:root {
  --bg: #f3f5f9;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --border: #dde3ec;
  --text: #162033;
  --text-muted: #5a677d;
  --primary: #1d4ed8;
  --primary-hover: #1e40af;
  --primary-soft: #eff6ff;
  --success: #15803d;
  --success-bg: #dcfce7;
  --success-border: #86efac;
  --danger: #b91c1c;
  --danger-bg: #fee2e2;
  --danger-border: #fca5a5;
  --warn: #b45309;
  --warn-bg: #fef3c7;
  --radius: 12px;
  --shadow: 0 2px 10px rgba(15, 23, 42, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;
}

body {
  margin: 0;
  font-family: 'Noto Sans Armenian', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

button,
input,
select,
label {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
  padding-top: env(safe-area-inset-top);
}

.header-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px max(16px, env(safe-area-inset-right)) 8px max(16px, env(safe-area-inset-left));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand > div {
  min-width: 0;
}

.brand-badge {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  display: grid;
  place-items: center;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.brand-title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
}

.brand-subtitle {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.tab-nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 max(16px, env(safe-area-inset-right)) 0 max(16px, env(safe-area-inset-left));
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.tab-nav::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  appearance: none;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 10px 14px;
  min-height: 44px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.badge {
  background: var(--danger-bg);
  color: var(--danger);
  font-size: 12px;
  font-weight: 700;
  padding: 1px 8px;
  border-radius: 999px;
  min-width: 24px;
  text-align: center;
}

.badge.zero {
  background: var(--surface-alt);
  color: var(--text-muted);
}

.app-main {
  max-width: 1080px;
  margin: 20px auto 28px;
  padding: 0 max(16px, env(safe-area-inset-right)) 0 max(16px, env(safe-area-inset-left));
}

.app-footer {
  max-width: 1080px;
  margin: 0 auto max(28px, env(safe-area-inset-bottom));
  padding: 0 max(16px, env(safe-area-inset-right)) 0 max(16px, env(safe-area-inset-left));
}

.footer-inner {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 13px;
  color: var(--text-muted);
}

.visit-stats {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 12px;
  color: var(--text-muted);
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  min-width: 0;
  overflow-wrap: break-word;
}

.card + .card {
  margin-top: 16px;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 15px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: background 0.15s, border-color 0.15s, transform 0.05s;
}

.btn:hover:not(:disabled) {
  background: var(--surface-alt);
  border-color: #c2ccd9;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.48;
  cursor: not-allowed;
}

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

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

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

.btn-danger:hover:not(:disabled) {
  background: #fecaca;
}

.btn-ghost {
  background: var(--surface-alt);
}

.btn-sm {
  padding: 6px 11px;
  font-size: 13px;
}

.import-label {
  cursor: pointer;
}

/* Group selector pills */
.group-pills {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.group-pill {
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 12px;
  cursor: pointer;
  font: inherit;
  transition: border-color 0.15s, background 0.15s;
}

.group-pill:hover {
  border-color: #b7c4d8;
}

.group-pill.active {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.group-pill-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 14px;
}

.group-pill-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
  display: flex;
  justify-content: space-between;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.progress-bar-wrap {
  width: 100%;
  height: 8px;
  background: var(--surface-alt);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
  margin-bottom: 16px;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.2s ease;
}

/* Question Card */
.question-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.pill-tag {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 10px;
  font-weight: 600;
  color: var(--text);
  font-size: 12px;
}

.pill-tag.danger {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger);
}

.pill-tag.success {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success);
}

.question-text {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 16px;
  line-height: 1.55;
  overflow-wrap: break-word;
}

.question-images {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.question-img-btn {
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  cursor: zoom-in;
  overflow: hidden;
  max-width: 100%;
  display: inline-block;
}

