:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #5f6b7d;
  --border: rgba(15, 23, 42, 0.08);
  --brand: #0b4b83;
  --success: #2c9a55;
}

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* ── Wrapper ──────────────────────────────────── */
.app-wrapper {
  max-width: 1600px;
  width: min(100%, 1600px);
  margin: 0 auto;
  padding: 0.65rem 1.5rem 1.5rem;
}

/* ── Navbar ───────────────────────────────────── */
.navbar {
  min-height: 50px;
  box-shadow: 0 2px 12px rgba(11, 41, 83, 0.15);
}

.navbar-brand {
  font-weight: 700;
  letter-spacing: 0.05em;
  font-size: 1.05rem;
}

.navbar-nav .nav-link {
  font-size: 0.9rem;
  padding-top: 0.35rem;
  padding-bottom: 0.35rem;
}

.navbar .form-select {
  min-width: 130px;
  max-width: 170px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: #ffffff;
  color: #1f2937;
  font-size: 0.85rem;
  padding-top: 0.2rem;
  padding-bottom: 0.2rem;
}

.navbar .form-select:focus {
  box-shadow: 0 0 0 0.15rem rgba(47, 154, 88, 0.2);
}

.language-label {
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.8);
  white-space: nowrap;
  margin-right: 0.3rem;
}

/* ── Cards (base) ─────────────────────────────── */
.card {
  border-radius: 0.9rem;
}

/* ── Hero Card ─────────────────────────────────── */
.hero-card {
  border: 1px solid var(--border);
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.07);
  background: linear-gradient(135deg, #ffffff 0%, #f8fbff 100%);
}

.hero-card .card-body {
  padding: 0.85rem 1.25rem;
}

.hero-icon-placeholder {
  font-size: 2rem;
  line-height: 1;
  opacity: 0.75;
}

.hero-title {
  font-size: clamp(1.05rem, 1.4vw, 1.5rem);
  line-height: 1.2;
  font-weight: 700;
  color: #1f2937;
}

.hero-copy {
  font-size: 0.83rem;
  line-height: 1.45;
  color: var(--muted);
}

.hero-info-box {
  background: #f0f6ff;
  border: 1px solid rgba(11, 75, 131, 0.13);
  border-radius: 0.75rem;
  padding: 0.6rem 0.9rem;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.3rem;
}

.info-item {
  display: flex;
  flex-direction: column;
}

.info-label {
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--muted);
  margin-bottom: 0.15rem;
}

.info-value {
  font-size: 1.1rem;
  color: #1f2937;
  font-weight: 700;
}

.info-value.display-6 {
  font-size: 1.9rem;
  line-height: 1;
  color: var(--brand);
}

/* ── Quiz Card ─────────────────────────────────── */
.quiz-card {
  border: 1px solid var(--border);
}

.quiz-header {
  background: #f3f4f6;
  padding: 0.5rem 1.1rem;
  border-bottom: 1px solid var(--border);
  border-radius: 0.9rem 0.9rem 0 0;
}

.quiz-header h5 {
  font-weight: 700;
  font-size: 0.95rem;
  color: #1f2937;
}

.quiz-card .card-body {
  padding: 0.8rem 1.1rem;
}

.quiz-prompt {
  font-size: 1.55rem;
  font-weight: 700;
  color: #1f2937;
  min-height: 1.8rem;
  display: flex;
  align-items: center;
  padding: 0.2rem 0;
}

/* ── Status Card ───────────────────────────────── */
.status-card {
  border: 1px solid var(--border);
}

.status-header {
  background: #f3f4f6;
  padding: 0.5rem 1.1rem;
  border-bottom: 1px solid var(--border);
  border-radius: 0.9rem 0.9rem 0 0;
}

.status-header h5 {
  font-weight: 700;
  font-size: 0.95rem;
  color: #1f2937;
}

.status-card .card-body {
  padding: 0.3rem 1.1rem 0.5rem;
}

.status-grid {
  display: flex;
  flex-direction: column;
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.38rem 0;
  border-bottom: 1px solid var(--border);
}

.status-row:last-child {
  border-bottom: none;
}

.status-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
}

.status-count {
  font-weight: 700;
  font-size: 1rem;
  color: #1f2937;
}

.status-count a { color: currentColor; }

/* ── Hard Words Card ───────────────────────────── */
.hard-words-card {
  border: 1px solid var(--border);
}

.hard-words-header {
  background: #f3f4f6;
  padding: 0.5rem 1.1rem;
  border-bottom: 1px solid var(--border);
  border-radius: 0.9rem 0.9rem 0 0;
}

.hard-words-header h5 {
  font-weight: 700;
  font-size: 0.95rem;
  color: #1f2937;
}

.hard-words-card .card-body {
  padding: 0.35rem 1.1rem 0.5rem;
}

/* ── Table ──────────────────────────────────────── */
.table th {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  border: none;
  padding: 0.35rem 0.4rem;
}

.table td {
  padding: 0.38rem 0.4rem;
  border: none;
  font-size: 0.87rem;
}

/* ── Buttons ────────────────────────────────────── */
.btn {
  border-radius: 0.5rem;
  font-weight: 600;
}

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

.btn-success:hover {
  background-color: #267346;
  border-color: #267346;
}

/* ── Alert ──────────────────────────────────────── */
.alert {
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
}

.alert-info {
  background: #eef5ff;
  border-color: rgba(13, 110, 253, 0.18);
  color: #0a3f7d;
}

/* ── Responsive ─────────────────────────────────── */
@media (max-width: 1399.98px) {
  .app-wrapper {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
}

@media (max-width: 991.98px) {
  .navbar .form-select { min-width: 120px; }
  .language-label { display: none; }
  .hero-card .card-body { padding: 0.75rem 1rem; }
  .quiz-card { height: auto; }
}

@media (max-width: 767.98px) {
  .app-wrapper { padding: 0.5rem 0.75rem 1.5rem; }
  .hero-title { font-size: 1.1rem; }
  .hero-icon-placeholder { display: none; }
}