/* ===== RESET ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --primary: #ff3b4a;
      --primary-dark: #e02d3a;
      --primary-light: #fff0f1;
      --text: #111827;
      --text-muted: #6b7280;
      --text-light: #9ca3af;
      --bg: #ffffff;
      --bg-muted: #f9fafb;
      --border: #e5e7eb;
      --card-bg: #ffffff;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
      --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
      --radius: 16px;
      --radius-sm: 10px;
    }
    html { scroll-behavior: smooth; }
    body { font-family: 'Inter', sans-serif; color: var(--text); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
    img { display: block; max-width: 100%; }
    a { color: inherit; text-decoration: none; }
    p { line-height: 1.7; }

    /* ===== LAYOUT ===== */
    .container { max-width: 1100px; margin: 0 auto; padding: 0 1.25rem; }
    .container-narrow { max-width: 740px; }
    .section { padding: 5rem 0; }
    .section-muted { background: var(--bg-muted); }
    .section-header { text-align: center; margin-bottom: 3rem; }
    .section-header h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; color: var(--text); margin-bottom: 0.6rem; letter-spacing: -0.02em; line-height: 1.25; }
    .section-header p { color: var(--text-muted); font-size: 1.05rem; }
    .text-center { text-align: center; }
    .text-muted { color: var(--text-muted); }
    .mt-6 { margin-top: 1.5rem; }

    /* ===== NAVBAR ===== */
    .navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(255,255,255,0.92); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); transition: box-shadow 0.2s; }
    .navbar.scrolled { box-shadow: var(--shadow-sm); }
    .nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
    .logo { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; font-size: 1.05rem; color: var(--text); }
    .logo-icon { width: 34px; height: 34px; border-radius: 8px; overflow: hidden; display: flex; align-items: center; justify-content: center; background: var(--primary-light); }
    .logo-icon-sm { width: 28px; height: 28px; }
    .logo-mark { width: 100%; height: 100%; object-fit: contain; }

    /* ===== BUTTONS ===== */
    .btn { display: inline-flex; align-items: center; gap: 0.5rem; font-family: inherit; font-weight: 600; font-size: 0.95rem; border-radius: 10px; cursor: pointer; transition: all 0.18s ease; border: none; text-decoration: none; white-space: nowrap; }
    .btn-primary { background: var(--primary); color: #fff; padding: 0.55rem 1.1rem; }
    .btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(255,59,74,0.35); }
    .btn-white { background: #fff; color: var(--text); padding: 0.75rem 1.5rem; box-shadow: var(--shadow-sm); }
    .btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
    .btn-outline-white { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.5); padding: 0.75rem 1.5rem; }
    .btn-outline-white:hover { background: rgba(255,255,255,0.12); border-color: #fff; }
    .btn-sm { padding: 0.45rem 0.9rem; font-size: 0.875rem; }
    .btn-lg { padding: 0.85rem 1.8rem; font-size: 1rem; }
    .btn-block { width: 100%; justify-content: center; }
    @media (max-width: 480px) { .hide-mobile { display: none; } }

    /* ===== HERO ===== */
    .hero { padding: 7rem 0 4rem; }
    .hero-card { position: relative; overflow: hidden; background: linear-gradient(135deg, #ff3b4a 0%, #c0392b 100%); border-radius: 24px; padding: 3.5rem 2.5rem; color: #fff; margin-bottom: 2rem; }
    .hero-circle { position: absolute; border-radius: 50%; opacity: 0.12; pointer-events: none; }
    .hero-circle-1 { width: 380px; height: 380px; background: #fff; top: -120px; right: -80px; }
    .hero-circle-2 { width: 220px; height: 220px; background: #fff; bottom: -60px; left: -60px; }
    .hero-content { position: relative; z-index: 1; max-width: 620px; }
    .hero-badge { display: inline-flex; align-items: center; gap: 0.4rem; background: rgba(255,255,255,0.18); border: 1px solid rgba(255,255,255,0.3); border-radius: 50px; padding: 0.35rem 0.9rem; font-size: 0.82rem; font-weight: 600; margin-bottom: 1.2rem; }
    .hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 900; line-height: 1.15; margin-bottom: 1rem; letter-spacing: -0.03em; }
    .hero-subtitle { font-size: 1.05rem; opacity: 0.92; margin-bottom: 2rem; max-width: 520px; line-height: 1.65; }
    .hero-buttons { display: flex; gap: 0.75rem; flex-wrap: wrap; }

