/* roulang page: index */
:root {
      --bg-deep: #0A0E1A;
      --bg-card: rgba(15, 25, 45, 0.7);
      --primary: #00C2FF;
      --primary-dark: #0088CC;
      --accent: #FF6B2C;
      --text-white: #FFFFFF;
      --text-light: #E0F0FF;
      --text-body: #A0B8D0;
      --text-muted: #6B7F99;
      --border-glow: rgba(0,194,255,0.2);
      --border-card: rgba(0,194,255,0.15);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 24px rgba(0,194,255,0.6);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      background: radial-gradient(circle at 30% 10%, #1b2a41, #0A0E1A 80%);
      font-family: var(--font-sans);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 容器 */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 - 桌面透明玻璃 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 26, 0.8);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0,194,255,0.15);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-white);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), #0077b6);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-weight: 500;
      color: #B0C8E0;
    }
    .nav-links a {
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 8px var(--primary);
    }

    .nav-cta {
      background: var(--primary);
      color: #0A0E1A;
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      transition: all var(--transition);
      box-shadow: 0 4px 12px rgba(0,194,255,0.4);
    }
    .nav-cta:hover {
      background: #33d0ff;
      box-shadow: 0 0 20px rgba(0,194,255,0.8);
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 26, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(0,194,255,0.2);
      justify-content: space-around;
      align-items: center;
      padding: 12px 16px;
      z-index: 1000;
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 11px;
      color: #8899b0;
      transition: 0.2s;
      gap: 4px;
    }
    .mobile-nav a.active, .mobile-nav a:hover {
      color: var(--primary);
    }
    .mobile-nav .nav-cta-mobile {
      background: var(--primary);
      color: #0A0E1A;
      padding: 8px 20px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 13px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 70px;
    }
    .hero-bg {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      width: 100%;
    }
    .hero-text {
      max-width: 600px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-white);
      margin-bottom: 20px;
    }
    .hero h1 span {
      color: var(--primary);
      text-shadow: 0 0 15px rgba(0,194,255,0.6);
    }
    .hero-sub {
      font-size: 18px;
      color: #B0C8E0;
      margin-bottom: 40px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00C2FF, #0088CC);
      border: none;
      color: #fff;
      padding: 16px 36px;
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: 16px;
      box-shadow: 0 4px 20px rgba(0,194,255,0.4);
      transition: all var(--transition);
      display: inline-block;
    }
    .btn-primary:hover {
      filter: brightness(1.2);
      box-shadow: var(--shadow-glow);
    }
    .btn-outline {
      border: 1px solid var(--primary);
      background: transparent;
      color: var(--primary);
      padding: 16px 36px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: rgba(0,194,255,0.1);
    }
    .hero-visual {
      width: 45%;
      min-height: 350px;
      background: radial-gradient(circle at center, rgba(0,194,255,0.15), transparent 70%);
      border-radius: 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: #7B8FA8;
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }

    /* 痛点 cards 横向滚动 */
    .pain-grid {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
    }
    .pain-card {
      flex: 0 0 300px;
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-lg);
      padding: 30px 24px;
      box-shadow: var(--shadow-card);
    }
    .pain-icon {
      font-size: 28px;
      margin-bottom: 20px;
    }

    /* 解决方案错位卡片 */
    .solutions-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      margin-top: 20px;
    }
    .solution-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      width: 260px;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s;
      position: relative;
    }
    .solution-card:nth-child(odd) { margin-top: -25px; }
    .solution-card:nth-child(even) { margin-top: 25px; }
    .solution-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 16px 48px rgba(0,194,255,0.2);
    }

    /* 数据 */
    .stats {
      display: flex;
      justify-content: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .stat-item h3 {
      font-size: 42px;
      font-weight: 700;
      background: linear-gradient(to right, #00C2FF, #88E0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 证言 */
    .testimonial-grid {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .testimonial-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 24px;
      display: flex;
      gap: 20px;
      max-width: 480px;
    }

    /* FAQ */
    .faq-item {
      background: rgba(15,25,45,0.6);
      backdrop-filter: blur(8px);
      border-left: 4px solid var(--primary);
      border-radius: 0 var(--radius-md) var(--radius-md) 0;
      margin-bottom: 16px;
      transition: 0.3s;
    }
    .faq-question {
      padding: 20px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 20px;
      color: #B0C8E0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA */
    .cta-dark {
      background: #080C16;
      border-top: 2px solid var(--primary);
      text-align: center;
      padding: 80px 0;
    }

    footer {
      background: #080C16;
      padding: 50px 0 30px;
    }

    @media (max-width: 1023px) {
      .solution-card:nth-child(odd), .solution-card:nth-child(even) { margin-top: 0; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-nav { display: flex; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero h1 { font-size: 34px; }
      .hero-visual { width: 100%; min-height: 250px; }
    }