/* BotoBot — public site v2.
   Direction: "two helpers across a bridge" — a warm, flat, poster-illustrated
   product page. Thick ink outlines and hard offset shadows (no soft blur),
   two confident accents (vermilion + deep green) over warm off-white. Friendly
   geometric "assistant" tiles, a sealed envelope, a lock-bearing hub.
   Display/UI: Instrument Sans (Noto Sans TC for zh); character accent: Fraunces
   (Noto Serif TC for zh) for the wordmark and large step numerals. */

/* ---- fonts (self-hosted, subset) ---------------------------------------- */
@font-face{font-family:"Fraunces";src:url("/fonts/fraunces.woff2") format("woff2");
  font-weight:440;font-style:normal;font-display:swap}
@font-face{font-family:"Instrument Sans";src:url("/fonts/instrument-sans.woff2") format("woff2");
  font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Instrument Sans";src:url("/fonts/instrument-sans-sb.woff2") format("woff2");
  font-weight:600;font-style:normal;font-display:swap}
/* zh display (serif, for wordmark + numerals) */
@font-face{font-family:"Noto Serif TC Sub";src:url("/fonts/noto-serif-tc.woff2") format("woff2");
  font-weight:400;font-style:normal;font-display:swap;unicode-range:U+2E80-FFFF,U+3000-30FF,U+FF00-FFEF,U+3400-4DBF}
/* zh body + UI + headings */
@font-face{font-family:"Noto Sans TC Sub";src:url("/fonts/noto-sans-tc.woff2") format("woff2");
  font-weight:400;font-style:normal;font-display:swap;unicode-range:U+2014-2015,U+2026,U+2E80-FFFF,U+3000-30FF,U+FF00-FFEF,U+3400-4DBF}

/* ---- tokens -------------------------------------------------------------- */
:root{
  --paper:#f3ede1;       /* warm off-white ground */
  --paper-2:#ece1cd;     /* banded sections */
  --surface:#fbf7ef;     /* lifted cards */
  --ink:#1f1b15;         /* near-black warm ink */
  --ink-2:#564d3e;       /* secondary text */
  --ink-3:#847a69;       /* meta / captions */
  --rule:#ddd1ba;        /* hairline on paper */
  --rule-2:#cabda2;
  --vermilion:#e24e1b;   /* primary accent */
  --vermilion-ink:#b93c10;
  --green:#15624a;       /* secondary accent */
  --green-ink:#0d4b37;
  --gold:#ecb23e;        /* seal / highlight */

  --shadow:5px 6px 0 var(--ink);     /* hard offset shadow — the signature */
  --shadow-sm:3px 4px 0 var(--ink);
  --shadow-lg:8px 10px 0 var(--ink);

  --sans:"Instrument Sans","Noto Sans TC Sub",system-ui,-apple-system,"Segoe UI",sans-serif;
  --serif:"Fraunces","Noto Serif TC Sub",Georgia,serif;

  --edge:clamp(20px,5vw,72px);
  --maxw:1200px;
  --r:18px;              /* default radius */
  --r-lg:26px;
}

/* ---- reset / base -------------------------------------------------------- */
*{box-sizing:border-box}
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-family:var(--sans);font-size:1.0625rem;line-height:1.62;font-weight:400;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
:lang(zh-Hant-TW) body{font-size:1.09rem;line-height:1.78}
@media(max-width:560px){:lang(zh-Hant-TW) body{font-size:1.03rem}}
p{margin:0;text-wrap:pretty}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--vermilion-ink);text-underline-offset:.16em;text-decoration-thickness:.08em}
a:hover{color:var(--vermilion)}
b{font-weight:600;color:var(--ink)}
:focus-visible{outline:3px solid var(--vermilion);outline-offset:3px;border-radius:4px}
::selection{background:#f6d9ab;color:var(--ink)}

h1,h2,h3{margin:0;font-weight:600;line-height:1.08;letter-spacing:-.02em;text-wrap:balance;word-break:keep-all}
:lang(zh-Hant-TW) h1,:lang(zh-Hant-TW) h2,:lang(zh-Hant-TW) h3{letter-spacing:-.005em;line-height:1.26}

.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--edge);width:100%}

.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:var(--surface);
  padding:10px 16px;border-radius:0 0 12px 0;z-index:100}
.skip:focus{left:0}

