/* Shared styles for kaikouqian.com pages (index.html, en/index.html, guides/).
   Layout: a hero with the 2D stage, then sections that each show one real screen of the app.
   The scenario guides (guides/) are one article column; their styles are at the end.
   Every image under img/ is a screenshot of the app or drawn by its stage (build_assets.mjs). */
/* Palette A (2026-10-31, reports/网站全身体检_2026-10-31.md): neutral greys, the brand blue only where something can be done
   (the primary button, body links, focus). --band tints alternate sections; --accent-soft (wash) marks what is selected or playing. */
:root {
  --paper: #FFFFFF;
  --band: #F5F5F7;
  --card: #FFFFFF;
  --ink: #1D1D1F;
  --ink-2: #6E6E73;
  --rule: #D2D2D7;
  --accent: #2350CC;
  --accent-hover: #1E41A8;
  --accent-ink: #FFFFFF;
  --accent-soft: #EAF0FE;
  --mark: #FFE07A;
  --mark-ink: #1D1D1F;
  --me: #5B3FA8;
  --ok: #2B7550;
  --warn: #9A5B12;
  --err: #B3372E;
  --shadow: none;
  /* headings and text in one sans family, the visitor's own system UI fonts (nothing downloaded, nothing to license):
     SF + PingFang on Apple devices, Segoe UI + Microsoft YaHei on Windows (Latin first, Chinese falls through), Roboto + Noto on Android */
  --body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Segoe UI", "Microsoft YaHei", Roboto, "Noto Sans CJK SC", "Noto Sans SC", sans-serif;
  --display: var(--body);
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Roboto Mono", monospace;
  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #000000; --band: #161617; --card: #1D1D1F; --ink: #F5F5F7; --ink-2: #A1A1A6; --rule: #424245;
    --accent: #8FA8FF; --accent-hover: #A6BBFF; --accent-ink: #000000; --accent-soft: #1A263F; --mark: #74600F; --mark-ink: #FFF2C2;
    --me: #C4B2F5; --ok: #6BC398; --warn: #E3B072; --err: #F0897F; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #000000; --band: #161617; --card: #1D1D1F; --ink: #F5F5F7; --ink-2: #A1A1A6; --rule: #424245;
  --accent: #8FA8FF; --accent-hover: #A6BBFF; --accent-ink: #000000; --accent-soft: #1A263F; --mark: #74600F; --mark-ink: #FFF2C2;
  --me: #C4B2F5; --ok: #6BC398; --warn: #E3B072; --err: #F0897F; color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.65 var(--body); -webkit-font-smoothing: antialiased; }
.wrap { max-width: 1120px; margin: 0 auto; padding-inline: max(16px, env(safe-area-inset-left, 0px)); }
.col { max-width: 720px; }
a { color: var(--accent); }
h1, h2, h3 { font-family: var(--display); font-weight: 600; line-height: 1.25; text-wrap: balance; margin: 0; }
h2 { font-size: clamp(28px, 3.6vw, 44px); }
h3 { font-size: 20px; line-height: 1.4; }
p { margin: 0; }
img { max-width: 100%; height: auto; display: block; }
.eyebrow { font: 600 13px/1.4 var(--body); color: var(--ink-2); }
.en { font-family: var(--body); }
.muted { color: var(--ink-2); }
button, input, select { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* top bar */
/* 跳到正文 / Skip to content: the first stop for a keyboard, out of sight until it has focus */
.skip { position: absolute; top: 8px; left: 16px; z-index: 6; padding: 8px 14px; border-radius: 8px; background: var(--ink); color: var(--paper); font-size: 15px; font-weight: 600; text-decoration: none; transform: translateY(-300%); }
.skip:focus { transform: none; }
.bar { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--rule); }
.bar .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-block: 10px; }
/* logo: inline SVG outlines written by social/brand/make_logo.py */
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand svg { display: block; flex: none; }
.brand .dot { fill: var(--accent); }
.brand-en { color: var(--ink-2); margin-left: 2px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 22px; border-radius: 999px; border: 1px solid var(--rule); background: transparent; color: var(--ink); font-size: 16px; font-weight: 600; text-decoration: none; cursor: pointer; }
.btn.solid { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn:hover { background: var(--band); }
.btn.solid:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn:active { transform: translateY(1px); }
.btn.small { min-height: 36px; padding: 0 14px; font-size: 14px; }
.btn.quiet { border-color: transparent; color: var(--ink-2); }
.btn[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); color: var(--ink); }
.btn[disabled] { opacity: .55; cursor: default; }
.btn svg { width: 12px; height: 12px; fill: currentColor; flex: none; }

