/* =============================================================
   CrossPet Reader — Modern Retro Elegant Design System
   Typography: Be Vietnam Pro (body/headings) + Press Start 2P (accents) + JetBrains Mono (code)
   ============================================================= */

@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Press+Start+2P&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Custom Properties (Light Mode) ── */
:root {
  --bg-primary:    #fafaf8;
  --bg-secondary:  #f0efed;
  --bg-card:       #ffffff;
  --bg-nav:        rgba(250,250,248,0.92);
  --text-primary:  #1a1a1a;
  --text-secondary:#4a4a4a;
  --text-muted:    #8a8a8a;
  --accent:        #e85d3a;
  --accent-hover:  #d14b2a;
  --accent-green:  #34a853;
  --accent-blue:   #4285f4;
  --accent-purple: #9b59b6;
  --border:        #e0e0de;
  --border-light:  #eeeeec;
  --pixel-accent:  #e85d3a;
  --code-bg:       #f4f4f2;
  --table-header:  #f4f4f2;
  --check-color:   #34a853;
  --cross-color:   #c0c0bc;
  --shadow-sm:     0 1px 3px rgba(0,0,0,0.06);
  --shadow-md:     0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg:     0 8px 24px rgba(0,0,0,0.12);

  --font-heading: 'Be Vietnam Pro', system-ui, sans-serif;
  --font-body:    'Be Vietnam Pro', system-ui, sans-serif;
  --font-pixel:   'Press Start 2P', monospace;
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;

  --max-width: 780px;
  --nav-height: 60px;
  --transition: 0.2s ease;
  --radius: 8px;
  --radius-lg: 12px;
}

/* ── Dark Mode ── */
[data-theme="dark"] {
  --bg-primary:    #141416;
  --bg-secondary:  #1e1e22;
  --bg-card:       #242428;
  --bg-nav:        rgba(20,20,22,0.92);
  --text-primary:  #f0f0ec;
  --text-secondary:#b0b0a8;
  --text-muted:    #6a6a64;
  --accent:        #ff7a5c;
  --accent-hover:  #ff6347;
  --accent-green:  #4ecf6d;
  --accent-blue:   #6ea8fe;
  --accent-purple: #b377d9;
  --border:        #2e2e32;
  --border-light:  #262628;
  --pixel-accent:  #ff7a5c;
  --code-bg:       #1e1e22;
  --table-header:  #1e1e22;
  --check-color:   #4ecf6d;
  --cross-color:   #3a3a40;
  --shadow-sm:     0 1px 3px rgba(0,0,0,0.2);
  --shadow-md:     0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg:     0 8px 24px rgba(0,0,0,0.4);
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

/* ── Skip to Content ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius);
  z-index: 1000;
  transition: top var(--transition);
}
.skip-link:focus { top: 1rem; }

/* ── Typography ── */
h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: 1.3;
  font-weight: 700;
}
h1 { font-size: clamp(1.7rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.25rem, 3vw, 1.6rem); }
h3 { font-size: 1.05rem; font-weight: 600; }
h4 { font-size: 0.9rem; font-weight: 600; }

p { margin-bottom: 1em; color: var(--text-secondary); font-size: 0.95rem; }
a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--accent-hover); }

code, pre {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-bg);
}
code { padding: 0.15em 0.45em; border-radius: 4px; border: 1px solid var(--border); }
pre {
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  margin: 1.5rem 0;
  line-height: 1.6;
  box-shadow: var(--shadow-sm);
}

/* ── Layout ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

section { padding: 4rem 0; }

/* ── Section Dividers ── */
.section-divider {
  border: none;
  height: 1px;
  background: var(--border);
  opacity: 0.6;
  margin: 0;
}

/* ── Navigation ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
  letter-spacing: -0.01em;
}
.nav-logo:hover { color: var(--accent); }
.nav-logo .pet-icon { font-size: 1.15rem; line-height: 1; }

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

/* Nav controls */
.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.dark-mode-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1rem;
  width: 34px;
  height: 34px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.dark-mode-toggle:hover {
  background: var(--bg-secondary);
  border-color: var(--border);
  color: var(--text-primary);
}
.dark-mode-toggle .icon-moon { display: none; }
[data-theme="dark"] .dark-mode-toggle .icon-sun  { display: none; }
[data-theme="dark"] .dark-mode-toggle .icon-moon { display: inline; }

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 2px;
}
.lang-btn {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 3px 8px;
  border-radius: 5px;
  transition: all var(--transition);
  line-height: 1;
}
.lang-btn.active,
.lang-btn:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}
.lang-sep { display: none; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
}
.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-hamburger:hover span { background: var(--text-primary); }

