/* ==========================================================================
   Praktisyen.com ICD-10 Search & Recommendation System
   Modern Clinical Design System (Pure Vanilla CSS)
   ========================================================================== */

:root {
  /* Core Color Palette - Dark Mode (Default) */
  --bg-primary: #0a0f1d;
  --bg-secondary: #11192e;
  --bg-card: rgba(18, 26, 47, 0.75);
  --bg-card-hover: rgba(26, 38, 68, 0.9);
  --bg-input: rgba(15, 23, 42, 0.85);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: #0ea5e9;
  --border-card: rgba(148, 163, 184, 0.12);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Accent & Category Colors */
  --primary: #0ea5e9;
  --primary-hover: #38bdf8;
  --primary-glow: rgba(14, 165, 233, 0.25);
  
  --emerald: #10b981;
  --emerald-bg: rgba(16, 185, 129, 0.12);
  --emerald-border: rgba(16, 185, 129, 0.3);

  --purple: #a855f7;
  --purple-bg: rgba(168, 85, 247, 0.12);
  --purple-border: rgba(168, 85, 247, 0.3);

  --amber: #f59e0b;
  --amber-bg: rgba(245, 158, 11, 0.12);
  --amber-border: rgba(245, 158, 11, 0.3);

  --rose: #f43f5e;
  --rose-bg: rgba(244, 63, 94, 0.15);
  --rose-border: rgba(244, 63, 94, 0.35);

  --code-color: #38bdf8;
  --code-bg: rgba(14, 165, 233, 0.1);

  /* Shadows & Glass */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
  --glass-blur: blur(14px);

  /* Font Families */
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Mode Overrides */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.95);
  --bg-card-hover: #ffffff;
  --bg-input: #ffffff;

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-focus: #0284c7;
  --border-card: rgba(203, 213, 225, 0.8);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-glow: rgba(2, 132, 199, 0.15);

  --emerald: #059669;
  --emerald-bg: rgba(5, 150, 105, 0.08);
  --emerald-border: rgba(5, 150, 105, 0.25);

  --purple: #7c3aed;
  --purple-bg: rgba(124, 58, 237, 0.08);
  --purple-border: rgba(124, 58, 237, 0.25);

  --code-color: #0369a1;
  --code-bg: rgba(2, 132, 199, 0.08);

  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.12);
}

/* Base Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(circle at 15% 10%, rgba(14, 165, 233, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 20%, rgba(168, 85, 247, 0.06) 0%, transparent 45%);
  background-attachment: fixed;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   Header Styles
   ========================================================================== */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: var(--glass-blur);
  background: rgba(10, 15, 29, 0.8);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal);
}

[data-theme="light"] .app-header {
  background: rgba(255, 255, 255, 0.88);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-logo {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0284c7, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 14px var(--primary-glow);
  flex-shrink: 0;
}

.pulse-icon {
  width: 26px;
  height: 26px;
  animation: heartbeat 2.5s infinite ease-in-out;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  10%, 25% { transform: scale(1.08); }
  15% { transform: scale(0.96); }
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-tld {
  color: var(--primary);
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--primary-glow);
  color: var(--primary);
  border: 1px solid var(--border-focus);
}

.brand-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.dataset-pill {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.dot-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--emerald);
  box-shadow: 0 0 8px var(--emerald);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.btn-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
}

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

.btn-outline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-outline:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary);
  transform: translateY(-1px);
}

.btn-outline svg {
  width: 18px;
  height: 18px;
  color: var(--amber);
}

.counter-badge {
  background: var(--primary);
  color: #ffffff;
  font-size: 0.7rem;
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-full);
  font-weight: 700;
}

/* ==========================================================================
   Search Hero Section
   ========================================================================== */
.main-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  width: 100%;
  flex: 1;
}

.search-hero {
  margin-bottom: 2rem;
}

.search-box-wrapper {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-normal);
}

