/* ══════════════════════════════════════════════════════════════════
   Zoology Master — Premium Landing Page CSS
   2026 Design System · Green (#10b981) & Teal (#06b6d4) Brand Theme
   Full Dark + Light Theme Support
   THERABApps
══════════════════════════════════════════════════════════════════ */

/* ─── DARK THEME TOKENS (default) ──────────────────────────────── */
:root {
  /* Backgrounds */
  --bg-primary:        #020f0a;
  --bg-secondary:      #071a10;
  --bg-card:           rgba(16,185,129,0.05);
  --bg-card-solid:     #0d1f16;
  --bg-glass:          rgba(2,15,10,0.88);
  --bg-icon:           rgba(16,185,129,0.12);
  --bg-icon-neutral:   rgba(255,255,255,0.06);
  --bg-input:          rgba(255,255,255,0.04);
  --bg-sidebar:        rgba(0,0,0,0.25);
  /* Section-specific backgrounds */
  --bg-phone-screen:   #010d07;
  --bg-stats-section:  #041408;
  --bg-footer:         #010d07;
  --bg-dl-screen:      #010d07;

  /* Borders */
  --border:            rgba(16,185,129,0.14);
  --border-glow:       rgba(16,185,129,0.50);
  --border-subtle:     rgba(255,255,255,0.07);

  /* Text */
  --text-primary:      #f0fdf4;
  --text-secondary:    #a7c4b5;
  --text-muted:        #5a8c72;
  --text-on-accent:    #ffffff;

  /* Accents */
  --accent-green:      #10b981;
  --accent-teal:       #06b6d4;
  --accent-lime:       #84cc16;

  /* Gradients */
  --grad-primary:      linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
  --grad-hero:         linear-gradient(135deg, #020f0a 0%, #071a10 60%, #020f0a 100%);
  --grad-download:     linear-gradient(135deg, #041408 0%, #071a10 50%, #041408 100%);
  --grad-stats:        linear-gradient(135deg, #041408, #071a10);

  /* Shadows */
  --shadow-glow:       0 0 60px rgba(16,185,129,0.20);
  --shadow-card:       0 8px 32px rgba(0,0,0,0.55);
  --shadow-float:      0 8px 24px rgba(0,0,0,0.40);
  --shadow-nav:        0 4px 24px rgba(0,0,0,0.40);
  --shadow-phone:      0 40px 80px rgba(16,185,129,0.25);
  --shadow-inset:      inset 0 1px 0 rgba(255,255,255,0.08);
  --shadow-download:   0 12px 48px rgba(16,185,129,0.28);

  /* Theme-preview palette (dark) */
  --tp-bg:             #020f0a;
  --tp-sidebar-bg:     rgba(255,255,255,0.03);
  --tp-sidebar-border: rgba(255,255,255,0.05);
  --tp-nav-color:      rgba(255,255,255,0.40);
  --tp-card-bg:        rgba(255,255,255,0.04);
  --tp-card-border:    rgba(255,255,255,0.06);
  --tp-card-title:     #f0fdf4;
  --tp-card-sub:       rgba(255,255,255,0.35);
  --tp-title-color:    rgba(255,255,255,0.50);
  --tp-header-bg:      rgba(255,255,255,0.05);
  --tp-header-border:  rgba(255,255,255,0.05);

  /* Radii */
  --radius-sm:   8px;
  --radius-md:   16px;
  --radius-lg:   24px;
  --radius-xl:   32px;
  --radius-full: 9999px;

  /* Transitions */
  --transition:        all 0.3s cubic-bezier(0.4,0,0.2,1);
  --transition-bounce: all 0.4s cubic-bezier(0.34,1.56,0.64,1);
}

/* ─── LIGHT THEME TOKENS ────────────────────────────────────────── */
[data-theme="light"] {
  /* Backgrounds */
  --bg-primary:        #f0fdf4;
  --bg-secondary:      #dcfce7;
  --bg-card:           rgba(16,185,129,0.06);
  --bg-card-solid:     #ffffff;
  --bg-glass:          rgba(240,253,244,0.95);
  --bg-icon:           rgba(16,185,129,0.10);
  --bg-icon-neutral:   rgba(0,0,0,0.05);
  --bg-input:          rgba(0,0,0,0.04);
  --bg-sidebar:        rgba(255,255,255,0.70);
  /* Section-specific backgrounds */
  --bg-phone-screen:   #e8f5e9;
  --bg-stats-section:  #bbf7d0;
  --bg-footer:         #d1fae5;
  --bg-dl-screen:      #e8f5e9;

  /* Borders */
  --border:            rgba(16,185,129,0.22);
  --border-glow:       rgba(16,185,129,0.50);
  --border-subtle:     rgba(0,0,0,0.09);

  /* Text */
  --text-primary:      #052e16;
  --text-secondary:    #166534;
  --text-muted:        #4b7a60;
  --text-on-accent:    #ffffff;

  /* Accents */
  --accent-green:      #059669;
  --accent-teal:       #0891b2;
  --accent-lime:       #65a30d;

  /* Gradients */
  --grad-primary:      linear-gradient(135deg, #059669 0%, #0891b2 100%);
  --grad-download:     linear-gradient(135deg, #bbf7d0 0%, #a7f3d0 50%, #bbf7d0 100%);
  --grad-stats:        linear-gradient(135deg, #bbf7d0, #d1fae5);

  /* Shadows */
  --shadow-glow:       0 0 60px rgba(16,185,129,0.20);
  --shadow-card:       0 4px 20px rgba(0,0,0,0.10);
  --shadow-float:      0 4px 16px rgba(0,0,0,0.10);
  --shadow-nav:        0 2px 16px rgba(0,0,0,0.12);
  --shadow-phone:      0 30px 60px rgba(16,185,129,0.22);
  --shadow-inset:      inset 0 1px 0 rgba(255,255,255,0.80);
  --shadow-download:   0 8px 32px rgba(16,185,129,0.22);

