:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --sidebar-w: 260px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    min-height: 100vh;
}

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

.sidebar {
    width: var(--sidebar-w);
    background: var(--gray-900);
    color: white;
    padding: 1.5rem 0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 100;
}

.sidebar h1 {
    font-size: 1.25rem;
    padding: 0 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-700);
    margin-bottom: 1rem;
}

.sidebar-section {
    padding: 0.5rem 1.25rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-400);
    margin-top: 1rem;
}

.sidebar a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1.25rem;
    color: var(--gray-300);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.15s;
    cursor: pointer;
}

.sidebar a:hover { background: var(--gray-700); }
.sidebar a.active { background: var(--primary); color: white; }

.sidebar a .icon { width: 1.25rem; text-align: center; }

.mandant-select {
    margin: 0 1rem 0.5rem;
    padding: 0.5rem;
    width: calc(100% - 2rem);
    background: var(--gray-700);
    color: white;
    border: 1px solid var(--gray-600);
    border-radius: 6px;
    font-size: 0.85rem;
}

.main {
    margin-left: var(--sidebar-w);
    flex: 1;
    padding: 2rem;
    min-height: 100vh;
}

/* Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.page-header h2 {
    font-size: 1.5rem;
    color: var(--gray-900);
}

/* Cards */
.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--gray-200);
}

.card-header h3 { font-size: 1.1rem; }

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1.25rem;
}

.stat-card .label {
    font-size: 0.8rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.stat-card .value {
    font-size: 1.75rem;
    font-weight: 700;
    margin-top: 0.25rem;
}

.stat-card .sub {
    font-size: 0.8rem;
    color: var(--gray-400);
    margin-top: 0.25rem;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: none;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.15s;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-outline {
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}
.btn-outline:hover { background: var(--gray-100); }
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.8rem; }
.btn-group { display: flex; gap: 0.5rem; }

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

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

thead th {
    text-align: left;
    padding: 0.6rem 0.75rem;
    background: var(--gray-50);
    border-bottom: 2px solid var(--gray-200);
    font-weight: 600;
    color: var(--gray-600);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    white-space: nowrap;
}

tbody td {
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid var(--gray-100);
}

tbody tr:hover { background: var(--gray-50); }

.text-right { text-align: right; }
.text-center { text-align: center; }
.text-mono { font-family: 'SF Mono', Monaco, monospace; font-size: 0.8rem; }

/* Badges */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-entwurf { background: #fef3c7; color: #92400e; }
.badge-geprueft { background: #d1fae5; color: #065f46; }
.badge-exportiert { background: #dbeafe; color: #1e40af; }

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray-600);
    margin-bottom: 0.25rem;
}

.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 0.85rem;
    transition: border-color 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

select.form-control {
    appearance: auto;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal h3 {
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--gray-200);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-200);
}

/* Upload area */
.upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: 10px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.03);
}

.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.upload-area input[type="file"] { display: none; }
.upload-area .icon { font-size: 2rem; margin-bottom: 0.5rem; color: var(--gray-400); }
.upload-area p { color: var(--gray-500); font-size: 0.85rem; }

/* Toast */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 2000;
}

.toast {
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    color: white;
    font-size: 0.85rem;
    margin-top: 0.5rem;
    animation: slideIn 0.3s ease;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: var(--primary); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar { width: 100%; position: static; }
    .main { margin-left: 0; padding: 1rem; }
    .form-row { grid-template-columns: 1fr; }
    .stats { grid-template-columns: 1fr 1fr; }
}

/* Loading */
.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

/* Status-Indicator */
.status-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 0.4rem;
}
.status-dot.online { background: var(--success); }
.status-dot.offline { background: var(--danger); }