/* ============================================
   VitalPet — Styles
   Nightwatch Nurse Co.
   Dark navy lofi aesthetic, mobile-first
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ============================================
   NIGHTWATCH SUITE — Brand Variables
   Nightwatch Nurse Co. · "Carry the light."
   ============================================ */
:root {
  --nw-bg:        #0d0d1a;  /* deep navy/near-black */
  --nw-accent:    #f5a623;  /* warm amber/lantern flame */
  --nw-gold:      #e8c97a;  /* soft gold */
  --nw-cream:     #f0ece0;  /* warm cream text */
  --nw-danger:    #c0392b;  /* alert/danger */
  --nw-success:   #2ecc71;  /* success */
  --nw-suite-bg:  rgba(13,13,26,0.95);
  --nw-suite-border: rgba(245,166,35,0.3);
}

/* Nightwatch Suite Footer */
.nightwatch-suite-footer {
  background: var(--nw-bg);
  color: var(--nw-cream);
  text-align: center;
  padding: 12px 20px;
  font-size: 0.8rem;
  border-top: 1px solid var(--nw-suite-border);
}
.nightwatch-suite-footer a {
  color: var(--nw-accent);
  text-decoration: none;
}
.nightwatch-suite-footer a:hover { text-decoration: underline; }

/* ============================================ */

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

:root {
  --navy: #0a1628;
  --navy-light: #111d35;
  --navy-mid: #162544;
  --teal: #00b4a0;
  --teal-glow: rgba(0, 180, 160, 0.25);
  --teal-dim: #008f7e;
  --amber: #f59e0b;
  --amber-glow: rgba(245, 158, 11, 0.2);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --danger: #ef4444;
  --success: #22c55e;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-sm: 0 2px 12px rgba(0,0,0,0.2);
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--navy);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a { color: var(--teal); text-decoration: none; transition: color var(--transition); }
a:hover { color: #33c9b8; }

img { max-width: 100%; display: block; }

/* --- Utility --- */
.container { max-width: 1140px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.text-teal { color: var(--teal); }
.text-amber { color: var(--amber); }
.text-dim { color: var(--text-dim); }
.text-muted { color: var(--text-muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ============================================
   NAVIGATION (shared)
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  padding: 0 20px;
}
.nav-inner {
  max-width: 1140px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.nav-brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--teal);
  letter-spacing: -0.5px;
}
.nav-tagline {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 400;
  display: none;
}
@media (min-width: 480px) {
  .nav-tagline { display: inline; }
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}
.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-dim);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--teal);
  color: var(--navy);
}
.btn-primary:hover {
  background: #33c9b8;
  color: var(--navy);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--teal-glow);
}
.btn-secondary {
  background: transparent;
  color: var(--teal);
  border: 1.5px solid var(--teal);
}
.btn-secondary:hover {
  background: var(--teal-glow);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  padding: 8px 14px;
}
.btn-ghost:hover { color: var(--text); }
.btn-sm { padding: 7px 16px; font-size: 0.8rem; }
.btn-lg { padding: 14px 32px; font-size: 1rem; }

/* ============================================
   LANDING PAGE
   ============================================ */

/* --- Hero --- */
.hero {
  position: relative;
  padding: 80px 20px 60px;
  text-align: center;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  background-size: 200px;
  pointer-events: none;
  z-index: 0;
}
.hero > * { position: relative; z-index: 1; }

.hero h1 {
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  max-width: 700px;
  margin: 0 auto 16px;
}
.hero-sub {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-dim);
  max-width: 580px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* Pet preview placeholder */
.hero-pet {
  width: 120px;
  height: 120px;
  margin: 0 auto 32px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--teal-glow) 0%, transparent 70%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  animation: petBounce 2.5s ease-in-out infinite;
  box-shadow: 0 0 40px var(--teal-glow);
}
@keyframes petBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero-ctas {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.hero-trust {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-style: italic;
}

