:root { --bg: #0e141b; --surface: #151d26; --fg: #e4ebf2; --muted: #93a2b3; --line: #263241; --accent: #7cc0ff; --bad: #f07a6c; color-scheme: dark; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--fg);
       font: 17px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; padding: 24px; }
main { width: 100%; max-width: 380px; display: grid; gap: 16px; }
h1 { font-size: 28px; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
section { display: grid; gap: 14px; }
form { display: grid; gap: 10px; }
label { color: var(--muted); font-size: 14px; }
input { font: 600 26px/1 ui-monospace, Menlo, monospace; letter-spacing: 0.12em; text-transform: uppercase; text-align: center;
        padding: 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface); color: var(--fg); width: 100%; }
input:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
button { font: 600 17px/1 system-ui, -apple-system, "Segoe UI", sans-serif; padding: 14px 18px; border-radius: 12px; border: 0; background: var(--accent); color: #06121f; cursor: pointer; }
button:focus-visible { outline: 2px solid var(--fg); outline-offset: 2px; }
button:disabled { opacity: 0.5; cursor: default; }
button.secondary { background: transparent; color: var(--fg); border: 1px solid var(--line); }
button.link { background: none; color: var(--accent); padding: 0; font-weight: 500; font-size: inherit; }
.row { display: flex; gap: 10px; flex-wrap: wrap; }
.row button { flex: 1; }
.who, .note { color: var(--muted); font-size: 14px; }
#status { color: var(--muted); font-size: 15px; min-height: 1.5em; }
#status.error { color: var(--bad); }
input.key { font-size: 17px; letter-spacing: 0.06em; padding: 14px 10px; }
label.check { display: flex; gap: 10px; align-items: flex-start; color: var(--muted); font-size: 14px; }
label.check input { width: auto; padding: 0; margin: 2px 0 0; accent-color: var(--accent); }
#check strong { color: var(--fg); font-variant-numeric: tabular-nums; letter-spacing: 0.04em; }