/* Mobile nav */
@media (max-width: 767px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    padding: 0.5rem;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
  }
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 11px 24px;
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text-primary);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: -0.01em;
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-large { padding: 13px 28px; font-size: 0.95rem; }

/* ── Fork Badge ── */
.fork-badge {
  display: inline-block;
  margin-top: 1.25rem;
  margin-bottom: 0.25rem;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--accent-purple);
  color: #fff;
  border-radius: 20px;
  letter-spacing: 0.03em;
  line-height: 1.8;
  opacity: 0.9;
}

/* ── Hero ── */
.hero {
  padding: 5rem 0 4.5rem;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}
.hero h1 { margin-bottom: 0.5rem; letter-spacing: -0.02em; }
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 2rem;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.hero-specs {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
/* hero-specs renders as a single string in HTML — style as a subtle pill */
.hero-specs {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  background: var(--bg-secondary);
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* ── Pixel Pet (CSS box-shadow art — kept as-is) ── */
.pixel-pet-wrapper {
  position: absolute;
  right: 2.5rem;
  bottom: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  pointer-events: none;
  user-select: none;
}

@media (max-width: 640px) {
  .pixel-pet-wrapper { display: none; }
}

.pixel-pet-container {
  position: relative;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 16×16 pixel chicken using box-shadow, 1px element scaled 4× */
.pixel-pet {
  position: relative;
  width: 1px;
  height: 1px;
  transform: scale(4);
  transform-origin: center;
  image-rendering: pixelated;
}

/* Chicken sprite — standing with comb and tail feathers */
.pixel-pet::before {
  content: '';
  position: absolute;
  width: 1px;
  height: 1px;
  top: 0;
  left: 0;
  box-shadow:
    /* comb (red) */
    6px 0px 0 0 #e53935,
    7px 0px 0 0 #e53935,
    8px 0px 0 0 #e53935,
    5px 1px 0 0 #e53935,
    6px 1px 0 0 #e53935,
    7px 1px 0 0 #e53935,
    8px 1px 0 0 #e53935,
    9px 1px 0 0 #e53935,
    /* head */
    5px 2px 0 0 var(--text-primary),
    6px 2px 0 0 var(--text-primary),
    7px 2px 0 0 var(--text-primary),
    8px 2px 0 0 var(--text-primary),
    9px 2px 0 0 var(--text-primary),
    4px 3px 0 0 var(--text-primary),
    5px 3px 0 0 #fff,
    6px 3px 0 0 #fff,
    7px 3px 0 0 #fff,
    8px 3px 0 0 #fff,
    9px 3px 0 0 #fff,
    10px 3px 0 0 var(--text-primary),
    /* eye row */
    4px 4px 0 0 var(--text-primary),
    5px 4px 0 0 #fff,
    6px 4px 0 0 var(--text-primary),
    7px 4px 0 0 #fff,
    8px 4px 0 0 #fff,
    9px 4px 0 0 #fff,
    10px 4px 0 0 var(--text-primary),
    /* beak row */
    4px 5px 0 0 var(--text-primary),
    5px 5px 0 0 #fff,
    6px 5px 0 0 #fff,
    7px 5px 0 0 #fff,
    8px 5px 0 0 #fff,
    9px 5px 0 0 #fff,
    10px 5px 0 0 var(--text-primary),
    11px 5px 0 0 #f9a825,
    12px 5px 0 0 #f9a825,
    /* wattle + beak */
    5px 6px 0 0 var(--text-primary),
    6px 6px 0 0 #fff,
    7px 6px 0 0 #fff,
    8px 6px 0 0 #fff,
    9px 6px 0 0 var(--text-primary),
    10px 6px 0 0 #f9a825,
    11px 6px 0 0 #f9a825,
    7px 7px 0 0 #e53935,
    8px 7px 0 0 #e53935,
    /* body */
    3px 7px 0 0 var(--text-primary),
    4px 7px 0 0 var(--text-primary),
    5px 7px 0 0 var(--text-primary),
    6px 7px 0 0 #fff,
    9px 7px 0 0 var(--text-primary),
    2px 8px 0 0 var(--text-primary),
    3px 8px 0 0 #fff,
    4px 8px 0 0 #fff,
    5px 8px 0 0 #fff,
    6px 8px 0 0 #fff,
    7px 8px 0 0 #fff,
    8px 8px 0 0 #fff,
    9px 8px 0 0 var(--text-primary),
    /* wing */
    2px 9px 0 0 var(--text-primary),
    3px 9px 0 0 #fff,
    4px 9px 0 0 #fff,
    5px 9px 0 0 #ddd,
    6px 9px 0 0 #ddd,
    7px 9px 0 0 #fff,
    8px 9px 0 0 #fff,
    9px 9px 0 0 var(--text-primary),
    2px 10px 0 0 var(--text-primary),
    3px 10px 0 0 #fff,
    4px 10px 0 0 #ddd,
    5px 10px 0 0 #ccc,
    6px 10px 0 0 #ddd,
    7px 10px 0 0 #fff,
    8px 10px 0 0 #fff,
    9px 10px 0 0 var(--text-primary),
    /* lower body */
    3px 11px 0 0 var(--text-primary),
    4px 11px 0 0 #fff,
    5px 11px 0 0 #fff,
    6px 11px 0 0 #fff,
    7px 11px 0 0 #fff,
    8px 11px 0 0 var(--text-primary),
    /* tail feathers */
    1px 8px 0 0 var(--text-primary),
    0px 7px 0 0 var(--text-primary),
    0px 6px 0 0 #e53935,
    1px 6px 0 0 #e53935,
    1px 7px 0 0 #e87722,
    0px 8px 0 0 #e87722,
    0px 9px 0 0 #f9a825,
    1px 9px 0 0 #f9a825,
    /* legs */
    5px 12px 0 0 var(--text-primary),
    6px 12px 0 0 var(--text-primary),
    5px 13px 0 0 #f9a825,
    7px 13px 0 0 #f9a825,
    /* feet */
    4px 14px 0 0 #f9a825,
    5px 14px 0 0 #f9a825,
    6px 14px 0 0 #f9a825,
    7px 14px 0 0 #f9a825,
    8px 14px 0 0 #f9a825;
}

