/* 知答 homepage — "drawing sheet" language: warm paper, ink line work, vermilion seal, reference numerals. */
body.home-active{background:#f3efe6;color:#15171c}
#workspace{min-height:100vh}
.z-home{
 --paper:#f3efe6;--paper-2:#ebe5d8;--sheet:#fbf9f4;--ink:#15171c;--ink-2:#40444b;--ink-3:#62656b;--rule:rgba(21,23,28,.14);--rule-2:rgba(21,23,28,.08);
 --seal:#c4371a;--seal-deep:#9f2a12;--seal-soft:rgba(196,55,26,.09);--mark:#f4dc6a;
 --serif:"Noto Serif SC","Noto Serif CJK SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
 --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Noto Sans CJK SC",system-ui,sans-serif;
 --mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Menlo,Consolas,"Noto Sans Mono CJK SC",monospace;
 --ease:cubic-bezier(.2,.7,.2,1);--wrap:1320px;--gut:clamp(20px,4vw,48px);
 font-family:var(--sans);font-size:16px;line-height:1.75;color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased;overflow-x:clip
}
html:has(body.home-active){scroll-behavior:smooth;scroll-padding-top:84px}
:where(.z-home) *,:where(.z-home) *::before,:where(.z-home) *::after{box-sizing:border-box}
:where(.z-home) :where(h1,h2,h3,h4,p,ul,ol,figure){margin:0}
:where(.z-home) :where(ul,ol){padding:0;list-style:none}
:where(.z-home) a{color:inherit;text-decoration:none}
:where(.z-home) button{font:inherit;color:inherit;background:none;border:0;border-radius:0;padding:0;cursor:pointer}
.z-home :focus-visible{outline:2px solid var(--seal);outline-offset:3px;border-radius:3px}
.z-home [hidden]{display:none!important}
.z-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.z-skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--ink);color:var(--paper)!important;padding:10px 14px;border-radius:4px}
.z-skip:focus{top:12px}
.z-pn{font-family:var(--mono);font-size:.78em;letter-spacing:.02em;color:var(--seal);margin-right:.6em;font-weight:500}
.z-kicker{font-size:13px;letter-spacing:.08em;color:var(--ink-2);display:flex;align-items:center}

/* Header */
.z-head{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:28px;height:68px;padding:0 var(--gut);background:rgba(243,239,230,.86);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid transparent;transition:border-color .3s,background .3s}
.z-head.is-scrolled{border-bottom-color:var(--rule);background:rgba(243,239,230,.94)}
.z-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--seal);transform-origin:0 50%;transform:scaleX(0)}
.z-brand{display:inline-flex;align-items:center;gap:11px;flex:none}
.z-seal{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:4px;background:var(--seal);color:var(--sheet);font:700 19px/1 var(--serif);box-shadow:inset 0 0 0 2px var(--seal),inset 0 0 0 3.5px var(--sheet);transform:rotate(-4deg);transition:transform .4s var(--ease)}
.z-brand:hover .z-seal{transform:rotate(0) scale(1.04)}
.z-brand-name{font:700 19px/1.1 var(--serif);letter-spacing:.06em;display:flex;flex-direction:column}
.z-brand-name small{font:500 10.5px/1.4 var(--sans);letter-spacing:.2em;color:var(--ink-3);margin-top:2px}
.z-nav{display:flex;gap:4px;margin-left:auto}
.z-nav a{position:relative;padding:8px 14px;font-size:14.5px;color:var(--ink-2);border-radius:4px;transition:color .2s}
.z-nav a::after{content:"";position:absolute;left:14px;right:14px;bottom:3px;height:1.5px;background:var(--seal);transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease)}
.z-nav a:hover,.z-nav a[aria-current]{color:var(--ink)}
.z-nav-work{display:none}
.z-nav a:hover::after,.z-nav a[aria-current]::after{transform:scaleX(1)}
.z-head-actions{display:flex;align-items:center;gap:14px;flex:none}
.z-link{font-size:14.5px;font-weight:600;color:var(--ink);padding:8px 4px;background:linear-gradient(var(--seal),var(--seal)) 0 100%/0 1.5px no-repeat;transition:background-size .35s var(--ease)}
.z-link:hover{background-size:100% 1.5px}
.z-menu{display:none;width:42px;height:42px;border:1px solid var(--rule)!important;border-radius:6px!important;position:relative}
.z-menu i,.z-menu i::before,.z-menu i::after{position:absolute;left:11px;width:18px;height:1.5px;background:var(--ink);transition:transform .3s var(--ease),opacity .2s}
.z-menu i{top:20px}.z-menu i::before{content:"";left:0;top:-6px}.z-menu i::after{content:"";left:0;top:6px}
.is-open .z-menu i{background:transparent}.is-open .z-menu i::before{transform:translateY(6px) rotate(45deg)}.is-open .z-menu i::after{transform:translateY(-6px) rotate(-45deg)}