/* --- Section shared --- */
.section {
  padding: 60px 20px;
}
.section-header {
  text-align: center;
  margin-bottom: 40px;
}
.section-header h2 {
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  font-weight: 800;
  margin-bottom: 12px;
}
.section-header p {
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto;
  font-size: 0.95rem;
}

/* --- Problem section --- */
.problem { background: var(--navy-light); }
.problem-lead {
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  text-align: center;
  max-width: 640px;
  margin: 0 auto 32px;
  color: var(--text-dim);
  line-height: 1.7;
}
.pain-points {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  max-width: 800px;
  margin: 0 auto 32px;
}
.pain-point {
  background: var(--navy);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 24px;
}
.pain-point .icon { font-size: 1.4rem; margin-bottom: 10px; }
.pain-point h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; }
.pain-point p { font-size: 0.85rem; color: var(--text-dim); }
.problem-transition {
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-dim);
  font-style: italic;
  max-width: 600px;
  margin: 0 auto;
}

/* --- Science section --- */
.science { background: var(--navy); }

.bio-card {
  background: var(--navy-light);
  border: 1px solid rgba(0, 180, 160, 0.15);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 700px;
  margin: 0 auto 40px;
  position: relative;
}
.bio-card::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px; right: -1px; bottom: -1px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--teal-glow), transparent 50%);
  z-index: -1;
}
.bio-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--teal);
  margin-bottom: 12px;
}
.bio-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}
.bio-credentials {
  list-style: none;
  margin-bottom: 16px;
}
.bio-credentials li {
  font-size: 0.88rem;
  color: var(--text-dim);
  padding: 3px 0;
  padding-left: 18px;
  position: relative;
}
.bio-credentials li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--teal);
}
.bio-story {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.7;
  font-style: italic;
}

/* Family story */
.family-story {
  background: var(--navy-light);
  border-left: 3px solid var(--teal);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 28px 32px;
  max-width: 700px;
  margin: 0 auto 40px;
}
.family-story blockquote {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text);
  font-style: italic;
}
.family-story cite {
  display: block;
  margin-top: 12px;
  font-size: 0.8rem;
  font-style: normal;
  color: var(--text-muted);
}

.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  max-width: 960px;
  margin: 0 auto 40px;
}
.pillar {
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition);
}
.pillar:hover { border-color: rgba(0,180,160,0.2); }
.pillar .icon { font-size: 1.6rem; margin-bottom: 12px; }
.pillar h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.pillar p { font-size: 0.88rem; color: var(--text-dim); line-height: 1.6; }

.science-quote {
  text-align: center;
  max-width: 650px;
  margin: 0 auto;
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.7;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 28px;
}

/* --- Features section --- */
.features { background: var(--navy-light); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
}
.feature-card {
  background: var(--navy);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.feature-card .icon { font-size: 1.5rem; margin-bottom: 12px; }
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 0.85rem; color: var(--text-dim); line-height: 1.6; }

/* --- Pricing section --- */
.pricing { background: var(--navy); }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  max-width: 960px;
  margin: 0 auto 24px;
}
.pricing-card {
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: border-color var(--transition);
}
.pricing-card.featured {
  border-color: var(--teal);
  position: relative;
}
.pricing-card.featured::after {
  content: 'Most Popular';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--teal);
  color: var(--navy);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.pricing-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.pricing-amount {
  font-size: 2rem;
  font-weight: 800;
  color: var(--teal);
  margin-bottom: 4px;
}
.pricing-period {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 20px;
}
.pricing-features li {
  font-size: 0.85rem;
  color: var(--text-dim);
  padding: 5px 0;
  padding-left: 20px;
  position: relative;
}
.pricing-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--teal);
  font-weight: 700;
}
.pricing-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 600;
}

/* --- Social proof --- */
.social-proof {
  background: var(--navy-light);
  text-align: center;
  padding: 40px 20px;
}
.social-proof p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: center;
  padding: 32px 20px;
}
.footer p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.footer a { color: var(--teal); }

