/* Shared dark-themed responsive stylesheet for lernen.kortekamp.net */
/* Works for vocabulary and multiple-choice quizzes */

/* ────────────────────────────────────────────────
   CSS Variables
   ──────────────────────────────────────────────── */
:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #94a3b8;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --success: #22c55e;
  --error: #ef4444;
  --warning: #f59e0b;
  --border: #475569;

  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.4);
  --transition: 150ms ease;

  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* ────────────────────────────────────────────────
   Base
   ──────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.5;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.75rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
}

ul, ol {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.25rem;
}

/* ────────────────────────────────────────────────
   Layout
   ──────────────────────────────────────────────── */
.container {
  width: min(100% - 2rem, 960px);
  margin-inline: auto;
  padding-block: 1.5rem;
}

.page-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.page-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

.page-header p {
  font-size: 1.05rem;
  max-width: 640px;
  margin-inline: auto;
}

.section {
  margin-bottom: 1.75rem;
}

.section-title {
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

/* ────────────────────────────────────────────────
   Portal cards
   ──────────────────────────────────────────────── */
.portal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.portal-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  cursor: pointer;
}

.portal-card:hover,
.portal-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.portal-card .icon {
  font-size: 2.75rem;
  line-height: 1;
  margin-bottom: 0.75rem;
}

.portal-card .title {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.portal-card .description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin: 0;
}

.portal-card a::after {
  content: "";
  position: absolute;
  inset: 0;
}

.portal-card {
  position: relative;
}

/* ────────────────────────────────────────────────
   Buttons
   ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.btn:hover:not(:disabled) {
  background: var(--bg-secondary);
  border-color: var(--accent);
}

.btn:active:not(:disabled) {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-primary {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-success {
  color: #fff;
  background: var(--success);
  border-color: var(--success);
}

.btn-danger {
  color: #fff;
  background: var(--error);
  border-color: var(--error);
}

.btn-warning {
  color: #0f172a;
  background: var(--warning);
  border-color: var(--warning);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1.125rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

/* Direction buttons (e.g. de→en / en→de) */
.direction-group {
  display: inline-flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.direction-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}

.direction-btn:hover:not(.active) {
  color: var(--text-primary);
  border-color: var(--accent);
}

.direction-btn.active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

/* ────────────────────────────────────────────────
   Quiz settings
   ──────────────────────────────────────────────── */
.quiz-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
}

.settings-section {
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.settings-section:last-of-type {
  border-bottom: none;
}

.settings-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.settings-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.settings-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

/* Topic multi-select buttons */
.topic-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.topic-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
}

.topic-btn:hover:not(.active) {
  color: var(--text-primary);
  border-color: var(--accent);
}

.topic-btn.active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

.topic-btn .check {
  display: none;
  font-weight: 700;
}

.topic-btn.active .check {
  display: inline;
}

/* Number / select / input */
input[type="number"],
input[type="text"],
select {
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  min-width: 5rem;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgb(96 165 250 / 0.25);
}

/* ────────────────────────────────────────────────
   Quiz layout
   ──────────────────────────────────────────────── */
.progress-bar-wrap {
  width: 100%;
  height: 0.75rem;
  background: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 1rem;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 250ms ease;
}

.question-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.question-meta .counter {
  font-weight: 700;
  color: var(--text-primary);
}

.question-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.question-text {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.prompt-sub {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* Answer buttons (multiple choice / vocab reveal) */
.answers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.answer-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  font-weight: 500;
  text-align: left;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}

.answer-btn:hover:not(:disabled, .correct, .wrong) {
  border-color: var(--accent);
  background: var(--bg-secondary);
}

.answer-btn.correct {
  color: #fff;
  background: var(--success);
  border-color: var(--success);
}

.answer-btn.wrong {
  color: #fff;
  background: var(--error);
  border-color: var(--error);
}

.answer-btn .icon-mark {
  font-weight: 700;
  margin-left: 0.5rem;
}

/* Vocabulary typed answer */
.answer-input-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.answer-input-row input {
  flex: 1 1 240px;
}

/* Feedback boxes */
.feedback {
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin-bottom: 1rem;
  display: none;
}

.feedback.show {
  display: block;
}

.feedback.correct {
  color: #dcfce7;
  background: rgb(34 197 94 / 0.15);
  border-color: var(--success);
}