/* Buttons: ink or seal, with a stamp echo on press */
.z-btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:.55em;min-height:48px;padding:12px 22px;border-radius:6px;font-size:15px;font-weight:600;letter-spacing:.02em;line-height:1.3;transition:background .25s,color .25s,border-color .25s,transform .12s;touch-action:manipulation}
.z-btn>span{display:inline-block;transition:transform .35s var(--ease)}
.z-btn:hover>span{transform:translate(2px,-2px)}
.z-btn[href^="#start"]:hover>span,.z-btn[href="#start"]:hover>span{transform:translateY(3px)}
.z-btn::after{content:"";position:absolute;inset:-5px;border:1.5px solid var(--seal);border-radius:9px;opacity:0;transform:scale(.94);transition:opacity .5s,transform .5s var(--ease);pointer-events:none}
.z-btn:active{transform:translateY(1px) scale(.985)}
.z-btn:active::after{opacity:.55;transform:scale(1);transition:0s}
.z-btn-sm{min-height:40px;padding:8px 16px;font-size:14px}
.z-btn-seal{background:var(--seal);color:#fff}
.z-btn-seal:hover{background:var(--seal-deep)}
.z-btn-ink{background:var(--ink);color:var(--paper)}
.z-btn-ink:hover{background:#2b2e35}
.z-btn-line{border:1.5px solid var(--ink);color:var(--ink)}
.z-btn-line:hover{background:var(--ink);color:var(--paper)}
.z-btn-line::after{border-color:var(--ink)}

/* Hero */
.z-hero{max-width:var(--wrap);margin:0 auto;padding:clamp(36px,6vw,72px) var(--gut) clamp(40px,5vw,64px);display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(28px,4.5vw,72px);align-items:center}
.z-display{font:700 clamp(2.4rem,.9rem + 3.5vw,4.35rem)/1.16 var(--serif);letter-spacing:-.005em;margin:22px 0 26px;outline:none}
.z-display span{display:block;white-space:nowrap;animation:z-rise .9s var(--ease) both}
.z-display span:nth-child(2){animation-delay:.09s}.z-display span:nth-child(3){animation-delay:.18s}
.z-display em{font-style:normal;color:var(--seal);background:linear-gradient(transparent 68%,var(--seal-soft) 68%)}
.z-lede{font-size:clamp(16px,1.2vw,18px);line-height:1.9;color:var(--ink-2);max-width:34em;animation:z-rise .9s .26s var(--ease) both}
.z-cta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:32px;animation:z-rise .9s .34s var(--ease) both}
.z-hero-note{display:flex;align-items:center;gap:9px;margin-top:22px;font-size:13.5px;color:var(--ink-3)}
.z-dot{width:7px;height:7px;border-radius:50%;background:var(--seal);box-shadow:0 0 0 4px var(--seal-soft)}

.z-sheet{position:relative;background:var(--sheet);border:1px solid var(--rule);border-radius:4px;padding:16px clamp(14px,2vw,26px) 20px;box-shadow:0 1px 0 rgba(21,23,28,.04),0 40px 70px -42px rgba(70,50,20,.35);animation:z-sheet 1s .1s var(--ease) both}
.z-sheet::before,.z-sheet::after{content:"";position:absolute;width:14px;height:14px;border:1.5px solid var(--ink);pointer-events:none}
.z-sheet::before{top:-8px;left:-8px;border-right:0;border-bottom:0}
.z-sheet::after{bottom:-8px;right:-8px;border-left:0;border-top:0}
.z-sheet-bar{display:flex;align-items:center;gap:14px;font:500 12.5px/1 var(--mono);color:var(--ink-2);padding-bottom:12px;border-bottom:1px solid var(--rule-2)}
.z-sheet-bar>span:first-child{font:700 14px/1 var(--serif);color:var(--ink);letter-spacing:.1em}
.z-sheet-meta{margin-left:auto;font-variant-numeric:tabular-nums;white-space:nowrap}
.z-sheet-btn{font:500 12.5px/1 var(--sans)!important;padding:7px 11px!important;border:1px solid var(--rule)!important;border-radius:4px!important;color:var(--ink-2)}
.z-sheet-btn:hover{border-color:var(--ink)!important;color:var(--ink)}
.z-stage{margin:6px -6px 0;background-image:linear-gradient(var(--rule-2) 1px,transparent 1px),linear-gradient(90deg,var(--rule-2) 1px,transparent 1px);background-size:24px 24px;background-position:-1px -1px;border-radius:2px}
.z-mech{display:block;width:100%;height:auto;overflow:visible;touch-action:pan-y;-webkit-user-select:none;user-select:none}
.z-mech:focus-visible{outline:2px solid var(--seal);outline-offset:4px}
.z-spec{margin-top:12px;font:400 15.5px/1.95 var(--serif);color:var(--ink)}
.z-figcap{margin-top:10px;padding-top:10px;border-top:1px solid var(--rule-2);font-size:12.5px;line-height:1.7;color:var(--ink-3)}

