/* Color palette */
:root {
  --canada-red: #FF0000;
  --canada-white: #FFFFFF;
  --canada-blue: #007AC2;
  --text: #0F172A; /* slate-900 */
  --muted-text: #475569; /* slate-600 */
  --bg: #F8FAFC; /* slate-50 */
  --card: #FFFFFF;
  --border: #E2E8F0; /* slate-200 */
  --shadow: 0 10px 25px rgba(0,0,0,0.08);
  --bg-gradient: linear-gradient(135deg, #fff 0%, #f5f7fb 40%, #eef5fb 100%);
}

/* Dark mode colors */
[data-theme="dark"] {
  --text: #F1F5F9; /* slate-100 */
  --muted-text: #94A3B8; /* slate-400 */
  --bg: #0F172A; /* slate-900 */
  --card: #1E293B; /* slate-800 */
  --border: #334155; /* slate-700 */
  --shadow: 0 10px 25px rgba(0,0,0,0.3);
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 40%, #334155 100%);
}

* { box-sizing: border-box; }
html, body, #root { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, 'Apple Color Emoji', 'Segoe UI Emoji';
  background: var(--bg-gradient);
  color: var(--text);
  transition: background 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 96px 24px 24px;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 0;
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .header {
  background: rgba(15, 23, 42, 0.9);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.flag-image {
  height: 38px;
  width: auto;
  border-radius: 4px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.title {
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.3px;
}

.meta {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.chip {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted-text);
  font-weight: 600;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow);
  transition: background 0.3s ease, border-color 0.3s ease;
}
.chip.timer.warn { color: var(--canada-red); border-color: #fecaca; background: #fff1f2; }
[data-theme="dark"] .chip.timer.warn { background: #450a0a; border-color: #7f1d1d; }

.dark-mode-toggle {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  transition: transform 0.08s ease, background 0.3s ease, border-color 0.3s ease;
}
.dark-mode-toggle:hover {
  transform: scale(1.05);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  box-shadow: var(--shadow);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.question-stem {
  font-size: 22px;
  line-height: 1.6;
  margin-bottom: 20px;
  font-weight: 600;
}

.answers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.answer {
  width: 100%;
  text-align: left;
  background: var(--card);
  border: 2px solid var(--border);
  padding: 18px 20px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 17px;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.answer:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.answer.selected { border-color: var(--canada-blue); background: #f0f7ff; }
[data-theme="dark"] .answer.selected { background: #1e3a5f; border-color: #60a5fa; }
.answer.correct { background: #ecfdf5; border-color: #86efac; color: #065f46; }
[data-theme="dark"] .answer.correct { background: #064e3b; border-color: #34d399; color: #d1fae5; }
.answer.incorrect { background: #fff1f2; border-color: #fecaca; color: #991b1b; }
[data-theme="dark"] .answer.incorrect { background: #450a0a; border-color: #f87171; color: #fecaca; }

.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 20px;
  gap: 12px;
}

.btn {
  padding: 14px 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.3s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn.primary { background: var(--canada-red); color: #fff; border-color: #e11d48; }
.btn.primary:hover { background: #dc2626; }
.btn.danger { background: #fff1f2; color: #b91c1c; border-color: #fecaca; }
[data-theme="dark"] .btn.danger { background: #450a0a; color: #fca5a5; border-color: #7f1d1d; }
.btn.danger:hover { background: #ffe4e6; }
[data-theme="dark"] .btn.danger:hover { background: #7f1d1d; }
.btn.ghost { background: var(--card); color: var(--text); }
[data-theme="dark"] .btn.ghost { border-color: #475569; }
[data-theme="dark"] .btn.ghost:hover { background: #334155; border-color: #60a5fa; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.progress {
  height: 10px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin: 20px 0 12px;
  transition: background 0.3s ease;
}
.progress > span {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--canada-blue), #00b4d8);
  transition: width 300ms ease;
}

.summary {
  display: grid;
  gap: 16px;
}

.pass-fail-banner {
  text-align: center;
  padding: 32px 24px;
  border-radius: 16px;
  margin-bottom: 24px;
  border: 3px solid;
}

.pass-fail-banner.pass {
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
  border-color: #10b981;
  color: #065f46;
}

[data-theme="dark"] .pass-fail-banner.pass {
  background: linear-gradient(135deg, #064e3b 0%, #065f46 100%);
  border-color: #34d399;
  color: #d1fae5;
}

.pass-fail-banner.fail {
  background: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%);
  border-color: #ef4444;
  color: #991b1b;
}

[data-theme="dark"] .pass-fail-banner.fail {
  background: linear-gradient(135deg, #450a0a 0%, #7f1d1d 100%);
  border-color: #f87171;
  color: #fecaca;
}

.pass-fail-banner .status {
  font-size: 56px;
  font-weight: 900;
  letter-spacing: 2px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.pass-fail-banner .message {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.pass-fail-banner .score {
  font-size: 18px;
  opacity: 0.9;
}

.summary .row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: start;
}
.summary .badge { font-weight: 700; font-size: 16px; }
.summary .ok { color: #16a34a; }
[data-theme="dark"] .summary .ok { color: #86efac; }
.summary .no { color: #dc2626; }
[data-theme="dark"] .summary .no { color: #f87171; }

.footnote {
  color: var(--muted-text);
  font-size: 15px;
  line-height: 1.7;
  padding: 16px;
  background: var(--bg);
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-top: 16px;
}

.footnote strong {
  color: var(--text);
  font-weight: 700;
}

.footnote .reference-line {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  font-size: 14px;
}

@media (min-width: 720px) {
  .answers { grid-template-columns: 1fr 1fr; }
}

/* Home grid */
.tests-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.test-card {
  text-align: left;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 20px;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.3s ease;
}
.test-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--canada-blue); }
.test-title { font-weight: 700; font-size: 18px; margin-bottom: 8px; }
.test-meta { color: var(--muted-text); font-size: 15px; margin-bottom: 4px; }
.test-actions { margin-top: 12px; display: flex; justify-content: flex-end; }

@media (min-width: 720px) {
  .tests-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .tests-grid { grid-template-columns: repeat(4, 1fr); }
}

/* Modal styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.modal-content {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: slideUp 0.3s ease-out;
  transition: background 0.3s ease, border-color 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-content strong {
  display: block;
  color: var(--text);
  margin-bottom: 16px;
}

.modal-content > div:nth-child(2) {
  color: var(--muted-text);
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 24px;
}

.btn.large {
  padding: 16px 24px;
  font-size: 17px;
  width: 100%;
}

.btn.large.primary {
  background: var(--canada-red);
  color: #fff;
  border-color: #e11d48;
}

.btn.large.primary:hover {
  background: #dc2626;
}

.btn.large.ghost {
  background: var(--card);
  color: var(--text);
  border-color: var(--border);
}

.btn.large.ghost:hover {
  background: var(--bg);
}