:root {
  --black: #111;
  --white: #FFFDF6;
  --yellow: #FFD700;
  --pink: #FF6B9D;
  --cyan: #00E5FF;
  --lime: #39FF14;
  --orange: #FF8C00;
  --muted: #555;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
}

body {
  font-family: "Inter", "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  background: var(--white);
  color: var(--black);
  -webkit-font-smoothing: antialiased;
}

/* === Keyframes === */
@keyframes card-in {
  from { opacity: 0; transform: translateY(30px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* === Header === */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 28px;
  border-bottom: 4px solid var(--black);
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  gap: 16px;
  align-items: center;
}

.logo {
  width: 56px;
  height: 56px;
  background: var(--yellow);
  border: 4px solid var(--black);
  box-shadow: 6px 6px 0 var(--black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 20px;
  color: var(--black);
  transform: rotate(-3deg);
}

.brand-text h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.5px;
}

.brand-text .tag {
  margin: 2px 0 0;
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
}

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

#search {
  padding: 10px 14px;
  border: 3px solid var(--black);
  box-shadow: 4px 4px 0 var(--black);
  font-size: 14px;
  font-weight: 700;
  min-width: 200px;
  background: var(--white);
  color: var(--black);
}

#search:focus {
  outline: none;
  box-shadow: 2px 2px 0 var(--black);
  transform: translate(2px, 2px);
}

/* === Theme Toggle === */
#toggleTheme {
  width: 40px;
  height: 40px;
  border: 3px solid var(--black);
  box-shadow: 3px 3px 0 var(--black);
  font-size: 18px;
  cursor: pointer;
  background: var(--white);
  color: var(--black);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s, box-shadow 0.1s;
  flex-shrink: 0;
}

#toggleTheme:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--black);
}

#toggleTheme:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--black);
}

/* === Tags === */
.tags {
  display: flex;
  gap: 8px;
  padding: 16px 28px;
  flex-wrap: wrap;
  border-bottom: 4px solid var(--black);
  background: #f0f0e8;
}

.tag-btn {
  padding: 8px 16px;
  border: 3px solid var(--black);
  box-shadow: 4px 4px 0 var(--black);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  cursor: pointer;
  background: var(--white);
  color: var(--black);
  transition: transform 0.1s, box-shadow 0.1s;
}

.tag-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--black);
}

.tag-btn.active {
  background: var(--black);
  color: var(--white);
  box-shadow: 2px 2px 0 var(--black);
  transform: translate(2px, 2px);
}

/* === Grid === */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  padding: 28px;
}

/* === Card === */
.card {
  padding: 20px;
  border: 4px solid var(--black);
  box-shadow: 6px 6px 0 var(--black);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  display: flex;
  flex-direction: column;
  animation: card-in 0.35s ease both;
  transform: rotate(var(--rot, 0deg));
}

.card:hover {
  transform: translate(-4px, -4px) rotate(0deg);
  box-shadow: 10px 10px 0 var(--black);
}

.card .meta {
  display: flex;
  gap: 14px;
  align-items: center;
}

.favicon {
  width: 48px;
  height: 48px;
  border: 3px solid var(--black);
  box-shadow: 3px 3px 0 var(--black);
  flex: 0 0 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 18px;
  background: var(--white);
  position: relative;
}

.favicon-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.card h3 {
  margin: 8px 0 4px;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.3px;
}

.card p {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

.card .actions {
  margin-top: 16px;
  display: flex;
  gap: 10px;
}

/* === Button === */
.btn {
  padding: 10px 16px;
  border: 3px solid var(--black);
  box-shadow: 4px 4px 0 var(--black);
  font-weight: 800;
  font-size: 13px;
  text-transform: uppercase;
  cursor: pointer;
  text-decoration: none;
  color: var(--black);
  transition: transform 0.1s, box-shadow 0.1s;
  flex: 1;
  text-align: center;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--black);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--black);
}

.btn-primary {
  background: var(--yellow);
}

/* === Empty State === */
.empty-state {
  grid-column: 1 / -1;
  padding: 60px 20px;
  text-align: center;
  border: 4px solid var(--black);
  box-shadow: 8px 8px 0 var(--black);
  background: var(--white);
}

.empty-icon {
  font-size: 48px;
  font-weight: 900;
  margin-bottom: 12px;
}

.empty-state p {
  font-size: 18px;
  font-weight: 800;
  margin: 0;
  color: var(--muted);
}

/* === Footer === */
footer {
  padding: 20px 28px;
  border-top: 4px solid var(--black);
  background: #f0f0e8;
  font-weight: 700;
  font-size: 13px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-links {
  display: flex;
  gap: 12px;
}

.footer-links a {
  color: var(--black);
  text-decoration: none;
  font-weight: 800;
  border-bottom: 3px solid var(--yellow);
}

.footer-links a:hover {
  background: var(--yellow);
}

/* === Card Color Classes === */
.card-color-yellow { background: #FFF3B0; }
.card-color-pink { background: #FFD6E0; }
.card-color-cyan { background: #CCF5FF; }
.card-color-lime { background: #D4FFC8; }
.card-color-orange { background: #FFE0B2; }
.card-color-lavender { background: #E8D6FF; }
.card-color-coral { background: #FFC0B0; }

/* === Dark Mode === */
:root.dark {
  --black: #FFFDF6;
  --white: #0f1720;
  --muted: #9aa4b2;
}

:root.dark .tags,
:root.dark footer {
  background: #0a0f18;
}

:root.dark .card-color-yellow { background: #3a3000; }
:root.dark .card-color-pink { background: #3a0018; }
:root.dark .card-color-cyan { background: #002a3a; }
:root.dark .card-color-lime { background: #0a2a00; }
:root.dark .card-color-orange { background: #3a1a00; }
:root.dark .card-color-lavender { background: #1a003a; }
:root.dark .card-color-coral { background: #3a0800; }

/* === Responsive === */
@media (max-width: 640px) {
  .site-header {
    padding: 14px;
    flex-direction: column;
    align-items: stretch;
  }

  .brand {
    justify-content: center;
  }

  .controls {
    flex-direction: column;
  }

  #search {
    min-width: 100%;
    width: 100%;
  }

  .tags {
    padding: 12px 14px;
    justify-content: center;
  }

  .grid {
    padding: 14px;
    gap: 16px;
    grid-template-columns: 1fr;
  }

  footer {
    padding: 14px;
    flex-direction: column;
    text-align: center;
  }
}