:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f1c40f;
    --text-color: #333;
    --bg-color: #f4f7f6;
    --white: #ffffff;
    --border-color: #ddd;
    --card-bg: var(--white);
    --header-bg: var(--white);
    --footer-text: #777;
    --muted-text: #666;
    --input-bg: var(--white);
    --input-border: var(--border-color);
}

[data-theme="dark"] {
    --primary-color: #3498db;
    --primary-dark: #5dade2;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f1c40f;
    --text-color: #e0e0e0;
    --bg-color: #121212;
    --white: #ffffff;
    --border-color: #333;
    --card-bg: #1e1e1e;
    --header-bg: #1e1e1e;
    --footer-text: #aaa;
    --muted-text: #bbb;
    --input-bg: #2c2c2c;
    --input-border: #444;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

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

.main-header {
    background-color: var(--header-bg);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: var(--primary-color);
}

.main-nav ul {
    list-style: none;
    display: flex;
    align-items: center;
}

.main-nav li {
    margin-left: 20px;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
}

.main-nav a:hover {
    color: var(--primary-color);
}

.btn-logout {
    background-color: var(--danger-color);
    color: var(--white) !important;
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 0.9rem;
}

.content {
    min-height: 80vh;
}

.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 4px;
}

.alert-success { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-danger { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert-info { background-color: #d1ecf1; color: #0c5460; border: 1px solid #bee5eb; }

.main-footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    color: var(--footer-text);
    font-size: 0.9rem;
}

.form-container {
    max-width: 400px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    background-color: var(--input-bg);
    color: var(--text-color);
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    transition: background 0.3s;
}

.btn-primary { background-color: var(--primary-color); color: var(--white); }
.dashboard-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.note-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    border-left: 5px solid var(--primary-color);
    display: flex;
    flex-direction: column;
}

.note-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-dark);
}

.note-content {
    flex-grow: 1;
    margin-bottom: 1rem;
    white-space: pre-wrap;
}

.note-meta {
    font-size: 0.85rem;
    color: var(--muted-text);
    border-top: 1px solid var(--border-color);
    padding-top: 0.8rem;
}

.note-meta span {
    display: block;
}

.note-actions {
    margin-top: 1rem;
    display: flex;
    gap: 10px;
}

.btn-small {
    padding: 5px 10px;
    font-size: 0.85rem;
}

.btn-danger { background-color: var(--danger-color); color: var(--white); }
.btn-secondary { background-color: #95a5a6; color: var(--white); }

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    background: var(--border-color);
    color: var(--text-color);
    margin-bottom: 5px;
}

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

/* Responsive Grid-System für Unterseiten */
.split-view {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    margin-top: 2rem;
}

.table-wrapper {
    overflow-x: auto;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th, .data-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: rgba(0,0,0,0.02);
    font-weight: 600;
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 5px;
    display: flex;
    align-items: center;
    color: var(--text-color);
}

.theme-toggle .light-icon,
[data-theme="dark"] .theme-toggle .dark-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .light-icon {
    display: inline;
}

.theme-toggle .dark-icon {
    display: inline;
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .main-header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }

    .main-nav li {
        margin-left: 0;
    }

    .split-view {
        grid-template-columns: 1fr;
    }

    .grid-responsive {
        grid-template-columns: 1fr;
    }

    .dashboard-actions {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
}