/* Idle pecking animation */
@keyframes pet-idle {
  0%, 80%, 100% { transform: scale(4) translateY(0px); }
  85%           { transform: scale(4) translateY(2px); }
  90%           { transform: scale(4) translateY(0px); }
}

/* Chicken blink animation on ::after */
.pixel-pet::after {
  content: '';
  position: absolute;
  width: 1px;
  height: 1px;
  box-shadow:
    6px 4px 0 0 var(--text-primary);
  opacity: 0;
  animation: pet-blink 4s infinite;
}

@keyframes pet-blink {
  0%, 88%, 100% { opacity: 0; }
  90%, 96%      { opacity: 1; }
}

.pixel-pet {
  animation: pet-idle 3s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .pixel-pet { animation: none; }
}

/* Speech bubble — clean, rounded */
.pet-speech {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 5px 10px;
  color: var(--text-muted);
  white-space: nowrap;
  border-radius: var(--radius);
  position: relative;
}
.pet-speech::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 10px;
  height: 10px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ── Use Cases ── */
.use-cases { background: var(--bg-secondary); }
.use-cases .section-title { text-align: center; margin-bottom: 0.5rem; }
.use-cases .section-lead { text-align: center; color: var(--text-muted); margin-bottom: 3rem; }

.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
@media (min-width: 600px) { .cards-grid { grid-template-columns: 1fr 1fr; } }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.card-icon { font-size: 2rem; margin-bottom: 0.85rem; display: block; }
.card h3 { margin-bottom: 0.5rem; }
.card p { margin-bottom: 0; font-size: 0.9rem; color: var(--text-muted); }

/* ── Features ── */
.features .section-title { margin-bottom: 0.5rem; }
.features .section-lead { color: var(--text-muted); margin-bottom: 3rem; }

.features-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 640px) { .features-split { grid-template-columns: 1fr 1fr; gap: 2rem; } }

.features-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.features-group h3 {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}
.features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.features-list li {
  padding-left: 1.4rem;
  position: relative;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.features-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-green);
  font-weight: 700;
  font-size: 0.85rem;
  top: 0.05em;
}

/* CrossPet Exclusives — accent left border + purple label */
.features-group.exclusive {
  border-color: var(--accent-purple);
  border-left: 3px solid var(--accent-purple);
  background: var(--bg-card);
}
.features-group.exclusive h3 {
  color: var(--accent-purple);
  border-color: var(--border);
}
.features-group.exclusive h3::after {
  content: 'EXCLUSIVE';
  display: inline-block;
  margin-left: 0.6rem;
  font-family: var(--font-pixel);
  font-size: 0.4rem;
  background: var(--accent-purple);
  color: #fff;
  padding: 2px 5px;
  border-radius: 3px;
  vertical-align: middle;
  letter-spacing: 0.05em;
}

