/* ============================================================
   THEME
   Dark-mode friendly by default; falls back to a light palette
   if the OS prefers light. All colors are CSS variables so you
   can retune the palette in one place. Shared by every language
   page under learn.carlsorenson.me.
   ============================================================ */
:root {
  --bg: #14161a;
  --bg-elevated: #1c1f26;
  --border: #2c313c;
  --text: #e7e9ee;
  --text-dim: #9aa1b0;
  --accent: #7dd3c0;
  --accent-strong: #4fb8a3;
  --correct: #6fcf7c;
  --correct-bg: rgba(111, 207, 124, 0.14);
  --wrong: #e07a7a;
  --wrong-bg: rgba(224, 122, 122, 0.14);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  --radius: 12px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f5f1;
    --bg-elevated: #ffffff;
    --border: #e1ddd3;
    --text: #232323;
    --text-dim: #6b6b6b;
    --accent: #1f8a75;
    --accent-strong: #146c5a;
    --correct: #2e8b3d;
    --correct-bg: rgba(46, 139, 61, 0.1);
    --wrong: #c0392b;
    --wrong-bg: rgba(192, 57, 43, 0.1);
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  justify-content: center;
  padding: 32px 16px 64px;
}

.app {
  width: 100%;
  max-width: 640px;
}

header.page-header {
  text-align: center;
  margin-bottom: 24px;
}
header.page-header h1 {
  margin: 0 0 4px;
  font-size: 1.5rem;
}
header.page-header p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* ---- Identity bar (sign in / sign out) ---- */
.identity-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: center;
}
.identity-email {
  color: var(--text);
  font-weight: 600;
}
.identity-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.8rem;
  cursor: pointer;
}
.identity-btn:hover { color: var(--text); border-color: var(--text-dim); }
.identity-form {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}
.identity-form input[type="email"] {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 0.85rem;
  min-width: 200px;
}
.identity-hint {
  color: var(--text-dim);
}

/* Tabs */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.tab-btn {
  flex: 1;
  padding: 10px 12px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.mode-panel { display: none; }
.mode-panel.active { display: block; }

/* Shared card look */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.score-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 12px;
}
.score-bar .score-nums span { color: var(--text); font-weight: 600; }
.reset-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.8rem;
  cursor: pointer;
}
.reset-btn:hover { color: var(--text); border-color: var(--text-dim); }

/* ---- Vocab drill: scope controls ---- */
.scope-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.scope-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  white-space: nowrap;
}
.scope-select {
  flex: 1;
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.88rem;
}
.pos-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}
.pos-chip {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 0.76rem;
  cursor: pointer;
}
.pos-chip.active {
  background: var(--accent);
  color: #0b0d10;
  border-color: var(--accent);
  font-weight: 600;
}

/* ---- Vocab drill: progress panel ---- */
.tier-progress {
  margin-top: 14px;
  display: grid;
  gap: 16px;
}
.tier-row-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.85rem;
  margin-bottom: 6px;
  gap: 8px;
}
.tier-row-name {
  font-weight: 600;
}
.tier-row-name.locked { color: var(--text-dim); }
.tier-row-count {
  color: var(--text-dim);
  white-space: nowrap;
}
.tier-bar {
  height: 6px;
  border-radius: 4px;
  background: var(--border);
  overflow: hidden;
}
.tier-bar-fill {
  height: 100%;
  background: var(--accent);
}
.tier-lock-note {
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--text-dim);
}
.progress-actions {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  text-align: right;
}

