@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=IBM+Plex+Sans:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* RJS Studio design tokens */
:root {
  --bg: #f4f2ec;
  --bg-surface: #faf9f5;
  --bg-raised: #ffffff;
  --fg: #17160f;
  --fg-secondary: rgba(23,22,15,0.62);
  --fg-muted: rgba(23,22,15,0.40);
  --accent: #25984d;
  --accent-ink: #faf9f5;
  --border-subtle: rgba(23,22,15,0.14);
  --border-strong: rgba(23,22,15,0.30);

  /* Internal aliases for backward compat with app.js color refs */
  --panel: var(--bg-surface);
  --ink: var(--fg);
  --muted: var(--fg-muted);
  --line: var(--border-subtle);
  --accent-soft: #e7f3ec;
  --chip: #efece4;
  --pre-bg: #17160f;
  --pre-ink: #f4f2ec;
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  font-family: var(--font-sans);
}

/* Dark mode: .dark on <html> */
.dark {
  --bg: #181712;
  --bg-surface: #211f19;
  --bg-raised: #2b2921;
  --fg: #f4f2ec;
  --fg-secondary: rgba(244,242,236,0.62);
  --fg-muted: rgba(244,242,236,0.40);
  --accent: #38c86e;
  --accent-ink: #11100c;
  --border-subtle: rgba(244,242,236,0.14);
  --border-strong: rgba(244,242,236,0.30);

  --accent-soft: #1d2a20;
  --chip: #26241c;
  --pre-bg: #0c0b08;
  --pre-ink: #f4f2ec;
}

/* Studio typography: grotesk display headings, mono labels/code. */
.brand h1, .card-title, .article h1.title, .md h2, .md h3, .cp-title {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}
.chip, .md code, .md pre { font-family: var(--font-mono); }

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  display: flex;
  background: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.6;
}

/* ---------- Sidebar ---------- */
#sidebar {
  width: 320px;
  flex-shrink: 0;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 20px 18px;
  gap: 16px;
}
.brand-row { display: flex; align-items: center; justify-content: space-between; }
.brand h1 { margin: 0; font-size: 22px; letter-spacing: -0.02em; font-weight: 650; }
.brand .sub { font-size: 12px; color: var(--fg-muted); }
.icon-btn {
  background: none; color: var(--fg-muted); padding: 2px 8px; font-size: 17px;
  border: 1px solid var(--border-subtle); border-radius: 8px;
}
.icon-btn:hover { color: var(--accent); }

.search {
  border: 1px solid var(--border-subtle); border-radius: 8px; padding: 8px 11px;
  font-size: 13px; background: var(--bg); color: var(--fg);
}
.search:focus { outline: none; border-color: var(--accent); }

#add-form { display: flex; flex-direction: column; gap: 8px; }
#add-form input, #add-form select {
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 9px 11px;
  font-size: 14px;
  background: var(--bg);
  color: var(--fg);
}
#add-form input:focus, #add-form select:focus {
  outline: none; border-color: var(--accent);
}
.row { display: flex; gap: 8px; }
.row select { flex: 1; }
button {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 550;
  transition: opacity 0.15s;
}
button:hover { opacity: 0.9; }
button:disabled { opacity: 0.5; cursor: default; }

.progress {
  font-size: 13px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.progress .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  animation: pulse 1s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.3; } }

.list { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 2px; }
.item {
  border-radius: 8px;
  padding: 9px 11px;
  cursor: pointer;
}
.item:hover { background: var(--bg); }
.item.active { background: var(--accent-soft); }
.item .t { font-size: 14px; font-weight: 550; line-height: 1.3; }
.item .s { font-size: 12px; color: var(--fg-muted); }

.health { font-size: 11px; color: var(--fg-muted); border-top: 1px solid var(--border-subtle); padding-top: 10px; display: flex; flex-direction: column; gap: 3px; }

/* ---------- Main ---------- */
#main { flex: 1; height: 100vh; display: flex; flex-direction: column; }
.tabs { display: flex; gap: 4px; padding: 14px 28px 0; border-bottom: 1px solid var(--border-subtle); }
.tab {
  background: none; color: var(--fg-muted);
  border-radius: 8px 8px 0 0; padding: 8px 16px; font-weight: 550;
}
.tab.active { color: var(--accent); background: var(--accent-soft); }
.view { flex: 1; overflow-y: auto; }
.hidden { display: none !important; }

.empty { max-width: 480px; margin: 18vh auto; text-align: center; color: var(--fg-muted); }
.empty .hint { font-size: 13px; }

/* ---------- Library cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  padding: 28px 32px 60px;
  max-width: 1100px;
  margin: 0 auto;
}
.card {
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 18px 20px;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s, box-shadow 0.15s;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.card-title { margin: 0 0 4px; font-size: 17px; line-height: 1.3; letter-spacing: -0.01em; }
.card-src { font-size: 12px; color: var(--accent); text-decoration: none; display: inline-block; margin-bottom: 10px; }
.card-src:hover { text-decoration: underline; }
.card-sum { margin: 0 0 12px; font-size: 13.5px; color: var(--fg-muted); line-height: 1.55; }
.chips.small .chip { font-size: 11px; padding: 2px 8px; }

/* ---------- Reader bar ---------- */
.reader-bar { padding: 12px 32px; border-bottom: 1px solid var(--border-subtle); }
.ghost-btn {
  background: none; color: var(--fg-muted); border: 1px solid var(--border-subtle);
  border-radius: 8px; padding: 6px 12px; font-size: 13px;
}
.ghost-btn:hover { color: var(--accent); border-color: var(--accent); }
.src .spacer { flex: 1; }