/* ── Comparison Table ── */
.comparison { background: var(--bg-secondary); }
.comparison .section-title { margin-bottom: 2rem; }
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}
.comparison-table th, .comparison-table td {
  padding: 0.7rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.comparison-table th {
  background: var(--table-header);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}
.comparison-table tbody tr:last-child td { border-bottom: none; }
.comparison-table tbody tr { background: var(--bg-card); }
.comparison-table tbody tr:nth-child(even) { background: var(--bg-secondary); }
.comparison-table tr:hover td { background: var(--bg-primary); }
.check { color: var(--check-color); font-weight: 700; font-size: 1rem; }
.cross { color: var(--cross-color); font-size: 1rem; }

/* ── Device Comparison ── */
.device-comparison { background: var(--bg-primary); }
.device-comparison .section-title { margin-bottom: 0.5rem; }
.device-compare-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 1.5rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* ── Hardware Banner ── */
.hw-banner {
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 1.25rem 0;
}
.hw-banner-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.75rem;
  align-items: center;
  justify-content: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.hw-item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  opacity: 0.7;
}
.hw-item::before { content: '· '; opacity: 0.4; }
.hw-item:first-child::before { content: ''; }

/* ── Architecture Page ── */
.arch-specs-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 2rem;
  margin-bottom: 3rem;
}
.arch-specs-card h2 { margin-bottom: 1.5rem; }
.specs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}
@media (min-width: 500px) { .specs-grid { grid-template-columns: 1fr 1fr; } }
.spec-row { display: flex; flex-direction: column; gap: 0.15rem; }
.spec-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.spec-value { font-size: 0.95rem; color: var(--text-secondary); font-weight: 500; }

details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.5rem;
  background: var(--bg-card);
  overflow: hidden;
}
details[open] { border-color: var(--accent); }
summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
  user-select: none;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
summary:hover { background: var(--bg-secondary); }
summary::after { content: '+'; color: var(--accent); font-size: 1.1rem; font-weight: 400; }
details[open] summary::after { content: '−'; }
.details-body {
  padding: 0 1.25rem 1.25rem;
  border-top: 1px solid var(--border);
}
.details-body p:first-child { margin-top: 1rem; }

/* ── Flash Page ── */
.flash-hero { padding: 3.5rem 0 2rem; border-bottom: 1px solid var(--border); }
.flash-steps { counter-reset: step; margin: 3rem 0; }
.flash-step {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
  align-items: flex-start;
}
.step-num {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border: 2px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent);
  background: var(--bg-card);
}
.step-content h3 { font-size: 1rem; margin-bottom: 0.4rem; }
.step-content p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }

.flash-btn-area {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  margin: 2rem 0;
}
.flash-btn {
  display: inline-block;
  padding: 13px 28px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
}
.flash-btn:hover {
  background: var(--accent-hover);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.browser-warning {
  background: var(--bg-secondary);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  font-size: 0.9rem;
  color: var(--accent);
  margin: 1.5rem 0;
  display: none;
}
.browser-warning.visible { display: block; }

/* ── FAQ Page ── */
.limitations-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 2rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}
.limitations-table th, .limitations-table td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.limitations-table th {
  background: var(--table-header);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text-primary);
}
.limitations-table tbody tr { background: var(--bg-card); }
.limitations-table tbody tr:nth-child(even) { background: var(--bg-secondary); }
.limitations-table tr:hover td { background: var(--bg-primary); }
.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 3px 6px;
  border-radius: 3px;
  letter-spacing: 0.03em;
}
.badge-design { background: var(--bg-secondary); color: var(--text-muted); border: 1px solid var(--border); }
.badge-planned { background: rgba(52,168,83,0.12); color: var(--accent-green); border: 1px solid var(--accent-green); }
.badge-hw { background: rgba(66,133,244,0.12); color: var(--accent-blue); border: 1px solid var(--accent-blue); }

/* ── Footer ── */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 3rem 0 2rem;
  margin-top: 4rem;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
  margin-bottom: 2rem;
  list-style: none;
}
.footer-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.3rem 0.6rem;
  border-radius: 5px;
  transition: color var(--transition), background var(--transition);
}
.footer-links a:hover {
  color: var(--accent);
  background: var(--bg-card);
}
.footer-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.footer-note a { color: var(--text-muted); }
.footer-note a:hover { color: var(--accent); }
.footer-tagline {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 1.25rem;
  letter-spacing: 0.04em;
  opacity: 0.6;
}

