:root {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #30363d;
  --text: #c9d1d9;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --pos: #3fb950;
  --neg: #f85149;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

header h1 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.controls {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.control {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}

select,
.controls button {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-family: inherit;
}

.controls button {
  cursor: pointer;
}

.controls button:disabled {
  cursor: wait;
  opacity: 0.65;
}

.controls button:hover,
select:hover {
  border-color: var(--accent);
}

.why-btn {
  min-width: 3.2rem;
}

.stats {
  color: var(--text-dim);
  font-size: 0.85rem;
}
.stats span {
  color: var(--text);
  font-weight: 600;
}

main {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 1rem;
  padding: 1rem 1.5rem;
  height: calc(100vh - 60px);
  overflow: hidden;
}

#feed, #viz {
  overflow-y: auto;
  padding-right: 0.5rem;
}

#feed::-webkit-scrollbar,
#viz::-webkit-scrollbar { width: 6px; }
#feed::-webkit-scrollbar-thumb,
#viz::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

h2 {
  margin: 0 0 0.5rem 0;
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h3 {
  margin: 0 0 0.4rem 0;
  font-size: 0.9rem;
  color: var(--text);
}

.hint {
  margin: 0 0 0.75rem 0;
  font-size: 0.8rem;
  color: var(--text-dim);
}

#items {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  align-items: stretch;
}

.item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  min-height: 360px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.item:hover { border-color: #444c56; }

.item-visual {
  position: relative;
}

.item-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  object-fit: cover;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.rank-badge {
  position: absolute;
  left: 0.8rem;
  top: 0.8rem;
  max-width: calc(100% - 1.6rem);
  background: rgba(2, 6, 23, 0.82);
  border: 1px solid rgba(88, 166, 255, 0.42);
  border-radius: 4px;
  color: #f0f6fc;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  padding: 0.28rem 0.48rem;
}

.item-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 0.8rem 0.9rem 0.9rem;
}

.recommendation-row {
  align-items: center;
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.45rem;
}

.decision-pill {
  border: 1px solid rgba(88, 166, 255, 0.32);
  border-radius: 4px;
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.42rem;
  text-transform: uppercase;
}

.decision-exploring,
.decision-taste-probe {
  border-color: rgba(255, 166, 87, 0.42);
  color: var(--warn, #ffa657);
}

.decision-random-baseline {
  border-color: rgba(139, 148, 158, 0.45);
  color: var(--text-dim);
}

.match-number {
  color: #f0f6fc;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.78rem;
  font-weight: 800;
}

.match-meter {
  background: rgba(139, 148, 158, 0.18);
  border-radius: 999px;
  height: 0.35rem;
  margin-bottom: 0.65rem;
  overflow: hidden;
}

.match-meter span {
  background: linear-gradient(90deg, var(--accent), var(--pos));
  border-radius: inherit;
  display: block;
  height: 100%;
}

.item-title {
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.35rem;
}

.rank-reason {
  color: var(--text-dim);
  font-size: 0.78rem;
  line-height: 1.35;
  margin: 0 0 0.45rem;
}

.item-meta {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
  font-family: ui-monospace, SFMono-Regular, monospace;
}
.item-snippet {
  color: var(--text-dim);
  margin-bottom: 0.6rem;
  font-size: 0.84rem;
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.item-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
}

.tag {
  background: rgba(88, 166, 255, 0.12);
  color: var(--accent);
  padding: 0.1rem 0.45rem;
  border-radius: 12px;
  font-size: 0.7rem;
  border: 1px solid rgba(88, 166, 255, 0.25);
}

.item-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}
.item-actions button,
.item-actions a {
  flex: 1;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.4rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  font-family: inherit;
  text-align: center;
  text-decoration: none;
}
.item-actions button:disabled {
  cursor: wait;
  opacity: 0.55;
}
.item-actions .open-article {
  flex-basis: 100%;
}
.item-actions .open-article:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.item-actions .like:hover {
  background: rgba(63, 185, 80, 0.15);
  border-color: var(--pos);
  color: var(--pos);
}
.item-actions .skip:hover {
  background: rgba(248, 81, 73, 0.1);
  border-color: var(--neg);
  color: var(--neg);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.9rem 1rem;
  margin-bottom: 0.75rem;
}

.tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}
.tab {
  background: transparent;
  color: var(--text-dim);
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.5rem 0.85rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: -1px;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.regret-status {
  margin-top: 0.6rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}
.regret-status.error { color: var(--neg); }

.why-dialog {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  max-width: min(760px, calc(100vw - 32px));
  padding: 1.25rem;
}

.why-dialog::backdrop {
  background: rgba(1, 4, 9, 0.72);
}

.why-dialog h2 {
  color: var(--accent);
  font-size: 0.85rem;
  margin-bottom: 0.8rem;
}

.why-dialog p {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin: 0;
}

.dialog-close {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  float: right;
  font-size: 1rem;
  height: 2rem;
  line-height: 1;
  width: 2rem;
}

.dialog-close:hover {
  border-color: var(--accent);
}

.why-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1rem;
}

.why-grid section {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.85rem;
}

.why-grid h3 {
  color: var(--text);
  font-size: 0.88rem;
  margin-bottom: 0.35rem;
}

.chart-wrap {
  height: 220px;
  position: relative;
}
.chart-wrap-tall {
  height: 360px;
}

#why-pick {
  font-size: 0.85rem;
}
.why-pick-empty {
  color: var(--text-dim);
  font-style: italic;
}
.why-row {
  display: flex;
  justify-content: space-between;
  padding: 0.25rem 0;
  border-bottom: 1px dashed var(--border);
}
.why-row:last-child { border-bottom: none; }
.why-label { color: var(--text-dim); }
.why-value {
  font-family: ui-monospace, SFMono-Regular, monospace;
  color: var(--text);
}

.flash-good { animation: flashGood 0.45s ease-out; }
.flash-bad { animation: flashBad 0.45s ease-out; }
@keyframes flashGood {
  0% { background: rgba(63, 185, 80, 0.35); border-color: var(--pos); }
  100% { background: var(--panel); border-color: var(--border); }
}
@keyframes flashBad {
  0% { background: rgba(248, 81, 73, 0.22); border-color: var(--neg); }
  100% { background: var(--panel); border-color: var(--border); }
}

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; height: auto; }
  #feed, #viz { overflow-y: visible; max-height: none; }
}

@media (max-width: 640px) {
  header, .controls { align-items: flex-start; flex-direction: column; }
  #items { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
}