:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --danger-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --light-gray: #ecf0f1;
    --border-color: #bdc3c7;
    --text-color: #34495e;
    --page-bg: #f4f7f9;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--page-bg);
    color: var(--text-color);
    margin: 0;
}

.main-container {
    display: flex;
}

nav.sidebar {
    width: 240px;
    background-color: var(--secondary-color);
    color: white;
    min-height: 100vh;
    padding-top: 20px;
}
.sidebar-header {
    text-align: center;
    padding: 0 20px 20px 20px;
    font-size: 1.5em;
    font-weight: bold;
    border-bottom: 1px solid #34495e;
}
.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}
.sidebar ul li a {
    display: block;
    padding: 15px 20px;
    color: white;
    text-decoration: none;
    font-size: 1.1em;
    transition: background-color 0.2s;
}
.sidebar ul li a:hover, .sidebar ul li a.active {
    background-color: #34495e;
}

main.content {
    flex-grow: 1;
    padding: 30px;
    max-width: calc(100% - 240px);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}
h1 {
    margin: 0;
    color: var(--secondary-color);
}

.btn {
    padding: 10px 20px;
    border-radius: 5px;
    border: none;
    color: white;
    text-decoration: none;
    font-size: 1em;
    cursor: pointer;
    transition: opacity 0.2s;
}
.btn:hover { opacity: 0.9; }
.btn-primary { background-color: var(--primary-color); }
.btn-danger { background-color: var(--danger-color); }
.btn-success { background-color: var(--success-color); }

.card {
    background: #fff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    margin-bottom: 25px;
}
.card-header {
    font-size: 1.2em;
    font-weight: bold;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--light-gray);
}

table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    padding: 12px;
    border-bottom: 1px solid var(--light-gray);
    text-align: left;
}
th {
    background-color: #fafafa;
    font-weight: bold;
}
tbody tr:hover { background-color: #f9f9f9; }

/* Formularstile */
form .form-group {
    margin-bottom: 20px;
}
form label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}
form input[type="text"],
form input[type="email"],
form input[type="date"],
form input[type="number"],
form select,
form textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    box-sizing: border-box;
    font-size: 1em;
}
form textarea {
    min-height: 100px;
    resize: vertical;
}
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* Status-Badges */
.status-badge {
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 0.8em;
    font-weight: bold;
    color: white;
    text-align: center;
}
.status-Entwurf { background-color: #7f8c8d; }
.status-Offen { background-color: var(--warning-color); }
.status-Bezahlt { background-color: var(--success-color); }
.status-Storniert { background-color: var(--danger-color); }

/* Rechnungs-Editor */
.editor-container {
    display: flex;
    gap: 30px;
}
.editor-form { flex: 0.8; }
.editor-preview { flex: 1.2; position: sticky; top: 30px; }

#invoice-live-preview {
    border: 1px solid var(--border-color);
    padding: 20px;
    background: #fff;
    min-height: 500px;
}

/* Detailansicht */
.detail-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
}
.detail-card-actions {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--light-gray);
    display: flex;
    gap: 10px;
    align-items: center;
}
.detail-card p {
    margin: 0 0 10px 0;
}
.detail-card p strong {
    display: block;
    color: #7f8c8d;
    font-size: 0.9em;
    margin-bottom: 3px;
}
/* === Login Page Redesign === */

.login-card {
    text-align: center;
    max-width: 360px;
    padding: 50px 40px;
    border: 1px solid #e9ecef;
    border-radius: 12px;
}

.login-card h2 {
    margin: 0 0 25px 0;
    font-size: 1.8em;
    color: var(--secondary-color);
}

.passkey-icon {
    width: 50px;
    height: 50px;
    margin: 0 auto 25px auto;
    color: var(--primary-color);
}

.login-card .btn {
    width: 100%;
    padding: 15px;
    font-size: 1.1em;
    font-weight: bold;
    letter-spacing: 0.5px;
    transition: all 0.2s ease-in-out;
}

.login-card .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
}

.login-card #status {
    min-height: 20px;
    margin-top: 20px;
    color: var(--danger-color);
    font-weight: 500;
}