:root { color-scheme: light dark; --fg: #1a1d21; --bg: #f7f8fa; --card: #ffffff; --line: #d5d9df; --accent: #1456c8; --accent-fg: #ffffff;
        --warn-bg: #fff4d6; --warn-line: #d9a400; --bad: #a3171c; }
@media (prefers-color-scheme: dark) {
  :root { --fg: #e6e9ee; --bg: #14171b; --card: #1d2227; --line: #343b43; --accent: #6ea2ff; --accent-fg: #0b1220;
          --warn-bg: #3a3012; --warn-line: #b08a00; --bad: #ff8b8f; }
}
* { 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; }
header, main, footer { max-width: 40rem; margin: 0 auto; padding: 1rem 16px; }
header { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; align-items: baseline; }
header .brand { font-weight: 700; color: var(--fg); text-decoration: none; }
nav a { margin-right: 1rem; }
a { color: var(--accent); }
h1 { font-size: 1.6rem; line-height: 1.25; margin: 0.5rem 0 1rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 1rem 1.25rem; margin: 1rem 0; }
.notice { background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: 8px; padding: 0.75rem 1rem; margin: 1rem 0; }
.error { color: var(--bad); font-weight: 600; }
.placeholder { font-size: 0.9rem; opacity: 0.8; border-left: 3px solid var(--line); padding-left: 0.75rem; }
label { display: block; font-weight: 600; margin: 0.75rem 0 0.25rem; }
label.check { font-weight: 400; display: flex; gap: 0.6rem; align-items: flex-start; }
input[type=email], input[type=text] { width: 100%; padding: 0.6rem 0.7rem; font: inherit; color: var(--fg); background: var(--bg);
                                      border: 1px solid var(--line); border-radius: 6px; }
button { font: inherit; font-weight: 600; padding: 0.6rem 1.2rem; margin-top: 1rem; color: var(--accent-fg); background: var(--accent);
         border: 0; border-radius: 6px; cursor: pointer; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.secondary { color: var(--fg); background: transparent; border: 1px solid var(--line); }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9rem; }
pre.token { white-space: pre-wrap; overflow-wrap: anywhere; background: var(--bg); border: 1px solid var(--line); border-radius: 6px;
            padding: 0.6rem 0.7rem; }
footer { font-size: 0.9rem; opacity: 0.8; }
footer a { margin-right: 1rem; }