/* ── Pet Evolution Section ── */
.pet-evolution { background: var(--bg-secondary); }
.pet-evolution .section-title { text-align: center; margin-bottom: 0.5rem; }
.pet-evolution .section-lead { text-align: center; }

.evo-timeline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin: 2.5rem 0 2rem;
  flex-wrap: wrap;
}

.evo-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  min-width: 110px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.evo-stage:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.evo-sprite {
  width: 64px;
  height: 64px;
  image-rendering: pixelated;
  position: relative;
}

/* Egg — simple oval with crack */
.evo-egg::before {
  content: '';
  position: absolute;
  width: 1px;
  height: 1px;
  transform: scale(4);
  transform-origin: top left;
  left: 16px;
  top: 8px;
  box-shadow:
    /* egg top */
    3px 0 0 0 var(--text-primary),
    4px 0 0 0 var(--text-primary),
    5px 0 0 0 var(--text-primary),
    2px 1px 0 0 var(--text-primary),
    3px 1px 0 0 #f5deb3,
    4px 1px 0 0 #f5deb3,
    5px 1px 0 0 #f5deb3,
    6px 1px 0 0 var(--text-primary),
    1px 2px 0 0 var(--text-primary),
    2px 2px 0 0 #f5deb3,
    3px 2px 0 0 #f5deb3,
    4px 2px 0 0 #f5deb3,
    5px 2px 0 0 #f5deb3,
    6px 2px 0 0 #f5deb3,
    7px 2px 0 0 var(--text-primary),
    1px 3px 0 0 var(--text-primary),
    2px 3px 0 0 #f5deb3,
    3px 3px 0 0 #f5deb3,
    4px 3px 0 0 #f5deb3,
    5px 3px 0 0 #f5deb3,
    6px 3px 0 0 #f5deb3,
    7px 3px 0 0 var(--text-primary),
    /* crack line */
    1px 4px 0 0 var(--text-primary),
    2px 4px 0 0 #f5deb3,
    3px 4px 0 0 var(--text-primary),
    4px 4px 0 0 #f5deb3,
    5px 4px 0 0 var(--text-primary),
    6px 4px 0 0 #f5deb3,
    7px 4px 0 0 var(--text-primary),
    1px 5px 0 0 var(--text-primary),
    2px 5px 0 0 #f5deb3,
    3px 5px 0 0 #f5deb3,
    4px 5px 0 0 #f5deb3,
    5px 5px 0 0 #f5deb3,
    6px 5px 0 0 #f5deb3,
    7px 5px 0 0 var(--text-primary),
    1px 6px 0 0 var(--text-primary),
    2px 6px 0 0 #f5deb3,
    3px 6px 0 0 #f5deb3,
    4px 6px 0 0 #f5deb3,
    5px 6px 0 0 #f5deb3,
    6px 6px 0 0 #f5deb3,
    7px 6px 0 0 var(--text-primary),
    2px 7px 0 0 var(--text-primary),
    3px 7px 0 0 var(--text-primary),
    4px 7px 0 0 var(--text-primary),
    5px 7px 0 0 var(--text-primary),
    6px 7px 0 0 var(--text-primary);
  animation: egg-wobble 2s ease-in-out infinite;
}
@keyframes egg-wobble {
  0%, 100% { transform: scale(4) rotate(0deg); }
  25% { transform: scale(4) rotate(-3deg); }
  75% { transform: scale(4) rotate(3deg); }
}

/* Baby — tiny chick, fluffy and yellow */
.evo-baby::before {
  content: '';
  position: absolute;
  width: 1px;
  height: 1px;
  transform: scale(4);
  transform-origin: top left;
  left: 16px;
  top: 12px;
  box-shadow:
    /* head */
    2px 0 0 0 var(--text-primary),
    3px 0 0 0 var(--text-primary),
    4px 0 0 0 var(--text-primary),
    5px 0 0 0 var(--text-primary),
    1px 1px 0 0 var(--text-primary),
    2px 1px 0 0 #ffd54f,
    3px 1px 0 0 #ffd54f,
    4px 1px 0 0 #ffd54f,
    5px 1px 0 0 #ffd54f,
    6px 1px 0 0 var(--text-primary),
    /* eye + beak */
    1px 2px 0 0 var(--text-primary),
    2px 2px 0 0 #ffd54f,
    3px 2px 0 0 var(--text-primary),
    4px 2px 0 0 #ffd54f,
    5px 2px 0 0 #ffd54f,
    6px 2px 0 0 var(--text-primary),
    7px 2px 0 0 #f9a825,
    /* body */
    1px 3px 0 0 var(--text-primary),
    2px 3px 0 0 #ffd54f,
    3px 3px 0 0 #ffd54f,
    4px 3px 0 0 #ffd54f,
    5px 3px 0 0 #ffd54f,
    6px 3px 0 0 var(--text-primary),
    2px 4px 0 0 var(--text-primary),
    3px 4px 0 0 #ffd54f,
    4px 4px 0 0 #ffd54f,
    5px 4px 0 0 var(--text-primary),
    /* feet */
    2px 5px 0 0 #f9a825,
    3px 5px 0 0 #f9a825,
    4px 5px 0 0 #f9a825,
    5px 5px 0 0 #f9a825;
  animation: baby-bounce 1.5s ease-in-out infinite;
}
@keyframes baby-bounce {
  0%, 100% { transform: scale(4) translateY(0); }
  50% { transform: scale(4) translateY(-3px); }
}

