:root { color-scheme: light dark; --bg: #f0f3f8; --panel: #fff; --fg: #202638; --muted: #4e5c72; --line: #8793a7; --accent: #354ec7; --button: #fff; --warn: #793514; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --bg: #111620; --panel: #1c2432; --fg: #f2f4fb; --muted: #b8c3d5; --line: #7d8aa2; --accent: #9aacff; --button: #17204a; --warn: #ffcda5; }
}
:root[data-theme="dark"] { color-scheme: dark; --bg: #111620; --panel: #1c2432; --fg: #f2f4fb; --muted: #b8c3d5; --line: #7d8aa2; --accent: #9aacff; --button: #17204a; --warn: #ffcda5; }
:root[data-theme="light"] { color-scheme: light; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: system-ui, sans-serif; font-size: 1rem; line-height: 1.55; padding: 3rem 1rem; }
main { max-width: 36rem; margin: 0 auto; padding: clamp(1.2rem, 5vw, 2.5rem); background: var(--panel); border: 1px solid var(--line); border-radius: 1rem; }
header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.brand { font-weight: 750; letter-spacing: .04em; }
.theme-label { font-size: .875rem; color: var(--muted); }
select { margin-left: .3rem; }
h1 { font-size: clamp(1.6rem, 5vw, 2rem); line-height: 1.2; margin-top: 2rem; }
p { overflow-wrap: anywhere; }
label { display: block; font-weight: 600; }
input, button, select { font: inherit; border: 1px solid var(--line); border-radius: .4rem; min-height: 2.75rem; }
input { display: block; width: 100%; padding: .55rem .7rem; margin-top: .3rem; background: var(--panel); color: var(--fg); }
select { background: var(--panel); color: var(--fg); }
button { padding: .65rem 1rem; font-weight: 650; cursor: pointer; background: var(--accent); color: var(--button); margin-top: 1.2rem; }
button:disabled { cursor: wait; opacity: .65; }
button.secondary { background: transparent; color: var(--fg); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.hint, .footnote { color: var(--muted); font-size: .9rem; }
.hint { margin-top: .4rem; }
.footnote { border-top: 1px solid var(--line); margin-top: 2rem; padding-top: 1rem; }
#warning { color: var(--warn); border-left: .25rem solid currentColor; padding-left: .8rem; }
[hidden] { display: none !important; }