/* SVG vocabulary */
.z-home svg text{font-family:var(--sans)}
.edge{fill:none;stroke:var(--ink);stroke-width:2;stroke-linejoin:round}
.fillp{fill:var(--sheet)}
.hz{stroke:none}
.hl{stroke:var(--ink);stroke-width:1.2;opacity:.5}
.cl{fill:none;stroke:var(--ink-3);stroke-width:1;stroke-dasharray:18 4 3 4}
.trace{fill:none;stroke:var(--ink-3);stroke-width:1;stroke-dasharray:2 5}
.thin{fill:none;stroke:var(--ink);stroke-width:1}
.mk{fill:none;stroke:var(--ink);stroke-width:1.5}
.mks{fill:none;stroke:var(--seal);stroke-width:1.5}
.dimt{font:500 13px var(--mono)!important;fill:var(--ink-2);text-anchor:middle}
.body{fill:var(--sheet);stroke:var(--ink);stroke-width:2}
.pad{fill:var(--paper-2)}
.dash{stroke-dasharray:6 5}
.bar-o{stroke:var(--ink);stroke-width:18;stroke-linecap:round}
.bar-i{stroke:var(--sheet);stroke-width:14;stroke-linecap:round}
.joint{fill:var(--sheet);stroke:var(--ink);stroke-width:2}
.ring{fill:rgba(196,55,26,.001);stroke:var(--seal);stroke-width:1.5;stroke-dasharray:4 4;cursor:grab;touch-action:none;animation:z-breathe 2.6s ease-in-out infinite}
.lead{fill:none;stroke:var(--ink);stroke-width:1}
.z-sheet .lead{stroke-dasharray:1;animation:z-lead 1.2s .5s var(--ease) both}
.num{font:600 21px var(--serif)!important;fill:var(--ink)}
.part{cursor:pointer;transition:opacity .25s}
.part .body,.part .edge,.part .bar-o{transition:stroke .25s}
.xh{stroke:var(--seal);stroke-width:.8;opacity:0;pointer-events:none;transition:opacity .2s}
.xt{font:500 11px var(--mono)!important;fill:var(--seal);opacity:0;pointer-events:none}
.z-mech.is-measuring .xh{opacity:.45}.z-mech.is-measuring .xt{opacity:1}
.z-mech.is-dragging,.z-mech.is-dragging .ring{cursor:grabbing}
.z-mech.is-dragging .xh,.z-mech.is-dragging .xt{opacity:0}
.z-mech[data-active] .part{opacity:.38}
.z-mech[data-active="1"] [data-part="1"],.z-mech[data-active="2"] [data-part="2"],.z-mech[data-active="3"] [data-part="3"],.z-mech[data-active="4"] [data-part="4"],.z-mech[data-active="5"] [data-part="5"]{opacity:1}
.z-mech[data-active="1"] [data-part="1"] .edge,.z-mech[data-active="4"] [data-part="4"] .body,.z-mech[data-active="5"] [data-part="5"] .body,.z-mech[data-active="2"] [data-part="2"] .bar-o,.z-mech[data-active="3"] [data-part="3"] .bar-o{stroke:var(--seal)}
.z-mech[data-active="1"] [data-leader="1"],.z-mech[data-active="2"] [data-leader="2"],.z-mech[data-active="3"] [data-leader="3"],.z-mech[data-active="4"] [data-leader="4"]{stroke:var(--seal);stroke-width:1.6}
.z-mech[data-active="1"] [data-num="1"],.z-mech[data-active="2"] [data-num="2"],.z-mech[data-active="3"] [data-num="3"],.z-mech[data-active="4"] [data-num="4"]{fill:var(--seal)}
.ref{font:inherit!important;color:inherit;border-bottom:1.5px dotted var(--seal)!important;padding:0 2px!important;margin:0 1px;border-radius:2px!important;transition:background .2s,color .2s}
.ref:hover,.ref.is-on,.ref[aria-pressed=true]{background:var(--seal-soft)!important;color:var(--seal-deep)}

/* Quick picks under the hero */
.z-quick{grid-column:1/-1;display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding-top:26px;border-top:1px solid var(--rule)}
.z-quick-q{font:600 15px var(--serif);margin-right:6px}
.z-quick a{padding:9px 16px;border:1px solid var(--rule);border-radius:999px;font-size:14.5px;background:var(--sheet);transition:background .25s,color .25s,border-color .25s}
.z-quick a:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}

/* Sections */
.z-sec{position:relative;scroll-margin-top:-56px;max-width:var(--wrap);margin:0 auto;padding:clamp(72px,9vw,128px) var(--gut) 0}
.z-sec::before{content:"";position:absolute;top:0;left:var(--gut);right:var(--gut);height:9px;border-top:1px solid var(--rule);background:repeating-linear-gradient(90deg,var(--rule) 0 1px,transparent 1px 12px);-webkit-mask:linear-gradient(90deg,#000,transparent 55%);mask:linear-gradient(90deg,#000,transparent 55%)}
.z-sec-head{max-width:760px;margin-bottom:clamp(32px,4vw,52px)}
.z-sec-head h2{font:700 clamp(1.9rem,1.1rem + 2.3vw,3.1rem)/1.2 var(--serif);margin:14px 0 14px}
.z-sec-head>p:last-child{font-size:16.5px;color:var(--ink-2);max-width:40em}