  /* Theme-preview palette (light) */
  --tp-bg:             #f0fdf4;
  --tp-sidebar-bg:     rgba(0,0,0,0.03);
  --tp-sidebar-border: rgba(0,0,0,0.06);
  --tp-nav-color:      rgba(0,0,0,0.40);
  --tp-card-bg:        rgba(0,0,0,0.03);
  --tp-card-border:    rgba(0,0,0,0.07);
  --tp-card-title:     #052e16;
  --tp-card-sub:       rgba(0,0,0,0.38);
  --tp-title-color:    rgba(0,0,0,0.45);
  --tp-header-bg:      rgba(0,0,0,0.04);
  --tp-header-border:  rgba(0,0,0,0.06);
}

/* ─── RESET & BASE ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: 'Outfit', 'Plus Jakarta Sans', 'Inter', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── SCREEN READER ONLY ────────────────────────────────────────── */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ─── SCROLL PROGRESS ───────────────────────────────────────────── */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: var(--grad-primary);
  z-index: 9999;
  transition: width 0.1s linear;
}

/* ══════════════════════════════════════════════════════════════════
   PRELOADER
══════════════════════════════════════════════════════════════════ */
#preloader {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
#preloader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

.preloader-inner { text-align: center; }
.preloader-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  animation: preloaderBounce 0.8s ease-in-out infinite alternate;
}
.preloader-bar {
  width: 200px;
  height: 4px;
  background: var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 0 auto 0.75rem;
}
.preloader-fill {
  height: 100%;
  background: var(--grad-primary);
  border-radius: var(--radius-full);
  animation: preloaderFill 1.8s ease-in-out forwards;
}
.preloader-text {
  color: var(--text-secondary);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

@keyframes preloaderBounce {
  from { transform: translateY(0) scale(1); }
  to   { transform: translateY(-12px) scale(1.1); }
}
@keyframes preloaderFill {
  0%   { width: 0%; }
  60%  { width: 80%; }
  100% { width: 100%; }
}

/* ══════════════════════════════════════════════════════════════════
   NAVBAR
══════════════════════════════════════════════════════════════════ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}
.navbar.scrolled {
  box-shadow: var(--shadow-nav);
  border-bottom-color: var(--border);
}

.nav-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.nav-logo-icon { font-size: 1.5rem; }
.logo-accent { color: var(--accent-green); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: var(--bg-card);
}
.nav-link.active { color: var(--accent-green); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.theme-toggle {
  width: 40px; height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-icon-neutral);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
}
.theme-toggle:hover {
  background: var(--bg-icon);
  color: var(--accent-green);
  border-color: var(--border);
}

.btn-nav-download {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: var(--grad-primary);
  color: var(--text-on-accent);
  font-size: 0.875rem;
  font-weight: 600;
  transition: var(--transition-bounce);
  box-shadow: 0 4px 16px rgba(16,185,129,0.30);
}
.btn-nav-download:hover {
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 8px 24px rgba(16,185,129,0.40);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ══════════════════════════════════════════════════════════════════
   HERO SECTION
══════════════════════════════════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 64px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
}
.blob-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #10b981, transparent);
  top: -200px; right: -100px;
  animation: blobFloat 8s ease-in-out infinite;
}
.blob-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #06b6d4, transparent);
  bottom: -100px; left: -100px;
  animation: blobFloat 10s ease-in-out infinite reverse;
}
.blob-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, #84cc16, transparent);
  top: 40%; left: 30%;
  animation: blobFloat 12s ease-in-out infinite 2s;
}
@keyframes blobFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%  { transform: translate(30px, -20px) scale(1.05); }
  66%  { transform: translate(-20px, 30px) scale(0.95); }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(16,185,129,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16,185,129,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* DNA Helix */
.dna-helix {
  position: absolute;
  right: 8%;
  top: 10%;
  width: 40px;
  height: 300px;
  opacity: 0.15;
}
.dna-strand {
  position: absolute;
  width: 100%;
  height: 100%;
  border-left: 2px dashed var(--accent-green);
  border-radius: 50%;
}
.strand-1 { transform: rotateY(0deg); animation: dnaSpin 4s linear infinite; }
.strand-2 { transform: rotateY(60deg); animation: dnaSpin 4s linear infinite reverse; }
@keyframes dnaSpin {
  from { transform: rotateY(0deg) skewX(0deg); }
  to   { transform: rotateY(360deg) skewX(10deg); }
}

/* Animal silhouettes */
.animal-silhouettes { position: absolute; inset: 0; overflow: hidden; }
.silhouette {
  position: absolute;
  font-size: 2rem;
  opacity: 0.06;
  animation: silhouetteDrift 15s ease-in-out infinite;
}
.s1 { top: 15%; left: 5%;   animation-delay: 0s; font-size: 2.5rem; }
.s2 { top: 70%; left: 2%;   animation-delay: 2s; font-size: 3rem; }
.s3 { top: 30%; right: 5%;  animation-delay: 4s; }
.s4 { bottom: 20%; right: 8%; animation-delay: 1s; font-size: 2.5rem; }
.s5 { top: 55%; left: 15%;  animation-delay: 3s; }
.s6 { top: 80%; right: 20%; animation-delay: 5s; }
@keyframes silhouetteDrift {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%  { transform: translateY(-20px) rotate(5deg); }
}

/* Bio particles */
.bio-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.bio-particle {
  position: absolute;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent-green);
  opacity: 0;
  animation: particleFloat linear infinite;
}
@keyframes particleFloat {
  0%   { opacity: 0; transform: translateY(0) scale(0); }
  10%  { opacity: 0.6; transform: translateY(-20px) scale(1); }
  90%  { opacity: 0.3; }
  100% { opacity: 0; transform: translateY(-120px) scale(0.3); }
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent-green);
  margin-bottom: 20px;
}
.eyebrow-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%  { transform: scale(1.4); opacity: 0.6; }
}

