*,*::before,*::after{box-sizing:border-box}body{margin:0}

:root{
  --paper:#F5F3F1; --surface:#FFFFFF; --surface-2:#EDE8E4; --sunken:#F0EBE7;
  --ink:#1A1614; --ink-2:#6B615B; --ink-3:#9A8F88;
  --rule:#DFD8D3; --rule-2:#C4BAB3;
  --accent:#A83228; --accent-2:#8E2A21; --accent-soft:#F4E2DF;
  --ok:#2C6B4E; --warn:#8A6320;
  --fd:"Noto Serif SC","Songti SC","Source Han Serif SC",serif;
  --fb:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  --fm:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,"PingFang SC","Microsoft YaHei",monospace;
  --w:min(100%,66rem);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#141110; --surface:#1C1817; --surface-2:#272120; --sunken:#100D0C;
    --ink:#EFE9E5; --ink-2:#A79C95; --ink-3:#7B706A;
    --rule:#332B29; --rule-2:#4A403C;
    --accent:#E1685A; --accent-2:#EE8577; --accent-soft:#3A211D;
    --ok:#6FBF95; --warn:#D2A554;
  }
}
:root[data-theme="dark"]{
  --paper:#141110; --surface:#1C1817; --surface-2:#272120; --sunken:#100D0C;
  --ink:#EFE9E5; --ink-2:#A79C95; --ink-3:#7B706A;
  --rule:#332B29; --rule-2:#4A403C;
  --accent:#E1685A; --accent-2:#EE8577; --accent-soft:#3A211D;
  --ok:#6FBF95; --warn:#D2A554;
}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--fb);
  font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
.wrap{width:var(--w);margin:0 auto;padding:0 1.5rem}
h1,h2,h3,h4{font-family:var(--fd);font-weight:700;text-wrap:balance;margin:0;line-height:1.35}
p{margin:0}
a{color:var(--accent-2);text-underline-offset:3px;text-decoration-thickness:1px}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
code{font-family:var(--fm);font-size:.86em;background:var(--surface-2);padding:.1em .35em;border-radius:3px}

/* ---------- eyebrow / labels ---------- */
.eyebrow{font-family:var(--fm);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-3);font-weight:500}

/* ---------- evidence grade mark ---------- */
.grade{display:inline-flex;align-items:center;gap:.42em;font-family:var(--fm);font-size:.72rem;
  letter-spacing:.02em;white-space:nowrap;vertical-align:.05em}
.grade .bars{display:inline-flex;gap:2px}
.grade i{display:block;width:5px;height:11px;border:1px solid currentColor}
.grade[data-g="1"]{color:var(--ink)}
.grade[data-g="2"]{color:var(--ink-2)}
.grade[data-g="3"]{color:var(--ink-3)}
.grade[data-g="1"] i{background:currentColor}
.grade[data-g="2"] i:nth-child(-n+2){background:currentColor}
.grade[data-g="3"] i:nth-child(1){background:currentColor}
.grade[data-g="3"] i:nth-child(n+2){border-style:dashed}

/* ---------- hero ---------- */
header.hero{border-bottom:1px solid var(--rule);background:var(--surface);}
.hero-in{padding:4.5rem 1.5rem 3rem}
.hero h1{font-size:clamp(2.4rem,6vw,3.9rem);letter-spacing:-.01em}
.hero .ver{font-family:var(--fm);color:var(--accent);font-size:1rem;letter-spacing:.06em;display:block;margin-top:.7rem}
.hero .lede{font-size:clamp(1.05rem,2.2vw,1.24rem);color:var(--ink-2);max-width:44ch;margin-top:1.6rem;line-height:1.75}
.thesis{margin-top:2.4rem;padding:1.15rem 0 1.15rem 1.3rem;border-left:3px solid var(--accent);max-width:52ch}
.thesis strong{font-family:var(--fd)}
.hero-meta{margin-top:2.6rem;padding-top:1.4rem;border-top:1px solid var(--rule);
  display:flex;flex-wrap:wrap;gap:.6rem 2.2rem;font-family:var(--fm);font-size:.76rem;color:var(--ink-3)}

/* ---------- section frame ---------- */
section{padding:4rem 0;border-bottom:1px solid var(--rule)}
.sec-head{display:flex;gap:1.1rem;align-items:baseline;margin-bottom:2rem}
.sec-num{font-family:var(--fm);font-size:.78rem;color:var(--accent);letter-spacing:.1em;padding-top:.35rem}
.sec-head h2{font-size:clamp(1.5rem,3.4vw,2.1rem)}
.sec-head .sub{color:var(--ink-2);font-size:.94rem;margin-top:.5rem;max-width:58ch;line-height:1.7}

