/* Layout: one reading column under a three-tab page bar (公告 / 設定步驟 / 驗證方法). */
:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --ink: #17202b;
  --muted: #586373;
  --line: #dbe0e6;
  --accent: #0a6684;
  --accent-soft: #e2f0f5;
  --ok: #1d7a4c;
  --ok-soft: #e3f3ea;
  --warn: #9a5c00;
  --warn-soft: #fbf0dc;
  --bad: #b3222b;
  --bad-soft: #fae4e5;
  --code-bg: #edf0f3;
  --shadow: 0 1px 2px rgba(20, 32, 48, .06), 0 4px 16px rgba(20, 32, 48, .05);
  --f-display: "IBM Plex Sans", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --f-body: "IBM Plex Sans", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1419; --surface: #161d25; --ink: #e5eaef; --muted: #9ba7b3; --line: #2a3541;
    --accent: #56b4d3; --accent-soft: #12303b; --ok: #4fc58c; --ok-soft: #133024;
    --warn: #e2a64b; --warn-soft: #34270f; --bad: #f1737c; --bad-soft: #3a1a1d; --code-bg: #1c2530;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1419; --surface: #161d25; --ink: #e5eaef; --muted: #9ba7b3; --line: #2a3541;
  --accent: #56b4d3; --accent-soft: #12303b; --ok: #4fc58c; --ok-soft: #133024;
  --warn: #e2a64b; --warn-soft: #34270f; --bad: #f1737c; --bad-soft: #3a1a1d; --code-bg: #1c2530;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--f-body); font-size: 16px; line-height: 1.75; }
img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
code { font-family: var(--f-mono); font-size: .9em; background: var(--code-bg); padding: .08em .35em; border-radius: 4px; overflow-wrap: anywhere; }

.wrap { max-width: 820px; margin: 0 auto; padding-inline: 20px; }

/* page bar */
.bar { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10; }
.bar .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 6px 16px; padding-block: 10px; }
.bar .brand { font: 600 14px/1.3 var(--f-mono); color: var(--ink); text-decoration: none; letter-spacing: .01em; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; margin: 0; padding: 0; list-style: none; }
.tabs a { display: block; padding: 6px 12px; border-radius: 6px; font: 500 14px/1.3 var(--f-display); color: var(--muted); text-decoration: none; }
.tabs a:hover { background: var(--accent-soft); color: var(--ink); }
.tabs a[aria-current="page"] { background: var(--accent); color: var(--surface); }

/* hero */
.hero { padding-block: 40px 28px; }
.eyebrow { font: 500 13px/1.5 var(--f-mono); color: var(--accent); margin: 0 0 12px; }
h1 { font: 700 clamp(27px, 4.4vw, 38px)/1.28 var(--f-display); margin: 0 0 14px; text-wrap: balance; letter-spacing: -.01em; }
.lede { font-size: 18px; color: var(--muted); margin: 0; max-width: 62ch; }

main { padding-bottom: 72px; }
.hero + section { padding-top: 0; }
section { padding-top: 34px; scroll-margin-top: 72px; }
h2 { font: 700 23px/1.4 var(--f-display); margin: 0 0 12px; text-wrap: balance; }
h3 { font: 600 18px/1.45 var(--f-display); margin: 28px 0 8px; text-wrap: balance; }
p { margin: 0 0 14px; }
ul, ol { padding-left: 1.4em; margin: 0 0 16px; }
li { margin-bottom: 6px; }
.muted { color: var(--muted); }

.note { border-radius: 8px; padding: 12px 16px; margin: 16px 0; font-size: 15px; border: 1px solid; }
.note b:first-child { display: block; font: 600 13px/1.5 var(--f-display); letter-spacing: .04em; margin-bottom: 2px; }
.note.warn { background: var(--warn-soft); border-color: color-mix(in srgb, var(--warn) 35%, transparent); }
.note.warn b:first-child { color: var(--warn); }
.note.bad { background: var(--bad-soft); border-color: color-mix(in srgb, var(--bad) 35%, transparent); }
.note.bad b:first-child { color: var(--bad); }
.note.info { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.note.info b:first-child { color: var(--accent); }

.tbl { overflow-x: auto; margin: 14px 0 20px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 14px; line-height: 1.55; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font: 600 13px/1.4 var(--f-display); color: var(--muted); background: var(--code-bg); white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td.mono { font-family: var(--f-mono); font-size: 13px; white-space: nowrap; }
td.nw { white-space: nowrap; }