.hero-heading {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
}
.hero-line-1 { display: block; color: var(--text-primary); }
.hero-line-2 { display: block; color: var(--text-primary); }
.hero-line-3 { display: block; color: var(--text-primary); }

.gradient-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.gradient-text-bio {
  background: linear-gradient(135deg, #84cc16, #10b981);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 28px;
}
.stat-chip { text-align: center; }
.stat-val {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-green);
}
.stat-lbl {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border-subtle);
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  background: var(--grad-primary);
  color: var(--text-on-accent);
  font-weight: 700;
  font-size: 0.95rem;
  transition: var(--transition-bounce);
  box-shadow: 0 6px 24px rgba(16,185,129,0.35);
}
.btn-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 32px rgba(16,185,129,0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  background: var(--bg-card);
}
.btn-secondary:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
  transform: translateY(-2px);
}

.hero-trust {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.trust-item i { color: var(--accent-green); }
.trust-sep { color: var(--border-subtle); }

/* ── Phone Mockup ─────────────────────────────────────────────── */
.hero-visual { position: relative; display: flex; justify-content: center; }

.phone-mockup-wrapper {
  position: relative;
  width: 300px;
}

.phone-glow {
  position: absolute;
  inset: -40px;
  background: radial-gradient(ellipse at center, rgba(16,185,129,0.20), transparent 70%);
  border-radius: 50%;
  animation: glowPulse 3s ease-in-out infinite;
  pointer-events: none;
}
@keyframes glowPulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50%  { opacity: 1; transform: scale(1.05); }
}

.phone-mockup {
  width: 280px;
  background: var(--bg-card-solid);
  border-radius: 44px;
  padding: 14px;
  border: 2px solid var(--border);
  box-shadow: var(--shadow-phone);
  position: relative;
  z-index: 1;
  margin: 0 auto;
}
.phone-notch {
  width: 80px; height: 22px;
  background: var(--bg-primary);
  border-radius: 0 0 14px 14px;
  margin: 0 auto 10px;
}
.phone-screen {
  border-radius: 28px;
  overflow: hidden;
  background: var(--bg-phone-screen);
}

/* App screen content */
.app-screen { padding: 14px 12px; font-size: 0.7rem; }

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.app-header-left { display: flex; align-items: center; gap: 8px; }
.app-logo-mini { font-size: 1.1rem; }
.app-title-mini { font-size: 0.72rem; font-weight: 700; color: var(--accent-green); }
.app-subtitle-mini { font-size: 0.6rem; color: var(--text-muted); }
.app-header-right { display: flex; gap: 6px; }
.app-icon-btn {
  width: 26px; height: 26px;
  border-radius: var(--radius-sm);
  background: var(--bg-icon);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.65rem;
}

.app-continue-card {
  background: var(--bg-icon);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px;
  margin-bottom: 10px;
}
.continue-label { font-size: 0.58rem; color: var(--accent-teal); font-weight: 600; margin-bottom: 2px; }
.continue-topic { font-size: 0.7rem; font-weight: 700; color: var(--text-primary); }
.continue-sub { font-size: 0.58rem; color: var(--text-muted); margin-bottom: 6px; }
.continue-bar {
  height: 3px; background: var(--border-subtle);
  border-radius: var(--radius-full); overflow: hidden; margin-bottom: 3px;
}
.continue-fill { height: 100%; background: var(--grad-primary); border-radius: var(--radius-full); }
.continue-pct { font-size: 0.58rem; color: var(--accent-green); font-weight: 600; }

.app-quick-row {
  display: flex; gap: 6px; margin-bottom: 10px;
}
.quick-btn {
  flex: 1;
  background: var(--bg-icon);
  border-radius: var(--radius-sm);
  padding: 6px 4px;
  text-align: center;
  font-size: 0.9rem;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
}
.quick-btn span { font-size: 0.55rem; color: var(--text-secondary); }

.app-section-label {
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.app-topic-list { display: flex; flex-direction: column; gap: 4px; margin-bottom: 10px; }
.app-topic-item {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--bg-icon-neutral);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
}
.topic-icon { font-size: 0.9rem; }
.topic-info { flex: 1; }
.topic-name { font-size: 0.62rem; font-weight: 600; color: var(--text-primary); }
.topic-meta { font-size: 0.55rem; color: var(--text-muted); }
.topic-arrow { font-size: 0.9rem; color: var(--text-muted); }

.app-bottom-nav {
  display: flex;
  border-top: 1px solid var(--border-subtle);
  padding-top: 8px;
  gap: 4px;
}
.app-nav-item {
  flex: 1;
  text-align: center;
  font-size: 0.85rem;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  opacity: 0.5;
}
.app-nav-item.active { opacity: 1; }
.app-nav-item span { font-size: 0.52rem; color: var(--accent-green); }
.app-nav-item.active span { color: var(--accent-green); }

/* Floating cards */
.float-card {
  position: absolute;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-float);
  min-width: 150px;
  z-index: 2;
}
.fc-1 { top: 0px;   left: -90px;  animation: floatCard 4s ease-in-out infinite; }
.fc-2 { top: 80px;  right: -80px; animation: floatCard 5s ease-in-out infinite 0.5s; }
.fc-3 { top: 200px; left: -80px;  animation: floatCard 4.5s ease-in-out infinite 1s; }
.fc-4 { bottom: 80px; right: -75px; animation: floatCard 5.5s ease-in-out infinite 1.5s; }
.fc-5 { bottom: 10px; left: -70px; animation: floatCard 4s ease-in-out infinite 0.8s; }
@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50%  { transform: translateY(-8px); }
}
.fc-icon { font-size: 1.4rem; }
.fc-title { font-size: 0.72rem; font-weight: 700; color: var(--text-primary); }
.fc-sub   { font-size: 0.62rem; color: var(--text-muted); }

