/* ══════════════════════════════════════════════════════════════
   EPUB Reader — Reusable UI Component Library
   Centralized Design System Components (Cards, Buttons, Popups,
   Sliders, Pickers, Dropdowns, Toggles, Toasts, Icons)
   ══════════════════════════════════════════════════════════════ */

/* ── 1. CARDS & PANELS ──────────────────────────────────────── */
.vo-card,
.ui-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  padding: 16px 18px;
  margin-bottom: 10px;
  backdrop-filter: blur(8px);
  position: relative;
}

.vo-card:has(.vo-custom-select.open),
.ui-card:has(.vo-custom-select.open) {
  z-index: 9999;
}

.vo-section-label,
.ui-section-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 12px;
  padding-left: 2px;
}

.vo-sub-note,
.ui-sub-note {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: -6px;
  margin-bottom: 12px;
  opacity: 0.85;
  padding-left: 2px;
  line-height: 1.4;
  font-style: italic;
}

.vo-sub-note.hidden,
.ui-sub-note.hidden {
  display: none !important;
}

.vo-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.vo-card-header .vo-section-label {
  margin-bottom: 0 !important;
}

.vo-reset-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all 0.15s ease;
  user-select: none;
}

.vo-reset-link:hover {
  color: var(--accent);
  background: var(--accent-transparent);
}

.vo-reset-link .material-icons-round {
  font-size: 13px;
}

.vo-row,
.ui-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 40px;
  padding: 4px 0;
  position: relative;
}

.vo-row:has(.vo-custom-select.open) {
  z-index: 100;
}

.vo-row + .vo-row {
  border-top: 1px solid var(--border-light);
}

.vo-row-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  flex: 1;
  min-width: 0;
  margin-right: 12px;
  line-height: 1.25;
  word-wrap: break-word;
}

.vo-row-value {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  justify-content: flex-end;
  min-width: 0;
}

.vo-divider,
.ui-divider {
  height: 1px;
  background: var(--border-light);
  margin: 14px 0;
}

/* Standard Icon Button */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition, 0.2s ease);
  user-select: none;
  text-decoration: none;
}

.icon-btn:hover {
  background: var(--glass-bg-hover, var(--surface-hover));
  color: var(--text);
}

.icon-btn .material-icons-round {
  font-size: 22px;
}

/* Primary & Outline Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--accent);
  color: var(--color-white, #fff);
  padding: 10px 20px;
  border-radius: var(--radius-sm, 8px);
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition, 0.2s ease);
  user-select: none;
}

.btn-primary:hover {
  background: var(--accent-hover, var(--accent));
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-shadow);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: transparent;
  color: var(--accent);
  padding: 9px 18px;
  border-radius: var(--radius-sm, 8px);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--accent);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition, 0.2s ease);
  user-select: none;
}

.btn-outline:hover {
  background: var(--accent);
  color: var(--color-white, #fff);
  transform: translateY(-1px);
}

.btn-outline.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
}

.btn-outline .material-icons-round,
.btn-primary .material-icons-round {
  font-size: 18px;
}

/* Navigation Buttons (Reader chapter nav) */
.nav-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  background: var(--glass-bg, var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--radius, 12px);
  text-decoration: none;
  color: var(--text);
  transition: all var(--transition, 0.2s ease);
  user-select: none;
}

.nav-btn:not(.disabled):hover {
  background: var(--glass-bg-hover, var(--surface-hover));
  border-color: var(--accent);
  transform: translateY(-2px);
}

.nav-btn.disabled {
  opacity: 0.3;
  cursor: default;
}

.nav-btn.nav-next {
  justify-content: flex-end;
  text-align: right;
}

.nav-btn .material-icons-round {
  color: var(--accent);
  font-size: 22px;
  flex-shrink: 0;
}

/* Theme & UI Choice Buttons */
.theme-buttons,
.ui-button-group {
  display: flex;
  gap: 8px;
}

.theme-btn,
.ui-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 8px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm, 8px);
  background: var(--glass-bg, var(--surface));
  color: var(--text);
  font-size: 12px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition, 0.2s ease);
  flex: 1;
  min-width: 0;
  user-select: none;
}

.theme-btn:hover,
.ui-btn:hover {
  border-color: var(--accent);
  background: var(--glass-bg-hover, var(--surface-hover));
  transform: translateY(-1px);
}

