/* ==========================================================================
   Fireground Hydraulics - Professional Styling
   Theme: Tactical Fireground Dark / High-Vis Daylight
   ========================================================================== */

:root {
  /* Tactical Dark Palette (Default) */
  --bg-primary: #0b1120;
  --bg-secondary: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #24344d;
  --bg-input: #0f172a;
  
  --border-color: #334155;
  --border-focus: #38bdf8;

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

  --accent-red: #ef4444;
  --accent-red-hover: #dc2626;
  --accent-amber: #f59e0b;
  --accent-gold: #fbbf24;
  --accent-blue: #38bdf8;
  --accent-green: #10b981;
  --accent-purple: #8b5cf6;

  --gauge-track: #1e293b;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;

  --sidebar-width: 280px;
  --header-height: 64px;
  --mobile-bar-height: 64px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

[data-theme="high-vis"] {
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #f8fafc;
  
  --border-color: #cbd5e1;
  --border-focus: #0284c7;

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

  --accent-red: #b91c1c;
  --accent-red-hover: #991b1b;
  --accent-amber: #d97706;
  --accent-gold: #b45309;
  --accent-blue: #0284c7;
  --accent-green: #059669;

  --gauge-track: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* ==========================================================================
   Reset & Base Elements
   ========================================================================== */

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

/* App Container */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ==========================================================================
   Header Bar
   ========================================================================== */

.app-header {
  height: var(--header-height);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

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

.mobile-nav-toggle {
  display: none;
}

.app-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.4));
  transition: transform 0.2s ease;
}

.app-brand:hover .brand-logo-img {
  transform: scale(1.08);
}

.brand-title {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.1;
}

.brand-sub {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-gold);
  display: block;
}

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

.dept-badge-pill {
  background-color: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--accent-blue);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.dept-badge-pill:hover {
  background-color: rgba(56, 189, 248, 0.2);
  border-color: var(--accent-blue);
}

/* Buttons */
.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 1rem;
}

.btn-icon:hover {
  color: var(--text-primary);
  border-color: var(--accent-blue);
  background-color: var(--bg-card);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.btn-block {
  width: 100%;
}

.btn:disabled,
button:disabled {
  opacity: 0.25;
  cursor: not-allowed !important;
  pointer-events: none;
  filter: grayscale(0.25);
  box-shadow: none !important;
}

.btn-disabled-wrap {
  display: inline-flex;
  cursor: not-allowed;
  position: relative;
}

.btn-disabled-wrap .btn:disabled {
  pointer-events: none;
}

.btn-lg {
  padding: 0.85rem 1.4rem;
  font-size: 1rem;
}

.btn-sm {
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
}

.btn-primary {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: #fff;
  box-shadow: 0 2px 6px rgba(239, 68, 68, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  box-shadow: 0 4px 10px rgba(239, 68, 68, 0.45);
}

.btn-secondary {
  background-color: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--text-muted);
}

.btn-outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-secondary);
}

.btn-outline:hover {
  border-color: var(--accent-blue);
  color: var(--text-primary);
  background-color: var(--bg-card);
}

.btn-success {
  background-color: var(--accent-green);
  color: #fff;
}

.btn-danger {
  background-color: #ef4444;
  color: #fff;
}

/* ==========================================================================
   App Body Layout (Sidebar + Main Content)
   ========================================================================== */

.app-body {
  display: flex;
  flex: 1;
}

/* Sidebar Navigation */
.sidebar-nav {
  width: var(--sidebar-width);
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.25rem 0.75rem;
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  z-index: 40;
}

.sidebar-header {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.5rem 1rem 0.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.sidebar-brand-card {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.sidebar-logo-img {
  width: 26px;
  height: 26px;
  object-fit: contain;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.35));
}

.sidebar-brand-text {
  display: flex;
  flex-direction: column;
}

.sidebar-brand-title {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.15;
}

.sidebar-brand-sub {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent-gold);
  letter-spacing: 0.06em;
}