/* Scroll down */
.scroll-down {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  z-index: 1;
  animation: scrollBounce 2s ease-in-out infinite;
}
.scroll-icon {
  width: 28px; height: 44px;
  border: 2px solid var(--border);
  border-radius: var(--radius-full);
  display: flex;
  justify-content: center;
  padding-top: 6px;
}
.scroll-wheel {
  width: 4px; height: 8px;
  background: var(--accent-green);
  border-radius: var(--radius-full);
  animation: scrollWheel 2s ease-in-out infinite;
}
@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%  { transform: translateX(-50%) translateY(8px); }
}
@keyframes scrollWheel {
  0%   { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(12px); }
}

/* ══════════════════════════════════════════════════════════════════
   SECTION SHARED STYLES
══════════════════════════════════════════════════════════════════ */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: var(--bg-icon);
  border: 1px solid var(--border);
  color: var(--accent-green);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ══════════════════════════════════════════════════════════════════
   ABOUT SECTION
══════════════════════════════════════════════════════════════════ */
.about-section { background: var(--bg-secondary); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-para {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}
.about-highlights { margin: 24px 0 32px; }
.highlight-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.highlight-item i { color: var(--accent-green); font-size: 1rem; }

.about-cards-col {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.value-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: var(--transition);
}
.value-card:hover {
  border-color: var(--border);
  transform: translateX(4px);
  box-shadow: var(--shadow-card);
}
.vc-icon { font-size: 1.8rem; flex-shrink: 0; }
.vc-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.vc-desc  { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* ══════════════════════════════════════════════════════════════════
   SUBJECTS SECTION
══════════════════════════════════════════════════════════════════ */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.subject-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition-bounce);
  cursor: pointer;
}
.subject-card:hover, .subject-card:focus {
  border-color: var(--border);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  outline: none;
}
.subject-card:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 4px; }

.subject-card-inner { padding: 28px 24px; }
.subject-icon { font-size: 2.2rem; margin-bottom: 14px; }
.subject-name { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }
.subject-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }
.subject-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.subject-topics span {
  padding: 4px 10px;
  background: var(--bg-icon);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  color: var(--accent-green);
  font-weight: 500;
}

/* ══════════════════════════════════════════════════════════════════
   CLASSIFICATION SECTION
══════════════════════════════════════════════════════════════════ */
.classification-section { background: var(--bg-secondary); }

/* Taxonomy Tree */
.taxonomy-tree {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px;
  margin-bottom: 48px;
}
.taxon-root { text-align: center; margin-bottom: 32px; }
.taxon-node {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-icon);
}
.root-node {
  background: var(--bg-icon);
  border-color: var(--border-glow);
  box-shadow: 0 0 20px rgba(16,185,129,0.15);
}
.taxon-icon { font-size: 1.6rem; }
.taxon-label { font-size: 0.85rem; font-weight: 700; color: var(--text-primary); }
.taxon-sub { font-size: 0.7rem; color: var(--text-muted); }

.taxon-branches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.taxon-branch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.branch-node { width: 100%; }
.featured-branch {
  border-color: var(--accent-green);
  box-shadow: 0 0 20px rgba(16,185,129,0.12);
}
.taxon-leaves {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}
.taxon-leaf {
  padding: 6px 14px;
  background: var(--bg-icon-neutral);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  color: var(--text-secondary);
  transition: var(--transition);
}
.taxon-leaf:hover {
  background: var(--bg-icon);
  border-color: var(--border);
  color: var(--accent-green);
}

/* Phyla Grid */
.phyla-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 20px;
}
.phyla-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  transition: var(--transition-bounce);
  cursor: pointer;
}
.phyla-card:hover, .phyla-card:focus {
  border-color: var(--border);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  outline: none;
}
.phyla-card:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 4px; }
.featured-phyla {
  background: var(--bg-icon);
  border-color: var(--border);
}
.phyla-icon { font-size: 2rem; margin-bottom: 10px; }
.phyla-card h3 { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.phyla-card p  { font-size: 0.78rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 12px; }
.phyla-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--bg-icon);
  color: var(--accent-teal);
  font-size: 0.68rem;
  font-weight: 600;
  border: 1px solid var(--border);
}
.featured-tag { color: var(--accent-green); }

/* ══════════════════════════════════════════════════════════════════
   PHYSIOLOGY SECTION
══════════════════════════════════════════════════════════════════ */
.physiology-section { background: var(--bg-primary); }

.physiology-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.physio-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition-bounce);
  cursor: pointer;
}
.physio-card:hover, .physio-card:focus {
  border-color: var(--border);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  outline: none;
}
.physio-card:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 4px; }
.physio-icon { font-size: 2rem; margin-bottom: 12px; }
.physio-card h3 { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.physio-card p  { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }
.physio-flow {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.physio-flow span {
  padding: 4px 10px;
  background: var(--bg-icon);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  color: var(--accent-teal);
  font-weight: 600;
}
.physio-flow i { color: var(--text-muted); font-size: 0.7rem; }

/* ══════════════════════════════════════════════════════════════════
   ECOLOGY SECTION
══════════════════════════════════════════════════════════════════ */
.ecology-section { background: var(--bg-secondary); }

.ecology-layout {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 60px;
  align-items: start;
}

/* Food Chain */
.food-chain-visual {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px;
}
.fc-title-label {
  text-align: center;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-green);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.food-chain {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.fc-level {
  width: 100%;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--border-subtle);
  transition: var(--transition);
}
.fc-level:hover { border-color: var(--border); transform: translateX(4px); }