/* ---------- Article ---------- */
.article { max-width: 740px; margin: 0 auto; padding: 36px 32px 100px; }
.article h1.title { font-size: 32px; line-height: 1.15; margin: 0 0 8px; letter-spacing: -0.025em; font-weight: 680; }
.article .src { font-size: 13px; color: var(--fg-muted); margin-bottom: 16px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.article .src a { color: var(--accent); text-decoration: none; }
.article .src a:hover { text-decoration: underline; }
.del { background: none; color: #c0392b; padding: 2px 8px; font-size: 12px; border: 1px solid var(--border-subtle); border-radius: 6px; }
.refresh { background: none; color: var(--fg-muted); padding: 2px 8px; font-size: 12px; border: 1px solid var(--border-subtle); border-radius: 6px; }
.refresh:hover { color: var(--accent); }

.summary { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-left: 3px solid var(--accent); border-radius: 8px; padding: 12px 16px; font-size: 14px; color: var(--fg-secondary); margin-bottom: 18px; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 24px; }
.chip { font-size: 12px; background: var(--chip); color: var(--fg-muted); padding: 3px 10px; border-radius: 20px; }
.chip.concept { background: var(--accent-soft); color: var(--accent); }

.md { font-size: 15.5px; }
.md h2 { font-size: 20px; margin-top: 32px; letter-spacing: -0.01em; }
.md h3 { font-size: 16px; margin-top: 24px; }
.md a { color: var(--accent); }
.md code { background: var(--chip); padding: 1px 5px; border-radius: 4px; font-size: 13px; }
.md pre { background: var(--pre-bg); color: var(--pre-ink); padding: 14px; border-radius: 8px; overflow-x: auto; }
.md pre code { background: none; color: inherit; }
.md blockquote { border-left: 3px solid var(--border-subtle); margin-left: 0; padding-left: 16px; color: var(--fg-muted); }
.md img { max-width: 100%; }

.related { margin-top: 48px; border-top: 1px solid var(--border-subtle); padding-top: 20px; }
.related h3 { font-size: 14px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--fg-muted); }
.related-item { padding: 8px 0; cursor: pointer; border-bottom: 1px solid var(--border-subtle); }
.related-item:hover .rt { color: var(--accent); }
.related-item .rt { font-weight: 550; }
.related-item .rs { font-size: 12px; color: var(--fg-muted); }

/* ---------- Graph ---------- */
#graph { position: relative; display: flex; flex-direction: column; overflow: hidden; }
.graph-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px; border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface); z-index: 2;
}
.legend { display: flex; gap: 16px; font-size: 12px; color: var(--fg-muted); }
.lg { display: flex; align-items: center; gap: 6px; }
.dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.dot.art { background: var(--accent); border-radius: 3px; }
.dot.top { background: #c4bdac; }
.dot.theme { background: #25984d; border-radius: 3px; }
.dot.bridge { background: #b26b00; }
.dark .dot.top { background: #6a6458; }
.lg-hint { font-style: italic; opacity: 0.7; }
.graph-actions { display: flex; align-items: center; gap: 12px; }
.gstats { font-size: 12px; color: var(--fg-muted); }

.graph-stage { flex: 1; display: flex; min-height: 0; }
#cy { flex: 1; min-width: 0; min-height: 0; background: var(--bg-raised); }
.cy-empty { display: grid; place-items: center; height: 100%; color: var(--fg-muted); }

/* context panel */
.cy-panel {
  width: 340px; flex-shrink: 0; border-left: 1px solid var(--border-subtle);
  background: var(--bg-surface); overflow-y: auto; display: flex; flex-direction: column;
}
.cp-head {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 10px;
  padding: 16px 18px; border-bottom: 1px solid var(--border-subtle); position: sticky; top: 0;
  background: var(--bg-surface);
}
.cp-kind { font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--accent); }
.cp-title { margin: 3px 0 0; font-size: 18px; line-height: 1.2; }
.cp-close { background: none; color: var(--fg-muted); font-size: 20px; padding: 0 6px; border-radius: 6px; line-height: 1; }
.cp-close:hover { color: var(--fg); background: var(--bg); }
.cp-body { padding: 8px 18px 24px; }
.cp-refhdr { font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--fg-muted); padding: 10px 0 2px; }
.cp-ctx { padding: 14px 0; border-bottom: 1px solid var(--border-subtle); }
.cp-ref { display: flex; align-items: baseline; gap: 8px; }
.cp-num {
  flex-shrink: 0; width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  font-size: 11px; font-weight: 600; display: grid; place-items: center;
}
.cp-paper { font-size: 14px; font-weight: 600; color: var(--accent); cursor: pointer; line-height: 1.3; }
.cp-paper:hover { text-decoration: underline; }
.cp-host { display: inline-block; margin: 3px 0 0 26px; font-size: 11px; color: var(--fg-muted); text-decoration: none; }
.cp-host:hover { color: var(--accent); }
.cp-snip { margin: 8px 0 0 26px; font-size: 13px; line-height: 1.6; color: var(--fg); }
.cp-empty { color: var(--fg-muted); font-size: 13px; }

.cy-tip {
  position: absolute; pointer-events: none; z-index: 5;
  background: var(--fg); color: var(--bg);
  padding: 6px 10px; border-radius: 8px; font-size: 12px;
  display: flex; flex-direction: column; gap: 1px; max-width: 220px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
}
.cy-tip b { font-weight: 600; }
.cy-tip span { opacity: 0.7; font-size: 11px; }