/* ---- buttons / brand ----------------------------------------------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font:inherit;font-weight:600;cursor:pointer;
  background:var(--vermilion);color:#fff;
  border:3px solid var(--ink);border-radius:999px;
  padding:.72em 1.4em;box-shadow:var(--shadow-sm);
  transition:transform .12s ease,box-shadow .12s ease,background .12s ease;
  text-decoration:none;line-height:1;white-space:nowrap}
.btn:hover{color:#fff;background:var(--vermilion);transform:translate(-2px,-2px);box-shadow:5px 6px 0 var(--ink)}
.btn:active{transform:translate(1px,2px);box-shadow:1px 2px 0 var(--ink)}
.btn-sm{padding:.55em 1.05em;font-size:.95rem;box-shadow:var(--shadow-sm)}
.btn.copy[data-copied]{background:var(--green);color:#fff}

.brand{display:inline-flex;align-items:center;gap:.5rem;text-decoration:none;color:var(--ink)}
.brand:hover{color:var(--ink)}
.brand-name{font-family:var(--serif);font-weight:440;font-size:1.5rem;letter-spacing:-.01em}
.brand-mark{flex:none}

/* small informational pills (not tracked-caps eyebrows) */
.flags{display:flex;flex-wrap:wrap;gap:.5rem;margin:0 0 1.4rem}
.flag{display:inline-flex;align-items:center;gap:.4em;font-size:.82rem;font-weight:600;
  padding:.36em .8em;border-radius:999px;border:2px solid var(--ink);line-height:1}
.flag::before{content:"";width:.5em;height:.5em;border-radius:50%;background:currentColor}
.flag-beta{background:#fbe9c9;color:var(--vermilion-ink)}
.flag-grok{background:var(--surface);color:var(--green-ink)}

.nowrap{white-space:nowrap}

/* Animated wordmark lockup: "Bot·to·Bot" morphs to "BotoBot" once on load.
   No-JS / reduced-motion show the final "BotoBot". */
.wm-lockup{display:flex;align-items:baseline;gap:.55rem;margin:0 0 1rem;flex-wrap:wrap}
.wm-morph{display:inline-grid;font-family:var(--serif);font-weight:440;font-size:1.45rem;line-height:1;color:var(--ink)}
.wm-phase{grid-area:1/1;white-space:nowrap}
.wm-tag{font-size:.8rem;font-weight:600;color:var(--ink-3)}
.wm-expanded{opacity:0}
.wm-name{opacity:1}
html.js:not(.reduce) .wm-expanded{opacity:1}
html.js:not(.reduce) .wm-name{opacity:0}

/* ---- header -------------------------------------------------------------- */
.site-head{position:sticky;top:0;z-index:50;background:rgba(243,237,225,.82);
  backdrop-filter:saturate(1.1) blur(8px);border-bottom:2px solid var(--ink)}
.head-row{display:flex;align-items:center;gap:1.2rem;min-height:66px}
.site-nav{display:flex;gap:1.5rem;margin-left:auto}
.site-nav a{color:var(--ink);text-decoration:none;font-weight:600;font-size:.98rem}
.site-nav a:hover{color:var(--vermilion-ink)}
.head-end{display:flex;align-items:center;gap:1rem}
.lang{display:inline-flex;align-items:center;gap:.5rem;font-weight:600;font-size:.95rem}
.lang a{color:var(--ink-2);text-decoration:none}
.lang a[aria-current]{color:var(--ink)}
.lang a:hover{color:var(--vermilion-ink)}
.lang-sep{width:1px;height:14px;background:var(--rule-2)}
@media(max-width:860px){.site-nav{display:none}}
@media(max-width:420px){
  .head-row{gap:.55rem;min-height:58px}
  .head-end{gap:.6rem}
  .btn-sm{padding:.5em .82em;font-size:.84rem}
  .brand-name{font-size:1.28rem}
  .lang{font-size:.92rem;gap:.42rem}
}

/* ---- section rhythm ------------------------------------------------------ */
main>section{padding-block:clamp(64px,9vw,120px)}
.band{background:var(--paper-2);border-block:2px solid var(--ink)}
.sec-head{max-width:40rem;margin:0 auto clamp(40px,5vw,64px);text-align:center}
.sec-head-left{margin-inline:0;text-align:left}
.sec-head h2{font-size:clamp(1.9rem,4.4vw,3rem)}
.sec-sub{margin-top:1rem;color:var(--ink-2);font-size:1.1rem}
:lang(zh-Hant-TW) .sec-sub{font-size:1.12rem}