/* header: language link next to the button */
.bar .right { display: flex; align-items: center; gap: 14px; }
.lang { font-size: 14px; color: var(--ink-2); text-decoration: none; white-space: nowrap; }
.lang:hover, .lang[aria-current="page"] { color: var(--ink); }
@media (max-width: 960px) { .bar .nav-opt { display: none; } } /* .bar: beats the touch rule that makes every .lang inline-flex */

/* hero */
.hero { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 56px; align-items: start; padding-block: 80px 96px; }
.hero h1 { font-size: clamp(34px, 4.2vw, 46px); line-height: 1.2; }
html[lang="en"] .hero h1 { font-size: clamp(32px, 3.4vw, 40px); } /* English words are longer: three lines, not four */
.nw { white-space: nowrap; }
.hero .lede { margin-top: 16px; font-size: clamp(17px, 1.7vw, 21px); line-height: 1.6; color: var(--ink-2); max-width: 30em; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero .fine { margin-top: 14px; font-size: 13px; color: var(--ink-2); }

/* the live stage card */
.scene { background: var(--card); border: 1px solid var(--rule); border-radius: 18px; overflow: hidden; }
.scene-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 12px; padding: 12px 16px; border-bottom: 1px solid var(--rule); }
.scene-head b { font-size: 16px; font-weight: 600; }
.scene-head span { font-size: 13px; color: var(--ink-2); }
.stage { position: relative; aspect-ratio: 640 / 300; background: #efe6d8; }
.stage img, .stage svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.stage .turn { position: absolute; left: 50%; top: 10px; transform: translateX(-50%); padding: 4px 12px; border-radius: 999px; background: var(--accent); color: var(--accent-ink); font-size: 13px; font-weight: 600; white-space: nowrap; }
.cap { padding: 14px 16px 4px; min-height: 92px; }
.cap .who { font-size: 13px; font-weight: 600; color: var(--ink-2); }
.cap .line { font-size: 16px; line-height: 1.55; margin-top: 2px; }
.cap .zh { font-size: 14px; color: var(--ink-2); margin-top: 2px; }
.cap .hint { font-size: 15px; color: var(--ink-2); }
.scene-ctl { display: flex; flex-wrap: wrap; gap: 8px; padding: 8px 16px 14px; }
.scene-foot { padding: 0 16px 12px; font-size: 12px; color: var(--ink-2); }
.cue { border-top: 1px solid var(--rule); background: var(--accent-soft); padding: 14px 16px 16px; }
.cue h3 { font-family: var(--body); font-size: 16px; font-weight: 700; }
.cue h3 small { font-weight: 600; color: var(--ink-2); margin-left: 6px; font-size: 13px; }
.cue .ask { margin-top: 6px; font-size: 15px; }
.cue .task { margin-top: 4px; font-size: 14px; color: var(--ink-2); }
.levels { list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 6px; }
.levels li, .try-out.mine { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; align-items: baseline; background: var(--card); border: 1px solid var(--rule); border-radius: 8px; padding: 8px 10px; font-size: 14px; line-height: 1.5; }
.levels li span, .try-out.mine span:first-child { font-size: 12px; font-weight: 600; color: var(--ink-2); white-space: nowrap; }
.cue .then { margin-top: 10px; font-size: 13px; color: var(--ink-2); }
.cue .then i { font-style: normal; color: var(--ink); }
.cue .go { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin-top: 14px; font-weight: 600; }
/* 我来说这一句: the visitor says the cue line; what they said sits above the three answers, in the learner's colour */
.try { margin-top: 12px; }
.try-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.try .note { font-size: 12px; color: var(--ink-2); }
.try .hold { flex: 1 1 160px; }
/* both mic buttons are held to talk: a held finger must not select their text, open a menu or scroll the page */
.try .hold, #try-go { touch-action: none; -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
.try .hold[aria-pressed="true"] { background: var(--me); border-color: var(--me); color: var(--card); }
.try .heard { flex: 1 1 100%; font-size: 14px; color: var(--ink-2); overflow-wrap: anywhere; }
.try label { flex: 1 1 100%; font-size: 13px; font-weight: 600; }
.try input { flex: 1 1 180px; min-width: 0; min-height: 44px; padding: 8px 12px; border: 1.5px solid var(--rule); border-radius: 8px; background: var(--card); }
.try-out:not(:empty) { margin-bottom: 10px; }
.try-out:not(.mine) { font-size: 13px; color: var(--ink-2); }
.try-out.mine { border-color: var(--me); }
.try-out.mine span:first-child { color: var(--me); }

