:root {
  --bg: #0e1116;
  --surface: #161b22;
  --surface-2: #1f2630;
  --border: #2a3340;
  --text: #e6edf3;
  --muted: #8b949e;
  --primary: #2f81f7;
  --primary-hover: #1f6fe5;
  --success: #2ea043;
  --danger: #f85149;
  --warn: #d29922;
  --ro-blue: #002b7f;
  --ro-yellow: #fcd116;
  --ro-red: #ce1126;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 800px at 10% -10%, #1b2330 0%, var(--bg) 60%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

.app {
  max-width: 880px;
  margin: 0 auto;
  padding:
    max(24px, env(safe-area-inset-top))
    max(20px, env(safe-area-inset-right))
    max(60px, env(safe-area-inset-bottom))
    max(20px, env(safe-area-inset-left));
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.topbar h1 {
  font-size: 1.4rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.flag {
  display: inline-block;
  width: 28px;
  height: 18px;
  border-radius: 3px;
  background: linear-gradient(to right, var(--ro-blue) 0 33%, var(--ro-yellow) 33% 66%, var(--ro-red) 66% 100%);
  box-shadow: 0 0 0 1px var(--border) inset;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.lang-btn {
  font-size: 0.8rem !important;
  padding: 5px 10px !important;
  font-weight: 700;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.04em;
}

.scoreboard {
  display: flex;
  gap: 14px;
  font-size: 0.95rem;
  color: var(--muted);
  flex-wrap: wrap;
}

.scoreboard strong { color: var(--text); }

.settings {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 18px;
}

.settings details { padding: 6px 14px 14px; }

.settings summary {
  cursor: pointer;
  padding: 12px 0;
  font-weight: 600;
  user-select: none;
  list-style: none;
}

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

.settings summary::before {
  content: "▸";
  display: inline-block;
  width: 1em;
  transition: transform 0.15s ease;
}

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

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.settings fieldset {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  background: var(--surface-2);
}

.settings legend {
  padding: 0 6px;
  font-size: 0.85rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.settings label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
  font-size: 0.95rem;
  cursor: pointer;
}

/* ── Main menu ── */
.menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  padding: 48px 0 32px;
}

.menu-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 1.1rem;
}

.menu-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  width: 100%;
  max-width: 520px;
}

.menu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 36px 24px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  text-align: center;
  color: var(--text);
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
  transition: background 0.15s, border-color 0.15s, transform 0.12s, box-shadow 0.15s;
}

.menu-card:hover {
  background: var(--surface-2);
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(47,129,247,0.18);
}

.menu-card:active { transform: translateY(0); }

.menu-card-icon { font-size: 2.6rem; line-height: 1; }

.menu-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  display: block;
}

.menu-card-desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.45;
}

/* ── Card top row (back + cheat sheet) ── */
.card-toprow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 22px;
}

.back-btn {
  font-size: 0.88rem !important;
  padding: 7px 13px !important;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.cheat-btn {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}

.cheat-btn:hover {
  background: var(--surface-2);
  border-color: var(--primary);
}

.cheat-dialog {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  padding: 0;
  max-width: min(720px, 92vw);
  max-height: 85vh;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.cheat-dialog::backdrop {
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(2px);
}

.cheat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--surface);
  z-index: 1;
}

.cheat-header h2 {
  margin: 0;
  font-size: 1.15rem;
}

.cheat-close {
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  font-size: 1.6rem;
  line-height: 1;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
}

.cheat-close:hover {
  background: var(--surface-2);
  color: var(--text);
}

.cheat-content {
  padding: 16px 22px 24px;
  overflow-y: auto;
  max-height: calc(85vh - 60px);
  line-height: 1.55;
}

.cheat-content h3 {
  margin: 18px 0 8px;
  font-size: 1.05rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 4px;
}

.cheat-content h4 {
  margin: 14px 0 6px;
  font-size: 0.98rem;
  color: var(--ro-yellow);
}

.cheat-content h3:first-child { margin-top: 0; }

.cheat-content p { margin: 6px 0 10px; color: var(--text); }
.cheat-content ul { margin: 6px 0 12px; padding-left: 22px; }
.cheat-content li { margin: 3px 0; }

