/* ---------------- Base Themes ---------------- */
:root {
  --bg-color: #f8fafc;
  --text-color: #0f172a;
  --hint-color: #64748b;
  --link-color: #2563eb;
  --button-color: #2563eb;
  --button-text-color: #ffffff;
  --secondary-bg-color: #ffffff;
  --card-border: #e2e8f0;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  --success-color: #16a34a;
  --danger-color: #dc2626;
  --warning-color: #d97706;
  --active-chip-bg: #2563eb;
  --active-chip-color: #ffffff;
}

body.theme-dark {
  --bg-color: #0f172a;
  --text-color: #f8fafc;
  --hint-color: #94a3b8;
  --link-color: #38bdf8;
  --button-color: #38bdf8;
  --button-text-color: #0f172a;
  --secondary-bg-color: #1e293b;
  --card-border: #334155;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  --success-color: #22c55e;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --active-chip-bg: #38bdf8;
  --active-chip-color: #0f172a;
}

/* Telegram theme integration fallback if user prefers auto */
@media (prefers-color-scheme: dark) {
  :root:not(.theme-forced-light) {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --hint-color: #94a3b8;
    --link-color: #38bdf8;
    --button-color: #38bdf8;
    --button-text-color: #0f172a;
    --secondary-bg-color: #1e293b;
    --card-border: #334155;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --active-chip-bg: #38bdf8;
    --active-chip-color: #0f172a;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  padding-bottom: 80px;
  min-height: 100vh;
  user-select: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 16px;
}

/* ---------------- Header ---------------- */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-top: 4px;
}
.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}
.app-header h1 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.badge-user {
  background: var(--secondary-bg-color);
  color: var(--hint-color);
  font-size: 13px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
}

.theme-btn {
  background: var(--secondary-bg-color);
  border: 1px solid var(--card-border);
  color: var(--text-color);
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}
.theme-btn:active {
  transform: scale(0.92);
}
.theme-icon {
  width: 18px;
  height: 18px;
  stroke: var(--text-color);
}

/* ---------------- Cards & Layout ---------------- */
.card {
  background: var(--secondary-bg-color);
  border-radius: 16px;
  padding: 18px;
  margin-bottom: 16px;
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
  transition: all 0.2s ease;
}

.field-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--hint-color);
  display: block;
  margin-bottom: 8px;
  text-transform: uppercase;
}

/* ---------------- Question Count Selector ---------------- */
.chip-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-bottom: 12px;
}
.chip {
  padding: 10px 4px;
  text-align: center;
  background: var(--bg-color);
  border: 1.5px solid var(--card-border);
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  color: var(--text-color);
  transition: all 0.15s ease;
}
.chip.active {
  border-color: var(--button-color);
  background: var(--active-chip-bg);
  color: var(--active-chip-color);
}
.chip:active {
  transform: scale(0.96);
}

.custom-count-box {
  background: var(--bg-color);
  border: 1.5px solid var(--card-border);
  border-radius: 12px;
  padding: 10px 14px;
  margin-bottom: 16px;
}
.custom-count-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.custom-count-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-color);
}
.custom-count-input-wrap {
  width: 100px;
}
.custom-count-input {
  width: 100%;
  padding: 8px 10px;
  background: var(--secondary-bg-color);
  border: 1.5px solid var(--card-border);
  border-radius: 8px;
  color: var(--text-color);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  outline: none;
  transition: border-color 0.15s ease;
}
.custom-count-input:focus {
  border-color: var(--button-color);
}
.custom-count-hint {
  font-size: 11px;
  color: var(--hint-color);
  margin-top: 4px;
}

/* ---------------- Option Items ---------------- */
.option-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-color);
  border: 1.5px solid var(--card-border);
  border-radius: 14px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 15px;
  line-height: 1.4;
  color: var(--text-color);
}
.option-item:active {
  transform: scale(0.98);
}
.option-item.selected {
  border-color: var(--button-color);
  background: rgba(37, 99, 235, 0.08);
}
body.theme-dark .option-item.selected {
  background: rgba(56, 189, 248, 0.12);
}
.option-item.correct {
  border-color: var(--success-color);
  background: rgba(22, 163, 74, 0.12);
  color: var(--success-color);
  font-weight: 600;
}
.option-item.incorrect {
  border-color: var(--danger-color);
  background: rgba(220, 38, 38, 0.12);
  color: var(--danger-color);
}

