/*
 * =========================================================================================
 * Style Sheet : EnvAir Pro Mission Control Telemetry Deck
 * Design System: Linear/Apple Double-Bezel (Doppelrand) Architecture
 * Color Grading: Dual-Theme Architecture (Deep Obsidian Dark + Ceramic Chalk Light)
 * Anti-Slop Rule: Strictly ZERO AI purple gradient soup; High-contrast, crisp typography
 * =========================================================================================
 */

:root {
  /* ========================================================================
     Dark Mode Palette (Default - Obsidian & Machined Titanium)
     ======================================================================== */
  --bg-canvas: #07080a;
  --bg-surface: #0c0e12;
  --bg-surface-elevated: #11141c;
  --bg-surface-core: #151922;
  --bg-surface-hover: #1b202c;
  --bg-tile: rgba(0, 0, 0, 0.32);

  /* Hairlines & Borders */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-medium: rgba(255, 255, 255, 0.11);
  --border-active: rgba(255, 255, 255, 0.20);
  --border-master: rgba(6, 182, 212, 0.45);

  /* Typography */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-dim: #475569;

  /* Calibrated Atmospheric Signal Tokens */
  --c-good: #10b981;        /* Crisp Emerald */
  --c-satisfactory: #34d399;  /* Mint Green */
  --c-moderate: #f59e0b;    /* Warm Amber */
  --c-poor: #f97316;        /* Deep Ochre */
  --c-very-poor: #ef4444;   /* Coral Crimson */
  --c-severe: #b91c1c;      /* Deep Maroon */

  /* System Accents */
  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-purple: #a855f7;

  /* Doppelrand Geometry */
  --radius-outer: 22px;
  --radius-inner: 16px;
  --shell-padding: 6px;

  /* Motion Curves */
  --ease-spring: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Light Mode Override (Architectural Ceramic & Slate)
   ========================================================================== */
[data-theme="light"] {
  --bg-canvas: #f6f8fa;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-surface-core: #ffffff;
  --bg-surface-hover: #e2e8f0;
  --bg-tile: #f8fafc;

  --border-subtle: rgba(0, 0, 0, 0.06);
  --border-medium: rgba(0, 0, 0, 0.10);
  --border-active: rgba(0, 0, 0, 0.20);
  --border-master: rgba(6, 182, 212, 0.65);

  --text-primary: #090d16;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
}

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

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.font-mono {
  font-family: 'JetBrains Mono', monospace;
  font-feature-settings: 'tnum' 1;
}

/* Subtle Film Grain */
.film-grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 99;
  opacity: 0.02;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* ==========================================================================
   Navigation Masthead (Detached Floating Glass Pill)
   ========================================================================== */
.masthead-nav {
  position: sticky;
  top: 14px;
  z-index: 50;
  max-width: 1260px;
  margin: 0 auto;
  padding: 0 16px;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: var(--bg-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-medium);
  border-radius: 9999px;
  box-shadow: 0 12px 30px -4px rgba(0, 0, 0, 0.35);
  transition: all 0.3s ease;
}

[data-theme="light"] .nav-inner {
  box-shadow: 0 8px 24px -2px rgba(0, 0, 0, 0.08);
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.brand-meta {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-primary);
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 800;
  background: var(--accent-cyan);
  color: #07080a;
  padding: 1px 6px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.station-id {
  font-size: 0.68rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
}

.connectivity-strip {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-surface-elevated);
  padding: 4px 14px;
  border-radius: 9999px;
  border: 1px solid var(--border-subtle);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 7px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--c-good);
  box-shadow: 0 0 8px var(--c-good);
}

.live-pulse .status-dot {
  animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.25); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.status-text {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.metric-divider {
  width: 1px;
  height: 12px;
  background: var(--border-subtle);
}

.connection-meta {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
}

.meta-label { color: var(--text-muted); }
.meta-val { color: var(--text-secondary); font-weight: 600; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Button-in-Button Island CTAs */
.pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 6px 5px 14px;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s var(--ease-spring);
  border: 1px solid transparent;
  outline: none;
}