/* Starting-point picker */
.z-picker{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:0;align-items:start}
.z-tabs{display:none}
.home-ready .z-tabs{display:flex;flex-direction:column;position:sticky;top:96px}
.z-tabs [role=tab]{position:relative;display:grid;grid-template-columns:42px 1fr;grid-template-areas:"no q" "no a";text-align:left;padding:18px 26px 18px 14px;border-top:1px solid var(--rule);transition:background .25s}
.z-tabs [role=tab]:last-child{border-bottom:1px solid var(--rule)}
.z-tabs [role=tab]:hover{background:rgba(21,23,28,.035)}
.z-tab-no{grid-area:no;font:500 13px/1.9 var(--mono);color:var(--ink-3)}
.z-tab-q{grid-area:q;font:600 clamp(17px,1.5vw,20px)/1.45 var(--serif)}
.z-tab-a{grid-area:a;font-size:13.5px;color:var(--ink-3);margin-top:3px}
.z-tabs [aria-selected=true]{background:var(--sheet)}
.z-tabs [aria-selected=true] .z-tab-no,.z-tabs [aria-selected=true] .z-tab-a{color:var(--seal)}
.z-tabs [aria-selected=true]::before{content:"";position:absolute;left:0;top:-1px;bottom:-1px;width:3px;background:var(--seal)}
.z-tabs [aria-selected=true]::after{content:"";position:absolute;left:100%;top:50%;width:23px;height:1.5px;background:var(--seal);transform-origin:left;animation:z-leader .5s var(--ease) both}
.z-panels{display:grid;gap:28px}
.home-ready .z-panels{display:block;padding-left:22px}
.z-panel{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,300px);grid-template-areas:"head art" "sum art" "io io" "next next" "files files" "actions actions" "fine fine";column-gap:32px;background:var(--sheet);border:1px solid var(--rule);border-radius:4px;padding:clamp(22px,3vw,38px);box-shadow:0 30px 60px -45px rgba(70,50,20,.35);outline:none}
.home-ready .z-panel:not([hidden]){animation:z-panel .5s var(--ease) both}
.z-panel:focus-visible{outline:2px solid var(--seal);outline-offset:3px}
.z-panel-head{grid-area:head;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.z-panel-head .z-tab-no{font-size:14px}
.z-panel-head h3{font:700 clamp(24px,2.3vw,30px)/1.25 var(--serif)}
.z-status{font-size:12.5px;font-weight:600;padding:3px 10px;border:1px solid var(--rule);border-radius:999px;color:var(--ink-2)}
.z-status.is-open{border-color:transparent;background:var(--seal-soft);color:var(--seal-deep)}
.z-status.is-open::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--seal);margin-right:6px;vertical-align:1px}
.z-panel-sum{grid-area:sum;font-size:16.5px;line-height:1.85;color:var(--ink-2);margin-top:14px;align-self:start}
.z-art{grid-area:art;width:100%;height:auto;align-self:center}
.z-io{grid-area:io;display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:28px;padding-top:24px;border-top:1px solid var(--rule-2)}
.z-io h4{font:600 12.5px/1 var(--sans);letter-spacing:.14em;color:var(--ink-3);margin-bottom:14px}
.z-io li{position:relative;padding-left:22px;font-size:15px;line-height:1.7;margin-bottom:9px}
.z-io div:first-child li::before{content:"";position:absolute;left:3px;top:.72em;width:7px;height:7px;border:1.5px solid var(--ink-3);border-radius:1px}
.z-io div:last-child li::before{content:"✓";position:absolute;left:0;top:0;color:var(--seal);font-weight:700}
.z-next{grid-area:next;margin-top:18px;font-size:15px;color:var(--ink-2)}
.z-next b{display:inline-block;margin-right:12px;font:600 12.5px/1 var(--sans);letter-spacing:.14em;color:var(--ink-3)}
.z-files{grid-area:files;display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.z-files span{font:500 12.5px/1 var(--mono);padding:8px 10px 8px 26px;border:1px solid var(--rule);border-radius:4px;background:var(--paper) no-repeat 9px 50%/11px 13px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 11 13'%3E%3Cpath d='M1 .5h6l3.5 3.5v8.5H1z' fill='none' stroke='%2362656b'/%3E%3Cpath d='M3 6.5h5M3 8.5h5M3 10.5h3' stroke='%2362656b'/%3E%3C/svg%3E");color:var(--ink-2)}
.z-actions{grid-area:actions;display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.z-fine{grid-area:fine;margin-top:16px;font-size:13px;color:var(--ink-3)}