/* ---------- gap cards ---------- */
.gaps{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:1px;background:var(--rule);
  border:1px solid var(--rule);border-radius:4px;overflow:hidden}
.gap{background:var(--surface);padding:1.6rem 1.5rem}
.gap h3{font-size:1.06rem;margin-bottom:.7rem}
.gap .was{color:var(--ink-3);font-size:.86rem;line-height:1.7;padding-bottom:.75rem;margin-bottom:.75rem;border-bottom:1px dashed var(--rule-2)}
.gap .now{font-size:.92rem;color:var(--ink-2);line-height:1.75}
.gap .now b{color:var(--ink);font-weight:600}

/* ---------- figure ---------- */
figure{margin:0}
figure svg{display:block;width:100%;max-width:100%;height:auto;color:var(--ink)}
.figbox{background:var(--surface);border:1px solid var(--rule);border-radius:4px;padding:2rem 1.5rem 1.3rem;overflow-x:auto}
figcaption{margin-top:1.2rem;padding-top:1rem;border-top:1px solid var(--rule);
  color:var(--ink-2);font-size:.86rem;line-height:1.75;max-width:62ch}


/* ---------- platform selector ---------- */
.plat-bar{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1.6rem}
.plat-btn{font-family:var(--fb);font-size:.92rem;font-weight:600;color:var(--ink-2);background:var(--surface);
  border:1px solid var(--rule-2);border-radius:999px;padding:.5rem 1.05rem;cursor:pointer;
  transition:background .14s ease,color .14s ease,border-color .14s ease}
.plat-btn:hover{color:var(--ink);border-color:var(--ink-3)}
.plat-btn[aria-selected="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.panel[hidden]{display:none}
.panel{background:var(--surface);border:1px solid var(--rule);border-radius:4px;overflow:hidden}
.panel-top{padding:1.5rem 1.6rem;border-bottom:1px solid var(--rule);display:flex;flex-wrap:wrap;
  gap:1.2rem 2.4rem;align-items:flex-start;justify-content:space-between}
.panel-top h3{font-size:1.2rem}
.panel-top .tier{font-family:var(--fm);font-size:.74rem;color:var(--ink-3);letter-spacing:.09em;
  text-transform:uppercase;margin-bottom:.5rem}
.tierpill{display:inline-block;font-family:var(--fm);font-size:.76rem;letter-spacing:.04em;
  background:var(--accent-soft);color:var(--accent-2);border-radius:3px;padding:.32rem .7rem;white-space:nowrap}
.caps{display:grid;grid-template-columns:repeat(auto-fit,minmax(11rem,1fr));gap:1px;background:var(--rule)}
.cap{background:var(--surface);padding:1rem 1.1rem}
.cap dt{font-family:var(--fm);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);margin-bottom:.4rem}
.cap dd{margin:0;font-size:.9rem;line-height:1.6}
.cap dd.yes{color:var(--ok);font-weight:600}
.cap dd.no{color:var(--accent-2);font-weight:600}
.cap dd.half{color:var(--warn);font-weight:600}
.cap dd small{display:block;color:var(--ink-3);font-weight:400;font-size:.78rem;line-height:1.55;margin-top:.25rem}
.panel-body{padding:1.6rem}
.steps{list-style:none;counter-reset:s;margin:0;padding:0;display:flex;flex-direction:column;gap:.85rem}
.steps li{counter-increment:s;position:relative;padding-left:2.1rem;font-size:.94rem;line-height:1.75;color:var(--ink-2)}
.steps li::before{content:counter(s);position:absolute;left:0;top:.28rem;width:1.4rem;height:1.4rem;
  border:1px solid var(--rule-2);border-radius:50%;font-family:var(--fm);font-size:.72rem;
  display:flex;align-items:center;justify-content:center;color:var(--ink-3)}
.steps li b{color:var(--ink);font-weight:600}
.note{margin-top:1.4rem;padding:1rem 1.2rem;border-radius:3px;background:var(--sunken);
  border-left:3px solid var(--warn);font-size:.88rem;line-height:1.75;color:var(--ink-2)}
.note b{color:var(--ink)}
.note.crit{border-left-color:var(--accent)}

