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12px;font-size:20px;display:grid}.demo-modal-header h3{margin:0 0 6px;font-size:1.2rem}.demo-modal-header p{color:#64748b;margin:0;font-size:12px}.demo-modal-form{gap:14px;display:grid}.demo-modal-form label{color:#334155;margin-bottom:4px;font-size:12px;font-weight:700;display:block}.demo-modal-form input{width:100%;font:inherit;border:1px solid #cbd5e1;border-radius:12px;padding:10px 14px;font-size:14px}.demo-modal-form input:focus{border-color:var(--primary);box-shadow:0 0 0 1px var(--primary);outline:none}.demo-modal-submit{width:100%;margin-top:4px}.demo-modal-submit:disabled{opacity:.7;cursor:not-allowed;transform:none}.demo-modal-error{color:#b91c1c;background:#fef2f2;border:1px solid #fecaca;border-radius:10px;margin:0;padding:10px 12px;font-size:12px;line-height:1.4}.demo-modal-success{text-align:center}.demo-modal-success-icon{color:#059669;background:#ecfdf5;border-radius:999px;place-items:center;width:64px;height:64px;margin:0 auto 12px;font-size:28px;display:grid}.demo-modal-success h4{margin:0 0 8px;font-size:1.1rem}.demo-modal-success p{color:#475569;margin:0 0 16px;font-size:12px}.demo-modal-done{color:#fff;background:#0f172a;border:none;border-radius:12px;padding:8px 20px;font-size:12px;font-weight:600}.floating-contact{z-index:80;flex-direction:column;gap:12px;display:flex;position:fixed;bottom:24px;right:20px}.floating-contact-btn{color:#fff;border:none;border-radius:999px;place-items:center;width:52px;height:52px;font-size:22px;transition:transform .15s,box-shadow .15s;display:grid;box-shadow:0 10px 24px #0f172a38}.floating-contact-btn:hover{transform:translateY(-2px);box-shadow:0 14px 28px #0f172a47}.floating-contact-btn--fb{background:#1877f2}.floating-contact-btn--zalo{background:#0068ff}@media (width<=768px){.floating-contact{bottom:16px;right:14px}.floating-contact-btn{width:48px;height:48px;font-size:20px}}:root{--background:#f8fafc;--surface:#fff;--sidebar:#0f172a;--primary:#2563eb;--primary-dark:#1d4ed8;--primary-light:#eff6ff;--emerald:#10b981;--emerald-light:#ecfdf5;--amber:#d97706;--amber-light:#fffbeb;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--border:#e2e8f0;--border-light:#f1f5f9;--shadow-sm:0 1px 2px #0f172a0f;--shadow-md:0 10px 28px #0f172a1a;--shadow-lg:0 24px 56px #0f172a33;--shadow-glow:0 0 28px #2563eb3d;--radius:16px;--radius-sm:12px;--container:1120px}*,:before,:after{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--text-primary);background:var(--background);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.6}::selection{background:var(--primary);color:#fff}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}.page{min-height:100vh}.container{width:min(var(--container), calc(100% - 48px));margin-inline:auto}.section{padding:96px 0}.section-header{max-width:640px;margin-bottom:48px}.section-header--center{text-align:center;max-width:720px;margin-inline:auto}.section-label{background:var(--primary-light);color:var(--primary);letter-spacing:.08em;text-transform:uppercase;border-radius:999px;margin-bottom:12px;padding:6px 12px;font-size:11px;font-weight:700;display:inline-block}.section-title{letter-spacing:-.02em;margin:0 0 16px;font-size:clamp(1.75rem,3vw,2.25rem);line-height:1.15}.section-desc{color:var(--text-secondary);margin:0;font-size:1.05rem}.btn{border-radius:var(--radius-sm);border:none;justify-content:center;align-items:center;gap:8px;padding:14px 22px;font-size:14px;font-weight:600;transition:transform .15s,box-shadow .15s,background .15s;display:inline-flex}.btn:hover{transform:translateY(-1px)}.btn-primary{background:linear-gradient(90deg, var(--primary) 0%, var(--emerald) 100%);color:#fff;box-shadow:0 10px 24px #2563eb40}.btn-primary:hover{box-shadow:var(--shadow-glow)}.features{background:#fff}.btn-secondary{color:#e2e8f0;background:#0f172acc;border:1px solid #334155e6}.btn-secondary:hover{background:#1e293bf2}@media (width<=768px){.section{padding:72px 0}.container{width:min(var(--container), calc(100% - 32px))}}