/* ── DESIGN TOKENS — WINTER LIGHT (default) ──────── */
:root {
  /* Backgrounds */
  --color-bg:            #F2F6FA;
  --color-bg-subtle:     #E8EFF6;
  --color-surface:       #FFFFFF;

  /* Foreground */
  --color-fg:            #1A2332;
  --color-fg-muted:      #4A6080;
  --color-fg-subtle:     #8DAAC4;

  /* Accent — steel blue (AA-compliant: ~5.55:1 on snow) */
  --color-accent:        #2563A8;
  --color-accent-hover:  #1A4E8C;
  --color-accent-fg:     #FFFFFF;
  --color-accent-glow:   rgba(37, 99, 168, 0.12);

  /* Structure */
  --color-border:        #C8D8EA;
  --color-border-subtle: #E0EAF4;
  --color-shadow:        rgba(26, 35, 50, 0.08);

  /* Hero — always over a dark photo overlay, unaffected by theme */
  --color-hero-fg:             #EDF4FA;
  --color-hero-overlay-start:  rgba(5, 10, 22, 0.52);
  --color-hero-overlay-end:    rgba(5, 10, 22, 0.70);

  /* Radii */
  --radius-sm:   8px;
  --radius-md:   14px;
  --radius-pill: 9999px;

  /* Typography & motion — theme-invariant */
  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'IBM Plex Mono', 'Courier New', monospace;
  --ease:         200ms ease;
}

/* ── WINTER DARK — system preference (no JS) ─────── */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg:            #0C1220;
    --color-bg-subtle:     #111826;
    --color-surface:       #182236;
    --color-fg:            #E8EFF7;
    --color-fg-muted:      #7A9EC0;
    --color-fg-subtle:     #4A6880;
    --color-accent:        #7EC8F0;
    --color-accent-hover:  #A8DAEF;
    --color-accent-fg:     #0C1220;
    --color-accent-glow:   rgba(126, 200, 240, 0.15);
    --color-border:        #1E3550;
    --color-border-subtle: #182840;
    --color-shadow:        rgba(0, 0, 0, 0.40);
  }
}

/* ── WINTER DARK — explicit toggle ───────────────── */
:root[data-theme="dark"] {
  --color-bg:            #0C1220;
  --color-bg-subtle:     #111826;
  --color-surface:       #182236;
  --color-fg:            #E8EFF7;
  --color-fg-muted:      #7A9EC0;
  --color-fg-subtle:     #4A6880;
  --color-accent:        #7EC8F0;
  --color-accent-hover:  #A8DAEF;
  --color-accent-fg:     #0C1220;
  --color-accent-glow:   rgba(126, 200, 240, 0.15);
  --color-border:        #1E3550;
  --color-border-subtle: #182840;
  --color-shadow:        rgba(0, 0, 0, 0.40);
}

/* ── WINTER LIGHT — explicit override ────────────── */
/* Restores light palette when system is dark but user toggled light */
:root[data-theme="light"] {
  --color-bg:            #F2F6FA;
  --color-bg-subtle:     #E8EFF6;
  --color-surface:       #FFFFFF;
  --color-fg:            #1A2332;
  --color-fg-muted:      #4A6080;
  --color-fg-subtle:     #8DAAC4;
  --color-accent:        #2563A8;
  --color-accent-hover:  #1A4E8C;
  --color-accent-fg:     #FFFFFF;
  --color-accent-glow:   rgba(37, 99, 168, 0.12);
  --color-border:        #C8D8EA;
  --color-border-subtle: #E0EAF4;
  --color-shadow:        rgba(26, 35, 50, 0.08);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  transition: background var(--ease), color var(--ease);
}

/* ── HERO ─────────────────────────────────────────── */
.hero {
  position: relative;
  height: 40vh;
  min-height: 260px;
  background-image: url('../img/hero-image-01.webp');
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    var(--color-hero-overlay-start) 0%,
    var(--color-hero-overlay-end)   100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 0 2rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 300;
  font-style: italic;
  color: var(--color-hero-fg);
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: 0.8rem;
}

.hero p {
  font-family: var(--font-body);
  font-size: 0.7rem;
  color: rgba(253, 250, 245, 0.5);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ── THEME TOGGLE ─────────────────────────────────── */
.theme-toggle {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  z-index: 2;
  background: rgba(253, 250, 245, 0.12);
  border: 1px solid rgba(253, 250, 245, 0.25);
  color: var(--color-hero-fg);
  font-family: var(--font-body);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  backdrop-filter: blur(6px);
  transition: background var(--ease), border-color var(--ease);
}

.theme-toggle:hover {
  background: rgba(253, 250, 245, 0.22);
  border-color: rgba(253, 250, 245, 0.45);
}

/* ── MAIN ─────────────────────────────────────────── */
main {
  flex: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
  width: 100%;
}

/* ── FILTERS ──────────────────────────────────────── */
.filters {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-bottom: 2rem;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.filter-pill {
  font-family: var(--font-body);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.28rem 0.7rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-fg-muted);
  cursor: pointer;
  line-height: 1.5;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
  white-space: nowrap;
}

.filter-pill:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-pill.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-fg);
}

/* ── EXTENSION GRID ───────────────────────────────── */
@keyframes slideIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0);    }
}

.ext-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 0.65rem;
}

.ext-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  animation: slideIn 0.35s ease both;
  transition: border-color var(--ease), box-shadow var(--ease), transform var(--ease);
}

.ext-card.hidden {
  display: none;
}

.ext-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 18px var(--color-accent-glow);
  transform: translateY(-2px);
}

.ext-card-inner {
  display: flex;
  flex-direction: column;
  padding: 0.9rem;
  text-decoration: none;
  color: var(--color-fg);
  height: 100%;
  gap: 0.65rem;
}

.ext-name {
  font-size: 0.79rem;
  font-weight: 500;
  line-height: 1.4;
  flex: 1;
  transition: color var(--ease);
}

.ext-card:hover .ext-name {
  color: var(--color-accent);
}

.ext-meta {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

/* ── BROWSER BADGES ───────────────────────────────── */
.browser-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
}

.browser-badge {
  font-size: 0.52rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.1rem 0.38rem;
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-fg-muted);
  border: 1px solid var(--color-border);
  white-space: nowrap;
}

/* ── TAG PILLS ────────────────────────────────────── */
.ext-tag-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
}

.tag-pill {
  font-size: 0.5rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.1rem 0.38rem;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-fg-muted);
  border: 1px solid var(--color-border);
  white-space: nowrap;
  opacity: 0.65;
}

/* ── EMPTY STATE ──────────────────────────────────── */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--color-fg-muted);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  padding: 3.5rem 0;
}

/* ── FOOTER ───────────────────────────────────────── */
footer {
  border-top: 1px solid var(--color-border);
  padding: 1.25rem 2rem;
  text-align: center;
  font-size: 0.67rem;
  color: var(--color-fg-muted);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

footer a {
  color: var(--color-fg-muted);
  text-decoration: none;
  transition: color var(--ease);
}

footer a:hover {
  color: var(--color-accent);
}

/* ── RESPONSIVE ───────────────────────────────────── */
@media (max-width: 600px) {
  .hero h1 { font-size: 2.2rem; }
  main { padding: 2rem 1.25rem 3.5rem; }

  .ext-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}