/* roulang page: index */
:root {
      --primary-neon: #00E676;
      --primary-dark: #00C853;
      --accent-pink: #FF1744;
      --bg-deep-purple: #1A0A2E;
      --bg-dark: #0B0418;
      --glass-bg: rgba(10, 5, 20, 0.75);
      --glass-border: rgba(0, 230, 118, 0.25);
      --text-white: #FFFFFF;
      --text-light: rgba(255, 255, 255, 0.8);
      --text-muted: rgba(255, 255, 255, 0.55);
      --border-radius-card: 20px;
      --border-radius-btn: 50px;
      --shadow-glow: 0 0 25px rgba(0, 230, 118, 0.5);
      --shadow-card: 0 12px 36px rgba(0, 0, 0, 0.6);
      --transition: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-mono: 'JetBrains Mono', 'Courier New', monospace;
      --container-max: 1280px;
      --section-gap: 90px;
      --nav-height: 76px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-dark);
    }

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 30% 10%, #2D1B4E 0%, #0B0418 75%);
      color: var(--text-white);
      line-height: 1.5;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 28px;
      width: 100%;
    }

    /* 粒子背景 canvas 占位 */
    #particle-canvas {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 0;
      pointer-events: none;
      opacity: 0.35;
    }

    /* 导航栏 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(10, 4, 25, 0.8);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(0, 230, 118, 0.18);
      height: var(--nav-height);
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 28px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--primary-neon);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      line-height: 1;
    }
    .logo i {
      font-size: 2rem;
      color: var(--primary-neon);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary-neon);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary-neon);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary-neon);
      color: #0B0418;
      font-weight: 700;
      padding: 10px 26px;
      border-radius: var(--border-radius-btn);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(0, 230, 118, 0.35);
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background: #00ff84;
      box-shadow: 0 0 28px #00E676;
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-neon);
      color: var(--primary-neon);
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--border-radius-btn);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary-neon);
      color: #0B0418;
      box-shadow: 0 0 20px #00E676;
    }

    .mobile-bottom-nav {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      z-index: 2;
      padding-top: var(--nav-height);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    .hero h1 {
      font-size: 3.8rem;
      font-weight: 900;
      line-height: 1.15;
      color: white;
      margin-bottom: 1.5rem;
      background: linear-gradient(to right, #00E676, #AEEA00);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2.2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      height: 420px;
      box-shadow: 0 20px 50px rgba(0,230,118,0.15);
      border: 1px solid rgba(0,230,118,0.25);
    }

    /* 通用区块 */
    section {
      padding: var(--section-gap) 0;
      position: relative;
      z-index: 2;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary-neon);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 650px;
      margin: 0 auto 50px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .card {
      background: var(--glass-bg);
      backdrop-filter: blur(8px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-card);
      padding: 32px 24px;
      transition: var(--transition);
      box-shadow: var(--shadow-card);
    }
    .card:hover {
      border-color: var(--primary-neon);
      transform: translateY(-6px);
      box-shadow: 0 20px 40px rgba(0,230,118,0.2);
    }
    .card i {
      font-size: 2.2rem;
      color: var(--primary-neon);
      margin-bottom: 18px;
    }
    .card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
      font-weight: 700;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 25px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.9rem;
      font-weight: 700;
      color: var(--primary-neon);
    }

    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 15px;
      scrollbar-width: thin;
    }
    .case-card {
      min-width: 300px;
      background: var(--glass-bg);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid var(--glass-border);
    }
    .case-card img {
      width: 100%;
      height: 160px;
      object-fit: cover;
    }

    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
    }
    .step-circle {
      width: 70px;
      height: 70px;
      border: 2px solid var(--primary-neon);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      font-weight: 700;
      margin: 0 auto 15px;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.15);
    }
    .faq-question {
      font-weight: 700;
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .cta-banner {
      background: linear-gradient(135deg, #1A0A2E 0%, #0B0418 100%);
      border-radius: 32px;
      padding: 70px 40px;
      text-align: center;
      border: 1px solid var(--primary-neon);
    }

    footer {
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.1);
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10,4,25,0.9);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 12px 8px;
        z-index: 99;
        border-top: 1px solid #00E67640;
      }
      .hero-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.5rem; }
      .grid-3, .stats-grid { grid-template-columns: 1fr; }
      .steps { flex-direction: column; gap: 30px; }
    }