.theme-btn.active,
.ui-btn.active {
  background: var(--accent);
  color: var(--color-white, #fff);
  border-color: var(--accent);
  box-shadow: 0 4px 12px var(--accent-shadow);
}

/* Individual Theme Swatch Buttons */
.theme-btn[data-theme="dark"] {
  background: var(--swatch-bg-dark, #0f1118);
  color: var(--swatch-off-white, #e4e6ed);
  border-color: var(--border);
}

.theme-btn[data-theme="light"] {
  background: var(--swatch-bg-light, #f5f6fa);
  color: #1a1c26;
  border-color: var(--border);
}

.theme-btn[data-theme="sepia"] {
  background: var(--swatch-bg-sepia, #f4ecd8);
  color: var(--swatch-sepia-dark, #5c4a2f);
  border-color: var(--border);
}

.theme-btn[data-theme]:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.theme-btn[data-theme].active {
  border-color: var(--accent) !important;
  background: var(--accent) !important;
  color: var(--color-white, #fff) !important;
  box-shadow: 0 4px 12px var(--accent-shadow);
}

.theme-btn .material-icons-round,
.ui-btn .material-icons-round {
  font-size: 16px;
}

/* Plus/Minus Buttons */
.vo-pm-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  min-width: 26px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--accent);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  font-family: inherit;
  flex-shrink: 0;
  padding: 0;
  line-height: 1;
}

.vo-pm-btn:hover {
  background: var(--accent-transparent);
}

.vo-pm-btn:active {
  transform: scale(0.9);
}

/* Reset Action Buttons */
.vo-reset-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
  padding-top: 4px;
}

.vo-reset-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.vo-reset-btn:hover {
  background: var(--glass-bg-hover);
  color: var(--text);
  border-color: var(--accent);
}

.btn-reset {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px;
  background: var(--color-danger-bg);
  border: 1px solid var(--color-danger);
  color: var(--color-danger);
  border-radius: 12px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-reset:hover {
  background: var(--color-danger);
  color: var(--color-white);
}

.toast-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  padding: 4px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  margin-left: 12px;
  transition: all 0.2s ease;
}

.toast-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: white;
}

/* ── 16. CUSTOM DIALOGS (Alert, Confirm, Prompt) ────────────── */
.vo-dialog-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.vo-dialog-overlay.show {
  opacity: 1;
  visibility: visible;
}

.vo-dialog {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  width: 90%;
  max-width: 400px;
  box-shadow: var(--shadow-popover);
  transform: translateY(20px) scale(0.95);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.vo-dialog-overlay.show .vo-dialog {
  transform: translateY(0) scale(1);
}

.vo-dialog-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.vo-dialog-message {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

.vo-dialog-input {
  width: 100%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s ease;
}

.vo-dialog-input:focus {
  border-color: var(--accent);
}

.vo-dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 8px;
}

.vo-dialog-btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  outline: none;
}

.vo-dialog-btn-cancel {
  background: transparent;
  color: var(--text-secondary);
}
.vo-dialog-btn-cancel:hover {
  background: var(--glass-bg-hover);
  color: var(--text);
}

.vo-dialog-btn-confirm {
  background: var(--accent);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}
.vo-dialog-btn-confirm:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}


/* ── 3. SLIDERS & READ-OUTS ────────────────────────────────── */
.vo-slider-row {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 170px;
  min-width: 170px;
  flex-shrink: 0;
  overflow: visible;
  flex-wrap: nowrap;
}

.vo-slider-row .vo-range-value {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  min-width: 28px;
  text-align: right;
  user-select: none;
}

/* ── 9. MODALS & PANELS (PHASE 3) ──────────────────────────── */
.interactive-panel {
  margin-top: 20px;
  padding: 15px;
  background: var(--surface);
  border-radius: var(--radius, 12px);
  border: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

.rating-box {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.rating-box-title {
  font-size: 0.9rem;
  color: var(--text-secondary);
  user-select: none;
}

.stars {
  color: var(--border);
  font-size: 24px;
  cursor: pointer;
  display: flex;
  gap: 2px;
}

.star-btn {
  transition: color var(--transition);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal-content {
  background: var(--bg);
  padding: 24px;
  border-radius: var(--radius-lg, 16px);
  width: 90%;
  max-width: 400px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-popover);
}