/* ---- hero ---------------------------------------------------------------- */
.hero{padding-top:clamp(40px,6vw,76px);padding-bottom:clamp(56px,7vw,96px)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.14fr) minmax(0,1fr);
  gap:clamp(28px,4vw,60px);align-items:center}
/* Phrase-break headline: each clause is its own line. zh phrases never break
   mid-character (nowrap) and are sized so the widest fits 320-1440px; English
   clauses may wrap at spaces on very narrow screens (whole words only). */
.hero-h1 .ph{display:block;white-space:nowrap}
:lang(en) .hero-h1 .ph{white-space:normal}
.hero-copy h1{font-size:clamp(1.6rem,8.2vw,3.2rem)}
:lang(en) .hero-copy h1{font-size:clamp(1.7rem,6vw,2.6rem)}
.hero-copy h1 em{font-style:normal;color:var(--vermilion)}
.lead{margin-top:1.3rem;font-size:clamp(1.08rem,1.6vw,1.3rem);color:var(--ink-2);max-width:34ch}
:lang(zh-Hant-TW) .lead{max-width:26em;text-wrap:pretty}

.cta-card{margin-top:2rem;background:var(--surface);border:3px solid var(--ink);
  border-radius:var(--r-lg);box-shadow:var(--shadow);padding:1.3rem 1.4rem;max-width:44rem}
.cta-label{font-weight:600;font-size:.98rem;color:var(--ink-2);margin-bottom:.7rem}
.cta-line{display:flex;gap:.8rem;align-items:stretch;flex-wrap:wrap}
.instr{flex:1 1 15rem;min-width:0;display:block;
  font-family:var(--sans);font-weight:600;font-size:1.02rem;color:var(--ink);
  background:var(--paper);border:2px dashed var(--rule-2);border-radius:14px;
  padding:.72em .9em;overflow-wrap:anywhere;line-height:1.55;text-wrap:pretty}
.cta-foot{margin-top:.9rem;font-size:.95rem;color:var(--ink-3)}

.hero-stage{position:relative;width:100%;aspect-ratio:13/11;
  background:var(--surface);border:3px solid var(--ink);border-radius:var(--r-lg);
  box-shadow:var(--shadow-lg);overflow:hidden}
.hero-stage::before{content:"";position:absolute;inset:0;
  background-image:radial-gradient(var(--rule) 1.4px,transparent 1.4px);
  background-size:22px 22px;opacity:.5}
.hero-canvas,.hero-fallback{position:absolute;inset:0;margin:0}
.hero-canvas{z-index:2;opacity:0;transition:opacity .5s ease}
.hero-canvas canvas{width:100%!important;height:100%!important;display:block}
.hero-fallback{z-index:1;display:grid;place-items:center;padding:6%}
.hero-fallback svg{width:100%;height:100%}
.hero-stage.hero-live .hero-canvas{opacity:1}
.hero-stage.hero-live .hero-fallback{opacity:0}
.stage-cap{position:absolute;left:0;right:0;bottom:.7rem;z-index:3;text-align:center;
  font-size:.82rem;color:var(--ink-3);padding-inline:1rem}
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .hero-stage{aspect-ratio:3/2;max-width:560px;margin-inline:auto;order:-1}
  .lead,.cta-card{max-width:none}
}

/* ---- story / steps ------------------------------------------------------- */
.story-track{position:relative}
.story-wire{position:absolute;left:0;right:0;top:46px;height:48px;z-index:0;pointer-events:none}
.wire-base,.wire-fill{position:absolute;top:50%;height:4px;border-radius:2px;transform:translateY(-50%)}
.wire-base{left:8%;right:8%;background:var(--rule)}
.wire-fill{left:8%;width:0;background:var(--vermilion);max-width:84%}
.wire-envelope{position:absolute;top:50%;left:8%;transform:translate(-50%,-50%);
  filter:drop-shadow(2px 3px 0 rgba(31,27,21,.18))}
.steps{list-style:none;margin:0;padding:0;position:relative;z-index:1;
  display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,3vw,34px)}
.step{background:var(--surface);border:3px solid var(--ink);border-radius:var(--r-lg);
  box-shadow:var(--shadow);padding:1.6rem 1.5rem 1.7rem;position:relative}
.step-n{position:absolute;top:-22px;left:24px;width:46px;height:46px;border-radius:50%;
  display:grid;place-items:center;background:var(--ink);color:var(--surface);
  font-family:var(--serif);font-weight:440;font-size:1.5rem;border:3px solid var(--ink)}
.step-fig{width:96px;height:96px;margin:.6rem 0 1.1rem}
.step-fig svg{width:100%;height:100%}
.step h3{font-size:1.3rem;margin-bottom:.6rem}
.step p{color:var(--ink-2)}
.step[data-active] .step-n{background:var(--vermilion)}
.agentnote{margin-top:clamp(36px,4vw,52px);text-align:center;color:var(--ink-3);font-size:.95rem}
@media(max-width:780px){
  .steps{grid-template-columns:1fr;gap:34px}
  .story-wire{display:none}
  .step-n{left:20px}
}