.fc-level.sun        { background: rgba(250,204,21,0.08);  border-color: rgba(250,204,21,0.15); }
.fc-level.producers  { background: rgba(132,204,22,0.08);  border-color: rgba(132,204,22,0.15); }
.fc-level.primary    { background: rgba(16,185,129,0.08);  border-color: rgba(16,185,129,0.15); }
.fc-level.secondary  { background: rgba(6,182,212,0.08);   border-color: rgba(6,182,212,0.15); }
.fc-level.top        { background: rgba(239,68,68,0.08);   border-color: rgba(239,68,68,0.15); }
.fc-level.decomposers{ background: rgba(139,92,246,0.08);  border-color: rgba(139,92,246,0.15); }

.fc-emoji   { font-size: 1.4rem; }
.fc-lname   { font-size: 0.82rem; font-weight: 700; color: var(--text-primary); }
.fc-lsub    { font-size: 0.7rem; color: var(--text-muted); }
.fc-arrow   { text-align: center; color: var(--text-muted); font-size: 0.8rem; }

/* Ecology topics */
.ecology-topics { display: flex; flex-direction: column; gap: 16px; }
.eco-topic-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: var(--transition);
  cursor: pointer;
}
.eco-topic-card:hover, .eco-topic-card:focus {
  border-color: var(--border);
  transform: translateX(6px);
  box-shadow: var(--shadow-card);
  outline: none;
}
.eco-topic-card:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 4px; }
.eco-icon { font-size: 1.6rem; flex-shrink: 0; }
.eco-info h3 { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.eco-info p  { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }

/* ══════════════════════════════════════════════════════════════════
   QUIZ SECTION
══════════════════════════════════════════════════════════════════ */
.quiz-section { background: var(--bg-primary); }

.quiz-layout {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 60px;
  align-items: start;
}

/* Quiz UI */
.quiz-card-ui {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px;
}
.quiz-header-ui {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.quiz-topic-tag {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--bg-icon);
  color: var(--accent-green);
  font-size: 0.72rem;
  font-weight: 700;
  border: 1px solid var(--border);
}
.quiz-progress-text { font-size: 0.78rem; color: var(--text-muted); }
.quiz-progress-text strong { color: var(--text-primary); }
.quiz-progress-bar-wrap {
  height: 4px;
  background: var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 20px;
}
.quiz-progress-bar-fill {
  height: 100%;
  background: var(--grad-primary);
  border-radius: var(--radius-full);
  transition: width 0.6s ease;
}
.quiz-question-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 20px;
}
.quiz-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.quiz-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-subtle);
  background: var(--bg-icon-neutral);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.quiz-option:hover, .quiz-option:focus {
  border-color: var(--border);
  color: var(--text-primary);
  background: var(--bg-card);
  outline: none;
}
.quiz-option:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 2px; }
.quiz-option.correct {
  border-color: var(--accent-green);
  background: rgba(16,185,129,0.10);
  color: var(--text-primary);
}
.quiz-option.correct i { color: var(--accent-green); margin-left: auto; }
.opt-letter {
  width: 28px; height: 28px;
  border-radius: var(--radius-sm);
  background: var(--bg-icon);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-green);
  flex-shrink: 0;
}
.quiz-option.correct .opt-letter {
  background: var(--accent-green);
  color: #fff;
}
.quiz-explanation {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: var(--bg-icon);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  margin-bottom: 20px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.quiz-explanation i { color: var(--accent-green); margin-top: 2px; flex-shrink: 0; }
.quiz-actions { text-align: right; }
.btn-quiz-next {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  background: var(--grad-primary);
  color: var(--text-on-accent);
  font-weight: 700;
  font-size: 0.85rem;
  transition: var(--transition-bounce);
  cursor: pointer;
}
.btn-quiz-next:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16,185,129,0.30);
}

/* Quiz features */
.quiz-feat-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 20px; color: var(--text-primary); }
.quiz-feat-list  { display: flex; flex-direction: column; gap: 14px; margin-bottom: 28px; }
.quiz-feat-item  {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.qf-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-icon);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent-green);
  flex-shrink: 0;
}
.qf-info strong { display: block; font-size: 0.88rem; color: var(--text-primary); margin-bottom: 2px; }
.qf-info span   { font-size: 0.78rem; color: var(--text-secondary); }

/* Score preview */
.quiz-score-preview {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.score-circle { position: relative; width: 80px; height: 80px; flex-shrink: 0; }
.score-circle svg { width: 100%; height: 100%; }
.score-val {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1rem;
  font-weight: 800;
  color: var(--accent-green);
}
.score-details { display: flex; flex-direction: column; gap: 8px; }
.score-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.sr-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
}
.correct-dot { background: var(--accent-green); }
.wrong-dot   { background: #ef4444; }
.score-row i { color: #f59e0b; }

/* ══════════════════════════════════════════════════════════════════
   AUDIENCE SECTION
══════════════════════════════════════════════════════════════════ */
.audience-section { background: var(--bg-secondary); }

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.audience-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition-bounce);
  cursor: pointer;
}
.audience-card:hover, .audience-card:focus {
  border-color: var(--border);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  outline: none;
}
.audience-card:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 4px; }
.audience-icon { font-size: 2.4rem; margin-bottom: 14px; }
.audience-card h3 { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 14px; }
.audience-list { text-align: left; display: flex; flex-direction: column; gap: 8px; }
.audience-list li {
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding-left: 14px;
  position: relative;
}
.audience-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent-green);
  font-weight: 700;
}

/* ══════════════════════════════════════════════════════════════════
   FEATURES SECTION
══════════════════════════════════════════════════════════════════ */
.features-section { background: var(--bg-primary); }