/* ---- Vocab drill ---- */
.vocab-direction {
  text-align: center;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin-bottom: 10px;
}
.vocab-prompt {
  text-align: center;
  font-size: 1.7rem;
  font-weight: 600;
  padding: 28px 8px;
  min-height: 1.4em;
}
.vocab-prompt.empty-state {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-dim);
  line-height: 1.5;
}
.vocab-answer {
  text-align: center;
  font-size: 1.1rem;
  color: var(--accent);
  padding-bottom: 12px;
  min-height: 1.4em;
}
.vocab-category {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.btn-row {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 12px;
}
button.primary {
  background: var(--accent);
  color: #0b0d10;
  border: none;
  border-radius: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
button.primary:hover { background: var(--accent-strong); }

button.grade-good {
  background: var(--correct-bg);
  color: var(--correct);
  border: 1px solid var(--correct);
  border-radius: 8px;
  padding: 10px 18px;
  font-weight: 600;
  cursor: pointer;
}
button.grade-bad {
  background: var(--wrong-bg);
  color: var(--wrong);
  border: 1px solid var(--wrong);
  border-radius: 8px;
  padding: 10px 18px;
  font-weight: 600;
  cursor: pointer;
}
button.grade-good:hover, button.grade-bad:hover { filter: brightness(1.15); }

/* ---- Session complete card (both modes) ---- */
.session-complete { text-align: center; }
.session-complete-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.session-complete-score {
  font-size: 1.7rem;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 18px;
}

/* ---- Grammar drill ---- */
details.reference-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 20px;
}
details.reference-panel summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
  outline: none;
}
.ref-table {
  margin-top: 14px;
  display: grid;
  gap: 14px;
}
.ref-row {
  border-top: 1px solid var(--border);
  padding-top: 12px;
}
.ref-row:first-child { border-top: none; padding-top: 0; }
.ref-focus-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 3px;
}
.ref-form {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
}
.ref-example {
  margin-top: 4px;
  font-size: 0.9rem;
}
.ref-example .tl { color: var(--accent); }
.ref-example .en { color: var(--text-dim); }
.ref-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}
.ref-note code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
}
.ref-irregular {
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid var(--wrong);
  background: var(--wrong-bg);
  border-radius: 8px;
  font-size: 0.85rem;
  line-height: 1.5;
}
.ref-irregular .ref-focus-label {
  color: var(--wrong);
  margin-bottom: 6px;
}
.ref-irregular .irregular-example {
  margin-top: 8px;
  font-size: 1rem;
}
.ref-irregular .wrong-form {
  color: var(--wrong);
  text-decoration: line-through;
}
.ref-irregular .correct-form {
  color: var(--correct);
  font-weight: 700;
}
.ref-irregular .irregular-more {
  margin-top: 6px;
  color: var(--text-dim);
}

.grammar-english {
  font-size: 1.05rem;
  text-align: center;
  margin-bottom: 18px;
  line-height: 1.5;
}
.grammar-english strong {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: var(--accent-strong);
}
.grammar-tagalog {
  text-align: center;
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 22px;
}
.blank-slot {
  display: inline-block;
  min-width: 90px;
  border-bottom: 2px solid var(--text-dim);
  color: var(--accent);
}

.choices {
  display: grid;
  gap: 10px;
  margin-bottom: 8px;
}
.choice-btn {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
}
.choice-btn:hover:not(:disabled) { border-color: var(--accent); }
.choice-btn:disabled { cursor: default; }
.choice-btn.correct { background: var(--correct-bg); border-color: var(--correct); color: var(--correct); }
.choice-btn.wrong { background: var(--wrong-bg); border-color: var(--wrong); color: var(--wrong); }

.feedback {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  display: none;
}
.feedback.show { display: block; }
.feedback .full-sentence {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 6px;
}
.feedback .explanation {
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.next-row {
  text-align: center;
  margin-top: 18px;
}

/* ---- Landing page (language picker) ---- */
.language-grid {
  display: grid;
  gap: 12px;
}
.language-link {
  display: block;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  color: var(--text);
  text-decoration: none;
}
.language-link:hover { border-color: var(--accent); }
.language-link .lang-name {
  font-size: 1.1rem;
  font-weight: 700;
}
.language-link .lang-note {
  margin-top: 4px;
  font-size: 0.85rem;
  color: var(--text-dim);
}
.language-link[aria-disabled="true"] {
  opacity: 0.5;
  pointer-events: none;
}