:root {
  --bg: #0d1117;
  --card-bg: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #3fb950;
  --accent-2: #7c3aed;
  --danger: #f85149;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --card-bg: #ffffff;
    --border: #d0d7de;
    --text: #1f2328;
    --text-dim: #57606a;
    --accent: #1a7f37;
    --accent-2: #6639ba;
    --danger: #cf222e;
  }
}

* { box-sizing: border-box; }

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

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-header h1 {
  font-size: 1.25rem;
  margin: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-header nav a {
  color: var(--text-dim);
  text-decoration: none;
  margin-left: 1.25rem;
  font-weight: 600;
  padding-bottom: 0.25rem;
}

.page-header nav a.active,
.page-header nav a:hover {
  color: var(--text);
  border-bottom: 2px solid var(--accent);
}

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}

.container-wide {
  max-width: 1100px;
}

.rules-card, .form-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.rules-card h2, .form-card h2 {
  margin-top: 0;
}

.deadline-note {
  font-weight: 600;
  color: var(--accent-2);
}

.hint {
  color: var(--text-dim);
  font-size: 0.9rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

input[type="text"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}

.name-row {
  display: flex;
  gap: 0.5rem;
  align-items: stretch;
  margin-bottom: 1rem;
}

.name-row input[type="text"] {
  margin-bottom: 0;
}

.secondary-btn {
  flex-shrink: 0;
  padding: 0 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
}

.secondary-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.team-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.team-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 0.4rem;
  background: var(--bg);
  cursor: grab;
}

.team-row.dragging {
  opacity: 0.4;
}

.team-row .pos {
  font-weight: 700;
  color: var(--text-dim);
  width: 1.75rem;
  text-align: right;
  flex-shrink: 0;
}

.team-row .team-name {
  flex: 1;
  font-weight: 600;
}

.team-row .move-btns {
  display: flex;
  gap: 0.25rem;
}

.team-row button {
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  border-radius: 6px;
  width: 2rem;
  height: 2rem;
  font-size: 1rem;
  cursor: pointer;
}

.team-row button:disabled {
  opacity: 0.3;
  cursor: default;
}

.primary-btn {
  width: 100%;
  padding: 0.75rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  margin-top: 0.75rem;
}

.primary-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.status-msg {
  min-height: 1.2rem;
  font-weight: 600;
}

.status-msg.error { color: var(--danger); }
.status-msg.success { color: var(--accent); }

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
}

.leaderboard-table th, .leaderboard-table td {
  text-align: left;
  padding: 0.5rem 0.5rem;
  border-bottom: 1px solid var(--border);
}

.leaderboard-table th {
  color: var(--text-dim);
  font-size: 0.85rem;
  text-transform: uppercase;
}

.edit-link {
  color: var(--accent-2);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.edit-link:hover {
  text-decoration: underline;
}

.table-scroll {
  overflow-x: auto;
}

.compare-table {
  border-collapse: collapse;
  white-space: nowrap;
}

.compare-table th, .compare-table td {
  text-align: left;
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.compare-table th {
  color: var(--text-dim);
  font-size: 0.85rem;
  position: sticky;
  top: 0;
  background: var(--card-bg);
}

.compare-table .pos-col {
  position: sticky;
  left: 0;
  background: var(--card-bg);
  font-weight: 700;
  color: var(--text-dim);
  z-index: 1;
}