/* ── Reset & Base ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --green: #2ecc71;
  --red: #e74c3c;
  --blue: #3498db;
  --dark: #2c3e50;
  --light: #ecf0f1;
  --white: #fff;
  --gray: #95a5a6;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,.12);
}

html { font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--light);
  color: var(--dark);
  min-height: 100dvh;
  overflow-x: hidden;
}

/* ── Screens ──────────────────────────────────────── */
.screen { display: none; padding: 16px; max-width: 480px; margin: 0 auto; }
.screen.active { display: block; }

h1 { text-align: center; font-size: 2rem; margin-top: 24px; }
h2 { font-size: 1.4rem; margin-bottom: 12px; }
.subtitle { text-align: center; color: var(--gray); margin-bottom: 24px; }

/* ── Card ─────────────────────────────────────────── */
.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}

/* ── Buttons ──────────────────────────────────────── */
button {
  cursor: pointer;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  padding: 14px 20px;
  transition: background .15s, transform .1s;
  -webkit-tap-highlight-color: transparent;
}
button:active { transform: scale(.97); }

.btn-primary {
  background: var(--blue);
  color: var(--white);
  width: 100%;
  margin-bottom: 12px;
  font-weight: 600;
}
.btn-primary:disabled {
  background: var(--gray);
  cursor: not-allowed;
}
.btn-secondary {
  background: var(--white);
  color: var(--dark);
  border: 2px solid var(--dark);
  width: 100%;
  margin-bottom: 12px;
}
.btn-danger {
  background: var(--red);
  color: var(--white);
  width: 100%;
  margin-bottom: 12px;
}
.btn-small { padding: 8px 14px; font-size: .85rem; width: auto; }
.btn-icon {
  width: 48px;
  height: 48px;
  font-size: 1.4rem;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--dark);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-icon.listening {
  border-color: var(--red);
  animation: pulse .8s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(231,76,60,.4); }
  50% { box-shadow: 0 0 0 10px rgba(231,76,60,0); }
}

/* ── Mode toggle ──────────────────────────────────── */
.mode-toggle { display: flex; gap: 8px; }
.mode-btn {
  flex: 1;
  padding: 10px 8px;
  font-size: .85rem;
  background: var(--light);
  color: var(--dark);
  border-radius: var(--radius);
}
.mode-btn.active { background: var(--blue); color: var(--white); }

/* ── Checkbox / Chip ──────────────────────────────── */
.checkbox-group { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--light);
  font-size: .85rem;
  cursor: pointer;
  user-select: none;
  transition: background .15s;
}
.chip input { display: none; }
.chip.selected { background: var(--blue); color: var(--white); }

.chip-group { display: flex; gap: 6px; flex-wrap: wrap; }
.chip-color {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: var(--light);
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0.4;
  transition: opacity 0.15s, border-color 0.15s;
  padding: 0;
}
.chip-color:hover { opacity: 0.7; }
.chip-color.selected { opacity: 1; border-color: #666; }

/* ── Inputs ───────────────────────────────────────── */
input[type="text"], input[type="email"], input[type="password"], select {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid #ddd;
  border-radius: var(--radius);
  font-size: 1rem;
  margin-bottom: 10px;
  -webkit-appearance: none;
}
input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus, select:focus {
  outline: none;
  border-color: var(--blue);
}
label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .9rem; }

/* ── Quiz ─────────────────────────────────────────── */
.quiz-header {
  display: flex;
  justify-content: space-between;
  font-weight: 600;
  margin-bottom: 20px;
  padding: 12px 0;
  border-bottom: 2px solid #ddd;
}
.quiz-prompt {
  text-align: center;
  font-size: 1.8rem;
  font-weight: 700;
  padding: 32px 16px;
  background: var(--white);
  border-radius: var(--radius);
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.quiz-feedback {
  text-align: center;
  font-size: 1.3rem;
  font-weight: 700;
  min-height: 40px;
  margin-bottom: 12px;
  transition: opacity .2s;
}
.quiz-feedback.correct { color: var(--green); }
.quiz-feedback.incorrect { color: var(--red); }
.quiz-feedback.close { color: #f39c12; }

.quiz-input-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.quiz-input-row input { flex: 1; margin-bottom: 0; }

.quiz-actions { display: flex; gap: 8px; }
.quiz-actions button { flex: 1; }

.quiz-bottom-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  justify-content: center;
  align-items: center;
}

