:root{--bg: #0b1020;--bg-glow-a: rgba(99, 102, 241, .18);--bg-glow-b: rgba(14, 165, 233, .14);--surface: rgba(19, 26, 46, .72);--surface-solid: #131a2e;--surface-raised: rgba(255, 255, 255, .04);--surface-hover: rgba(255, 255, 255, .08);--sidebar-bg: rgba(11, 16, 32, .55);--input-bg: rgba(8, 12, 24, .6);--border: rgba(148, 163, 184, .16);--border-strong: rgba(148, 163, 184, .28);--text: #e8ecf6;--text-muted: #94a3b8;--accent: #6366f1;--accent-hover: #7c7ff5;--accent-soft: rgba(99, 102, 241, .14);--danger: #f87171;--success: #34d399;--radius: 14px;--radius-sm: 10px;--shadow: 0 18px 40px -22px rgba(0, 0, 0, .9);color-scheme:dark;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}:root[data-theme=light]{--bg: #f4f6fb;--bg-glow-a: rgba(99, 102, 241, .14);--bg-glow-b: rgba(14, 165, 233, .12);--surface: rgba(255, 255, 255, .82);--surface-solid: #ffffff;--surface-raised: rgba(15, 23, 42, .05);--surface-hover: rgba(15, 23, 42, .09);--sidebar-bg: rgba(255, 255, 255, .72);--input-bg: rgba(255, 255, 255, .9);--border: rgba(15, 23, 42, .1);--border-strong: rgba(15, 23, 42, .18);--text: #0f172a;--text-muted: #64748b;--accent: #4f46e5;--accent-hover: #4338ca;--accent-soft: rgba(79, 70, 229, .1);--danger: #dc2626;--success: #059669;--shadow: 0 18px 40px -26px rgba(15, 23, 42, .4);color-scheme:light;-webkit-font-smoothing:auto}*{box-sizing:border-box}html,body,#root{min-height:100%}body{margin:0;color:var(--text);background-color:var(--bg);background-image:radial-gradient(1000px 600px at 12% -10%,var(--bg-glow-a),transparent 60%),radial-gradient(900px 600px at 100% 0%,var(--bg-glow-b),transparent 55%);background-attachment:fixed}.shell{display:grid;grid-template-columns:250px minmax(0,1fr);min-height:100vh}.sidebar{display:flex;flex-direction:column;gap:1.75rem;padding:1.75rem 1.25rem;border-right:1px solid var(--border);background:var(--sidebar-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.brand{display:flex;align-items:center;gap:.75rem}.brand-mark{display:grid;place-items:center;width:38px;height:38px;flex:none;border-radius:11px;background:linear-gradient(140deg,var(--accent),#22d3ee);box-shadow:0 10px 26px -12px var(--accent);color:#fff}.brand-name{margin:0;font-size:1rem;font-weight:650;letter-spacing:-.01em}.brand-tag{margin:.1rem 0 0;font-size:.75rem;color:var(--text-muted)}.nav{display:flex;flex-direction:column;gap:.3rem}.nav-label{padding:0 .6rem;margin-bottom:.5rem;font-size:.68rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--text-muted)}.nav-item{display:flex;align-items:center;gap:.65rem;width:100%;padding:.62rem .7rem;border:1px solid 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ease}.theme-toggle:hover{color:var(--text);border-color:var(--border-strong)}.theme-toggle:focus-visible{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.theme-toggle svg{flex:none}.content{min-width:0;padding:clamp(1.75rem,4vw,3rem) clamp(1rem,4vw,2.5rem) 4rem}.content-inner{width:100%;max-width:780px;margin:0 auto}@media(max-width:760px){.shell{grid-template-columns:minmax(0,1fr)}.sidebar{gap:1.25rem;border-right:none;border-bottom:1px solid var(--border)}.nav{flex-direction:row;flex-wrap:wrap}.nav-label{display:none}.sidebar-footer{flex-direction:row;align-items:center;justify-content:space-between;margin-top:0}.theme-toggle,.nav-item{width:auto}}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:clamp(1.25rem,3vw,1.75rem);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.card+.card{margin-top:1.5rem}.card-header{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin-bottom:1.25rem}.card-title{margin:0;font-size:1.05rem;font-weight:620;letter-spacing:-.01em}.card-hint{margin:.3rem 0 0;font-size:.82rem;color:var(--text-muted)}.badge{flex:none;padding:.25rem .6rem;border-radius:999px;border:1px solid var(--border-strong);background:var(--surface-raised);font-family:ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,monospace;font-size:.72rem;color:var(--text-muted);white-space:nowrap}.field{margin-bottom:1rem}.label{display:block;margin-bottom:.45rem;font-size:.8rem;font-weight:550;letter-spacing:.01em;color:var(--text-muted)}.input,.output{width:100%;padding:.7rem .85rem;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--input-bg);color:var(--text);font-size:.92rem;font-family:inherit;transition:border-color .15s ease,box-shadow .15s ease}.input:focus,.output:focus,.file-drop:focus-within{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.output{resize:vertical;min-height:7rem;font-family:ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,monospace;font-size:.83rem;line-height:1.55;color:var(--text-muted)}.output.is-error{color:var(--danger);border-color:#f8717166}.file-drop{position:relative;display:flex;align-items:center;gap:.85rem;padding:1rem;border:1px dashed var(--border-strong);border-radius:var(--radius-sm);background:var(--input-bg);cursor:pointer;transition:border-color .15s ease,background .15s ease}.file-drop:hover{border-color:var(--accent);background:var(--accent-soft)}.file-drop 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ease}.btn:hover:not(:disabled){background:var(--accent-hover)}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-ghost{background:var(--surface-raised);border-color:var(--border-strong);color:var(--text);text-decoration:none}.btn-ghost:hover:not(:disabled){background:var(--surface-hover)}.spinner{width:14px;height:14px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes 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