    /* ===== STATS ===== */
    .stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
    .stat-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 1.25rem 1rem; text-align: center; box-shadow: var(--shadow-sm); }
    .stat-icon { color: var(--primary); margin: 0 auto 0.5rem; }
    .stat-value { font-size: 1.6rem; font-weight: 900; color: var(--text); line-height: 1; margin-bottom: 0.2rem; }
    .stat-label { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.04em; }

    /* ===== FEATURES ===== */
    .features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 1.25rem; }
    .feature-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.75rem 1.5rem; box-shadow: var(--shadow-sm); transition: transform 0.2s, box-shadow 0.2s; }
    .feature-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
    .feature-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; margin-bottom: 1rem; flex-shrink: 0; }
    .feature-icon-red { background: #fff0f1; color: #ff3b4a; }
    .feature-icon-blue { background: #eff6ff; color: #3b82f6; }
    .feature-icon-yellow { background: #fffbeb; color: #f59e0b; }
    .feature-icon-green { background: #f0fdf4; color: #22c55e; }
    .feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--text); }
    .feature-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

    /* ===== INFO TABLE ===== */
    .info-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
    .info-table tr { border-bottom: 1px solid var(--border); }
    .info-table tr:last-child { border-bottom: none; }
    .info-table td { padding: 0.55rem 0; vertical-align: top; }
    .info-table td:first-child { color: var(--text-muted); width: 55%; }
    .info-table td:last-child { font-weight: 600; color: var(--text); }

    /* ===== DEMO ===== */
    .demo-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 2rem; box-shadow: var(--shadow-sm); min-height: 180px; }
    .demo-counter { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 0.75rem; font-weight: 500; }
    .demo-question { font-size: 1.05rem; font-weight: 600; margin-bottom: 1.25rem; color: var(--text); line-height: 1.5; }
    .demo-options { display: flex; flex-direction: column; gap: 0.6rem; }
    .demo-option { background: var(--bg-muted); border: 2px solid var(--border); border-radius: 10px; padding: 0.75rem 1rem; cursor: pointer; font-size: 0.95rem; transition: all 0.15s; font-family: inherit; text-align: left; color: var(--text); }
    .demo-option:hover { border-color: var(--primary); background: var(--primary-light); }
    .demo-option.correct { border-color: #22c55e; background: #f0fdf4; color: #15803d; }
    .demo-option.wrong { border-color: #ef4444; background: #fef2f2; color: #b91c1c; }
    .demo-feedback { margin-top: 1rem; padding: 0.75rem 1rem; border-radius: 8px; font-size: 0.9rem; font-weight: 500; line-height: 1.55; }
    .demo-feedback.correct { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }
    .demo-feedback.wrong { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }
    .demo-next { margin-top: 1rem; }
    #demo-next-btn { width: 100%; justify-content: center; white-space: normal; text-align: center; line-height: 1.35; }
    #guide-download-btn { justify-content: center; text-align: center; }

    /* ===== SIGNS ===== */
    .signs-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1rem; }
    .sign-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 1rem 0.75rem; text-align: center; box-shadow: var(--shadow-sm); }
    .sign-image-wrap { width: 88px; height: 88px; margin: 0 auto 0.55rem; display: flex; align-items: center; justify-content: center; }
    .sign-image { width: 88px; height: 88px; object-fit: contain; }
    .sign-name { font-size: 0.75rem; font-weight: 600; color: var(--text); line-height: 1.3; }
    .sign-type { font-size: 0.68rem; color: var(--text-muted); margin-top: 0.2rem; text-transform: uppercase; letter-spacing: 0.04em; }