.cheat-content code {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88em;
  color: var(--text);
}

.cheat-content strong { color: var(--text); }

.cheat-table {
  border-collapse: collapse;
  width: 100%;
  margin: 8px 0 12px;
  font-size: 0.94rem;
}

.cheat-table th,
.cheat-table td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
}

.cheat-table th {
  background: var(--surface-2);
  color: var(--muted);
  font-weight: 600;
}

.cheat-tip {
  background: rgba(252, 209, 22, 0.08);
  border-left: 3px solid var(--ro-yellow);
  padding: 6px 10px;
  border-radius: 4px;
  margin: 8px 0 12px;
  font-size: 0.95rem;
  color: var(--text);
}

.gender-chip {
  font-size: 0.8rem;
  margin-left: 8px;
  padding: 2px 8px;
}

.gender-chip.gender-m { color: var(--ro-blue); border-color: rgba(0,43,127,0.4); background: rgba(0,43,127,0.15); }
.gender-chip.gender-f { color: #ff7b91; border-color: rgba(206,17,38,0.4); background: rgba(206,17,38,0.18); }
.gender-chip.gender-n { color: var(--ro-yellow); border-color: rgba(252,209,22,0.4); background: rgba(252,209,22,0.12); }

.prompt {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
  margin-bottom: 22px;
}

.verb {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.verb-inf {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.verb-en {
  color: var(--muted);
  font-size: 0.95rem;
  font-style: italic;
}

.ask {
  font-size: 1.05rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px;
}

.chip {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  font-weight: 600;
}

.pronoun-chip { color: var(--ro-yellow); }
.tense-chip { color: var(--primary); }

.answer { display: flex; flex-direction: column; gap: 12px; }

#answer {
  width: 100%;
  font-size: 1.25rem;
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

#answer:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(47, 129, 247, 0.25);
}

.diacritics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.diacritics button {
  font-size: 1rem;
  padding: 6px 10px 4px;
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  min-width: 44px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.1;
}

.diacritics button:hover { background: #283040; }

.diacritics button small {
  font-size: 0.65rem;
  color: var(--muted);
  margin-top: 2px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 4px;
}

button.primary, button.ghost {
  font-size: 1rem;
  padding: 10px 18px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.12s, border-color 0.12s, transform 0.05s;
}

button.primary {
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
}

button.primary:hover { background: var(--primary-hover); }
button.primary:active { transform: translateY(1px); }

button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

button.ghost:hover { background: var(--surface-2); }

.feedback {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: 10px;
  min-height: 1.4em;
  font-size: 0.98rem;
  border: 1px solid transparent;
  background: transparent;
  transition: background 0.15s, border-color 0.15s;
}

.feedback.correct {
  background: rgba(46, 160, 67, 0.12);
  border-color: rgba(46, 160, 67, 0.4);
  color: #4ac26b;
}

.feedback.almost {
  background: rgba(210, 153, 34, 0.12);
  border-color: rgba(210, 153, 34, 0.4);
  color: #e3b341;
}

.feedback.wrong {
  background: rgba(248, 81, 73, 0.12);
  border-color: rgba(248, 81, 73, 0.4);
  color: #ff7b72;
}

.feedback strong { color: inherit; }

.feedback .answer-target {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(255,255,255,0.06);
  font-weight: 700;
}

.footer {
  margin-top: 22px;
  text-align: center;
  color: var(--muted);
}

kbd {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85em;
}

.reminder-hour-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.reminder-hour-row select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.95rem;
}

.reminder-hour-row select:disabled { opacity: 0.5; }

.reminder-actions {
  margin-top: 8px;
}

.reminder-status {
  margin: 8px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
  min-height: 1.2em;
}

.reminder-status.ok { color: #4ac26b; }
.reminder-status.err { color: #ff7b72; }

@media (max-width: 520px) {
  .verb-inf { font-size: 1.6rem; }
  .ask { font-size: 0.95rem; }
  #answer { font-size: 1.1rem; }
}