:root {
    --bg-main: #f8fafc;
    --bg-panel: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #d97706;
    --sidebar-bg: #0f172a;
    --sidebar-text: #f8fafc;
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
}

/* Układ główny aplikacji */
.app {
    display: flex;
    min-height: 100vh;
}

/* Panel boczny (Sidebar) */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    flex-shrink: 0;
}

.sidebar h2 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.5px;
    padding-left: 8px;
    color: #38bdf8;
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar nav a {
    color: #94a3b8;
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.sidebar nav a:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--sidebar-text);
}

.sidebar nav a.active {
    background-color: var(--primary);
    color: white;
}

.sidebar hr {
    border: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin: 12px 0;
}

/* Obszar roboczy content */
.content {
    flex-grow: 1;
    padding: 32px;
    overflow-y: auto;
}

.content h1 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 24px;
}

/* Siatka i Panele */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 24px;
}

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.panel.full-width {
    grid-column: 1 / -1;
}

.panel h2 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-main);
}

/* Tabele systemowe */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 8px;
    font-size: 14px;
}

th {
    background-color: #f8fafc;
    color: var(--text-muted);
    font-weight: 600;
    text-align: left;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}

td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-main);
}

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

/* Przyciski */
.btn-system {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-primary { background-color: var(--primary); color: white; }
.btn-primary:hover { background-color: var(--primary-hover); }
.btn-secondary { background-color: #f1f5f9; color: #334155; border-color: #cbd5e1; }
.btn-secondary:hover { background-color: #e2e8f0; }
.btn-success { background-color: var(--success); color: white; }
.btn-success:hover { background-color: #15803d; }
.btn-danger { background-color: var(--danger); color: white; }
.btn-danger:hover { background-color: #b91c1c; }

/* Statusy i pigułki */
.status-pill {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 12px;
    font-weight: 600;
}
.status-ok { background-color: #dcfce7; color: #15803d; }
.status-alert { background-color: #fef3c7; color: #92400e; }
.status-error { background-color: #fee2e2; color: #b91c1c; }

/* Popupy (Modale) */
.popup-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.popup-window {
    background: var(--bg-panel);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
    max-height: 90vh;
    overflow-y: auto;
}