.newtag { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px 6px 6px; border-radius: 999px; background: var(--band); color: var(--ink); text-decoration: none; font-size: 14px; line-height: 1.4; }
.newtag b { padding: 2px 8px; border-radius: 999px; background: var(--ink); color: var(--paper); font-size: 12px; flex: none; }

/* sections */
section { padding-block: 112px; }
section.band { background: var(--band); }
section.band .card, section.band .shot, section.band .face, section.band .way, section.band .founder { border-color: transparent; }
.lead { margin-top: 12px; color: var(--ink-2); font-size: clamp(17px, 1.7vw, 21px); line-height: 1.6; max-width: 34em; }
.quotes { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-top: 28px; }
.quote { margin: 0; padding: 16px 18px; background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); font-size: 15px; line-height: 1.65; }
.quote span { display: block; margin-top: 10px; font: 12px/1.4 var(--mono); color: var(--ink-2); }
.source-note { margin-top: 12px; font-size: 13px; color: var(--ink-2); }
.turnline { margin-top: 28px; font-size: clamp(19px, 2.4vw, 23px); font-weight: 600; line-height: 1.5; }

/* how: one row per step, text beside a real screen */
.steps { list-style: none; margin: 48px 0 0; padding: 0; display: grid; gap: 64px; }
.step { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 48px; align-items: start; }
.step .num { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--ink); color: var(--paper); font: 600 14px/1 var(--body); margin-bottom: 12px; }
.step p { margin-top: 10px; color: var(--ink-2); }
.shot { margin: 0; background: var(--card); border: 1px solid var(--rule); border-radius: 12px; overflow: hidden; }
.shot a { display: block; }
.shot a:focus-visible { outline-offset: -3px; }
.shot figcaption { padding: 8px 14px; font-size: 12px; color: var(--ink-2); border-top: 1px solid var(--rule); }
.shot.narrow { max-width: 520px; }

/* accent wall */
.faces { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 28px; }
.face { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 4px 14px; align-items: center; text-align: left; padding: 14px; background: var(--card); border: 1px solid var(--rule); border-radius: 12px; cursor: pointer; color: var(--ink); }
.face:hover { border-color: var(--ink-2); }
.face picture { grid-row: span 2; width: 64px; height: 64px; }
.face img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }
.face .nm { font-weight: 700; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.face .nm small { font-weight: 600; font-size: 12px; color: var(--ink-2); }
.face .tag { font-size: 12px; font-weight: 600; color: var(--ink-2); background: var(--band); border-radius: 999px; padding: 1px 8px; }
.face .say { font-size: 14px; line-height: 1.5; color: var(--ink-2); }
.face .say b { color: var(--ink); font-weight: 500; }
.face .ico { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--rule); color: var(--ink); margin-left: auto; }
.face .ico svg { width: 10px; height: 10px; fill: currentColor; }
.face.on { border-color: var(--accent); background: var(--accent-soft); }
.face.on .ico { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.faces-note { margin-top: 14px; font-size: 14px; color: var(--ink-2); }

/* compare */
.cmp { margin-top: 28px; background: var(--card); border: 1px solid var(--rule); border-radius: 12px; overflow: hidden; }
.cmp-row { display: grid; grid-template-columns: 7em minmax(0, 1fr) minmax(0, 1fr); }
.cmp-row + .cmp-row { border-top: 1px solid var(--rule); }
.cmp-row > * { padding: 12px 16px; font-size: 15px; line-height: 1.6; }
.cmp-row .k { font-weight: 700; }
.cmp-row .us { background: var(--band); }
.cmp-row .them { color: var(--ink-2); }
.cmp-head > * { font-size: 13px; font-weight: 700; padding-block: 10px; }
.cmp-head .us { color: var(--ink); }