.theme-toggle-pill {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-medium);
  padding: 5px 12px;
}

.theme-toggle-pill:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-active);
  transform: translateY(-1px);
}

.theme-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.primary-pill {
  background: var(--text-primary);
  color: var(--bg-canvas);
  border-color: rgba(255, 255, 255, 0.4);
}

.primary-pill:hover {
  transform: translateY(-1px);
}

.primary-pill:active { transform: scale(0.98); }

.primary-pill .btn-icon-bubble {
  background: var(--bg-canvas);
  color: var(--text-primary);
}

.btn-icon-bubble {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s var(--ease-spring);
}

.pill-btn:hover .btn-icon-bubble {
  transform: translate(1px, -1px);
}

.time-readout {
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 0 4px;
}

/* ==========================================================================
   Page Layout & Hero Section
   ========================================================================== */
.page-container {
  max-width: 1260px;
  margin: 0 auto;
  padding: 36px 16px 80px 16px;
}

.hero-header {
  text-align: center;
  max-width: 880px;
  margin: 0 auto 36px auto;
}

.eyebrow-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px;
  border-radius: 9999px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
}

.hero-title {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  color: var(--text-primary);
  margin-bottom: 14px;
  text-wrap: balance;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.highlight-text {
  color: var(--text-primary);
  font-weight: 600;
}

/* ==========================================================================
   Alert Banner (Indoor Blind-Spot Override)
   ========================================================================== */
.alert-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.12), rgba(245, 158, 11, 0.08));
  border: 1px solid rgba(239, 68, 68, 0.4);
  border-radius: var(--radius-outer);
  margin-bottom: 36px;
  animation: banner-enter 0.4s var(--ease-spring);
}

.alert-banner.hidden { display: none; }

@keyframes banner-enter {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.alert-icon-ring {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 50%;
  background: rgba(239, 68, 68, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.45);
}

.alert-content { flex: 1; }

.alert-heading {
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: #f87171;
  margin-bottom: 3px;
}

.alert-body {
  font-size: 0.85rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.alert-badge {
  font-size: 0.68rem;
  font-weight: 800;
  padding: 5px 12px;
  border-radius: 6px;
  background: rgba(239, 68, 68, 0.25);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.4);
  white-space: nowrap;
}

/* ==========================================================================
   Section Blocks & Title Strips
   ========================================================================== */
.section-block {
  margin-bottom: 46px;
}

.section-title-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding: 0 4px;
}

.section-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.section-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.effective-formula-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.72rem;
}

.formula-icon {
  font-weight: 800;
  color: var(--accent-cyan);
}

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

.station-meta-strip {
  display: flex;
  gap: 8px;
}

.meta-chip {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

/* ==========================================================================
   The Doppelrand (Double-Bezel) Card Architecture
   ========================================================================== */
.doppel-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-outer);
  padding: var(--shell-padding);
  box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.25);
  transition: transform 0.25s var(--ease-spring), border-color 0.25s var(--ease-spring), box-shadow 0.25s var(--ease-spring);
  position: relative;
  will-change: transform, box-shadow, border-color;
}

.doppel-card:hover {
  transform: translateY(-3px);
  border-color: rgba(6, 182, 212, 0.45);
  box-shadow: 0 16px 36px -6px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(6, 182, 212, 0.35), inset 0 1.5px 0 rgba(255, 255, 255, 0.15);
}

[data-theme="light"] .doppel-card:hover {
  border-color: rgba(8, 145, 178, 0.45);
  box-shadow: 0 14px 30px -5px rgba(8, 145, 178, 0.18), 0 0 0 1px rgba(8, 145, 178, 0.35), inset 0 1.5px 0 #ffffff;
}