/* Teen — hen, white with small comb */
.evo-teen::before {
  content: '';
  position: absolute;
  width: 1px;
  height: 1px;
  transform: scale(4);
  transform-origin: top left;
  left: 10px;
  top: 4px;
  box-shadow:
    /* small comb */
    5px 0 0 0 #e53935,
    6px 0 0 0 #e53935,
    5px 1px 0 0 #e53935,
    /* head */
    4px 1px 0 0 var(--text-primary),
    5px 1px 0 0 var(--text-primary),
    6px 1px 0 0 var(--text-primary),
    7px 1px 0 0 var(--text-primary),
    3px 2px 0 0 var(--text-primary),
    4px 2px 0 0 #fff,
    5px 2px 0 0 #fff,
    6px 2px 0 0 #fff,
    7px 2px 0 0 #fff,
    8px 2px 0 0 var(--text-primary),
    /* eye + beak */
    3px 3px 0 0 var(--text-primary),
    4px 3px 0 0 #fff,
    5px 3px 0 0 var(--text-primary),
    6px 3px 0 0 #fff,
    7px 3px 0 0 #fff,
    8px 3px 0 0 var(--text-primary),
    9px 3px 0 0 #f9a825,
    /* lower head */
    3px 4px 0 0 var(--text-primary),
    4px 4px 0 0 #fff,
    5px 4px 0 0 #fff,
    6px 4px 0 0 #fff,
    7px 4px 0 0 var(--text-primary),
    /* wattle */
    6px 5px 0 0 #e53935,
    /* body */
    2px 5px 0 0 var(--text-primary),
    3px 5px 0 0 var(--text-primary),
    4px 5px 0 0 #fff,
    5px 5px 0 0 #fff,
    7px 5px 0 0 var(--text-primary),
    1px 6px 0 0 var(--text-primary),
    2px 6px 0 0 #fff,
    3px 6px 0 0 #fff,
    4px 6px 0 0 #fff,
    5px 6px 0 0 #fff,
    6px 6px 0 0 #fff,
    7px 6px 0 0 var(--text-primary),
    /* wing */
    1px 7px 0 0 var(--text-primary),
    2px 7px 0 0 #fff,
    3px 7px 0 0 #ddd,
    4px 7px 0 0 #ddd,
    5px 7px 0 0 #fff,
    6px 7px 0 0 #fff,
    7px 7px 0 0 var(--text-primary),
    2px 8px 0 0 var(--text-primary),
    3px 8px 0 0 #fff,
    4px 8px 0 0 #fff,
    5px 8px 0 0 #fff,
    6px 8px 0 0 var(--text-primary),
    /* tail (small) */
    0px 5px 0 0 #e87722,
    0px 6px 0 0 #e87722,
    /* legs */
    3px 9px 0 0 #f9a825,
    5px 9px 0 0 #f9a825,
    2px 10px 0 0 #f9a825,
    3px 10px 0 0 #f9a825,
    4px 10px 0 0 #f9a825,
    5px 10px 0 0 #f9a825,
    6px 10px 0 0 #f9a825;
  animation: teen-read 3s ease-in-out infinite;
}
@keyframes teen-read {
  0%, 100% { transform: scale(4) translateY(0); }
  50% { transform: scale(4) translateY(-1px); }
}