.nav-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.75rem 1rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  width: 100%;
}

.nav-item i {
  font-size: 1.15rem;
  width: 24px;
  text-align: center;
  color: var(--text-muted);
  transition: color 0.2s;
}

.nav-item-text {
  display: flex;
  flex-direction: column;
}

.nav-label {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.nav-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.nav-item:hover {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

.nav-item:hover i {
  color: var(--accent-blue);
}

.nav-item.active {
  background-color: rgba(239, 68, 68, 0.12);
  border-color: rgba(239, 68, 68, 0.35);
}

.nav-item.active i {
  color: var(--accent-red);
}

.nav-item.active .nav-label {
  color: var(--accent-red);
}

.sidebar-footer {
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.standard-ref-pill {
  background-color: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--accent-gold);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.version-tag {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

/* Main Content Section */
.main-content {
  flex: 1;
  padding: 1.5rem 2rem;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.view-section {
  display: none;
  animation: fadeIn 0.25s ease-in-out;
}

.view-section.active {
  display: block;
}

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

.view-header {
  margin-bottom: 1.5rem;
}

.view-header-title {
  flex: 1;
}

.view-header h2 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.view-header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ==========================================================================
   Calculator View Styling
   ========================================================================== */

.calc-tabs-bar {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  -webkit-overflow-scrolling: touch;
}

.calc-tabs-bar::-webkit-scrollbar {
  height: 4px;
}

.calc-tabs-bar::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.calc-tab-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.55rem 0.95rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
  flex-shrink: 0;
}

.calc-tab-btn:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.calc-tab-btn.active {
  background-color: var(--accent-red);
  color: #fff;
  border-color: var(--accent-red);
  box-shadow: 0 2px 6px rgba(239, 68, 68, 0.35);
}

/* 2-Column Calculator Grid */
.calc-panel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  align-items: start;
}

.calc-input-panel {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.panel-heading {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.panel-subtext {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}

/* Form Controls */
.form-group {
  margin-bottom: 1.15rem;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  letter-spacing: 0.02em;
}

.form-row {
  display: flex;
  gap: 1rem;
}

.form-row .col-4 { flex: 4; }
.form-row .col-6 { flex: 6; }

.form-select, .form-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.92rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.form-select-sm, .form-input-sm {
  padding: 0.4rem 0.65rem;
  font-size: 0.82rem;
}

.form-select:focus, .form-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.form-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  display: block;
}

/* Toggle Pill Group */
.toggle-pill-group {
  display: flex;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 3px;
}

.pill-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.pill-btn.active {
  background-color: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

/* Sub Section Card */
.sub-section-card {
  background-color: rgba(15, 23, 42, 0.4);
  border: 1px solid rgba(51, 65, 85, 0.6);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1rem;
}

.sub-section-card h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ==========================================================================
   Result Dashboard Card & Gauge
   ========================================================================== */

.calc-output-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.result-dashboard-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.result-dashboard-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.result-dashboard-card.gauge-safe::before { background: var(--accent-green); }
.result-dashboard-card.gauge-warning::before { background: var(--accent-amber); }
.result-dashboard-card.gauge-danger::before { background: var(--accent-red); }

.gauge-container {
  width: 170px;
  height: 170px;
  flex-shrink: 0;
}

.pressure-gauge-svg {
  width: 100%;
  height: 100%;
}

.gauge-value-arc {
  transition: stroke-dashoffset 0.6s ease;
}

.result-dashboard-card.gauge-safe .gauge-value-arc { color: var(--accent-green); }
.result-dashboard-card.gauge-warning .gauge-value-arc { color: var(--accent-amber); }
.result-dashboard-card.gauge-danger .gauge-value-arc { color: var(--accent-red); }

.gauge-num {
  font-size: 2.2rem;
  font-weight: 900;
  fill: var(--text-primary);
  font-family: var(--font-mono);
}

