/* platå · bøjning-drill · headpage-v2 visual style */
:root {
  --bg: oklch(0.18 0.02 150);
  --bg-elev: oklch(0.22 0.025 150);
  --surface: oklch(0.25 0.03 150);
  --fg: oklch(0.94 0.015 80);
  --muted: oklch(0.66 0.02 80);
  --border: oklch(0.36 0.02 150);
  --accent: oklch(0.72 0.16 55);          /* ember */
  --accent-soft: oklch(0.72 0.16 55 / 0.18);
  --good: oklch(0.78 0.16 145);
  --bad: oklch(0.66 0.20 25);
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 0 oklch(0.10 0.02 150), 0 8px 24px oklch(0.10 0.02 150 / 0.4);
  --display-stack: "Fraunces", ui-serif, Georgia, serif;
  --body-stack: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono-stack: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { color-scheme: dark; }
body {
  background: radial-gradient(ellipse at top, oklch(0.22 0.03 150) 0%, var(--bg) 50%, oklch(0.14 0.02 150) 100%) fixed;
  color: var(--fg);
  font-family: var(--body-stack);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100dvh;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 64px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* ---------- header ---------- */
.hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
  color: var(--fg);
  font-family: var(--display-stack);
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 20px;
}
.brand-mark { color: var(--accent); font-size: 22px; line-height: 1; }
.brand-sep { color: var(--muted); font-weight: 400; }
.brand-sub { font-family: var(--body-stack); font-size: 13px; color: var(--muted); font-weight: 500; letter-spacing: 0.02em; }
.brand-sub .ver { font-family: var(--mono-stack); font-size: 11px; opacity: 0.7; margin-left: 4px; }
.hdr-actions { display: flex; gap: 4px; }
.icon-btn {
  width: 36px; height: 36px;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--mono-stack);
  font-size: 16px;
  cursor: pointer;
  transition: color 120ms, background 120ms, border-color 120ms;
}
.icon-btn:hover { color: var(--fg); background: var(--bg-elev); border-color: var(--accent); }

/* ---------- stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.stat {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 8px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.stat-num {
  font-family: var(--display-stack);
  font-size: 22px;
  font-weight: 600;
  color: var(--fg);
  line-height: 1;
  letter-spacing: -0.01em;
}
.stat-label {
  font-family: var(--body-stack);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.kernel-note {
  margin: 8px 0 18px;
  font-family: var(--mono-stack);
  font-size: 12px;
  color: var(--muted);
}

/* ---------- pickers ---------- */
.pickers {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.picker-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.picker-label {
  font-family: var(--mono-stack);
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  min-width: 48px;
}
.chip-group { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  font-family: var(--body-stack);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: color 120ms, background 120ms, border-color 120ms;
}
.chip:hover { color: var(--fg); border-color: oklch(0.50 0.03 150); }
.chip[aria-selected="true"] {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

.plan-context-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  display: grid;
  gap: 8px;
}
.plan-context-card.completed { border-left-color: var(--good); background: oklch(0.78 0.16 145 / 0.08); }
.plan-context-card .eyebrow {
  margin: 0;
  font-family: var(--mono-stack);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.plan-context-card h3 { margin: 0; font-family: var(--display-stack); font-size: 22px; line-height: 1.14; color: var(--fg); }
.plan-context-card p { margin: 0; color: var(--muted); line-height: 1.55; }
.plan-context-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.plan-context-meta span {
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--mono-stack);
  font-size: 11px;
  color: var(--accent);
}
.plan-context-link { color: var(--fg); font-weight: 700; text-decoration-color: var(--accent); text-underline-offset: 4px; }

