/* BotRelay - public site (served by the relay). No external fonts, scripts or trackers.
   Look: warm and friendly for everyday visitors (shops, families, students) - rounded cards, soft colours,
   rounded system fonts; the monospace font is kept only for code on the developer pages. */
:root {
  --paper: #fbf7f1;
  --paper-2: #f4ede2;
  --card: #ffffff;
  --ink: #2b2622;
  --ink-2: #5b544c;
  --ink-3: #8c847a;
  --rule: #ebe2d4;
  --signal: #f26b3a;
  --signal-ink: #c4501f;
  --tint: #fde9dd;
  --sealed: #2f9e84;
  --tint-2: #e0f3ec;
  --shadow: 0 1px 2px rgba(60, 40, 20, .05), 0 8px 24px rgba(60, 40, 20, .07);
  --radius: 18px;
  --sans: ui-rounded, "SF Pro Rounded", "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #1a1714; --paper-2: #23201c; --card: #25211d; --ink: #f3ece2; --ink-2: #c9c0b3; --ink-3: #8f8679;
    --rule: #3a342d; --signal: #ff8455; --signal-ink: #ff9d78; --tint: #3a2a20; --sealed: #4cc3a6; --tint-2: #1f332d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; color: var(--ink); font: 17px/1.65 var(--sans);
  background: var(--paper) radial-gradient(1200px 520px at 85% -120px, var(--tint), transparent 70%) no-repeat;
}
a { color: inherit; }
::selection { background: var(--signal); color: #fff; }

/* bilingual: only the chosen language is shown */
html[data-lang="en"] [lang="zh-Hant"], html[data-lang="zh-Hant"] [lang="en"] { display: none !important; }
html[data-lang="zh-Hant"] body { letter-spacing: .02em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

/* header */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid color-mix(in srgb, var(--rule) 60%, transparent); }
.top .wrap { display: flex; align-items: center; gap: 28px; height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 800 19px var(--sans); }
.brand svg { width: 28px; height: 28px; }
.nav { display: flex; gap: 6px; margin-left: 8px; }
.nav a { text-decoration: none; color: var(--ink-2); font-size: 15px; font-weight: 600; padding: 6px 12px; border-radius: 999px; }
.nav a:hover { color: var(--ink); background: var(--paper-2); }
.nav a[aria-current="page"] { color: var(--signal-ink); background: var(--tint); }
.actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
/* Logged in to the portal (site.js): Portal in the menu, Profile / Log out instead of Log in / Register, and
   "Go to the Portal" instead of the sign-up buttons and notes. */
html.in .out-only, html:not(.in) .in-only { display: none !important; }
.lang { display: inline-flex; background: var(--paper-2); border-radius: 999px; padding: 3px; font: 600 12.5px var(--sans); }
.lang button { all: unset; cursor: pointer; padding: 4px 10px; border-radius: 999px; color: var(--ink-3); }
.lang button[aria-pressed="true"] { background: var(--card); color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,.12); }
.btn { display: inline-block; text-decoration: none; font: 700 14.5px var(--sans); padding: 9px 18px; border: 1.5px solid var(--rule); border-radius: 999px; background: var(--card); transition: transform .15s, background .15s, border-color .15s; }
.btn:hover { transform: translateY(-1px); }
.btn.solid { background: var(--signal); border-color: var(--signal); color: #fff; }
.btn.solid:hover { background: var(--signal-ink); border-color: var(--signal-ink); }
.btn.line:hover { border-color: var(--signal); color: var(--signal-ink); }
.btn.big { font-size: 16px; padding: 13px 26px; }

/* hero */
.hero { padding: 80px 0 64px; display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; }
.kicker { display: inline-block; font: 700 14px var(--sans); color: var(--signal-ink); background: var(--tint); padding: 6px 14px; border-radius: 999px; margin: 0 0 20px; }
h1 { font: 800 clamp(38px, 5vw, 60px)/1.1 var(--sans); letter-spacing: -.02em; margin: 0 0 22px; }
h1 em { font-style: normal; color: var(--signal); }
html[data-lang="zh-Hant"] h1 { letter-spacing: 0; line-height: 1.22; font-size: clamp(34px, 4.6vw, 54px); }
.lede { font-size: 19px; color: var(--ink-2); max-width: 34em; margin: 0 0 30px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; }
.note { font-size: 14px; color: var(--ink-3); margin-top: 16px; }

