:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --accent-padel: #10b981;
  --accent-tennis: #f59e0b;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --success: #10b981;
  --success-light: #d1fae5;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --sidebar-bg: #0f172a;
  --sidebar-text: #cbd5e1;
  --sidebar-active: #1e293b;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 250px;
  background-color: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid #1e293b;
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-header .brand-title {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.5px;
}

.sidebar-nav {
  padding: 16px 12px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--sidebar-text);
  font-weight: 500;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-item:hover, .nav-item.active {
  background-color: var(--sidebar-active);
  color: #ffffff;
  text-decoration: none;
}

.nav-item.active {
  border-left: 3px solid var(--primary);
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid #1e293b;
  font-size: 12px;
  color: #94a3b8;
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

.topbar {
  height: 64px;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topbar-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.page-body {
  padding: 24px;
  flex: 1;
}

/* Cards & Grid */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.grid-kpi {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.kpi-title {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.kpi-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  margin: 6px 0;
}

.kpi-sub {
  font-size: 12px;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}
.btn:hover {
  text-decoration: none;
}

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

.btn-secondary {
  background-color: #ffffff;
  border-color: var(--border);
  color: var(--text-main);
}
.btn-secondary:hover {
  background-color: #f1f5f9;
}

.btn-success {
  background-color: var(--success);
  color: #ffffff;
}

.btn-danger {
  background-color: var(--danger);
  color: #ffffff;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.btn-lg {
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 600;
}

/* Tables */
.table-container {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table th {
  background-color: #f8fafc;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.table tr:hover td {
  background-color: #f8fafc;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-present, .badge-success {
  background-color: var(--success-light);
  color: #065f46;
}

.badge-absent, .badge-danger {
  background-color: var(--danger-light);
  color: #991b1b;
}

.badge-late, .badge-warning {
  background-color: var(--warning-light);
  color: #92400e;
}

.badge-info {
  background-color: var(--primary-light);
  color: #0369a1;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 9px 12px;
  font-size: 14px;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: #ffffff;
  color: var(--text-main);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

/* Alerts Banner */
.alert {
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.alert-success {
  background-color: var(--success-light);
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-error {
  background-color: var(--danger-light);
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* Calendario UI */
.calendar-view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.calendar-grid {
  display: grid;
  grid-template-columns: 80px repeat(7, 1fr);
  border: 1px solid var(--border);
  background: #ffffff;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.calendar-header-day {
  padding: 12px;
  text-align: center;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  border-left: 1px solid var(--border);
  background: #f8fafc;
}

.calendar-hour-cell {
  height: 60px;
  border-bottom: 1px solid #f1f5f9;
  border-left: 1px solid #f1f5f9;
  padding: 4px;
  position: relative;
}

.session-block {
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  color: #ffffff;
  margin-bottom: 6px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.session-block:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.session-time {
  font-size: 11px;
  font-weight: 700;
  opacity: 0.9;
}

.session-title {
  font-size: 13px;
  font-weight: 600;
  margin: 2px 0;
}

.session-coach, .session-court {
  font-size: 11px;
  opacity: 0.85;
}

/* Spots / Plazas UI */
.spots-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.spot-pill {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  background: #f1f5f9;
  color: var(--text-main);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 6px;
}

.spot-pill.empty {
  border-style: dashed;
  color: var(--text-muted);
  background: transparent;
}

/* Attendance Mobile & Tablet Touch-first Screen */
.touch-player-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.touch-player-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.player-avatar-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}

.touch-attendance-actions {
  display: flex;
  gap: 8px;
}

.touch-btn {
  min-width: 80px;
  min-height: 44px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: #ffffff;
  cursor: pointer;
  transition: all 0.15s ease;
}

.touch-btn.active-present {
  background: var(--success);
  border-color: var(--success);
  color: #ffffff;
}

.touch-btn.active-late {
  background: var(--warning);
  border-color: var(--warning);
  color: #ffffff;
}

.touch-btn.active-absent {
  background: var(--danger);
  border-color: var(--danger);
  color: #ffffff;
}

/* Responsive */
@media (max-width: 900px) {
  .app-container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
  }
  .sidebar-nav {
    flex-direction: row;
    overflow-x: auto;
    padding: 8px;
  }
  .touch-attendance-actions {
    flex-wrap: wrap;
  }
}