/* Adult — proud rooster with big comb, tail feathers, holding book */
.evo-adult::before {
  content: '';
  position: absolute;
  width: 1px;
  height: 1px;
  transform: scale(3);
  transform-origin: top left;
  left: 4px;
  top: 0px;
  box-shadow:
    /* big comb */
    7px 0 0 0 #e53935,
    8px 0 0 0 #e53935,
    9px 0 0 0 #e53935,
    10px 0 0 0 #e53935,
    6px 1px 0 0 #e53935,
    7px 1px 0 0 #e53935,
    8px 1px 0 0 #e53935,
    9px 1px 0 0 #e53935,
    10px 1px 0 0 #e53935,
    11px 1px 0 0 #e53935,
    /* head */
    6px 2px 0 0 var(--text-primary),
    7px 2px 0 0 var(--text-primary),
    8px 2px 0 0 var(--text-primary),
    9px 2px 0 0 var(--text-primary),
    10px 2px 0 0 var(--text-primary),
    11px 2px 0 0 var(--text-primary),
    5px 3px 0 0 var(--text-primary),
    6px 3px 0 0 #fff,
    7px 3px 0 0 #fff,
    8px 3px 0 0 #fff,
    9px 3px 0 0 #fff,
    10px 3px 0 0 #fff,
    11px 3px 0 0 #fff,
    12px 3px 0 0 var(--text-primary),
    /* eye row */
    5px 4px 0 0 var(--text-primary),
    6px 4px 0 0 #fff,
    7px 4px 0 0 var(--text-primary),
    8px 4px 0 0 #fff,
    9px 4px 0 0 #fff,
    10px 4px 0 0 #fff,
    11px 4px 0 0 #fff,
    12px 4px 0 0 var(--text-primary),
    /* beak */
    5px 5px 0 0 var(--text-primary),
    6px 5px 0 0 #fff,
    7px 5px 0 0 #fff,
    8px 5px 0 0 #fff,
    9px 5px 0 0 #fff,
    10px 5px 0 0 #fff,
    11px 5px 0 0 var(--text-primary),
    12px 5px 0 0 #f9a825,
    13px 5px 0 0 #f9a825,
    14px 5px 0 0 #f9a825,
    /* lower head + wattle */
    6px 6px 0 0 var(--text-primary),
    7px 6px 0 0 #fff,
    8px 6px 0 0 #fff,
    9px 6px 0 0 #fff,
    10px 6px 0 0 var(--text-primary),
    11px 6px 0 0 #f9a825,
    12px 6px 0 0 #f9a825,
    9px 7px 0 0 #e53935,
    10px 7px 0 0 #e53935,
    /* neck + body */
    4px 7px 0 0 var(--text-primary),
    5px 7px 0 0 var(--text-primary),
    6px 7px 0 0 var(--text-primary),
    7px 7px 0 0 #fff,
    8px 7px 0 0 #fff,
    11px 7px 0 0 var(--text-primary),
    3px 8px 0 0 var(--text-primary),
    4px 8px 0 0 #fff,
    5px 8px 0 0 #fff,
    6px 8px 0 0 #fff,
    7px 8px 0 0 #fff,
    8px 8px 0 0 #fff,
    9px 8px 0 0 #fff,
    10px 8px 0 0 #fff,
    11px 8px 0 0 var(--text-primary),
    /* wing */
    3px 9px 0 0 var(--text-primary),
    4px 9px 0 0 #fff,
    5px 9px 0 0 #ddd,
    6px 9px 0 0 #ccc,
    7px 9px 0 0 #ddd,
    8px 9px 0 0 #fff,
    9px 9px 0 0 #fff,
    10px 9px 0 0 #fff,
    11px 9px 0 0 var(--text-primary),
    3px 10px 0 0 var(--text-primary),
    4px 10px 0 0 #fff,
    5px 10px 0 0 #ddd,
    6px 10px 0 0 #ddd,
    7px 10px 0 0 #fff,
    8px 10px 0 0 #fff,
    9px 10px 0 0 #fff,
    10px 10px 0 0 var(--text-primary),
    /* lower body */
    4px 11px 0 0 var(--text-primary),
    5px 11px 0 0 #fff,
    6px 11px 0 0 #fff,
    7px 11px 0 0 #fff,
    8px 11px 0 0 #fff,
    9px 11px 0 0 var(--text-primary),
    /* tail feathers (big and colorful) */
    0px 5px 0 0 #e53935,
    1px 5px 0 0 #e53935,
    0px 6px 0 0 #e87722,
    1px 6px 0 0 #e87722,
    2px 6px 0 0 var(--text-primary),
    0px 7px 0 0 #f9a825,
    1px 7px 0 0 #f9a825,
    2px 7px 0 0 #e87722,
    0px 8px 0 0 #34a853,
    1px 8px 0 0 #34a853,
    2px 8px 0 0 #f9a825,
    1px 9px 0 0 var(--text-primary),
    2px 9px 0 0 #34a853,
    /* book held */
    12px 8px 0 0 var(--text-primary),
    13px 8px 0 0 var(--accent),
    14px 8px 0 0 var(--accent),
    15px 8px 0 0 var(--accent),
    12px 9px 0 0 var(--text-primary),
    13px 9px 0 0 #fff,
    14px 9px 0 0 #fff,
    15px 9px 0 0 var(--accent),
    12px 10px 0 0 var(--text-primary),
    13px 10px 0 0 var(--accent),
    14px 10px 0 0 var(--accent),
    15px 10px 0 0 var(--accent),
    /* legs */
    6px 12px 0 0 var(--text-primary),
    7px 12px 0 0 var(--text-primary),
    6px 13px 0 0 #f9a825,
    8px 13px 0 0 #f9a825,
    /* feet */
    5px 14px 0 0 #f9a825,
    6px 14px 0 0 #f9a825,
    7px 14px 0 0 #f9a825,
    8px 14px 0 0 #f9a825,
    9px 14px 0 0 #f9a825;
  animation: adult-proud 2.5s ease-in-out infinite;
}
/* Rooster sparkle */
.evo-adult::after {
  content: '';
  position: absolute;
  width: 1px;
  height: 1px;
  transform: scale(3);
  transform-origin: top left;
  left: 4px;
  top: 0px;
  box-shadow:
    3px 0 0 0 #ffd700,
    14px 1px 0 0 #ffd700,
    1px 4px 0 0 #ffd700,
    15px 6px 0 0 #ffd700;
  animation: sparkle 1.5s ease-in-out infinite;
}
@keyframes adult-proud {
  0%, 100% { transform: scale(3) translateY(0); }
  50% { transform: scale(3) translateY(-2px); }
}
@keyframes sparkle {
  0%, 100% { opacity: 0.2; }
  50% { opacity: 1; }
}

