:root {
    color-scheme: light dark;
    --bg: #f4f6f8;
    --card-bg: #ffffff;
    --text: #222;
    --muted: #6b7280;
    --brand: #2563eb;
    --brand-dark: #1d4ed8;
    --link: #2563eb;
    --danger: #dc2626;
    --warn: #d97706;
    --ok: #16a34a;
    --border: #e2e8f0;
    --row-hover: #f8fafc;
    --stat-bg: #f8fafc;
    --input-bg: #ffffff;
    --input-focus-bg: #eaf2ff;
    --flash-bg: #ecfdf5;
    --flash-border: var(--ok);
    --flash-text: #065f46;
    --error-bg: #fef2f2;
    --error-text: #991b1b;
    --badge-ok-bg: #dcfce7;
    --badge-ok-text: #166534;
    --badge-warn-bg: #fef3c7;
    --badge-warn-text: #92400e;
    --badge-danger-bg: #fee2e2;
    --badge-danger-text: #991b1b;
    --overlay-bg: rgba(244, 246, 248, 0.7);
}

/* Dunkles Farbschema: greift automatisch nach Systemeinstellung ... */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg: #14181f;
        --card-bg: #1e242e;
        --text: #e5e7eb;
        --muted: #9aa4b2;
        --brand: #2563eb;
        --brand-dark: #1d4ed8;
        --link: #60a5fa;
        --danger: #f87171;
        --warn: #fbbf24;
        --ok: #4ade80;
        --border: #333c4a;
        --row-hover: #262d39;
        --stat-bg: #262d39;
        --input-bg: #262d39;
        --input-focus-bg: #1d3454;
        --flash-bg: #113023;
        --flash-border: var(--ok);
        --flash-text: #bbf7d0;
        --error-bg: #3a1d1d;
        --error-text: #fecaca;
        --badge-ok-bg: #14532d;
        --badge-ok-text: #bbf7d0;
        --badge-warn-bg: #78350f;
        --badge-warn-text: #fde68a;
        --badge-danger-bg: #7f1d1d;
        --badge-danger-text: #fecaca;
        --overlay-bg: rgba(20, 24, 31, 0.7);
    }
}

/* ... oder wenn der Anwender im Menü explizit "Dunkel" gewählt hat */
:root[data-theme="dark"] {
    --bg: #14181f;
    --card-bg: #1e242e;
    --text: #e5e7eb;
    --muted: #9aa4b2;
    --brand: #2563eb;
    --brand-dark: #1d4ed8;
    --link: #60a5fa;
    --danger: #f87171;
    --warn: #fbbf24;
    --ok: #4ade80;
    --border: #333c4a;
    --row-hover: #262d39;
    --stat-bg: #262d39;
    --input-bg: #262d39;
    --input-focus-bg: #1d3454;
    --flash-bg: #113023;
    --flash-border: var(--ok);
    --flash-text: #bbf7d0;
    --error-bg: #3a1d1d;
    --error-text: #fecaca;
    --badge-ok-bg: #14532d;
    --badge-ok-text: #bbf7d0;
    --badge-warn-bg: #78350f;
    --badge-warn-text: #fde68a;
    --badge-danger-bg: #7f1d1d;
    --badge-danger-text: #fecaca;
    --overlay-bg: rgba(20, 24, 31, 0.7);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 16px;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
    background: var(--brand);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    position: sticky;
    top: 0;
    z-index: 20;
}

.topbar .brand {
    color: #fff;
    font-weight: 700;
    font-size: 1.1rem;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.6rem;
    line-height: 1;
    padding: 0.5rem;
    margin: -0.5rem;
    cursor: pointer;
}

.topbar-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.topnav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.topnav a, .topnav .link-button {
    color: #fff;
    opacity: 0.9;
}

.inline-form { display: inline; }

.theme-select {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 6px;
    padding: 0.3rem 0.4rem;
    font-size: 0.85rem;
}

.theme-select option { color: var(--text); background: var(--card-bg); }

.link-button {
    background: none;
    border: none;
    padding: 0;
    font: inherit;
    cursor: pointer;
}