    /* ===== GUIDE ===== */
    .guide-list { display: flex; flex-direction: column; gap: 1rem; }
    .guide-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 1.25rem 1.5rem; display: flex; gap: 1.25rem; align-items: flex-start; box-shadow: var(--shadow-sm); }
    .guide-label { background: var(--primary); color: #fff; font-size: 0.72rem; font-weight: 700; padding: 0.25rem 0.55rem; border-radius: 6px; white-space: nowrap; flex-shrink: 0; letter-spacing: 0.04em; margin-top: 2px; }
    .guide-body { flex: 1; }
    .guide-body h4 { font-size: 0.97rem; font-weight: 700; color: var(--text); margin-bottom: 0.4rem; line-height: 1.4; }
    .guide-body p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; }
    .guide-topic { font-size: 0.72rem; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.4rem; display: block; }
    .guide-card-block { flex-direction: column; gap: 0.85rem; }

    /* ===== SCREENSHOTS ===== */
    .screenshots-scroll { display: flex; gap: 1rem; overflow-x: auto; padding-bottom: 1rem; scrollbar-width: thin; scrollbar-color: var(--border) transparent; -webkit-overflow-scrolling: touch; }
    .screenshots-scroll::-webkit-scrollbar { height: 4px; }
    .screenshots-scroll::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
    .screenshot-placeholder { flex-shrink: 0; width: 200px; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow-sm); background: var(--bg-muted); }
    .screenshot-image { width: 100%; height: auto; display: block; }

    /* ===== TESTIMONIALS ===== */
    .testimonials-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.25rem; }
    .testimonial-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow-sm); }
    .stars { color: #f59e0b; font-size: 1rem; margin-bottom: 0.75rem; letter-spacing: 2px; }
    .testimonial-card p { font-size: 0.92rem; color: var(--text); font-style: italic; margin-bottom: 1rem; line-height: 1.65; }
    .testimonial-author { display: flex; flex-direction: column; gap: 0.15rem; }
    .testimonial-author strong { font-size: 0.9rem; color: var(--text); }
    .testimonial-author span { font-size: 0.82rem; color: var(--text-muted); }

    /* ===== FAQ ===== */
    .faq-list { display: flex; flex-direction: column; }
    .faq-item { border-bottom: 1px solid var(--border); cursor: pointer; }
    .faq-item:first-child { border-top: 1px solid var(--border); }
    .faq-question { font-weight: 600; font-size: 0.97rem; display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 1.1rem 0; color: var(--text); line-height: 1.4; }
    .faq-icon { flex-shrink: 0; width: 24px; height: 24px; background: var(--bg-muted); border: 1px solid var(--border); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; color: var(--primary); transition: transform 0.2s; font-weight: 400; line-height: 1; }
    .faq-item.open .faq-icon { transform: rotate(45deg); }
    .faq-answer { display: none; padding-bottom: 1.1rem; font-size: 0.92rem; color: var(--text-muted); line-height: 1.7; }
    .faq-item.open .faq-answer { display: block; }
    .faq-answer strong { color: var(--text); }

    /* ===== CTA ===== */
    .cta-card { position: relative; overflow: hidden; background: linear-gradient(135deg, #ff3b4a 0%, #c0392b 100%); border-radius: 24px; padding: 3.5rem 2.5rem; color: #fff; text-align: center; }
    .cta-content { position: relative; z-index: 1; }
    .cta-card h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); font-weight: 900; margin-bottom: 0.75rem; letter-spacing: -0.02em; }
    .cta-card p { font-size: 1rem; opacity: 0.9; margin-bottom: 2rem; max-width: 500px; margin-left: auto; margin-right: auto; line-height: 1.65; }
    .cta-buttons { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

