:root {
  --bg: #111111;              /* big24-Schwarz */
  --card: #1c1c1c;            /* dunkle Karte */
  --topbar: #000000;          /* schwarzer Header */
  --ink: #f4f5f6;             /* heller Text */
  --muted: #9aa0a6;           /* graue Sekundärtexte */
  --line: #333537;            /* dunkle Ränder */
  --input-bg: #161616;
  --accent: #0bfff8;          /* big24-Cyan */
  --accent-ink: #06231f;      /* dunkler Text auf Cyan */
  --accent-soft: rgba(11,255,248,.12);
  --ok-bg: #0f3322; --ok-ink: #4ade80;
  --err-bg: #3a1414; --err-ink: #f87171;
  --info-bg: #0e2a33; --info-ink: #5bd6e8;
  --radius: 12px;
}

* { box-sizing: border-box; }

/* Das hidden-Attribut muss display-Klassen (z.B. .stack) schlagen. */
[hidden] { display: none !important; }

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

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; background: var(--topbar); border-bottom: 2px solid var(--accent);
}
.brand-logo { height: 42px; width: auto; display: block; }
.langnav a {
  text-decoration: none; color: var(--muted); font-weight: 700;
  padding: 4px 8px; border-radius: 6px; font-size: 14px;
}
.langnav a.active { color: var(--accent); background: var(--accent-soft); }

.container { max-width: 760px; margin: 28px auto; padding: 0 16px; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; box-shadow: 0 1px 3px rgba(0,0,0,.4);
}
.card.wide { max-width: 760px; }
h1 { margin: 0 0 6px; font-size: 1.5rem; }
.muted { color: var(--muted); }
.center { text-align: center; }

.stack { display: flex; flex-direction: column; gap: 16px; margin-top: 18px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 18px; }
.grid .full { grid-column: 1 / -1; }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }

label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; font-size: .92rem; }
input, select {
  font: inherit; padding: 11px 12px; border: 1px solid var(--line);
  border-radius: 9px; background: var(--input-bg); color: var(--ink); font-weight: 400;
}
input::placeholder { color: #6b7075; }
input:focus, select:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
input[readonly] { background: #0e0e0e; color: var(--muted); }
select option { background: var(--card); }

.checkbox { flex-direction: row; align-items: flex-start; gap: 10px; font-weight: 400; }
.checkbox input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--accent); }

.btn { font: inherit; font-weight: 800; border: 0; border-radius: 9px; padding: 13px 18px; cursor: pointer; }
.btn.primary { background: var(--accent); color: var(--accent-ink); text-transform: uppercase; letter-spacing: .03em; }
.btn.primary:hover { box-shadow: 0 0 16px rgba(11,255,248,.4); }

.tabs { display: flex; gap: 8px; margin-top: 18px; }
.tab {
  flex: 1; padding: 10px; border: 1px solid var(--line); background: transparent;
  border-radius: 9px; font-weight: 700; cursor: pointer; color: var(--muted);
}
.tab.active { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

.alert { padding: 12px 14px; border-radius: 9px; margin: 14px 0; font-size: .94rem; }
.alert.success { background: var(--ok-bg); color: var(--ok-ink); }
.alert.error { background: var(--err-bg); color: var(--err-ink); }
.alert.info { background: var(--info-bg); color: var(--info-ink); }

.err { color: var(--err-ink); font-weight: 600; font-size: .82rem; }

.disclaimer { border: 1px solid var(--line); border-radius: 9px; padding: 10px 14px; background: #161616; }
.disclaimer summary { cursor: pointer; font-weight: 700; }
.disclaimer p { color: var(--muted); font-size: .9rem; }

.code-input { letter-spacing: .5em; text-align: center; font-size: 1.4rem; font-weight: 700; }

.form-head { display: flex; align-items: center; justify-content: space-between; }
.link-muted { color: var(--muted); font-size: .9rem; }
.sensitive-note { color: var(--muted); font-size: .86rem; background: #161616; border: 1px dashed var(--line); padding: 10px 12px; border-radius: 9px; }

a { color: var(--accent); }
.footer { text-align: center; color: var(--muted); font-size: .82rem; padding: 24px 16px; }