.content {
    max-width: 720px;
    margin: 0 auto;
    padding: 1rem;
}

.flash {
    background: var(--flash-bg);
    border: 1px solid var(--flash-border);
    color: var(--flash-text);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.card h2 {
    margin-top: 0;
    font-size: 1.05rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card h2 a { font-size: 0.85rem; font-weight: normal; }

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

table.list th, table.list td {
    text-align: left;
    padding: 0.5rem 0.4rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
}

table.list tr:hover td { background: var(--row-hover); }
table.list tr.clickable { cursor: pointer; }

.empty { color: var(--muted); font-style: italic; padding: 0.5rem 0; }

.fab {
    display: inline-block;
    background: var(--brand);
    color: #fff;
    border-radius: 8px;
    padding: 0.4rem 0.9rem;
    font-weight: 600;
}
.fab:hover { background: var(--brand-dark); text-decoration: none; }

form.entry .field {
    margin-bottom: 1rem;
}

form.entry label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

form.entry input[type=text],
form.entry input[type=number],
form.entry input[type=date],
form.entry input[type=datetime-local],
form.entry input[type=password],
form.entry textarea,
form.entry select {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--text);
}

form.entry input[type=text]:focus,
form.entry input[type=number]:focus,
form.entry input[type=date]:focus,
form.entry input[type=datetime-local]:focus,
form.entry input[type=password]:focus,
form.entry textarea:focus,
form.entry select:focus {
    background: var(--input-focus-bg);
    outline: none;
    border-color: var(--brand);
}

form.entry textarea { min-height: 4rem; resize: vertical; }

.btn {
    display: inline-block;
    padding: 0.65rem 1.2rem;
    border-radius: 8px;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }

.btn-danger { background: var(--card-bg); color: var(--danger); border: 1px solid var(--danger); }
.btn-danger:hover { background: var(--error-bg); }

.btn-row { display: flex; gap: 0.75rem; margin-top: 1.5rem; flex-wrap: wrap; }

.checkbox-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.checkbox-row label { display: flex; align-items: center; gap: 0.3rem; font-weight: normal; }

.validation-summary {
    background: var(--error-bg);
    border: 1px solid var(--danger);
    color: var(--error-text);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.field-validation-error { color: var(--danger); font-size: 0.85rem; display: block; margin-top: 0.25rem; }

.badge { display: inline-block; padding: 0.1rem 0.5rem; border-radius: 999px; font-size: 0.8rem; font-weight: 600; }
.badge-ok { background: var(--badge-ok-bg); color: var(--badge-ok-text); }
.badge-warn { background: var(--badge-warn-bg); color: var(--badge-warn-text); }
.badge-danger { background: var(--badge-danger-bg); color: var(--badge-danger-text); }

.login-card { max-width: 360px; margin: 3rem auto; }

.stats-row { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 1rem; }
.stat { flex: 1 1 100px; background: var(--stat-bg); border-radius: 8px; padding: 0.6rem; text-align: center; }
.stat .value { font-size: 1.3rem; font-weight: 700; }
.stat .label { font-size: 0.8rem; color: var(--muted); }

@media print {
    .topbar, .fab, .btn-row, .menu-toggle, .page-loading { display: none !important; }
    .content { max-width: none; }
}

.page-loading {
    position: fixed;
    inset: 0;
    background: var(--overlay-bg);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.page-loading.active { display: flex; }

.page-loading .spinner {
    width: 42px;
    height: 42px;
    border: 4px solid var(--border);
    border-top-color: var(--brand);
    border-radius: 50%;
    animation: page-loading-spin 0.7s linear infinite;
}

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

@media (max-width: 640px) {
    .menu-toggle { display: block; }
    .topnav {
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--brand-dark);
        padding: 0.5rem;
        z-index: 10;
    }
    .topnav.open { display: flex; }
    .topnav a, .topnav .link-button {
        display: block;
        width: 100%;
        box-sizing: border-box;
        padding: 1rem 0.75rem;
        font-size: 1.2rem;
        text-align: left;
        border-radius: 6px;
    }
    .topnav a:active, .topnav .link-button:active {
        background: rgba(255, 255, 255, 0.15);
    }
}