.modal-title {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.2rem;
}

.modal-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.modal-select {
  width: 100%;
  padding: 12px;
  margin-bottom: 20px;
  border-radius: var(--radius-sm, 8px);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  font-family: inherit;
  font-size: 0.95rem;
}

.modal-select:focus {
  outline: none;
  border-color: var(--accent);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

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

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

.vo-slider-row .vo-val {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  width: 44px;
  min-width: 44px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  user-select: none;
}

.vo-slider {
  flex: 1;
  min-width: 0;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border-light);
  border-radius: 2px;
  outline: none;
  position: relative;
}

.vo-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-white);
  cursor: pointer;
  box-shadow:
    0 0 0 2px var(--accent-transparent),
    var(--shadow);
  transition: box-shadow 0.15s ease;
}

.vo-slider::-webkit-slider-thumb:hover {
  box-shadow:
    0 0 0 4px var(--accent-shadow),
    var(--shadow);
}

.vo-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-white);
  border: none;
  cursor: pointer;
  box-shadow:
    0 0 0 2px var(--accent-transparent),
    var(--shadow);
}

/* ── 4. DROPDOWN SELECT ────────────────────────────────────── */
.vo-custom-select {
  position: relative;
  width: 100%;
  box-sizing: border-box;
}

.vo-select-trigger {
  box-sizing: border-box;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  transition: all 0.2s ease;
  outline: none;
}

.vo-select-trigger:hover {
  border-color: var(--accent);
  background: var(--glass-bg-hover);
}

.vo-select-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-popover);
  max-height: 220px;
  overflow-y: auto;
  z-index: 1000;
  display: none;
  padding: 6px;
  backdrop-filter: blur(16px);
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) transparent;
}

.vo-custom-select.drop-up .vo-select-dropdown {
  top: auto;
  bottom: calc(100% + 6px);
  box-shadow: var(--shadow-popover);
}

.vo-custom-select.open {
  z-index: 999;
}

.vo-custom-select.open .vo-select-dropdown {
  display: block;
  animation: voSelectFadeIn 0.15s ease-out;
}

@keyframes voSelectFadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.vo-select-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s ease;
}

.vo-select-option:hover {
  background: var(--glass-bg-hover);
}

.vo-select-option.active {
  background: var(--accent-transparent);
  color: var(--accent);
  font-weight: 600;
}

.vo-select-option .check-icon {
  font-size: 18px;
  color: var(--accent);
  display: none;
}

.vo-select-option.active .check-icon {
  display: inline-block;
}

/* ── 5. TOGGLE SWITCH ──────────────────────────────────────── */
.vo-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.vo-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.vo-toggle-track {
  position: absolute;
  inset: 0;
  border-radius: 12px;
  background: var(--toggle-track-off);
  cursor: pointer;
  transition: background 0.25s ease;
}

.vo-toggle-track::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--toggle-thumb-off);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.vo-toggle input:checked + .vo-toggle-track {
  background: var(--accent);
}

.vo-toggle input:checked + .vo-toggle-track::after {
  transform: translateX(20px);
  background: var(--toggle-thumb-on);
}

/* ── 6. COLOR PICKER & PRESET CHIPS ───────────────────────── */
.vo-color-swatch {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: border-color 0.15s ease;
  position: relative;
  overflow: hidden;
}

.vo-color-swatch:hover {
  border-color: var(--accent);
}

.vo-color-swatch input[type="color"] {
  position: absolute;
  inset: -8px;
  width: calc(100% + 16px);
  height: calc(100% + 16px);
  border: none;
  cursor: pointer;
  opacity: 0;
}

.vo-color-hex-box {
  display: flex;
  align-items: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  padding: 6px 10px;
  transition: all 0.15s ease;
}

.vo-color-hex-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-transparent);
}

.vo-color-hex-box .hash {
  font-family: monospace;
  font-size: 13px;
  color: var(--text-secondary);
  user-select: none;
  margin-right: 2px;
}

.vo-color-hex-input {
  border: none;
  background: transparent;
  color: var(--text);
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
  font-size: 13px;
  font-weight: 600;
  width: 60px;
  outline: none;
  text-transform: uppercase;
}

.vo-preset-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
  padding: 8px 6px;
  margin-left: -6px;
  margin-right: -6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.vo-preset-bar::-webkit-scrollbar {
  display: none;
}

.vo-preset-chip {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid var(--glass-border);
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
  padding: 0;
  position: relative;
  box-sizing: border-box;
}

