:root {
    --primary: #1e40af;
    --primary-light: #3b82f6;
    --accent: #f59e0b;
    --accent-dark: #d97706;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #06b6d4;
    --bg: #0f172a;
    --bg2: #1e293b;
    --bg3: #334155;
    --card: #1e293b;
    --border: #334155;
    --text: #f1f5f9;
    --text2: #94a3b8;
    --text3: #64748b;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }
a { color: inherit; text-decoration: none; }

/* Layout */
.layout { display: flex; min-height: 100vh; }
.sidebar { width: 240px; background: var(--bg2); border-right: 1px solid var(--border); display: flex; flex-direction: column; position: fixed; top: 0; left: 0; height: 100vh; z-index: 100; }
.sidebar-logo { padding: 24px 20px 16px; border-bottom: 1px solid var(--border); }
.sidebar-logo h1 { font-size: 1.1rem; font-weight: 700; color: var(--accent); }
.sidebar-logo p { font-size: 0.72rem; color: var(--text3); margin-top: 2px; }
.sidebar-nav { flex: 1; padding: 12px 0; overflow-y: auto; }
.nav-group { padding: 8px 16px 4px; font-size: 0.65rem; font-weight: 700; color: var(--text3); text-transform: uppercase; letter-spacing: .08em; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 20px; font-size: 0.875rem; color: var(--text2); cursor: pointer; transition: all .15s; border-left: 3px solid transparent; }
.nav-item:hover { background: var(--bg3); color: var(--text); }
.nav-item.active { background: rgba(59,130,246,.15); color: var(--primary-light); border-left-color: var(--primary-light); }
.nav-item .icon { font-size: 1.1rem; width: 22px; text-align: center; }
.sidebar-footer { padding: 16px; border-top: 1px solid var(--border); font-size: 0.75rem; color: var(--text3); }

.main { margin-left: 240px; flex: 1; display: flex; flex-direction: column; min-height: 100vh; }
.topbar { background: var(--bg2); border-bottom: 1px solid var(--border); padding: 0 28px; height: 60px; display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 50; }
.topbar-title { font-size: 1rem; font-weight: 600; }
.topbar-actions { display: flex; gap: 10px; align-items: center; }
.content { padding: 28px; flex: 1; }

/* Cards */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.card-title { font-size: 0.95rem; font-weight: 600; }
.card-icon { font-size: 1.3rem; }

/* Stats grid */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 28px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; display: flex; gap: 14px; align-items: center; }
.stat-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.4rem; flex-shrink: 0; }
.stat-icon.blue { background: rgba(59,130,246,.15); }
.stat-icon.amber { background: rgba(245,158,11,.15); }
.stat-icon.green { background: rgba(16,185,129,.15); }
.stat-icon.red { background: rgba(239,68,68,.15); }
.stat-icon.cyan { background: rgba(6,182,212,.15); }
.stat-label { font-size: 0.75rem; color: var(--text3); }
.stat-value { font-size: 1.6rem; font-weight: 700; line-height: 1.2; }
.stat-sub { font-size: 0.72rem; color: var(--text3); margin-top: 2px; }

/* Tables */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
th { padding: 10px 14px; text-align: left; font-size: 0.72rem; font-weight: 700; color: var(--text3); text-transform: uppercase; letter-spacing: .06em; border-bottom: 1px solid var(--border); }
td { padding: 12px 14px; border-bottom: 1px solid rgba(51,65,85,.5); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(51,65,85,.3); }

/* Badges */
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 99px; font-size: 0.72rem; font-weight: 600; }
.badge-blue { background: rgba(59,130,246,.15); color: #93c5fd; }
.badge-green { background: rgba(16,185,129,.15); color: #6ee7b7; }
.badge-amber { background: rgba(245,158,11,.15); color: #fcd34d; }
.badge-red { background: rgba(239,68,68,.15); color: #fca5a5; }
.badge-gray { background: rgba(100,116,139,.15); color: var(--text2); }
.badge-cyan { background: rgba(6,182,212,.15); color: #67e8f9; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px; border-radius: 8px; font-size: 0.875rem; font-weight: 500; cursor: pointer; border: none; transition: all .15s; }
.btn-primary { background: var(--primary-light); color: #fff; }
.btn-primary:hover { background: var(--primary); }
.btn-accent { background: var(--accent); color: #000; }
.btn-accent:hover { background: var(--accent-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; }
.btn-ghost { background: transparent; color: var(--text2); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--bg3); color: var(--text); }
.btn-sm { padding: 5px 11px; font-size: 0.8rem; border-radius: 6px; }
.btn-icon { padding: 6px 8px; border-radius: 6px; background: transparent; border: 1px solid var(--border); color: var(--text2); cursor: pointer; font-size: 0.9rem; transition: all .15s; }
.btn-icon:hover { background: var(--bg3); color: var(--text); }