.search-box-wrapper:focus-within {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md), 0 0 0 3px var(--primary-glow);
}

/* Mode Tabs */
.mode-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.mode-tab {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.mode-tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.mode-tab.active {
  background: var(--primary-glow);
  color: var(--primary);
  border-color: var(--border-focus);
}

.tab-icon {
  font-size: 1.05rem;
}

/* Search Input Box */
.search-input-container {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 1.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.4rem 0.85rem;
  transition: all var(--transition-fast);
}

.search-input-container:focus-within {
  border-color: var(--border-focus);
}

.search-icon-left {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  margin-right: 0.75rem;
  flex-shrink: 0;
}

.search-icon-left svg {
  width: 24px;
  height: 24px;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-primary);
  padding: 0.6rem 0;
}

.search-input::placeholder {
  color: var(--text-muted);
  font-size: 1.02rem;
  font-weight: 400;
}

.clear-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.clear-btn.visible {
  opacity: 1;
  visibility: visible;
}

.clear-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.clear-btn svg {
  width: 18px;
  height: 18px;
}

.kbd-shortcut {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  margin-left: 0.5rem;
  user-select: none;
}

/* Filter Row & Presets */
.filter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.presets-container {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.presets-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.preset-chips-scroll {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  scrollbar-width: thin;
}

.chip-btn {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.chip-btn:hover {
  background: var(--bg-card-hover);
  color: var(--primary);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.chapter-filter-wrapper {
  flex-shrink: 0;
}

.chapter-select {
  appearance: none;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.45rem 2rem 0.45rem 0.85rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  outline: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  background-size: 14px;
}

.chapter-select:focus {
  border-color: var(--border-focus);
}

/* ==========================================================================
   Red Flag Alert Banner
   ========================================================================== */
.red-flag-alert {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--rose-bg);
  border: 1px solid var(--rose-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 16px rgba(244, 63, 94, 0.15);
  animation: alertPulse 3s infinite ease-in-out;
}

@keyframes alertPulse {
  0%, 100% { border-color: var(--rose-border); }
  50% { border-color: rgba(244, 63, 94, 0.7); }
}

.red-flag-alert.hidden {
  display: none;
}

.alert-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.alert-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--rose);
  margin-bottom: 0.2rem;
}

.alert-desc {
  font-size: 0.88rem;
  color: var(--text-primary);
  line-height: 1.45;
}

/* ==========================================================================
   Results Meta & Legend
   ========================================================================== */
.results-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.2rem;
  padding: 0 0.25rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.results-count {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.count-number {
  color: var(--primary);
  font-weight: 700;
}

.results-legend {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.badge-emerald { background-color: var(--emerald); }
.badge-purple { background-color: var(--purple); }
.badge-primary { background-color: var(--primary); }

/* ==========================================================================
   Results Grid & Cards
   ========================================================================== */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.25rem;
}

.result-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.result-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
  background: var(--bg-card-hover);
}

.result-card.is-red-flag {
  border-color: var(--rose-border);
  background: linear-gradient(180deg, var(--rose-bg) 0%, var(--bg-card) 60%);
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.card-code-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.code-badge-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.icd-code {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--code-color);
  background: var(--code-bg);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-focus);
}

.match-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
}

.badge-emerald-solid {
  background: var(--emerald-bg);
  color: var(--emerald);
  border: 1px solid var(--emerald-border);
}

.badge-purple-solid {
  background: var(--purple-bg);
  color: var(--purple);
  border: 1px solid var(--purple-border);
}

.badge-primary-solid {
  background: var(--primary-glow);
  color: var(--primary);
  border: 1px solid var(--border-focus);
}

.badge-danger-solid {
  background: var(--rose-bg);
  color: var(--rose);
  border: 1px solid var(--rose-border);
  font-weight: 700;
}

.badge-neutral-solid {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-star {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.35rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-star:hover {
  color: var(--amber);
  transform: scale(1.15);
}

