/* roulang page: index */
:root {
      --primary-dark: #0D1B2A;
      --secondary-dark: #1B263B;
      --accent-green: #00E676;
      --accent-orange: #FF6D00;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark-section: #0B132B;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --border-dark: #2A3B53;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px -5px rgba(13,27,42,0.08);
      --shadow-lg: 0 20px 30px -10px rgba(0,230,118,0.15);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }

    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body { font-family: var(--font-stack); background-color: var(--bg-light); color: var(--text-main); line-height: 1.65; -webkit-font-smoothing: antialiased; }
    a { color: inherit; text-decoration: none; transition: all 0.25s ease; }
    img { max-width: 100%; height: auto; display: block; }
    ul { list-style: none; }
    button, input, select, textarea { font-family: inherit; }

    .container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 24px; }
    
    /* Top Header Bar */
    .top-bar { background-color: var(--primary-dark); color: #94A3B8; font-size: 13px; border-bottom: 1px solid var(--border-dark); }
    .top-bar-inner { display: flex; justify-content: space-between; align-items: center; height: 38px; }
    .status-indicator { display: inline-flex; align-items: center; gap: 8px; }
    .pulse-dot { width: 8px; height: 8px; background-color: var(--accent-green); border-radius: 50%; box-shadow: 0 0 8px var(--accent-green); animation: pulse 2s infinite; }
    @keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.4; transform: scale(0.85); } }

    /* Main Navigation */
    .main-nav-wrapper { position: sticky; top: 0; z-index: 1000; background: rgba(255, 255, 255, 0.96); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-color); }
    .main-nav { display: flex; justify-content: space-between; align-items: center; height: 76px; }
    .brand-logo { font-size: 22px; font-weight: 800; color: var(--primary-dark); display: flex; align-items: center; gap: 10px; letter-spacing: -0.5px; }
    .brand-icon { width: 34px; height: 34px; background: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark)); color: var(--accent-green); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-weight: 900; font-size: 18px; border: 1px solid rgba(0,230,118,0.3); }
    
    .nav-links { display: flex; gap: 28px; align-items: center; }
    .nav-links a { font-weight: 500; font-size: 15px; color: var(--secondary-dark); position: relative; padding: 6px 0; }
    .nav-links a:hover, .nav-links a.active { color: var(--accent-orange); }
    .nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--accent-orange); transition: width 0.25s ease; }
    .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
    
    .btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 22px; font-weight: 600; font-size: 15px; border-radius: var(--radius-sm); cursor: pointer; transition: all 0.25s ease; border: none; }
    .btn-primary { background-color: var(--accent-green); color: #000000; box-shadow: 0 4px 14px rgba(0, 230, 118, 0.35); }
    .btn-primary:hover { background-color: #00c864; transform: translateY(-2px); box-shadow: var(--shadow-lg); }
    .btn-secondary { background-color: var(--accent-orange); color: #FFFFFF; }
    .btn-secondary:hover { background-color: #e66200; transform: translateY(-2px); }
    .btn-outline { background: transparent; border: 1.5px solid var(--accent-green); color: var(--accent-green); }
    .btn-outline:hover { background: rgba(0, 230, 118, 0.1); }
    
    /* Section Common Styles */
    section { padding: 90px 0; }
    .section-title-wrap { text-align: center; max-width: 800px; margin: 0 auto 54px; }
    .badge { display: inline-block; padding: 4px 12px; font-size: 12px; font-weight: 700; text-transform: uppercase; border-radius: var(--radius-full); margin-bottom: 12px; letter-spacing: 0.5px; }
    .badge-dark { background: rgba(13, 27, 42, 0.08); color: var(--primary-dark); }
    .badge-green { background: rgba(0, 230, 118, 0.15); color: #00964b; }
    .section-title { font-size: 32px; font-weight: 800; color: var(--primary-dark); margin-bottom: 16px; line-height: 1.3; }
    .section-desc { font-size: 16px; color: var(--text-muted); line-height: 1.7; }
    
