*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface2: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --error-bg: #3d1a1a;
  --error-border: #f85149;
  --error-text: #f85149;
  --bar-bg: #21262d;
  --radius: 10px;
  --radius-sm: 6px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* ─── Header ─── */
header {
  padding: 2rem 1.5rem 1.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--accent);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.tagline {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ─── Main ─── */
main {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 2rem auto;
  padding: 0 1.25rem;
}

/* ─── Input section ─── */
.input-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.optional {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-left: 0.4rem;
}

input[type="text"],
input[type="password"] {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.85rem;
  color: var(--text);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

input[type="text"]:focus,
input[type="password"]:focus {
  border-color: var(--accent);
}

input::placeholder { color: var(--text-muted); }

button#fetch-btn {
  align-self: flex-start;
  background: var(--accent);
  color: #0d1117;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.6rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

button#fetch-btn:hover { background: var(--accent-hover); }
button#fetch-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ─── Error box ─── */
.error-box {
  margin-top: 1rem;
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  color: var(--error-text);
  font-size: 0.9rem;
}

.hidden { display: none !important; }

/* ─── Results ─── */
.results { margin-top: 2rem; }

/* Stats bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.stat-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Chart + search */
.chart-and-search {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  align-items: start;
}

.chart-wrapper {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  max-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chart-wrapper canvas {
  max-height: 340px;
}

/* Search panel */
.search-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.search-panel label {
  font-size: 0.875rem;
  font-weight: 600;
}

.user-highlight {
  margin-top: 0.5rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.user-highlight .uh-avatar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.8rem;
}

.user-highlight img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--border);
}

.user-highlight .uh-name {
  font-weight: 700;
  font-size: 1rem;
}

.user-highlight .uh-link {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.user-highlight .uh-stats {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.875rem;
}

.uh-stat-row {
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
}

.uh-stat-row span:last-child {
  color: var(--text);
  font-weight: 600;
}

.user-highlight .not-found {
  color: var(--text-muted);
  font-size: 0.875rem;
  text-align: center;
  padding: 0.5rem 0;
}

/* List */
.list-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.list-section h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
}

.list-header {
  display: grid;
  grid-template-columns: 40px 1fr 90px 80px;
  gap: 0.5rem;
  padding: 0 0.5rem 0.5rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
}

#contrib-list {
  list-style: none;
  max-height: 480px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

#contrib-list::-webkit-scrollbar { width: 6px; }
#contrib-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.contrib-item {
  display: grid;
  grid-template-columns: 40px 1fr 90px 80px;
  gap: 0.5rem;
  align-items: center;
  padding: 0.6rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}

.contrib-item:hover { background: var(--surface2); }

.contrib-item.highlighted {
  background: rgba(88, 166, 255, 0.12);
  outline: 1px solid var(--accent);
}

.contrib-rank {
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
}

.contrib-user {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
}

.contrib-user img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  flex-shrink: 0;
}

.contrib-user a {
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.contrib-commits {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: right;
}

.contrib-pct-cell {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.contrib-pct-label {
  font-size: 0.8rem;
  text-align: right;
  font-weight: 600;
  color: var(--text);
}

.contrib-bar {
  height: 5px;
  background: var(--bar-bg);
  border-radius: 3px;
  overflow: hidden;
}

.contrib-bar-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--accent);
}

/* Footer */
footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 700px) {
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .chart-and-search { grid-template-columns: 1fr; }
  .chart-wrapper { max-height: 280px; }
  .list-header,
  .contrib-item {
    grid-template-columns: 32px 1fr 70px 64px;
  }
}

@media (max-width: 450px) {
  .stats-bar { grid-template-columns: 1fr 1fr; }
}