:root {
  --bg: #0f1115;
  --bg-elev: #171a21;
  --bg-elev-2: #1e222b;
  --border: #2a2f3a;
  --text: #e6e8ec;
  --text-dim: #9aa3b2;
  --accent: #6ea8fe;
  --accent-strong: #3b82f6;
  --ok: #22c55e;
  --ok-bg: rgba(34, 197, 94, 0.12);
  --ko: #ef4444;
  --ko-bg: rgba(239, 68, 68, 0.12);
  --warn: #f59e0b;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  --maxw: 880px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6f8;
    --bg-elev: #ffffff;
    --bg-elev-2: #f0f2f5;
    --border: #dfe3ea;
    --text: #1a1d23;
    --text-dim: #5b6472;
    --accent: #2563eb;
    --accent-strong: #1d4ed8;
    --ok-bg: rgba(34, 197, 94, 0.14);
    --ko-bg: rgba(239, 68, 68, 0.12);
    --shadow: 0 6px 20px rgba(20, 30, 60, 0.08);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 18px;
}

/* ---------- Header ---------- */
.site-header {
  padding: 36px 0 22px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-elev) 0%, var(--bg) 100%);
}

.site-header h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 6px 0 22px;
  color: var(--text-dim);
  font-size: 1rem;
}

.dashboard {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.stat {
  display: flex;
  flex-direction: column;
  padding: 10px 16px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-width: 120px;
}

.stat-value {
  font-size: 1.35rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.toolbar {
  display: flex;
  gap: 8px;
  margin-left: auto;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  font: inherit;
  cursor: pointer;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 9px 16px;
  background: var(--accent-strong);
  color: #fff;
  font-weight: 600;
  transition: filter 0.15s, background 0.15s, opacity 0.15s;
}

.btn:hover {
  filter: brightness(1.08);
}

.btn:active {
  transform: translateY(1px);
}

.btn.ghost {
  background: var(--bg-elev-2);
  color: var(--text);
}

.btn.ghost.danger {
  color: var(--ko);
}

.btn.ghost:hover {
  border-color: var(--accent);
}

/* ---------- Theme accordion ---------- */
main {
  padding: 26px 18px 10px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.theme {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.theme[open] {
  border-color: var(--accent);
}

summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  user-select: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::before {
  content: "›";
  font-size: 1.4rem;
  line-height: 1;
  color: var(--accent);
  transition: transform 0.2s;
  transform: rotate(0deg);
}

.theme[open] summary::before {
  transform: rotate(90deg);
}

.theme-title {
  font-weight: 700;
  font-size: 1.08rem;
}

.theme-meta {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-left: 2px;
}

.theme-badge {
  margin-left: auto;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.theme-badge.good {
  background: var(--ok-bg);
  color: var(--ok);
  border-color: transparent;
}

.theme-badge.bad {
  background: var(--ko-bg);
  color: var(--ko);
  border-color: transparent;
}

.theme-body {
  padding: 4px 18px 20px;
  border-top: 1px solid var(--border);
}

/* ---------- Questions ---------- */
.questions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.q {
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--bg-elev-2);
  border: 1px solid transparent;
}

.q.ok {
  border-color: var(--ok);
}

.q.ko {
  border-color: var(--ko);
}

.q.unanswered {
  border-color: var(--warn);
}

.q-text {
  margin: 0 0 12px;
  font-weight: 600;
}

.q-num {
  color: var(--text-dim);
  margin-right: 6px;
}

.opts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.opt label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}

.opt label:hover {
  border-color: var(--accent);
}

.opt input {
  margin-top: 3px;
  accent-color: var(--accent-strong);
  flex-shrink: 0;
}

.opt-text code {
  background: rgba(127, 127, 127, 0.18);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 0.92em;
}

/* Correction states */
.opt.correct label {
  border-color: var(--ok);
  background: var(--ok-bg);
}

.opt.missed label {
  border-color: var(--ok);
  background: var(--ok-bg);
  border-style: dashed;
}

.opt.wrong label {
  border-color: var(--ko);
  background: var(--ko-bg);
}

.opt.correct .opt-text::after {
  content: " ✓";
  color: var(--ok);
  font-weight: 700;
}

.opt.missed .opt-text::after {
  content: " ✓ (réponse attendue)";
  color: var(--ok);
  font-weight: 700;
}

.opt.wrong .opt-text::after {
  content: " ✗";
  color: var(--ko);
  font-weight: 700;
}

/* ---------- Theme actions ---------- */
.theme-actions {
  margin-top: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.theme-result {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.theme-result.good {
  color: var(--ok);
}

.theme-result.bad {
  color: var(--ko);
}

.q-hint {
  margin: 8px 0 0;
  color: var(--text-dim);
  font-size: 0.92rem;
  border-left: 3px solid var(--accent);
  padding-left: 10px;
}

.theme.reading .theme-meta {
  color: var(--warn);
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 30px;
  padding: 24px 0 50px;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.92rem;
}

.muted {
  opacity: 0.8;
  font-size: 0.85rem;
}

@media (max-width: 560px) {
  .toolbar {
    margin-left: 0;
    width: 100%;
  }
  .theme-badge {
    margin-left: auto;
  }
}