:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: #8f8f96;
  --muted-2: #d4d4d8;
  --border: #e4e4e7;
  --hover: #fafafa;
  --blue: #2563eb;
  --gray: #a1a1aa;
  --radius: 8px;
  --radius-lg: 14px;
  --nav-h: 54px;
  --shadow-sm: 0 1px 2px rgba(10, 10, 10, 0.04), 0 8px 20px rgba(10, 10, 10, 0.05);
  --shadow-lg: 0 24px 60px rgba(10, 10, 10, 0.2), 0 4px 18px rgba(10, 10, 10, 0.1);
  --page-pad: clamp(20px, 4vw, 56px);
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
a { color: inherit; }
h1, h2, h3, p { margin: 0; }

/* --- Top nav --- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 22px;
  height: var(--nav-h);
  padding: 0 20px;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.topnav-brand {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--fg);
  white-space: nowrap;
}
.topnav-brand:hover { opacity: 0.7; }
.topnav-links { display: flex; gap: 2px; }
.topnav-links a {
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  color: var(--muted);
  padding: 7px 12px;
  border-radius: 999px;
  transition: background 0.1s, color 0.1s;
}
.topnav-links a:hover { color: var(--fg); background: var(--hover); }
.topnav-links a.active { color: var(--fg); background: var(--hover); }
.topnav-spacer { flex: 1; }
.search-trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 8px 6px 12px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  font-family: inherit;
}
.search-trigger:hover { border-color: var(--muted-2); color: var(--fg); }
.search-trigger kbd {
  font: 10px/1 -apple-system, sans-serif;
  background: var(--hover);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 5px;
  color: var(--muted);
}

/* --- Command palette --- */
.palette-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.4);
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 20px 20px;
}
.palette-overlay.open { display: flex; }
.palette {
  width: 100%;
  max-width: 560px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: palette-in 0.13s ease-out;
}
@keyframes palette-in {
  from { opacity: 0; transform: translateY(-8px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
#palette-input {
  width: 100%;
  border: none;
  outline: none;
  padding: 17px 18px;
  font-size: 16px;
  border-bottom: 1px solid var(--border);
  background: transparent;
  color: var(--fg);
  font-family: inherit;
}
.palette-results { max-height: 360px; overflow-y: auto; padding: 6px; }
.palette-row {
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 13.5px;
  cursor: pointer;
}
.palette-row.selected { background: var(--hover); }
.palette-empty, .palette-hint {
  padding: 26px 12px;
  text-align: center;
  font-size: 12.5px;
  color: var(--muted);
}
.palette-footer {
  display: flex;
  gap: 16px;
  padding: 9px 14px;
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--muted);
}
.palette-footer kbd {
  font: 10px/1 -apple-system, sans-serif;
  background: var(--hover);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 5px;
  margin-right: 4px;
}

/* --- Shared form/components --- */
input[type="text"] {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: var(--radius);
  padding: 9px 12px;
  font-size: 14px;
  outline: none;
  font-family: inherit;
}
input[type="text"]:focus { border-color: var(--fg); }
button {
  background: var(--fg);
  color: var(--bg);
  border: 1px solid var(--fg);
  border-radius: var(--radius);
  padding: 0 16px;
  height: 36px;
  font-weight: 500;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
}
button:disabled { opacity: 0.4; cursor: default; }
button.ghost {
  background: var(--bg);
  color: var(--fg);
  border-color: var(--border);
}
.edge {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--fg);
  text-decoration: none;
  display: inline-block;
}
.edge:hover { border-color: var(--fg); }
.edge .via { color: var(--muted); font-size: 10px; margin-right: 4px; }

.section-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 24px 0 8px;
}

/* --- Full-width page shell --- */
/* Every page (bar Graph, which is its own full-bleed stage) uses this: no
   narrow centered reading column — content spans the viewport and wraps
   into a responsive grid instead, with a comfortable side gutter. */
.page { width: 100%; padding: 40px var(--page-pad) 100px; }

/* --- Elevated card, same language as the command palette: rounded,
   bordered, a soft floating shadow instead of a flat divider line. --- */
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

/* --- Segmented control (e.g. bookshelf sort) --- */
.segmented {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  background: var(--hover);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.segmented button {
  background: transparent;
  color: var(--muted);
  border: none;
  height: 28px;
  padding: 0 13px;
  font-size: 12px;
  font-weight: 500;
  border-radius: 999px;
}
.segmented button.active {
  background: var(--bg);
  color: var(--fg);
  box-shadow: var(--shadow-sm);
}
.segmented button:hover:not(.active) { color: var(--fg); }