/* roulang page: index */
:root {
      --primary-start: #7B2FF7;
      --primary-end: #00F5D4;
      --accent-gold: #FFB800;
      --deep-blue: #0B0E1A;
      --card-bg: #1E1E2A;
      --cloud-white: #F8F9FC;
      --text-primary: #1E1E2A;
      --text-secondary: #A0A3B1;
      --gradient-primary: linear-gradient(135deg, #7B2FF7 0%, #00F5D4 100%);
      --gradient-gold: radial-gradient(circle at 30% 30%, #FFD700, #FF8C00);
      --card-shadow: 0 4px 24px rgba(123,47,247,0.08);
      --card-hover-shadow: 0 12px 40px rgba(123,47,247,0.18);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --space-section: 100px;
      --space-card-padding: 32px;
      --header-height: 72px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      background-color: var(--cloud-white);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: opacity 0.2s;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.2s ease;
      border: none;
      outline: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo i {
      font-size: 1.8rem;
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .desktop-nav a {
      font-weight: 500;
      font-size: 0.95rem;
      color: #2D2D3A;
      position: relative;
      padding: 4px 0;
    }
    .desktop-nav a:hover, .desktop-nav a.active {
      color: #7B2FF7;
    }
    .desktop-nav a::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--gradient-primary);
      transition: width 0.2s;
    }
    .desktop-nav a:hover::after, .desktop-nav a.active::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--gradient-primary);
      color: white;
      font-weight: 600;
      padding: 10px 28px;
      border-radius: var(--radius-pill);
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      box-shadow: 0 6px 20px rgba(123,47,247,0.3);
      transition: all 0.25s;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      transform: scale(1.03);
      box-shadow: 0 10px 28px rgba(123,47,247,0.4);
    }
    .btn-outline {
      background: transparent;
      color: #7B2FF7;
      font-weight: 600;
      padding: 10px 28px;
      border-radius: var(--radius-pill);
      font-size: 0.95rem;
      border: 1.5px solid #7B2FF7;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: rgba(123,47,247,0.06);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: #2D2D3A;
      background: none;
      border: none;
      cursor: pointer;
    }
    .mobile-drawer {
      position: fixed;
      top: 0;
      right: 0;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: white;
      box-shadow: -8px 0 30px rgba(0,0,0,0.15);
      transform: translateX(100%);
      transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      z-index: 100;
      display: flex;
      flex-direction: column;
      padding: 28px 20px;
    }
    .mobile-drawer.open {
      transform: translateX(0);
    }
    .drawer-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.5);
      z-index: 90;
      display: none;
    }
    .drawer-overlay.show {
      display: block;
    }
    .mobile-drawer a {
      padding: 14px 0;
      font-weight: 600;
      border-bottom: 1px solid #f0f0f0;
      color: #1E1E2A;
    }
    /* Hero */
    .hero-section {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: var(--deep-blue);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-particles {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(123,47,247,0.18) 0%, transparent 50%),
                  radial-gradient(circle at 80% 70%, rgba(0,245,212,0.12) 0%, transparent 50%);
      animation: pulse 8s infinite alternate;
    }
    @keyframes pulse {
      0% { opacity: 0.5; }
      100% { opacity: 0.9; }
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 800;
      background: linear-gradient(to right, #ffffff, #E0E7FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.3;
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #B0B8D0;
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .floating-cards {
      position: relative;
      width: 100%;
      height: 460px;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .float-card {
      position: absolute;
      width: 200px;
      height: 280px;
      background: rgba(30,30,42,0.8);
      backdrop-filter: blur(12px);
      border-radius: 28px;
      background-size: cover;
      background-position: center;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.1);
      transition: transform 0.3s;
    }
    .float-card:nth-child(1) { top: 10px; left: 20px; transform: rotate(-6deg); background-image: url('/assets/images/backpic/back-1.webp'); }
    .float-card:nth-child(2) { top: 60px; right: 20px; transform: rotate(4deg); background-image: url('/assets/images/backpic/back-2.webp'); }
    .float-card:nth-child(3) { bottom: 10px; left: 40px; transform: rotate(-2deg); background-image: url('/assets/images/backpic/back-3.webp'); }
    /* 通用板块 */
    .section {
      padding: var(--space-section) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 2.4rem;
      font-weight: 700;
      color: #0B0E1A;
    }
    .grid-2, .grid-3, .grid-4 {
      display: grid;
      gap: 32px;
    }
    .grid-2 { grid-template-columns: repeat(2,1fr); }
    .grid-3 { grid-template-columns: repeat(3,1fr); }
    .grid-4 { grid-template-columns: repeat(4,1fr); }
    .card {
      background: white;
      border-radius: var(--radius-lg);
      padding: var(--space-card-padding);
      box-shadow: var(--card-shadow);
      transition: all 0.25s;
      border: 1px solid transparent;
    }
    .card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
      border-image: linear-gradient(135deg, #7B2FF7, #00F5D4) 1;
    }
    .dark-card {
      background: var(--card-bg);
      color: white;
    }
    .badge-gold {
      background: var(--gradient-gold);
      color: #0B0E1A;
      font-weight: 800;
      padding: 6px 18px;
      border-radius: 40px;
      font-size: 0.9rem;
      display: inline-block;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .floating-cards { height: 320px; }
      .grid-3 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .hamburger { display: block; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero-text h1 { font-size: 2.2rem; }
      .section-title h2 { font-size: 1.8rem; }
      .floating-cards { height: 280px; }
      .float-card { width: 140px; height: 200px; }
    }