/* diagram */
.diagram { background: var(--card); padding: 20px; border-radius: 24px; box-shadow: var(--shadow); position: relative; }
.diagram svg { width: 100%; height: auto; display: block; }
.diagram .cap { font: 700 13px var(--sans); color: var(--ink-3); display: flex; justify-content: space-between; margin-bottom: 8px; }
.d-box { fill: var(--paper); stroke: var(--rule); stroke-width: 1.5; }
.d-box.hot { fill: var(--tint); stroke: var(--signal); }
.d-text { fill: var(--ink); font: 700 14px var(--sans); }
.d-sub { fill: var(--ink-2); font: 500 12px var(--sans); }
.d-line { stroke: var(--ink-3); stroke-width: 1.5; fill: none; }
.d-dash { stroke: var(--signal); stroke-width: 2; stroke-dasharray: 5 5; stroke-linecap: round; fill: none; }
.d-sealed { fill: var(--sealed); font: 700 12px var(--sans); }
.d-zone { fill: var(--tint-2); fill-opacity: .55; stroke: var(--sealed); stroke-opacity: .5; stroke-dasharray: 3 5; }
.d-head { fill: var(--ink-3); }
.d-head.hot { fill: var(--signal); }

/* sections */
section.block { padding: 64px 0; }
.sec-head { margin-bottom: 32px; }
.num { display: none; }
h2 { font: 800 clamp(28px, 3.2vw, 38px)/1.2 var(--sans); margin: 0; letter-spacing: -.01em; }
html[data-lang="zh-Hant"] h2 { letter-spacing: 0; }
.sec-head p { color: var(--ink-2); margin: 10px 0 0; max-width: 40em; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step { padding: 26px; background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); }
.step .n { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: var(--tint); font: 800 20px/1 var(--sans); color: var(--signal-ink); margin-bottom: 16px; }
.step h3, .card h3 { font: 800 18.5px/1.35 var(--sans); margin: 0 0 8px; }
.step p, .card p { margin: 0; color: var(--ink-2); font-size: 15.5px; }
.where { display: inline-block; margin-top: 16px; font: 600 12.5px var(--sans); color: var(--ink-3); background: var(--paper-2); border-radius: 999px; padding: 3px 10px; }

.grid2, .grid3 { display: grid; gap: 20px; }
.grid2 { grid-template-columns: repeat(2, 1fr); }
.grid3 { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--card); padding: 24px; border-radius: var(--radius); box-shadow: var(--shadow); }
.card .tag { display: inline-block; font: 700 12.5px var(--sans); color: var(--sealed); background: var(--tint-2); border-radius: 999px; padding: 3px 11px; margin-bottom: 10px; }
.card.soon { background: transparent; box-shadow: none; border: 2px dashed var(--rule); }
.card.soon .tag { color: var(--ink-3); background: var(--paper-2); }
.story { margin: 6px 0 0; padding-left: 20px; color: var(--ink-2); font-size: 15.5px; }
.story li { margin: 4px 0; }
.story li::marker { color: var(--signal); font-weight: 800; }
.more { margin: 24px 0 0; }
.shot { margin: 0 0 16px; border-radius: 12px; background: var(--paper-2); aspect-ratio: 16 / 9; overflow: hidden; }
.shot a { display: block; height: 100%; }
.shot img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: top; }
/* use-case illustrations: line drawings in the site's ink and signal colours (inline SVG, no files) */
.il { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; margin: 0 0 16px; background: var(--tint); border-radius: 12px; }
.il .s, .il .a, .il .w, .il .d { fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.il .s { stroke: var(--ink); }
.il .a { stroke: var(--signal); }
.il .w { stroke: #fff; }
.il .d { stroke: var(--signal); stroke-dasharray: 4 5; }
.il .f { fill: var(--card); stroke: var(--ink); stroke-width: 1.8; stroke-linejoin: round; }
.il .af { fill: var(--signal); }
.il .t { fill: var(--rule); }
.il .b { fill: var(--sealed); stroke: var(--ink); stroke-width: 1.8; }
.il .q { fill: var(--signal); font: 800 22px var(--sans); }

