/* roulang page: index */
:root {
      --bg-deep: #0A0E17;
      --cyan-electric: #00F0FF;
      --purple-neon: #B300FF;
      --orange-alert: #FF3C00;
      --text-white: #FFFFFF;
      --text-body: rgba(255,255,255,0.8);
      --text-muted: rgba(255,255,255,0.5);
      --glass-bg: rgba(255,255,255,0.03);
      --glass-border: rgba(0,240,255,0.15);
      --glass-border-hover: rgba(0,240,255,0.5);
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --glow-cyan: 0 0 20px rgba(0,240,255,0.4);
      --glow-cyan-strong: 0 0 35px rgba(0,240,255,0.7);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-sm: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-tech: "DIN Alternate", "Rajdhani", "Orbitron", sans-serif;
      --transition-fast: 0.25s ease;
      --transition-slow: 0.3s ease;
      --max-width: 1280px;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      background-image: 
        linear-gradient(rgba(0,240,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,240,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }

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

    h1, h2, h3 {
      color: var(--text-white);
      font-weight: 700;
    }

    h1 {
      font-size: 56px;
      font-weight: 800;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 24px;
      text-shadow: 0 0 15px rgba(0,240,255,0.3);
    }

    h3 {
      font-size: 24px;
      font-weight: 600;
      color: #E0F0FF;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-fast);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 700;
      border: none;
      outline: none;
      transition: var(--transition-fast);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--cyan-electric), #0088CC);
      color: var(--bg-deep);
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      box-shadow: var(--glow-cyan);
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      box-shadow: var(--glow-cyan-strong);
      transform: scale(1.03);
    }

    .btn-ghost {
      background: transparent;
      border: 2px solid var(--cyan-electric);
      color: var(--cyan-electric);
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-ghost:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 15px rgba(0,240,255,0.4);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10,14,23,0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,240,255,0.1);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--cyan-electric);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, var(--cyan-electric), var(--purple-neon));
      clip-path: polygon(50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
      display: inline-block;
    }

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

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: #CCD6E0;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a:hover {
      color: var(--cyan-electric);
      text-shadow: 0 0 8px rgba(0,240,255,0.6);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan-electric);
      box-shadow: 0 0 10px var(--cyan-electric);
      transition: width 0.25s ease;
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--cyan-electric);
      border-radius: 2px;
      transition: var(--transition-fast);
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      height: calc(100vh - 64px);
      background: rgba(10,14,23,0.95);
      backdrop-filter: blur(24px);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
      display: none;
      z-index: 999;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      font-size: 20px;
      color: #CCD6E0;
      font-weight: 600;
    }

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

    .section-header {
      margin-bottom: 48px;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(10,14,23,0.6);
      padding-top: 80px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .hero-title {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero-title span {
      background: linear-gradient(135deg, var(--cyan-electric), var(--purple-neon));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 25px rgba(0,240,255,0.5);
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 40px;
      opacity: 0.9;
    }

    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-img-placeholder {
      width: 100%;
      max-width: 500px;
      border-radius: 24px;
      box-shadow: 0 0 60px rgba(0,240,255,0.3);
      border: 1px solid rgba(0,240,255,0.2);
    }

    /* 痛点区 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pain-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,60,0,0.3);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition-slow);
      box-shadow: 0 4px 20px rgba(255,60,0,0.08);
    }

    .pain-card:hover {
      transform: translateY(-4px);
      border-color: rgba(255,60,0,0.6);
      box-shadow: 0 8px 28px rgba(255,60,0,0.2);
    }

    .pain-icon {
      font-size: 28px;
      color: var(--orange-alert);
      margin-bottom: 16px;
    }

    /* 解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .solution-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 0 0 24px;
      overflow: hidden;
      transition: var(--transition-slow);
      box-shadow: var(--card-shadow);
    }

    .solution-card:hover {
      border-color: var(--glass-border-hover);
      transform: translateY(-6px);
      box-shadow: 0 12px 36px rgba(0,240,255,0.25);
    }

    .solution-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 12px 12px 0 0;
    }

    .solution-content {
      padding: 24px 24px 0;
    }

    /* 成果数据 */
    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-item {
      background: rgba(10,14,23,0.8);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: var(--radius-card);
      padding: 32px 16px;
      backdrop-filter: blur(8px);
    }

    .stat-number {
      font-family: var(--font-tech);
      font-size: 48px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--cyan-electric), #fff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 25px rgba(0,240,255,0.6);
    }

    /* 证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: var(--glass-bg);
      backdrop-filter: blur(10px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: flex-start;
      border-left: 4px solid var(--cyan-electric);
    }

    .avatar {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, var(--cyan-electric), var(--purple-neon));
      border-radius: 50%;
      flex-shrink: 0;
    }

    .quote {
      font-style: italic;
      color: var(--text-body);
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(0,240,255,0.1);
      border-radius: 12px;
      overflow: hidden;
      transition: var(--transition-fast);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: #fff;
    }

    .faq-toggle {
      font-size: 24px;
      color: var(--cyan-electric);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
      padding: 0 24px;
      color: var(--text-body);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }

    /* CTA */
    .cta-block {
      background: rgba(0,0,0,0.4);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 32px;
      padding: 80px 24px;
      text-align: center;
      backdrop-filter: blur(12px);
    }

    .footer {
      background: #05070a;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(0,240,255,0.1);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-logo {
      font-size: 24px;
      color: var(--cyan-electric);
      font-weight: 700;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 44px; }
      h2 { font-size: 32px; }
      .hero-grid { grid-template-columns: 1fr; }
      .solutions-grid, .testimonials-grid { grid-template-columns: 1fr; }
      .results-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .pain-grid, .footer-grid { grid-template-columns: 1fr; }
      .results-grid { grid-template-columns: 1fr; }
      .hero { text-align: center; }
    }