.feedback.wrong {
  color: #fee2e2;
  background: rgb(239 68 68 / 0.15);
  border-color: var(--error);
}

.feedback.hint {
  color: #fef3c7;
  background: rgb(245 158 11 / 0.15);
  border-color: var(--warning);
}

.feedback-title {
  font-weight: 700;
  margin-bottom: 0.25rem;
}

/* ────────────────────────────────────────────────
   Results & history
   ──────────────────────────────────────────────── */
.results-card {
  text-align: center;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
}

.results-score {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.results-label {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.results-breakdown {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.result-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 80px;
}

.result-stat .value {
  font-size: 1.5rem;
  font-weight: 700;
}

.result-stat .key {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.result-stat.correct .value { color: var(--success); }
.result-stat.wrong .value { color: var(--error); }
.result-stat.pending .value { color: var(--warning); }

/* Today history */
.history-section {
  margin-top: 1.5rem;
}

.history-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.history-item .time {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.history-item .score {
  font-weight: 700;
}

.history-item .score.good { color: var(--success); }
.history-item .score.bad { color: var(--error); }

/* Wrong-answer review list */
.wrong-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.wrong-item {
  padding: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.wrong-question {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.wrong-answer {
  color: var(--text-secondary);
}

.wrong-answer .label {
  color: var(--text-muted);
}

.wrong-answer .user { color: var(--error); }
.wrong-answer .correct { color: var(--success); }

/* ────────────────────────────────────────────────
   Stats cards & charts
   ──────────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.stat-card {
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.stat-card .stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-primary);
}

.stat-card .stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.stat-card .stat-change {
  font-size: 0.8rem;
  margin-top: 0.25rem;
  color: var(--text-muted);
}

.stat-card .stat-change.up { color: var(--success); }
.stat-card .stat-change.down { color: var(--error); }

/* Topic stat cards with colored left border */
.topic-stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.topic-stat-card {
  padding: 1rem 1rem 1rem 1.125rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left-width: 5px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.topic-stat-card .topic-name {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.topic-stat-card .topic-score {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
}

.topic-stat-card .topic-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Preset accent colors; override inline for per-topic hues */
.topic-stat-card.accent-blue { border-left-color: #3b82f6; }
.topic-stat-card.accent-green { border-left-color: #22c55e; }
.topic-stat-card.accent-red { border-left-color: #ef4444; }
.topic-stat-card.accent-yellow { border-left-color: #eab308; }
.topic-stat-card.accent-purple { border-left-color: #a855f7; }
.topic-stat-card.accent-pink { border-left-color: #ec4899; }
.topic-stat-card.accent-cyan { border-left-color: #06b6d4; }
.topic-stat-card.accent-orange { border-left-color: #f97316; }

/* Simple bar charts built with CSS */
.bar-chart {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.bar-row {
  display: grid;
  grid-template-columns: 7rem 1fr auto;
  align-items: center;
  gap: 0.75rem;
}

.bar-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bar-track {
  height: 1rem;
  background: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 300ms ease;
}

.bar-fill.good { background: var(--success); }
.bar-fill.bad { background: var(--error); }
.bar-fill.ok { background: var(--warning); }

.bar-value {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* ────────────────────────────────────────────────
   Utility helpers
   ──────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-error { color: var(--error); }
.text-warning { color: var(--warning); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }

.flex {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ────────────────────────────────────────────────
   Responsive breakpoints
   ──────────────────────────────────────────────── */
@media (max-width: 640px) {
  .container {
    padding-block: 1rem;
    width: min(100% - 1rem, 960px);
  }

  .quiz-container {
    padding: 1rem;
  }

  .portal-grid {
    grid-template-columns: 1fr;
  }

  .settings-row {
    flex-direction: column;
    align-items: stretch;
  }

  .answers {
    gap: 0.5rem;
  }

  .answer-btn {
    padding: 0.75rem;
  }

  .question-card {
    padding: 1rem;
  }

  .results-breakdown {
    gap: 1rem;
  }

  .bar-row {
    grid-template-columns: 4.5rem 1fr auto;
    gap: 0.5rem;
  }

  .bar-label {
    font-size: 0.8rem;
  }
}

@media (min-width: 641px) and (max-width: 900px) {
  .portal-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 901px) {
  .answers {
    grid-template-columns: 1fr 1fr;
  }
}