/* ============================================
   APP (index.html)
   ============================================ */

/* --- App nav --- */
.app-nav {
  height: 56px;
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.app-nav-left {
  display: flex;
  align-items: center;
  gap: 16px;
}
.app-nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.mini-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-dim);
}
.mini-hunger-bar {
  width: 48px;
  height: 6px;
  background: var(--navy-mid);
  border-radius: 3px;
  overflow: hidden;
}
.mini-hunger-fill {
  height: 100%;
  background: var(--teal);
  border-radius: 3px;
  transition: width 0.5s ease;
}
.mini-hunger-fill.low { background: var(--amber); }
.mini-hunger-fill.critical { background: var(--danger); }

.app-icon-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.app-icon-btn:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.app-icon-btn.active { color: var(--teal); }

/* --- App layout --- */
.app-layout {
  display: grid;
  grid-template-columns: 1fr;
  min-height: calc(100vh - 56px);
}
@media (min-width: 768px) {
  .app-layout {
    grid-template-columns: 30% 70%;
  }
}

/* --- Left panel: Pet --- */
.pet-panel {
  background: var(--navy);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-right: 1px solid rgba(255,255,255,0.06);
}
.pet-display {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}
/* Mobile: collapse pet panel */
@media (max-width: 767px) {
  .pet-panel {
    border-right: none;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: 16px;
  }
  .pet-display { min-height: 140px; }
}

/* --- Progress panel --- */
.progress-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.xp-bar-wrapper {
  background: var(--navy-mid);
  border-radius: 6px;
  height: 10px;
  overflow: hidden;
}
.xp-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--amber));
  border-radius: 6px;
  transition: width 0.5s ease;
}
.xp-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}
.category-bars { display: flex; flex-direction: column; gap: 6px; }
.cat-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
}
.cat-bar-label {
  width: 80px;
  color: var(--text-dim);
  text-transform: uppercase;
  font-weight: 600;
  font-size: 0.65rem;
  letter-spacing: 0.5px;
}
.cat-bar-track {
  flex: 1;
  height: 6px;
  background: var(--navy-mid);
  border-radius: 3px;
  overflow: hidden;
}
.cat-bar-fill {
  height: 100%;
  background: var(--teal);
  border-radius: 3px;
  transition: width 0.5s ease;
}
.session-stats {
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.session-stats span { font-weight: 600; color: var(--text-dim); }

/* --- Right panel: Study area --- */
.study-panel {
  background: var(--navy);
  padding: 24px;
  overflow-y: auto;
}

/* Category selection */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}
.category-card {
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
}
.category-card:hover {
  border-color: var(--teal);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,180,160,0.1);
}
.category-card .cat-icon { font-size: 1.6rem; margin-bottom: 8px; }
.category-card h3 { font-size: 0.88rem; font-weight: 700; margin-bottom: 4px; }
.category-card .mastery {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.category-card .q-count {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.mode-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

/* Question display */
.question-area { max-width: 720px; }
.question-stem {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 24px;
  padding: 20px;
  background: var(--navy-light);
  border-radius: var(--radius);
  border-left: 3px solid var(--teal);
}
#ecg-canvas-mount {
  background: var(--navy-light);
  border-radius: var(--radius);
  margin-bottom: 16px;
  min-height: 0;
  overflow: hidden;
}
#ecg-canvas-mount:empty { display: none; }

