .pain-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      border-left: 6px solid var(--brand-main-start);
      transition: var(--transition-smooth);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .pain-icon {
      font-size: 2rem;
      color: var(--brand-main-start);
      margin-bottom: 16px;
    }
    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 28px;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      text-align: center;
      border-top: 4px solid transparent;
      border-image: var(--brand-gradient) 1;
      transition: var(--transition-smooth);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .solution-icon {
      font-size: 2.4rem;
      margin-bottom: 18px;
      color: var(--brand-main-end);
    }
    .data-badge {
      display: inline-block;
      background: var(--brand-gradient);
      color: white;
      border-radius: 24px;
      padding: 6px 18px;
      font-weight: 700;
      font-size: 1rem;
      margin-top: 16px;
    }
    /* 数据徽章区 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 40px;
      text-align: center;
    }
    .stat-item {
      background: var(--neutral-light);
      border-radius: 24px;
      padding: 24px 36px;
      min-width: 160px;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 28px;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 4rem;
      color: var(--brand-main-start);
      opacity: 0.2;
      position: absolute;
      top: 10px;
      left: 20px;
      font-family: serif;
    }
    .quote {
      font-style: italic;
      margin-bottom: 20px;
      color: var(--text-body);
    }
    .author {
      font-weight: 600;
      color: var(--deep-bg);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .faq-question {
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1.05rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--deep-bg);
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 最终CTA */
    #cta-final {
      background: var(--brand-gradient);
      text-align: center;
      color: white;
      padding: 80px 20px;
    }
    #cta-final h2 {
      font-size: 2.5rem;
      font-weight: 700;
    }
    .footer {
      background: var(--deep-bg);
      color: #ccc;
      padding: 60px 20px 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 36px;
      max-width: 1200px;
      margin: 0 auto 30px;
    }
    .footer-brand {
      font-size: 1.8rem;
      font-weight: 700;
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .footer a {
      color: #ddd;
    }
    .footer a:hover {
      color: var(--brand-main-end);
    }
    .copyright {
      border-top: 1px solid #444;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      #hero .container {
        flex-direction: column;
      }
      .hero-visual {
        height: 250px;
        width: 100%;
        order: -1;
      }
    }