/* Line-drawing art */
.at{font:500 13px var(--sans)!important;fill:var(--ink-2);text-anchor:middle}
.at.l{text-anchor:start}.at.r{text-anchor:end}.at.s{fill:var(--seal)}
.at.tn{font:600 13px var(--mono)!important}
.ln{fill:none;stroke:var(--ink);stroke-width:1.6;stroke-linejoin:round;stroke-linecap:round}
.ln.fillp{fill:var(--sheet)}
.lsoft{fill:none;stroke:var(--ink-3);stroke-width:1.3;stroke-linecap:round}
.lsoft.fillp{fill:var(--sheet)}
.lseal{fill:none;stroke:var(--seal);stroke-width:1.8;stroke-linecap:round}
.lseal.dot{stroke-dasharray:2 5}
.dotk{fill:var(--ink)}.dotp{fill:var(--sheet);stroke:var(--ink);stroke-width:1.6}.dots{fill:var(--seal)}
.hlt{fill:var(--mark);opacity:.75}
.home-ready .draw:not(.dot){stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset 1s cubic-bezier(.6,.05,.2,1) var(--d,0ms)}
.home-ready .draw.dot{opacity:0;transition:opacity .6s var(--d,0ms)}
.home-ready .is-drawn .draw:not(.dot){stroke-dashoffset:0}
.home-ready .is-drawn .draw.dot{opacity:1}

/* Samples */
.z-synth{display:flex;gap:14px;align-items:baseline;max-width:880px;margin:-12px 0 32px;font-size:14px;line-height:1.8;color:var(--ink-2)}
.z-synth b{flex:none;font-size:12.5px;letter-spacing:.1em;color:var(--seal-deep);border:1.5px solid var(--seal);padding:2px 9px;border-radius:3px;transform:rotate(-2deg)}
.z-viewer{position:relative}
.z-vtabs{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.z-vtabs [role=tab]{flex:none;padding:13px 20px;font-size:15px;font-weight:600;color:var(--ink-3);border:1px solid transparent!important;border-bottom:0!important;border-radius:6px 6px 0 0!important;transition:color .2s,background .2s}
.z-vtabs [role=tab]:hover{color:var(--ink)}
.z-vtabs [aria-selected=true]{background:var(--sheet);color:var(--ink);border-color:var(--rule)!important;box-shadow:inset 0 2px 0 var(--seal)}
.z-doc{background:var(--sheet);border:1px solid var(--rule);border-radius:0 6px 6px 6px;padding:clamp(22px,3.4vw,48px);box-shadow:0 40px 80px -50px rgba(70,50,20,.4);margin-top:-1px;outline:none}
.z-doc+.z-doc{margin-top:24px}
.home-ready .z-doc+.z-doc{margin-top:-1px}
.home-ready .z-doc:not([hidden]){animation:z-panel .5s var(--ease) both}
.z-doc:focus-visible{outline:2px solid var(--seal);outline-offset:3px}
.z-doc-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:clamp(24px,4vw,56px);align-items:start}
.z-doc-claims,.z-doc-reply{grid-template-columns:minmax(0,1fr) minmax(200px,280px)}
.z-docfig svg{display:block;width:100%;height:auto;overflow:visible}
.z-docfig figcaption{margin-top:8px;font:500 13px var(--serif);text-align:center;color:var(--ink-2)}
.z-doctext{font:400 16px/2 var(--serif);color:var(--ink)}
.z-doctext>p+p{margin-top:12px}
.z-doc-title{font:700 13px/1 var(--sans)!important;letter-spacing:.16em;color:var(--ink-3);margin-bottom:16px!important}
.z-parts{width:100%;margin-top:22px;border-collapse:collapse;font:500 13.5px/1.5 var(--sans)}
.z-parts caption{text-align:left;font:600 12.5px var(--sans);letter-spacing:.14em;color:var(--ink-3);padding-bottom:8px}
.z-parts th{font-weight:600;text-align:left;color:var(--ink-3);font-size:12.5px;border-bottom:1.5px solid var(--ink);padding:6px 8px}
.z-parts td{padding:7px 8px;border-bottom:1px solid var(--rule-2);transition:background .2s}
.z-parts td:first-child{font-family:var(--mono);font-weight:700}
.z-parts td:nth-child(3){color:var(--seal)}
.z-parts tr.is-on td{background:var(--seal-soft)}
.z-claims li{padding:14px 0;border-bottom:1px dashed var(--rule)}
.z-claims li:first-child{padding-top:0}
.z-claims b{font-family:var(--mono);margin-right:4px}
.z-claims mark{background:linear-gradient(transparent 55%,rgba(244,220,106,.8) 55%);color:inherit}
.z-tree{border-left:1px solid var(--rule);padding-left:clamp(18px,2.4vw,32px)}
.z-tree svg{width:100%;max-width:220px;height:auto;display:block;margin:10px 0 12px}
.z-note-h{font:600 12.5px var(--sans);letter-spacing:.14em;color:var(--ink-3)}
.z-note{font-size:13.5px;line-height:1.8;color:var(--ink-2)}
.z-oa{font:400 14.5px/1.85 var(--sans)!important;color:var(--ink-2);background:var(--paper);border-left:3px solid var(--ink);padding:12px 16px;margin-bottom:24px!important}
.z-oa b{display:block;font-size:12.5px;letter-spacing:.12em;color:var(--ink-3)}
.z-h{display:block;font:700 15.5px/1.8 var(--serif);margin-bottom:2px}
.z-cite{font:600 .82em var(--mono);color:var(--seal-deep);border-bottom:1.5px dotted var(--seal);padding:0 2px}
.z-margin{display:grid;gap:16px;align-content:start;padding-top:100px}
.z-anno{position:relative;font-size:14px;line-height:1.75;color:var(--seal-deep);border-left:1.5px solid var(--seal);padding:2px 0 2px 14px}
.z-anno span{display:block;font:700 12.5px var(--sans);letter-spacing:.1em;margin-bottom:3px}
.z-doc>.z-files{margin-top:30px;padding-top:20px;border-top:1px solid var(--rule-2)}

