/* roulang page: index */
:root {
      --deep-space: #0B0E14;
      --stellar-silver: #C0C5CE;
      --aurora-cyan: #00E5A0;
      --gold-accent: #B8963E;
      --card-bg: #141820;
      --card-border: rgba(192, 197, 206, 0.15);
      --text-dim: #8A8F98;
      --white: #FFFFFF;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 12px 40px rgba(0, 229, 160, 0.15);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-full: 50%;
      --transition-smooth: 0.3s ease;
      --container-max: 1280px;
      --space-section: 120px;
      --space-element: 48px;
    }

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

    body {
      background-color: var(--deep-space);
      color: var(--stellar-silver);
      font-family: 'Noto Sans SC', 'Inter', 'Space Grotesk', sans-serif;
      font-weight: 400;
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition-smooth);
      font-weight: 700;
    }

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

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 14, 20, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(192, 197, 206, 0.2);
      z-index: 100;
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: 'Space Grotesk', 'Noto Sans SC', sans-serif;
      font-weight: 800;
      font-size: 1.25rem;
      letter-spacing: 1px;
      display: flex;
      align-items: baseline;
      gap: 4px;
      color: var(--stellar-silver);
      white-space: nowrap;
    }
    .logo .logo-highlight {
      color: var(--aurora-cyan);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      font-weight: 500;
      font-size: 0.95rem;
    }
    .nav-links a {
      color: var(--stellar-silver);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover,
    .nav-links a:focus-visible {
      color: var(--aurora-cyan);
      outline: none;
    }

    .nav-cta-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn-primary-small {
      background: var(--aurora-cyan);
      color: var(--deep-space);
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 0 0 15px rgba(0, 229, 160, 0.3);
      animation: pulse-glow 2s infinite;
    }
    .btn-primary-small:hover {
      background: #1AFFB3;
      box-shadow: 0 0 25px rgba(0, 229, 160, 0.6);
    }

    .badge-limited {
      background: rgba(184, 150, 62, 0.2);
      color: var(--gold-accent);
      font-size: 0.7rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
      letter-spacing: 0.5px;
      border: 1px solid rgba(184, 150, 62, 0.4);
      animation: breathe 2s infinite;
    }

    @keyframes pulse-glow {
      0% { box-shadow: 0 0 10px rgba(0,229,160,0.3); }
      50% { box-shadow: 0 0 20px rgba(0,229,160,0.6); }
      100% { box-shadow: 0 0 10px rgba(0,229,160,0.3); }
    }
    @keyframes breathe {
      0% { opacity: 0.7; }
      50% { opacity: 1; }
      100% { opacity: 0.7; }
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--stellar-silver);
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, rgba(20, 30, 40, 0.6) 0%, var(--deep-space) 75%);
      padding-top: 80px;
    }
    .hero-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 2rem;
    }
    .hero-text {
      max-width: 600px;
    }
    .hero-text h1 {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.1;
      color: var(--white);
      margin-bottom: 1.5rem;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 1.125rem;
      color: var(--stellar-silver);
      margin-bottom: 2.5rem;
      max-width: 500px;
    }
    .btn-primary {
      background: var(--aurora-cyan);
      color: var(--deep-space);
      padding: 16px 36px;
      font-size: 1.1rem;
      border-radius: 8px;
      font-weight: 700;
      box-shadow: 0 0 25px rgba(0,229,160,0.35);
    }
    .btn-primary:hover {
      background: #1AFFB3;
      box-shadow: 0 0 35px rgba(0,229,160,0.6);
    }

    .hero-visual {
      position: relative;
      width: 320px;
      height: 320px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .orbit-ring {
      position: absolute;
      border: 1px solid rgba(192, 197, 206, 0.25);
      border-radius: 50%;
      animation: rotate 20s linear infinite;
    }
    .ring1 { width: 280px; height: 280px; animation-duration: 20s; }
    .ring2 { width: 220px; height: 220px; animation-duration: 25s; animation-direction: reverse; }
    .ring3 { width: 160px; height: 160px; animation-duration: 18s; }
    .center-glow {
      width: 20px;
      height: 20px;
      background: var(--aurora-cyan);
      border-radius: 50%;
      box-shadow: 0 0 50px rgba(0,229,160,0.8);
      position: absolute;
    }
    @keyframes rotate {
      from { transform: rotate(0deg); }
      to { transform: rotate(360deg); }
    }

    /* 通用板块 */
    section {
      padding: var(--space-section) 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 1rem;
      letter-spacing: -0.5px;
    }
    .section-desc {
      color: var(--text-dim);
      max-width: 700px;
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }

    /* 痛点区 */
    .pain-grid {
      display: flex;
      gap: 3rem;
      align-items: center;
    }
    .pain-list {
      flex: 1;
    }
    .pain-item {
      margin-bottom: 2.5rem;
      display: flex;
      gap: 1rem;
    }
    .pain-icon {
      color: var(--aurora-cyan);
      font-size: 1.8rem;
      line-height: 1;
    }
    .pain-title {
      font-weight: 700;
      color: white;
      margin-bottom: 0.3rem;
    }
    .pain-desc {
      color: var(--stellar-silver);
      font-size: 0.9rem;
    }
    .chaos-visual {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .chaos-circle {
      width: 220px;
      height: 220px;
      background: rgba(20,24,32,0.8);
      border-radius: 50%;
      border: 1px solid rgba(192,197,206,0.2);
      position: relative;
      overflow: hidden;
    }
    .particle {
      position: absolute;
      background: var(--aurora-cyan);
      width: 3px;
      height: 3px;
      border-radius: 50%;
      opacity: 0.6;
      animation: float 6s infinite alternate;
    }
    @keyframes float {
      0% { transform: translate(0,0); }
      100% { transform: translate(20px, -20px); opacity: 0.2; }
    }

    /* 解决方案网格 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 1.8rem;
    }
    .solution-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 2rem 1.5rem;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
    }
    .solution-card:hover {
      border-color: var(--aurora-cyan);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }
    .card-icon {
      font-size: 2rem;
      margin-bottom: 1.5rem;
      color: var(--aurora-cyan);
    }
    .card-title {
      font-size: 1.4rem;
      font-weight: 700;
      color: white;
      margin-bottom: 0.8rem;
    }
    .card-desc {
      color: var(--stellar-silver);
      font-size: 0.95rem;
      margin-bottom: 1.5rem;
      flex: 1;
    }
    .card-line {
      height: 2px;
      background: var(--aurora-cyan);
      width: 40px;
      margin-top: auto;
    }

    /* 成果数据 */
    .stats-row {
      display: flex;
      flex-wrap: wrap;
      gap: 2rem;
      align-items: center;
    }
    .stat-item {
      display: flex;
      align-items: baseline;
      gap: 1rem;
    }
    .stat-number {
      font-size: 4rem;
      font-weight: 800;
      color: var(--aurora-cyan);
      line-height: 1;
      font-family: 'Inter', 'Space Grotesk', sans-serif;
    }
    .stat-label {
      color: var(--stellar-silver);
      font-size: 1rem;
    }
    .trajectory-line {
      flex: 1;
      height: 1px;
      background: linear-gradient(to right, var(--aurora-cyan), transparent);
      margin-left: 2rem;
      display: none;
    }
    @media(min-width:768px){ .trajectory-line{ display:block; } }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }
    .testimonial-card {
      background: #1A1F28;
      border-radius: var(--radius-md);
      padding: 2rem;
      border: 1px solid transparent;
      transition: 0.3s;
    }
    .testimonial-card:hover {
      border-color: var(--gold-accent);
    }
    .quote-mark {
      font-size: 3rem;
      color: var(--gold-accent);
      line-height: 1;
      margin-bottom: 0.5rem;
    }
    .quote-text {
      font-style: italic;
      color: var(--stellar-silver);
      margin-bottom: 1.5rem;
    }
    .author-name {
      font-weight: 700;
      color: white;
    }
    .author-role {
      font-size: 0.85rem;
      color: var(--text-dim);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
    }
    .faq-item {
      border-bottom: 1px solid rgba(192,197,206,0.15);
      padding: 1.2rem 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      color: white;
      display: flex;
      align-items: center;
      gap: 1rem;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
    }
    .faq-line {
      width: 3px;
      height: 20px;
      background: var(--aurora-cyan);
      transition: height 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--stellar-silver);
      padding-left: 2rem;
      font-size: 0.95rem;
    }
    .faq-item.active .faq-answer {
      max-height: 120px;
    }
    .faq-item.active .faq-line {
      height: 30px;
    }

    /* 终极CTA */
    .cta-section {
      background: radial-gradient(circle at 20% 30%, #1b222b 0%, #0B0E14 80%);
      text-align: center;
      padding: 100px 0;
      position: relative;
    }
    .cta-title {
      font-size: 2.8rem;
      color: white;
      margin-bottom: 1rem;
    }

    /* 页脚 */
    .site-footer {
      background: var(--deep-space);
      border-top: 1px solid rgba(192,197,206,0.15);
      padding: 3rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
    }
    .footer-col h4 {
      color: white;
      margin-bottom: 1rem;
      font-weight: 700;
    }
    .footer-col a {
      display: block;
      color: var(--stellar-silver);
      font-size: 0.85rem;
      margin-bottom: 0.5rem;
    }
    .social-icons {
      display: flex;
      gap: 1rem;
      margin-top: 2rem;
    }
    .social-circle {
      width: 36px;
      height: 36px;
      border: 1px solid var(--stellar-silver);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--stellar-silver);
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .hero-container { flex-direction: column; text-align: center; }
      .hero-text h1 { font-size: 2.4rem; }
      .pain-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .stats-row { flex-direction: column; align-items: flex-start; }
    }