.gauge-unit {
  font-size: 0.8rem;
  font-weight: 700;
  fill: var(--text-muted);
}

.gauge-sub {
  font-size: 0.58rem;
  font-weight: 700;
  fill: var(--text-secondary);
  letter-spacing: 0.05em;
}

.result-details-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.result-highlight-badge {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.95rem;
  display: flex;
  flex-direction: column;
}

.badge-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.badge-value {
  font-size: 1.6rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-blue);
  line-height: 1.1;
}

.secondary-badge .badge-value {
  color: var(--accent-amber);
}

.result-mini-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  padding: 0.3rem 0;
  border-bottom: 1px dashed rgba(51, 65, 85, 0.5);
}

.stat-label {
  color: var(--text-secondary);
}

.stat-val {
  font-weight: 700;
  color: var(--text-primary);
}

/* Relay Big Number Card */
.relay-stat-box {
  width: 150px;
  text-align: center;
  padding: 1rem;
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.relay-stat-num {
  font-size: 3rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--accent-red);
  line-height: 1;
}

.relay-stat-label {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* ==========================================================================
   Scratchpad Card
   ========================================================================== */

.scratchpad-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.scratchpad-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--accent-gold);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.65rem;
}

.scratchpad-header h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.scratchpad-steps {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.scratchpad-step-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.5rem 0.65rem;
  background-color: rgba(15, 23, 42, 0.4);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-blue);
}

.step-num-badge {
  background-color: var(--accent-blue);
  color: #0f172a;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.2rem 0.45rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.step-content {
  flex: 1;
}

.step-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.step-detail {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  line-height: 1.4;
}

/* Info Alert Box */
.info-alert-box {
  background-color: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-top: 1rem;
}

.info-alert-box i {
  color: var(--accent-blue);
  font-size: 1.1rem;
  margin-top: 0.15rem;
}

/* ==========================================================================
   Tools Grid Layout
   ========================================================================== */

.tools-grid-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 1.5rem;
}

.tool-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
}

.tool-card-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--accent-blue);
  margin-bottom: 1rem;
}

.tool-card-header h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tool-output-box {
  margin-top: 1rem;
  background-color: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
}

.output-highlight {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.output-rule {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  margin-bottom: 0.35rem;
}

.output-total {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.tool-alert {
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.15);
  border: 1px solid var(--accent-red);
  color: #fca5a5;
}

/* ==========================================================================
   Exam & Practice Tests View
   ========================================================================== */

.exam-hero-banner {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.15) 0%, rgba(15, 23, 42, 0.8) 100%);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.banner-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background-color: var(--accent-red);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  flex-shrink: 0;
}

.banner-logo-wrap {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2px;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.banner-hero-logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.35));
}

.banner-text h2 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
}

.banner-text p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.exam-track-selection-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
}

.track-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.track-badge {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.55rem;
  border-radius: 9999px;
  background-color: rgba(56, 189, 248, 0.15);
  color: var(--accent-blue);
  display: inline-block;
  margin-bottom: 0.75rem;
}

.badge-official {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--accent-gold);
}

.track-header h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.track-header p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 1.5rem;
}

.manual-features-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.feature-item {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feature-item i {
  color: var(--accent-green);
}

/* Exam Session Layout */
.exam-session-layout {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.exam-session-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1.25rem;
}

.toolbar-left, .toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.exam-title-badge {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-blue);
}

.question-tracker-pill {
  font-size: 0.88rem;
  font-weight: 700;
  background-color: var(--bg-primary);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
}

.timer-display-pill {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  color: var(--accent-gold);
}

.timer-display-pill.timer-urgent {
  color: #ef4444;
  border-color: #ef4444;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.btn-icon.bookmarked {
  color: var(--accent-gold);
  border-color: var(--accent-gold);
}

/* Exam Question Card */
.exam-question-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.question-meta-row {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.meta-cat-badge, .meta-ref-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.exam-question-title {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 1.75rem;
  color: var(--text-primary);
}

