/* roulang page: index */
:root {
      --primary: #E9402B;
      --primary-dark: #c53025;
      --secondary-dark: #1A1A2E;
      --secondary-light: #F5F0EB;
      --accent-green: #00E5A0;
      --text-white: #FFFFFF;
      --text-light-muted: #B0B0C0;
      --text-dark: #1A1A2E;
      --text-muted-dark: #555566;
      --card-shadow: 0 4px 24px rgba(26, 26, 46, 0.08);
      --card-shadow-hover: 0 12px 32px rgba(233, 64, 43, 0.15);
      --border-light: rgba(233, 64, 43, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: 0.3s ease;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'DIN Alternate', 'PingFang SC', sans-serif;
      --max-width: 1280px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.75;
      background-color: var(--secondary-light);
      color: var(--text-dark);
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      border: none;
      background: none;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }

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

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      background: transparent;
      transition: background 0.35s ease, box-shadow 0.35s ease;
    }

    .navbar.scrolled {
      background: #FFFFFF;
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .logo {
      font-family: var(--font-title);
      font-size: 24px;
      font-weight: 800;
      color: #FFFFFF;
      letter-spacing: -0.5px;
      transition: color var(--transition);
    }

    .navbar.scrolled .logo {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: rgba(255,255,255,0.9);
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }

    .navbar.scrolled .nav-links a {
      color: var(--text-dark);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      transition: width var(--transition);
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      box-shadow: 0 8px 18px rgba(233,64,43,0.25);
    }

    .btn-primary:hover {
      background: #ff5a4a;
      transform: scale(0.97);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 12px 28px;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
      transform: scale(0.97);
    }

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

    .navbar.scrolled .hamburger {
      color: var(--text-dark);
    }

    /* Hero */
    .hero {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      color: white;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(233,64,43,0.5) 100%);
    }

    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .hero-title {
      font-size: 52px;
      font-weight: 900;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 40px;
      max-width: 450px;
    }

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

    .hero-image {
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-image img {
      max-height: 420px;
      border-radius: var(--radius-lg);
      box-shadow: 0 30px 50px rgba(0,0,0,0.5);
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 38px;
      font-weight: 800;
      margin-bottom: 16px;
      letter-spacing: -0.02em;
    }

    .section-desc {
      font-size: 18px;
      color: var(--text-muted-dark);
      margin-bottom: 56px;
      max-width: 700px;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .pain-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--primary);
      transition: var(--transition);
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }

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

    .pain-icon {
      font-size: 36px;
      color: var(--accent-green);
    }

    /* 解决方案卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .solution-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 36px 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .solution-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--card-shadow-hover);
    }

    .solution-icon {
      font-size: 48px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .solution-list {
      list-style: none;
      margin-top: 20px;
    }

    .solution-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-muted-dark);
    }

    .solution-list i {
      color: var(--accent-green);
    }

    /* 数据区 */
    .stats-section {
      background: var(--secondary-dark);
      color: white;
      text-align: center;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    .stat-item {
      font-family: var(--font-number);
    }

    .stat-number {
      font-size: 56px;
      font-weight: 700;
      color: var(--primary);
    }

    /* 证言区 */
    .testimonial-layout {
      display: grid;
      grid-template-columns: 7fr 5fr;
      gap: 40px;
      align-items: start;
    }

    .main-testimonial {
      background: white;
      padding: 40px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      position: relative;
    }

    .quote-icon {
      font-size: 60px;
      color: rgba(233,64,43,0.2);
      position: absolute;
      top: 20px;
      left: 20px;
    }

    .testimonial-text {
      font-size: 20px;
      line-height: 1.8;
      margin: 30px 0 24px;
    }

    .author {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .author img {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      object-fit: cover;
    }

    .side-testimonials {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .side-card {
      background: white;
      padding: 20px;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--primary);
      box-shadow: var(--card-shadow);
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

    .faq-question {
      padding: 20px 28px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 28px 20px;
      display: none;
      color: var(--text-muted-dark);
      border-left: 3px solid var(--accent-green);
      margin-left: 28px;
    }

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

    /* CTA */
    .cta-section {
      background: var(--secondary-dark);
      text-align: center;
      color: white;
      padding: 100px 0;
    }

    .pulse-btn {
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(233,64,43,0.7); }
      70% { box-shadow: 0 0 0 18px rgba(233,64,43,0); }
      100% { box-shadow: 0 0 0 0 rgba(233,64,43,0); }
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .social-icons i {
      font-size: 22px;
      margin-right: 16px;
      transition: color 0.2s;
    }

    .social-icons i:hover {
      color: var(--primary);
    }

    @media (max-width: 1024px) {
      .hero .container { grid-template-columns: 1fr; }
      .cards-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .testimonial-layout { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .pain-grid, .cards-grid, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }