:root {
      --bg-dark: #0a0e17;
      --bg-card: #111827;
      --primary: #00f0ff;
      --primary-dim: #00b8c9;
      --accent: #7b61ff;
      --text: #e2e8f0;
      --text-muted: #94a3b8;
      --border: rgba(0, 240, 255, 0.15);
      --glow: 0 0 20px rgba(0, 240, 255, 0.3);
    }

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

    body {
      font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      background: var(--bg-dark);
      color: var(--text);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    /* ========== Header ========== */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }

    .nav-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 16px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: 1px;
    }

    nav ul {
      display: flex;
      gap: 32px;
      list-style: none;
    }

    nav a {
      color: var(--text-muted);
      font-size: 0.95rem;
      transition: color 0.3s;
    }

    nav a:hover {
      color: var(--primary);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: all 0.3s;
      border: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #0a0e17;
      box-shadow: var(--glow);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.5);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
    }

    /* ========== Hero ========== */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding: 120px 24px 80px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: -50%;
      left: -20%;
      width: 80%;
      height: 150%;
      background: radial-gradient(circle, rgba(0, 240, 255, 0.08) 0%, transparent 60%);
      pointer-events: none;
    }

    .hero::after {
      content: "";
      position: absolute;
      bottom: -30%;
      right: -10%;
      width: 60%;
      height: 100%;
      background: radial-gradient(circle, rgba(123, 97, 255, 0.08) 0%, transparent 60%);
      pointer-events: none;
    }

    .hero-content {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 1;
    }

    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero-text h1 span {
      background: linear-gradient(90deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-text p {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 520px;
    }

    .hero-cta {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-card {
      width: 100%;
      max-width: 420px;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 32px;
      box-shadow: var(--glow);
      position: relative;
    }

    .hero-card::before {
      content: "";
      position: absolute;
      inset: -1px;
      border-radius: 20px;
      padding: 1px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      pointer-events: none;
    }

    .stat-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 24px;
    }

    .stat-item {
      background: rgba(0, 240, 255, 0.05);
      border-radius: 12px;
      padding: 16px;
      text-align: center;
    }

    .stat-item .num {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
    }

    .stat-item .label {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* ========== Section 通用 ========== */
    section {
      padding: 100px 24px;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
    }

    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-header h2 {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .section-header h2 span {
      color: var(--primary);
    }

    .section-header p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
      font-size: 1.05rem;
    }

    /* ========== 软件特点 ========== */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 32px 28px;
      transition: all 0.3s;
    }

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

    .feature-icon {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(123, 97, 255, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      margin-bottom: 12px;
    }

    .feature-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* ========== 软件优势 ========== */
    .advantages {
      background: linear-gradient(180deg, transparent, rgba(0, 240, 255, 0.03), transparent);
    }

    .adv-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
    }

    .adv-item {
      text-align: center;
      padding: 36px 24px;
      background: var(--bg-card);
      border-radius: 16px;
      border: 1px solid var(--border);
    }

    .adv-item .icon {
      font-size: 2.2rem;
      margin-bottom: 16px;
    }

    .adv-item h3 {
      font-size: 1.2rem;
      margin-bottom: 10px;
      color: var(--primary);
    }

    .adv-item p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* ========== 使用场景 ========== */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 28px;
    }

    .scenario-card {
      background: var(--bg-card);
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid var(--border);
      transition: all 0.3s;
    }

    .scenario-card:hover {
      border-color: var(--accent);
      transform: translateY(-4px);
    }

    .scenario-img {
      height: 160px;
      background: linear-gradient(135deg, rgba(0, 240, 255, 0.1), rgba(123, 97, 255, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 3rem;
    }

    .scenario-body {
      padding: 24px;
    }

    .scenario-body h3 {
      font-size: 1.2rem;
      margin-bottom: 10px;
    }

    .scenario-body p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* ========== FAQ ========== */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 12px;
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 20px 24px;
      background: none;
      border: none;
      color: var(--text);
      font-size: 1.05rem;
      font-weight: 600;
      text-align: left;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }

    .faq-answer-inner {
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
    }

    .faq-item.active .faq-question span {
      transform: rotate(45deg);
    }

    .faq-question span {
      font-size: 1.4rem;
      transition: transform 0.3s;
      color: var(--primary);
    }

    /* ========== Footer ========== */
    footer {
      background: #070b12;
      border-top: 1px solid var(--border);
      padding: 60px 24px 30px;
    }

    .footer-content {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand .logo {
      margin-bottom: 16px;
      display: inline-block;
    }

    .footer-brand p {
      color: var(--text-muted);
      font-size: 0.9rem;
      max-width: 280px;
    }

    .footer-col h4 {
      font-size: 1rem;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col li {
      margin-bottom: 10px;
    }

    .footer-col a {
      color: var(--text-muted);
      font-size: 0.9rem;
      transition: color 0.3s;
    }

    .footer-col a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      max-width: 1200px;
      margin: 0 auto;
      padding-top: 24px;
      border-top: 1px solid var(--border);
      text-align: center;
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    /* ========== 响应式 ========== */
    @media (max-width: 900px) {
      .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-text p {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-cta {
        justify-content: center;
      }
      .hero-text h1 {
        font-size: 2.4rem;
      }
      nav ul {
        display: none;
      }
      .footer-content {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 600px) {
      .hero-text h1 {
        font-size: 1.9rem;
      }
      .section-header h2 {
        font-size: 1.8rem;
      }
      .footer-content {
        grid-template-columns: 1fr;
      }
    }