/* review */
.rv { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 28px; }
.rv .wide { grid-column: 1 / -1; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 12px; padding: 18px; min-width: 0; }
.card h3 { font-family: var(--body); font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.card > p { color: var(--ink-2); font-size: 15px; }
.card .shot { box-shadow: none; margin-top: 14px; }
.bub { display: grid; gap: 8px; margin-top: 14px; }
.bub div { max-width: 92%; padding: 9px 12px; border-radius: 12px; font-size: 15px; line-height: 1.5; }
.bub .them { background: var(--paper); border: 1px solid var(--rule); }
.bub .me { justify-self: end; background: color-mix(in srgb, var(--me) 14%, var(--card)); }
.bub b { display: block; font-size: 12px; color: var(--ink-2); }
.bub .me b { color: var(--me); } /* grey on the lavender bubble fell under 4.5:1 */
.bub .lt { font-family: var(--mono); letter-spacing: .06em; color: var(--ink-2); }
.fam { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 8px 14px; align-items: center; margin-top: 14px; }
.fam .root { grid-row: span 4; padding: 10px 12px; border-radius: 10px; background: var(--band); border: 1px solid var(--rule); text-align: center; }
.fam .root b { display: block; font-size: 17px; }
.fam .root span { font-size: 12px; color: var(--ink-2); }
.fam .rel { display: grid; grid-template-columns: 5.4em minmax(0, 1fr); gap: 8px; align-items: baseline; font-size: 15px; line-height: 1.45; }
.fam .rel i { font-style: normal; font-size: 12px; font-weight: 700; color: var(--ink-2); }
.fam .rel small { color: var(--ink-2); font-size: 13px; }
html[lang="en"] .fam .rel small { display: block; } /* English glosses are longer: under the phrase, not wrapped beside it */
.contrast { margin-top: 12px; padding: 10px 12px; border-radius: 8px; background: var(--band); font-size: 14px; line-height: 1.6; }

/* make */
.make { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 40px; align-items: start; margin-top: 28px; }
.ticks { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.ticks li { padding-left: 28px; position: relative; }
.ticks li::before { content: ""; position: absolute; left: 2px; top: .55em; width: 14px; height: 8px; border-left: 2.5px solid var(--ink-2); border-bottom: 2.5px solid var(--ink-2); transform: rotate(-45deg); }
.ticks b { display: block; }
.ticks span { color: var(--ink-2); font-size: 15px; }
.stack { display: grid; gap: 14px; }

/* connect your AI */
.conn { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: 28px; align-items: start; margin-top: 28px; }
.chat { background: var(--card); border: 1px solid var(--rule); border-radius: 14px; padding: 16px; }
.chat .top { display: flex; justify-content: space-between; gap: 8px; font-size: 12px; color: var(--ink-2); margin-bottom: 10px; }
.chat .b { max-width: 90%; padding: 9px 12px; border-radius: 12px; font-size: 15px; line-height: 1.55; margin-top: 8px; }
.chat .b.me { margin-left: auto; background: color-mix(in srgb, var(--me) 14%, var(--card)); }
.chat .b.ai { background: var(--paper); border: 1px solid var(--rule); }
.chat .b small { display: block; font-size: 12px; color: var(--ink-2); font-weight: 600; }
.chat .tool { margin-top: 8px; font: 12px/1.5 var(--mono); color: var(--ink-2); }
.chat .link { color: var(--accent); overflow-wrap: anywhere; }
.ways { display: grid; gap: 12px; }
.way { padding: 16px 18px; background: var(--card); border: 1px solid var(--rule); border-radius: 12px; }
.way h3 { font-family: var(--body); font-size: 17px; font-weight: 700; display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; }
.way h3 span { font-size: 12px; font-weight: 600; padding: 1px 8px; border-radius: 999px; background: var(--band); color: var(--ink-2); }
.way p { margin-top: 6px; color: var(--ink-2); font-size: 15px; }
/* the AI apps that connect: a wrap of chips (its own logo + name), each linking to its steps on app.kaikouqian.com/connect#<app>;
   the per-app notes live on that page and in the FAQ */
.apps { list-style: none; margin: 24px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; font-size: 15px; line-height: 1.3; }
.apps a { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 16px 0 8px; border: 1px solid var(--rule); border-radius: 999px; background: var(--card); color: var(--ink); font-weight: 600; text-decoration: none; }
.apps a:hover { border-color: var(--ink-2); }
.apps .ai-logo { border: 0; border-radius: 50%; background: var(--band); }
.apps-note { margin-top: 16px; font-size: 15px; color: var(--ink-2); }
.addr { font: 14px/1.5 var(--mono); color: var(--ink); overflow-wrap: anywhere; }
#connect .go { margin-top: 24px; }
#connect .fine { margin-top: 10px; font-size: 13px; color: var(--ink-2); }
/* the brand's own mark (img/ai/) on a quiet tile, decorative: in its colours, or for the one-colour marks (.mono,
   drawn through a mask) in the text colour, so they follow dark mode */
.ai-logo { width: 28px; height: 28px; flex: none; display: grid; place-items: center; border-radius: 7px; background: var(--paper); border: 1px solid var(--rule); color: var(--ink); font-size: 12px; font-weight: 700; line-height: 1; }
.ai-logo i { width: 18px; height: 18px; display: block; background: var(--logo) center / contain no-repeat; }
.ai-logo i.mono { background: currentColor; -webkit-mask: var(--logo) center / contain no-repeat; mask: var(--logo) center / contain no-repeat; }
.way .go { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-top: 14px; }
.way .go span { min-width: 0; font-size: 14px; color: var(--ink-2); }
.cmd { display: flex; align-items: flex-start; gap: 8px; margin-top: 10px; padding: 8px 8px 8px 12px; border-radius: 8px; background: var(--paper); border: 1px solid var(--rule); }
.cmd code { flex: 1; min-width: 0; font: 13px/1.55 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; }
.cmd .btn { min-height: 30px; padding: 0 10px; font-size: 13px; flex: none; }
.guard { list-style: none; margin: 18px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.guard li { font-size: 14px; color: var(--ink-2); padding-left: 22px; position: relative; line-height: 1.6; }
.guard li::before { content: ""; position: absolute; left: 2px; top: .45em; width: 10px; height: 12px; border: 2px solid var(--ink-2); border-radius: 2px 2px 5px 5px; }
.guard b { color: var(--ink); }