/* ---- privacy ------------------------------------------------------------- */
.privacy-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:clamp(28px,4vw,56px);
  align-items:center}
.privacy-stage{margin:0;background:var(--surface);border:3px solid var(--ink);
  border-radius:var(--r-lg);box-shadow:var(--shadow);padding:1.3rem}
.privacy-stage svg{width:100%;height:auto}
.pv-t{font-family:var(--sans);font-size:13px;font-weight:600;fill:var(--ink-2)}
.privacy-list{list-style:none;margin:0;padding:0;display:grid;gap:1.15rem}
.privacy-list li{display:flex;gap:1rem;align-items:flex-start}
.privacy-list p{color:var(--ink-2)}
.pm{flex:none;width:40px;height:40px;border-radius:12px;border:2.5px solid var(--ink);
  background:var(--surface);position:relative;box-shadow:var(--shadow-sm)}
.pm::before,.pm::after{content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%)}
.pm[data-ic="lock"]{background:var(--vermilion)}
.pm[data-ic="lock"]::before{width:15px;height:11px;border-radius:3px;background:var(--surface);margin-top:3px}
.pm[data-ic="lock"]::after{width:11px;height:11px;border:2.5px solid var(--surface);border-bottom:none;border-radius:6px 6px 0 0;margin-top:-6px}
.pm[data-ic="relay"]::before{width:18px;height:3px;background:var(--ink);box-shadow:0 -6px 0 var(--green),0 6px 0 var(--vermilion)}
.pm[data-ic="burn"]{background:#fbe9c9}
.pm[data-ic="burn"]::before{width:0;height:0;border-left:7px solid transparent;border-right:7px solid transparent;border-top:13px solid var(--vermilion);margin-top:-2px}
.pm[data-ic="burn"]::after{width:8px;height:8px;border-radius:50% 50% 50% 0;background:var(--gold);transform:translate(-50%,-80%) rotate(45deg)}
.pm[data-ic="key"]{background:var(--green)}
.pm[data-ic="key"]::before{width:10px;height:10px;border:2.5px solid var(--surface);border-radius:50%;margin-left:-5px}
.pm[data-ic="key"]::after{width:11px;height:2.6px;background:var(--surface);margin-left:6px}
.fineprint{margin-top:clamp(28px,3vw,40px);text-align:center;color:var(--ink-3);
  max-width:46rem;margin-inline:auto}
@media(max-width:820px){.privacy-grid{grid-template-columns:1fr}}

/* ---- uses / bento -------------------------------------------------------- */
.bento{display:grid;grid-template-columns:repeat(6,1fr);gap:clamp(16px,2vw,24px)}
.bento-card{background:var(--surface);border:3px solid var(--ink);border-radius:var(--r-lg);
  box-shadow:var(--shadow);padding:1.5rem 1.5rem 1.6rem;
  grid-column:span 2;display:flex;flex-direction:column;
  transition:transform .14s ease,box-shadow .14s ease}
.bento-card:hover{transform:translate(-3px,-3px);box-shadow:var(--shadow-lg)}
.c-sync{grid-column:span 3}
.c-approve{grid-column:span 3;background:var(--green);color:var(--surface);border-color:var(--ink)}
.bento-card.c-approve h3{color:#fff}
.bento-card.c-approve p{color:#e8efe9}
.c-file{grid-column:span 2}
.c-time{grid-column:span 2}
.c-quote{grid-column:span 2}
.bento-ic{width:64px;height:64px;margin-bottom:1rem}
.c-approve .bento-ic{filter:drop-shadow(0 0 0 transparent)}
.bento-card h3{font-size:1.3rem;margin-bottom:.5rem}
.bento-card p{color:var(--ink-2)}
@media(max-width:860px){
  .bento{grid-template-columns:1fr 1fr}
  .bento-card,.c-sync,.c-approve,.c-file,.c-time,.c-quote{grid-column:auto}
}
@media(max-width:560px){.bento{grid-template-columns:1fr}}

