:root {
  color-scheme: light dark;
  --bg: #f6f6f4; --card: #fff; --fg: #1d1d1f; --muted: #5f6368; --line: #dcdcd6;
  --accent: #1a56b8; --accent-fg: #fff; --ok: #1b7f3b; --bad: #b3261e; --warn-bg: #fff4e5; --bad-bg: #fdecea; --ok-bg: #e8f5ec;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #151515; --card: #202020; --fg: #ececec; --muted: #a3a3a3; --line: #3a3a3a; --accent: #6ea2ff; --accent-fg: #0b1b3a;
    --ok: #67d68a; --bad: #ff8a80; --warn-bg: #3a2c18; --bad-bg: #3a1c1a; --ok-bg: #16301e; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15.5px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 38rem; margin: 0 auto; padding: 1.5rem 1rem 2.5rem; }
h1 { font-size: 1.5rem; line-height: 1.25; margin: .2rem 0 .3rem; display: flex; flex-wrap: wrap; align-items: center; gap: .3rem .7rem; }
h2 { font-size: 1.05rem; margin: 0 0 .5rem; display: flex; align-items: center; gap: .6rem; }
a { color: var(--accent); }
.lede { color: var(--muted); margin: 0 0 .5rem; }
.badge { display: inline-block; font-size: .75rem; border: 1px solid var(--line); border-radius: 999px; padding: .05rem .6rem; font-weight: 500; color: var(--muted); white-space: nowrap; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: .85rem 1rem; margin: .75rem 0; box-shadow: 0 1px 2px rgba(0,0,0,.04); }
.card[hidden], [hidden] { display: none !important; }
.n { display: inline-grid; place-items: center; width: 1.5rem; height: 1.5rem; border-radius: 50%; background: var(--accent); color: var(--accent-fg); font-size: .85rem; font-weight: 600; flex: none; }
.steps { padding-left: 1.2rem; margin: .2rem 0; } .steps li { margin: .25rem 0; }
.hint { color: var(--muted); font-size: .88rem; margin: .5rem 0 0; }
.notice { border-radius: 10px; padding: .8rem 1rem; margin: 1rem 0; }
.notice.bad { background: var(--bad-bg); border-left: 4px solid var(--bad); }
button, .file { font: inherit; padding: .5rem .95rem; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--fg); cursor: pointer; }
button:hover:not(:disabled), .file:hover { border-color: var(--accent); }
button:focus-visible, .file:focus-within, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
button.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 600; }
button:disabled { opacity: .5; cursor: not-allowed; }
.row { display: flex; flex-wrap: wrap; gap: .6rem; margin: .6rem 0; }
.file input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.file { position: relative; display: inline-block; }
.checks { list-style: none; padding: 0; margin: .7rem 0 0; }
.checks li { padding: .1rem 0 .1rem 1.8rem; position: relative; }
.checks li::before { content: "\2022"; position: absolute; left: .4rem; color: var(--muted); }
.checks li.ok::before { content: "\2713"; color: var(--ok); font-weight: 700; }
.checks li.fail::before { content: "\2717"; color: var(--bad); font-weight: 700; }
.phases { list-style: none; padding: 0; margin: .4rem 0 1rem; }
.phases li { padding: .2rem 0 .2rem 1.8rem; position: relative; color: var(--muted); }
.phases li::before { content: "\25CB"; position: absolute; left: .3rem; }
.phases li.active { color: var(--fg); font-weight: 600; } .phases li.active::before { content: "\25CF"; color: var(--accent); }
.phases li.done::before { content: "\2713"; color: var(--ok); } .phases li.done { color: var(--fg); }
.bar { height: 10px; background: var(--line); border-radius: 999px; overflow: hidden; }
.bar span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .15s linear; }
#result { border-left-width: 5px; }
#result.ok { border-left-color: var(--ok); background: var(--ok-bg); }
#result.fail { border-left-color: var(--bad); background: var(--bad-bg); }
#result h2 { margin-bottom: .4rem; }
details > summary { cursor: pointer; font-weight: 600; }
pre { background: rgba(127,127,127,.12); border-radius: 8px; padding: .7rem; max-height: 16rem; overflow: auto; font-size: .78rem; white-space: pre-wrap; word-break: break-word; }
.faq { padding-left: 1.2rem; } .faq li { margin: .5rem 0; }
code { background: rgba(127,127,127,.18); padding: .05em .3em; border-radius: 4px; }
footer { color: var(--muted); font-size: .82rem; margin-top: 1.5rem; } footer p { margin: .4rem 0; }
@media (max-width: 30rem) { button, .file { width: 100%; text-align: center; } }