.card-inner {
  background: var(--bg-surface-core);
  border-radius: var(--radius-inner);
  border: 1px solid var(--border-subtle);
  padding: 22px;
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   1. QUAD-ENGINE AQI COMPARISON GRID
   ========================================================================== */
.quad-aqi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.engine-tag {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.engine-num {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.engine-type {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
}

.card-header { margin-bottom: 18px; }

.engine-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.method-sub {
  font-size: 0.74rem;
  color: var(--text-muted);
}

.dial-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--bg-tile);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  margin-bottom: 18px;
  gap: 10px;
}

.dial-metric {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.aqi-value {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--text-primary);
}

.aqi-unit {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  text-transform: uppercase;
  white-space: nowrap;
}

.aqi-badge-pill {
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-medium);
  white-space: nowrap;
}

/* Category Dynamic Tints */
.cat-good {
  background: rgba(16, 185, 129, 0.15);
  color: var(--c-good);
  border-color: rgba(16, 185, 129, 0.4);
}
.cat-satisfactory {
  background: rgba(52, 211, 153, 0.15);
  color: var(--c-satisfactory);
  border-color: rgba(52, 211, 153, 0.4);
}
.cat-moderate {
  background: rgba(245, 158, 11, 0.15);
  color: var(--c-moderate);
  border-color: rgba(245, 158, 11, 0.4);
}
.cat-poor {
  background: rgba(249, 115, 22, 0.15);
  color: var(--c-poor);
  border-color: rgba(249, 115, 22, 0.4);
}
.cat-very-poor {
  background: rgba(239, 68, 68, 0.18);
  color: var(--c-very-poor);
  border-color: rgba(239, 68, 68, 0.45);
}
.cat-severe {
  background: rgba(185, 28, 28, 0.25);
  color: #f87171;
  border-color: rgba(185, 28, 28, 0.5);
}

.engine-specs {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
}

.spec-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.74rem;
  gap: 6px;
}

.spec-label {
  color: var(--text-muted);
  white-space: nowrap;
}

.spec-val {
  color: var(--text-primary);
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
}

.text-red { color: #f87171 !important; font-weight: 600; }
.text-emerald { color: #34d399 !important; font-weight: 600; }
.text-accent { color: var(--accent-cyan) !important; font-weight: 600; }

/* Effective Master Card Showcase */
.effective-master-card {
  border-color: var(--border-master);
  position: relative;
}

.effective-master-card::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-outer);
  box-shadow: 0 0 25px -4px rgba(6, 182, 212, 0.22);
  pointer-events: none;
}

.highlight-master-tag .engine-type {
  background: rgba(6, 182, 212, 0.18);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.35);
}

.text-gradient-master {
  color: var(--accent-cyan);
}

/* ==========================================================================
   2. HARDWARE SENSOR MATRIX (4 BENTO DOMAINS)
   ========================================================================== */
.sensor-matrix-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.domain-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}

.domain-badge {
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 2px 7px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 4px;
}

.iaq-badge     { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.pm-badge      { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.climate-badge { background: rgba(6, 182, 212, 0.15);  color: #22d3ee; }
.gas-badge     { background: rgba(168, 85, 247, 0.15); color: #c084fc; }

.domain-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
}

.sensor-source {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.matrix-tiles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.matrix-tiles.three-cols { grid-template-columns: repeat(3, 1fr); }
.matrix-tiles.four-cols  { grid-template-columns: repeat(4, 1fr); }

.metric-tile {
  background: var(--bg-tile);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.22s var(--ease-spring);
  position: relative;
  will-change: transform, box-shadow, border-color;
}

.metric-tile:hover {
  transform: translateY(-2px);
  border-color: rgba(6, 182, 212, 0.45);
  box-shadow: 0 8px 18px -3px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(6, 182, 212, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

[data-theme="light"] .metric-tile:hover {
  border-color: rgba(8, 145, 178, 0.45);
  box-shadow: 0 6px 16px -3px rgba(8, 145, 178, 0.15), 0 0 0 1px rgba(8, 145, 178, 0.25), inset 0 1px 0 #ffffff;
}

