:root {
  --bg: #f2f5fa;
  --panel: #ffffff;
  --panel-alt: #eef2f8;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --text: #1e293b;
  --text-muted: #64748b;
  --line: #dbe3ee;
  --green: #16a34a;
  --red: #dc2626;
  --radius: 12px;

  --navy: #10214a;
  --navy-2: #1a2f63;
  --gold: #f5b400;
  --gold-dark: #c78f00;

  --g1: #1e3a8a;
  --g2: #16a34a;
  --g3: #ea580c;
  --g4: #7c3aed;
  --g5: #0d9488;
  --g6: #dc2626;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, #e6ecf5 100%);
  color: var(--text);
  min-height: 100vh;
}

.app-header {
  padding: 28px 20px 0;
  text-align: center;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%);
  border-bottom: 4px solid var(--gold);
  box-shadow: 0 4px 16px rgba(16, 33, 74, 0.25);
}

.school-name {
  margin: 0 0 6px;
  color: var(--gold);
  font-weight: 700;
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  letter-spacing: 0.3px;
}

.app-header h1 {
  margin: 0 0 16px;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  color: #ffffff;
  letter-spacing: 0.5px;
}

.school-crest {
  width: 88px;
  height: 88px;
  object-fit: contain;
  border-radius: 50%;
  border: 3px solid var(--gold);
  box-shadow: 0 4px 14px rgba(245, 180, 0, 0.35);
  margin-bottom: 10px;
}

.school-ig {
  margin: -8px 0 14px;
  font-size: 0.95rem;
}

.school-ig a {
  color: #c9d6f0;
  text-decoration: none;
  transition: color 0.2s;
}

.school-ig a:hover {
  color: var(--gold);
  text-decoration: underline;
}

.tabs {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 0;
}

.tab-btn {
  background: none;
  border: none;
  color: #a9bce0;
  font-size: 1rem;
  padding: 12px 18px;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.tab-btn:hover { color: #ffffff; }

.tab-btn.active {
  color: var(--gold);
  border-bottom-color: var(--gold);
  font-weight: 600;
}

main {
  max-width: 1600px;
  margin: 0 auto;
  padding: 28px 24px 80px;
  width: 100%;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

h2 { margin-top: 0; }
.muted { color: var(--text-muted); }

.card {
  background: var(--panel);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--line);
}

.form-card { margin-bottom: 24px; }

.form-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.form-row label { color: var(--text-muted); }

input[type="number"] {
  width: 80px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel-alt);
  color: var(--text);
  font-size: 1rem;
}

input[type="number"]:focus { outline: 2px solid var(--accent); }

.btn {
  padding: 10px 16px;
  border-radius: 8px;
  border: none;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
  transition: opacity 0.15s, transform 0.1s;
}

.btn:hover:not(:disabled) { opacity: 0.9; }
.btn:active:not(:disabled) { transform: scale(0.98); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary { background: var(--accent); color: #ffffff; }
.btn-secondary { background: var(--panel-alt); color: var(--text); border: 1px solid var(--line); }
.btn-danger { background: var(--red); color: white; }
.btn-small { padding: 6px 12px; font-size: 0.85rem; }

.warning {
  background: rgba(214, 69, 69, 0.15);
  border: 1px solid var(--red);
  padding: 10px 14px;
  border-radius: 8px;
  margin: 14px 0 0;
}

.hidden { display: none !important; }

.groups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.group-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.group-box h3 {
  margin: 0;
  background: var(--accent);
  color: #ffffff;
  padding: 10px 14px;
  font-size: 1.05rem;
}

.group-color-0 h3 { background: var(--g1); }
.group-color-1 h3 { background: var(--g2); }
.group-color-2 h3 { background: var(--g3); }
.group-color-3 h3 { background: var(--g4); }
.group-color-4 h3 { background: var(--g5); }
.group-color-5 h3 { background: var(--g6); }

.group-box ul {
  list-style: none;
  margin: 0;
  padding: 10px 14px;
}

.group-box li {
  padding: 5px 0;
  border-bottom: 1px solid var(--line);
}

.group-box li:last-child { border-bottom: none; }

.admin-zone {
  margin-top: 32px;
  background: var(--panel-alt);
  border-radius: var(--radius);
  padding: 14px 18px;
  border: 1px dashed var(--line);
}

.admin-zone summary { cursor: pointer; font-weight: 600; color: var(--text-muted); }
.admin-zone .btn { margin-top: 10px; }

.groups-stage {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
  gap: 24px;
  align-items: start;
}

.group-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px;
}

.group-card h3 { margin-top: 0; color: var(--accent); }

.group-card.group-color-0 { border-top-color: var(--g1); }
.group-card.group-color-0 h3 { color: var(--g1); }
.group-card.group-color-1 { border-top-color: var(--g2); }
.group-card.group-color-1 h3 { color: var(--g2); }
.group-card.group-color-2 { border-top-color: var(--g3); }
.group-card.group-color-2 h3 { color: var(--g3); }
.group-card.group-color-3 { border-top-color: var(--g4); }
.group-card.group-color-3 h3 { color: var(--g4); }
.group-card.group-color-4 { border-top-color: var(--g5); }
.group-card.group-color-4 h3 { color: var(--g5); }
.group-card.group-color-5 { border-top-color: var(--g6); }
.group-card.group-color-5 h3 { color: var(--g6); }

table.standings {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

table.standings th, table.standings td {
  padding: 6px 8px;
  text-align: center;
  border-bottom: 1px solid var(--line);
}

table.standings th:first-child, table.standings td:first-child { text-align: left; }
table.standings th { color: var(--text-muted); font-weight: 600; }
table.standings tr:nth-child(-n+2) td:first-child { color: var(--accent); font-weight: 600; }

.matches-list { display: flex; flex-direction: column; gap: 8px; }

.match-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--panel-alt);
  border-radius: 8px;
  padding: 8px 12px;
  flex-wrap: wrap;
}

.match-row .team-name {
  flex: 1;
  min-width: 90px;
}

.match-row .team-name.right { text-align: right; }

.match-row input[type="number"] {
  width: 52px;
}

.match-row.played { border-left: 3px solid var(--green); }

.selector-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 10px;
  margin: 16px 0;
}

.selector-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
}

.selector-item input { width: 18px; height: 18px; }

.selector-item .rank-badge {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: auto;
}

.selector-item.auto {
  background: #eff6ff;
  border-color: var(--accent);
}

.selector-item.auto .rank-badge {
  color: var(--accent-dark);
  font-weight: 600;
}

.selector-counter {
  font-weight: 600;
  color: var(--accent);
  margin: 10px 0;
}

.bracket {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  padding-bottom: 16px;
  justify-content: space-between;
  min-width: 0;
}

.bracket-round {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  gap: 20px;
  min-width: 0;
  flex: 1;
}

.bracket-round h4 {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.ko-match {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
}

.ko-team-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0;
  gap: 8px;
}

.ko-team-row.winner {
  color: var(--green);
  font-weight: 700;
  background: #eafaf0;
  border-radius: 6px;
  padding: 4px 6px;
}

.ko-match select {
  width: 100%;
  margin-top: 8px;
  padding: 6px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--panel-alt);
  color: var(--text);
}

.ko-match .score-inputs {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 6px;
}

.champion-banner {
  text-align: center;
  padding: 60px 20px;
  background: radial-gradient(circle at center, #fff8e6, var(--bg));
  border-radius: var(--radius);
  border: 2px solid var(--gold);
}

.champion-banner .trophy { font-size: 5rem; }
.champion-banner h2 { font-size: 2.4rem; color: var(--gold-dark); margin: 10px 0; }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--panel-alt);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 12px 20px;
  border-radius: 8px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  z-index: 999;
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { border-color: var(--red); }

@media (max-width: 900px) {
  main { padding: 20px 14px 70px; }
  .groups-stage { grid-template-columns: 1fr; }
  .bracket-round { min-width: 220px; flex: 0 0 220px; }
}

@media (max-width: 600px) {
  .match-row { justify-content: space-between; }
  .match-row .team-name { min-width: 60px; }
  .app-header { padding: 18px 12px 0; }
  .school-crest { width: 68px; height: 68px; }
  .tab-btn { padding: 10px 10px; font-size: 0.9rem; }
  .form-row { flex-direction: column; align-items: stretch; }
  .form-row input[type="number"] { width: 100%; }
  .groups-grid { grid-template-columns: 1fr 1fr; }
  table.standings { font-size: 0.8rem; }
  table.standings th, table.standings td { padding: 4px 4px; }
  .selector-item { padding: 8px 10px; }
  .bracket-round { min-width: 200px; flex: 0 0 200px; }
}

@media (max-width: 400px) {
  .groups-grid { grid-template-columns: 1fr; }
  .tab-btn { font-size: 0.82rem; padding: 8px 6px; }
}