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: var(--transition-bounce);
  cursor: pointer;
}
.feature-card:hover, .feature-card:focus {
  border-color: var(--border);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  outline: none;
}
.feature-card:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 4px; }
.feat-icon-wrap {
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  background: var(--bg-icon);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}
.feat-title { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.feat-desc  { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }

/* ══════════════════════════════════════════════════════════════════
   PROGRESS SECTION
══════════════════════════════════════════════════════════════════ */
.progress-section { background: var(--bg-secondary); }

.progress-dashboard {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.prog-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  min-width: 160px;
  flex: 1;
  transition: var(--transition-bounce);
  cursor: pointer;
}
.prog-stat-card:hover, .prog-stat-card:focus {
  border-color: var(--border);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  outline: none;
}
.prog-stat-card:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 4px; }
.prog-ring-wrap { position: relative; width: 80px; height: 80px; margin: 0 auto 12px; }
.prog-ring { width: 100%; height: 100%; }
.prog-val {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-primary);
}
.prog-number-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 12px;
}
.prog-big  { font-size: 2.2rem; font-weight: 900; color: var(--text-primary); line-height: 1; }
.prog-unit { font-size: 0.75rem; color: var(--text-muted); font-weight: 600; }
.prog-label { font-size: 0.8rem; color: var(--text-secondary); }

/* ══════════════════════════════════════════════════════════════════
   JOURNEY SECTION
══════════════════════════════════════════════════════════════════ */
.journey-section { background: var(--bg-primary); }

.journey-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}
.journey-step {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition-bounce);
  position: relative;
  cursor: pointer;
}
.journey-step:hover, .journey-step:focus {
  border-color: var(--border);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
  outline: none;
}
.journey-step:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 4px; }
.step-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--border-subtle);
  line-height: 1;
  margin-bottom: 8px;
}
.step-icon  { font-size: 2rem; margin-bottom: 12px; }
.step-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.step-desc  { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }
.step-connector {
  position: absolute;
  right: -13px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 2px;
  background: var(--border);
  z-index: 1;
}
.journey-step:last-child .step-connector { display: none; }

/* ══════════════════════════════════════════════════════════════════
   STATS SECTION
══════════════════════════════════════════════════════════════════ */
.stats-section {
  background: var(--grad-stats);
  padding: 80px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-card-big {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  text-align: center;
  transition: var(--transition-bounce);
  cursor: pointer;
}
.stat-card-big:hover, .stat-card-big:focus {
  border-color: var(--border-glow);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  outline: none;
}
.stat-card-big:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 4px; }
.stat-icon-big { font-size: 2.2rem; margin-bottom: 12px; }
.stat-num-big  { font-size: 2.8rem; font-weight: 900; color: var(--accent-green); display: inline; }
.stat-suffix   { font-size: 2rem; font-weight: 700; color: var(--accent-teal); }
.stat-lbl-big  { font-size: 0.85rem; color: var(--text-secondary); margin-top: 8px; }

/* ══════════════════════════════════════════════════════════════════
   THEME SHOWCASE SECTION
══════════════════════════════════════════════════════════════════ */
.theme-section { background: var(--bg-secondary); }

.theme-showcase { display: flex; flex-direction: column; align-items: center; gap: 24px; }
.theme-toggle-row { display: flex; gap: 12px; }
.theme-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.theme-pill:hover { border-color: var(--border); color: var(--text-primary); }
.theme-pill.active {
  background: var(--bg-icon);
  border-color: var(--border);
  color: var(--accent-green);
}

.theme-preview {
  width: 100%;
  max-width: 800px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
  transition: opacity 0.3s ease;
}
.theme-preview.hidden { display: none; }

/* Header bar (the traffic-light row) */
.tp-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--tp-header-bg);
  border-bottom: 1px solid var(--tp-header-border);
}
.tp-dot { width: 12px; height: 12px; border-radius: 50%; }
.tp-dot.red    { background: #ef4444; }
.tp-dot.yellow { background: #f59e0b; }
.tp-dot.green  { background: #10b981; }
.tp-title { font-size: 0.78rem; color: var(--tp-title-color); margin-left: 8px; }

/* Content area */
.tp-content {
  display: flex;
  min-height: 260px;
  background: var(--tp-bg);
}

/* Sidebar */
.tp-sidebar {
  width: 140px;
  flex-shrink: 0;
  padding: 16px;
  background: var(--tp-sidebar-bg);
  border-right: 1px solid var(--tp-sidebar-border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.tp-nav-item {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--tp-nav-color);
  transition: var(--transition);
}
.active-nav {
  background: rgba(16,185,129,0.12);
  color: var(--accent-green);
}

/* Main content */
.tp-main {
  flex: 1;
  padding: 20px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-content: flex-start;
}
.tp-card {
  background: var(--tp-card-bg);
  border: 1px solid var(--tp-card-border);
  border-radius: var(--radius-md);
  padding: 16px;
  min-width: 180px;
  flex: 1;
}
.tp-card-tag {
  font-size: 0.62rem;
  color: var(--accent-teal);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.tp-card-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--tp-card-title);
  margin-bottom: 4px;
}
.tp-card-sub {
  font-size: 0.72rem;
  color: var(--tp-card-sub);
  margin-bottom: 10px;
}
.tp-badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(16,185,129,0.12);
  color: var(--accent-green);
  font-size: 0.65rem;
  font-weight: 600;
}