.band { padding: 8px 0 72px; }
.band .wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; background: linear-gradient(120deg, var(--signal), #f59a4a); color: #fff; border-radius: 28px; padding: 44px 48px; max-width: 1064px; }
.band h2 { color: #fff; }
.band .btn { border-color: rgba(255,255,255,.7); background: transparent; color: #fff; }
.band .btn.solid { background: #fff; border-color: #fff; color: var(--signal-ink); }
.band .btn.solid:hover { background: #fff7f0; }

/* Applications page: one card per store application */
.apps .card { display: flex; flex-direction: column; gap: 12px; }
.apphead { display: flex; align-items: center; gap: 14px; }
.apphead h3 { margin: 0; }
.apphead .tag { margin: 4px 0 0; }
.appicon { width: 48px; height: 48px; border-radius: 14px; flex: none; object-fit: cover; object-position: top; }
.appicon.letter { display: grid; place-items: center; background: var(--tint); font: 800 22px var(--sans); color: var(--signal-ink); }
.disc { display: grid; grid-template-columns: max-content 1fr; gap: 6px 14px; margin: 0; font-size: 14.5px; }
.disc dt { font: 700 13px var(--sans); color: var(--ink-3); padding-top: 1px; }
.disc dd { margin: 0; color: var(--ink-2); }
.apps details { font-size: 14.5px; color: var(--ink-2); }
.apps summary { cursor: pointer; font: 700 13.5px var(--sans); color: var(--sealed); }
.apps details ul { margin: 8px 0 0; padding-left: 20px; }
.apps .links { margin-top: auto; font: 600 14px var(--sans); }
.apps .links a, .card p a { color: var(--signal-ink); }
.steps.four { grid-template-columns: repeat(4, 1fr); }
/* BotGateway page: the menu bar menu, downloads (placeholders until the signed builds) */
.menumock { list-style: none; margin: 0 auto; padding: 6px; max-width: 290px; background: var(--card); border: 1px solid var(--rule); border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,.12); font: 13.5px var(--sans); }
.menumock li { padding: 5px 12px; border-radius: 5px; display: flex; justify-content: space-between; gap: 12px; }
.menumock li:first-child { background: var(--signal); color: #fff; }
.menumock li span { color: var(--ink-3); font-size: 12px; }
.menumock li.sep { padding: 0; margin: 5px 8px; border-top: 1px solid var(--rule); border-radius: 0; }
.downloads .card { display: flex; flex-direction: column; gap: 10px; }
.downloads .btn.dl { margin-top: auto; text-align: center; opacity: .55; cursor: not-allowed; }
.appcall { display: flex; align-items: center; gap: 12px 20px; flex-wrap: wrap; justify-content: space-between; background: var(--card); box-shadow: var(--shadow); border-radius: var(--radius); padding: 18px 24px; margin-bottom: 24px; }
.appcall p { margin: 0; color: var(--ink-2); }

.page-head { padding: 72px 0 32px; }
.page-head h1 { font-size: clamp(36px, 4.6vw, 54px); }
.mono-list { list-style: none; padding: 0; margin: 0; font: 14px var(--mono); }
.mono-list li { padding: 10px 0; border-bottom: 1px dashed var(--rule); display: flex; gap: 16px; }
.mono-list li b { color: var(--signal-ink); font-weight: 600; min-width: 9em; }
code { font: 0.9em var(--mono); background: var(--paper-2); padding: 1px 6px; border-radius: 6px; }

footer { border-top: 1px solid var(--rule); padding: 28px 0 40px; font-size: 14px; color: var(--ink-3); }
footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer a { color: var(--ink-2); text-decoration: none; margin-left: 18px; }
footer a:hover { color: var(--signal-ink); }

@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; padding-top: 48px; }
  .steps, .steps.four, .grid3 { grid-template-columns: 1fr; }
  .disc { grid-template-columns: 1fr; gap: 2px; }
  .disc dd { margin-bottom: 6px; }
  .grid2 { grid-template-columns: 1fr; }
  .nav { display: none; }
  .wrap { padding: 0 16px; }
  .top .wrap { gap: 12px; }
  .band .wrap { margin: 0 16px; padding: 32px 24px; }
  .actions .btn.solid { display: none; } /* phones: Log in only - the portal has a Sign up tab */
  .actions .btn { padding: 7px 12px; }
}