.tile-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.tile-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

.delta-tag {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.tile-val-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 6px;
}

.tile-val {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1;
}

.tile-unit {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-weight: 600;
}

.tile-meter {
  width: 100%;
  height: 4px;
  background: var(--border-medium);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 6px;
}

.tile-meter-fill {
  height: 100%;
  background: var(--accent-cyan);
  border-radius: 2px;
  transition: width 0.4s var(--ease-spring);
}

.tile-status {
  font-size: 0.68rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   3. TIME HORIZONS & WAVEFORM VISUALIZER
   ========================================================================== */
.waveform-title-strip {
  align-items: center;
}

.chart-tab-strip {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.chart-tab {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  will-change: transform, box-shadow, border-color;
}

.chart-tab:hover {
  color: var(--text-primary);
  background: var(--bg-surface-hover);
  border-color: rgba(6, 182, 212, 0.45);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px -2px rgba(0, 0, 0, 0.35);
}

.chart-tab.active {
  background: var(--bg-surface-elevated);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  font-weight: 700;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px -4px rgba(6, 182, 212, 0.45), 0 0 0 1px var(--accent-cyan), inset 0 1.5px 0 0 rgba(255, 255, 255, 0.35);
}

[data-theme="light"] .chart-tab.active {
  background: #ffffff;
  color: #0891b2;
  border-color: #0891b2;
  box-shadow: 0 8px 20px -3px rgba(8, 145, 178, 0.32), 0 0 0 1.5px #0891b2, inset 0 1.5px 0 0 rgba(255, 255, 255, 0.9);
}

/* Time Horizon Filter Bar */
.time-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 12px;
  padding: 8px 14px;
  margin-bottom: 14px;
  flex-wrap: wrap;
  gap: 12px;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.filter-label {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-right: 4px;
}

.time-pill {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 5px 12px;
  border-radius: 7px;
  font-size: 0.74rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  will-change: transform, box-shadow, border-color;
}

.time-pill:hover {
  color: var(--text-primary);
  border-color: rgba(6, 182, 212, 0.45);
  transform: translateY(-1.5px);
  box-shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.3);
}

.time-pill.active {
  background: var(--accent-cyan);
  color: #07080a;
  border-color: var(--accent-cyan);
  font-weight: 700;
  transform: translateY(-2.5px);
  box-shadow: 0 8px 20px -2px rgba(6, 182, 212, 0.5), 0 0 0 1px var(--accent-cyan), inset 0 1.5px 0 0 rgba(255, 255, 255, 0.45);
}

[data-theme="light"] .time-pill.active {
  background: #0891b2;
  color: #ffffff;
  border-color: #0891b2;
  box-shadow: 0 8px 18px -2px rgba(8, 145, 178, 0.4), 0 0 0 1px #0891b2, inset 0 1.5px 0 0 rgba(255, 255, 255, 0.4);
}

.custom-range-inputs {
  display: flex;
  align-items: center;
  gap: 8px;
}

.custom-range-inputs.hidden { display: none; }

.date-input {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.72rem;
  font-family: 'JetBrains Mono', monospace;
  outline: none;
}

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

.small-btn {
  padding: 3px 10px;
  font-size: 0.72rem;
}

.cache-status-chip {
  font-size: 0.68rem;
  color: var(--text-muted);
}

/* DSP Filter Multi-Engine Toggle Button */
.dsp-filter-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  font-size: 0.74rem;
  font-weight: 700;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  will-change: transform, box-shadow, border-color;
}

.dsp-filter-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  transform: translateY(-1.5px);
  box-shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.3);
}

.dsp-filter-btn.active {
  background: rgba(6, 182, 212, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2.5px);
  box-shadow: 0 8px 22px -3px rgba(6, 182, 212, 0.45), 0 0 0 1px var(--accent-cyan), inset 0 1.5px 0 0 rgba(255, 255, 255, 0.3);
}