.question-img-btn img {
  display: block;
  max-width: 100%;
  max-height: 300px;
  width: auto;
  height: auto;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-btn {
  width: 100%;
  min-height: 46px;
  text-align: left;
  background: var(--surface-alt);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
  font-size: 15px;
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  overflow-wrap: break-word;
  transition: border-color 0.15s, background 0.15s;
}

.option-btn > span:last-child {
  min-width: 0;
  overflow-wrap: break-word;
}

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

.option-btn:disabled {
  cursor: default;
}

.option-num {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}

.option-btn.selected {
  border-color: var(--primary);
  background: var(--primary-soft);
}

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

.option-btn.correct {
  border-color: var(--success-border);
  background: var(--success-bg);
  color: #14532d;
}

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

.option-btn.wrong {
  border-color: var(--danger-border);
  background: var(--danger-bg);
  color: #7f1d1d;
}

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

.feedback-banner {
  margin-top: 14px;
  padding: 11px 14px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.feedback-banner.correct {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success);
}

.feedback-banner.wrong {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger);
}

.explanation-box {
  margin-top: 12px;
  border: 1px solid #bfdbfe;
  background: #f8fbff;
  border-radius: 10px;
  overflow: hidden;
}

.explanation-toggle {
  width: 100%;
  appearance: none;
  background: #eff6ff;
  border: none;
  padding: 10px 14px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  text-align: left;
}

.explanation-toggle:hover {
  background: #dbeafe;
}

.explanation-content {
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  border-top: 1px solid #dbeafe;
}

.question-footer {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.kbd-hint {
  font-size: 12px;
  color: var(--text-muted);
}

/* Question jump grid */
.q-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.q-dot {
  width: 34px;
  height: 30px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--surface);
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
}

.q-dot:hover {
  border-color: var(--primary);
}

.q-dot.current {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
  color: var(--text);
}

.q-dot.correct {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success);
}

.q-dot.wrong {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger);
}

.q-dot.answered {
  background: var(--primary-soft);
  border-color: #93c5fd;
  color: var(--primary);
}

/* Exam Timer & Breakdown */
.exam-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.timer-pill {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 16px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid #bfdbfe;
}

.timer-pill.warn {
  background: var(--warn-bg);
  color: var(--warn);
  border-color: #fcd34d;
}

.timer-pill.danger {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: var(--danger-border);
}

.exam-result-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.result-score {
  font-size: 32px;
  font-weight: 700;
  margin: 4px 0;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-alt);
  font-size: 14px;
}

/* Search tab */
.search-controls {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto auto;
  gap: 10px;
  align-items: center;
}

.input,
.select {
  font: inherit;
  font-size: 15px;
  min-height: 42px;
  max-width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
}

.input:focus,
.select:focus {
  outline: 2px solid #93c5fd;
  border-color: var(--primary);
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
}

.search-result-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  min-width: 0;
  overflow-wrap: break-word;
}

.pagination-bar {
  margin-top: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.search-result-card + .search-result-card {
  margin-top: 12px;
}

.search-options {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.search-options li {
  padding: 7px 11px;
  border-radius: 8px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  font-size: 14px;
}

.search-options li.is-correct {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: #14532d;
  font-weight: 600;
}

/* Lightbox */
.lightbox[hidden] {
  display: none;
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.82);
  display: grid;
  place-items: center;
  z-index: 100;
  padding: 20px;
}

.lightbox-img {
  max-width: 94vw;
  max-height: 84dvh;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  object-fit: contain;
}

.lightbox-close {
  position: fixed;
  top: max(16px, env(safe-area-inset-top));
  right: max(16px, env(safe-area-inset-right));
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: none;
  background: rgba(255, 255, 255, 0.94);
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
}

.toast[hidden] {
  display: none;
}

.toast {
  position: fixed;
  bottom: max(20px, env(safe-area-inset-bottom));
  right: max(20px, env(safe-area-inset-right));
  background: #1e293b;
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  z-index: 90;
}

