/* roulang page: index */
:root {
      --bg-primary: #0A0F24;
      --bg-deeper: #060B1A;
      --accent-cyan: #00E5FF;
      --accent-gold: #FFD700;
      --text-primary: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #6B7B8D;
      --card-bg: rgba(255,255,255,0.03);
      --card-border: rgba(255,255,255,0.08);
      --gradient-btn: linear-gradient(135deg, #00E5FF 0%, #007BFF 100%);
      --gradient-divider: linear-gradient(90deg, transparent, #00E5FF, transparent);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-pill: 50px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 20px rgba(0,229,255,0.4);
      --transition-base: 0.3s ease;
      --max-width: 1200px;
      --section-gap: 120px;
      --font-en: "Inter", "SF Pro Display", system-ui, -apple-system;
    }
    *,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background: var(--bg-primary);
      color: var(--text-body);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    a { color: var(--accent-cyan); text-decoration: none; transition: var(--transition-base); border-bottom: 1px solid transparent; }
    a:hover { border-bottom-color: var(--accent-cyan); }
    img { max-width: 100%; height: auto; display: block; }
    button, input { font-family: inherit; }
    h1 { font-size: 48px; font-weight: 700; line-height: 1.2; color: var(--text-primary); }
    h2 { font-size: 36px; font-weight: 600; line-height: 1.3; color: var(--text-primary); }
    h3 { font-size: 24px; font-weight: 500; line-height: 1.4; color: var(--text-primary); }
    h4 { font-size: 20px; font-weight: 500; line-height: 1.5; color: var(--text-primary); }
    p { max-width: 680px; color: var(--text-body); }

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

    /* 导航 */
    header {
      position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
      background: rgba(10,15,36,0.85); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,229,255,0.2);
      transition: all 0.4s ease;
    }
    header.scrolled { background: rgba(10,15,36,0.95); box-shadow: 0 4px 24px rgba(0,0,0,0.6); }
    nav { display: flex; align-items: center; justify-content: space-between; height: 70px; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
    .logo { font-size: 28px; font-weight: 700; color: var(--accent-cyan); font-family: var(--font-en); letter-spacing: -0.5px; }
    .logo span { color: var(--text-primary); font-weight: 400; }
    .nav-links { display: flex; gap: 32px; list-style: none; }
    .nav-links a { color: var(--text-body); font-size: 15px; font-weight: 500; padding: 8px 0; border-bottom: 2px solid transparent; }
    .nav-links a:hover, .nav-links a.active { color: var(--accent-cyan); border-bottom-color: var(--accent-cyan); }
    .nav-cta { display: inline-block; padding: 10px 28px; background: var(--gradient-btn); color: #fff !important; border-radius: var(--radius-pill); font-weight: 600; font-size: 14px; box-shadow: var(--shadow-glow); border: none !important; transition: all 0.3s ease; }
    .nav-cta:hover { filter: brightness(1.3); box-shadow: 0 0 30px rgba(0,229,255,0.6); transform: scale(1.05); }
    .hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 10px; }
    .hamburger span { width: 26px; height: 2.5px; background: var(--accent-cyan); border-radius: 2px; transition: 0.3s; }
    .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(6px,6px); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

    /* 移动端抽屉 */
    .mobile-menu { display: none; position: fixed; top: 70px; left: 0; width: 100%; height: calc(100vh - 70px); background: rgba(10,15,36,0.98); backdrop-filter: blur(30px); flex-direction: column; justify-content: center; align-items: center; gap: 30px; z-index: 999; }
    .mobile-menu.active { display: flex; }
    .mobile-menu a { font-size: 22px; color: var(--text-primary); font-weight: 500; border-bottom: none; }
    .mobile-menu a:hover { color: var(--accent-cyan); }

