/* Layout concept: one long trust page. A navy opening band carries a real evidence card, then paper-coloured sections that read like a case file: terms of art in the margin, labels as stamps. */
:root{
  --bg:#F3F7FA; --surface:#FFFFFF; --surface-2:#E9EFF5; --ink:#0D2237; --muted:#47596C; --line:#D3DEE8;
  --head-bg:#F3F7FA;
  --navy:#0B2A4A; --navy-2:#14406B; --on-navy:#EEF4FA; --on-navy-muted:#B6C8DA;
  --hero-btn-bg:#22D3BE; --hero-btn-fg:#062232;
  --teal:#0A7A6D; --teal-bright:#2BD9C2;
  --btn-bg:#0B2A4A; --btn-fg:#FFFFFF;
  --chip-ok:#1B7F54; --chip-warn:#97600F; --chip-unk:#4D5B69;
  --ok-bg:#E2F4EA; --warn-bg:#FBF1D9; --unk-bg:#E8EDF2;
  --f-display:"Bricolage Grotesque","Segoe UI",system-ui,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --f-body:"Public Sans",system-ui,-apple-system,"Segoe UI","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,"PingFang SC","Noto Sans SC",monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0A1522; --surface:#102033; --surface-2:#16293F; --ink:#E8F0F7; --muted:#9FB3C6; --line:#243A52;
    --head-bg:#0A1522;
    --navy:#0E2B4B; --navy-2:#173F69;
    --teal:#3DDBC6;
    --btn-bg:#3DDBC6; --btn-fg:#06222B;
    --ok-bg:#12302A; --warn-bg:#392D14; --unk-bg:#1A2A3B;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0A1522; --surface:#102033; --surface-2:#16293F; --ink:#E8F0F7; --muted:#9FB3C6; --line:#243A52;
  --head-bg:#0A1522;
  --navy:#0E2B4B; --navy-2:#173F69;
  --teal:#3DDBC6;
  --btn-bg:#3DDBC6; --btn-fg:#06222B;
  --ok-bg:#12302A; --warn-bg:#392D14; --unk-bg:#1A2A3B;
  color-scheme:dark;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.6;-webkit-text-size-adjust:100%}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--head-bg)}
img{max-width:100%}
a{color:inherit}
:focus-visible{outline:3px solid var(--teal-bright);outline-offset:2px;border-radius:4px}
h1,h2,h3{font-family:var(--f-display);margin:0;text-wrap:balance;color:inherit}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}

.wrap{max-width:1160px;margin-inline:auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.band{padding-block:60px}
.band.tint{background:var(--surface-2)}
section[id]{scroll-margin-top:72px}

/* header */
.site-head{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--head-bg);border-bottom:1px solid var(--line)}
.head-in{display:flex;align-items:center;gap:20px;min-height:60px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--f-display);font-weight:700;font-size:1.08rem;letter-spacing:-.01em;margin-right:auto}
.brand-mark{width:26px;height:26px;border-radius:7px;background:var(--navy);display:grid;place-items:center;flex:none}
.brand-mark i{display:block;width:11px;height:6px;border-left:2.5px solid var(--teal-bright);border-bottom:2.5px solid var(--teal-bright);transform:rotate(-45deg) translate(1px,-1px)}
.nav{display:flex;gap:22px;font-size:.92rem}
.nav a{text-decoration:none;color:var(--muted);padding-block:6px}
.nav a:hover{color:var(--ink)}
.btn{display:inline-block;background:var(--btn-bg);color:var(--btn-fg);font-weight:600;font-size:.95rem;text-decoration:none;padding:.7rem 1.15rem;border-radius:8px;border:0;cursor:pointer;font-family:var(--f-body);line-height:1.2;text-align:center}
.btn:hover{filter:brightness(1.08)}
.btn.line{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn.small{padding:.55rem .95rem;font-size:.9rem}
@media (max-width:820px){.nav{display:none}}

/* hero */
.hero{background:var(--navy);color:var(--on-navy)}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:56px;align-items:center}
.hero-copy{min-width:0}
.hero h1{font-size:clamp(2.15rem,5.2vw,3.7rem);line-height:1.04;font-weight:700;letter-spacing:-.025em}
.hero h1 span{display:block;color:var(--teal-bright);margin-top:.2em}
.hero-copy>p{margin-top:22px;max-width:54ch;font-size:1.08rem;color:var(--on-navy-muted)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.hero .btn{background:var(--hero-btn-bg);color:var(--hero-btn-fg)}
.hero .btn.ghost{background:transparent;color:var(--on-navy);box-shadow:inset 0 0 0 1.5px rgba(238,244,250,.5)}
.trust{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:30px;font-size:.88rem;color:var(--on-navy-muted)}
.trust li{display:flex;align-items:center;gap:8px}
.trust li::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--teal-bright)}
@media (max-width:900px){.hero .wrap{grid-template-columns:minmax(0,1fr);gap:40px}.band{padding-block:44px}}