/* Forms */
.form-grid { display: grid; gap: 16px; }
.form-grid-2 { grid-template-columns: 1fr 1fr; }
.form-grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
label { font-size: 0.8rem; color: var(--text2); font-weight: 500; }
input, select, textarea { background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; padding: 9px 12px; color: var(--text); font-size: 0.875rem; width: 100%; outline: none; transition: border-color .15s; }
input:focus, select:focus, textarea:focus { border-color: var(--primary-light); }
input::placeholder { color: var(--text3); }
textarea { resize: vertical; min-height: 80px; }
.form-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 8px; }

/* Modal */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.7); z-index: 200; align-items: center; justify-content: center; padding: 16px; }
.modal-overlay.open { display: flex; }
.modal { background: var(--bg2); border: 1px solid var(--border); border-radius: 16px; width: 100%; max-width: 520px; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow); }
.modal-header { padding: 20px 24px 0; display: flex; align-items: center; justify-content: space-between; }
.modal-title { font-size: 1rem; font-weight: 700; }
.modal-body { padding: 20px 24px 24px; }
.modal-close { background: none; border: none; color: var(--text3); cursor: pointer; font-size: 1.2rem; padding: 4px; border-radius: 6px; }
.modal-close:hover { color: var(--text); background: var(--bg3); }

/* Avatar */
.avatar { width: 36px; height: 36px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; font-size: 0.9rem; font-weight: 700; color: #fff; flex-shrink: 0; }

/* Rank medals */
.rank-1 { color: #fbbf24; }
.rank-2 { color: #94a3b8; }
.rank-3 { color: #cd7c2f; }
.rank-num { font-size: 1rem; font-weight: 700; }

/* Progress bar */
.progress { background: var(--bg3); border-radius: 99px; height: 6px; overflow: hidden; }
.progress-bar { height: 100%; border-radius: 99px; background: var(--primary-light); }

/* Alert */
.alert { padding: 12px 16px; border-radius: 8px; font-size: 0.875rem; margin-bottom: 16px; }
.alert-success { background: rgba(16,185,129,.1); border: 1px solid rgba(16,185,129,.3); color: #6ee7b7; }
.alert-danger { background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.3); color: #fca5a5; }
.alert-info { background: rgba(6,182,212,.1); border: 1px solid rgba(6,182,212,.3); color: #67e8f9; }
.alert-warning { background: rgba(245,158,11,.1); border: 1px solid rgba(245,158,11,.3); color: #fcd34d; }

/* Bracket */
.bracket-container { overflow-x: auto; padding-bottom: 12px; }
.bracket { display: flex; gap: 40px; align-items: flex-start; }
.bracket-round { display: flex; flex-direction: column; gap: 20px; }
.bracket-round-title { font-size: 0.72rem; font-weight: 700; color: var(--text3); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 8px; text-align: center; }
.match-card { background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; width: 200px; overflow: hidden; }
.match-player { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; gap: 8px; font-size: 0.82rem; }
.match-player:first-child { border-bottom: 1px solid var(--border); }
.match-player.winner { background: rgba(16,185,129,.1); color: #6ee7b7; font-weight: 600; }
.match-player.loser { color: var(--text3); }
.match-score { font-weight: 700; font-size: 1rem; min-width: 28px; text-align: right; }
.match-pending { padding: 10px 12px; font-size: 0.8rem; color: var(--text3); text-align: center; }

/* Score input grid */
.scores-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); gap: 8px; }
.score-box { background: var(--bg3); border: 1px solid var(--border); border-radius: 8px; padding: 8px; text-align: center; }
.score-box .score-num { font-size: 1.3rem; font-weight: 700; color: var(--accent); }
.score-box .score-lbl { font-size: 0.65rem; color: var(--text3); }

/* Print */
@media print {
    .sidebar, .topbar, .btn, .modal-overlay { display: none !important; }
    .main { margin-left: 0 !important; }
    body { background: #fff; color: #000; }
    .card { border: 1px solid #ccc; }
    th, td { color: #000 !important; border-color: #ccc !important; }
}

/* Hamburger (hidden on desktop) */
.hamburger { display: none; background: none; border: none; color: var(--text); font-size: 1.6rem; cursor: pointer; padding: 0 12px 0 0; line-height: 1; }
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.55); z-index: 99; }
.sidebar-overlay.open { display: block; }

/* Responsive */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); transition: transform .25s ease; }
    .sidebar.open { transform: translateX(0); box-shadow: 0 0 40px rgba(0,0,0,.5); }
    .main { margin-left: 0; }
    .hamburger { display: inline-block; }
    .form-grid-2, .form-grid-3 { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .topbar { padding: 0 16px; }
    .content { padding: 16px !important; }
    .topbar-actions .btn-sm { padding: 6px 8px; font-size: .72rem; }
}
@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
}

.page-header { margin-bottom: 24px; }
.page-header h2 { font-size: 1.3rem; font-weight: 700; }
.page-header p { font-size: 0.85rem; color: var(--text3); margin-top: 4px; }
.section-gap { margin-bottom: 24px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--text3); }
.font-bold { font-weight: 700; }
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.full-width { grid-column: 1 / -1; }
.divider { border: none; border-top: 1px solid var(--border); margin: 16px 0; }