.vo-preset-chip:hover {
  transform: scale(1.12);
  border-color: var(--accent);
}

.vo-preset-chip.active {
  transform: scale(1.12);
  border-color: var(--accent);
  box-shadow: 0 0 0 2.5px var(--accent);
}

/* ── 7. POPUPS & MODALS ────────────────────────────────────── */
.vo-color-popover {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  width: 290px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-popover);
  z-index: 2000;
  display: none;
  opacity: 0;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 16px;
  backdrop-filter: blur(20px);
  color: var(--text);
}

.vo-color-popover.open {
  display: block;
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.vo-popover-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.vo-popover-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.vo-popover-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border-radius: 50%;
  transition: background 0.15s ease;
}

.vo-popover-close:hover {
  background: var(--glass-bg-hover);
  color: var(--text);
}

.vo-color-preview-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 10px;
  border-radius: 12px;
  margin-bottom: 12px;
}

.vo-preview-box {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
}

.vo-preview-details {
  display: flex;
  flex-direction: column;
}

.vo-preview-hex {
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

.vo-preview-rgb {
  font-size: 11px;
  color: var(--text-secondary);
}

.vo-popover-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  margin: 8px 0 4px;
  letter-spacing: 0.5px;
}

.vo-hue-container {
  margin-bottom: 10px;
}

.vo-hue-slider {
  width: 100%;
  height: 12px;
  border-radius: 6px;
  appearance: none;
  -webkit-appearance: none;
  outline: none;
  background: var(--hue-gradient);
  cursor: pointer;
}

.vo-hue-slider::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-white);
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
  cursor: pointer;
}

.vo-hue-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-white);
  border: 2px solid var(--border);
  box-shadow: var(--shadow);
  cursor: pointer;
}

.vo-palette-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 6px;
  margin-bottom: 12px;
}

.vo-palette-swatch {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease;
  padding: 0;
}

.vo-palette-swatch:hover {
  transform: scale(1.2);
  z-index: 5;
  border-color: var(--accent);
}

.vo-palette-swatch.active {
  transform: scale(1.2);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 2px var(--accent-transparent);
}

.vo-popover-input-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
  white-space: nowrap;
  gap: 8px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 6px 12px;
  border-radius: 10px;
}

.vo-popover-input-group .hash {
  font-family: monospace;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  flex-shrink: 0;
}

.vo-popover-hex-field {
  flex: 1;
  width: 0;
  min-width: 0;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  outline: none;
  text-transform: uppercase;
}

.vo-popover-action-btn {
  flex-shrink: 0;
  white-space: nowrap;
  background: var(--accent);
  border: none;
  color: var(--color-white);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
}

.vo-popover-action-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* Saved Themes Modal */
.vo-themes-modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  backdrop-filter: blur(8px);
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.vo-themes-modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.vo-themes-modal {
  width: 90%;
  max-width: 420px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-popover);
  padding: 24px;
  transform: scale(0.95);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.vo-themes-modal-overlay.open .vo-themes-modal {
  transform: scale(1);
}

/* ── 8. TOAST NOTIFICATIONS ───────────────────────────────── */
.vo-toast,
.ui-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 4000;
}

.vo-toast.show,
.ui-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── 9. ICONS & ANIMATION CARDS ───────────────────────────── */
.material-icons-round {
  vertical-align: middle;
}

.vo-anim-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.vo-anim-thumb {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 8px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.vo-anim-thumb:hover {
  background: var(--glass-bg-hover);
  border-color: var(--accent);
}

.vo-anim-thumb.active {
  background: var(--accent-transparent);
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.vo-anim-thumb .thumb-icon {
  font-size: 22px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.vo-anim-thumb.active .thumb-icon {
  color: var(--accent);
}

.vo-anim-thumb .thumb-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
}

/* ── Test Version Notice Footer ───────────────────────────── */
.test-notice-footer {
    text-align: center;
    padding: 14px 20px;
    margin-top: auto;
    font-size: 13px;
    color: var(--text-secondary, #94a3b8);
    border-top: 1px solid var(--border, rgba(255, 255, 255, 0.08));
    background: var(--surface, rgba(15, 23, 42, 0.4));
    backdrop-filter: blur(8px);
    z-index: 50;
    position: relative;
}

.test-notice-content {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.4;
}

.test-notice-icon {
    font-size: 18px;
    color: #f59e0b;
    flex-shrink: 0;
}