/* evidence card */
.card-case{background:var(--surface);color:var(--ink);border-radius:12px;padding:20px;box-shadow:0 18px 40px rgba(2,12,26,.35);min-width:0}
.case-top{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-family:var(--f-mono);font-size:.72rem;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);padding-bottom:14px;border-bottom:1px solid var(--line)}
.rows{display:grid;gap:8px;margin-top:14px}
.row{display:grid;grid-template-columns:136px minmax(0,1fr);gap:12px;align-items:center;padding:10px 12px;border-radius:8px;font-size:.92rem;line-height:1.4}
.row.ok{background:var(--ok-bg)} .row.warn{background:var(--warn-bg)} .row.unk{background:var(--unk-bg)}
.chip{display:inline-block;justify-self:start;font-family:var(--f-mono);font-weight:500;font-size:.66rem;letter-spacing:.06em;text-transform:uppercase;color:#fff;padding:.3rem .5rem;border-radius:4px;white-space:nowrap}
.chip.ok{background:var(--chip-ok)} .chip.warn{background:var(--chip-warn)} .chip.unk{background:var(--chip-unk)}
.case-foot{margin-top:14px;padding-top:14px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:.86rem;color:var(--muted)}
.case-foot b{color:var(--ink);font-weight:600}
@media (max-width:480px){.row{grid-template-columns:minmax(0,1fr);gap:6px}}

/* section heads */
.sh{max-width:680px;margin-bottom:40px}
.sh h2{font-size:clamp(1.65rem,3.4vw,2.45rem);line-height:1.1;font-weight:700;letter-spacing:-.02em}
.sh p{margin-top:14px;color:var(--muted);font-size:1.05rem}

/* worries */
.worries{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:36px}
.worries h3{font-size:1.2rem;font-weight:600;line-height:1.25}
.worries p{margin-top:10px;color:var(--muted)}
.worries li{border-top:2px solid var(--ink);padding-top:16px}

/* checks */
.checks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 56px}
.checks li{padding:22px 0;border-top:1px solid var(--line);min-width:0}
.term{font-family:var(--f-mono);font-size:.78rem;color:var(--teal);letter-spacing:.02em}
.checks h3{font-size:1.15rem;font-weight:600;margin-top:4px}
.checks p{margin-top:8px;color:var(--muted)}
@media (max-width:760px){.checks{grid-template-columns:minmax(0,1fr)}}

/* labels */
.labels{display:grid;gap:12px}
.lab{display:grid;grid-template-columns:170px minmax(0,1fr) minmax(0,1.1fr);gap:20px;align-items:center;padding:18px 20px;border-radius:10px}
.lab.ok{background:var(--ok-bg)} .lab.warn{background:var(--warn-bg)} .lab.unk{background:var(--unk-bg)}
.lab .def{font-weight:600}
.lab .ex{color:var(--muted);font-size:.95rem}
@media (max-width:820px){.lab{grid-template-columns:minmax(0,1fr);gap:8px}}

/* sample */
.sample{display:grid;grid-template-columns:minmax(0,1fr);gap:24px}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:620px;font-size:.95rem}
th,td{text-align:left;padding:.8rem 1rem;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:500;background:var(--surface-2)}
tr:last-child td{border-bottom:0}
td:first-child{font-weight:600;width:24%}
td:last-child{width:170px}
.sample-foot{display:flex;flex-wrap:wrap;gap:16px 28px;align-items:center;justify-content:space-between}
.sample-foot p{max-width:62ch;color:var(--muted)}
.sample-foot b{color:var(--ink)}


/* factory vs trader */
.sig{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:28px;margin-bottom:36px}
.sig li{border-top:2px solid var(--ink);padding-top:14px;min-width:0}
.sig h3{font-size:1.1rem;font-weight:600}
.sig ul{margin-top:10px;display:grid;gap:8px;color:var(--muted);font-size:.95rem}
.sig ul li{border:0;padding:0 0 0 16px;position:relative}
.sig ul li::before{content:"";position:absolute;left:0;top:.7em;width:6px;height:6px;border-radius:50%;background:var(--teal)}
.fcmp td:first-child{width:18%}
.fcmp td:last-child{width:190px}
@media (max-width:640px){.fcmp,.stack{min-width:0}.fcmp thead,.stack thead{display:none}.fcmp tr,.stack tr{display:block;padding:12px 14px;border-bottom:1px solid var(--line)}.fcmp tr:last-child,.stack tr:last-child{border-bottom:0}.fcmp td,.stack td{display:block;width:auto!important;border:0;padding:2px 0}.fcmp td:last-child,.stack td:last-child{padding-top:6px}}
.fnote{margin-top:16px;color:var(--muted);font-size:.92rem;max-width:80ch}


