/* Globale Variablen für Light/Dark Mode */
:root[data-theme="light"] {
    --bg-color: #f8fafc;
    --text-color: #0f172a;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --input-bg: #ffffff;
}

:root[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --card-bg: #1e293b;
    --border-color: #334155;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --input-bg: #0f172a;
}

/* Reset & Basis */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: system-ui, -apple-system, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
}

.container {
    width: 100%;
    max-width: 900px;
}

/* Navbar / Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    margin-right: 1.5rem;
    transition: color 0.2s;
}

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

/* Sun/Moon Toggle */
.theme-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    width: 40px;
    height: 40px;
    position: relative;
    outline: none;
    border-radius: 50%;
}
.theme-toggle:hover { background: var(--border-color); }
.icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    transition: all 0.5s ease;
    position: absolute;
    top: 8px;
    left: 8px;
}
:root[data-theme="dark"] .icon {
    background-color: transparent;
    box-shadow: inset -8px -6px 0 0 #f8fafc;
    transform: rotate(-20deg);
}
:root[data-theme="light"] .icon {
    background-color: #f59e0b;
    box-shadow: none;
    transform: scale(1);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    transition: background-color 0.3s, border-color 0.3s;
}

.card h2, .card h3, .card legend {
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-color);
}

/* Formulare */
fieldset {
    border: none;
    margin: 0;
    padding: 0;
}
.form-group {
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
}
.form-group.row {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
}
label {
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}
input[type="text"], input[type="password"], input[type="number"], select {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}
input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
}

/* Buttons */
button.btn {
    background-color: var(--primary);
    color: #fff;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}
button.btn:hover { background-color: var(--primary-hover); }
button.btn:active { transform: scale(0.98); }

/* Tabellen */
.table-container {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}
th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background-color: rgba(128, 128, 128, 0.05); }

/* Alerts / Messages */
.alert {
    background-color: #10b981;
    color: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

/* Grid-Layout für Settings */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}