/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-dark: #00c853;
      --secondary: #0B0F19;
      --surface: #131a2b;
      --text: #F0F2F5;
      --text-muted: #b0b8c5;
      --accent: #B388FF;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --card-bg: rgba(11, 15, 25, 0.7);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 50px;
      --shadow-glow: 0 0 30px rgba(0, 230, 118, 0.25);
      --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--secondary);
      color: var(--text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      padding: 16px 0;
      transition: background 0.25s ease, backdrop-filter 0.25s ease;
    }
    .header.scrolled {
      background: rgba(11, 15, 25, 0.8);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      color: var(--text);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      color: var(--primary);
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: #0B0F19;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      filter: brightness(1.2);
      box-shadow: 0 0 28px rgba(0,230,118,0.5);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      cursor: pointer;
      transition: all 0.25s ease;
    }
    .btn-outline:hover {
      background: rgba(0,230,118,0.1);
      box-shadow: 0 0 20px rgba(0,230,118,0.3);
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--text);
      transition: 0.3s;
      border-radius: 4px;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(11,15,25,0.96);
      backdrop-filter: blur(30px);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2rem;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 99;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      font-size: 2rem;
      color: var(--text);
      text-decoration: none;
      font-weight: 600;
    }

    /* 区块间距 */
    section {
      padding: 100px 0;
    }

    /* Hero */
    .hero {
      position: relative;
      display: flex;
      align-items: center;
      min-height: 90vh;
      background: radial-gradient(circle at 30% 40%, rgba(0,230,118,0.12) 0%, transparent 50%),
                  radial-gradient(circle at 80% 20%, rgba(179,136,255,0.15) 0%, transparent 45%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero h1 {
      font-size: 4rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      background: linear-gradient(135deg, #ffffff 0%, #e0f2e0 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
    }
    .hero p {
      font-size: 1.3rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-lg);
      height: 420px;
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.6);
      border: 1px solid rgba(255,255,255,0.1);
    }

    /* 板块标题 */
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 4px;
      background: var(--primary);
      border-radius: 4px;
    }
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
      margin-top: 3rem;
    }
    .pain-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 2rem;
      transition: all var(--transition);
    }
    .pain-card:hover {
      border-color: rgba(0,230,118,0.4);
      transform: translateY(-5px);
      box-shadow: 0 20px 25px -10px rgba(0,230,118,0.1);
    }

    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 3rem;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 2rem;
      border: 1px solid rgba(255,255,255,0.05);
      transition: all 0.25s;
    }
    .solution-card:hover {
      border-color: rgba(0,230,118,0.35);
      box-shadow: 0 0 30px rgba(0,230,118,0.12);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 900;
      color: var(--primary);
    }
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
      margin-top: 2.5rem;
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 2rem;
    }
    .faq-item {
      background: rgba(255,255,255,0.02);
      border-radius: 14px;
      padding: 1.2rem 1.5rem;
      border: 1px solid rgba(255,255,255,0.05);
      cursor: pointer;
      transition: 0.3s;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }

    .cta-section {
      background: linear-gradient(135deg, #0a0f1a 0%, #0f172a 100%);
      border-radius: var(--radius-lg);
      text-align: center;
      padding: 80px 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
      padding-top: 3rem;
      border-top: 1px solid rgba(255,255,255,0.07);
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.8rem; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .pain-grid, .solution-grid, .testimonial-grid, .faq-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }