:root {
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  color: #17201d;
  background: #edf2ef;
  font-synthesis: none;
  --ink: #17201d;
  --muted: #5f6f68;
  --line: #c9d4ce;
  --paper: #ffffff;
  --brand: #165f48;
  --action: #165f48;
  --action-text: #ffffff;
  --danger: #9b332d;
  --danger-action: #9b332d;
  --focus: #2d6cdf;
  --soft: #e1eee8;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
header, main { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
header { display: flex; justify-content: space-between; gap: 24px; align-items: end; padding: 48px 0 28px; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 8px; font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -0.045em; }
h2 { margin-bottom: 0; }
.eyebrow { color: var(--brand); font-size: .78rem; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.header-actions, .cell-toolbar, .cell-footer, .notebook-heading, .notebook-actions, .recovery-actions { display: flex; gap: 10px; align-items: center; }
.header-actions { flex-wrap: wrap; justify-content: flex-end; }
button, input, select, textarea { font: inherit; }
button { border: 1px solid var(--action); border-radius: 8px; padding: 10px 14px; color: var(--action-text); background: var(--action); cursor: pointer; }
button.secondary { color: var(--brand); background: transparent; }
button.danger { border-color: var(--danger-action); background: var(--danger-action); color: #fff; }
button.compact { padding: 6px 9px; font-size: .78rem; }
button:disabled { cursor: not-allowed; opacity: .48; }
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 8px 28px rgb(23 32 29 / 6%); }
.intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; padding: 22px; }
label { display: grid; gap: 7px; font-size: .84rem; font-weight: 700; }
input, select { border: 1px solid var(--line); border-radius: 7px; padding: 9px 10px; background: var(--paper); color: var(--ink); }
.muted, .cell-footer, .runtime-strip p { color: var(--muted); font-size: .82rem; }
.file-list { min-width: 0; margin: 10px 0; padding-left: 20px; overflow-wrap: anywhere; }
.runtime-strip { display: grid; grid-template-columns: minmax(220px, auto) minmax(180px, auto) 1fr; gap: 16px; align-items: center; margin: 18px 0 34px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--soft); }
.runtime-card { display: flex; gap: 14px; align-items: center; justify-content: space-between; padding-right: 16px; border-right: 1px solid var(--line); }
.runtime-card > div { display: flex; flex-direction: column; gap: 3px; }
.runtime-card button { padding: 7px 10px; white-space: nowrap; }
.runtime-status { color: var(--muted); font-size: .72rem; overflow-wrap: anywhere; }
.runtime-status[data-state="ready"] { color: var(--brand); font-weight: 750; }
.runtime-status[data-state="error"] { color: var(--danger); font-weight: 700; }
.runtime-strip p { margin: 0; }
.notebook-heading { justify-content: space-between; margin-bottom: 14px; }
.notebook-actions { flex-wrap: wrap; justify-content: flex-end; }
.cells { display: grid; gap: 16px; padding-bottom: 60px; }
.cell-toolbar { justify-content: space-between; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.cell-toolbar label { margin-left: auto; display: flex; align-items: center; }
.cell-code { display: block; width: 100%; min-height: 170px; padding: 18px; resize: vertical; border: 0; color: #d7efe4; background: #17251f; font-family: "Cascadia Code", Consolas, monospace; line-height: 1.55; tab-size: 2; }
.cell-code:focus-visible { outline: 0; box-shadow: inset 0 0 0 3px var(--focus); }
.cell-code:disabled { opacity: .78; }
.cell-footer { padding: 10px 14px; }
.cell-status { overflow-wrap: anywhere; }
.cell-output { padding: 0 14px 14px; border-top: 1px solid var(--line); }
.cell-output[data-stale="true"] { border-left: 5px solid #bf7b12; opacity: .82; }
.output-heading { display: flex; justify-content: space-between; gap: 14px; align-items: baseline; padding: 12px 0 8px; }
.output-meta { color: var(--muted); font-size: .74rem; text-align: right; overflow-wrap: anywhere; }
.output-block { margin-top: 8px; }
.output-block > span { display: block; margin-bottom: 4px; color: var(--muted); font-size: .68rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.output-block pre { max-height: 360px; margin: 0; overflow: auto; padding: 12px; border-radius: 7px; color: #d7efe4; background: #17251f; font: .84rem/1.5 "Cascadia Code", Consolas, monospace; white-space: pre-wrap; overflow-wrap: anywhere; }
.output-error pre, .output-stderr pre { color: #ffe0dc; background: #432521; }
.output-empty { margin: 4px 0 0; color: var(--muted); font-size: .82rem; }
.output-inputs { margin-top: 10px; color: var(--muted); font-size: .76rem; }
.output-inputs summary { cursor: pointer; }
.output-inputs ul { padding-left: 20px; overflow-wrap: anywhere; }

@media (max-width: 760px) {
  header { align-items: stretch; flex-direction: column; padding-top: 28px; }
  .header-actions button { flex: 1; }
  .intro-grid { grid-template-columns: 1fr; }
  .runtime-strip { grid-template-columns: 1fr 1fr; }
  .runtime-strip p { grid-column: 1 / -1; }
  .runtime-card { align-items: stretch; flex-direction: column; }
  .notebook-heading { align-items: stretch; flex-direction: column; }
  .notebook-actions { justify-content: stretch; }
  .notebook-actions button { flex: 1 1 150px; }
  .cell-toolbar { align-items: stretch; flex-wrap: wrap; }
  .cell-toolbar label { order: 2; width: 100%; margin-left: 0; }
  .output-heading { align-items: flex-start; flex-direction: column; gap: 3px; }
  .output-meta { text-align: left; }
}

@media (prefers-color-scheme: dark) {
  :root { --ink: #e5eee9; --muted: #b8c8c0; --line: #52645b; --paper: #202c27; --soft: #263a32; --brand: #83e2be; --action: #216f57; --danger: #ffaaa1; --danger-action: #9b3933; --focus: #ffd166; background: #111915; color: var(--ink); }
  input, select { color: var(--ink); background: #18231e; }
}