/* founder */
.founder { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 20px; margin-top: 28px; padding: 24px; background: var(--card); border: 1px solid var(--rule); border-radius: 14px; }
.founder .av { width: 56px; height: 56px; border-radius: 50%; background: var(--band); display: grid; place-items: center; color: var(--ink); }
.founder .av svg { width: 30px; height: 30px; }
.founder blockquote { margin: 0; font-size: 17px; line-height: 1.85; }
.founder blockquote p + p { margin-top: 12px; }
.founder .sig { margin-top: 12px; font-size: 14px; color: var(--ink-2); }
.status-note { margin-top: 16px; font-size: 14px; color: var(--ink-2); }

/* privacy */
.priv { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 40px; margin-top: 32px; }
.priv div { min-width: 0; }
.priv b { display: block; margin-bottom: 4px; }
.priv span { font-size: 14px; color: var(--ink-2); line-height: 1.65; display: block; }

/* waitlist */
.join { background: var(--card); border: 1px solid var(--rule); border-radius: 14px; padding: 24px; margin-top: 24px; }
.join-go { margin-top: 18px; }
.join-cn { margin-top: 36px; }
.join-cn + p { margin-top: 6px; color: var(--ink-2); }
.field { display: grid; gap: 6px; margin-bottom: 18px; min-width: 0; }
.field > label, .field legend { font-weight: 600; font-size: 15px; }
fieldset { border: 0; padding: 0; margin: 0 0 18px; min-width: 0; }
fieldset legend { padding: 0; margin-bottom: 8px; }
input[type="email"], select { width: 100%; min-height: 46px; padding: 10px 12px; border: 1.5px solid var(--rule); border-radius: 8px; background: var(--paper); }
input[type="email"]:focus, select:focus { border-color: var(--accent); }
.row2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 16px; }
.opts { display: flex; flex-wrap: wrap; gap: 8px; }
.opt { position: relative; }
.opt input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.opt span { display: inline-flex; align-items: center; min-height: 40px; padding: 6px 14px; border: 1.5px solid var(--rule); border-radius: 999px; font-size: 14px; background: var(--paper); }
.opt input:checked + span { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); font-weight: 600; }
.opt input:focus-visible + span { outline: 3px solid var(--accent); outline-offset: 2px; }
.consent { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 10px; align-items: start; font-size: 14px; color: var(--ink-2); margin-bottom: 18px; }
.consent input { width: 20px; height: 20px; margin-top: 3px; accent-color: var(--accent); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.status { margin-top: 12px; font-size: 14px; min-height: 1.5em; }
.status.err { color: var(--err); }
.done h3 { font-size: 24px; margin-bottom: 8px; }
.done h3 b { color: var(--ink); }
.done > p + p { margin-top: 8px; }
.done p { overflow-wrap: anywhere; }
.extra { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--rule); }
.extra > p { font-weight: 600; margin-bottom: 14px; }

/* faq + footer */
details { border-top: 1px solid var(--rule); padding: 14px 0; }
details:last-of-type { border-bottom: 1px solid var(--rule); }
summary { cursor: pointer; font-weight: 600; list-style-position: inside; }
details p { margin-top: 8px; color: var(--ink-2); font-size: 15px; }
footer { border-top: 1px solid var(--rule); padding-block: 32px 48px; font-size: 14px; color: var(--ink-2); }
footer .handles { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 8px; }
footer .handles span b { color: var(--ink); font-weight: 600; }
footer a { color: var(--ink-2); text-decoration: none; }
footer a:hover { color: var(--accent); text-decoration: underline; }

