/* DriveAI Lite — one-hour workshop UI */

:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --panel-2: #f4f4f6;
  --line: #e4e4e9;
  --text: #18181b;
  --muted: #6b6b76;
  --dim: #9a9aa5;
  --accent: #1e9bff;
  --accent-ink: #0a5fb0;
  --good: #16a34a;
  --bad: #dc2626;
  --warn: #b45309;
  --mono: 'JetBrains Mono', 'Fira Code', ui-monospace, Consolas, monospace;
  --sans: 'Inter', system-ui, -apple-system, sans-serif;
  --display: 'Manrope', system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; height: 100%;
  background: var(--bg); color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: var(--display); margin: 0; }
button { font-family: inherit; }

/* ── Layout ─────────────────────────────────────────────────────────── */

.app { display: flex; flex-direction: column; height: 100vh; }

.topbar {
  display: flex; align-items: center; gap: 14px;
  height: 44px; padding: 0 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  flex-shrink: 0;
}
.brand { display: flex; align-items: center; gap: 9px; font-family: var(--display); font-weight: 800; font-size: 14px; }
.brand img { height: 20px; }
.brand .x { color: var(--dim); font-weight: 300; }
.brand .accent { color: var(--accent); }

.steps { display: flex; gap: 5px; margin-left: auto; flex-wrap: wrap; }
.step-pill {
  display: flex; align-items: center; gap: 6px;
  border: 1px solid var(--line); background: transparent;
  color: var(--muted); border-radius: 999px;
  padding: 4px 11px; font-size: 12px; font-weight: 500;
  cursor: pointer; transition: .15s;
  white-space: nowrap;
}
.step-pill:hover { border-color: #c8c8d0; color: var(--text); }
.step-pill.active { border-color: var(--accent); color: #fff; background: var(--accent); }
.step-pill.done { color: var(--good); border-color: rgba(22,163,74,.35); background: rgba(22,163,74,.06); }
.step-pill .n { font-family: var(--mono); font-size: 10.5px; opacity: .75; }

.who { font-size: 12px; color: var(--muted); }
.who b { color: var(--text); font-weight: 600; }

.main { flex: 1; display: grid; grid-template-columns: minmax(0,1.15fr) minmax(400px,.85fr); min-height: 0; }

/* ── Left: simulation ───────────────────────────────────────────────── */

.stage { display: flex; flex-direction: column; min-width: 0; min-height: 0; border-right: 1px solid var(--line); }
.canvas-wrap { flex: 1; position: relative; min-height: 0; background:
  radial-gradient(circle at 50% 40%, #f6f7f9 0%, #eceef2 70%); }
#sim { width: 100%; height: 100%; display: block; object-fit: contain; }

.badge-action {
  position: absolute; top: 12px; left: 12px;
  font-family: var(--mono); font-size: 12.5px; font-weight: 700;
  letter-spacing: .04em;
  background: rgba(30,155,255,.1); color: var(--accent-ink);
  border: 1px solid rgba(30,155,255,.3);
  padding: 6px 12px; border-radius: 6px;
}
.badge-status {
  position: absolute; top: 12px; right: 12px;
  font-size: 12px; font-weight: 600; color: var(--muted);
  background: rgba(255,255,255,.9); border: 1px solid var(--line);
  padding: 6px 12px; border-radius: 6px;
}
.badge-status.fail { color: var(--bad); border-color: rgba(220,38,38,.3); background: rgba(254,242,242,.95); }
.badge-status.win { color: var(--good); border-color: rgba(22,163,74,.3); background: rgba(240,253,244,.95); }

.controls {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px; border-top: 1px solid var(--line);
  background: var(--panel); flex-wrap: wrap;
}

.metrics { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); background: var(--panel-2); }
.metric { padding: 6px 14px; border-right: 1px solid var(--line); }
.metric:last-child { border-right: 0; }
.metric .k { font-size: 10px; text-transform: uppercase; letter-spacing: .09em; color: var(--dim); }
.metric .v { font-family: var(--mono); font-size: 15px; font-weight: 700; margin-top: 2px; }

/* ── Right: work panel ──────────────────────────────────────────────── */

.side { display: flex; flex-direction: column; min-width: 0; min-height: 0; background: var(--panel); }
.side-scroll { flex: 1; overflow-y: auto; min-height: 0; }

