/* roulang page: index */
:root {
      --primary-dark: #0A0E27;
      --secondary-cyan: #00F0FF;
      --accent-red: #FF3366;
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(0,240,255,0.2);
      --text-body: #E0E6F0;
      --text-heading: #FFFFFF;
      --text-muted: #A0A8C0;
      --bg-gradient: linear-gradient(135deg, #0A0E27 0%, #1A1F3A 50%, #0F1530 100%);
      --card-radius: 16px;
      --btn-radius: 50px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 12px 48px rgba(0,240,255,0.15);
      --blur-amount: 20px;
      --transition-smooth: all 0.25s ease;
      --section-gap: 120px;
      --content-max: 1200px;
      --font-en: 'Inter', 'SF Pro Display', sans-serif;
      --font-zh: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      font-family: var(--font-zh);
      background: var(--primary-dark);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      background-image: var(--bg-gradient);
      background-attachment: fixed;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .hero-title, .section-title {
      font-family: var(--font-zh);
      color: var(--text-heading);
    }

    a {
      color: var(--secondary-cyan);
      text-decoration: none;
      transition: var(--transition-smooth);
    }

    a:hover {
      color: #fff;
      text-decoration: none;
    }

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

    .container {
      max-width: var(--content-max);
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(var(--blur-amount));
      -webkit-backdrop-filter: blur(var(--blur-amount));
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      border-color: rgba(0,240,255,0.5);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    /* 按钮 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--btn-radius);
      padding: 14px 36px;
      font-size: 16px;
      text-align: center;
      transition: var(--transition-smooth);
      cursor: pointer;
      border: none;
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--secondary-cyan);
      color: var(--primary-dark);
      box-shadow: 0 0 20px rgba(0,240,255,0.6);
    }

    .btn-primary:hover {
      background: #33f5ff;
      box-shadow: 0 0 35px rgba(0,240,255,0.9);
      transform: scale(1.03);
      color: #000;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary-cyan);
      color: var(--secondary-cyan);
      box-shadow: 0 0 12px rgba(0,240,255,0.2);
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      border-color: #fff;
      color: #fff;
      box-shadow: 0 0 25px rgba(0,240,255,0.6);
      transform: scale(1.02);
    }

    .btn-accent {
      background: var(--accent-red);
      color: #fff;
      box-shadow: 0 0 18px rgba(255,51,102,0.5);
    }

    .btn-accent:hover {
      background: #ff4d7a;
      box-shadow: 0 0 35px rgba(255,51,102,0.8);
      transform: scale(1.03);
      color: #fff;
    }

    /* 导航 */
    .top-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: rgba(10,14,39,0.85);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-bottom: 1px solid rgba(0,240,255,0.1);
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--content-max);
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo {
      font-size: 28px;
      font-weight: 700;
      color: #fff;
      letter-spacing: 1px;
    }

    .logo span {
      color: var(--secondary-cyan);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 16px;
      position: relative;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary-cyan);
      transition: 0.3s;
      box-shadow: 0 0 10px var(--secondary-cyan);
    }

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

    .mega-trigger {
      position: relative;
    }

    .mega-panel {
      position: absolute;
      top: 60px;
      left: 50%;
      transform: translateX(-50%);
      width: 620px;
      background: rgba(10,14,39,0.96);
      backdrop-filter: blur(40px);
      border: 1px solid rgba(0,240,255,0.3);
      border-radius: 12px;
      padding: 28px;
      display: flex;
      gap: 32px;
      opacity: 0;
      visibility: hidden;
      transition: 0.25s ease;
      box-shadow: 0 20px 40px rgba(0,0,0,0.7);
      z-index: 200;
    }

    .mega-trigger:hover .mega-panel {
      opacity: 1;
      visibility: visible;
    }

    .mega-left {
      flex: 1;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .mega-icon-card {
      background: rgba(255,255,255,0.04);
      border-radius: 12px;
      padding: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
      border: 1px solid transparent;
      transition: 0.2s;
    }

    .mega-icon-card:hover {
      border-color: var(--secondary-cyan);
      background: rgba(0,240,255,0.05);
    }

    .mega-right {
      width: 180px;
    }

    .mega-right img {
      border-radius: 10px;
      margin-bottom: 8px;
    }

    .hamburger {
      display: none;
      font-size: 26px;
      color: #fff;
    }

    @media screen and (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-left {
      flex: 1 1 500px;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      background: linear-gradient(to right, #fff, var(--secondary-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 20px;
      margin: 24px 0;
      color: #ccc;
    }

    .pain-point {
      color: var(--accent-red);
      font-weight: 600;
      margin: 16px 0 32px;
    }

    .hero-right {
      flex: 1 1 500px;
      position: relative;
    }

    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      width: 100%;
      height: 420px;
      border-radius: 24px;
      border: 1px solid rgba(0,240,255,0.25);
      box-shadow: 0 0 50px rgba(0,240,255,0.3);
      backdrop-filter: blur(5px);
      position: relative;
      overflow: hidden;
    }

    .particles {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      pointer-events: none;
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-title {
        font-size: 36px;
      }
    }

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

    .section-title {
      font-size: 36px;
      font-weight: 600;
      text-align: center;
      margin-bottom: 16px;
      position: relative;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 80px;
      height: 3px;
      background: var(--secondary-cyan);
      margin: 12px auto 0;
      box-shadow: 0 0 15px var(--secondary-cyan);
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .grid-3 {
        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;
      }
    }

    blockquote {
      font-style: italic;
      color: #ddd;
    }

    .accordion-title {
      font-size: 18px;
      background: transparent;
      border: 1px solid rgba(0,240,255,0.15);
    }

    .accordion-item.is-active .accordion-title {
      border-color: var(--secondary-cyan);
      background: rgba(0,240,255,0.03);
    }

    footer {
      background: #060A1A;
      border-top: 1px solid rgba(0,240,255,0.1);
      padding-top: 60px;
    }