/* ---------- prompt block ---------- */
.pb{border:1px solid var(--rule-2);border-radius:4px;overflow:hidden;background:var(--sunken);margin-top:1.5rem}
.pb-head{display:flex;align-items:center;gap:.9rem;flex-wrap:wrap;padding:.7rem .9rem;
  background:var(--surface-2);border-bottom:1px solid var(--rule-2)}
.pb-name{font-family:var(--fm);font-size:.78rem;letter-spacing:.05em;color:var(--ink);font-weight:500}
.pb-count{font-family:var(--fm);font-size:.72rem;color:var(--ink-3);font-variant-numeric:tabular-nums;margin-left:auto}
.copy{font-family:var(--fm);font-size:.74rem;letter-spacing:.05em;background:var(--ink);color:var(--paper);
  border:1px solid var(--ink);border-radius:3px;padding:.36rem .85rem;cursor:pointer;white-space:nowrap;
  transition:opacity .14s ease}
.copy:hover{opacity:.82}
.copy.done{background:var(--ok);border-color:var(--ok)}
.pb pre{margin:0;padding:1.1rem 1.1rem 1.3rem;font-family:var(--fm);font-size:.8rem;line-height:1.85;
  white-space:pre-wrap;word-break:break-word;max-height:24rem;overflow-y:auto;color:var(--ink)}
.pb.open pre{max-height:none}
.pb-more{width:100%;font-family:var(--fm);font-size:.73rem;letter-spacing:.06em;color:var(--ink-2);
  background:var(--surface-2);border:0;border-top:1px solid var(--rule-2);padding:.5rem;cursor:pointer}
.pb-more:hover{color:var(--ink)}

/* ---------- fact table ---------- */
.tablewrap{overflow-x:auto;border:1px solid var(--rule);border-radius:4px;background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:44rem;font-size:.88rem}
th,td{text-align:left;padding:.85rem 1rem;border-bottom:1px solid var(--rule);vertical-align:top;line-height:1.65}
thead th{font-family:var(--fm);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);
  font-weight:500;background:var(--surface-2);border-bottom:1px solid var(--rule-2);white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
td.f{color:var(--ink-2)}
td.f b{color:var(--ink);font-weight:600}
td.src{white-space:nowrap}
td.src a{font-family:var(--fm);font-size:.74rem}

/* ---------- accordion ---------- */
details.st{border:1px solid var(--rule);border-radius:4px;background:var(--surface);margin-bottom:.6rem;overflow:hidden}
details.st summary{cursor:pointer;list-style:none;padding:1rem 1.2rem;display:flex;gap:.9rem;align-items:baseline}
details.st summary::-webkit-details-marker{display:none}
details.st summary .n{font-family:var(--fm);font-size:.76rem;color:var(--accent);flex-shrink:0}
details.st summary .t{font-weight:600;font-family:var(--fd);font-size:1rem}
details.st summary .o{margin-left:auto;color:var(--ink-3);font-size:.8rem;text-align:right;line-height:1.5;flex-shrink:0;max-width:19rem}
details.st[open] summary{border-bottom:1px solid var(--rule);background:var(--surface-2)}
.st-body{padding:1.2rem}
.st-body>p{color:var(--ink-2);font-size:.9rem;line-height:1.8}
.st-body .pb:first-of-type{margin-top:1rem}

/* ---------- redlines ---------- */
.reds{display:grid;grid-template-columns:repeat(auto-fit,minmax(17rem,1fr));gap:1.5rem}
.red{border-top:2px solid var(--accent);padding-top:1rem}
.red h4{font-size:.98rem;margin-bottom:.5rem}
.red p{font-size:.88rem;color:var(--ink-2);line-height:1.75}

/* ---------- footer ---------- */
footer{padding:3.5rem 0 4.5rem;color:var(--ink-3);font-size:.85rem;line-height:1.85}
footer h4{font-family:var(--fm);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);font-weight:500;margin-bottom:.9rem}
.foot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:2.5rem}
.foot-grid ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:.45rem}
.foot-grid a{font-size:.8rem;word-break:break-all}
.sig{margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--rule);font-family:var(--fm);font-size:.74rem}

@media (max-width:720px){
  .hero-in{padding:3rem 1.5rem 2.2rem}
  section{padding:3rem 0}
  .sec-head{flex-direction:column;gap:.3rem}
  .panel-body,.panel-top{padding:1.2rem}
  details.st summary .o{display:none}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}