.importance-buttons { display: flex; gap: 4px; }
.btn-importance {
  background: none;
  border: 2px solid transparent;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  font-size: 16px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  opacity: 0.4;
  transition: opacity 0.15s, border-color 0.15s;
}
.btn-importance:hover { opacity: 0.7; }
.btn-importance.active { opacity: 1; border-color: #666; }

/* ── Results ──────────────────────────────────────── */
.results-stats {
  text-align: center;
  font-size: 1.2rem;
  margin-bottom: 16px;
  padding: 16px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.results-list {
  list-style: none;
  margin-bottom: 16px;
}
.results-list li {
  padding: 10px 14px;
  margin-bottom: 6px;
  border-radius: var(--radius);
  background: var(--white);
  display: flex;
  justify-content: space-between;
  font-size: .95rem;
}
.results-list li.correct { border-left: 4px solid var(--green); }
.results-list li.incorrect { border-left: 4px solid var(--red); }

.results-actions { display: flex; gap: 8px; }
.results-actions button { flex: 1; }

/* ── Manage ───────────────────────────────────────── */
#screen-manage { max-width: 720px; }
.manage-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.manage-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
.manage-filters input,
.manage-filters select { flex: 1; min-width: 120px; margin-bottom: 0; }

.table-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 12px;
}
table { width: 100%; border-collapse: collapse; font-size: .85rem; }
th, td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid #ddd;
}
th { background: var(--dark); color: var(--white); position: sticky; top: 0; }
td .actions { display: flex; gap: 4px; }
td .actions button { padding: 6px 10px; font-size: .75rem; }

/* ── Modal ────────────────────────────────────────── */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}
.modal.hidden { display: none; }
.modal-content {
  background: var(--white);
  border-radius: var(--radius);
  padding: 20px;
  width: 100%;
  max-width: 420px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 4px 24px rgba(0,0,0,.2);
}
.modal-actions { display: flex; gap: 8px; margin-top: 12px; }
.modal-actions button { flex: 1; }

.checkbox-group { display: flex; flex-direction: column; gap: 6px; margin: 8px 0; max-height: 200px; overflow-y: auto; }
.checkbox-group label { display: flex; align-items: center; gap: 6px; cursor: pointer; }

/* ── Translation row (in modal) ───────────────────── */
.translation-row {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}
.translation-row input { flex: 1; margin-bottom: 0; }
.translation-row select { width: 80px; flex-shrink: 0; margin-bottom: 0; }
.translation-row button { width: 36px; flex-shrink: 0; padding: 8px; }

/* ── Category list (in modal) ─────────────────────── */
.category-list { list-style: none; margin: 12px 0; }
.category-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid #eee;
}
.category-list li .actions { display: flex; gap: 4px; }

/* ── Form row ─────────────────────────────────────── */
.form-row { display: flex; gap: 8px; align-items: center; }
.form-row input { flex: 1; margin-bottom: 0; }

/* ── Import row ───────────────────────────────────── */
.import-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.import-row button { flex: 1; }

/* ── Utility ──────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Auth Screens ─────────────────────────────────── */
.auth-card {
  margin-top: 8px;
}
.auth-card h3 {
  text-align: center;
  margin-bottom: 16px;
  font-size: 1.2rem;
}
.auth-error {
  background: #fdecea;
  color: var(--red);
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: .9rem;
  margin-bottom: 12px;
}
.auth-info {
  color: var(--gray);
  font-size: .9rem;
  margin-bottom: 12px;
  text-align: center;
}
.auth-link {
  text-align: center;
  font-size: .9rem;
  color: var(--gray);
  margin-top: 12px;
}
.auth-link a {
  color: var(--blue);
  text-decoration: none;
  font-weight: 600;
}
.auth-divider {
  display: flex;
  align-items: center;
  margin: 16px 0;
  gap: 12px;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: #ddd;
}
.auth-divider span {
  color: var(--gray);
  font-size: .85rem;
}

/* ── Home Header / User Menu ──────────────────────── */
.home-header {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding: 8px 0;
}
.user-menu {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .9rem;
}
.user-menu span {
  font-weight: 600;
  color: var(--dark);
}

/* ── Responsive (larger phones / tablets) ─────────── */
@media (min-width: 480px) {
  .screen { padding: 24px; }
  .quiz-prompt { font-size: 2.2rem; padding: 40px 24px; }
}