/* Process & fees */
.z-process-grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(28px,5vw,72px);align-items:start}
.z-steps{counter-reset:s;position:relative}
.z-steps::before{content:"";position:absolute;left:27px;top:24px;bottom:24px;width:1px;background:var(--rule)}
.z-steps li{position:relative;display:grid;grid-template-columns:56px 1fr;gap:20px;padding:0 0 30px}
.z-step-no{position:relative;display:grid;place-items:center;width:56px;height:56px;border-radius:50%;background:var(--sheet);border:1.5px solid var(--ink);font:600 15px var(--mono)}
.z-steps li:nth-child(3) .z-step-no{border-color:var(--seal);color:var(--seal)}
.z-steps h3{font:700 20px/1.5 var(--serif);margin:12px 0 6px}
.z-steps p{color:var(--ink-2);font-size:15.5px}
.z-status-card{position:sticky;top:100px;background:var(--sheet);border:1px solid var(--rule);border-radius:6px;padding:24px 26px;box-shadow:0 30px 60px -45px rgba(70,50,20,.4)}
.z-status-top{display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--ink-3);letter-spacing:.1em}
.z-demo-tag{font-size:12px;letter-spacing:.1em;border:1px dashed var(--ink-3);padding:1px 8px;border-radius:3px}
.z-status-title{font:700 22px/1.5 var(--serif);margin:10px 0 18px;min-height:1.5em}
.z-status-list li{position:relative;padding:7px 0 7px 26px;font-size:14.5px;color:var(--ink-3);transition:color .3s}
.z-status-list li::before{content:"";position:absolute;left:4px;top:15px;width:8px;height:8px;border-radius:50%;border:1.5px solid var(--ink-3);background:var(--sheet);transition:all .3s}
.z-status-list li.is-done{color:var(--ink-2)}
.z-status-list li.is-done::before{background:var(--ink);border-color:var(--ink)}
.z-status-list li.is-now{color:var(--seal-deep);font-weight:600}
.z-status-list li.is-now::before{background:var(--seal);border-color:var(--seal);box-shadow:0 0 0 5px var(--seal-soft);animation:z-breathe 1.6s ease-in-out infinite}
.z-status-foot{margin-top:16px;padding-top:14px;border-top:1px solid var(--rule-2);font-size:12.5px;line-height:1.7;color:var(--ink-3)}
.z-tiers{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:clamp(28px,4vw,48px)}
.z-tier{padding:22px 24px;border:1px solid var(--rule);border-radius:6px;background:linear-gradient(var(--sheet),var(--sheet)) padding-box}
.z-tier h3{font:700 18px var(--serif);margin-bottom:6px}
.z-tier p{font-size:15px;color:var(--ink-2)}
.z-tier-note{grid-column:1/-1;font-size:13.5px;color:var(--ink-3)}

/* Division of work */
.z-roles{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--rule);border-radius:6px;overflow:hidden}
.z-role{padding:clamp(24px,3.4vw,44px);background:var(--sheet)}
.z-role h3{font:700 22px var(--serif);margin-bottom:18px}
.z-role li{padding:12px 0;border-top:1px solid var(--rule-2);font-size:16px}
.z-role-you{background:var(--ink);color:var(--paper)}
.z-role-you h3{color:var(--paper)}
.z-role-you li{border-top-color:rgba(243,239,230,.16)}
.z-role-you li::before{content:"";display:inline-block;width:7px;height:7px;margin-right:12px;border:1.5px solid var(--seal);transform:rotate(45deg);vertical-align:2px}
.z-privacy{margin-top:22px;max-width:880px;font-size:14px;line-height:1.85;color:var(--ink-3)}

