/* roulang page: index */
:root {
      --bg-deep: #0B0D12;
      --bg-card: #13161C;
      --bg-elevated: #1A1E26;
      --signal-green: #00E676;
      --signal-green-hover: #1BFF8B;
      --electric-blue: #0077FF;
      --warm-gold: #F5A623;
      --text-primary: #F0F2F5;
      --text-secondary: #8A8F9A;
      --text-disabled: #4A4F58;
      --border-subtle: rgba(255,255,255,0.06);
      --border-light: rgba(255,255,255,0.1);
      --shadow-green: 0 0 24px rgba(0,230,118,0.5);
      --shadow-green-soft: 0 8px 32px rgba(0,230,118,0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --transition: all 0.25s ease;
      --container-max: 1280px;
      --font-sans: "Inter", "SF Pro Display", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "JetBrains Mono", "Fira Code", monospace;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

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

    /* 顶部信息条 */
    .top-bar {
      background: #0A0C10;
      height: 36px;
      display: flex;
      align-items: center;
      font-size: 12px;
      color: var(--text-secondary);
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
    }
    .top-bar a {
      color: var(--text-secondary);
    }
    .top-bar a:hover {
      color: var(--signal-green);
    }

    /* 主导航 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(11, 13, 18, 0.8);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--text-primary);
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--signal-green);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M2 12h3l3-8 4 16 4-8h3"/></svg>') center/contain no-repeat;
      background-color: var(--signal-green);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 0.95rem;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--signal-green);
    }
    .btn-primary-sm {
      background: var(--signal-green);
      color: #0B0D12;
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
    }
    .btn-primary-sm:hover {
      background: var(--signal-green-hover);
      box-shadow: var(--shadow-green);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(11,13,18,0.98);
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
      backdrop-filter: blur(16px);
      z-index: 99;
    }
    .mobile-menu a {
      font-size: 1.5rem;
      color: var(--text-primary);
      border-bottom: 1px solid var(--border-subtle);
      padding-bottom: 12px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1a2a1f 0%, var(--bg-deep) 70%);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-wave {
      position: absolute;
      right: 0;
      bottom: 0;
      width: 60%;
      opacity: 0.15;
      pointer-events: none;
    }
    .hero-content {
      max-width: 700px;
      position: relative;
      z-index: 2;
    }
    .hero h1 {
      font-size: clamp(2.5rem, 6vw, 4rem);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--signal-green);
      color: #0B0D12;
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--signal-green-hover);
      box-shadow: var(--shadow-green);
    }
    .btn-outline {
      border: 1px solid var(--signal-green);
      color: var(--signal-green);
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 700;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.08);
    }
    .live-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(0,230,118,0.1);
      padding: 6px 16px;
      border-radius: 20px;
      margin-top: 24px;
      color: var(--signal-green);
      font-weight: 600;
      font-size: 0.9rem;
    }
    .pulse-dot {
      width: 10px;
      height: 10px;
      background: var(--signal-green);
      border-radius: 50%;
      box-shadow: 0 0 12px var(--signal-green);
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse { 0% { opacity: 1; transform: scale(1); } 50% { opacity: 0.6; transform: scale(1.3); } 100% { opacity: 1; transform: scale(1); } }

    /* sections */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
      color: var(--text-primary);
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      transition: var(--transition);
    }
    .adv-card:hover {
      border-color: rgba(0,230,118,0.4);
      box-shadow: var(--shadow-green-soft);
    }
    .adv-icon {
      font-size: 2.2rem;
      color: var(--signal-green);
      margin-bottom: 16px;
    }

    /* 产品生态 */
    .eco-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .eco-block {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 32px;
      border-left: 4px solid var(--signal-green);
    }
    .eco-list {
      list-style: none;
      margin-top: 16px;
    }
    .eco-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 12px;
      color: var(--text-secondary);
    }
    .eco-list li::before {
      content: "•";
      color: var(--signal-green);
      font-weight: bold;
    }

    /* 场景卡片 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scene-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      transition: var(--transition);
    }
    .scene-card:hover {
      transform: translateY(-6px);
      border-color: var(--signal-green);
    }
    .scene-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .scene-body {
      padding: 20px;
    }

    /* 成功案例 */
    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--warm-gold);
    }
    .case-cards {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--bg-elevated);
      padding: 24px;
      border-radius: var(--radius-md);
    }

    /* FAQ */
    .faq-item {
      background: var(--bg-card);
      border: 1px solid transparent;
      margin-bottom: 12px;
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active {
      border-color: rgba(0,230,118,0.5);
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: var(--bg-elevated);
      text-align: center;
      padding: 80px 24px;
      border-radius: var(--radius-lg);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-subtle);
      margin-top: 40px;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      color: var(--text-secondary);
    }

    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .scenarios-grid { grid-template-columns: 1fr 1fr; }
      .case-cards { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
      .eco-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .advantages-grid, .scenarios-grid, .case-cards { grid-template-columns: 1fr; }
      .hero-buttons .btn { width: 100%; }
    }