.exam-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.option-btn {
  background-color: var(--bg-input);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.option-indicator {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--text-muted);
  flex-shrink: 0;
  transition: all 0.2s;
}

.option-text {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.option-btn:hover:not(:disabled) {
  border-color: var(--accent-blue);
  background-color: var(--bg-card-hover);
}

.option-btn.selected {
  border-color: var(--accent-blue);
  background-color: rgba(56, 189, 248, 0.12);
}

.option-btn.selected .option-indicator {
  background-color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.option-btn.correct-opt {
  border-color: var(--accent-green) !important;
  background-color: rgba(16, 185, 129, 0.15) !important;
}

.option-btn.wrong-opt {
  border-color: var(--accent-red) !important;
  background-color: rgba(239, 68, 68, 0.15) !important;
}

/* Instant Feedback Box */
.instant-feedback-card {
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1rem;
}

.feedback-correct {
  background-color: rgba(16, 185, 129, 0.12);
  border: 1px solid var(--accent-green);
}

.feedback-wrong {
  background-color: rgba(239, 68, 68, 0.12);
  border: 1px solid var(--accent-red);
}

.feedback-title {
  font-size: 1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.feedback-correct .feedback-title { color: var(--accent-green); }
.feedback-wrong .feedback-title { color: var(--accent-red); }

.explanation-pre {
  white-space: pre-wrap;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 0.5rem;
}

/* Exam Session Footer */
.exam-session-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-nav-buttons {
  display: flex;
  gap: 0.75rem;
}

/* Question Palette Drawer */
.question-palette-drawer {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.palette-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.palette-bubbles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.palette-bubble {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.palette-bubble.answered {
  background-color: rgba(56, 189, 248, 0.2);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.palette-bubble.current {
  border-color: var(--accent-red);
  background-color: var(--accent-red);
  color: #fff;
}

.palette-bubble.marked {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

/* Results Screen */
.exam-results-screen {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.results-score-card {
  text-align: center;
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
}

.results-score-card.score-passed {
  border-color: rgba(16, 185, 129, 0.4);
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.1) 0%, var(--bg-card) 100%);
}

.results-score-card.score-failed {
  border-color: rgba(239, 68, 68, 0.4);
  background: linear-gradient(180deg, rgba(239, 68, 68, 0.1) 0%, var(--bg-card) 100%);
}

.score-logo-wrap {
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: center;
}

.score-truck-logo {
  width: 44px;
  height: 44px;
  object-fit: contain;
  filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.3));
}

.score-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.score-passed .score-icon { color: var(--accent-green); }
.score-failed .score-icon { color: var(--accent-red); }

.score-big-number {
  font-size: 4.5rem;
  font-weight: 900;
  font-family: var(--font-mono);
  line-height: 1;
  margin: 0.75rem 0;
}

.score-passed .score-big-number { color: var(--accent-green); }
.score-failed .score-big-number { color: var(--accent-red); }

.score-summary-text {
  max-width: 600px;
  margin: 0 auto 1.5rem auto;
  color: var(--text-secondary);
}

.score-action-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.review-questions-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.review-question-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.review-question-card.rev-correct { border-left: 4px solid var(--accent-green); }
.review-question-card.rev-wrong { border-left: 4px solid var(--accent-red); }

.rev-card-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.rev-num {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
}

.status-correct { color: var(--accent-green); font-size: 0.8rem; font-weight: 700; }
.status-wrong { color: var(--accent-red); font-size: 0.8rem; font-weight: 700; }

.rev-question-text {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.rev-answer-comparison {
  display: flex;
  gap: 2rem;
  margin-bottom: 1rem;
  background-color: rgba(15, 23, 42, 0.4);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
}

.rev-col {
  display: flex;
  flex-direction: column;
}

.rev-label {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.rev-val {
  font-size: 1.1rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.text-success { color: var(--accent-green); }
.text-danger { color: var(--accent-red); }