    /* 1. Hero Section (促销主视觉+角标+限时文案) */
    .hero-section { background: linear-gradient(135deg, #09121D 0%, #132238 60%, #0A1B2A 100%); color: #FFFFFF; padding: 90px 0 110px; position: relative; overflow: hidden; }
    .hero-section::before { content: ''; position: absolute; top: -100px; right: -100px; width: 500px; height: 500px; background: radial-gradient(circle, rgba(0,230,118,0.12) 0%, transparent 70%); border-radius: 50%; pointer-events: none; }
    .hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; align-items: center; position: relative; z-index: 2; }
    .hero-tag { display: inline-flex; align-items: center; gap: 8px; background: rgba(255, 109, 0, 0.2); border: 1px solid var(--accent-orange); color: #FF9E40; padding: 6px 14px; border-radius: var(--radius-full); font-size: 13px; font-weight: 700; margin-bottom: 24px; animation: bounce 2s infinite; }
    @keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-4px); } }
    .hero-h1 { font-size: 44px; font-weight: 900; line-height: 1.25; margin-bottom: 20px; letter-spacing: -1px; }
    .hero-h1 span { color: var(--accent-green); }
    .hero-intro { font-size: 16px; color: #CBD5E1; line-height: 1.8; margin-bottom: 32px; }
    .hero-btns { display: flex; gap: 16px; margin-bottom: 36px; }
    .promo-highlight-bar { display: flex; gap: 24px; background: rgba(255,255,255,0.06); padding: 14px 20px; border-radius: var(--radius-md); border: 1px solid rgba(255,255,255,0.1); }
    .promo-item { display: flex; flex-direction: column; }
    .promo-item strong { color: var(--accent-green); font-size: 18px; font-weight: 800; }
    .promo-item span { color: #94A3B8; font-size: 12px; }
    
    .hero-stage-card { background: rgba(27, 38, 59, 0.7); border: 1px solid rgba(255,255,255,0.15); border-radius: var(--radius-lg); padding: 24px; box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5); backdrop-filter: blur(8px); position: relative; }
    .hero-stage-card .badge-corner { position: absolute; top: -12px; right: 24px; background: var(--accent-orange); color: #FFF; font-weight: 800; font-size: 12px; padding: 4px 12px; border-radius: var(--radius-sm); box-shadow: 0 4px 10px rgba(255,109,0,0.4); }
    .hero-img-box { border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border-dark); margin-bottom: 16px; }
    .hero-stage-meta { display: flex; justify-content: space-between; align-items: center; color: #E2E8F0; font-size: 14px; }

    /* 2. Architecture Section */
    .arch-section { background: var(--bg-white); }
    .arch-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
    .arch-card { background: var(--bg-light); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 32px; box-shadow: var(--shadow-sm); }
    .arch-specs { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
    .arch-spec-item { background: var(--bg-white); padding: 16px; border-radius: var(--radius-md); border-left: 4px solid var(--accent-green); }
    .arch-spec-item h4 { font-size: 14px; color: var(--text-muted); margin-bottom: 4px; }
    .arch-spec-item p { font-size: 18px; font-weight: 800; color: var(--primary-dark); }

    /* 3. Core Advantages Grid (6 Cards) */
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
    .adv-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 30px; transition: transform 0.3s ease, box-shadow 0.3s ease; position: relative; }
    .adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(0, 230, 118, 0.4); }
    .adv-icon { width: 50px; height: 50px; background: rgba(13, 27, 42, 0.04); color: var(--primary-dark); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 22px; font-weight: 800; margin-bottom: 20px; }
    .adv-card h3 { font-size: 20px; font-weight: 700; color: var(--primary-dark); margin-bottom: 12px; }
    .adv-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

    /* 4. Product Editions */
    .edition-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-lg); padding: 36px 28px; display: flex; flex-direction: column; position: relative; transition: all 0.3s ease; }
    .edition-card.featured { border: 2px solid var(--accent-green); box-shadow: 0 16px 32px rgba(0,230,118,0.12); transform: scale(1.03); background: #FCFDFD; }
    .edition-badge { position: absolute; top: 16px; right: 20px; background: var(--accent-green); color: #000; font-size: 11px; font-weight: 800; padding: 3px 10px; border-radius: var(--radius-full); }
    .edition-name { font-size: 22px; font-weight: 800; color: var(--primary-dark); margin-bottom: 8px; }
    .edition-desc { font-size: 14px; color: var(--text-muted); margin-bottom: 24px; min-height: 48px; }
    .edition-price { font-size: 34px; font-weight: 900; color: var(--primary-dark); margin-bottom: 24px; }
    .edition-price small { font-size: 14px; font-weight: 400; color: var(--text-muted); }
    .edition-features { margin-bottom: 30px; flex-grow: 1; }
    .edition-features li { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--text-main); margin-bottom: 12px; }
    .edition-features li::before { content: '✓'; color: var(--accent-green); font-weight: 900; }

