:root{color-scheme:dark;--bg: #0f172a;--surface: #1e293b;--border: #334155;--text: #f8fafc;--muted: #94a3b8;--accent: #38bdf8;--danger: #f87171;--ok: #4ade80;--safe-bottom: env(safe-area-inset-bottom, 0px);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.45}*{box-sizing:border-box}body{margin:0;min-height:100dvh;background:var(--bg);color:var(--text)}#root{min-height:100dvh}a{color:var(--accent)}button{font:inherit;cursor:pointer}input,select,textarea{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.5rem .65rem}.page{padding:1rem;padding-bottom:calc(5.5rem + var(--safe-bottom));max-width:720px;margin:0 auto}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:.85rem 1rem;margin-bottom:.75rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.35rem;border:none;border-radius:10px;padding:.6rem 1rem;font-weight:600}.btn-primary{background:var(--accent);color:#0f172a}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--border)}.btn-danger{background:#7f1d1d;color:#fecaca}.muted{color:var(--muted);font-size:.875rem}.row{display:flex;align-items:flex-start;gap:.5rem}.stack{display:flex;flex-direction:column;gap:.35rem}.tabs{position:fixed;left:0;right:0;bottom:0;display:flex;justify-content:space-around;gap:.25rem;padding:.35rem .5rem calc(.5rem + var(--safe-bottom));background:#0f172af2;border-top:1px solid var(--border);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:50}.tabs a{flex:1;text-align:center;text-decoration:none;color:var(--muted);font-size:.7rem;padding:.35rem .15rem;border-radius:8px}.tabs a.active{color:var(--accent);background:#38bdf81f}h1{font-size:1.25rem;margin:0 0 .75rem}h2{font-size:1rem;margin:0 0 .5rem}.pre-wrap{white-space:pre-wrap;word-break:break-word}.study-card{border:1px solid var(--border);border-radius:10px;padding:.75rem .85rem;background:#0f172a80}.study-card-title{font-size:1rem;margin:0 0 .5rem;display:flex;align-items:center;gap:.35rem}.study-toolbar select,.study-toolbar input[type=number]{width:100%;max-width:11rem}.tech-picker{flex:1 1 140px;min-width:0;border:1px solid var(--border);border-radius:8px;background:var(--bg)}.tech-picker>summary{list-style:none;cursor:pointer;padding:.45rem .6rem;font-size:.82rem;color:var(--muted)}.tech-picker>summary::-webkit-details-marker{display:none}.tech-picker[open]>summary{color:var(--accent);border-bottom:1px solid var(--border)}.tech-picker-list{padding:.35rem .5rem .5rem;display:flex;flex-direction:column;gap:.25rem}.tech-picker-item{display:flex;align-items:center;gap:.45rem;font-size:.85rem;cursor:pointer}.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:.75rem;margin-top:1rem}.stat-card{border:1px solid var(--border);border-radius:12px;padding:.85rem 1rem;background:var(--surface);min-height:5.5rem;transition:border-color .15s ease}a .stat-card:hover{border-color:var(--accent)}