.step-head { padding: 11px 18px 9px; border-bottom: 1px solid var(--line); }
.step-head .eyebrow { font-family: var(--mono); font-size: 10.5px; color: var(--accent-ink); letter-spacing: .1em; text-transform: uppercase; }
.step-head h2 { font-size: 17px; font-weight: 800; margin: 3px 0 4px; letter-spacing: -.01em; }
.step-head p { margin: 0; font-size: 13px; line-height: 1.55; color: var(--muted); }
.step-head .mins { float: right; font-size: 11px; color: var(--dim); font-family: var(--mono); }

.goal {
  margin: 7px 18px 0; padding: 6px 12px;
  border: 1px solid var(--line); border-left: 3px solid var(--accent);
  border-radius: 5px; background: var(--panel-2);
  font-size: 12.5px; line-height: 1.5;
}
.goal.done { border-left-color: var(--good); }
.goal b { display: block; font-size: 10.5px; text-transform: uppercase; letter-spacing: .09em; color: var(--dim); margin-bottom: 3px; font-weight: 700; }

.block { padding: 7px 18px; }
.block h3 { font-size: 11px; text-transform: uppercase; letter-spacing: .09em; color: var(--dim); margin-bottom: 6px; font-weight: 700; }

/* ── Editor ─────────────────────────────────────────────────────────── */

.editor {
  border: 1px solid var(--line); border-radius: 7px; overflow: hidden;
  background: #fafafa;
}
.editor-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 11px; background: var(--panel-2); border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 11.5px; color: var(--muted);
}
.editor-body { display: flex; max-height: 92px; }
.gutter {
  padding: 10px 8px 10px 12px; text-align: right;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.6;
  color: #c4c4cc; user-select: none; background: #fafafa;
}
#code {
  flex: 1; border: 0; outline: 0; resize: none;
  background: transparent; color: #1f2430;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.6;
  padding: 10px 12px 10px 4px;
  min-height: 100px; tab-size: 4;
}

.err {
  margin-top: 8px; padding: 9px 12px; border-radius: 6px;
  background: #fef2f2; border: 1px solid rgba(220,38,38,.25);
  color: #b91c1c; font-family: var(--mono); font-size: 12px; line-height: 1.5;
}

/* ── Buttons ────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--line); background: #fff; color: var(--text);
  border-radius: 6px; padding: 7px 13px; font-size: 12.5px; font-weight: 600;
  cursor: pointer; transition: .15s;
}
.btn:hover:not(:disabled) { border-color: #c8c8d0; background: var(--panel-2); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover:not(:disabled) { background: #0d8ae8; border-color: #0d8ae8; }
.btn.ghost { background: transparent; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }

.hint { font-size: 12px; color: var(--dim); line-height: 1.5; margin-top: 6px; }
.hint code, code.inline { font-family: var(--mono); color: var(--accent-ink); background: rgba(30,155,255,.08); padding: 1px 5px; border-radius: 3px; font-size: 11.5px; }

details.help { margin-top: 6px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel-2); }
details.help summary { padding: 6px 12px; cursor: pointer; font-size: 12px; font-weight: 600; color: var(--muted); list-style: none; }
details.help summary::-webkit-details-marker { display: none; }
details.help summary::before { content: '▸ '; color: var(--dim); }
details.help[open] summary::before { content: '▾ '; }
details.help pre { margin: 0; padding: 0 12px 12px; }

pre { font-family: var(--mono); font-size: 11.5px; line-height: 1.55; color: #2c3140; overflow-x: auto; }
pre .kw { color: #1d4ed8; } pre .fn { color: #b45309; } pre .str { color: #15803d; } pre .cm { color: #9a9aa5; } pre .num { color: #be185d; }

/* ── State panel ────────────────────────────────────────────────────── */

.state-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.state-cell { background: var(--panel-2); padding: 4px 10px; }
.state-cell .k { font-size: 10px; color: var(--dim); font-family: var(--mono); }
.state-cell .v { font-family: var(--mono); font-size: 14px; font-weight: 700; margin-top: 1px; }
.bar { height: 3px; background: #e4e4ea; border-radius: 2px; margin-top: 4px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); border-radius: 2px; transition: width .1s linear; }

