:root {
  --bg: #f4f1ea; --fg: #1f2328; --muted: #6a6f76; --card: #ffffff; --line: #d9d4c7;
  --accent: #2f6f4f; --accent-fg: #ffffff; --steam: #1b2838; --err: #a4262c; --ok: #2f6f4f;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #16181c; --fg: #e8e6e3; --muted: #9aa0a6; --card: #20242a; --line: #353a42;
          --accent: #4f9d74; --steam: #2a475e; --err: #ff7b72; --ok: #7ee2a8; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 30rem; margin: 3rem auto; padding: 1.5rem; background: var(--card);
       border: 1px solid var(--line); border-radius: 12px; }
h1 { margin: 0 0 1rem; font-size: 1.5rem; }
label { display: block; margin: 1rem 0 .25rem; font-weight: 600; }
label.check { font-weight: 400; display: flex; gap: .5rem; align-items: flex-start; }
input[name=code], input[type=text], input:not([type]) {
  width: 100%; padding: .6rem .7rem; font-size: 1.25rem; letter-spacing: .1em;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--fg);
  text-transform: uppercase; }
#dsid, #dname { text-transform: none; letter-spacing: 0; font-size: 1rem; }
button { margin-top: 1rem; width: 100%; padding: .7rem; font-size: 1rem; font-weight: 600;
         border: 0; border-radius: 8px; background: var(--accent); color: var(--accent-fg); cursor: pointer; }
button.steam { background: var(--steam); }
button.link { width: auto; margin: 0; padding: 0; background: none; color: var(--accent);
              font-weight: 400; text-decoration: underline; }
form.small, p.small { font-size: .875rem; }
.muted { color: var(--muted); }
.error { color: var(--err); font-weight: 600; }
.ok { color: var(--ok); font-size: 1.1rem; }
code { font-size: 1rem; }
form.dev { margin-top: 2rem; padding-top: 1rem; border-top: 2px dashed var(--err); }