:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

.page {
    padding: 16px;
    max-width: 1600px;
    margin: 0 auto;
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.header h1 {
    margin: 0;
    font-size: 1.5rem;
}

.actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

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

button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

button:hover {
    background: var(--primary-dark);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 8px;
}

.tab-btn {
    background: transparent;
    color: var(--text-muted);
    border: none;
    padding: 8px 16px;
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.tab-btn:hover {
    background: var(--bg-card);
    color: var(--text);
}

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

.tab-content {
    display: none;
}

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

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid var(--border);
}

.stat-card.large {
    grid-column: span 2;
}

.stat-card h3 {
    margin: 0 0 16px 0;
    font-size: 1rem;
    color: var(--text-muted);
}

.stat-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 12px;
}

.stat-item {
    flex: 1;
    min-width: 80px;
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.stat-item.highlight .stat-value {
    color: var(--success);
}

/* Investigators List */
.investigators-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.investigator-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg);
    border-radius: 6px;
}

.investigator-name {
    font-weight: 500;
}

.investigator-stats {
    display: flex;
    gap: 12px;
    font-size: 0.875rem;
}

.investigator-stats span {
    color: var(--text-muted);
}

.investigator-stats .count {
    color: var(--primary);
    font-weight: 600;
}

.investigator-stats .ready {
    color: var(--success);
}

/* Status Breakdown */
.status-breakdown {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.875rem;
}

.status-row {
    display: flex;
    justify-content: space-between;
    padding: 4px 8px;
    background: var(--bg);
    border-radius: 4px;
}

/* Activity List */
.activity-list {
    max-height: 300px;
    overflow-y: auto;
}

.activity-item {
    display: flex;
    justify-content: space-between;
    padding: 8px;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-case {
    font-weight: 500;
}

.activity-date {
    color: var(--text-muted);
}

.loading {
    color: var(--text-muted);
    font-style: italic;
}

/* Calendar Tab */
#tab-calendar {
    display: none;
}

#tab-calendar.active {
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 16px;
}

#tab-calendar h2 {
    grid-column: span 2;
    margin: 0 0 8px 0;
}

#calendar {
    background: var(--bg-card);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.details {
    background: var(--bg-card);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.details h3 {
    margin: 0 0 12px 0;
}

#details {
    white-space: pre-wrap;
    word-break: break-word;
    background: var(--bg);
    padding: 12px;
    border-radius: 6px;
    font-family: monospace;
    font-size: 0.875rem;
    max-height: 400px;
    overflow-y: auto;
}

/* Monthly Report Tab */
#tab-monthly h2 {
    margin: 0 0 16px 0;
}

.year-selector {
    margin-bottom: 16px;
}

.year-selector select {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
}

.chart-container {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-bottom: 16px;
    max-height: 400px;
}

.monthly-table {
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow-x: auto;
}

.monthly-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.monthly-table th,
.monthly-table td {
    padding: 10px 12px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.monthly-table th {
    background: var(--bg);
    color: var(--text-muted);
    font-weight: 500;
}

.monthly-table tr:last-child td {
    border-bottom: none;
}

.monthly-table tr:hover td {
    background: var(--bg-card-hover);
}

/* FullCalendar overrides for dark theme */
.fc {
    --fc-border-color: var(--border);
    --fc-button-bg-color: var(--primary);
    --fc-button-border-color: var(--primary);
    --fc-button-hover-bg-color: var(--primary-dark);
    --fc-button-hover-border-color: var(--primary-dark);
    --fc-button-active-bg-color: var(--primary-dark);
    --fc-button-active-border-color: var(--primary-dark);
    --fc-event-bg-color: var(--primary);
    --fc-event-border-color: var(--primary);
    --fc-today-bg-color: rgba(37, 99, 235, 0.15);
    --fc-page-bg-color: var(--bg-card);
    --fc-neutral-bg-color: var(--bg);
}

.fc .fc-daygrid-day-number,
.fc .fc-col-header-cell-cushion {
    color: var(--text);
}

.fc .fc-daygrid-day.fc-day-other .fc-daygrid-day-number {
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 980px) {
    .stat-card.large {
        grid-column: span 1;
    }

    #tab-calendar.active {
        grid-template-columns: 1fr;
    }

    #tab-calendar h2 {
        grid-column: span 1;
    }

    .details {
        margin-top: 16px;
    }
}

@media (max-width: 600px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .stat-row {
        flex-direction: column;
    }

    .stat-item {
        text-align: left;
    }
}