.reward-row { display: flex; justify-content: space-between; font-size: 11.5px; padding: 2px 0; border-bottom: 1px solid var(--line); }
.reward-row:last-child { border-bottom: 0; }
.reward-row span:last-child { font-family: var(--mono); font-weight: 600; }
.pos { color: var(--good); } .neg { color: var(--bad); }

table.rules { width: 100%; border-collapse: collapse; font-size: 12px; }
table.rules td { padding: 4px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
table.rules td:last-child { text-align: right; font-family: var(--mono); font-weight: 600; color: var(--text); }

/* ── Training ───────────────────────────────────────────────────────── */

#chart { width: 100%; height: 110px; display: block; border: 1px solid var(--line); border-radius: 6px; background: #fafafa; }
.train-stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; margin-top: 10px; }
.train-stats > div { background: var(--panel-2); padding: 7px 10px; }
.train-stats .k { font-size: 9.5px; color: var(--dim); text-transform: uppercase; letter-spacing: .07em; }
.train-stats .v { font-family: var(--mono); font-size: 14px; font-weight: 700; margin-top: 1px; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }
.compare > div { border: 1px solid var(--line); border-radius: 6px; padding: 10px; background: var(--panel-2); }
.compare .lbl { font-size: 10.5px; text-transform: uppercase; letter-spacing: .08em; color: var(--dim); }
.compare .big { font-family: var(--mono); font-size: 20px; font-weight: 800; margin-top: 3px; }
.compare .sub { font-size: 11px; color: var(--muted); margin-top: 2px; }
.compare .after .big { color: var(--good); }

/* ── Result code ────────────────────────────────────────────────────── */

.code-box {
  font-family: var(--mono); font-size: 24px; font-weight: 700; letter-spacing: .15em;
  text-align: center; padding: 15px; border-radius: 8px;
  background: rgba(30,155,255,.07); border: 1px solid rgba(30,155,255,.3);
  color: var(--accent-ink); margin-top: 10px; word-break: break-all;
}

input.text {
  width: 100%; padding: 8px 11px; border-radius: 6px;
  border: 1px solid var(--line); background: #fff; color: var(--text);
  font-size: 13px; font-family: var(--sans); outline: none;
}
input.text:focus { border-color: var(--accent); }
label.field { display: block; font-size: 11.5px; color: var(--muted); margin: 10px 0 4px; font-weight: 500; }

/* ── Welcome overlay ────────────────────────────────────────────────── */

.overlay {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(24,24,27,.5); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.overlay.hidden { display: none; }
.card {
  width: 100%; max-width: 420px; background: #fff;
  border: 1px solid var(--line); border-radius: 12px; padding: 24px;
  box-shadow: 0 20px 50px rgba(0,0,0,.12);
}
.card h1 { font-size: 22px; font-weight: 800; letter-spacing: -.02em; }
.card p { color: var(--muted); font-size: 13px; line-height: 1.55; margin: 8px 0 0; }
.card .plan { margin: 14px 0; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; }
.card .plan div { display: flex; justify-content: space-between; padding: 7px 12px; font-size: 12px; border-bottom: 1px solid var(--line); background: var(--panel-2); }
.card .plan div:last-child { border-bottom: 0; }
.card .plan span:last-child { font-family: var(--mono); color: var(--dim); }

.boot { font-size: 11.5px; color: var(--dim); font-family: var(--mono); }
.boot.ok { color: var(--good); }

/* ── Toast ──────────────────────────────────────────────────────────── */

.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: #fff; border: 1px solid var(--line);
  border-left: 3px solid var(--good);
  padding: 11px 16px; border-radius: 7px; font-size: 13px; font-weight: 500;
  box-shadow: 0 8px 24px rgba(0,0,0,.1);
  z-index: 60; opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-6px); }

/* ── Responsive ─────────────────────────────────────────────────────── */

@media (max-width: 1000px) {
  .app { height: auto; min-height: 100vh; }
  .topbar { height: auto; flex-wrap: wrap; padding: 10px 14px; gap: 10px; }
  .steps { order: 3; width: 100%; margin-left: 0; flex-wrap: nowrap; overflow-x: auto; padding-bottom: 2px; }
  .main { grid-template-columns: 1fr; grid-template-rows: minmax(280px, 44vh) 1fr; }
  .stage { border-right: 0; border-bottom: 1px solid var(--line); }
  .side-scroll { overflow-y: visible; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .metric:nth-child(2) { border-right: 0; }
}