/* roulang page: index */
:root {
      --primary: #7B2FFF;
      --primary-hover: #9355FF;
      --primary-glow: rgba(123, 47, 255, 0.25);
      --accent: #FF6B35;
      --accent-hover: #FF8055;
      --success: #00E5A0;
      --warning: #FFB800;
      --bg-global: #0A0A0F;
      --bg-card: #14141F;
      --bg-section: #0F0F17;
      --bg-hero-center: #1A1030;
      --text-primary: #FFFFFF;
      --text-secondary: #8A8A9A;
      --text-muted: #5A5A6E;
      --border-light: rgba(123, 47, 255, 0.15);
      --border-hover: rgba(123, 47, 255, 0.4);
      --shadow-card: 0 8px 32px rgba(123, 47, 255, 0.12);
      --shadow-hover: 0 16px 40px rgba(123, 47, 255, 0.25);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 50px;
      --font-h1: 2.6rem;
      --font-h2: 2rem;
      --font-h3: 1.35rem;
      --font-body: 1rem;
      --font-small: 0.875rem;
      --transition: 0.25s ease-out;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-global);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: var(--font-body);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 600;
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.4rem;
      white-space: nowrap;
      transition: all var(--transition);
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(20px);
      background: rgba(10, 10, 15, 0.85);
      border-bottom: 1px solid var(--border-light);
      transition: background 0.3s;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), #b388ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-menu {
      display: flex;
      gap: 1.8rem;
      list-style: none;
    }
    .nav-menu a {
      color: var(--text-secondary);
      font-weight: 500;
      position: relative;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: #fff;
    }
    .nav-menu a:hover::after, .nav-menu a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary);
      color: #fff;
      padding: 0.6rem 1.6rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      box-shadow: 0 0 16px var(--primary-glow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: #fff;
      border-radius: 2px;
      transition: 0.2s;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, var(--bg-hero-center), var(--bg-global) 80%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(123,47,255,0.12) 0%, transparent 70%);
      top: -100px;
      right: -100px;
      border-radius: 50%;
      animation: float 6s infinite alternate;
    }
    @keyframes float {
      0% { transform: translate(0, 0); }
      100% { transform: translate(30px, -30px); }
    }
    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      gap: 3rem;
    }
    .hero-text h1 {
      font-size: var(--font-h1);
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 1.2rem;
    }
    .hero-text p {
      color: var(--text-secondary);
      font-size: var(--font-body);
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      height: 52px;
      padding: 0 2rem;
      border-radius: var(--radius-btn);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 8px 24px var(--primary-glow);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: #fff;
      height: 52px;
      padding: 0 2rem;
      border-radius: var(--radius-btn);
    }
    .btn-outline:hover {
      background: rgba(123,47,255,0.1);
    }
    .hero-visual {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .hero-visual img {
      width: 100%;
      border-radius: var(--radius-lg);
    }
    .hero-scroll {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      color: var(--text-secondary);
      font-size: 1.8rem;
    }
    @keyframes bounce {
      0%, 100% { transform: translate(-50%, 0); }
      50% { transform: translate(-50%, 10px); }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: var(--font-h2);
      font-weight: 700;
      text-align: center;
      margin-bottom: 1rem;
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto 3rem;
      font-size: var(--font-body);
    }

    /* 卡片网格 */
    .grid-4, .grid-3 {
      display: grid;
      gap: 24px;
    }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all var(--transition);
      box-shadow: var(--shadow-card);
    }
    .card:hover {
      border-color: var(--border-hover);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .card-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 1rem;
      transition: transform var(--transition);
    }
    .card:hover .card-icon {
      transform: scale(1.1);
    }
    .card h3 {
      font-size: var(--font-h3);
      margin-bottom: 0.5rem;
    }
    .card p {
      color: var(--text-secondary);
      font-size: var(--font-small);
    }

    /* 功能交替区块 */
    .capability-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
      margin-bottom: 4rem;
    }
    .capability-row.reverse {
      direction: rtl;
    }
    .capability-row.reverse .capability-content {
      direction: ltr;
    }
    .capability-content h3 {
      font-size: var(--font-h3);
      margin-bottom: 1rem;
    }
    .capability-content ul {
      list-style: none;
      margin-top: 1rem;
    }
    .capability-content li {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--text-secondary);
      margin-bottom: 0.4rem;
    }
    .capability-content li::before {
      content: '✓';
      color: var(--success);
      font-weight: bold;
    }
    .capability-img {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .capability-img img {
      width: 100%;
      height: auto;
    }

    /* 场景卡片 */
    .scenario-card {
      background: #1A1A2E;
      border: 1px solid var(--border-light);
    }
    .scenario-tag {
      display: inline-block;
      background: rgba(255,107,53,0.15);
      color: var(--accent);
      font-size: 0.75rem;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      margin-top: 1rem;
    }

    /* 案例数字 */
    .case-metric {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--accent);
      margin: 0.5rem 0;
    }

    /* 价格 */
    .pricing-card {
      position: relative;
      text-align: center;
    }
    .pricing-card.featured {
      border: 2px solid var(--accent);
      box-shadow: 0 0 24px rgba(255,107,53,0.25);
    }
    .pricing-badge {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent);
      color: #fff;
      font-size: 0.75rem;
      padding: 0.25rem 1rem;
      border-radius: 20px;
    }
    .price {
      font-size: 2.5rem;
      font-weight: 700;
      margin: 1rem 0;
    }
    .pricing-features {
      list-style: none;
      text-align: left;
      margin: 1.5rem 0;
      color: var(--text-secondary);
    }
    .pricing-features li::before {
      content: '✓';
      color: var(--success);
      margin-right: 0.5rem;
    }
    .btn-accent {
      background: var(--accent);
      color: #fff;
      height: 48px;
      padding: 0 2rem;
      border-radius: var(--radius-btn);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      box-shadow: 0 8px 20px rgba(255,107,53,0.3);
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      padding: 0 24px;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      color: #fff;
      font-weight: 600;
      font-size: var(--font-body);
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s;
      color: var(--text-secondary);
      font-size: var(--font-small);
      padding: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      transition: transform 0.3s;
      font-size: 1.2rem;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(180deg, #1A1030 0%, #0A0A0F 100%);
      text-align: center;
      padding: 100px 0;
    }

    /* 页脚 */
    .footer {
      background: #08080D;
      padding: 60px 0 30px;
      color: var(--text-secondary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    .footer a {
      color: var(--text-secondary);
      font-size: var(--font-small);
    }
    .footer a:hover {
      color: #fff;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-light);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: var(--font-small);
    }

    /* 移动端 */
    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .hero .container { grid-template-columns: 1fr; text-align: center; }
      .hero-visual { max-width: 400px; margin: 0 auto; }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .capability-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      :root {
        --font-h1: 2rem;
        --font-h2: 1.6rem;
        --font-h3: 1.2rem;
      }
      .nav-menu { display: none; }
      .nav-cta { display: none; }
      .hamburger { display: flex; }
      .grid-4, .grid-3 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 60px 0; }
    }