/* ============ theme tokens ============ */
:root,
[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e0e10;
  --bg-elev: #17171b;
  --panel: #17171b;
  --panel-2: #1f1f25;
  --border: #2a2a31;
  --border-strong: #3a3a44;
  --text: #ececf1;
  --text-dim: #9a9aa6;
  --text-muted: #6f6f7d;
  --accent: #7c5cff;
  --accent-2: #19d4b8;
  --accent-grad: linear-gradient(135deg, #7c5cff 0%, #4aa8ff 55%, #19d4b8 100%);
  --accent-soft: rgba(124,92,255,.14);
  --accent-on: #ffffff;
  --chip: #25252c;
  --chip-hover: #2f2f37;
  --code-bg: #0a0a0c;
  --code-text: #d6d6dc;
  --modal-backdrop: rgba(0,0,0,.75);
  --shadow: 0 8px 30px rgba(0,0,0,.45);
  --topbar-bg: rgba(14,14,16,.85);
  --img-overlay-bg: rgba(0,0,0,.55);
  --img-overlay-fg: #fff;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f7fb;
  --bg-elev: #ffffff;
  --panel: #ffffff;
  --panel-2: #f1f2f7;
  --border: #e3e5ec;
  --border-strong: #cfd2dc;
  --text: #1a1c25;
  --text-dim: #5b606e;
  --text-muted: #8a8e9c;
  --accent: #5b3df5;
  --accent-2: #0fb89e;
  --accent-grad: linear-gradient(135deg, #5b3df5 0%, #2691f5 55%, #0fb89e 100%);
  --accent-soft: rgba(91,61,245,.10);
  --accent-on: #ffffff;
  --chip: #eef0f6;
  --chip-hover: #e3e6f0;
  --code-bg: #f7f8fc;
  --code-text: #1a1c25;
  --modal-backdrop: rgba(20,22,30,.55);
  --shadow: 0 8px 30px rgba(20,22,40,.12);
  --topbar-bg: rgba(255,255,255,.82);
  --img-overlay-bg: rgba(20,22,30,.62);
  --img-overlay-fg: #fff;
}

/* ============ base ============ */
:root {
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "SF Pro Text", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.55;
  transition: background-color .25s ease, color .25s ease;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

button { font: inherit; cursor: pointer; }

.hidden { display: none !important; }

/* ============ topbar ============ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--topbar-bg);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background-color .25s ease, border-color .25s ease;
}
.topbar-inner {
  max-width: 1500px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-logo {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 4px 14px rgba(76, 110, 245, .25));
}
.brand-logo svg { display: block; border-radius: 9px; }
.brand h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: .3px;
}
.subtitle { margin: 2px 0 0; color: var(--text-dim); font-size: 12px; }

.search-wrap {
  flex: 1;
  max-width: 620px;
  min-width: 280px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: relative;
}
#search {
  flex: 1;
  height: 40px;
  padding: 0 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  font-size: 14px;
  outline: none;
  transition: border-color .15s, box-shadow .15s, background-color .25s;
}
#search::placeholder { color: var(--text-muted); }
#search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.result-count {
  white-space: nowrap;
  color: var(--text-dim);
  font-size: 12px;
  padding: 0 4px;
}

.theme-toggle {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-dim);
  transition: color .15s, border-color .15s, background .15s, transform .12s;
}
.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-strong);
  transform: rotate(12deg);
}
.theme-toggle .icon-sun,
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* ============ layout ============ */
.layout {
  max-width: 1500px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
}

/* ============ sidebar ============ */
.sidebar {
  position: sticky;
  top: 86px;
  align-self: start;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding-right: 6px;
}
.filter-section { margin-bottom: 28px; }
.filter-section h2 {
  margin: 0 0 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  font-weight: 600;
}
.chip-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--chip);
  color: var(--text);
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 12.5px;
  cursor: pointer;
  transition: background .15s, color .15s, transform .12s;
  user-select: none;
}
.chip:hover { background: var(--chip-hover); transform: translateY(-1px); }
.chip.active {
  background: var(--accent-grad);
  color: var(--accent-on);
  font-weight: 600;
}
.chip .count {
  background: rgba(0,0,0,.18);
  color: inherit;
  font-size: 10.5px;
  padding: 1px 7px;
  border-radius: 999px;
}
[data-theme="light"] .chip .count {
  background: rgba(20,22,30,.06);
}
.chip.active .count {
  background: rgba(255,255,255,.22);
  color: var(--accent-on);
}

