:root {
    --blau:        #0f3d8f;
    --blau-dunkel: #0a2d6b;
    --blau-hell:   #eef2f9;
    --gruen:       #2e7d32;
    --gruen-hell:  #edf5ee;
    --grau:        #6b7280;
    --grau-dunkel: #374151;
    --rot:         #b91c1c;
    --rand:        #e5e7eb;
    --gelb:        #fef9c3;
    --gelb-rand:   #fde047;
    --bg:          #f4f6fb;
    --text:        #1f2937;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { height: 100%; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

/* --- Topbar mit Logo --------------------------------------------------- */
.topbar {
    background: #fff;
    border-bottom: 1px solid var(--rand);
    padding: 14px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}
.topbar .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--blau);
}
.topbar .brand img {
    height: 32px;
    width: auto;
    display: block;
    image-rendering: -webkit-optimize-contrast;
}
.topbar-nav {
    display: flex;
    align-items: center;
    gap: 18px;
}
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--gruen);
    font-weight: 600;
    font-size: .9rem;
}
.status-badge::before {
    content: "";
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--gruen);
}
.link-sekundaer {
    color: var(--grau);
    font-size: .9rem;
    text-decoration: none;
}
.link-sekundaer:hover { color: var(--grau-dunkel); text-decoration: underline; }

/* --- Seiten-Layout ---------------------------------------------------- */
main {
    padding: 32px 20px;
}
.karte {
    max-width: 480px;
    margin: 0 auto;
    background: #fff;
    border: 1px solid var(--rand);
    border-radius: 16px;
    padding: 32px;
    box-shadow: 0 4px 24px rgba(15, 61, 143, .06);
}
.karte.breit { max-width: 1400px; padding: 28px 32px; }

h1 {
    margin: 0 0 8px;
    font-size: 1.55rem;
    color: var(--blau-dunkel);
}
.untertitel {
    color: var(--grau);
    margin: 0 0 24px;
    font-size: .95rem;
}
.hinweis { color: var(--grau); margin: 0 0 20px; }

/* --- Meldungen -------------------------------------------------------- */
.fehler {
    background: #fef2f2; color: var(--rot);
    border: 1px solid #fecaca; border-radius: 10px;
    padding: 10px 14px; margin: 0 0 16px; font-size: .95rem;
}

/* --- Formularelemente ------------------------------------------------- */
.formular { display: flex; flex-direction: column; gap: 6px; }
label { font-weight: 600; font-size: .92rem; margin-top: 8px; color: var(--grau-dunkel); }

input[type=password], input[type=text], input[type=file] {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid var(--rand);
    border-radius: 10px;
    font-size: 1rem;
    background: #fff;
    font-family: inherit;
    color: var(--text);
}
input[type=text]:focus, input[type=password]:focus, input[type=file]:focus {
    outline: none; border-color: var(--blau);
    box-shadow: 0 0 0 3px rgba(15, 61, 143, .18);
}

button {
    margin-top: 18px;
    background: var(--blau);
    color: #fff;
    border: none;
    border-radius: 10px;
    padding: 13px 18px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s;
}
button:hover { background: var(--blau-dunkel); }
button:disabled { opacity: .6; cursor: default; }

button.sekundaer {
    background: #fff;
    color: var(--grau-dunkel);
    border: 1px solid var(--rand);
}
button.sekundaer:hover { background: var(--blau-hell); border-color: var(--blau); color: var(--blau-dunkel); }

.dateiliste {
    margin: 4px 0 0;
    padding-left: 20px;
    color: var(--grau-dunkel);
    font-size: .85rem;
}

.laden {
    color: var(--blau);
    font-size: .95rem;
    margin-top: 12px;
    display: flex; align-items: center; gap: 10px;
}
.spinner {
    width: 18px; height: 18px;
    border: 2.5px solid var(--blau-hell);
    border-top-color: var(--blau);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Prüfformular (2-Spalten inkl. PDF-Vorschau) --------------------- */
.pdf-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
}
.pdf-layout .felder {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 20px;
}
.pdf-layout .feld { display: flex; flex-direction: column; }
.pdf-layout .feld label { margin-top: 0; }
.feld-intern input {
    background: var(--gelb);
    border-color: var(--gelb-rand);
}
.leer {
    font-weight: 400;
    font-size: .72rem;
    color: var(--grau);
    background: #f3f4f6;
    border-radius: 6px;
    padding: 1px 6px;
    margin-left: 6px;
}
.aktionen {
    grid-column: 1 / -1;
    display: flex; justify-content: flex-end; align-items: center; gap: 16px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--rand);
}
.sekundaer { color: var(--grau); text-decoration: none; }
.sekundaer:hover { text-decoration: underline; color: var(--grau-dunkel); }

.pdf-vorschau {
    position: sticky;
    top: 20px;
    height: calc(100vh - 100px);
    min-height: 640px;
}
.pdf-vorschau iframe {
    width: 100%;
    height: 100%;
    border: 1px solid var(--rand);
    border-radius: 12px;
    background: #fff;
    display: block;
}
.pdf-vorschau .pdf-titel {
    font-size: .82rem;
    color: var(--grau);
    margin: 0 0 8px;
    text-transform: uppercase;
    letter-spacing: .04em;
}

.model-badge {
    display: inline-block;
    background: var(--blau-hell);
    color: var(--blau-dunkel);
    padding: 2px 8px;
    border-radius: 999px;
    font-size: .78rem;
    font-weight: 600;
    letter-spacing: .01em;
}

/* --- Fußzeile --------------------------------------------------------- */
.fuss {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--rand);
    color: var(--grau);
    font-size: .8rem;
}

/* --- Responsiv --------------------------------------------------------- */
@media (max-width: 1100px) {
    .pdf-layout { grid-template-columns: 1fr; }
    .pdf-vorschau {
        position: static;
        height: 520px;
        margin-top: 8px;
    }
}
@media (max-width: 640px) {
    main { padding: 20px 12px; }
    .karte { padding: 24px 20px; }
    .topbar { padding: 12px 16px; }
    .topbar .brand img { height: 34px; }
    .pdf-layout .felder { grid-template-columns: 1fr; }
    .karte.breit { padding: 20px 16px; }
}