/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary: #E43D2A;
      --primary-hover: #C83220;
      --secondary: #1A1A2E;
      --accent: #FFB800;
      --accent-light: #FFC940;
      --bg-light: #FAFAFA;
      --bg-section: #F0F0F0;
      --card-bg: #FFFFFF;
      --text-main: #1A1A2E;
      --text-body: #4A4A4A;
      --text-muted: #8A8A8A;
      --border-light: #E0E0E0;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      font-weight: 400;
    }

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

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

    button, input {
      font-family: inherit;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* ----- 导航 ----- */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(26, 26, 46, 0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      z-index: 100;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: -0.3px;
    }
    .logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: #FFFFFF;
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.3s ease;
    }

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

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--secondary);
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        padding: 32px;
        transition: right 0.4s ease;
        box-shadow: -10px 0 30px rgba(0,0,0,0.3);
      }
      .nav-links.open {
        right: 0;
      }
      .menu-toggle {
        display: flex;
        z-index: 110;
      }
      .nav-links a {
        font-size: 20px;
      }
    }

    /* ----- 按钮系统 ----- */
    .btn {
      display: inline-block;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: all 0.3s ease;
      cursor: pointer;
      text-align: center;
      border: 2px solid transparent;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-color: var(--primary);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      border-color: var(--primary-hover);
      transform: scale(1.03);
      box-shadow: 0 10px 20px rgba(228,61,42,0.3);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      padding: 14px 36px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .btn-accent {
      background: var(--accent);
      color: var(--secondary);
      padding: 18px 48px;
      font-weight: 700;
      border-color: var(--accent);
    }
    .btn-accent:hover {
      background: var(--accent-light);
      border-color: var(--accent-light);
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(255,184,0,0.4);
    }

    /* ----- 板块间距 ----- */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    /* ----- Hero ----- */
    .hero {
      background: linear-gradient(0deg, rgba(26,26,46,0.7) 0%, rgba(26,26,46,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      color: white;
    }
    .hero-content {
      max-width: 650px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.5px;
      color: white;
      margin-bottom: 20px;
    }
    .hero h1 span {
      color: var(--accent);
    }
    .hero .subtitle {
      font-size: 20px;
      color: rgba(255,255,255,0.75);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      position: absolute;
      right: 5%;
      bottom: 15%;
      width: 140px;
      height: 140px;
      background: radial-gradient(circle, rgba(228,61,42,0.5) 0%, transparent 70%);
      border-radius: 50%;
      animation: pulse 2.5s infinite;
    }
    @keyframes pulse {
      0% { transform: scale(0.9); opacity: 0.7; }
      50% { transform: scale(1.15); opacity: 1; }
      100% { transform: scale(0.9); opacity: 0.7; }
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
      .hero-visual {
        width: 80px;
        height: 80px;
        right: 10%;
        bottom: 10%;
      }
    }

    /* ----- 痛点区 ----- */
    .pain-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: center;
    }
    .pain-item {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      flex: 1 1 250px;
      box-shadow: var(--shadow-card);
      text-align: center;
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: #FEE9E7;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      color: var(--primary);
      font-size: 28px;
    }

    /* ----- 解决方案网格 2x3 非对称 ----- */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-card .icon-bg {
      width: 56px;
      height: 56px;
      background: #FEE9E7;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 26px;
      margin-bottom: 18px;
    }
    .highlight-card {
      background: var(--secondary);
      color: white;
      grid-column: span 1;
    }
    .highlight-card .icon-bg {
      background: rgba(255,255,255,0.15);
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      .solution-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .solution-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ----- 数据卡片 ----- */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: center;
    }
    .stat-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: center;
      flex: 1 1 180px;
      box-shadow: var(--shadow-card);
    }
    .stat-number {
      font-size: 56px;
      font-weight: 800;
      color: var(--primary);
    }

    /* ----- 证言 ----- */
    .testimonial-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .testimonial {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px;
      flex: 1 1 280px;
      box-shadow: var(--shadow-card);
    }
    .avatar-placeholder {
      width: 48px;
      height: 48px;
      background: #ddd;
      border-radius: 50%;
      margin-bottom: 12px;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
    }

    /* ----- FAQ 手风琴 ----- */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      padding: 20px 0;
      font-weight: 700;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }

    /* ----- CTA band ----- */
    .cta-band {
      background: var(--secondary);
      color: white;
      text-align: center;
    }

    /* ----- 页脚 ----- */
    .footer {
      background: var(--secondary);
      color: #ccc;
      padding: 40px 0;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }
    .footer a {
      color: #ccc;
    }
    .footer a:hover {
      color: var(--accent);
    }