    /* Hero */
    #hero {
      position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center;
      background: radial-gradient(ellipse at 50% 0%, rgba(0,229,255,0.15) 0%, transparent 60%), var(--bg-primary);
      overflow: hidden; padding-top: 70px;
    }
    .hero-particles { position: absolute; inset: 0; pointer-events: none; }
    .hero-particles .particle { position: absolute; width: 3px; height: 3px; background: var(--accent-cyan); border-radius: 50%; animation: floatUp 6s infinite ease-in; opacity: 0; }
    @keyframes floatUp { 0% { transform: translateY(100vh) scale(0); opacity: 0; } 20% { opacity: 0.8; } 80% { opacity: 0.6; } 100% { transform: translateY(-10vh) scale(2); opacity: 0; } }
    .hero-grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(0,229,255,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(0,229,255,0.05) 1px, transparent 1px); background-size: 60px 60px; mask-image: radial-gradient(circle at 50% 50%, black 40%, transparent 80%); }
    .hero-content { position: relative; z-index: 2; max-width: 800px; padding: 0 24px; }
    .hero-content h1 { margin-bottom: 20px; }
    .hero-content h1 .highlight { color: var(--accent-cyan); }
    .hero-content .hero-subtitle { font-size: 18px; color: var(--text-body); margin-bottom: 16px; }
    .hero-stat { font-size: 20px; margin-bottom: 36px; }
    .hero-stat .gold { color: var(--accent-gold); font-weight: 700; font-size: 28px; font-family: var(--font-en); }
    .hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
    .btn-primary { display: inline-block; padding: 14px 36px; background: var(--gradient-btn); color: var(--text-primary); font-weight: 600; border-radius: var(--radius-pill); box-shadow: var(--shadow-glow); transition: all 0.3s ease; border: none; font-size: 16px; cursor: pointer; }
    .btn-primary:hover { filter: brightness(1.3); box-shadow: 0 0 30px rgba(0,229,255,0.6); transform: scale(1.05); }
    .btn-secondary { display: inline-block; padding: 14px 36px; background: transparent; color: var(--accent-cyan); border: 1px solid rgba(0,229,255,0.5); border-radius: var(--radius-pill); font-weight: 600; transition: all 0.3s ease; font-size: 16px; cursor: pointer; }
    .btn-secondary:hover { background: rgba(0,229,255,0.1); border-color: var(--accent-cyan); }

    /* Section 通用 */
    section { padding: var(--section-gap) 0; }
    .section-header { text-align: center; margin-bottom: 60px; }
    .section-header h2 { margin-bottom: 16px; }
    .section-header p { margin: 0 auto; }

    /* 核心优势 */
    .advantages-grid { display: grid; grid-template-columns: 1.2fr 0.9fr 0.9fr; gap: 24px; }
    .advantage-card {
      background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius-lg);
      padding: 36px 28px; backdrop-filter: blur(20px); transition: all 0.3s ease;
      box-shadow: var(--shadow-card); position: relative; overflow: hidden;
    }
    .advantage-card:hover { border-color: rgba(0,229,255,0.3); box-shadow: 0 12px 40px rgba(0,229,255,0.15); transform: translateY(-4px); }
    .advantage-card.large { grid-row: span 2; display: flex; flex-direction: column; justify-content: center; }
    .adv-icon { font-size: 38px; color: var(--accent-cyan); margin-bottom: 20px; }
    .advantage-card h3 { margin-bottom: 12px; }
    .advantage-card p { font-size: 15px; }

    /* 解决方案 左右交替 */
    .solution-row { display: flex; align-items: center; gap: 60px; margin-bottom: 100px; }
    .solution-row.reverse { flex-direction: row-reverse; }
    .solution-text { flex: 1; }
    .solution-text h2 { margin-bottom: 20px; }
    .solution-text p { margin-bottom: 20px; }
    .solution-image { flex: 1; border-radius: var(--radius-lg); overflow: hidden; background: var(--card-bg); border: 1px solid var(--card-border); }
    .solution-image img { width: 100%; height: auto; }
    .text-link { color: var(--accent-cyan); font-weight: 600; }

    /* 流程 */
    .steps-container { display: flex; justify-content: space-between; align-items: flex-start; position: relative; }
    .steps-container::before { content:''; position: absolute; top: 36px; left: 10%; width: 80%; height: 2px; background: var(--gradient-divider); z-index: 0; }
    .step-item { flex: 1; text-align: center; position: relative; z-index: 1; padding: 0 16px; }
    .step-num { width: 72px; height: 72px; border-radius: 50%; background: var(--bg-deeper); border: 2px solid var(--accent-cyan); display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; font-size: 28px; font-weight: 700; color: var(--accent-cyan); box-shadow: 0 0 28px rgba(0,229,255,0.35); }
    .step-item h4 { margin-bottom: 8px; }
    .step-item p { font-size: 14px; margin: 0 auto; }