    /* ===== STICKY ===== */
    .sticky-download { position: fixed; bottom: 0; left: 0; right: 0; z-index: 90; background: var(--bg); border-top: 1px solid var(--border); padding: 0.75rem 1.25rem; display: none; box-shadow: 0 -4px 16px rgba(0,0,0,0.08); }
    @media (max-width: 640px) { .sticky-download { display: block; } }

    /* ===== MODAL ===== */
    .modal-overlay { position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,0.5); backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center; padding: 1.25rem; opacity: 0; pointer-events: none; transition: opacity 0.2s; }
    .modal-overlay.visible { opacity: 1; pointer-events: auto; }
    .modal-card { background: var(--card-bg); border-radius: var(--radius); padding: 2rem; text-align: center; max-width: 380px; width: 100%; box-shadow: var(--shadow-lg); }
    .modal-icon { width: 56px; height: 56px; background: var(--primary-light); border-radius: 14px; display: flex; align-items: center; justify-content: center; margin: 0 auto 1rem; color: var(--primary); }
    .modal-card h3 { font-size: 1.2rem; font-weight: 800; margin-bottom: 0.5rem; }
    .modal-card p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 1.5rem; line-height: 1.6; }
    .modal-dismiss { background: none; border: none; color: var(--text-muted); font-size: 0.875rem; cursor: pointer; margin-top: 0.75rem; font-family: inherit; text-decoration: underline; display: block; width: 100%; text-align: center; }
    .modal-dismiss:hover { color: var(--text); }

    /* ===== FOOTER ===== */
    .footer { background: var(--bg-muted); border-top: 1px solid var(--border); padding: 3rem 0 1.5rem; }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 2.5rem; margin-bottom: 2rem; }
    .footer-grid-3 { grid-template-columns: 2fr 1fr 1fr; }
    @media (min-width: 769px) {
      .footer-grid > .footer-col:last-child { justify-self: end; }
    }
    .footer-brand-col .logo { margin-bottom: 0.75rem; }
    .footer-desc { font-size: 0.87rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 0.5rem; }
    .footer-disclaimer { font-size: 0.78rem; color: var(--text-light); line-height: 1.5; }
    .footer-disclaimer a { text-decoration: underline; }
    .footer-title { font-size: 0.82rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text); margin-bottom: 0.75rem; margin-top: 1.5rem; }
    .footer-title:first-child { margin-top: 0; }
    .footer-links { display: flex; flex-direction: column; gap: 0.4rem; }
    .footer-links a { font-size: 0.87rem; color: var(--text-muted); transition: color 0.15s; }
    .footer-links a:hover { color: var(--primary); }
    .footer-divider { border: none; border-top: 1px solid var(--border); margin-bottom: 1.25rem; }
    .footer-copy { font-size: 0.82rem; color: var(--text-light); text-align: center; }

    /* ===== RESPONSIVE ===== */
    @media (max-width: 768px) {
      .section { padding: 3.5rem 0; }
      .hero { padding: 5.5rem 0 3rem; }
      .hero-card { padding: 2.5rem 1.5rem; }
      .hero h1 { font-size: 1.9rem; }
      .stats-row { gap: 0.75rem; }
      .stat-value { font-size: 1.3rem; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid-3 { grid-template-columns: 1fr 1fr; }
      .footer-brand-col { grid-column: 1 / -1; }
      .cta-card { padding: 2.5rem 1.5rem; }
      .guide-card { flex-direction: column; gap: 0.75rem; }
    }
    @media (max-width: 480px) {
      .features-grid { grid-template-columns: 1fr; }
      .stats-row { gap: 0.5rem; }
      .stat-card { padding: 1rem 0.5rem; }
      .hero-buttons { flex-direction: column; }
      .hero-buttons .btn { width: 100%; justify-content: center; }
      .cta-buttons { flex-direction: column; align-items: center; }
      .cta-buttons .btn { width: 100%; justify-content: center; }
      .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
      .footer-grid-3 { grid-template-columns: 1fr; }
      .signs-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
      .testimonials-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 420px) {
      .signs-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      #guide-download-btn { width: 100%; white-space: normal; line-height: 1.35; }
    }