.checkbox-box, .radio-box {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 2px solid var(--hint-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s ease;
}
.radio-box {
  border-radius: 50%;
}
.option-item.selected .checkbox-box,
.option-item.selected .radio-box {
  border-color: var(--button-color);
  background: var(--button-color);
  color: var(--button-text-color);
}

/* ---------------- Progress Bar ---------------- */
.progress-container {
  width: 100%;
  height: 8px;
  background: var(--secondary-bg-color);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 16px;
  border: 1px solid var(--card-border);
}
.progress-bar {
  height: 100%;
  background: var(--button-color);
  width: 0%;
  transition: width 0.3s ease;
}

/* ---------------- Buttons ---------------- */
.btn-primary {
  width: 100%;
  padding: 14px;
  background: var(--button-color);
  color: var(--button-text-color);
  border: none;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.1s ease;
  margin-top: 10px;
}
.btn-primary:active {
  transform: scale(0.98);
  opacity: 0.9;
}
.btn-secondary {
  width: 100%;
  padding: 12px;
  background: transparent;
  color: var(--button-color);
  border: 1.5px solid var(--button-color);
  border-radius: 14px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 10px;
  transition: background-color 0.15s ease;
}
.btn-secondary:active {
  transform: scale(0.98);
  background: rgba(37, 99, 235, 0.05);
}

/* ---------------- Inputs ---------------- */
.text-input {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-color);
  border: 1.5px solid var(--card-border);
  border-radius: 14px;
  color: var(--text-color);
  font-size: 16px;
  outline: none;
  margin-bottom: 12px;
  transition: border-color 0.15s ease;
}
.text-input:focus {
  border-color: var(--button-color);
}

/* ---------------- Feedback Alert ---------------- */
.feedback-box {
  padding: 14px;
  border-radius: 12px;
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.4;
  animation: fadeIn 0.2s ease;
}
.feedback-box.correct {
  background: rgba(22, 163, 74, 0.15);
  color: var(--success-color);
  border: 1px solid var(--success-color);
}
.feedback-box.incorrect {
  background: rgba(220, 38, 38, 0.15);
  color: var(--danger-color);
  border: 1px solid var(--danger-color);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------------- Bottom Navigation ---------------- */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 65px;
  background: var(--secondary-bg-color);
  border-top: 1px solid var(--card-border);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 100;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.04);
}
.nav-tab {
  background: transparent;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--hint-color);
  cursor: pointer;
  transition: color 0.15s ease, transform 0.15s ease;
  flex: 1;
  height: 100%;
}
.nav-icon-svg {
  width: 22px;
  height: 22px;
  stroke: var(--hint-color);
  transition: stroke 0.15s ease, transform 0.15s ease;
}
.nav-tab.active {
  color: var(--button-color);
}
.nav-tab.active .nav-icon-svg {
  stroke: var(--button-color);
  transform: scale(1.08);
}
.nav-tab:active {
  transform: scale(0.94);
}

/* ---------------- Accordion (Catalog & Reviews) ---------------- */
.accordion-item {
  background: var(--secondary-bg-color);
  border-radius: 12px;
  margin-bottom: 10px;
  overflow: hidden;
  border: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
}
.accordion-header {
  padding: 14px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-color);
}
.accordion-body {
  padding: 14px;
  border-top: 1px solid var(--card-border);
  font-size: 14px;
  background: var(--bg-color);
}

/* ---------------- History List & Cards ---------------- */
.history-item-card {
  background: var(--secondary-bg-color);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: var(--card-shadow);
}
.history-item-card:hover, .history-item-card:active {
  transform: scale(0.99);
  border-color: var(--button-color);
}
.history-card-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.history-card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-color);
}
.history-card-subtitle {
  font-size: 12px;
  color: var(--hint-color);
}
.history-card-right {
  display: flex;
  align-items: center;
  gap: 10px;
}
.history-score-badge {
  font-size: 15px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 10px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--button-color);
}
.history-score-badge.high {
  background: rgba(22, 163, 74, 0.12);
  color: var(--success-color);
}
.history-score-badge.low {
  background: rgba(220, 38, 38, 0.12);
  color: var(--danger-color);
}
.history-chevron {
  width: 18px;
  height: 18px;
  stroke: var(--hint-color);
}