/* FAQ */
.z-qa{max-width:900px;border-top:1.5px solid var(--ink)}
.z-qa details{border-bottom:1px solid var(--rule)}
.z-qa summary{position:relative;list-style:none;cursor:pointer;padding:22px 50px 22px 0;font:600 clamp(17px,1.4vw,19px)/1.5 var(--serif);transition:color .2s}
.z-qa summary::-webkit-details-marker{display:none}
.z-qa summary:hover{color:var(--seal-deep)}
.z-qa summary::after,.z-qa summary::before{content:"";position:absolute;right:10px;top:50%;width:16px;height:1.5px;background:var(--ink);transition:transform .35s var(--ease)}
.z-qa summary::before{transform:rotate(90deg)}
.z-qa details[open] summary::before{transform:rotate(0)}
.z-qa details>div{padding:0 50px 22px 0;color:var(--ink-2);font-size:15.5px}
.z-qa details>div p+p{margin-top:8px}

/* Closing */
.z-end{position:relative;max-width:var(--wrap);margin:clamp(80px,10vw,140px) auto 0;padding:0 var(--gut)}
.z-end-inner{position:relative;overflow:hidden;background:var(--sheet);border:1px solid var(--rule);border-radius:6px;padding:clamp(40px,6vw,84px) clamp(24px,5vw,72px);box-shadow:0 40px 80px -55px rgba(70,50,20,.45)}
.z-end-inner::after{content:"知";position:absolute;right:clamp(-20px,2vw,40px);top:50%;transform:translateY(-50%) rotate(-6deg);display:grid;place-items:center;width:clamp(150px,20vw,240px);aspect-ratio:1;border:4px solid var(--seal);border-radius:10px;box-shadow:inset 0 0 0 7px var(--sheet),inset 0 0 0 9px var(--seal);font:700 clamp(90px,12vw,150px)/1 var(--serif);color:var(--seal);opacity:.12;pointer-events:none}
.z-end h2{font:700 clamp(2rem,1.2rem + 2.6vw,3.4rem)/1.2 var(--serif);max-width:12em}
.z-end p{margin-top:14px;font-size:17px;color:var(--ink-2)}
.z-foot{max-width:var(--wrap);margin:0 auto;padding:44px var(--gut) 56px;display:flex;flex-wrap:wrap;align-items:center;gap:18px 32px;font-size:13.5px;color:var(--ink-3)}
.z-foot nav{display:flex;gap:18px;margin-left:auto}
.z-foot nav a:hover{color:var(--ink)}
.z-noscript{max-width:var(--wrap);margin:0 auto 30px;padding:0 var(--gut);font-size:13px;color:var(--ink-3)}

/* Scroll reveal only once the homepage module is running */
.home-ready [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.home-ready [data-reveal].is-in{opacity:1;transform:none}

@keyframes z-rise{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}
@keyframes z-sheet{from{opacity:0;transform:translateY(26px) rotate(.6deg)}to{opacity:1;transform:none}}
@keyframes z-lead{from{stroke-dashoffset:1}to{stroke-dashoffset:0}}
@keyframes z-leader{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes z-panel{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes z-breathe{50%{opacity:.45}}

@media (max-width:1080px){
 .z-nav a{padding:8px 10px}
 .z-panel{grid-template-columns:1fr;grid-template-areas:"head" "sum" "art" "io" "next" "files" "actions" "fine"}
 .z-art{max-width:380px;margin-top:22px}
}
@media (max-width:900px){
 .z-head{gap:14px}
 .z-menu{display:block}
 .z-nav{position:absolute;left:0;right:0;top:100%;flex-direction:column;gap:0;padding:8px var(--gut) 16px;background:var(--paper);border-bottom:1px solid var(--rule);box-shadow:0 30px 40px -30px rgba(40,30,10,.3);display:none}
 .z-head.is-open .z-nav{display:flex}
 .z-nav a{padding:14px 4px;font-size:16px;border-bottom:1px solid var(--rule-2)}
 .z-nav a::after{display:none}
 .z-nav-work{color:var(--seal-deep)!important;font-weight:600}
 .z-head-actions{margin-left:auto}
 .z-hero{grid-template-columns:1fr}
 .z-picker{grid-template-columns:1fr}
 .home-ready .z-tabs{position:static;flex-direction:row;overflow-x:auto;scroll-snap-type:x mandatory;gap:8px;padding-bottom:12px;margin:0 calc(var(--gut)*-1);padding-inline:var(--gut);scrollbar-width:thin}
 .z-tabs [role=tab]{flex:0 0 min(62vw,230px);scroll-snap-align:start;border:1px solid var(--rule)!important;border-radius:6px!important;padding:14px 14px 14px 12px;grid-template-columns:32px 1fr}
 .z-tabs [role=tab]:last-child{border-bottom:1px solid var(--rule)}
 .z-tabs [aria-selected=true]::after{display:none}
 .z-tabs [aria-selected=true]::before{left:12px;right:12px;top:auto;bottom:-1px;width:auto;height:3px;border-radius:2px}
 .home-ready .z-panels{padding-left:0;margin-top:10px}
 .z-doc-grid,.z-doc-claims,.z-doc-reply{grid-template-columns:1fr}
 .z-tree{border-left:0;border-top:1px solid var(--rule);padding:18px 0 0}
 .z-margin{padding-top:0}
 .z-process-grid{grid-template-columns:1fr}
 .z-status-card{position:static}
}
@media (max-width:620px){
 .z-home{font-size:15.5px}
 .z-head{height:62px}
 .z-head-actions .z-btn{display:none}
 .z-head.is-open .z-nav-work{display:block}
 .z-brand-name small{display:none}
 .z-display{margin:16px 0 20px}
 .z-cta .z-btn{flex:1 1 auto}
 .z-sheet-bar{flex-wrap:wrap;row-gap:8px}
 .z-sheet-meta{order:3;margin-left:0;width:100%}
 .z-sheet-btn{margin-left:auto}
 .z-quick{flex-wrap:nowrap;overflow-x:auto;margin:0 calc(var(--gut)*-1);padding-inline:var(--gut);scrollbar-width:none}
 .z-quick a{flex:none}
 .z-quick-q{flex:none}
 .z-io{grid-template-columns:1fr;gap:10px}
 .z-actions .z-btn{flex:1 1 100%}
 .z-tiers,.z-roles{grid-template-columns:1fr}
 .z-steps li{grid-template-columns:44px 1fr;gap:14px}
 .z-step-no{width:44px;height:44px;font-size:13px}
 .z-steps::before{left:21px}
 .z-steps h3{margin-top:7px}
 .z-synth{flex-direction:column;gap:8px}
 .z-foot nav{margin-left:0;flex-wrap:wrap}
 .z-end h2{font-size:1.75rem}
 .z-end-inner::after{display:none}
}
@media (hover:none){.z-mech .xh,.z-mech .xt{display:none}}
@media (prefers-reduced-motion:reduce){
 html:has(body.home-active){scroll-behavior:auto}
 .z-home *,.z-home *::before,.z-home *::after{animation-duration:.001ms!important;animation-delay:0s!important;animation-iteration-count:1!important;transition-duration:.001ms!important;transition-delay:0s!important}
 .home-ready [data-reveal]{opacity:1;transform:none}
}