@media (max-width: 960px) {
  .quotes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .faces { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 28px; padding-block: 32px 36px; }
  .step, .make { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .step:nth-child(even) { grid-template-columns: minmax(0, 1fr); }
  .step:nth-child(even) .shot { order: 0; justify-self: stretch; }
  .rv, .conn, .guard { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 600px) {
  .quotes, .priv, .faces, .row2 { grid-template-columns: minmax(0, 1fr); }
  .brand .brand-en { display: none; }
  .join { padding: 18px 16px; }
  section { padding-block: 60px; }
  .cmp-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .cmp-row .k { grid-column: 1 / -1; padding-bottom: 0; }
  .cmp-head .k { display: none; }
  .founder { grid-template-columns: minmax(0, 1fr); padding: 18px 16px; }
}

/* scenario guides (guides/index.html, guides/<scene>/index.html): one article column.
   Tables stay real tables (search engines and AI read them); under 600px each row becomes a card. */
.guide { max-width: 800px; padding-block: 0 64px; }
.crumbs { padding-top: 22px; font-size: 14px; color: var(--ink-2); }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 2px 8px; }
.crumbs li + li::before { content: "/"; margin-right: 8px; }
.crumbs a { color: var(--ink-2); }
.guide h1 { font-size: clamp(30px, 4.6vw, 44px); margin-top: 14px; }
.answer { margin-top: 20px; padding: 18px 22px; background: var(--band); border-radius: var(--radius); font-size: 17px; line-height: 1.85; }
.answer b { font-weight: 700; }
.byline { display: flex; flex-wrap: wrap; gap: 2px 16px; margin-top: 14px; font-size: 14px; color: var(--ink-2); }
.byline a { color: var(--ink-2); }
.toc { margin-top: 28px; padding: 14px 20px 16px; border: 1px solid var(--rule); border-radius: var(--radius); }
.toc b { font-size: 14px; color: var(--ink-2); }
.toc ol { margin: 6px 0 0; padding-left: 1.5em; display: grid; gap: 2px; font-size: 15px; }
.guide section { padding-block: 48px 0; border-top: 0; }
.guide h2 { font-size: clamp(23px, 3vw, 29px); scroll-margin-top: 72px; }
.guide h2 + p { margin-top: 10px; }
.guide section > p + p { margin-top: 12px; }
.guide .src { margin-top: 10px; font-size: 13px; color: var(--ink-2); }
.guide [lang="en"] { overflow-wrap: anywhere; }
.guide mark { background: var(--mark); color: var(--mark-ink); padding: 0 .1em; border-radius: 2px; }
.tw { margin-top: 18px; background: var(--card); border: 1px solid var(--rule); border-radius: 12px; overflow: hidden; }
.tbl { width: 100%; border-collapse: collapse; table-layout: fixed; font-size: 15px; line-height: 1.6; }
.tbl th, .tbl td { padding: 10px 14px; text-align: left; vertical-align: top; border-top: 1px solid var(--rule); overflow-wrap: anywhere; }
.tbl thead th { border-top: 0; font-size: 13px; color: var(--ink-2); }
.tbl .grp th { background: var(--band); font-size: 14px; }
.t-steps .c1 { width: 56%; }
.t-mist .c1 { width: 27%; } .t-mist .c2 { width: 34%; }
.t-rescue .c1 { width: 22%; } .t-rescue .c2 { width: 44%; }
.t-say .c1 { width: 34%; } .t-say .c2 { width: 22%; }
.t-say.long-1 .c1 { width: 50%; } .t-say.long-1 .c2 { width: 20%; }
.t-say.long-2 .c1 { width: 22%; } .t-say.long-2 .c2 { width: 44%; }
.tbl tbody th { font-size: 14px; }
.t-say td { vertical-align: middle; }
.tbl .grp small { font-weight: 400; font-size: 13px; color: var(--ink-2); margin-left: 8px; } /* the browser's smaller made it 11.7 px */
.tbl .en-l { font-weight: 600; }
.tbl .zh-l, .tbl .why { color: var(--ink-2); }
.tbl .bad { color: var(--err); }
.tbl .good { color: var(--ok); font-weight: 600; }
.say { display: flex; flex-wrap: wrap; gap: 6px; }
.say button { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 0 12px; border-radius: 999px; border: 1.5px solid var(--rule); background: var(--paper); color: var(--ink); font-size: 13px; font-weight: 600; cursor: pointer; }
.say button:hover { border-color: var(--accent); }
.say button svg { width: 9px; height: 9px; fill: var(--ink-2); flex: none; }
.say button.on { border-color: var(--accent); background: var(--accent-soft); }
.dlg { margin-top: 18px; display: grid; gap: 8px; }