.brand{white-space:nowrap}
.site-head .btn.small{white-space:nowrap}
@media (max-width:420px){.brand{font-size:.95rem}.head-in{gap:12px}}
/* structure additions */
.legend{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px 24px}
.legend li{display:flex;gap:10px;align-items:baseline;font-size:.92rem;color:var(--muted)}
.legend .chip{flex:none}
.btn-row{display:flex;flex-wrap:wrap;gap:12px}
details.more summary{font-size:1rem}
details.more .sig{margin:6px 0 20px}
.pkg .btn{margin-top:auto}
.faq .faq-in details:first-child{border-top:1px solid var(--line)}
details.morefaq>summary{color:var(--teal)}
.mcta{display:none}
@media (max-width:820px){
  .mcta{display:block;position:fixed;left:max(16px,env(safe-area-inset-left,0px));right:max(16px,env(safe-area-inset-right,0px));bottom:max(12px,env(safe-area-inset-bottom,0px));z-index:25;box-shadow:0 8px 24px rgba(2,12,26,.3);transition:opacity .2s}
  .mcta.off{opacity:0;pointer-events:none}
  footer{padding-bottom:72px}
}

.sample-foot{align-items:flex-start;justify-content:flex-start;gap:28px}
.sf-text{flex:1 1 280px;min-width:0;display:grid;gap:18px;align-content:start}
.preview{display:block;flex:none;width:min(100%,260px);border:1px solid var(--line);border-radius:8px;overflow:hidden;box-shadow:0 10px 26px rgba(2,12,26,.14);background:#fff}
.preview img{display:block;width:100%;height:auto}
.sample-foot>div{min-width:0}
/* steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:32px;counter-reset:s}
.steps li{counter-increment:s;min-width:0}
.steps li::before{content:counter(s);display:block;font-family:var(--f-mono);font-size:2.4rem;font-weight:500;color:var(--teal);line-height:1;margin-bottom:14px}
.steps h3{font-size:1.15rem;font-weight:600}
.steps p{margin-top:8px;color:var(--muted)}

/* packages */
.pk{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}
.pkg{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:26px;display:flex;flex-direction:column;gap:16px;min-width:0}
.pkg h3{font-size:1.25rem;font-weight:700}
.price{font-family:var(--f-display);font-size:2.4rem;font-weight:700;letter-spacing:-.02em;line-height:1;font-variant-numeric:tabular-nums}
.price.alt{font-size:1.25rem;font-weight:600;line-height:1.3;padding-block:.5rem;color:var(--muted)}
.pkg .sum{color:var(--muted);font-size:.95rem}
.pkg ul{display:grid;gap:10px;font-size:.95rem}
.pkg li{display:flex;gap:10px;align-items:baseline}
.pkg li::before{content:"";flex:none;width:7px;height:7px;border-radius:50%;background:var(--teal);transform:translateY(-1px)}
.pk-note{margin-top:22px;color:var(--muted);font-size:.92rem;max-width:80ch}

/* fit */
.fit{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:40px}
.fit h3{font-size:1.2rem;font-weight:600;padding-bottom:12px;border-bottom:2px solid var(--ink)}
.fit ul{margin-top:6px}
.fit li{padding:12px 0;border-bottom:1px solid var(--line)}

/* about */
.about{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:48px}
.about h2{font-size:clamp(1.65rem,3.4vw,2.45rem);line-height:1.1;font-weight:700;letter-spacing:-.02em}
.about p{color:var(--muted);font-size:1.05rem}
.about p+p{margin-top:14px}
@media (max-width:760px){.about{grid-template-columns:minmax(0,1fr);gap:20px}}

.who{display:grid;gap:14px;justify-items:start;align-content:start}
.portrait{width:112px;height:112px;border-radius:50%;object-fit:cover;border:3px solid var(--surface);box-shadow:0 0 0 1px var(--line)}
.who .name{margin-top:10px;font-weight:600;color:var(--ink);font-size:1.05rem}
.who .loc{color:var(--muted);font-size:.92rem}
/* brief */
.brief{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px;align-items:start}
.fields{display:grid;gap:14px}
.fields label{display:grid;gap:6px;font-weight:600;font-size:.92rem}
.fields input{font:inherit;font-weight:400;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:.65rem .8rem;width:100%;min-width:0}
.out{display:grid;gap:12px;min-width:0}
.out textarea{font-family:var(--f-mono);font-size:.84rem;line-height:1.55;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:.9rem 1rem;width:100%;min-height:236px;resize:vertical}
.out-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.status{font-size:.9rem;color:var(--muted);min-height:1.4em}
.hint{font-size:.88rem;color:var(--muted)}
@media (max-width:820px){.brief{grid-template-columns:minmax(0,1fr)}}

