:root {
  --bg: #0b0d12;
  --card: #121626;
  --border: rgba(255,255,255,.08);
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.65);
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial; }
a { color: inherit; text-decoration: none; }
code { background: rgba(255,255,255,.06); padding: .1rem .3rem; border-radius: .4rem; border: 1px solid var(--border); }

.container { max-width: 980px; margin: 0 auto; padding: 22px; }
.header { display:flex; align-items:flex-start; justify-content:space-between; gap: 16px; }
h1 { margin: 0 0 6px; font-size: 28px; letter-spacing: .2px; }
h2 { margin: 0 0 6px; font-size: 18px; }
p { margin: 8px 0; }
.muted { color: var(--muted); }
.error { color: #ff6b6b; margin: 8px 0 0; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 16px; box-shadow: var(--shadow); display:flex; flex-direction:column; gap: 12px; }
.cardHead { flex: 1; }
.cardActions { display:flex; gap: 10px; flex-wrap: wrap; }

.btn { background: rgba(255,255,255,.10); border: 1px solid var(--border); color: var(--text); padding: 10px 12px; border-radius: 12px; cursor: pointer; transition: transform .06s ease, background .15s ease; }
.btn:hover { background: rgba(255,255,255,.14); }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: transparent; }

.panel { margin-top: 16px; background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 16px; box-shadow: var(--shadow); }
.pre { white-space: pre-wrap; word-break: break-word; background: rgba(0,0,0,.2); border: 1px solid var(--border); border-radius: 12px; padding: 12px; }
.stack { display:flex; flex-direction:column; gap: 12px; margin-top: 12px; }
.row { display:flex; gap: 10px; align-items:center; margin-top: 10px; }
.row.space { justify-content: space-between; }
.tabs { display:flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
.tab-btn.active { background: rgba(255,255,255,.2); border-color: rgba(255,255,255,.24); }