.reset-btn {
  width: 100%;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 8px;
  font-size: 12.5px;
  transition: all .15s;
}
.reset-btn:hover { color: var(--text); border-color: var(--border-strong); }

.meta { margin: 14px 0 0; font-size: 11.5px; color: var(--text-dim); line-height: 1.7; }

/* ============ active filters ============ */
.active-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  min-height: 28px;
}
.active-filter {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  border-radius: 999px;
  font-size: 12px;
}
.active-filter b { color: var(--text); }
.active-filter .x {
  margin-left: 4px;
  cursor: pointer;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1;
}
.active-filter .x:hover { color: var(--accent); }

/* ============ grid ============ */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform .18s, border-color .18s, box-shadow .18s, background-color .25s;
  display: flex;
  flex-direction: column;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}
.card-image {
  position: relative;
  background: #000;
  overflow: hidden;
  aspect-ratio: 1 / 1;
}
[data-theme="light"] .card-image { background: #e9ebf1; }
.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .35s ease;
}
.card:hover .card-image img { transform: scale(1.04); }
.card-image .case-num-overlay {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--img-overlay-bg);
  color: var(--img-overlay-fg);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11px;
  letter-spacing: .5px;
  backdrop-filter: blur(6px);
}
.card-image .category-overlay {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--accent-grad);
  color: var(--accent-on);
  padding: 3px 9px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
}

.card-body {
  padding: 14px 14px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}
.card-title {
  font-size: 14.5px;
  font-weight: 600;
  margin: 0;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-author {
  color: var(--text-dim);
  font-size: 12px;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: auto;
}
.card-tag {
  font-size: 11px;
  padding: 2px 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-dim);
}
.card-tag.is-category {
  border-color: var(--accent);
  color: var(--accent);
}

.empty {
  margin-top: 60px;
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
}

/* ============ modal ============ */
.modal {
  position: fixed; inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-backdrop {
  position: absolute; inset: 0;
  background: var(--modal-backdrop);
  backdrop-filter: blur(4px);
}
.modal-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  width: min(1100px, 94vw);
  max-height: 92vh;
  overflow: hidden;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}
.modal-close {
  position: absolute;
  top: 10px; right: 10px;
  width: 32px; height: 32px;
  border: none;
  border-radius: 50%;
  background: rgba(0,0,0,.4);
  color: #fff;
  font-size: 22px;
  line-height: 28px;
  z-index: 5;
  transition: background .15s;
}
.modal-close:hover { background: var(--accent); }

.modal-body {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  overflow: hidden;
  height: 92vh;
  max-height: 92vh;
}
.modal-image-wrap {
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
[data-theme="light"] .modal-image-wrap { background: #d6d9e2; }
.modal-image-wrap img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
.modal-info {
  padding: 28px 28px 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.modal-meta {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}
.category-pill {
  background: var(--accent-grad);
  color: var(--accent-on);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
}
.case-num {
  color: var(--text-dim);
  font-size: 12px;
  letter-spacing: .5px;
  text-transform: uppercase;
}
.modal-info h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.3;
  font-weight: 600;
}
.modal-author { margin: 0; color: var(--text-dim); font-size: 13px; }
.modal-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.modal-tags .card-tag { font-size: 12px; padding: 3px 10px; }

.prompt-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 8px;
}
.prompt-header h3 {
  margin: 0;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-dim);
}
.copy-btn {
  background: var(--accent-grad);
  color: var(--accent-on);
  border: none;
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 6px;
  transition: filter .15s, transform .1s;
}
.copy-btn:hover { filter: brightness(1.06); }
.copy-btn:active { transform: scale(.97); }
.copy-btn.copied { background: #4ad295; }

.prompt-block {
  flex: 1;
  margin: 0;
  padding: 16px 18px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--code-text);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-y: auto;
  max-height: 100%;
}

/* responsive */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    max-height: none;
  }
  .modal-body { grid-template-columns: 1fr; height: auto; max-height: 92vh; overflow-y: auto; }
  .modal-image-wrap { aspect-ratio: 1/1; max-height: 50vh; }
}