/* ── Legacy class aliases kept for HTML compatibility ─────────── */
/* Dark variants — no-ops since tokens already handle it */
.dark-content  { /* uses var(--tp-bg) via .tp-content */ }
.light-content { /* uses var(--tp-bg) via .tp-content */ }
.dark-card     { /* uses var(--tp-card-*) via .tp-card */ }
.light-card    { /* uses var(--tp-card-*) via .tp-card */ }
.light-header  { /* uses var(--tp-header-*) via .tp-header */ }
.light-sidebar { /* uses var(--tp-sidebar-*) via .tp-sidebar */ }
.light-nav     { /* uses var(--tp-nav-color) via .tp-nav-item */ }
.light-tag     { color: var(--accent-teal); }
.light-text    { color: var(--tp-card-title); }
.light-sub     { color: var(--tp-card-sub); }
.light-badge   { background: rgba(16,185,129,0.10); color: var(--accent-green); }
.light-title   { color: var(--tp-title-color); }

/* ══════════════════════════════════════════════════════════════════
   OFFLINE SECTION
══════════════════════════════════════════════════════════════════ */
.offline-section { background: var(--bg-primary); padding: 60px 0; }

.offline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 48px;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}
.offline-icon  { font-size: 3rem; margin-bottom: 16px; }
.offline-title { font-size: 1.8rem; font-weight: 800; color: var(--text-primary); margin-bottom: 12px; }
.offline-desc  { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; max-width: 520px; margin: 0 auto 28px; }
.offline-features {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.of-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--bg-icon);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.of-item i { color: var(--accent-green); }

/* ══════════════════════════════════════════════════════════════════
   DOWNLOAD SECTION
══════════════════════════════════════════════════════════════════ */
.download-section {
  position: relative;
  overflow: hidden;
  background: var(--grad-download);
  padding: 120px 0;
}
.download-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.dl-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
}
.dl-b1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(16,185,129,0.15), transparent);
  top: -150px; right: -100px;
}
.dl-b2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(6,182,212,0.12), transparent);
  bottom: -100px; left: -80px;
}
.dl-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(16,185,129,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16,185,129,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

.download-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.dl-eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--bg-icon);
  border: 1px solid var(--border);
  color: var(--accent-green);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.download-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.download-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 32px;
}
.download-cta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }

.btn-download-big {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  border-radius: var(--radius-lg);
  background: var(--grad-primary);
  color: var(--text-on-accent);
  font-weight: 700;
  transition: var(--transition-bounce);
  box-shadow: var(--shadow-download);
}
.btn-download-big:hover {
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 20px 60px rgba(16,185,129,0.40);
}
.btn-dl-icon { font-size: 1.8rem; }
.btn-dl-sub  { display: block; font-size: 0.65rem; letter-spacing: 0.08em; opacity: 0.85; }
.btn-dl-main { display: block; font-size: 1.1rem; font-weight: 800; }

.btn-secondary-dl {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 24px;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  background: var(--bg-card);
  transition: var(--transition);
}
.btn-secondary-dl:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
  transform: translateY(-2px);
}
.download-tagline { font-size: 0.85rem; color: var(--text-muted); }

/* Download phone */
.download-visual { display: flex; justify-content: center; }
.dl-phone-wrap { position: relative; width: 240px; }
.dl-phone-glow {
  position: absolute;
  inset: -30px;
  background: radial-gradient(ellipse, rgba(16,185,129,0.20), transparent 70%);
  animation: glowPulse 3s ease-in-out infinite;
}
.dl-phone {
  width: 220px;
  background: var(--bg-card-solid);
  border-radius: 40px;
  padding: 12px;
  border: 2px solid var(--border);
  box-shadow: var(--shadow-phone);
  position: relative;
  z-index: 1;
  margin: 0 auto;
}
.dl-notch {
  width: 60px; height: 16px;
  background: var(--bg-primary);
  border-radius: 0 0 10px 10px;
  margin: 0 auto 8px;
}
.dl-screen { border-radius: 24px; overflow: hidden; background: var(--bg-dl-screen); padding: 16px; }
.dl-app { display: flex; flex-direction: column; gap: 12px; }
.dl-app-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-green);
}
.dl-app-hero { text-align: center; padding: 12px 0; }
.dl-animal-emojis {
  font-size: 1.2rem;
  letter-spacing: 2px;
  margin-bottom: 8px;
}
.dl-tagline-mini {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 600;
}
.dl-app-stats { display: flex; gap: 8px; justify-content: center; }
.dl-stat { text-align: center; }
.dl-sval { display: block; font-size: 0.7rem; font-weight: 800; color: var(--accent-green); }
.dl-slbl { display: block; font-size: 0.55rem; color: var(--text-muted); }
.dl-cta-mini {
  text-align: center;
  background: var(--grad-primary);
  color: var(--text-on-accent);
  padding: 8px;
  border-radius: var(--radius-full);
  font-size: 0.68rem;
  font-weight: 700;
}

/* ══════════════════════════════════════════════════════════════════
   FOOTER
══════════════════════════════════════════════════════════════════ */
.footer {
  background: var(--bg-footer);
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 32px;
  position: relative;
}
.footer-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--bg-icon), transparent);
  pointer-events: none;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
  position: relative;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.footer-logo-icon { font-size: 1.4rem; }
.footer-tagline {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}
.footer-gplay {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  background: var(--bg-icon);
  border: 1px solid var(--border);
  transition: var(--transition);
  margin-bottom: 16px;
}
.footer-gplay:hover { border-color: var(--accent-green); background: var(--bg-card); }
.footer-gplay i { font-size: 1.3rem; color: var(--accent-green); }
.fp-sub  { display: block; font-size: 0.58rem; color: var(--text-muted); letter-spacing: 0.06em; }
.fp-main { display: block; font-size: 0.82rem; font-weight: 700; color: var(--text-primary); }
.footer-by { font-size: 0.8rem; color: var(--text-muted); display: flex; align-items: center; gap: 6px; }
.footer-by strong { color: var(--accent-green); }

.footer-col-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--accent-green); transform: translateX(4px); display: inline-block; }

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  position: relative;
}
.footer-copy { font-size: 0.8rem; color: var(--text-muted); }
.footer-note { font-size: 0.75rem; color: var(--text-muted); max-width: 500px; text-align: right; }