    /* 5. Dark Showcase Section */
    .dark-section { background-color: var(--bg-dark-section); color: #FFFFFF; }
    .dark-section .section-title { color: #FFFFFF; }
    .dark-section .section-desc { color: #94A3B8; }
    .showcase-container { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
    .showcase-content h3 { font-size: 26px; font-weight: 800; color: var(--accent-green); margin-bottom: 16px; }
    .showcase-content p { color: #CBD5E1; font-size: 15px; margin-bottom: 24px; line-height: 1.8; }
    .showcase-list { display: flex; flex-direction: column; gap: 16px; }
    .showcase-item { background: rgba(255,255,255,0.04); border: 1px solid var(--border-dark); border-radius: var(--radius-md); padding: 18px 20px; }
    .showcase-item h4 { font-size: 16px; color: #FFF; margin-bottom: 6px; }
    .showcase-item p { font-size: 13px; color: #94A3B8; margin-bottom: 0; }

    /* 6. User Scenarios */
    .scenario-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
    .scenario-card { background: var(--bg-white); border-radius: var(--radius-lg); border: 1px solid var(--border-color); padding: 32px; display: flex; flex-direction: column; }
    .scenario-header { display: flex; align-items: center; gap: 16px; margin-bottom: 20px; }
    .scenario-icon { width: 44px; height: 44px; background: rgba(255,109,0,0.1); color: var(--accent-orange); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-weight: 800; }
    .scenario-header h3 { font-size: 20px; font-weight: 700; color: var(--primary-dark); }
    .scenario-timeline { border-left: 2px dashed var(--border-color); padding-left: 20px; margin-left: 10px; margin-top: 10px; }
    .timeline-node { margin-bottom: 20px; position: relative; }
    .timeline-node::before { content: ''; position: absolute; left: -26px; top: 4px; width: 10px; height: 10px; border-radius: 50%; background: var(--primary-dark); border: 2px solid #FFF; }
    .timeline-node h4 { font-size: 15px; font-weight: 700; color: var(--primary-dark); }
    .timeline-node p { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

    /* 7. Metric Counters Bar */
    .metric-bar { background: linear-gradient(90deg, #0D1B2A 0%, #1B263B 100%); color: #FFF; padding: 60px 0; border-top: 1px solid var(--border-dark); border-bottom: 1px solid var(--border-dark); }
    .metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
    .metric-num { font-size: 42px; font-weight: 900; color: var(--accent-green); font-variant-numeric: tabular-nums; line-height: 1.1; margin-bottom: 8px; }
    .metric-label { font-size: 14px; color: #94A3B8; text-transform: uppercase; letter-spacing: 0.5px; }

    /* 8. Testimonials */
    .testi-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 30px; display: flex; flex-direction: column; justify-content: space-between; }
    .testi-rating { color: #FFB300; font-size: 18px; margin-bottom: 14px; }
    .testi-text { font-size: 14px; color: var(--text-main); line-height: 1.75; margin-bottom: 20px; }
    .testi-user { display: flex; align-items: center; gap: 14px; border-top: 1px solid var(--border-color); padding-top: 16px; }
    .testi-avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--secondary-dark); color: #FFF; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 14px; }
    .testi-info h4 { font-size: 15px; font-weight: 700; color: var(--primary-dark); }
    .testi-info span { font-size: 12px; color: var(--text-muted); }

    /* 9. News / Information Cards */
    .news-card { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-md); overflow: hidden; display: flex; flex-direction: column; }
    .news-thumb { height: 160px; position: relative; overflow: hidden; }
    .news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s ease; }
    .news-card:hover .news-thumb img { transform: scale(1.05); }
    .news-date { position: absolute; bottom: 10px; left: 10px; background: rgba(13,27,42,0.85); color: #FFF; font-size: 11px; padding: 2px 8px; border-radius: var(--radius-sm); }
    .news-body { padding: 20px; flex-grow: 1; display: flex; flex-direction: column; }
    .news-title { font-size: 16px; font-weight: 700; color: var(--primary-dark); margin-bottom: 10px; line-height: 1.4; }
    .news-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; flex-grow: 1; }
    .news-link { font-size: 13px; font-weight: 700; color: var(--accent-orange); align-self: flex-start; }