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

.btn-copy {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--primary-glow);
  border: 1px solid var(--border-focus);
  color: var(--primary);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-copy:hover {
  background: var(--primary);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-copy.copied {
  background: var(--emerald);
  border-color: var(--emerald);
  color: #ffffff;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

/* Chapter Pill */
.chapter-pill {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
}

/* Rationale Box */
.rationale-box {
  background: rgba(15, 23, 42, 0.6);
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 0.65rem 0.85rem;
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 0.75rem;
}

[data-theme="light"] .rationale-box {
  background: rgba(241, 245, 249, 0.8);
}

.rationale-box strong {
  color: var(--text-primary);
}

/* Clinical / Prescription Hints */
.card-details-box {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
}

.detail-row {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.detail-label {
  font-weight: 600;
  color: var(--text-muted);
  flex-shrink: 0;
}

.detail-value {
  color: var(--text-secondary);
}

/* Loading & Empty States */
.loading-state, .empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-lg);
}

.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(14, 165, 233, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 1.25rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.empty-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.empty-desc {
  max-width: 480px;
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ==========================================================================
   Slide-out Drawer (Favorites & History)
   ========================================================================== */
.drawer {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  justify-content: flex-end;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.drawer.open {
  opacity: 1;
  visibility: visible;
}

.drawer-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.drawer-panel {
  position: relative;
  width: 100%;
  max-width: 440px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-lg);
}

.drawer.open .drawer-panel {
  transform: translateX(0);
}

.drawer-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-title-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.drawer-title-group svg {
  width: 20px;
  height: 20px;
  color: var(--amber);
}

.drawer-title-group h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
}

.btn-close {
  background: transparent;
  border: none;
  font-size: 1.2rem;
  color: var(--text-muted);
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.drawer-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(0, 0, 0, 0.15);
}

.drawer-tab {
  flex: 1;
  padding: 0.85rem;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.drawer-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: var(--primary-glow);
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
}

.drawer-pane {
  display: none;
}

.drawer-pane.active {
  display: block;
}

.drawer-items-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.drawer-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  transition: all var(--transition-fast);
}

.drawer-item:hover {
  border-color: var(--border-focus);
  transform: translateX(-2px);
}

.drawer-item-info {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}

.drawer-item-code {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--code-color);
}

.drawer-item-title {
  font-size: 0.82rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.drawer-item-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.empty-text {
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
  padding: 2rem 1rem;
  line-height: 1.5;
}

.drawer-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
}

.btn-text-danger {
  background: transparent;
  border: none;
  color: var(--rose);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.btn-text-danger:hover {
  background: var(--rose-bg);
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 300;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: #0f172a;
  color: #ffffff;
  border: 1px solid var(--emerald);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  transform: translateY(0);
  opacity: 1;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] .toast {
  background: #ffffff;
  color: #0f172a;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.toast.hidden {
  transform: translateY(20px);
  opacity: 0;
  pointer-events: none;
}

.toast-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--emerald);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.toast-message {
  font-size: 0.9rem;
  font-weight: 600;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.app-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  padding: 1.5rem 0;
  margin-top: auto;
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-left p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-sub {
  font-size: 0.75rem !important;
  color: var(--text-muted) !important;
  margin-top: 0.2rem;
}

.footer-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.7rem;
  border-radius: var(--radius-full);
  background: var(--primary-glow);
  color: var(--primary);
  border: 1px solid var(--border-focus);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 768px) {
  .header-container {
    padding: 0.75rem 1rem;
  }

  .brand-subtitle {
    display: none;
  }

  .dataset-pill {
    display: none;
  }

  .main-container {
    padding: 1.25rem 1rem 3rem;
  }

  .search-box-wrapper {
    padding: 1rem;
  }

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

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

  .chapter-select {
    width: 100%;
  }

  .toast {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    justify-content: center;
  }
}