/* ==========================================================================
   Study View & Flashcards
   ========================================================================== */

.study-hero-banner {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.12) 0%, rgba(15, 23, 42, 0.8) 100%);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.study-sub-nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.sub-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s;
  white-space: nowrap;
}

.sub-tab-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-card);
}

.sub-tab-btn.active {
  background-color: var(--bg-card);
  color: var(--accent-blue);
  box-shadow: var(--shadow-sm);
}

/* Flashcards Scene */
.flashcards-wrapper {
  max-width: 680px;
  margin: 0 auto;
}

.flashcard-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

.flashcard-progress {
  font-size: 0.8rem;
  color: var(--text-secondary);
  flex: 1;
}

.progress-bar-track {
  height: 6px;
  background-color: var(--bg-card);
  border-radius: 9999px;
  overflow: hidden;
  margin-top: 0.35rem;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--accent-green);
  transition: width 0.3s;
}

.flashcard-scene {
  perspective: 1000px;
  height: 340px;
  cursor: pointer;
}

.flashcard-card {
  width: 100%;
  height: 100%;
  position: relative;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

.flashcard-card.is-flipped {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-lg);
}

.flashcard-front {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(15, 23, 42, 0.95) 100%);
}

.flashcard-back {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  transform: rotateY(180deg);
  border-color: var(--accent-blue);
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-category-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-gold);
  background-color: rgba(245, 158, 11, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.card-count {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.card-status-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-input);
  color: var(--text-secondary);
}

.badge-mastered {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--accent-green);
}

.card-prompt-text {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.4;
  text-align: center;
  color: var(--text-primary);
}

.card-answer-text {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  color: var(--accent-blue);
  white-space: pre-wrap;
}

.card-tap-hint {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.flashcard-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.btn-icon-round {
  width: 48px;
  height: 48px;
  border-radius: 50%;
}

/* Cheat Sheet Cards */
.cheat-sheet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.cheat-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.cheat-card-header {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.cheat-formula {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-gold);
  margin-bottom: 0.75rem;
}

.cheat-notes {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.cheat-table {
  width: 100%;
  font-size: 0.82rem;
  border-collapse: collapse;
}

.cheat-table td {
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(51, 65, 85, 0.4);
}

.cheat-table td:last-child {
  text-align: right;
  color: var(--accent-gold);
}

.cheat-subnote {
  font-size: 0.7rem;
  color: var(--text-muted);
  display: block;
  margin-top: 0.5rem;
}

/* Tables View */
.table-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.table-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.table-card-header h4 {
  font-size: 1rem;
  font-weight: 700;
}

.table-responsive {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.data-table th, .data-table td {
  padding: 0.6rem 0.85rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background-color: rgba(15, 23, 42, 0.5);
  font-weight: 700;
  color: var(--text-muted);
}

.flr-cell {
  font-weight: 800;
  color: var(--accent-red);
  font-family: var(--font-mono);
}

.table-grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

/* Annual Service Test Timeline */
.guide-header-banner {
  background-color: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.guide-header-banner h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--accent-blue);
  margin-bottom: 0.25rem;
}

.guide-header-banner p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.prep-checklist-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

.prep-checklist-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--accent-amber);
}

.prep-checklist-card ul {
  padding-left: 1.25rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.prep-checklist-card li {
  margin-bottom: 0.35rem;
}

.test-steps-timeline {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.test-step-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.step-badge {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--accent-red);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  flex-shrink: 0;
}

.step-name {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.step-proc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.step-criteria {
  font-size: 0.82rem;
  color: var(--accent-green);
  background-color: rgba(16, 185, 129, 0.1);
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  display: inline-block;
}

/* Glossary */
.glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.glossary-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.glossary-abbr {
  font-size: 1.15rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-blue);
}

.glossary-term {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.glossary-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Department Management View
   ========================================================================== */