.dlg .ln { display: grid; grid-template-columns: 4.6em minmax(0, 1fr); gap: 4px 12px; padding: 12px 16px; background: var(--card); border: 1px solid var(--rule); border-radius: 12px; }
.dlg .ln.me { background: color-mix(in srgb, var(--me) 6%, var(--card)); }
.dlg .who { font-size: 13px; font-weight: 700; color: var(--ink-2); line-height: 1.9; }
.dlg .me .who { color: var(--me); }
.dlg .en-l { line-height: 1.6; }
.dlg .zh-l { margin-top: 2px; font-size: 14px; color: var(--ink-2); }
.dlg .step { display: inline-block; margin-top: 6px; padding: 0 8px; border-radius: 999px; background: var(--band); color: var(--ink); font-size: 12px; font-weight: 600; }
.reg { margin-top: 16px; padding: 16px 18px; background: var(--card); border: 1px solid var(--rule); border-radius: 12px; }
.reg h3 { font-family: var(--body); font-size: 16px; font-weight: 700; }
.reg h3 span { font-weight: 400; color: var(--ink-2); }
.reg .levels li { grid-template-columns: 3.4em minmax(0, 1fr); background: var(--paper); font-size: 15px; }
.cta-box { margin-top: 18px; padding: 24px; background: var(--band); border-radius: 18px; }
.cta-box .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.cta-box .fine { margin-top: 12px; font-size: 13px; color: var(--ink-2); }
.facts { display: grid; grid-template-columns: 6em minmax(0, 1fr); gap: 8px 16px; margin: 18px 0 0; font-size: 15px; }
.facts dt { font-weight: 700; }
.facts dd { margin: 0; color: var(--ink-2); }
.gcards { list-style: none; margin: 24px 0 0; padding: 0; display: grid; gap: 14px; }
.gcard a { display: block; padding: 18px 20px; background: var(--card); border: 1px solid var(--rule); border-radius: 12px; color: var(--ink); text-decoration: none; }
.gcard a:hover { border-color: var(--ink-2); }
.gcard h3 { font-size: 21px; }
.gcard p { margin-top: 6px; color: var(--ink-2); font-size: 15px; }
.gcard .meta { margin-top: 10px; font-size: 13px; }
.soon { list-style: none; margin: 14px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.soon li { padding: 4px 12px 4px 0; font-size: 14px; color: var(--ink-2); }
/* creators/kit/: the creators' 素材包 (tables reuse .tbl; images and faces in grids that fill the column) */
.t-facts .c1 { width: 20%; }
.t-dos .c1 { width: 34%; } .t-dos .c2 { width: 34%; }
.t-tags .c1 { width: 24%; }
.guide .tw + p, .kit-list + p { margin-top: 16px; }
.kit-list { margin-top: 18px; }
.kit-h3 { margin-top: 32px; font-size: 20px; }
.kit-shots { list-style: none; margin: 18px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 230px), 1fr)); gap: 14px; }
.kit-shots .shot { height: 100%; display: flex; flex-direction: column; }
.kit-shots img { display: block; width: 100%; height: 170px; object-fit: cover; object-position: left top; }
.kit-shots figcaption { flex: 1; font-size: 13px; line-height: 1.6; }
.kit-shots figcaption b { display: block; font-size: 14px; color: var(--ink); }
.kit-shots .path { margin-top: 4px; color: var(--ink-2); overflow-wrap: anywhere; }
.kit-faces { list-style: none; margin: 14px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(88px, 1fr)); gap: 12px; text-align: center; font-size: 14px; }
.kit-faces img { display: block; width: 100%; max-width: 96px; height: auto; aspect-ratio: 1; margin: 0 auto 6px; border: 1px solid var(--rule); border-radius: 12px; }
@media (max-width: 600px) {
  .answer { padding: 14px 16px; font-size: 16px; }
  .tbl thead { display: none; }
  .tbl, .tbl tbody, .tbl tr, .tbl th, .tbl td { display: block; }
  .tbl tr { padding: 10px 14px; border-top: 1px solid var(--rule); }
  .tbl tbody tr:first-child { border-top: 0; }
  .tbl th, .tbl td { padding: 2px 0; border-top: 0; }
  .tbl .grp { padding: 8px 14px; background: var(--band); }
  .tbl .grp th { background: none; }
  .tbl .grp small { display: block; margin-left: 0; }
  .tbl td[data-k]::before { content: attr(data-k); display: block; margin-top: 4px; font-size: 12px; font-weight: 700; color: var(--ink-2); }
  .tbl td.say-cell { padding-top: 8px; }
  .dlg .ln { grid-template-columns: minmax(0, 1fr); padding: 10px 14px; }
  .dlg .who { line-height: 1.4; }
  .reg { padding: 14px; }
  .cta-box { padding: 18px 16px; }
  .facts { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .facts dd + dt { margin-top: 10px; }
}

