/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --accent: #00E5FF;
      --bg-deep: #0A0A0F;
      --bg-card: #14141F;
      --text-white: #FFFFFF;
      --text-muted: #B0B0C0;
      --text-highlight: #C5B0F0;
      --border-subtle: rgba(123, 47, 247, 0.15);
      --shadow-card: 0 0 0 1px rgba(123,47,247,0.08), 0 4px 24px rgba(0,0,0,0.4);
      --shadow-glow: 0 8px 32px rgba(123, 47, 247, 0.4);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 4px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition-smooth: 0.3s ease-out;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-muted);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 10, 15, 0.75);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s;
    }
    .nav.scrolled {
      background: rgba(10, 10, 15, 0.95);
      border-bottom: 1px solid var(--border-subtle);
      backdrop-filter: blur(20px);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--text-white);
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--text-white);
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .nav-cta:hover {
      transform: scale(1.03);
      box-shadow: 0 0 20px rgba(123, 47, 247, 0.6);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-white);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: var(--bg-deep);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 999;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      color: var(--text-white);
      font-size: 1.5rem;
      text-decoration: none;
    }

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

    h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--text-white);
    }
    h2 {
      font-size: 34px;
      font-weight: 600;
      line-height: 1.3;
      color: var(--text-white);
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      font-weight: 500;
      color: var(--text-white);
    }
    p {
      max-width: 680px;
      margin-bottom: 24px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: var(--transition-smooth);
      border: none;
      cursor: pointer;
      font-size: 1rem;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white;
      box-shadow: 0 4px 14px rgba(123,47,247,0.35);
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 8px 28px rgba(0,229,255,0.45);
      background: linear-gradient(160deg, var(--primary), var(--accent));
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
    }
    .btn-secondary:hover {
      background: rgba(0,229,255,0.08);
      border-color: var(--primary);
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(10,10,15,0.75);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-graphic {
      width: 100%;
      height: 360px;
      background: radial-gradient(circle at 30% 30%, rgba(123,47,247,0.3), transparent 70%);
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      border: 1px solid var(--border-subtle);
    }
    .hero-graphic::after {
      content: "";
      position: absolute;
      inset: 0;
      background: repeating-linear-gradient(45deg, rgba(0,229,255,0.08) 0px, rgba(0,229,255,0.08) 2px, transparent 2px, transparent 8px);
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .pain-card {
      background: var(--bg-card);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
    }
    .pain-icon {
      font-size: 2rem;
      margin-bottom: 16px;
      color: var(--accent);
    }

    /* 解决方案 纵向路径 */
    .solution-row {
      display: flex;
      gap: 64px;
      margin-top: 48px;
    }
    .solution-title {
      flex: 1;
    }
    .solution-steps {
      flex: 2;
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .step-item {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }
    .step-num {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1;
      min-width: 60px;
    }

    /* 成果数字 */
    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .stat-card {
      background: var(--bg-card);
      padding: 32px 16px;
      border-radius: var(--radius-card);
      text-align: center;
      border: 1px solid var(--border-subtle);
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      font-feature-settings: "tnum";
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .testimonial-card {
      background: var(--bg-card);
      padding: 28px;
      border-radius: var(--radius-card);
      border-left: 4px solid var(--primary);
      box-shadow: var(--shadow-card);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 24px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-white);
      font-size: 1.2rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }

    /* CTA 区域 */
    .cta-section {
      background: radial-gradient(circle at 30% 40%, rgba(123,47,247,0.2), transparent 70%);
      text-align: center;
      padding: 120px 0;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-subtle);
      padding: 24px 0;
      text-align: center;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .pain-grid { grid-template-columns: repeat(2, 1fr); }
      .results-grid { grid-template-columns: repeat(2, 1fr); }
      .solution-row { flex-direction: column; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-right { display: none; }
      h1 { font-size: 34px; }
      h2 { font-size: 26px; }
      .pain-grid, .results-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .btn { width: 100%; }
    }