/* 基本樣式，響應式網格與主題色 */
:root {
  --primary: #2563eb;
  --bg: #fff;
  --fg: #222;
  --card-bg: #f8f9fa;
  --border: #e5e7eb;
  --success: #22c55e;
  --danger: #ef4444;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #18181b;
    --fg: #f4f4f5;
    --card-bg: #23232a;
    --border: #33343a;
  }
}
body {
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, sans-serif;
  margin: 0;
  min-height: 100vh;
}
header, footer {
  padding: 1.5rem 1rem;
  text-align: center;
}
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem;
}
.category {
  margin-bottom: 2.5rem;
}
.category-title {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
  font-weight: bold;
}
.grid {
  display: grid;
  grid-gap: 1.2rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  padding: 1rem 0.7rem 0.7rem 0.7rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 1px 4px 0 #0001;
}
.card img {
  max-width: 100%;
  max-height: 120px;
  border-radius: 0.5rem;
  margin-bottom: 0.7rem;
  background: #fff;
}
.card-filename {
  font-size: 0.98rem;
  margin-bottom: 0.3rem;
  word-break: break-all;
}
.card-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.3rem;
}
.copy-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 0.4rem;
  padding: 0.3rem 0.8rem;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.2s;
}
.copy-btn:active {
  background: #1d4ed8;
}
.copy-btn[aria-label] {
  outline: 2px solid var(--primary);
}
.toast {
  position: fixed;
  left: 50%;
  bottom: 2.5rem;
  transform: translateX(-50%);
  background: var(--primary);
  color: #fff;
  padding: 0.7rem 1.5rem;
  border-radius: 0.5rem;
  font-size: 1rem;
  opacity: 0.97;
  z-index: 9999;
  box-shadow: 0 2px 8px #0002;
  pointer-events: none;
  animation: fadein 0.2s, fadeout 0.5s 1.7s;
}
@keyframes fadein {
  from { opacity: 0; }
  to { opacity: 0.97; }
}
@keyframes fadeout {
  from { opacity: 0.97; }
  to { opacity: 0; }
}
.empty-state {
  text-align: center;
  color: #888;
  margin: 3rem 0;
  font-size: 1.1rem;
}