:root{color-scheme:dark light;--bg-page: #0b1120;--bg-card: #1e293b;--border: #334155;--border-control: #7c8ba1;--text-main: #f8fafc;--text-muted: #94a3b8;--accent: #38bdf8;--accent-glow: rgba(56, 189, 248, .15);--on-accent: #0b1120;--success: #34d399;--error: #fca5a5;--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}@media(prefers-color-scheme:light){:root{--bg-page: #f8fafc;--bg-card: #ffffff;--border: #e2e8f0;--border-control: #64748b;--text-main: #0f172a;--text-muted: #5b6b82;--accent: #0369a1;--accent-glow: rgba(3, 105, 161, .1);--on-accent: #ffffff;--success: #065f46;--error: #b91c1c}}*{box-sizing:border-box;margin:0;padding:0}a:focus-visible,button:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}body{background-color:var(--bg-page);color:var(--text-main);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}header.navbar{border-bottom:1px solid var(--border);padding:1rem 1.5rem;background:var(--bg-card)}.nav-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.brand{font-size:1.25rem;font-weight:700;color:var(--text-main);text-decoration:none;display:flex;align-items:center;gap:.5rem}.brand-badge{font-size:.75rem;padding:.2rem .5rem;border-radius:999px;background:var(--accent-glow);color:var(--accent);border:1px solid var(--accent)}.privacy-badge{font-size:.85rem;color:var(--text-muted)}main.container{max-width:1200px;margin:2rem auto;padding:0 1.5rem;flex:1;width:100%}.hero{text-align:center;margin-bottom:2rem}.hero h1{font-size:clamp(2rem,5vw,2.75rem);font-weight:800;margin-bottom:.5rem}.hero p{color:var(--text-muted);font-size:1.1rem}.grid-workspace{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}@media(max-width:768px){.grid-workspace{grid-template-columns:1fr}}.pane{background:var(--bg-card);border:1px solid var(--border);border-radius:14px;padding:1.25rem;display:flex;flex-direction:column;gap:.75rem}.pane-header{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.5rem}.pane-title{font-size:.95rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}textarea.editor{width:100%;min-height:380px;padding:1rem;background:var(--bg-page);border:1px solid var(--border-control);border-radius:10px;color:var(--text-main);font-family:var(--font-mono);font-size:.95rem;line-height:1.5;resize:vertical}textarea.editor::placeholder{color:var(--text-muted);opacity:1}textarea.editor:focus{border-color:var(--accent)}.pane-actions{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}.json-stats{font-size:.85rem;color:var(--text-muted);font-family:var(--font-mono)}button.btn{padding:.45rem .9rem;border:1px solid var(--border);background:var(--bg-page);color:var(--text-main);border-radius:8px;cursor:pointer;font-weight:600;font-size:.85rem}button.btn:hover{border-color:var(--text-muted)}button.btn:disabled{opacity:.5;cursor:not-allowed;border-color:var(--border)}button.btn-primary{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}button.btn-primary:hover{filter:brightness(1.1)}.status-badge{font-size:.85rem;font-weight:700;padding:.2rem .6rem;border-radius:6px}.status-valid{background:#34d39926;color:var(--success);border:1px solid var(--success)}.status-invalid{background:#f8717126;color:var(--error);border:1px solid var(--error)}.faq{max-width:70ch;margin:3rem auto 0}.faq h2{font-size:1.5rem;font-weight:800;margin-bottom:1rem}.faq h3{font-size:1.05rem;font-weight:700;margin-top:1.5rem;margin-bottom:.25rem}.faq code{font-family:var(--font-mono);font-size:.9em}footer.footer{border-top:1px solid var(--border);padding:2rem 1.5rem;text-align:center;color:var(--text-muted);font-size:.9rem;background:var(--bg-card)}footer a{color:var(--accent);text-decoration:underline}