.figbox svg{font-family:var(--fb)}
.figbox svg .t2{fill:var(--ink-2)}
.figbox svg .t3{fill:var(--ink-3)}
.figbox svg .ta{fill:var(--accent)}
.figbox svg .sr{stroke:var(--rule-2);fill:none}
.figbox svg .sa{stroke:var(--accent)}
.figbox svg text{fill:currentColor}
.figbox svg .t2,.figbox svg .t3,.figbox svg .ta{}

:root{
  --fd:"Songti SC","STSong","Iowan Old Style","Palatino Linotype",Georgia,serif;
  --fb:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Segoe UI",Arial,sans-serif;
}
html[lang="ja"]{--fd:"Yu Mincho","Hiragino Mincho ProN","Noto Serif JP",serif;--fb:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif}
html{scroll-behavior:smooth}section{scroll-margin-top:7rem}
.product-nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin:0 0 3.2rem;padding-bottom:1rem;border-bottom:1px solid var(--rule)}
.product-mark{font:800 .72rem/1 var(--fm);letter-spacing:.1em;text-transform:uppercase;color:var(--ink);text-decoration:none}
.product-links{display:flex;gap:.5rem 1.2rem;align-items:center;flex-wrap:wrap}.product-links a{font-size:.76rem;font-weight:650;color:var(--ink-2);text-decoration:none}.product-links a:hover{color:var(--ink)}
.consumer-hero .hero-in{padding-top:2rem;padding-bottom:4.4rem}.consumer-hero h1{font-size:clamp(3rem,8vw,6.7rem);line-height:1.02;letter-spacing:-.045em;max-width:13ch;hyphens:none;overflow-wrap:normal;word-break:normal}.consumer-hero h1 .hero-keep{white-space:nowrap}.consumer-hero h1 .hero-line{display:inline-block;white-space:nowrap}
.consumer-hero .ver{font-size:.78rem;line-height:1.4;letter-spacing:.08em;margin-top:1.2rem}.consumer-hero .lede{max-width:41rem;font-size:clamp(1.08rem,2vw,1.35rem)}
.consumer-hero .thesis{max-width:41rem;margin-top:1.6rem;padding:.85rem 0 .85rem 1.2rem}.consumer-hero .thesis p{color:var(--ink-2);font-size:.95rem;line-height:1.7}
.hero-actions{display:flex;gap:.7rem;flex-wrap:wrap;margin-top:2rem}.consumer-action{display:inline-flex;align-items:center;justify-content:center;min-height:2.85rem;padding:.78rem 1.05rem;border:1px solid var(--ink);background:var(--ink);color:var(--paper);font:750 .78rem/1.2 var(--fb);text-decoration:none;border-radius:3px}
.consumer-action.secondary{background:transparent;color:var(--ink);border-color:var(--rule-2)}.consumer-action.tertiary{background:transparent;color:var(--ink-2);border-color:transparent;text-decoration:underline;text-underline-offset:.25em}.consumer-action:hover{transform:translateY(-1px)}
.consumer-section{padding:5rem 0}.consumer-section-head{max-width:46rem;margin-bottom:2rem}.consumer-section-head .eyebrow{margin-bottom:.75rem}.consumer-section-head h2{font-size:clamp(2rem,5vw,3.5rem);line-height:1.05;letter-spacing:-.025em}.consumer-section-head .sub{max-width:42rem;margin-top:.8rem;color:var(--ink-2);font-size:1rem;line-height:1.7}
.start-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(16rem,.65fr);gap:1rem}.start-card{border:1px solid var(--rule-2);background:var(--surface);padding:1.5rem;min-width:0}.start-card.primary{padding:1.8rem}.consumer-badge{display:inline-flex;align-items:center;width:max-content;border:1px solid var(--rule-2);border-radius:999px;padding:.28rem .6rem;font:750 .65rem/1 var(--fm);letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.start-card h3,.developer-callout h2{font-size:clamp(1.35rem,3vw,2rem);margin:.9rem 0 .65rem}.start-card>p{color:var(--ink-2);line-height:1.7}.quick-prompt{margin-top:1.2rem}.quick-prompt pre{max-height:none;font-size:.84rem;line-height:1.65}.quick-prompt .pb-more{display:none!important}.start-card .consumer-action{margin-top:1.2rem}
.how-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--rule);border:1px solid var(--rule)}.how-step{background:var(--surface);padding:1.6rem}.how-step-num{font:750 .68rem/1 var(--fm);letter-spacing:.08em;color:var(--accent)}.how-step h3{font-size:1.12rem;margin:.8rem 0 .55rem}.how-step p{color:var(--ink-2);font-size:.9rem;line-height:1.7}