/* faq */
.faq{max-width:820px}
details{border-top:1px solid var(--line)}
details:last-child{border-bottom:1px solid var(--line)}
summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:20px;align-items:baseline;padding:18px 0;font-weight:600;font-size:1.05rem}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-family:var(--f-mono);font-size:1.3rem;color:var(--teal);flex:none}
details[open] summary::after{content:"\2212"}
details p{padding:0 0 20px;color:var(--muted);max-width:68ch}

footer{border-top:1px solid var(--line)}
footer .wrap{padding-block:30px;display:flex;flex-wrap:wrap;gap:10px 30px;justify-content:space-between;color:var(--muted);font-size:.88rem}
footer p{max-width:70ch}

/* ---- article additions ---- */
.art{max-width:760px;margin:0 auto;padding:44px 0 72px}
.crumbs{font-family:var(--f-mono);font-size:.78rem;color:var(--muted);margin-bottom:18px}
.crumbs a{text-decoration:none;color:var(--teal)}
.art h1{font-family:var(--f-display);font-size:clamp(2rem,4.6vw,3rem);line-height:1.08;letter-spacing:-.02em;font-weight:700}
.byline{color:var(--muted);font-size:.9rem;margin:14px 0 26px}
.art .lead{font-size:1.15rem;line-height:1.55;color:var(--ink);margin-bottom:8px}
.art h2{font-family:var(--f-display);font-size:clamp(1.4rem,2.8vw,1.8rem);line-height:1.15;letter-spacing:-.015em;font-weight:700;margin:2.1em 0 .5em}
.art h3{font-size:1.08rem;font-weight:600;margin:1.5em 0 .3em}
.art p{margin:.8em 0;max-width:68ch}
.art ul{list-style:disc;padding-left:1.3em;margin:.8em 0}
.art ol{list-style:decimal;padding-left:1.4em;margin:.8em 0}
.art li{margin:.45em 0;max-width:66ch}
.art a{color:var(--teal);text-underline-offset:3px}
.art .zh{font-family:var(--f-body);font-weight:600}
.art .tablewrap{overflow-x:auto;margin:1.2em 0;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.art table{width:100%;border-collapse:collapse;font-size:.95rem;min-width:560px}
.art th,.art td{text-align:left;vertical-align:top;padding:.7rem .9rem;border-bottom:1px solid var(--line)}
.art th{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);background:var(--surface-2)}
.art tr:last-child td{border-bottom:0}
.callout{border-left:4px solid var(--teal);background:var(--surface);padding:14px 18px;border-radius:0 10px 10px 0;margin:1.4em 0;max-width:68ch}
.callout p{margin:.3em 0}
.note{font-size:.88rem;color:var(--muted);margin-top:2em}
.cta-box{margin-top:2.6em;padding:24px;border-radius:14px;background:var(--navy);color:var(--on-navy)}
.cta-box h2{margin:0 0 .4em;font-size:1.35rem;color:var(--on-navy)}
.cta-box p{color:var(--on-navy-muted);margin:.4em 0 1em}
.cta-box .btn{background:var(--hero-btn-bg);color:var(--hero-btn-fg)}
.cta-box .btn.ghost{background:transparent;color:var(--on-navy);box-shadow:inset 0 0 0 1.5px rgba(238,244,250,.5)}
.related{margin-top:2.4em;border-top:1px solid var(--line);padding-top:1.2em}
.related h2{font-size:1.05rem;margin:0 0 .5em}
.related ul{list-style:none;padding:0}
.related li{margin:.4em 0}
.cards{display:grid;gap:16px;margin-top:1.4em}
.card{display:block;text-decoration:none;color:var(--ink)!important;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 20px}
.card:hover{border-color:var(--teal)}
.card b{display:block;font-family:var(--f-display);font-size:1.2rem;line-height:1.2;margin-bottom:.35em}
.card span{color:var(--muted);font-size:.95rem}
@media (max-width:640px){
.art table{min-width:0}
.art thead{display:none}
.art tr{display:block;padding:12px 14px;border-bottom:1px solid var(--line)}
.art tr:last-child{border-bottom:0}
.art td{display:block;padding:.15rem 0;border:0}
.art td:first-child{font-weight:600}
}