/* roulang page: index */
:root {
      --deep-space: #1E0A3C;
      --cosmic-dark: #0D0221;
      --aurora-green: #00E5A0;
      --nebula-gold: #FFB347;
      --white: #FFFFFF;
      --light-bg: #F8F9FC;
      --text-dark: #1A1A2E;
      --text-mid: #4A4A6A;
      --text-light: #B8C5D6;
      --card-bg-dark: rgba(255,255,255,0.04);
      --border-aurora: 1px solid var(--aurora-green);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.08);
      --shadow-hover: 0 8px 32px rgba(0,229,160,0.12);
      --transition: 0.3s ease;
      --container-max: 1280px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      background-color: var(--light-bg);
      color: var(--text-dark);
      line-height: 1.6;
      scroll-behavior: smooth;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 700;
    }
    h1 {
      font-size: 48px;
      line-height: 56px;
      color: var(--white);
    }
    h2 {
      font-size: 36px;
      line-height: 44px;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    h3 {
      font-size: 24px;
      line-height: 32px;
    }
    h4 {
      font-size: 18px;
      line-height: 26px;
    }
    p {
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-mid);
      margin-bottom: 12px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: 'Noto Sans SC', sans-serif;
      font-weight: 700;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
    }
    /* 导航 */
    #nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(30,10,60,0.85);
      backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s;
    }
    #nav.scrolled {
      background: var(--deep-space);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--white);
      font-weight: 700;
      font-size: 22px;
      letter-spacing: 1px;
    }
    .logo i {
      color: var(--aurora-green);
      font-size: 28px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 8px 0;
      transition: color 0.3s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--aurora-green);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--aurora-green);
    }
    .nav-cta {
      background: var(--aurora-green);
      color: var(--deep-space);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: 0.3s;
      white-space: nowrap;
    }
    .nav-cta:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 16px rgba(0,229,160,0.5);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 28px;
    }
    /* 底部移动导航 */
    .mobile-bottom-nav {
      display: none;
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #1E0A3C 0%, #0D0221 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
    }
    .stars-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      margin-bottom: 24px;
      font-size: 48px;
    }
    .hero-content .highlight {
      color: var(--aurora-green);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--aurora-green);
      color: var(--deep-space);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-size: 18px;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 20px rgba(0,229,160,0.6);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--aurora-green);
      color: var(--aurora-green);
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-size: 18px;
    }
    .btn-secondary:hover {
      background: rgba(0,229,160,0.1);
      border-color: var(--nebula-gold);
      color: var(--nebula-gold);
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin-top: 48px;
      flex-wrap: wrap;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 32px;
      color: var(--aurora-green);
    }
    .stat-label {
      color: var(--text-light);
      font-size: 14px;
    }
    .hero-image img {
      width: 100%;
      filter: drop-shadow(0 0 30px rgba(0,229,160,0.3));
      animation: float 6s ease-in-out infinite;
    }
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-15px); }
      100% { transform: translateY(0px); }
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-header h2 {
      color: var(--text-dark);
    }
    .section-header p {
      color: var(--text-mid);
      max-width: 700px;
      margin: 0 auto;
      font-size: 18px;
    }
    /* 痛点 */
    #pain-points {
      background: var(--light-bg);
    }
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--aurora-green);
      transition: var(--transition);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .pain-icon {
      font-size: 32px;
      color: var(--aurora-green);
      margin-bottom: 16px;
    }
    /* 解决方案 */
    #solution {
      background: var(--white);
    }
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      border-color: var(--aurora-green);
      box-shadow: var(--shadow-hover);
    }
    .solution-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .solution-card:hover img {
      transform: scale(1.03);
    }
    .solution-body {
      padding: 24px;
    }
    .solution-body ul {
      list-style: none;
      margin: 16px 0;
    }
    .solution-body li {
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-mid);
    }
    .solution-body li i {
      color: var(--aurora-green);
    }
    .text-link {
      color: var(--aurora-green);
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .text-link:hover {
      text-decoration: underline;
    }
    /* 成果 */
    #results {
      background: var(--deep-space);
      color: var(--white);
    }
    #results h2, #results .stat-label {
      color: var(--white);
    }
    .results-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .metrics {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .metric-value {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 48px;
      color: var(--aurora-green);
    }
    .case-card {
      background: rgba(255,255,255,0.05);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid rgba(255,255,255,0.1);
    }
    /* 证言 */
    #testimonials {
      background: var(--light-bg);
    }
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .testimonial-card {
      min-width: 300px;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .testimonial-header img {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      object-fit: cover;
    }
    .stars i {
      color: var(--aurora-green);
    }
    /* FAQ */
    #faq {
      background: var(--white);
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(0,229,160,0.2);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-mid);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    #cta {
      background: linear-gradient(135deg, #1E0A3C, #0D0221);
      text-align: center;
      color: var(--white);
    }
    .cta-button {
      background: var(--nebula-gold);
      color: var(--deep-space);
      padding: 18px 48px;
      font-size: 20px;
      border-radius: var(--radius-btn);
      margin-top: 24px;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,179,71,0.6); }
      70% { box-shadow: 0 0 0 15px rgba(255,179,71,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,179,71,0); }
    }
    /* 页脚 */
    #footer {
      background: #0D0221;
      color: var(--text-light);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }
    @media (max-width: 1024px) {
      h1 { font-size: 36px; line-height: 44px; }
      .hero-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-cta { display: none; }
      .mobile-toggle { display: block; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: var(--deep-space);
        justify-content: space-around;
        padding: 12px 0;
        z-index: 999;
        border-top: 1px solid rgba(255,255,255,0.1);
      }
      .pain-grid, .solution-grid, .metrics, .footer-grid {
        grid-template-columns: 1fr;
      }
      .results-grid {
        grid-template-columns: 1fr;
      }
      .hero-stats { justify-content: center; }
    }