:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --success: #3fb950;
  --warning: #d29922;
  --border: #30363d;
  --shadow: rgba(0, 0, 0, 0.3);
  --gold: #ffd700;
  --silver: #c0c0c0;
  --bronze: #cd7f32;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  text-align: center;
  position: relative;
}

header h1 {
  font-size: 1.75rem;
  margin: 0;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

.back-link {
  display: inline-block;
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.back-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Header Logo */
.header-logo {
  position: absolute;
  top: 50%;
  left: 1.5rem;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
}

.header-logo img {
  height: 56px;
  width: auto;
  transition: transform 0.2s;
}

.header-logo:hover img {
  transform: scale(1.05);
}

/* Header Action Button */
.header-action {
  position: absolute;
  top: 50%;
  right: 1.5rem;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: var(--bg-primary);
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}

.header-action:hover {
  background: var(--accent-hover);
  transform: translateY(-50%) scale(1.05);
}

.header-action svg {
  flex-shrink: 0;
}

/* Documentation Page */
.docs-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.docs-section h2 {
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 1rem;
}

.docs-section h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.docs-section p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.docs-section ul,
.docs-section ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

.docs-section li {
  margin-bottom: 0.5rem;
}

.docs-section code {
  background: var(--bg-tertiary);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  font-size: 0.85em;
  color: var(--accent);
}

.code-block {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  margin: 1rem 0;
  overflow-x: auto;
}

.code-block pre {
  margin: 0;
}

.code-block code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.85rem;
  line-height: 1.5;
}

.example-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

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

.example-table th {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-transform: uppercase;
}

.example-table td {
  color: var(--text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, transform 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

main {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

section {
  margin-bottom: 3rem;
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

/* Stats Bar */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 3rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: bold;
  color: var(--accent);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Leaderboard */
.section-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: -1rem;
  margin-bottom: 1.5rem;
}

.leaderboard {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.leaderboard-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.leaderboard-row:hover {
  transform: translateX(4px);
  box-shadow: 0 4px 12px var(--shadow);
  border-color: var(--accent);
}

.leaderboard-row.rank-gold {
  border-color: var(--gold);
  background: linear-gradient(90deg, rgba(255, 215, 0, 0.1) 0%, var(--bg-secondary) 30%);
}

.leaderboard-row.rank-silver {
  border-color: var(--silver);
  background: linear-gradient(90deg, rgba(192, 192, 192, 0.1) 0%, var(--bg-secondary) 30%);
}

.leaderboard-row.rank-bronze {
  border-color: var(--bronze);
  background: linear-gradient(90deg, rgba(205, 127, 50, 0.1) 0%, var(--bg-secondary) 30%);
}

.leaderboard-rank {
  font-size: 1.5rem;
  font-weight: bold;
  min-width: 3rem;
  text-align: center;
}

.rank-gold .leaderboard-rank {
  color: var(--gold);
}

.rank-silver .leaderboard-rank {
  color: var(--silver);
}

.rank-bronze .leaderboard-rank {
  color: var(--bronze);
}

.leaderboard-team {
  flex: 1;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.leaderboard-score {
  text-align: center;
  min-width: 100px;
}

.leaderboard-score .score-value {
  display: block;
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--accent);
}

.leaderboard-score .score-label {
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.leaderboard-stats {
  display: flex;
  gap: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Teams Grid */
.teams-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.team-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.team-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
  border-color: var(--accent);
}

.team-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.team-card .team-stats {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.team-card .team-stat {
  text-align: center;
}

.team-card .team-stat-value {
  display: block;
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--accent);
}

.team-card .team-stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.team-card .recent-result {
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.team-card .recent-result strong {
  color: var(--text-primary);
}

/* Recent Results */
.recent-results {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.result-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.result-ctf {
  flex: 1;
  min-width: 200px;
}

.result-ctf-name {
  font-weight: 600;
  color: var(--text-primary);
}

.result-ctf-name a {
  color: inherit;
  text-decoration: none;
}

.result-ctf-name a:hover {
  color: var(--accent);
}

.result-ctf-date {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.result-teams {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.result-team {
  text-align: center;
}

.result-team-name {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.result-team-rank {
  font-weight: bold;
  color: var(--success);
}

.result-team-points {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* History Table */
.history-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.history-table th,
.history-table td {
  padding: 1rem 1.5rem;
  text-align: left;
}

.history-table th {
  background: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.history-table tbody tr {
  border-top: 1px solid var(--border);
}

.history-table tbody tr:hover {
  background: var(--bg-tertiary);
}

.history-table a {
  color: var(--accent);
  text-decoration: none;
}

.history-table a:hover {
  text-decoration: underline;
}

.rank-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-weight: bold;
  font-size: 0.9rem;
}

.rank-top10 {
  background: var(--success);
  color: var(--bg-primary);
}

.rank-top50 {
  background: var(--warning);
  color: var(--bg-primary);
}

.rank-other {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Footer */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

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

footer a:hover {
  text-decoration: underline;
}

footer p {
  margin: 0.5rem 0;
}

/* Loading State */
.loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.error {
  text-align: center;
  padding: 2rem;
  color: #f85149;
  background: rgba(248, 81, 73, 0.1);
  border: 1px solid rgba(248, 81, 73, 0.3);
  border-radius: 8px;
}

/* Responsive */
@media (max-width: 768px) {
  .header-logo {
    position: static;
    margin-bottom: 1rem;
  }

  .header-logo img {
    height: 40px;
  }

  .header-action {
    position: static;
    margin-bottom: 1rem;
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
  }

  .header-action span {
    display: none;
  }

  .stats-bar {
    flex-wrap: wrap;
    gap: 1.5rem;
  }

  .stat {
    flex: 1 1 80px;
  }

  .docs-section {
    padding: 1.25rem;
  }

  .leaderboard-row {
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem;
  }

  .leaderboard-rank {
    font-size: 1.25rem;
    min-width: 2.5rem;
  }

  .leaderboard-team {
    flex: 1 1 100%;
    order: -1;
    font-size: 1.1rem;
  }

  .leaderboard-stats {
    flex: 1;
    gap: 1rem;
    font-size: 0.8rem;
  }

  .result-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .history-table th,
  .history-table td {
    padding: 0.75rem 1rem;
  }
}