/* ---------------- History Detail Modal ---------------- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}
@media (min-width: 600px) {
  .modal-overlay {
    align-items: center;
    padding: 20px;
  }
}
.modal-card {
  background: var(--bg-color);
  width: 100%;
  max-width: 600px;
  max-height: 85vh;
  border-radius: 20px 20px 0 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--card-border);
  animation: slideUp 0.25s ease;
}
@media (min-width: 600px) {
  .modal-card {
    border-radius: 20px;
    max-height: 80vh;
  }
}
@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}
.modal-header {
  padding: 18px 20px;
  background: var(--secondary-bg-color);
  border-bottom: 1px solid var(--card-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.modal-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-color);
}
.modal-subtitle {
  font-size: 12px;
  color: var(--hint-color);
  margin-top: 2px;
}
.modal-close {
  background: var(--bg-color);
  border: 1px solid var(--card-border);
  width: 32px;
  height: 32px;
  border-radius: 10px;
  color: var(--hint-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}
.modal-close:active {
  transform: scale(0.92);
}
.modal-body {
  padding: 16px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  flex: 1;
}

.modal-q-item {
  background: var(--secondary-bg-color);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 14px;
  margin-bottom: 12px;
}
.modal-q-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}
.modal-q-text {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-color);
}
.modal-status-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 8px;
  flex-shrink: 0;
}
.modal-status-badge.correct {
  background: rgba(22, 163, 74, 0.15);
  color: var(--success-color);
}
.modal-status-badge.incorrect {
  background: rgba(220, 38, 38, 0.15);
  color: var(--danger-color);
}
.modal-q-options {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.modal-opt {
  font-size: 13px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--bg-color);
  border: 1px solid var(--card-border);
  color: var(--text-color);
}
.modal-opt.is-correct {
  border-color: var(--success-color);
  background: rgba(22, 163, 74, 0.12);
  color: var(--success-color);
  font-weight: 600;
}

/* ---------------- New Components: Categories, Bookmarks, Search ---------------- */
.form-select {
  width: 100%;
  padding: 12px 14px;
  background-color: var(--bg-color);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  color: var(--text-color);
  font-size: 14px;
  font-weight: 500;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg2+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 16px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-select:focus {
  border-color: var(--button-color);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.category-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--button-color);
  letter-spacing: 0.01em;
  max-width: 200px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.badge-mini {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 10px;
  background: var(--card-border);
  color: var(--text-color);
  margin-left: 4px;
}
.option-item.selected .badge-mini {
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

/* 4-item mode grid */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 20px;
}
.mode-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 12px 10px;
  background: var(--bg-color);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.mode-card:hover {
  border-color: var(--button-color);
}
.mode-card.selected {
  background: var(--button-color);
  border-color: var(--button-color);
  color: #ffffff !important;
}
.mode-card.selected strong,
.mode-card.selected div,
.mode-card.selected span {
  color: #ffffff !important;
}
.mode-card strong {
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.mode-card .mode-desc {
  font-size: 11px;
  color: var(--hint-color);
  margin-top: 2px;
}

/* Bookmark Button */
.btn-icon-bookmark {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  color: var(--hint-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, color 0.15s ease;
}
.btn-icon-bookmark:active {
  transform: scale(1.25);
}
.btn-icon-bookmark.bookmarked {
  color: #eab308;
}
.btn-icon-bookmark svg {
  width: 18px;
  height: 18px;
  transition: fill 0.2s ease, stroke 0.2s ease;
}
.btn-icon-bookmark.bookmarked svg {
  fill: #eab308;
  stroke: #eab308;
}

/* Search bar with icon and clear */
.search-box {
  position: relative;
  display: flex;
  align-items: center;
  margin-bottom: 10px;
}
.search-icon {
  position: absolute;
  left: 12px;
  width: 16px;
  height: 16px;
  stroke: var(--hint-color);
  pointer-events: none;
}
.search-input {
  padding-left: 36px !important;
  padding-right: 32px !important;
}
.search-clear-btn {
  position: absolute;
  right: 10px;
  background: var(--card-border);
  border: none;
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-size: 10px;
  color: var(--hint-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Horizontal chips filter */
.filter-chips-scroll {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.filter-chips-scroll::-webkit-scrollbar {
  display: none;
}
.filter-chips-scroll .chip {
  flex-shrink: 0;
  font-size: 13px;
  padding: 6px 12px;
}

/* Profile Action Card */
.profile-btn-action {
  font-size: 12px;
  font-weight: 600;
  color: var(--button-color);
  background: none;
  border: none;
  cursor: pointer;
  margin-top: 6px;
  text-decoration: underline;
  padding: 0;
}