/* roulang page: index */
:root {
      --primary-deep: #0F0F0F;
      --accent-orange: #FF4C00;
      --accent-gold: #D4A853;
      --bg-white: #FFFFFF;
      --bg-light-gray: #F5F5F5;
      --text-dark: #1A1A1A;
      --text-mid: #6B6B6B;
      --text-light: #FFFFFF;
      --success-green: #0E8C3A;
      --danger-red: #C0392B;
      --border-light: #E5E5E5;
      --radius-card: 12px;
      --radius-button: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 12px 30px rgba(0,0,0,0.12);
      --transition-smooth: 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "Segoe UI", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      font-size: 16px;
      font-weight: 400;
      line-height: 1.7;
      color: var(--text-dark);
      background-color: var(--bg-white);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.25s, color 0.25s, transform 0.2s, box-shadow 0.25s;
      border-radius: var(--radius-button);
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      font-size: 16px;
      padding: 12px 28px;
    }

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

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      padding: 16px 0;
    }

    .site-header.scrolled {
      background: rgba(15,15,15,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo {
      font-family: var(--font-en);
      font-size: 24px;
      font-weight: 800;
      color: var(--accent-orange);
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: rgba(255,255,255,0.8);
      transition: color 0.2s;
    }
    .site-header.scrolled .nav-links a {
      color: rgba(255,255,255,0.9);
    }
    .nav-links a:hover {
      color: #FFFFFF;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 24px;
      cursor: pointer;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-button);
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
    }
    .btn-primary:hover {
      background: #E04300;
      transform: scale(1.02);
    }

    .btn-outline {
      border: 2px solid var(--text-light);
      color: var(--text-light);
      background: transparent;
      padding: 10px 26px;
    }
    .btn-outline:hover {
      background: var(--text-light);
      color: var(--primary-deep);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-color: var(--primary-deep);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      width: 100%;
    }

    .hero-content {
      color: white;
    }
    .hero-content h1 {
      font-size: 56px;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.1;
      margin-bottom: 24px;
      color: white;
    }
    .hero-content .highlight {
      color: var(--accent-orange);
    }
    .hero-subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 40px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-visual img {
      width: 100%;
      max-width: 550px;
      border-radius: 20px;
      opacity: 0.9;
      mask-image: radial-gradient(circle, rgba(0,0,0,1) 60%, rgba(0,0,0,0) 100%);
      -webkit-mask-image: radial-gradient(circle, rgba(0,0,0,1) 60%, rgba(0,0,0,0) 100%);
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-heading {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-heading h2 {
      font-size: 40px;
      font-weight: 700;
      letter-spacing: -0.01em;
      margin-bottom: 12px;
      color: var(--text-dark);
    }
    .section-heading .decorator {
      width: 60px;
      height: 4px;
      background: var(--accent-orange);
      margin: 12px auto 0;
      border-radius: 2px;
    }
    .bg-light-gray {
      background-color: var(--bg-light-gray);
    }
    .bg-deep {
      background-color: var(--primary-deep);
      color: white;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .pain-card {
      background: var(--bg-white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .pain-icon {
      font-size: 28px;
      color: var(--danger-red);
    }
    .pain-text h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .pain-text p {
      color: var(--text-mid);
    }

    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    .solution-card {
      background: white;
      padding: 36px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    .solution-icon {
      font-size: 36px;
      color: var(--accent-gold);
      margin-bottom: 20px;
    }
    .solution-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 40px;
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-orange);
      font-family: var(--font-en);
    }
    .stat-label {
      color: rgba(255,255,255,0.8);
      margin-top: 8px;
    }

    /* 证言 */
    .testimonial-carousel {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 40px;
    }
    .testimonial-card {
      background: white;
      padding: 48px;
      border-radius: 24px;
      box-shadow: 0 8px 30px rgba(0,0,0,0.08);
      max-width: 700px;
      text-align: center;
      position: relative;
    }
    .quote-mark {
      font-size: 64px;
      color: var(--accent-gold);
      opacity: 0.4;
      position: absolute;
      top: 20px;
      left: 30px;
    }
    .testimonial-text {
      font-size: 20px;
      font-style: italic;
      margin: 20px 0 24px;
    }
    .stars {
      color: #F4B400;
      margin-bottom: 16px;
    }
    .author {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
    }
    .author img {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      object-fit: cover;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 24px 0;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      text-align: left;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s;
      color: var(--text-mid);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      transition: transform 0.3s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-section {
      background: var(--primary-deep);
      padding: 80px 0;
      text-align: center;
    }
    .cta-section h2 {
      font-size: 40px;
      color: white;
    }
    .cta-sub {
      color: rgba(255,255,255,0.8);
      margin: 20px 0 32px;
    }

    /* 页脚 */
    .footer {
      background: #0A0A0A;
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    .footer-links a {
      display: block;
      color: rgba(255,255,255,0.6);
      margin-bottom: 8px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
    }

    /* 动画 */
    .fade-up {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-visual { order: -1; }
      .pain-grid { grid-template-columns: 1fr 1fr; }
      .solution-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .hero-content h1 { font-size: 36px; }
      .pain-grid, .solution-grid, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }