:root {
  --primary: #6366f1;
  --primary-600: #4f46e5;
  --primary-50: #eef2ff;
  --bg: #0b1020;
  --bg-elev: #11182c;
  --bg-soft: #0f172a;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --card: #0f172a;
  --border: #1f2a44;
  --success: #16a34a;
  --warn: #f59e0b;
  --danger: #ef4444;
}

:root[data-theme="light"] {
  --bg: #f8fafc;
  --bg-elev: #ffffff;
  --bg-soft: #f1f5f9;
  --text: #0f172a;
  --muted: #475569;
  --card: #ffffff;
  --border: #e2e8f0;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.35;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: linear-gradient(90deg, color-mix(in oklab, var(--primary) 14%, transparent), transparent 60%),
              var(--bg-elev);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(6px);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}
.logo {
  width: 40px; height: 40px;
  border-radius: 10px;
  display: grid; place-items: center;
  background: radial-gradient(75% 75% at 30% 30%, var(--primary) 0%, transparent 70%),
              radial-gradient(65% 65% at 70% 70%, var(--secondary) 0%, transparent 70%);
  color: white;
  font-weight: 800;
  letter-spacing: -1px;
  box-shadow: 0 4px 18px rgba(0,0,0,.25), inset 0 0 0 1px rgba(255,255,255,.08);
}
.title h1 {
  margin: 0; font-size: 18px; letter-spacing: .2px;
}
.title p {
  margin: 2px 0 0;
  color: var(--muted); font-size: 12px;
}

.customization {
  display: flex; gap: 10px; align-items: center;
}
.chip {
  display: inline-flex; gap: 8px; align-items: center;
  padding: 6px 8px; border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
}
.chip label { font-size: 12px; color: var(--muted); }
.chip input[type="color"], .chip select {
  appearance: none;
  width: 28px; height: 24px; border: none; background: transparent; padding: 0;
  cursor: pointer;
}

.app {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 14px;
  padding: 14px;
  min-height: calc(100vh - 88px);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: calc(100vh - 120px);
  overflow: auto;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,.18);
}
.panel h2 {
  margin: 0 0 8px 0;
  font-size: 14px;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: .3px;
}
.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 6px;
}
.field { display: grid; gap: 6px; }
.field label { font-size: 12px; color: var(--muted); }
.field input, .field select {
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
  outline: none;
}
.field input:focus, .field select:focus {
  border-color: color-mix(in oklab, var(--primary) 50%, var(--border));
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--primary) 20%, transparent);
}

.grid {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
  align-items: end;
  margin-top: 8px;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-soft));
  color: var(--text);
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 13px;
  cursor: pointer;
  transition: transform .06s ease, background .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.primary {
  background: linear-gradient(180deg, color-mix(in oklab, var(--primary) 35%, var(--bg-elev)), color-mix(in oklab, var(--primary) 22%, var(--bg-soft)));
  border-color: color-mix(in oklab, var(--primary) 55%, var(--border));
  color: white;
}
.btn.ghost {
  background: transparent;
}
.btn.warn { border-color: color-mix(in oklab, var(--warn) 60%, var(--border)); color: color-mix(in oklab, var(--warn) 90%, white); }
.btn.danger { border-color: color-mix(in oklab, var(--danger) 60%, var(--border)); color: color-mix(in oklab, var(--danger) 90%, white); }

.list { list-style: none; margin: 6px 0 0; padding: 0; }
.list li { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--border); background: var(--bg-soft); margin-bottom: 6px; }
.list.compact li { padding: 4px 6px; font-size: 12px; }
.list .left { display: flex; gap: 8px; align-items: center; overflow: hidden; }
.badge {
  display: inline-flex; gap: 6px; align-items: center;
  padding: 2px 6px; border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  font-size: 12px;
}
.dot {
  width: 10px; height: 10px; border-radius: 50%;
  box-shadow: 0 0 0 2px rgba(255,255,255,.1) inset;
}
.small { font-size: 12px; color: var(--muted); }

.graph {
  position: relative;
  background: radial-gradient(1200px 600px at 30% 0%, color-mix(in oklab, var(--primary) 9%, transparent), transparent),
              radial-gradient(900px 900px at 90% 10%, color-mix(in oklab, var(--secondary) 10%, transparent), transparent),
              var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,.18);
  min-height: 520px;
  display: grid;
  grid-template-rows: auto 1fr;
}
.graph-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-soft));
  border-radius: 12px 12px 0 0;
}
.legend { display: inline-flex; gap: 8px; align-items: center; font-size: 12px; color: var(--muted); margin-left: 10px; }
.legend-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--text);
}
.legend-branch {
  width: 12px; height: 2px; background: var(--primary);
}
.legend-head {
  width: 10px; height: 10px; border-radius: 50%;
  outline: 2px solid var(--secondary);
  background: transparent;
}
.canvas-wrapper {
  position: relative; overflow: hidden;
}
#graphSvg {
  width: 100%; height: 100%;
  background-image:
    radial-gradient(circle at 25px 25px, rgba(255,255,255,.06) 1px, transparent 0),
    radial-gradient(circle at 25px 25px, rgba(255,255,255,.05) 1px, transparent 0);
  background-size: 50px 50px, 10px 10px;
}

/* Graph nodes and links */
.link {
  stroke: color-mix(in oklab, var(--muted) 25%, var(--text));
  stroke-opacity: .5;
  stroke-width: 2.5;
  fill: none;
  transition: stroke .15s ease;
}
.link.merge {
  stroke: color-mix(in oklab, var(--secondary) 65%, var(--muted));
  stroke-opacity: .7;
  stroke-dasharray: 4 3;
}
.node {
  cursor: pointer;
  transition: transform .08s ease;
}
.node:hover { transform: scale(1.06); }
.node circle {
  fill: var(--text);
  stroke: var(--bg-elev);
  stroke-width: 2;
}
.node .label {
  font-size: 11px;
  fill: var(--muted);
}
.node .branch {
  font-size: 11px;
  fill: var(--muted);
}
.node .head {
  fill: var(--secondary);
  stroke: var(--bg-elev);
  stroke-width: 2.5;
}
.node .diamond {
  fill: var(--secondary);
  opacity: .85;
  stroke: var(--bg-elev);
  stroke-width: 2;
}
.node .id {
  font-size: 10px;
  fill: var(--muted);
}

/* Commit card */
.commit-card {
  position: absolute;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  width: 260px;
  box-shadow: 0 8px 26px rgba(0,0,0,.25);
}
.commit-card h3 {
  margin: 0 0 4px 0;
  font-size: 13px;
}
.commit-card .meta { font-size: 11px; color: var(--muted); margin-bottom: 8px; }
.commit-card .meta .tag {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 6px;
}
.commit-card .message {
  font-size: 12px;
  margin-bottom: 8px;
}
.commit-card .actions { display: flex; gap: 6px; flex-wrap: wrap; }
.commit-card .actions .btn { padding: 6px 8px; font-size: 12px; }

/* Code/blame */
.code {
  background: var(--bg-soft);
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  line-height: 1.4;
  white-space: pre-wrap;
  color: var(--text);
}
.hidden { display: none; }

.app-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
}

/* Responsive */
@media (max-width: 1080px) {
  .app {
    grid-template-columns: 1fr;
  }
  .sidebar { max-height: unset; }
}