.dsp-pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background 0.3s ease;
}

.dsp-filter-btn.active .dsp-pulse-dot {
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: dspPulse 1.8s infinite;
}

@keyframes dspPulse {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 10px var(--accent-cyan); }
  100% { transform: scale(0.9); opacity: 0.7; }
}

/* DSP Filter Specifications Ribbon */
.dsp-specs-ribbon {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-surface);
  border: 1px dashed var(--accent-cyan);
  border-radius: 8px;
  padding: 8px 14px;
  margin-bottom: 12px;
  font-size: 0.72rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
  animation: fadeIn 0.25s ease-out;
}

.dsp-badge {
  background: var(--accent-cyan);
  color: #07080a;
  font-weight: 800;
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

.dsp-spec-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.spec-name {
  color: var(--text-primary);
}

.dsp-spec-divider {
  color: var(--border-medium);
}

.chart-wrapper {
  position: relative;
  width: 100%;
  height: 340px;
}

/* ==========================================================================
   4. DIAGNOSTIC LABORATORY & SCENARIO BENCH (PLACED LAST)
   ========================================================================== */
.scenario-sandbox {
  margin-top: 10px;
}

.research-tag {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.sandbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 16px;
}

.sandbox-badge {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  margin-bottom: 2px;
}

.sandbox-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
}

.sandbox-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.preset-pill-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.preset-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 9999px;
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s var(--ease-spring);
}

.preset-btn:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-active);
}

.preset-btn.active {
  background: var(--text-primary);
  color: var(--bg-canvas);
  border-color: var(--text-primary);
}

.preset-btn.alert-preset {
  border-color: rgba(239, 68, 68, 0.4);
  color: #f87171;
}

.preset-btn.alert-preset.active {
  background: #ef4444;
  color: #ffffff;
  border-color: #ef4444;
}

.slider-controls-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  background: var(--bg-tile);
  padding: 18px;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
}

.slider-box {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.slider-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.76rem;
  color: var(--text-secondary);
}

.slider-num {
  font-weight: 700;
  color: var(--text-primary);
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 5px;
  border-radius: 3px;
  background: var(--border-medium);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-primary);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.4);
  transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.2); }

/* ==========================================================================
   Footer
   ========================================================================== */
.masthead-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 28px 16px;
  max-width: 1260px;
  margin: 0 auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
}

.footer-brand {
  font-weight: 800;
  color: var(--text-primary);
  margin-right: 12px;
}

.footer-copy { color: var(--text-muted); }
.footer-links { display: flex; gap: 16px; }
.spec-code { color: var(--text-muted); font-size: 0.72rem; }

/* ==========================================================================
   Responsive Collapse
   ========================================================================== */
@media (max-width: 1100px) {
  .quad-aqi-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .sensor-matrix-grid {
    grid-template-columns: 1fr;
  }
  .slider-controls-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-title { font-size: 1.95rem; }
  .masthead-nav { top: 8px; }
  .nav-inner {
    flex-direction: column;
    gap: 12px;
    border-radius: 20px;
    padding: 12px;
  }
  .quad-aqi-grid {
    grid-template-columns: 1fr;
  }
  .matrix-tiles.four-cols,
  .matrix-tiles.three-cols {
    grid-template-columns: repeat(2, 1fr);
  }
  .slider-controls-grid {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* ==========================================================================
   Secondary Pill & Nav Buttons
   ========================================================================== */
.secondary-pill {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

.secondary-pill:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-active);
  transform: translateY(-1px);
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.formula-link-arrow {
  color: var(--accent-cyan);
  font-weight: 800;
  margin-left: 2px;
}

/* ==========================================================================
   5. THEORETICAL FOUNDATIONS & ALGORITHMIC BLUEPRINT MODAL
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(3, 4, 6, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.25s var(--ease-out), visibility 0.25s var(--ease-out);
}

