/* roulang page: index */
:root {
      --primary: #0A4D3C;
      --primary-dark: #083D30;
      --primary-light: rgba(10, 77, 60, 0.1);
      --accent: #F85E2D;
      --accent-dark: #E04A1E;
      --bg: #F5F7FA;
      --surface: #FFFFFF;
      --dark-bg: #0A2E26;
      --text-primary: #1A1A1A;
      --text-secondary: #4A4A4A;
      --text-muted: #8C8C8C;
      --text-on-dark: #FFFFFF;
      --text-on-dark-muted: #B0CCC6;
      --border-light: #E5E7EB;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(10,77,60,0.08);
      --shadow-btn: 0 6px 20px rgba(248,94,45,0.25);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-full: 20px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --font-title: "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
      --font-data: "DIN Alternate", "PingFang SC", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text-secondary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      padding-bottom: 80px; /* 移动端底部导航高度 */
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
    }

    @media (min-width: 768px) {
      .container {
        padding: 0 40px;
      }
    }

    /* 导航 - PC 顶部固定 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--surface);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      box-shadow: 0 1px 0 rgba(0,0,0,0.02);
      transition: var(--transition);
    }

    .main-header.scrolled {
      box-shadow: 0 2px 20px rgba(0,0,0,0.06);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      font-family: var(--font-title);
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 1.2rem;
    }

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

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

    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--primary);
    }

    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: var(--transition);
    }

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

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      box-shadow: 0 2px 8px rgba(248,94,45,0.2);
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--accent-dark);
      box-shadow: var(--shadow-btn);
      transform: scale(1.02);
    }

    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--primary-light);
    }

    .btn-lg {
      padding: 18px 40px;
      font-size: 1.1rem;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: var(--surface);
      box-shadow: 0 -2px 20px rgba(0,0,0,0.06);
      z-index: 1000;
      height: 64px;
      padding: 0 16px;
    }

    .mobile-nav-list {
      display: flex;
      align-items: center;
      justify-content: space-around;
      height: 100%;
      list-style: none;
    }

    .mobile-nav-item a {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      font-size: 0.7rem;
      color: var(--text-muted);
      transition: var(--transition);
      font-weight: 500;
    }

    .mobile-nav-item a.active {
      color: var(--primary);
    }

    .mobile-nav-icon {
      font-size: 1.4rem;
      line-height: 1;
    }

    @media (max-width: 1024px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: block;
      }
      body {
        padding-bottom: 80px;
      }
      .main-header {
        height: 64px;
      }
    }

    @media (min-width: 1025px) {
      .mobile-bottom-nav {
        display: none;
      }
      body {
        padding-bottom: 0;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    .section-title {
      font-family: var(--font-title);
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
    }

    .section-subtitle {
      color: var(--text-muted);
      margin-bottom: 48px;
    }

    /* Hero */
    .hero {
      padding-top: 120px;
      background: var(--surface);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content .badge {
      display: inline-block;
      background: var(--primary-light);
      color: var(--primary);
      padding: 6px 16px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 0.9rem;
      margin-bottom: 20px;
    }

    .hero-content h1 {
      font-size: 3rem;
      font-weight: 800;
      font-family: var(--font-title);
      color: var(--text-primary);
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }

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

    .hero-visual {
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .hero-visual::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,77,60,0.7), rgba(10,46,38,0.8));
    }

    .login-mock-card {
      position: relative;
      z-index: 2;
      background: white;
      border-radius: 20px;
      padding: 24px;
      width: 260px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.25);
      transform: rotate(-2deg);
      transition: var(--transition);
    }

    .login-mock-card:hover {
      transform: rotate(0deg) scale(1.02);
    }

    .mock-input {
      height: 40px;
      background: #f3f4f6;
      border-radius: 8px;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      padding: 0 12px;
      color: #9ca3af;
      font-size: 0.9rem;
    }

    .mock-btn {
      background: var(--accent);
      color: white;
      text-align: center;
      padding: 12px;
      border-radius: 8px;
      font-weight: 600;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-visual {
        order: -1;
        min-height: 280px;
      }
      .hero-content h1 {
        font-size: 2.2rem;
      }
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pain-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--accent);
      transition: var(--transition);
      position: relative;
    }

    .pain-card:hover {
      border-left-width: 8px;
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }

    .pain-icon {
      font-size: 2rem;
      margin-bottom: 16px;
      color: var(--accent);
    }

    .pain-card h3 {
      font-family: var(--font-title);
      color: var(--text-primary);
      margin-bottom: 8px;
    }

    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案图文 */
    .solution-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 60px;
    }

    .solution-img {
      background: #E8F0ED;
      border-radius: 24px;
      aspect-ratio: 16/9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .solution-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .solution-text h3 {
      font-family: var(--font-title);
      font-size: 1.8rem;
      color: var(--text-primary);
      margin-bottom: 16px;
    }

    .feature-list {
      list-style: none;
      margin-top: 16px;
    }

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
      color: var(--primary);
      font-weight: 500;
    }

    @media (max-width: 1024px) {
      .solution-row {
        grid-template-columns: 1fr;
      }
      .solution-row.reverse {
        display: flex;
        flex-direction: column-reverse;
      }
    }

    /* 数据深色区 */
    .dark-section {
      background: var(--dark-bg);
      color: white;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-data);
      font-size: 3rem;
      color: var(--accent);
      font-weight: 700;
    }

    .stat-label {
      color: var(--text-on-dark-muted);
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: var(--surface);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: var(--transition);
    }

    .testimonial-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-card-hover);
    }

    .stars {
      color: var(--accent);
      margin-bottom: 12px;
    }

    @media (max-width: 768px) {
      .testimonial-grid {
        grid-template-columns: 1fr;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        display: flex;
        gap: 16px;
        padding-bottom: 16px;
      }
      .testimonial-card {
        min-width: 280px;
        scroll-snap-align: start;
      }
    }

    /* FAQ */
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary);
      transition: var(--transition);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-secondary);
    }

    .faq-item.active {
      border-left-color: var(--accent);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }

    /* CTA */
    .cta-section {
      background: var(--dark-bg);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .watermark-bg {
      position: absolute;
      inset: 0;
      opacity: 0.05;
      background-image: radial-gradient(circle at 20% 30%, white 1px, transparent 1px);
      background-size: 40px 40px;
    }

    .footer {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    .fade-up {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }