:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
    --border: #334155;
    --accent: #22d3ee;
    --white-piece: #e2e8f0;
    --black-piece: #475569;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    justify-content: center;
}

.app-container {
    width: 100%;
    max-width: 800px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}

.chess-icon {
    font-size: 2rem;
}

/* Buttons */
button {
    cursor: pointer;
    border: none;
    border-radius: 8px;
    padding: 10px 16px;
    font-weight: 600;
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-dim);
}

.btn-secondary:hover {
    border-color: var(--text-main);
    color: var(--text-main);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    background: var(--card-bg);
    padding: 5px;
    border-radius: 12px;
}

.tab-btn {
    flex: 1;
    background: transparent;
    color: var(--text-dim);
    padding: 10px;
}

.tab-btn.active {
    background: var(--bg-color);
    color: var(--text-main);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Content */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.panel {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

input {
    background: var(--bg-color);
    border: 1px solid var(--border);
    color: white;
    padding: 10px;
    border-radius: 8px;
    flex: 1;
}

#player-list {
    list-style: none;
    margin-top: 10px;
}

#player-list li {
    background: var(--card-bg);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid transparent;
}

#player-list li:hover {
    border-color: var(--primary);
}

/* Pairings */
.action-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pairings-grid {
    display: grid;
    gap: 10px;
}

.match-card {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 10px;
    display: flex;
    justify-content:space-between;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 15px;
}

.player-side {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
}

.player-side.white::before {
    content: '';
    width: 12px;
    height: 12px;
    background: var(--white-piece);
    border-radius: 50%;
    display: inline-block;
}

.player-side.black {
    justify-content: flex-end;
    text-align: right;
}

.player-side.black::after {
    content: '';
    width: 12px;
    height: 12px;
    background: var(--black-piece);
    border-radius: 50%;
    display: inline-block;
}

.result-controls {
    display: flex;
    gap: 5px;
}

.btn-result {
    padding: 5px 10px;
    font-size: 0.8rem;
    background: var(--bg-color);
    color: var(--text-dim);
}

.btn-danger {
  background: #ef4444;
  color: #fff;
  border: none;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
}

.btn-sm {
  font-size: 12px;
  padding: 4px 8px;
}

.btn-danger:hover {
  background: #dc2626;
}


.btn-result.selected {
    background: var(--primary);
    color: white;
}

/* Standings */
.standings-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
}

.standings-table th,
.standings-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.standings-table th {
    background: rgba(0, 0, 0, 0.2);
    font-weight: 600;
    color: var(--text-dim);
}

/* columnas dinámicas de rondas */
.standings-table th.round-col,
.standings-table td.round-col {
    text-align: center;
    width: 60px;
}

/* total destacado */
.standings-table td.total-points {
    font-weight: 700;
    color: var(--accent);
}

.badge {
    background: var(--border);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    text-transform: uppercase;
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-dim);
    font-style: italic;
}

/* Mensaje de inicio */
.start-message {
    background: var(--accent);
    color: var(--bg-color);
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    margin-bottom: 15px;
    display: none; /* se mostrará con JS */
}