/* Modernes CSS-Design für Back2Mail */
:root {
    --primary: #3498db;
    --primary-dark: #2980b9;
    --secondary: #95a5a6;
    --success: #27ae60;
    --danger: #e74c3c;
    --warning: #f39c12;
    --info: #3498db;
    --light: #f8f9fa;
    --dark: #2c3e50;
    --gray: #7f8c8d;
    --border: #e1e8ed;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.main-header {
    background: linear-gradient(135deg, var(--dark), #1a2530);
    color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.main-header h1 {
    font-size: 1.8rem;
    font-weight: 600;
    background: linear-gradient(to right, #3498db, #2c3e50);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-header nav {
    display: flex;
    gap: 1.5rem;
}

.main-header nav a {
    color: #ecf0f1;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.main-header nav a:hover {
    background-color: rgba(255,255,255,0.1);
    color: white;
}

/* Hauptinhalt */
.main-content {
    padding: 2rem 0;
}

/* Karten/Styling */
.card {
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 2rem;
    transition: transform 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.card-header {
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.card-header h2 {
    color: var(--dark);
    font-size: 1.5rem;
    font-weight: 600;
}

/* Dashboard Stats */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card h3 {
    color: var(--gray);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), #1d6fa5);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
    background-color: var(--secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: #7f8c8d;
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #219653);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(135deg, #219653, #1e8449);
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #c0392b);
    color: white;
}

.btn-danger:hover {
    background: linear-gradient(135deg, #c0392b, #a93226);
    transform: translateY(-2px);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

/* Formulare */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    border: 1px solid transparent;
}

.alert-error {
    background-color: #fadbd8;
    border-color: #f5b7b1;
    color: #c0392b;
}

.alert-success {
    background-color: #d5f5e3;
    border-color: #abebc6;
    color: #27ae60;
}

.alert-warning {
    background-color: #fdebd0;
    border-color: #f9e79f;
    color: #f39c12;
}

/* Tabellen */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.data-table th,
.data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background-color: var(--dark);
    color: white;
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.data-table tr:hover {
    background-color: #f8f9fa;
}

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

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge-primary {
    background-color: var(--primary);
    color: white;
}

.badge-secondary {
    background-color: var(--secondary);
    color: white;
}

.badge-success {
    background-color: var(--success);
    color: white;
}

/* Status */
.status {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
}

.status-new {
    background-color: #e3f2fd;
    color: #1976d2;
}

.status-contacted {
    background-color: #fff3e0;
    color: #f57c00;
}

.status-interested {
    background-color: #e8f5e9;
    color: #388e3c;
}

.status-customer {
    background-color: #e8f5e9;
    color: #2e7d32;
    font-weight: 600;
}

/* Header Actions */
.header-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.header-actions h2 {
    color: var(--dark);
    font-size: 1.8rem;
    margin: 0;
}

/* Keine Daten */
.no-data {
    text-align: center;
    padding: 3rem;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.no-data p {
    color: var(--gray);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

/* E-Mail Vorschau */
.email-preview {
    margin: 2rem 0;
}

.email-preview h3 {
    color: var(--dark);
    margin-bottom: 1rem;
}

.preview-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.email-body-preview {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
    margin-top: 0.5rem;
    white-space: pre-wrap;
    font-family: monospace;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .main-header nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .header-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .header-actions h2 {
        text-align: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .dashboard-stats {
        grid-template-columns: 1fr;
    }
    
    .data-table {
        font-size: 0.9rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.75rem 0.5rem;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* Loading Spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Footer */
.main-footer {
    background-color: var(--dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

.main-footer p {
    margin: 0;
    opacity: 0.7;
}