.evo-arrow {
  width: 24px;
  height: 2px;
  background: var(--border);
  position: relative;
  flex-shrink: 0;
}
.evo-arrow::after {
  content: '';
  position: absolute;
  right: -1px;
  top: -4px;
  border: 5px solid transparent;
  border-left: 6px solid var(--border);
}

.evo-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.evo-pages {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}
.evo-caption {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0;
}

@media (max-width: 640px) {
  .evo-timeline { gap: 0.75rem; }
  .evo-arrow { display: none; }
  .evo-timeline {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}

/* ── Mini Games Section ── */
.mini-games { background: var(--bg-primary); }
.mini-games .section-title { text-align: center; margin-bottom: 0.5rem; }
.mini-games .section-lead { text-align: center; }

.games-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}
@media (max-width: 768px) { .games-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 480px) { .games-grid { grid-template-columns: 1fr 1fr; } }

.game-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.game-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.game-icon {
  display: block;
  font-size: 2rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}
.game-card h3 {
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}
.game-card p {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.4;
}

/* ── Tools Showcase ── */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}
@media (max-width: 768px) { .tools-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .tools-grid { grid-template-columns: 1fr; } }

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.tool-icon {
  display: block;
  font-size: 2rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}
.tool-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}
.tool-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.5;
}

/* ── Demo Section ── */
.demo-showcase {
  text-align: center;
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.demo-image {
  max-width: 320px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 40px rgba(0,0,0,0.2);
}
.demo-caption {
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 380px;
}

/* ── Vietnamese Font Callout ── */
.vn-font-callout {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-top: 2.5rem;
  padding: 1.5rem 2rem;
  background: var(--bg-card);
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.vn-font-icon { font-size: 2.5rem; flex-shrink: 0; }
.vn-font-content h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.vn-font-content p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; margin: 0; }
@media (max-width: 600px) {
  .vn-font-callout { flex-direction: column; text-align: center; padding: 1.25rem; }
}

/* ── BLE Presenter Section ── */
.presenter-layout {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}
.presenter-icon {
  font-size: 4rem;
  flex-shrink: 0;
}
.presenter-content h2 {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
}
.presenter-content p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}
.presenter-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.presenter-tag {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: var(--font-mono);
  background: var(--accent);
  color: var(--bg-primary);
}
@media (max-width: 600px) {
  .presenter-layout { flex-direction: column; text-align: center; padding: 1.5rem; }
  .presenter-features { justify-content: center; }
}

/* ── Scroll Animations ── */
.fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ── Misc Utilities ── */
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-0 { margin-bottom: 0; }
.section-title { margin-bottom: 0.5rem; }
.section-lead { color: var(--text-muted); margin-bottom: 3rem; font-size: 1rem; }

/* ── Pixel Border utility (kept for backward compat) ── */
.pixel-border {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}