/* roulang page: index */
:root {
      --primary-bg: #0B0C1E;
      --bg-deeper: #080A1A;
      --bg-card: rgba(255, 255, 255, 0.03);
      --border-light: rgba(255, 255, 255, 0.06);
      --text-primary: #FFFFFF;
      --text-body: #B0B8D0;
      --text-muted: #6B7394;
      --cyan: #00F0FF;
      --gold: #FFB800;
      --success: #00E676;
      --danger: #FF5252;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: 'Inter', 'SF Pro Display', system-ui;
      --container-max: 1200px;
      --radius-card: 20px;
      --radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.4);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--primary-bg);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: var(--cyan);
      transition: color 0.2s, opacity 0.2s;
    }

    a:hover {
      color: var(--gold);
    }

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

    @media (max-width: 576px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: transparent;
      backdrop-filter: blur(0px);
      transition: background 0.3s, backdrop-filter 0.3s, border-bottom 0.3s;
      border-bottom: 1px solid transparent;
    }

    .header.scrolled {
      background: rgba(11, 12, 30, 0.85);
      backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, #00F0FF 0%, #7B61FF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 0.02em;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      background: none;
      -webkit-text-fill-color: var(--cyan);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-primary);
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--cyan);
      box-shadow: 0 0 8px var(--cyan);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--cyan);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--cyan);
      color: #0B0C1E;
      font-weight: 700;
      padding: 10px 24px;
      border-radius: 50px;
      font-size: 0.9rem;
      box-shadow: 0 0 16px rgba(0, 240, 255, 0.5);
      transition: 0.25s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      display: inline-block;
    }

    .btn-nav:hover {
      background: var(--gold);
      color: #0B0C1E;
      box-shadow: 0 0 28px rgba(255, 184, 0, 0.7);
      transform: scale(1.05);
    }

    .menu-toggle {
      display: none;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
    }

    #menu-checkbox {
      display: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      #menu-checkbox:checked ~ .mobile-menu {
        display: flex;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(8, 10, 26, 0.95);
        backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        border-bottom: 1px solid rgba(255,255,255,0.08);
        animation: fadeDown 0.3s ease;
      }
      .mobile-menu a {
        color: white;
        font-size: 1.2rem;
        font-weight: 500;
      }
    }

    @keyframes fadeDown {
      from { opacity: 0; transform: translateY(-10px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 80px 0;
      }
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
      letter-spacing: 0.02em;
    }

    @media (max-width: 576px) {
      .section-title {
        font-size: 1.8rem;
      }
    }

    .glass-card {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.06);
      border-radius: var(--radius-card);
      backdrop-filter: blur(20px) saturate(120%);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease-out;
    }

    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.3);
      box-shadow: 0 12px 40px rgba(0, 240, 255, 0.15);
      transform: translateY(-4px);
    }

    .btn-primary {
      background: var(--cyan);
      color: #0B0C1E;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
      transition: 0.25s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--gold);
      box-shadow: 0 0 32px rgba(255, 184, 0, 0.6);
      transform: scale(1.05);
      color: #0B0C1E;
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
    }

    .btn-secondary:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: var(--gold);
      color: var(--gold);
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-left {
      flex: 1 1 50%;
    }

    .hero-right {
      flex: 1 1 40%;
      position: relative;
      min-height: 360px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 32px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,240,255,0.2);
    }

    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 30%, rgba(0,240,255,0.15), transparent 70%);
      mix-blend-mode: overlay;
    }

    .floating-orb {
      position: absolute;
      width: 120px;
      height: 120px;
      background: radial-gradient(circle, rgba(255,184,0,0.5) 0%, transparent 70%);
      top: 20%;
      right: 10%;
      filter: blur(30px);
      animation: float 6s infinite ease-in-out;
    }

    @keyframes float {
      0% { transform: translate(0,0); }
      50% { transform: translate(15px, -15px); }
      100% { transform: translate(0,0); }
    }

    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      color: white;
      margin: 16px 0 24px;
      text-shadow: 0 0 12px rgba(0,240,255,0.3);
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.2rem;
      }
    }

    /* 痛点 */
    .pain-points {
      background: #080A1A;
      text-align: center;
    }

    .pain-item {
      font-size: 1.4rem;
      font-weight: 500;
      color: #8A90B0;
      margin: 28px 0;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
    }

    /* 解决方案网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }

    @media (max-width: 992px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 576px) {
      .grid-3 { grid-template-columns: 1fr; }
    }

    .solution-card {
      padding: 32px 24px;
      text-align: center;
    }

    /* 数据指标 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      text-align: center;
    }
    @media (max-width: 768px) {
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--gold);
      font-family: var(--font-mono);
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .step {
      text-align: center;
      flex:1;
      position: relative;
    }
    .step-icon {
      width: 64px;
      height: 64px;
      border: 2px solid var(--cyan);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 1.8rem;
      color: white;
    }
    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        gap: 32px;
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      margin-bottom: 8px;
    }
    details summary {
      padding: 20px 0;
      font-weight: 600;
      color: white;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
    }
    details[open] {
      border-left: 3px solid var(--cyan);
      padding-left: 16px;
    }

    footer {
      background: #080A1A;
      padding: 48px 0;
      color: var(--text-muted);
    }