    /* 证言 */
    .testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .testimonial-card {
      background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius-lg);
      padding: 28px; backdrop-filter: blur(20px); transition: all 0.3s ease; box-shadow: var(--shadow-card);
    }
    .testimonial-card:hover { border-color: rgba(0,229,255,0.3); box-shadow: 0 12px 40px rgba(0,229,255,0.15); transform: translateY(-4px); }
    .testimonial-header { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
    .testimonial-avatar { width: 48px; height: 48px; border-radius: 50%; background: rgba(0,229,255,0.2); display: flex; align-items: center; justify-content: center; font-size: 20px; color: var(--accent-cyan); }
    .testimonial-info h4 { font-size: 16px; }
    .testimonial-info span { font-size: 13px; color: var(--text-muted); }
    .stars { color: var(--accent-gold); margin-bottom: 10px; }
    .testimonial-card blockquote { font-style: italic; font-size: 15px; color: var(--text-body); }

    /* FAQ */
    .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
    .faq-item { background: rgba(255,255,255,0.03); border-radius: var(--radius-md); border-left: 3px solid var(--accent-cyan); overflow: hidden; transition: all 0.3s; }
    .faq-item.active { background: rgba(0,229,255,0.05); border-left-width: 5px; box-shadow: 0 0 20px rgba(0,229,255,0.1); }
    .faq-question { padding: 20px 24px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-weight: 500; color: var(--text-primary); }
    .faq-icon { transition: 0.3s transform; color: var(--accent-cyan); font-size: 18px; }
    .faq-item.active .faq-icon { transform: rotate(45deg); }
    .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; padding: 0 24px; }
    .faq-item.active .faq-answer { max-height: 300px; padding-bottom: 20px; }

    /* CTA */
    #cta { background: var(--bg-deeper); text-align: center; padding: 100px 0; }
    #cta h2 { margin-bottom: 16px; }
    #cta p { margin: 0 auto 32px; }
    .cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

    /* Footer */
    footer { background: var(--bg-deeper); padding: 80px 0 40px; border-top: 1px solid rgba(0,229,255,0.1); }
    .footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
    .footer-brand p { margin-bottom: 16px; font-size: 14px; }
    .footer-col h4 { margin-bottom: 16px; font-size: 18px; }
    .footer-col ul { list-style: none; }
    .footer-col ul li { margin-bottom: 10px; }
    .footer-col ul a { color: var(--text-muted); font-size: 14px; }
    .footer-col ul a:hover { color: var(--accent-cyan); }
    .social-icons { display: flex; gap: 12px; margin-top: 12px; }
    .social-icons a { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.05); color: var(--accent-cyan); font-size: 18px; transition: all 0.3s; border: 1px solid rgba(255,255,255,0.08); }
    .social-icons a:hover { background: var(--accent-cyan); color: var(--bg-primary); box-shadow: var(--shadow-glow); }
    .copyright { text-align: center; padding-top: 24px; border-top: 1px solid var(--gradient-divider); font-size: 12px; color: var(--text-muted); }

    /* Scroll Reveal */
    .reveal { opacity: 0; transform: translateY(30px); transition: all 0.8s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }

    /* 响应式 */
    @media (max-width: 1024px) {
      :root { --section-gap: 80px; }
      h1 { font-size: 38px; } h2 { font-size: 30px; } h3 { font-size: 22px; }
      .advantages-grid { grid-template-columns: 1fr 1fr; }
      .advantage-card.large { grid-row: span 1; grid-column: 1 / -1; }
      .solution-row { gap: 40px; }
      .steps-container { flex-wrap: wrap; }
      .steps-container::before { display: none; }
      .step-item { flex: 0 0 50%; margin-bottom: 30px; }
      .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      :root { --section-gap: 60px; }
      h1 { font-size: 32px; } h2 { font-size: 26px; } h3 { font-size: 20px; } body { font-size: 15px; }
      header .nav-links, header .nav-cta { display: none; }
      .hamburger { display: flex; }
      .advantages-grid, .testimonials-grid, .footer-grid { grid-template-columns: 1fr; }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      .steps-container { flex-direction: column; align-items: center; }
      .step-item { flex: auto; width: 100%; max-width: 400px; }
      .hero-content h1 { font-size: 32px; }
      .hero-stat { font-size: 17px; }
      .hero-stat .gold { font-size: 24px; }
    }
    @media (max-width: 520px) {
      h1 { font-size: 28px; } h2 { font-size: 22px; }
      .hero-buttons { flex-direction: column; align-items: center; }
      .hero-buttons .btn-primary, .hero-buttons .btn-secondary { width: 80%; text-align: center; }
    }