.dept-banner {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(15, 23, 42, 0.8) 100%);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.dept-selection-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.dept-btn-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.dept-permissions-notice {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  color: var(--accent-gold);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  line-height: 1.4;
  margin-bottom: 1.5rem;
}

.dept-permissions-notice i {
  font-size: 1.1rem;
  color: var(--accent-gold);
  flex-shrink: 0;
}

.dept-specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.dept-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.dept-card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-blue);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.specs-table {
  width: 100%;
  font-size: 0.85rem;
}

.specs-table td {
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(51, 65, 85, 0.4);
}

.specs-table td:last-child {
  text-align: right;
  color: var(--accent-gold);
}

.dept-custom-footer {
  margin-top: 1.5rem;
  text-align: right;
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
  padding: 1rem;
}

.modal-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 580px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  max-height: 90vh;
  overflow-y: auto;
}

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

.modal-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* ==========================================================================
   Mobile Bottom Navigation Bar
   ========================================================================== */

.mobile-bottom-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--mobile-bar-height);
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  z-index: 45;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.3);
  padding-bottom: env(safe-area-inset-bottom);
}

.mobile-bar-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.mobile-bar-btn i {
  font-size: 1.2rem;
}

.mobile-bar-btn.active {
  color: var(--accent-red);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 1024px) {
  .calc-panel-grid {
    grid-template-columns: 1fr;
  }
  
  .exam-track-selection-grid {
    grid-template-columns: 1fr;
  }

  .table-grid-2col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }

  .sidebar-nav {
    position: fixed;
    left: -280px;
    top: 0;
    bottom: 0;
    width: 280px;
    height: 100vh;
    transition: left 0.3s ease;
    box-shadow: var(--shadow-lg);
  }

  .sidebar-nav.open {
    left: 0;
  }

  .sidebar-header {
    display: flex;
  }

  .mobile-nav-toggle {
    display: inline-flex;
  }

  .mobile-bottom-bar {
    display: flex;
  }

  .main-content {
    padding: 1rem;
    padding-bottom: calc(var(--mobile-bar-height) + 1.5rem);
  }

  .app-header {
    padding: 0 1rem;
  }

  .brand-sub {
    display: none;
  }

  .result-dashboard-card {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  .gauge-container {
    margin: 0 auto;
  }

  .exam-options-grid {
    grid-template-columns: 1fr;
  }

  .exam-question-card {
    padding: 1.25rem;
  }

  .exam-session-toolbar {
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-start;
  }

  .toolbar-center {
    width: 100%;
  }

  .question-tracker-pill {
    display: block;
    text-align: center;
    width: 100%;
  }

  .flashcard-scene {
    height: 380px;
  }

  .flashcard-face {
    padding: 1.25rem;
  }

  .card-prompt-text {
    font-size: 1.15rem;
  }

  .card-answer-text {
    font-size: 1.05rem;
  }

  .form-row {
    flex-direction: column;
    gap: 0;
  }

  .form-row .col-4, .form-row .col-6 {
    flex: auto;
  }
}

@media (max-width: 480px) {
  .brand-title {
    font-size: 1.02rem;
  }

  .brand-logo {
    width: 26px;
    height: 26px;
  }

  .brand-logo-img {
    width: 26px;
    height: 26px;
  }

  .banner-logo-wrap {
    width: 32px;
    height: 32px;
  }

  .dept-badge-pill {
    padding: 0.25rem 0.55rem;
    font-size: 0.72rem;
  }
}

/* ==========================================================================
   Print Stylesheet
   ========================================================================== */

@media print {
  body {
    background-color: #fff;
    color: #000;
  }

  .app-header, .sidebar-nav, .mobile-bottom-bar, .score-action-buttons, .footer-nav-buttons {
    display: none !important;
  }

  .main-content {
    max-width: 100%;
    padding: 0;
  }

  .review-question-card {
    page-break-inside: avoid;
    border: 1px solid #ccc;
    margin-bottom: 1rem;
  }
}