/* ══════════════════════════════════════════════════════════════════
   LIGHT THEME OVERRIDES — component-specific fixes
══════════════════════════════════════════════════════════════════ */

/* Stat label in hero needs readable color */
[data-theme="light"] .stat-lbl { color: var(--text-muted); }
[data-theme="light"] .trust-sep { color: var(--border-subtle); }

/* Phone mockup inner elements */
[data-theme="light"] .phone-notch { background: var(--bg-secondary); }
[data-theme="light"] .app-topic-item { background: var(--bg-icon-neutral); }
[data-theme="light"] .app-nav-item span { color: var(--accent-green); }
[data-theme="light"] .quick-btn { background: var(--bg-icon); }
[data-theme="light"] .app-icon-btn { background: var(--bg-icon); }

/* Food chain level rows — keep colored tints but ensure text stays readable */
[data-theme="light"] .fc-level.sun        { background: rgba(234,179,8,0.10);   border-color: rgba(234,179,8,0.20); }
[data-theme="light"] .fc-level.producers  { background: rgba(101,163,13,0.10);  border-color: rgba(101,163,13,0.20); }
[data-theme="light"] .fc-level.primary    { background: rgba(5,150,105,0.10);   border-color: rgba(5,150,105,0.20); }
[data-theme="light"] .fc-level.secondary  { background: rgba(8,145,178,0.10);   border-color: rgba(8,145,178,0.20); }
[data-theme="light"] .fc-level.top        { background: rgba(220,38,38,0.08);   border-color: rgba(220,38,38,0.18); }
[data-theme="light"] .fc-level.decomposers{ background: rgba(124,58,237,0.08);  border-color: rgba(124,58,237,0.18); }
[data-theme="light"] .fc-lname { color: var(--text-primary); }
[data-theme="light"] .fc-lsub  { color: var(--text-muted); }

/* Quiz correct/wrong options */
[data-theme="light"] .quiz-option.correct {
  background: rgba(5,150,105,0.10);
  border-color: var(--accent-green);
}
[data-theme="light"] .quiz-option:not(.correct):not(.wrong-selected) {
  background: var(--bg-icon-neutral);
  color: var(--text-secondary);
}

/* Score dots */
[data-theme="light"] .correct-dot { background: var(--accent-green); }
[data-theme="light"] .wrong-dot   { background: #dc2626; }

/* Download section text */
[data-theme="light"] .download-title  { color: var(--text-primary); }
[data-theme="light"] .download-desc   { color: var(--text-secondary); }
[data-theme="light"] .download-tagline{ color: var(--text-muted); }
[data-theme="light"] .dl-app-header   { color: var(--accent-green); }
[data-theme="light"] .dl-tagline-mini { color: var(--text-muted); }
[data-theme="light"] .dl-slbl         { color: var(--text-muted); }
[data-theme="light"] .dl-phone-glow   { background: radial-gradient(ellipse, rgba(5,150,105,0.15), transparent 70%); }

/* Footer text */
[data-theme="light"] .footer-tagline  { color: var(--text-muted); }
[data-theme="light"] .footer-copy     { color: var(--text-muted); }
[data-theme="light"] .footer-note     { color: var(--text-muted); }
[data-theme="light"] .footer-links a  { color: var(--text-muted); }
[data-theme="light"] .fp-sub          { color: var(--text-muted); }
[data-theme="light"] .footer-by       { color: var(--text-muted); }

/* Step number in journey section */
[data-theme="light"] .step-number { color: rgba(0,0,0,0.12); }

/* Taxonomy */
[data-theme="light"] .taxon-leaf { color: var(--text-secondary); }
[data-theme="light"] .taxon-sub  { color: var(--text-muted); }

/* Section backgrounds stay themed */
[data-theme="light"] .hero-grid {
  background-image:
    linear-gradient(rgba(5,150,105,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(5,150,105,0.05) 1px, transparent 1px);
}

/* ══════════════════════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════════════════════ */
@media (max-width: 1100px) {
  .hero-container { grid-template-columns: 1fr; gap: 60px; text-align: center; padding-top: 100px; }
  .hero-cta, .hero-trust, .hero-stats { justify-content: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-visual { justify-content: center; }
  .fc-1, .fc-3, .fc-5 { left: -40px; }
  .fc-2, .fc-4 { right: -40px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .journey-steps { grid-template-columns: 1fr 1fr; }
  .step-connector { display: none; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .ecology-layout { grid-template-columns: 1fr; gap: 40px; }
  .quiz-layout    { grid-template-columns: 1fr; gap: 40px; }
  .download-layout { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .download-cta { justify-content: center; }
  .taxon-branches { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    padding: 16px;
    border-bottom: 1px solid var(--border-subtle);
    gap: 4px;
    z-index: 999;
  }
  .nav-link { padding: 10px 16px; border-radius: var(--radius-md); }
}

@media (max-width: 640px) {
  .section { padding: 72px 0; }
  .section-header { margin-bottom: 40px; }
  .hero-container { padding: 80px 24px 60px; }
  .hero-heading { font-size: 2.2rem; }
  .subjects-grid { grid-template-columns: 1fr; }
  .phyla-grid { grid-template-columns: 1fr 1fr; }
  .physiology-grid { grid-template-columns: 1fr; }
  .audience-grid { grid-template-columns: 1fr 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .journey-steps { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .progress-dashboard { flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-note { text-align: left; }
  .phone-mockup-wrapper { width: 260px; }
  .phone-mockup { width: 240px; }
  .fc-1, .fc-2, .fc-3, .fc-4, .fc-5 { display: none; }
  .taxonomy-tree { padding: 24px 16px; }
  .offline-card { padding: 32px 20px; }
}