/* roulang page: index */
:root {
      --primary: #FF5E1A;
      --primary-dark: #E04A10;
      --secondary: #1A0A2E;
      --accent: #00F0FF;
      --bg: #0D0D0D;
      --card-bg: #15151F;
      --text: #B0B0C0;
      --text-white: #FFFFFF;
      --border-subtle: rgba(255,255,255,0.06);
      --radius-card: 12px;
      --radius-inner: 8px;
      --radius-pill: 50px;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
      --shadow-hover: 0 8px 40px rgba(255,94,26,0.25);
      --transition-smooth: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
      --font-body: 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--bg);
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-weight: 300;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s;
    }
    .navbar.scrolled {
      background: rgba(13,13,13,0.93);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 900;
      font-size: 1.5rem;
      color: var(--text-white);
      letter-spacing: 1px;
      z-index: 1001;
    }
    .logo svg {
      width: 32px;
      height: 32px;
    }
    .nav-menu {
      display: flex;
      gap: 2rem;
      list-style: none;
      align-items: center;
    }
    .nav-menu a {
      color: #ccc;
      font-weight: 400;
      font-size: 0.95rem;
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--accent);
    }
    .nav-cta {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-size: 0.9rem;
      margin-left: 1.5rem;
      transition: background 0.25s, box-shadow 0.25s;
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 20px rgba(255,94,26,0.6);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: center;
      gap: 6px;
      z-index: 1001;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      transition: 0.3s;
      display: block;
    }
    .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10,10,20,0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        padding: 0;
        margin: 0;
      }
      .nav-menu.active {
        transform: translateX(0);
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        margin-left: 0;
      }
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: radial-gradient(circle at 30% 40%, #1A0A2E, #0D0D0D 80%);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      text-align: center;
    }
    #particle-canvas {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      padding: 0 20px;
    }
    .hero h1 {
      font-family: var(--font-body);
      font-weight: 900;
      font-size: 3.5rem;
      letter-spacing: -0.02em;
      background: linear-gradient(135deg, #FF5E1A, #FF8A50);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
      animation: fadeUp 0.8s ease-out;
    }
    .hero-sub {
      font-size: 1.15rem;
      color: #B0B0C0;
      letter-spacing: 0.05em;
      margin-bottom: 2.5rem;
      font-weight: 300;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-size: 1rem;
      transition: background 0.25s, box-shadow 0.25s;
      box-shadow: 0 4px 15px rgba(255,94,26,0.4);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 24px rgba(255,94,26,0.8);
      animation: pulse 2s infinite;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-size: 1rem;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      border-color: #fff;
      color: #fff;
      box-shadow: 0 0 18px rgba(0,240,255,0.5);
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,94,26,0.7); }
      70% { box-shadow: 0 0 0 12px rgba(255,94,26,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,94,26,0); }
    }
    @keyframes fadeUp {
      0% { opacity: 0; transform: translateY(30px); }
      100% { opacity: 1; transform: translateY(0); }
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section {
        padding: 70px 0;
      }
      .hero h1 {
        font-size: 2.2rem;
      }
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: white;
      margin-bottom: 48px;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .section-title::before {
      content: '';
      width: 4px;
      height: 32px;
      background: var(--accent);
      display: inline-block;
      border-radius: 2px;
    }

    /* 核心优势 非对称 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 32px;
    }
    .advantage-wide {
      background: #1A1A28;
      border-left: 6px solid var(--accent);
      border-radius: var(--radius-card);
      padding: 40px;
    }
    .advantage-small {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-subtle);
    }
    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据数字 */
    .stats-container {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 30px;
      text-align: center;
    }
    .stat-item .number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 3rem;
      color: var(--accent);
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-subtle);
      transition: var(--transition-smooth);
    }
    .service-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,240,255,0.4);
      box-shadow: var(--shadow-hover);
    }
    @media (max-width: 1024px) { .services-grid { grid-template-columns: repeat(2,1fr); } }
    @media (max-width: 640px) { .services-grid { grid-template-columns: 1fr; } }

    /* 战队滑动 */
    .team-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
      -webkit-overflow-scrolling: touch;
    }
    .team-scroll::-webkit-scrollbar { display: none; }
    .team-card {
      min-width: 260px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      scroll-snap-align: start;
      padding: 20px;
      border: 1px solid var(--border-subtle);
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) { .faq-grid { grid-template-columns: 1fr; } }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; } }