    /* 10. FAQ Accordion */
    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .faq-item { background: var(--bg-white); border: 1px solid var(--border-color); border-radius: var(--radius-md); overflow: hidden; }
    .faq-question { padding: 20px; font-size: 16px; font-weight: 700; color: var(--primary-dark); cursor: pointer; display: flex; justify-content: space-between; align-items: center; user-select: none; }
    .faq-question::after { content: '+'; font-size: 20px; color: var(--accent-orange); transition: transform 0.25s ease; }
    .faq-item.active .faq-question::after { content: '−'; transform: rotate(180deg); }
    .faq-answer { padding: 0 20px 20px; font-size: 14px; color: var(--text-muted); line-height: 1.7; display: none; }
    .faq-item.active .faq-answer { display: block; }

    /* 11. Security & Compliance Bar */
    .security-bar { background: #FFFFFF; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); padding: 50px 0; }
    .security-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
    .sec-card { display: flex; align-items: center; gap: 16px; }
    .sec-icon { width: 46px; height: 46px; background: rgba(0, 230, 118, 0.1); color: #00964b; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 900; font-size: 18px; flex-shrink: 0; }
    .sec-text h4 { font-size: 15px; font-weight: 700; color: var(--primary-dark); }
    .sec-text p { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

    /* 12. Bottom Conversion Form */
    .inquiry-section { background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-dark) 100%); color: #FFF; padding: 90px 0; }
    .inquiry-box { display: grid; grid-template-columns: 1fr 1.1fr; gap: 50px; align-items: center; }
    .inquiry-text h2 { font-size: 34px; font-weight: 800; margin-bottom: 18px; line-height: 1.3; }
    .inquiry-text p { font-size: 16px; color: #CBD5E1; line-height: 1.8; margin-bottom: 24px; }
    .inquiry-form { background: #FFFFFF; border-radius: var(--radius-lg); padding: 36px; box-shadow: 0 20px 40px rgba(0,0,0,0.25); color: var(--text-main); }
    .form-group { margin-bottom: 18px; }
    .form-group label { display: block; font-size: 13px; font-weight: 700; color: var(--primary-dark); margin-bottom: 6px; }
    .form-control { width: 100%; padding: 12px 14px; border: 1px solid var(--border-color); border-radius: var(--radius-sm); font-size: 14px; outline: none; transition: border-color 0.2s; }
    .form-control:focus { border-color: var(--accent-green); }

    /* Footer */
    .site-footer { background: #060B11; color: #64748B; font-size: 13px; padding: 70px 0 30px; border-top: 1px solid #142030; }
    .footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 50px; }
    .footer-brand h3 { font-size: 20px; font-weight: 800; color: #FFFFFF; margin-bottom: 16px; }
    .footer-brand p { line-height: 1.8; margin-bottom: 20px; }
    .footer-col h4 { font-size: 15px; font-weight: 700; color: #E2E8F0; margin-bottom: 18px; }
    .footer-col ul li { margin-bottom: 10px; }
    .footer-col ul li a:hover { color: var(--accent-green); }
    .footer-bottom { border-top: 1px solid #142030; padding-top: 30px; text-align: center; font-size: 12px; color: #475569; }

    /* Mobile Nav Toggle */
    .mobile-menu-btn { display: none; background: none; border: none; font-size: 24px; color: var(--primary-dark); cursor: pointer; }

    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .metric-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
      .hero-grid, .arch-grid, .showcase-container, .inquiry-box { grid-template-columns: 1fr; }
      .scenario-grid, .faq-grid, .security-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .top-bar { display: none; }
      .mobile-menu-btn { display: block; }
      .nav-links { display: none; position: absolute; top: 76px; left: 0; width: 100%; background: #FFF; flex-direction: column; padding: 24px; border-bottom: 1px solid var(--border-color); box-shadow: var(--shadow-md); }
      .nav-links.active { display: flex; }
      .hero-h1 { font-size: 30px; }
      .grid-3 { grid-template-columns: 1fr; }
      .edition-card.featured { transform: none; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-btns { flex-direction: column; }
    }