.pill { display: inline-block; font: 500 12px/1.3 var(--f-mono); padding: 2px 8px; border-radius: 999px; white-space: nowrap; }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.bad { background: var(--bad-soft); color: var(--bad); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.dim { background: var(--code-bg); color: var(--muted); }

/* the four required actions on the notice page */
.todo { list-style: none; padding: 0; margin: 18px 0 8px; display: grid; gap: 10px; counter-reset: todo; }
.todo li { margin: 0; display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; counter-increment: todo; }
.todo li::before { content: counter(todo); width: 40px; height: 40px; border-radius: 50%; background: var(--accent); color: var(--surface); display: grid; place-items: center; font: 600 17px/1 var(--f-mono); }
.todo strong { display: block; font: 600 17px/1.45 var(--f-display); margin-bottom: 2px; }
.todo span { color: var(--muted); font-size: 15px; display: block; }
.todo a { font-size: 14px; }

.sigs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 14px 0 6px; }
.sig { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; display: grid; gap: 4px; }
.sig .id { font: 600 20px/1.2 var(--f-mono); }
.sig .nm { font-size: 14px; }
.sig .row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }

.links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 14px 0; }
.links a { display: grid; gap: 2px; padding: 14px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; text-decoration: none; color: var(--ink); }
.links a:hover { border-color: var(--accent); }
.links a b { font: 600 16px/1.4 var(--f-display); color: var(--accent); }
.links a span { font-size: 14px; color: var(--muted); }

/* GUI steps */
.path { display: flex; flex-wrap: wrap; gap: 4px 8px; align-items: baseline; font-size: 14px; margin: 14px 0; padding: 10px 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; }
.path span:first-child { font: 600 12px/1.6 var(--f-display); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.path b { font-weight: 500; min-width: 0; overflow-wrap: anywhere; }
.step { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 12px; margin: 24px 0 10px; align-items: start; }
.step .n { width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: var(--surface); display: grid; place-items: center; font: 600 14px/1 var(--f-mono); }
.step h4 { font: 600 17px/1.5 var(--f-display); margin: 3px 0 0; }

figure { margin: 14px 0 22px; }
figure button { display: block; width: 100%; padding: 0; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--surface); cursor: zoom-in; box-shadow: var(--shadow); }
figure.narrow button { max-width: 520px; }
figure img { display: block; width: 100%; height: auto; }
figcaption { font-size: 13px; color: var(--muted); margin-top: 8px; }

.code { position: relative; margin: 12px 0 18px; }
.code pre { margin: 0; background: var(--code-bg); border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; padding-right: 72px; overflow-x: auto; font: 13px/1.6 var(--f-mono); color: var(--ink); }
.code button { position: absolute; top: 8px; right: 8px; font: 500 12px/1 var(--f-display); padding: 6px 10px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; }
.code button:hover { border-color: var(--accent); color: var(--accent); }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 9px 14px; border-radius: 8px; font: 600 14px/1.2 var(--f-display); text-decoration: none; border: 1px solid var(--accent); }
.btn.primary { background: var(--accent); color: var(--surface); }
.btn.ghost { color: var(--accent); }
.btns { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 18px; }

.next { margin-top: 40px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between; }
.next span { color: var(--muted); font-size: 14px; }

footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }

.lightbox { position: fixed; inset: 0; background: rgba(8, 12, 16, .88); display: grid; place-items: center; padding: 24px; z-index: 50; cursor: zoom-out; }
.lightbox img { max-width: 100%; max-height: 100%; border-radius: 6px; background: #fff; }

@media (max-width: 640px) {
  body { font-size: 15px; }
  .wrap { padding-inline: 16px; }
  .tabs { gap: 2px; }
  .tabs a { padding: 6px 7px; font-size: 13px; }
  .sigs, .links { grid-template-columns: minmax(0, 1fr); }
  .todo li { grid-template-columns: 32px minmax(0, 1fr); gap: 12px; padding: 14px; }
  .todo li::before { width: 32px; height: 32px; font-size: 15px; }
  .hero { padding-block: 28px 20px; }
}
@media (prefers-reduced-motion: no-preference) {
  .tabs a, .links a, .btn, .code button { transition: background-color .15s, color .15s, border-color .15s; }
}