/* roulang page: index */
:root {
      --color-primary: #1E1E24;
      --color-accent: #FF6B35;
      --color-mint: #2EC4B6;
      --color-bg: #FAFAF8;
      --color-bg-alt: #F0F0EC;
      --color-text: #1E1E24;
      --color-text-secondary: #5C5C66;
      --color-text-muted: #8E8E96;
      --color-white: #FFFFFF;
      --color-border: #E0E0DA;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 50px;
      --shadow-card: 0 4px 24px rgba(30, 30, 36, 0.06);
      --shadow-hover: 0 8px 40px rgba(30, 30, 36, 0.10);
      --shadow-button: 0 6px 20px rgba(255, 107, 53, 0.3);
      --font-title: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "SF Mono", "Menlo", "Monaco", monospace;
      --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.75;
      background-color: var(--color-bg);
      color: var(--color-text);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      transition: var(--transition);
      border: none;
      background: transparent;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 0, 0, 0.06);
      height: 72px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 22px;
      color: var(--color-primary);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.3px;
    }

    .logo span {
      color: var(--color-accent);
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, var(--color-accent), var(--color-mint));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 18px;
    }

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

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

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

    .nav-links a:hover {
      color: var(--color-accent);
    }

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

    .btn-primary {
      background: linear-gradient(135deg, #FF6B35 0%, #FF8C5A 100%);
      color: var(--color-white);
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 15px;
      box-shadow: var(--shadow-button);
      display: inline-block;
      text-align: center;
      letter-spacing: 0.3px;
    }

    .btn-primary:hover {
      background: #E55A2B;
      transform: translateY(-2px);
      box-shadow: 0 10px 28px rgba(255, 107, 53, 0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--color-accent);
      color: var(--color-accent);
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 15px;
      display: inline-block;
    }

    .btn-outline:hover {
      background: var(--color-accent);
      color: white;
      transform: translateY(-2px);
    }

    .btn-text {
      color: var(--color-accent);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      position: relative;
    }

    .btn-text::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-accent);
      transition: width 0.3s;
    }

    .btn-text:hover::after {
      width: 100%;
    }

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

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--color-primary);
      border-radius: 4px;
      transition: var(--transition);
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #1E1E24 0%, #2A2A35 40%, #1E1E24 100%);
      position: relative;
      overflow: hidden;
      padding: 120px 0 80px;
    }

    .hero-glow {
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(255, 107, 53, 0.18) 0%, transparent 70%);
      top: -100px;
      right: -150px;
      border-radius: 50%;
      animation: floatGlow 8s infinite alternate ease-in-out;
    }

    @keyframes floatGlow {
      0% { transform: translate(0, 0) scale(1); }
      100% { transform: translate(-30px, 40px) scale(1.1); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-text {
      color: white;
    }

    .badge {
      background: rgba(46, 196, 182, 0.18);
      color: var(--color-mint);
      padding: 6px 18px;
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 24px;
      border: 1px solid rgba(46, 196, 182, 0.3);
    }

    .hero h1 {
      font-family: var(--font-title);
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
    }

    .hero-subtitle {
      font-size: 20px;
      color: rgba(255, 255, 255, 0.7);
      max-width: 600px;
      margin-bottom: 36px;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      gap: 24px;
      flex-wrap: wrap;
    }

    .hero-stats {
      display: flex;
      gap: 24px;
      margin-top: 48px;
    }

    .stat-badge {
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-md);
      padding: 16px 20px;
      text-align: center;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--color-mint);
    }

    .stat-label {
      font-size: 14px;
      color: rgba(255, 255, 255, 0.6);
    }

    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 50px rgba(0,0,0,0.4);
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-family: var(--font-title);
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 20px;
      line-height: 1.3;
    }

    .section-subtitle {
      color: var(--color-text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }

    .bg-alt {
      background: var(--color-bg-alt);
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 32px;
    }

    .card {
      background: var(--color-white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--color-border);
      transition: var(--transition);
    }

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

    .pain-card {
      border-left: 5px solid var(--color-accent);
    }

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

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
      color: var(--color-text-secondary);
    }

    .check-icon {
      color: var(--color-mint);
      font-weight: 700;
    }

    .data-strip {
      background: var(--color-primary);
      padding: 60px 0;
    }

    .data-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
    }

    .data-item {
      text-align: center;
    }

    .data-num {
      font-family: var(--font-mono);
      font-size: 38px;
      font-weight: 700;
      color: var(--color-mint);
    }

    .data-desc {
      color: rgba(255,255,255,0.7);
    }

    .testimonial-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 28px;
    }

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

    .faq-item {
      border-bottom: 1px solid var(--color-border);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      color: var(--color-text-secondary);
      margin-top: 12px;
      display: none;
    }

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

    .cta-dark {
      background: linear-gradient(135deg, #1E1E24 0%, #FF6B35 200%);
      color: white;
      text-align: center;
      padding: 100px 0;
    }

    .footer {
      background: var(--color-primary);
      color: white;
      padding: 60px 0 30px;
    }

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

    @media (max-width: 1024px) {
      .hero-content {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero h1 {
        font-size: 36px;
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
    }