/* ---------- drill card ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 240px;
}
.prompt-meta { display: flex; gap: 8px; }
.meta-pill {
  font-family: var(--mono-stack);
  font-size: 11px;
  color: var(--muted);
  background: var(--bg-elev);
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}
.prompt {
  font-family: var(--display-stack);
  font-size: clamp(28px, 6vw, 38px);
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--fg);
  margin: 0;
  line-height: 1.15;
}
.prompt-hint {
  font-family: var(--body-stack);
  font-size: 13px;
  color: var(--muted);
  margin: 0;
  margin-top: -8px;
  font-style: italic;
}
.answer-form { display: flex; gap: 8px; }
.answer-input {
  flex: 1;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-family: var(--mono-stack);
  font-size: 17px;
  outline: none;
  transition: border-color 120ms, background 120ms;
}
.answer-input:focus { border-color: var(--accent); background: var(--bg-elev); }
.answer-input.correct { border-color: var(--good); background: oklch(0.78 0.16 145 / 0.08); }
.answer-input.wrong { border-color: var(--bad); background: oklch(0.66 0.20 25 / 0.08); }

.btn {
  font-family: var(--body-stack);
  font-size: 14px;
  font-weight: 500;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 120ms, color 120ms, border-color 120ms;
}
.btn-primary {
  background: var(--accent);
  color: oklch(0.18 0.02 150);
  border-color: var(--accent);
  font-weight: 600;
}
.btn-primary:hover { background: oklch(0.78 0.16 55); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--bg-elev); border-color: var(--accent); }

.feedback {
  font-family: var(--body-stack);
  font-size: 14px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.feedback.good { color: var(--good); background: oklch(0.78 0.16 145 / 0.10); border-color: oklch(0.78 0.16 145 / 0.4); }
.feedback.bad { color: var(--bad); background: oklch(0.66 0.20 25 / 0.10); border-color: oklch(0.66 0.20 25 / 0.4); }
.feedback .correct-answer {
  font-family: var(--mono-stack);
  color: var(--fg);
  background: var(--bg);
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 4px;
}
.feedback .next-hint { color: var(--muted); font-size: 12px; margin-top: 6px; font-style: italic; }

.hidden { display: none !important; }

/* ---------- summary ---------- */
.summary-title {
  font-family: var(--display-stack);
  font-size: 28px;
  font-weight: 600;
  margin: 0;
  color: var(--fg);
  letter-spacing: -0.015em;
}
.summary-line { margin: 0; color: var(--muted); font-size: 15px; }
.summary-line strong { color: var(--fg); font-weight: 600; font-family: var(--display-stack); font-size: 17px; }
.summary-acc { margin-top: 4px; }
.summary-mistakes {
  list-style: none;
  margin: 0;
  padding: 12px 14px;
  background: var(--bg-elev);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 220px;
  overflow-y: auto;
}
.summary-mistakes li {
  font-family: var(--mono-stack);
  font-size: 13px;
  color: var(--muted);
}
.summary-mistakes li .given { color: var(--bad); text-decoration: line-through; }
.summary-mistakes li .right { color: var(--good); margin-left: 8px; }
.summary-mistakes li.empty { color: var(--muted); font-style: italic; font-family: var(--body-stack); }
.next-step-slot { display: block; }
.next-step-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.next-step-card.repeat { border-left-color: var(--bad); }
.next-step-card.enough { border-left-color: var(--good); }
.next-step-card .eyebrow {
  margin: 0;
  font-family: var(--mono-stack);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.next-step-card h3 {
  margin: 0;
  font-family: var(--display-stack);
  font-size: 22px;
  line-height: 1.14;
  color: var(--fg);
}
.next-step-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}
.next-step-card .next-step-meta {
  font-family: var(--mono-stack);
  font-size: 12px;
  color: var(--accent);
}
.next-step-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 2px; }
.next-step-card .link-button { text-decoration: none; }
.summary-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- footer ---------- */
.ftr {
  margin-top: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}
.ftr p { margin: 4px 0; }
.ftr a { color: var(--accent); text-decoration: none; }
.ftr a:hover { text-decoration: underline; }
.ftr-meta { font-family: var(--mono-stack); font-size: 11px; opacity: 0.7; }

/* ---------- responsive ---------- */
@media (max-width: 540px) {
  .app { padding: 16px 14px 48px; gap: 14px; }
  .card { padding: 20px 16px; }
  .stats { grid-template-columns: repeat(5, 1fr); gap: 4px; }
  .stat { padding: 8px 4px; }
  .stat-num { font-size: 18px; }
  .stat-label { font-size: 10px; }
  .brand-sub { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}