/* roulang page: index */
:root {
      --primary-purple: #7C3AED;
      --primary-orange: #F97316;
      --deep-blue: #1E1B2E;
      --bg-warm: #FAFAFA;
      --white: #FFFFFF;
      --text-main: #111827;
      --text-secondary: #4B5563;
      --text-muted: #9CA3AF;
      --success-green: #10B981;
      --danger-red: #EF4444;
      --border-light: #E5E7EB;
      --card-shadow: 0 2px 8px rgba(0,0,0,0.06);
      --card-hover-shadow: 0 8px 24px rgba(124,58,237,0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --spacing-section: 80px;
      --max-width: 1200px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    #header {
      background: var(--white);
      height: 64px;
      box-shadow: 0 1px 0 var(--border-light);
      position: sticky;
      top: 0;
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-family: var(--font-heading);
      font-size: 22px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-orange) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo-icon {
      font-size: 24px;
      display: inline-block;
    }

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

    .nav-menu a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-purple);
      transition: width 0.25s ease;
    }

    .nav-menu a:hover {
      color: var(--primary-purple);
    }

    .nav-menu a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 4px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: 0.3s;
    }

    /* 移动端导航 */
    @media (max-width: 767px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--primary-purple);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 36px;
        transition: right 0.35s ease;
        box-shadow: -4px 0 20px rgba(0,0,0,0.15);
        z-index: 200;
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-menu a {
        color: white;
        font-size: 20px;
        font-weight: 600;
      }
      .nav-menu a:hover {
        color: var(--primary-orange);
      }
      .hamburger {
        display: flex;
        z-index: 250;
      }
      .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px,5px);
      }
      .hamburger.active span:nth-child(2) {
        opacity: 0;
      }
      .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px,-5px);
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, var(--deep-blue) 0%, #2D2640 100%);
      padding: 80px 0;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }

    .hero-text {
      flex: 1 1 400px;
    }

    .hero h1 {
      font-family: var(--font-heading);
      font-size: 40px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: white;
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .hero-sub {
      font-size: 18px;
      color: #A78BFA;
      margin-bottom: 32px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-orange);
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      border: none;
      letter-spacing: 0.5px;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 4px 10px rgba(249,115,22,0.4);
    }

    .btn-primary:hover {
      background: #EA580C;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(249,115,22,0.5);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid white;
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: white;
      color: var(--primary-purple);
    }

    .hero-image {
      flex: 1 1 300px;
      text-align: center;
    }

    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 35px rgba(0,0,0,0.5);
    }

    @media (max-width: 767px) {
      .hero h1 {
        font-size: 32px;
      }
      .hero {
        padding: 60px 0;
      }
    }

    /* 通用板块 */
    section {
      padding: var(--spacing-section) 0;
    }

    .section-title {
      font-family: var(--font-heading);
      font-size: 28px;
      font-weight: 700;
      letter-spacing: -0.3px;
      margin-bottom: 48px;
      text-align: center;
      color: var(--text-main);
    }

    @media (max-width: 767px) {
      .section-title {
        font-size: 24px;
      }
      section {
        padding: 60px 0;
      }
    }

    /* 痛点 */
    .pain-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }

    .pain-card {
      background: #F3F4F6;
      border-radius: var(--radius-lg);
      padding: 24px;
      flex: 1 1 250px;
      border-left: 4px solid var(--primary-purple);
    }

    .pain-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .pain-card p {
      color: #6B7280;
      font-size: 14px;
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 24px;
    }

    .solution-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--card-shadow);
      border-top: 8px solid var(--primary-purple);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }

    .solution-icon {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, var(--primary-purple), var(--primary-orange));
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 24px;
      margin-bottom: 16px;
    }

    /* 成果 */
    .stats {
      background: var(--deep-blue);
      color: white;
      display: flex;
      justify-content: center;
      gap: 48px;
      flex-wrap: wrap;
      text-align: center;
      padding: 48px 24px;
      border-radius: var(--radius-lg);
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      background: linear-gradient(to right, #F97316, #FB923C);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      color: #A78BFA;
      font-size: 14px;
    }

    /* 证言 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }

    .testimonial-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 24px;
      min-width: 280px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ddd;
      margin-bottom: 12px;
      border: 2px solid var(--primary-purple);
    }

    .stars {
      color: #F97316;
      margin-bottom: 8px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
    }

    .faq-question {
      padding: 16px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 16px;
    }

    .faq-answer {
      padding: 0 24px 16px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active {
      border-color: var(--primary-purple);
    }

    /* 终极CTA */
    .cta-section {
      background: linear-gradient(135deg, #7C3AED, #F97316);
      color: white;
      text-align: center;
      padding: 80px 24px;
      border-radius: var(--radius-lg);
      margin: 0 24px;
    }

    .download-buttons {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
      margin-top: 32px;
    }

    .btn-ios, .btn-android {
      padding: 14px 36px;
      border-radius: var(--radius-md);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .btn-ios {
      background: #111;
      color: white;
    }

    .btn-android {
      background: white;
      color: var(--primary-purple);
    }

    footer {
      background: var(--deep-blue);
      color: white;
      text-align: center;
      padding: 40px 24px;
      font-size: 14px;
    }