.modal-backdrop.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

[data-theme="light"] .modal-backdrop {
  background: rgba(15, 23, 42, 0.45);
}

.modal-card {
  max-width: 980px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 60px -10px rgba(0, 0, 0, 0.55);
}

[data-theme="light"] .modal-card {
  box-shadow: 0 24px 60px -10px rgba(0, 0, 0, 0.18);
}

.modal-inner {
  max-height: calc(90vh - 12px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 24px;
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-medium);
}

.modal-header-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.modal-eyebrow {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 6px;
}

.modal-title {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.modal-subtitle {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.modal-close-pill {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.modal-close-pill:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-active);
  transform: rotate(90deg);
}

.theory-nav-strip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 0 14px;
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
  white-space: nowrap;
}

.theory-nav-strip::-webkit-scrollbar {
  height: 4px;
}

.theory-nav-pill {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 9999px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  will-change: transform, box-shadow, border-color;
}

.theory-nav-pill:hover,
.theory-nav-pill.active {
  background: var(--bg-surface-hover);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px -2px rgba(6, 182, 212, 0.38), 0 0 0 1px var(--accent-cyan), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.theory-nav-pill.highlight-pill {
  background: rgba(6, 182, 212, 0.12);
  border-color: rgba(6, 182, 212, 0.35);
  color: var(--accent-cyan);
}

.modal-body-scroll {
  overflow-y: auto;
  padding: 18px 4px 12px 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.modal-body-scroll::-webkit-scrollbar {
  width: 6px;
}

.modal-body-scroll::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 3px;
}

.theory-module {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.module-tag {
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
}

.module-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.theory-para {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.theory-list {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.8;
  padding-left: 18px;
}

.math-box {
  background: var(--bg-tile);
  border: 1px solid var(--border-medium);
  border-left: 3px solid var(--accent-cyan);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 0.82rem;
  color: var(--text-primary);
  overflow-x: auto;
  white-space: pre-wrap;
  line-height: 1.6;
}

.math-subtext {
  font-size: 0.76rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.theory-sub-eval {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.theory-callout {
  padding: 14px 18px;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.alert-callout {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.alert-callout .callout-title {
  color: #f87171;
  font-weight: 800;
  font-size: 0.84rem;
}

.emerald-callout {
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.emerald-callout .callout-title {
  color: var(--c-good);
  font-weight: 800;
  font-size: 0.84rem;
}

.master-callout {
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.master-callout .callout-title {
  color: var(--accent-cyan);
  font-weight: 800;
  font-size: 0.84rem;
}

.callout-text {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.theory-table-wrapper {
  overflow-x: auto;
  border-radius: 10px;
  border: 1px solid var(--border-medium);
}

.theory-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
  text-align: left;
}

.theory-table th {
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  padding: 10px 14px;
  font-weight: 700;
  border-bottom: 1px solid var(--border-medium);
}

.theory-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.theory-table tbody tr:last-child td {
  border-bottom: none;
}

.theory-table tbody tr:hover {
  background: var(--bg-tile);
}

.matrix-table th {
  white-space: nowrap;
}

.table-sub {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.cat-pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 9999px;
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
}

.factor-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.factor-gas { background: rgba(239, 68, 68, 0.15); color: #f87171; }
.factor-pm { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.factor-clean { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.factor-iaq { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.factor-alert { background: rgba(239, 68, 68, 0.22); color: #fca5a5; }
.factor-hazard { background: rgba(168, 85, 247, 0.2); color: #c084fc; }

.engine-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
}

.badge-cpcb { background: rgba(59, 130, 246, 0.12); color: #93c5fd; }
.badge-mamdani { background: rgba(16, 185, 129, 0.12); color: #6ee7b7; }
.badge-sugeno { background: rgba(245, 158, 11, 0.12); color: #fcd34d; }
.badge-effective { background: rgba(6, 182, 212, 0.18); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.4); }
.badge-all { background: rgba(100, 116, 139, 0.18); color: #cbd5e1; }

