:root { --bg: #f3f5f7; --surface: #fff; --line: #dfe5ea; --text: #13202a; --muted: #5d6b76; --accent: #13202a; color-scheme: light; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --bg: #0d151c; --surface: #15212b; --line: #263744; --text: #e6edf2; --muted: #93a4b1; --accent: #e6edf2; color-scheme: dark; }
}
:root[data-theme="dark"] { --bg: #0d151c; --surface: #15212b; --line: #263744; --text: #e6edf2; --muted: #93a4b1; --accent: #e6edf2; color-scheme: dark; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px; background: var(--bg); color: var(--text); font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.box { width: min(360px, 100%); background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 28px; display: grid; gap: 10px; }
h1 { margin: 4px 0 0; font-size: 22px; }
p { margin: 0 0 10px; color: var(--muted); font-size: 14px; }
label { font-size: 13px; font-weight: 600; }
input { font: inherit; padding: 10px 12px; border-radius: 9px; border: 1px solid var(--line); background: transparent; color: var(--text); }
button { font: inherit; font-weight: 700; padding: 10px; border-radius: 9px; border: 0; background: var(--accent); color: var(--surface); cursor: pointer; margin-top: 6px; }
input:focus-visible, button:focus-visible { outline: 2px solid #3a6da8; outline-offset: 2px; }