/* ---- control ------------------------------------------------------------- */
.control-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,72px);align-items:center}
.control-list{list-style:none;margin:1.6rem 0 0;padding:0;display:grid;gap:1.05rem}
.control-list li{position:relative;padding-left:2.1rem;color:var(--ink-2)}
.control-list li::before{content:"";position:absolute;left:0;top:.28em;width:18px;height:18px;
  border-radius:6px;background:var(--green);border:2px solid var(--ink)}
.control-list li::after{content:"";position:absolute;left:4px;top:.52em;width:9px;height:5px;
  border-left:2.6px solid var(--surface);border-bottom:2.6px solid var(--surface);
  transform:rotate(-45deg)}
.control-fig{margin:0}
.control-fig svg{width:100%;height:auto;max-width:420px;margin-inline:auto}
.cf-t{font-family:var(--sans);font-size:15px;font-weight:600}
@media(max-width:820px){.control-grid{grid-template-columns:1fr}.control-fig{order:-1;max-width:360px;margin-inline:auto}}

/* ---- faq ----------------------------------------------------------------- */
.faq-wrap{max-width:52rem}
.faq-list{margin-top:1.8rem;border-top:2px solid var(--ink)}
.faq details{border-bottom:2px solid var(--ink)}
.faq summary{list-style:none;cursor:pointer;padding:1.15rem .4rem;font-weight:600;
  font-size:1.12rem;display:flex;align-items:center;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";margin-left:auto;flex:none;width:14px;height:14px;
  border-right:2.6px solid var(--ink);border-bottom:2.6px solid var(--ink);
  transform:rotate(45deg);transition:transform .2s ease}
.faq details[open] summary::after{transform:rotate(-135deg)}
.faq summary:hover{color:var(--vermilion-ink)}
.faq-a{padding:0 .4rem 1.2rem}
.faq-a p{color:var(--ink-2)}

/* ---- final cta ----------------------------------------------------------- */
.cta-final{background:var(--ink);color:var(--surface);border-top:3px solid var(--ink)}
.cta-final-inner{text-align:center;max-width:46rem}
.cta-final h2{font-size:clamp(1.9rem,4.4vw,3rem);color:var(--surface)}
.cta-card-lg{margin-inline:auto;margin-top:2rem;background:var(--surface);color:var(--ink);
  box-shadow:8px 10px 0 rgba(0,0,0,.35);max-width:none}
.cta-final .instr{color:var(--ink)}

/* ---- footer -------------------------------------------------------------- */
.site-foot{background:var(--paper-2);border-top:2px solid var(--ink);padding-block:clamp(40px,5vw,64px)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem;align-items:start}
.foot-tag{margin-top:.8rem;color:var(--ink-2);max-width:26ch;font-size:.98rem}
.foot-links{display:flex;flex-direction:column;gap:.55rem}
.foot-h{font-weight:600;color:var(--ink);font-size:.82rem;opacity:.65;margin-bottom:.15rem}
.foot-links a{color:var(--ink);text-decoration:none;font-weight:600}
.foot-links a:hover{color:var(--vermilion-ink)}
.foot-end{display:flex;flex-direction:column;gap:.8rem;align-items:flex-start}
.foot-copy{color:var(--ink-3);font-size:.9rem}
@media(max-width:720px){.foot-grid{grid-template-columns:1fr 1fr}.foot-brand{grid-column:1/-1}}
@media(max-width:460px){.foot-grid{grid-template-columns:1fr}}

/* ---- motion: progressive-enhancement reveals ----------------------------- */
/* Hidden start-states apply only when JS is active AND motion is allowed, so
   no-JS and reduced-motion visitors always see the final, readable layout. */
html.js:not(.reduce) [data-rise]{opacity:0;transform:translateY(22px)}
html.js:not(.reduce) [data-rise].in{opacity:1;transform:none;
  transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.2,1)}
html.js:not(.reduce) .step{opacity:0;transform:translateY(24px)}
html.js:not(.reduce) .step.in{opacity:1;transform:none;
  transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.2,1)}

@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;scroll-behavior:auto!important}
}

@media (max-width:560px){.stage-cap{display:none}}
@media (max-width:380px){.instr .nowrap{white-space:normal}.instr{overflow-wrap:anywhere}.instr .nowrap:last-child{white-space:nowrap}}