/* Aortenregister – eigenständiges Design (bewusst unabhängig von der DGPTM-Marke).
   Palette: tiefes Aorten-Bordeaux + Tinte/Schiefer, klare System-Sans. */
:root {
    --ar-primary: #8b1e3f;      /* Aorten-Bordeaux */
    --ar-primary-dk: #6d152f;
    --ar-ink: #1c2733;
    --ar-slate: #52606d;
    --ar-bg: #f5f6f8;
    --ar-surface: #ffffff;
    --ar-border: #dfe3e8;
    --ar-error: #b42318;
    --ar-radius: 10px;
    --ar-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font-family: var(--ar-font); color: var(--ar-ink); background: var(--ar-bg); line-height: 1.55; }

.ar-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 28px; background: var(--ar-ink); color: #fff;
}
.ar-brand { color: #fff; font-weight: 700; letter-spacing: .3px; text-decoration: none; font-size: 1.15rem; }
.ar-brand::before { content: "◗ "; color: var(--ar-primary); }
.ar-header nav a { color: #cdd5df; text-decoration: none; margin-left: 20px; }
.ar-header nav a:hover { color: #fff; }

.ar-main { max-width: 960px; margin: 0 auto; padding: 32px 24px; }
h1 { color: var(--ar-ink); font-size: 1.6rem; margin: 0 0 .6em; }

.ar-hero { text-align: center; padding: 48px 16px; }
.ar-hero h1 { font-size: 2rem; }
.ar-hero p { color: var(--ar-slate); max-width: 40rem; margin: 0 auto 1.6em; }

.ar-btn {
    display: inline-block; background: var(--ar-primary); color: #fff;
    padding: 10px 20px; border: 0; border-radius: var(--ar-radius);
    font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
}
.ar-btn:hover { background: var(--ar-primary-dk); }

.ar-form { display: grid; gap: 14px; max-width: 24rem; }
.ar-form label { display: grid; gap: 4px; font-weight: 600; color: var(--ar-slate); }
.ar-form input, .ar-form select {
    padding: 9px 11px; border: 1px solid var(--ar-border);
    border-radius: 8px; font: inherit; background: var(--ar-surface);
}
.ar-error { color: var(--ar-error); font-weight: 600; }
.ar-messages { list-style: none; padding: 0; }
.ar-messages li { background: #eef6ff; border: 1px solid #cfe2f5; padding: 8px 12px; border-radius: 8px; }

.ar-tiles { list-style: none; padding: 0; display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.ar-tiles li { background: var(--ar-surface); border: 1px solid var(--ar-border); border-radius: var(--ar-radius); padding: 18px; }
.ar-tiles li a { color: var(--ar-primary); font-weight: 600; text-decoration: none; }

table.ar-table { width: 100%; border-collapse: collapse; background: var(--ar-surface); }
table.ar-table th, table.ar-table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--ar-border); }
table.ar-table th { color: var(--ar-slate); font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; }