.answer-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}
.answer-btn {
  display: block;
  width: 100%;
  padding: 14px 18px;
  background: var(--navy-light);
  border: 1.5px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition);
  line-height: 1.5;
}
.answer-btn:hover {
  border-color: var(--teal);
  background: rgba(0,180,160,0.05);
}
.answer-btn.selected {
  border-color: var(--teal);
  background: rgba(0,180,160,0.1);
}
.answer-btn.correct {
  border-color: var(--success);
  background: rgba(34,197,94,0.1);
}
.answer-btn.correct::after {
  content: ' ✓';
  color: var(--success);
  font-weight: 700;
}
.answer-btn.incorrect {
  border-color: var(--danger);
  background: rgba(239,68,68,0.08);
}
.answer-btn.incorrect::after {
  content: ' ✗';
  color: var(--danger);
  font-weight: 700;
}
.answer-btn:disabled { cursor: default; }
.answer-btn:disabled:hover {
  transform: none;
  box-shadow: none;
}

.explanation-box {
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  display: none;
}
.explanation-box.visible { display: block; }
.explanation-box h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--teal);
  margin-bottom: 8px;
}
.explanation-box p {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.6;
}
.xp-gained {
  font-size: 0.8rem;
  color: var(--amber);
  font-weight: 700;
  margin-top: 8px;
}

/* --- Audio controls (floating) --- */
.audio-controls {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--navy-light);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow);
  z-index: 90;
  transition: all var(--transition);
}
.audio-controls.collapsed {
  padding: 10px;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  justify-content: center;
}
.audio-controls.collapsed .audio-modes,
.audio-controls.collapsed .audio-volume,
.audio-controls.collapsed .audio-info { display: none; }

.audio-toggle-btn {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 2px;
  color: var(--text-dim);
  transition: color var(--transition);
  flex-shrink: 0;
}
.audio-toggle-btn:hover { color: var(--text); }
.audio-toggle-btn.active { color: var(--teal); }

.audio-modes {
  display: flex;
  gap: 4px;
}
.audio-mode-btn {
  background: none;
  border: 1px solid transparent;
  font-size: 0.9rem;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
  transition: all var(--transition);
  color: var(--text-dim);
}
.audio-mode-btn:hover { background: rgba(255,255,255,0.05); }
.audio-mode-btn.active {
  border-color: var(--teal);
  color: var(--teal);
}

.audio-volume {
  width: 60px;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--navy-mid);
  border-radius: 2px;
  outline: none;
}
.audio-volume::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  background: var(--teal);
  border-radius: 50%;
  cursor: pointer;
}

.audio-info {
  position: relative;
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: help;
}
.audio-info .tooltip {
  display: none;
  position: absolute;
  bottom: 100%;
  right: 0;
  background: var(--navy);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  width: 240px;
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.5;
  box-shadow: var(--shadow);
  margin-bottom: 8px;
}
.audio-info:hover .tooltip { display: block; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 767px) {
  .section { padding: 40px 16px; }
  .hero { padding: 50px 16px 40px; }
  .nav-links .hide-mobile { display: none; }
  .study-panel { padding: 16px; }
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 360px;
  }
  .audio-controls {
    bottom: 12px;
    right: 12px;
  }
}

@media (max-width: 374px) {
  .category-grid { grid-template-columns: 1fr; }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up {
  animation: fadeInUp 0.5s ease forwards;
}

@keyframes pulse-teal {
  0%, 100% { box-shadow: 0 0 0 0 var(--teal-glow); }
  50% { box-shadow: 0 0 0 12px transparent; }
}
.pulse-teal { animation: pulse-teal 2s ease-in-out infinite; }

/* ============================================
   FREEMIUM — Gate, Modal, Badges
   ============================================ */

/* Pro badge — fixed corner */
.pro-badge {
  position: fixed;
  top: 12px;
  right: 60px;
  background: linear-gradient(135deg, #f5a623, #e8870a);
  color: #1a1a2e;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: 20px;
  z-index: 1100;
  pointer-events: none;
  box-shadow: 0 2px 8px rgba(245,166,35,0.4);
}

/* Flame dim when daily limit hit */
.flame-dimmed {
  filter: brightness(0.45) saturate(0.5) !important;
  transition: filter 0.8s ease;
}