.deep-dive,.platform-details{margin-top:1.6rem;border:1px solid var(--rule-2);background:var(--surface)}.deep-dive>summary,.platform-details>summary{cursor:pointer;list-style:none;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:.65rem 1.5rem;align-items:center;padding:1.15rem 1.25rem}.deep-dive>summary::-webkit-details-marker,.platform-details>summary::-webkit-details-marker{display:none}.deep-dive>summary:after,.platform-details>summary:after{content:"+";font:500 1.35rem/1 var(--fm);color:var(--accent)}.deep-dive[open]>summary:after,.platform-details[open]>summary:after{content:"−"}.deep-dive>summary strong,.platform-details>summary strong{font-size:.92rem}.deep-dive>summary span,.platform-details>summary span{grid-column:1;color:var(--ink-3);font-size:.8rem;line-height:1.55}.deep-dive>section,.platform-details>.platform-detail-body{border-top:1px solid var(--rule);padding-left:1.25rem;padding-right:1.25rem}.deep-dive>section:last-child{border-bottom:0}
.platform-cloud{font:750 clamp(.9rem,2vw,1.05rem)/1.7 var(--fb);color:var(--ink);letter-spacing:.01em}.platform-details .platform-detail-body{padding-top:1.4rem;padding-bottom:1.4rem}.platform-details .gaps{margin-bottom:2.2rem!important}
.developer-callout{display:grid;grid-template-columns:minmax(0,1fr) minmax(15rem,.45fr);gap:2.5rem;align-items:end;padding:2.2rem;border:1px solid var(--rule-2);background:var(--ink);color:var(--paper)}.developer-callout p{color:color-mix(in srgb,var(--paper) 76%,transparent);line-height:1.7}.developer-callout .consumer-badge{color:#ff8a65;border-color:color-mix(in srgb,var(--paper) 26%,transparent)}.developer-callout .consumer-action{background:var(--paper);color:var(--ink);border-color:var(--paper)}.developer-note{font-size:.78rem!important;margin-top:.8rem}
.consumer-utility{display:flex;align-items:center;justify-content:space-between;gap:.7rem 1.5rem;flex-wrap:wrap;margin-top:3rem;padding:1.1rem 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}.consumer-utility-links{display:flex;gap:.55rem 1rem;flex-wrap:wrap}.consumer-utility a{color:var(--ink);font-size:.78rem;font-weight:700;text-underline-offset:.2em}.consumer-utility p{max-width:42rem;color:var(--ink-3);font-size:.72rem;line-height:1.55}
.developer-language{display:flex;gap:.45rem .9rem;flex-wrap:wrap}.developer-language a{font-size:.76rem;color:var(--ink-2)}.developer-main{width:var(--w);margin:0 auto;padding:0 1.5rem 5rem}.developer-hero .hero-in{padding-top:4rem}.developer-hero h1{max-width:16ch}.developer-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.developer-card{border:1px solid var(--rule-2);background:var(--surface);padding:1.4rem}.developer-card h3{font-size:1.2rem;margin:.6rem 0}.developer-card p,.developer-card li{color:var(--ink-2);font-size:.88rem;line-height:1.65}.route-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--rule);border:1px solid var(--rule)}.route-card{background:var(--surface);padding:1.25rem}.route-card code{color:var(--accent);font-weight:750}.route-card p{margin-top:.55rem;color:var(--ink-2);font-size:.82rem;line-height:1.6}.developer-code{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--ink);color:var(--paper);padding:1.25rem;border-radius:3px;font:500 .76rem/1.6 var(--fm)}.developer-resources{display:grid;gap:.55rem;list-style:none;padding:0}.developer-resources a{display:block;border:1px solid var(--rule-2);background:var(--surface);padding:.85rem 1rem;color:var(--ink);font-weight:650;text-decoration:none}.developer-resources small{display:block;color:var(--ink-3);font-weight:400;margin-top:.25rem}
.origin-story{display:grid;grid-template-columns:minmax(10rem,.42fr) minmax(0,1fr);gap:2rem 4rem;align-items:start}
.origin-story-head{padding-top:.15rem}.origin-story-label{margin-bottom:.8rem}.origin-story h2{font-size:clamp(1.5rem,3.4vw,2.15rem)}
.origin-story-body{max-width:45rem}.origin-story-paragraph{color:var(--ink-2);font-size:.98rem;line-height:1.85}
.origin-story-paragraph+.origin-story-paragraph{margin-top:1rem}.origin-story-opening{color:var(--ink);font-size:1.08rem}
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