/* fragment jumps and Shift+Tab land below the sticky bar, not under it */
html { scroll-padding-top: 72px; }
/* a long unbroken typed answer wraps instead of being clipped */
.try-out.mine { overflow-wrap: anywhere; }
/* fingers: every tap target at least 44 px tall */
@media (pointer: coarse) {
  .btn.small, .cmd .btn, .say button, .opt span { min-height: 44px; }
  .lang { display: inline-flex; align-items: center; min-height: 44px; }
  details { padding: 6px 0; } summary { padding-block: 8px; }
}
/* read out, not shown (the comparison table's first header cell) */
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
/* phones: the headline clearly above the section titles (30 vs 26 px was a 1.15 step) */

/* redesign 2026-10-31: the big play button on the hero picture, folded extras, the small link rows */
.big-play { position: absolute; left: 50%; top: 50%; z-index: 2; transform: translate(-50%, -50%); display: inline-flex; align-items: center; gap: 12px;
  min-height: 56px; padding: 0 24px 0 8px; border: 0; border-radius: 999px; background: rgba(22, 22, 24, .74); color: #fff; font-weight: 600; font-size: 17px;
  cursor: pointer; -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
.big-play svg { position: static; width: 40px; height: 40px; padding: 13px 11px 13px 15px; border-radius: 50%; background: #fff; fill: #161618; flex: none; } /* static: .stage svg fills the stage */
.big-play:hover { background: rgba(22, 22, 24, .86); }
.big-play:focus-visible { outline: 3px solid #fff; outline-offset: 3px; }
details.fold, details.fold:last-of-type { margin-top: 40px; border: 0; padding: 0; }
.fold > summary { display: inline-flex; align-items: center; min-height: 44px; padding: 0 20px; border: 1px solid var(--rule); border-radius: 999px; background: var(--card); list-style: none; }
.fold > summary::-webkit-details-marker { display: none; }
.fold > summary::after { content: "+"; margin-left: 10px; font-weight: 400; color: var(--ink-2); }
.fold[open] > summary::after { content: "–"; }
.fold > .lead { margin-top: 20px; }
.more-link { margin-top: 40px; }
.more-link a, .go a:not(.btn) { font-weight: 600; text-decoration: none; }
.more-link a::after { content: " →"; }
.newline { margin-top: 20px; }
#privacy .h-founder { margin-top: 72px; }
.join-cn { margin-top: 48px; }
.join-cn > summary { white-space: normal; text-align: left; }
/* step 3: the feedback written out (as a picture it was unreadable on phones and a white block in dark mode) */
.fb-body { padding: 16px 18px 4px; font-size: 15px; line-height: 1.6; }
.fb-body > p, .fb-fix > p { margin: 0; color: var(--ink); }
.fb-body > .fb-h { font-weight: 600; }
.fb-body > .fb-good { margin-top: 6px; }
.fb-fix { margin: 12px 0; padding: 12px 14px; border: 1px solid var(--rule); border-radius: 10px; }
.fb-fix > .fb-was, .fb-fix > .fb-why { color: var(--ink-2); font-size: 14px; }
.fb-fix > .fb-now { margin-top: 4px; font-weight: 600; font-size: 16px; line-height: 1.45; }
.fb-fix > .fb-why { margin-top: 6px; }
/* dark mode: the light screenshots dimmed instead of glaring (web.dev's prefers-color-scheme advice) */
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .shot img { filter: brightness(.8) contrast(1.2); } }
:root[data-theme="dark"] .shot img { filter: brightness(.8) contrast(1.2); }
.m-only { display: none; }
@media (max-width: 600px) {
  .priv { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .big-play { min-height: 52px; font-size: 16px; }
  .m-only { display: block; }
  /* phones: the accent wall scrolls sideways, one card and the edge of the next, instead of six cards stacked */
  .faces { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; gap: 12px; margin-inline: -16px; padding: 2px 16px 10px; scroll-padding-inline: 16px; }
  .face { flex: 0 0 84%; scroll-snap-align: start; align-content: start; }
  .face picture { grid-row: auto; width: 48px; height: 48px; }
  .face .say { grid-column: 1 / -1; margin-top: 6px; }
  .fam .rel small { display: block; } /* a narrow card: the gloss under its phrase, not broken beside it */
  #privacy .h-founder { margin-top: 56px; }
}