/* Soft-gate overlay — sits above content, blurs behind */
.content-blurred {
  filter: blur(4px);
  pointer-events: none;
  user-select: none;
  transition: filter 0.3s ease;
}

.soft-gate-overlay {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 10, 20, 0.55);
  backdrop-filter: blur(2px);
  animation: fadeInUp 0.3s ease forwards;
}

.soft-gate-inner {
  background: var(--bg-card, #1e1e38);
  border: 1px solid rgba(245,166,35,0.25);
  border-radius: 16px;
  padding: 36px 28px;
  max-width: 420px;
  width: 90%;
  text-align: center;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}

.soft-gate-flame {
  font-size: 2.4rem;
  margin-bottom: 12px;
}

.soft-gate-copy {
  color: var(--text-primary, #e8e8f0);
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 20px;
}

.soft-gate-inner .btn { margin: 6px 4px; }

/* Upgrade modal overlay */
.upgrade-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(10, 10, 20, 0.72);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeInUp 0.25s ease forwards;
  padding: 16px;
  overflow-y: auto;
}

.upgrade-modal {
  background: var(--bg-card, #1e1e38);
  border: 1px solid rgba(245,166,35,0.3);
  border-radius: 20px;
  padding: 36px 28px 28px;
  max-width: 680px;
  width: 100%;
  position: relative;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
}

.upgrade-modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-secondary, #888);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: color 0.2s;
}
.upgrade-modal-close:hover { color: var(--text-primary, #e8e8f0); }

.upgrade-modal-header {
  text-align: center;
  margin-bottom: 28px;
}
.upgrade-flame { font-size: 2.2rem; margin-bottom: 8px; }
.upgrade-modal-header h2 {
  color: var(--text-primary, #e8e8f0);
  margin: 0 0 8px;
  font-size: 1.4rem;
}
.upgrade-prompt-copy {
  color: var(--text-secondary, #aaa);
  font-size: 0.9rem;
  line-height: 1.5;
  max-width: 480px;
  margin: 0 auto;
}

/* Pricing cards row */
.pricing-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}

@media (max-width: 560px) {
  .pricing-cards { grid-template-columns: 1fr; }
}

.pricing-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 14px;
  padding: 22px 16px;
  text-align: center;
  position: relative;
  transition: border-color 0.2s, transform 0.2s;
}
.pricing-card:hover {
  border-color: rgba(245,166,35,0.4);
  transform: translateY(-2px);
}
.pricing-card--featured {
  border-color: rgba(245,166,35,0.5);
  background: rgba(245,166,35,0.07);
}
.pricing-card--lifetime {
  border-color: rgba(180,100,255,0.4);
  background: rgba(180,100,255,0.06);
  overflow: hidden;
}

/* Savings badge */
.plan-badge-savings {
  position: absolute;
  top: -1px;
  right: 12px;
  background: #f5a623;
  color: #1a1a2e;
  font-size: 0.65rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 0 0 8px 8px;
  letter-spacing: 0.04em;
}

/* Lifetime ribbon */
.plan-ribbon {
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 5px 12px;
  margin: -22px -16px 14px;
  text-align: center;
  letter-spacing: 0.03em;
}

.plan-label {
  color: var(--text-secondary, #aaa);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.plan-price {
  color: var(--text-primary, #e8e8f0);
  font-size: 1.7rem;
  font-weight: 800;
  margin-bottom: 4px;
}
.plan-period {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-secondary, #999);
}
.plan-subtext {
  color: var(--text-secondary, #999);
  font-size: 0.75rem;
  margin-bottom: 14px;
}

.btn-upgrade { width: 100%; margin-top: 8px; font-size: 0.85rem; }

/* Institutional CTA */
.institutional-cta {
  text-align: center;
  color: var(--text-secondary, #888);
  font-size: 0.82rem;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,0.07);
}
.institutional-cta a {
  color: var(--accent, #f5a623);
  text-decoration: none;
}
.institutional-cta a:hover { text-decoration: underline; }