.empty-state {
  text-align: center;
  padding: 36px 16px;
  color: var(--text-muted);
}

.empty-state h2 {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 20px;
}

/* Road Signs tab */
.signs-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.sign-cat-pill {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  border-radius: 14px;
  padding: 7px 12px;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  text-align: left;
  max-width: 100%;
  overflow-wrap: break-word;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.sign-cat-pill:hover {
  border-color: var(--primary);
}

.sign-cat-pill.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.signs-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 360px), 1fr));
  gap: 12px;
}

.sign-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  min-width: 0;
}

.sign-thumb-btn {
  width: 112px;
  height: 112px;
  flex-shrink: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  padding: 8px;
  display: grid;
  place-items: center;
  cursor: zoom-in;
}

.sign-thumb-btn img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
}

.sign-body {
  min-width: 0;
  flex: 1;
}

.sign-body .pill-tag {
  display: inline-block;
  border-radius: 8px;
  line-height: 1.35;
}

.sign-title {
  margin: 4px 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
}

.sign-desc {
  margin: 0;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.55;
}

/* iPad / Tablet (<= 1024px) */
@media (max-width: 1024px) {
  .input,
  .select {
    font-size: 16px; /* prevents iOS/iPadOS auto-zoom on focus */
  }

  .group-pills {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .search-controls {
    grid-template-columns: minmax(0, 1fr) auto auto;
  }

  .search-controls .input {
    grid-column: 1 / -1;
  }

  .q-grid {
    max-height: 220px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 4px 2px;
  }

  .q-dot {
    min-width: 38px;
    height: 36px;
  }
}

/* Mobile & small tablets (<= 760px) */
@media (max-width: 760px) {
  .header-inner {
    padding: 10px max(12px, env(safe-area-inset-right)) 6px max(12px, env(safe-area-inset-left));
    gap: 8px;
  }

  .brand-badge {
    width: 34px;
    height: 34px;
    font-size: 12px;
  }

  .brand-title {
    font-size: 16px;
  }

  .brand-subtitle {
    font-size: 12px;
  }

  .tab-nav {
    padding: 0 max(10px, env(safe-area-inset-right)) 0 max(10px, env(safe-area-inset-left));
    gap: 2px;
  }

  .tab-btn {
    padding: 9px 11px;
    font-size: 13px;
  }

  .app-main {
    margin: 12px auto max(36px, env(safe-area-inset-bottom));
    padding: 0 max(12px, env(safe-area-inset-right)) 0 max(12px, env(safe-area-inset-left));
  }

  .card {
    padding: 14px;
  }

  .group-pills {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
    margin-bottom: 12px;
  }

  .group-pill {
    padding: 8px 10px;
  }

  .group-pill-top {
    font-size: 13px;
  }

  .search-controls {
    grid-template-columns: 1fr;
  }

  .signs-list {
    grid-template-columns: 1fr;
  }

  .signs-filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
  }

  .signs-filters::-webkit-scrollbar {
    display: none;
  }

  .sign-cat-pill {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .sign-card {
    flex-direction: column;
    align-items: stretch;
  }

  .sign-thumb-btn {
    width: 100%;
    height: 140px;
  }

  .question-text {
    font-size: 16px;
  }

  .option-btn {
    padding: 11px 12px;
    font-size: 14.5px;
  }

  .question-footer .toolbar-group {
    width: 100%;
  }

  .question-footer .toolbar-group .btn {
    flex: 1;
    min-height: 44px;
  }

  .kbd-hint {
    display: none;
  }

  .toast {
    left: max(12px, env(safe-area-inset-left));
    right: max(12px, env(safe-area-inset-right));
    bottom: max(14px, env(safe-area-inset-bottom));
    text-align: center;
  }
}

/* Very small phones (<= 400px) */
@media (max-width: 400px) {
  .header-actions {
    width: 100%;
  }

  .header-actions .btn {
    flex: 1;
  }
}