/* ==========================================================================
   6. CSV DATASET EXPORT CONFIGURATOR MODAL
   ========================================================================== */
.export-modal-container {
  width: 100%;
  max-width: 660px;
  padding: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: modalScaleIn 0.22s var(--ease-spring);
}

.export-modal-card {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 16px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.export-modal-header {
  padding: 18px 22px 14px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  background: var(--bg-surface-elevated);
}

.export-modal-title {
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 4px;
}

.export-modal-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 3px;
}

.export-modal-body {
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-height: 75vh;
  overflow-y: auto;
}

.export-section-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.export-preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
}

.export-preset-card {
  background: var(--bg-tile);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 12px 14px;
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 5px;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  will-change: transform, box-shadow, border-color;
}

.export-preset-card:hover {
  border-color: rgba(6, 182, 212, 0.45);
  background: var(--bg-surface-elevated);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px -3px rgba(0, 0, 0, 0.35);
}

.export-preset-card.active {
  border-color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.12);
  transform: translateY(-3.5px);
  box-shadow: 0 10px 24px -4px rgba(6, 182, 212, 0.42), 0 0 0 1.5px var(--accent-cyan), inset 0 1.5px 0 0 rgba(255, 255, 255, 0.3);
}

[data-theme="light"] .export-preset-card.active {
  background: #ffffff;
  border-color: #0891b2;
  box-shadow: 0 10px 22px -3px rgba(8, 145, 178, 0.32), 0 0 0 1.5px #0891b2, inset 0 1.5px 0 0 rgba(255, 255, 255, 0.9);
}

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

.preset-name {
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--text-primary);
}

.preset-tag {
  font-size: 0.62rem;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-surface-elevated);
  color: var(--text-muted);
}

.export-preset-card.active .preset-tag {
  background: rgba(6, 182, 212, 0.22);
  color: var(--accent-cyan);
}

.preset-detail {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.preset-res {
  font-size: 0.68rem;
  color: var(--accent-cyan);
  margin-top: 4px;
}

.export-custom-row {
  display: flex;
  gap: 14px;
  background: var(--bg-tile);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 12px 16px;
  animation: fadeIn 0.2s ease-out;
}

.export-custom-row.hidden { display: none; }

.export-date-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.field-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
}

.export-channels-checklist {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-tile);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 12px 16px;
}

.export-checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.76rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.export-checkbox-label input[type="checkbox"] {
  accent-color: var(--accent-cyan);
  margin-top: 2px;
  cursor: pointer;
}

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

.export-summary-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.72rem;
}

.summary-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.summary-val {
  color: var(--accent-cyan);
}

.export-modal-footer {
  padding: 14px 22px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface-elevated);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.modal-cancel-btn {
  background: transparent;
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
}

.modal-cancel-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.export-confirm-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  font-size: 0.8rem;
  background: var(--accent-cyan);
  color: #07080a;
  border: 1px solid var(--accent-cyan);
  font-weight: 700;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.export-confirm-btn:hover {
  opacity: 0.92;
  box-shadow: 0 0 16px rgba(6, 182, 212, 0.4);
}

/* ==========================================================================
   7. KATEX MATHEMATICAL FORMULA POLISH (LIGHT / DARK SYSTEM)
   ========================================================================== */
.tex-box {
  background: var(--bg-tile);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 12px 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.katex {
  font-size: 1.08em;
  color: var(--text-primary);
}

.katex-display {
  margin: 0.35em 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 4px 0;
}

[data-theme="light"] .katex {
  color: #0f172a;
}

[data-theme="light"] .tex-box {
  background: #f8fafc;
  border-color: #cbd5e1;
}

.math-subtext {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 6px;
  overflow-x: auto;
}

@media (max-width: 640px) {
  .export-preset-grid {
    grid-template-columns: 1fr;
  }
  .export-custom-row {
    flex-direction: column;
  }
}