/* Workspace shell and login, restyled to continue the homepage language */
.entry-header{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 5%;background:#fff;border-bottom:1px solid #dee5de;color:#304d42;font-size:14px}
.entry-header a{color:#36594a}
.preview-banner{padding:10px 5%;font-size:12px;color:#79613e;background:#faf5e9;border-bottom:1px solid #eadebc}
.entry-error{margin:20px auto;padding:15px;max-width:800px;color:#8b4938;background:#fff3ed}
.entry-projects{max-width:1000px;margin:55px auto;padding:0 25px}
.entry-projects h1{font-size:30px}
.entry-projects .empty-projects{padding:55px;border:1px solid #dce6de;background:#fff;border-radius:12px;text-align:center;margin-top:30px}
.entry-login-tools{font-size:12px;border-top:1px solid #dde4dc;padding-top:20px;margin-top:20px}
.entry-login-tools button{margin-top:10px;background:#e6eee6;color:#234d3b;width:100%}
.entry-beta-notice{font-size:13px;line-height:1.8;background:#f6f0e2;border:1px solid #e7dabc;padding:14px 18px;border-radius:7px;margin-bottom:25px}
#workspace>.entry-header{position:sticky;top:0;z-index:40;isolation:isolate}
#workspace a:focus-visible,#workspace button:focus-visible{outline:2px solid #38679a;outline-offset:3px}
#workspace .entry-header{z-index:40}
@media(min-width:681px){#workspace>.shell>.sidebar{position:sticky;inset:72px auto auto 0;height:calc(100svh - 72px);align-self:start}}
@media(max-width:760px){.entry-header{padding-inline:5%;height:63px;font-size:12px}.entry-projects{margin-top:30px}.entry-projects .empty-projects{padding:28px 18px}}
#workspace:has(.login)>.entry-header{background:#f3efe6;border-bottom-color:rgba(21,23,28,.12);color:#15171c}
#workspace:has(.login)>.entry-header a{color:#15171c}
#workspace .login .login-art{background:#f3efe6 linear-gradient(rgba(21,23,28,.03) 1px,transparent 1px) 0 0/100% 24px;color:#15171c;border-right-color:rgba(21,23,28,.12)}
#workspace .login .login-art::after{content:"知";display:grid;place-items:center;font:700 92px/1 "Noto Serif SC","Noto Serif CJK SC","Songti SC",serif;color:#c4371a;width:150px;height:150px;right:10%;bottom:8%;border:3px solid #c4371a;border-radius:10px;box-shadow:inset 0 0 0 7px #f3efe6,inset 0 0 0 9px #c4371a;transform:rotate(-6deg);opacity:.16}
#workspace .login .login-copy h1{font-family:"Noto Serif SC","Noto Serif CJK SC","Source Han Serif SC","Songti SC","STSong",serif;font-weight:700;letter-spacing:0;color:#15171c}
#workspace .login .login-copy p,#workspace .login .login-art .brand em{color:#40444b}
#workspace .login .login-copy .eyebrow{color:#c4371a}
#workspace .login .login-art .bottom{color:#62656b}
@media(max-width:760px){#workspace .login .login-art::after{display:none}}