/* Spare · 工作方式 (how.html) — page-scoped styles. Prefixes: hw- (page), v1-v4 (step visuals), au- (auto chain), nt- (24h), st- (stairs) */

body.page-how{background:#fff}
.page-how .ft{display:inline-block;font-style:normal;font-family:var(--mono);font-size:10px;font-weight:500;line-height:1.5;color:#fff;background:var(--tc,#195ff9);border-radius:4px;padding:1px 5px;min-width:36px;text-align:center;letter-spacing:.02em;flex:none}
.page-how .ft-dwg{--tc:#195ff9}.page-how .ft-pdf{--tc:#e5484d}.page-how .ft-xls{--tc:#2f8a2f}.page-how .ft-tif{--tc:#6c5ce7}

/* =================== HERO =================== */
.hw-hero{position:relative;overflow:hidden;padding:70px 0 84px;background:#fff}
.hw-hero-bg{position:absolute;inset:0;pointer-events:none;background:#fff}
.hw-hero-svg{position:absolute;left:-6px;top:-6px;width:calc(100% + 12px);height:calc(100% + 12px);display:block}
.hw-hs{transform-box:fill-box;transform-origin:center}
.hw-hs.s1{animation:hsA 26s ease-in-out infinite alternate}
.hw-hs.s2{animation:hsB 30s ease-in-out infinite alternate}
.hw-hs.s3,.hw-hs.s4{animation:hwRiv 18s ease-in-out infinite alternate}
.hw-hs.s5{animation:hsC 24s ease-in-out -6s infinite alternate}
.hw-hs.s6{animation:hsB 22s ease-in-out -8s infinite alternate-reverse}
@keyframes hwRiv{to{transform:translate(46px,-16px)}}
.hw-hero-in{position:relative}
.hw-hero-top{display:flex;align-items:flex-end;justify-content:space-between;gap:40px}
.hw-tag{display:inline-flex;align-items:center;gap:10px;margin:0 0 20px;padding:6px 15px 6px 12px;border-radius:var(--pill);background:rgba(255,255,255,.75);border:1px solid rgba(25,95,249,.18);font-size:13px;color:var(--ink-2);letter-spacing:.02em;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);box-shadow:0 6px 18px -12px rgba(25,95,249,.5)}
.hw-tag i{width:6px;height:6px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 4px rgba(25,95,249,.15)}
.hw-h1{display:block;margin:0;font-family:"Instrument Sans","Noto Sans SC",var(--font);font-size:104px;line-height:1.04;font-weight:600;letter-spacing:-.02em;color:#14214a;padding-bottom:.04em}
.hw-h1{background:linear-gradient(100deg,#0f1f4d 0%,#1a3fa8 34%,#195ff9 64%,#6d9bff 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;width:max-content}
.hw-sub{margin:16px 0 0;font-size:19px;letter-spacing:-.005em;color:#3d4a66}
.hw-tabs-w{display:flex;flex-direction:column;align-items:flex-end;gap:12px;padding-bottom:2px}
.hw-tabs-k{margin:0;font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:#33456e}
.hw-tabs{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end;max-width:600px}
.hw-tb{position:relative;overflow:hidden;display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 16px 0 8px;border-radius:var(--pill);border:1px solid rgba(255,255,255,.95);background:rgba(255,255,255,.6);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font-size:14px;color:var(--ink-2);cursor:pointer;transition:background .25s,border-color .25s,color .25s,box-shadow .25s,transform .25s var(--ease)}
.hw-tb i{width:20px;height:20px;border-radius:50%;background:radial-gradient(circle at 30% 30%,var(--c1),var(--c2));flex:none}
.hw-tb:hover{background:rgba(255,255,255,.9);transform:translateY(-1px)}
.hw-tb[aria-selected="true"]{background:#fff;color:#14214a;border-color:var(--blue-3);box-shadow:0 12px 26px -14px rgba(25,95,249,.75)}
.hw-tb s{position:absolute;left:14px;right:14px;bottom:4px;height:2px;border-radius:2px;overflow:hidden;opacity:0;background:rgba(25,95,249,.12)}
.hw-tb[aria-selected="true"] s{opacity:1}
.hw-tb s::after{content:"";position:absolute;inset:0;background:var(--blue);transform:scaleX(0);transform-origin:left}
.hw-tb.run s::after{animation:hwTab var(--dur,8s) linear forwards}
@keyframes hwTab{to{transform:scaleX(1)}}

/* stage: task card · wave chain · output files */
.hw-stage{position:relative;height:380px;margin-top:34px}
.hw-rib{position:absolute;left:0;top:0;width:100%;height:100%;overflow:visible;transition:opacity .35s var(--ease)}
.hw-stage.swap .hw-rib{opacity:.2}
.hw-rib-glow{fill:none;stroke:rgba(25,95,249,.26);stroke-width:20}
.hw-rib-base{fill:none;stroke:rgba(25,95,249,.35);stroke-width:1.6;stroke-dasharray:2 7}
.hw-rib-prog{fill:none;stroke:url(#hwRibG);stroke-width:3;stroke-linecap:round}
#hwPts{filter:drop-shadow(0 0 4px rgba(25,95,249,.9))}
#hwPts circle{fill:#fff;stroke:#195ff9;stroke-width:1.4}
.hw-zl{margin:0 0 10px 4px;display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:#33456e}
.hw-zl::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 3px rgba(25,95,249,.14)}
.hw-zl-c{position:absolute;left:50%;top:4px;transform:translateX(-50%);margin:0;padding:5px 12px;border-radius:var(--pill);background:rgba(255,255,255,.6);border:1px solid rgba(255,255,255,.9);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.hw-task{position:absolute;left:0;top:196px;width:292px;transform:translateY(-50%)}
.hw-outs{position:absolute;right:0;top:196px;width:292px;transform:translateY(-50%)}
.hw-card{background:rgba(255,255,255,.8);border:1px solid rgba(255,255,255,.95);border-radius:16px;padding:16px;backdrop-filter:blur(16px) saturate(1.3);-webkit-backdrop-filter:blur(16px) saturate(1.3);box-shadow:0 34px 60px -34px rgba(15,50,160,.5),inset 0 1px 0 #fff;transition:opacity .35s var(--ease),transform .35s var(--ease)}
.hw-nodes{position:absolute;inset:0;pointer-events:none;transition:opacity .35s var(--ease)}
.hw-stage.swap .hw-card,.hw-stage.swap .hw-nodes{opacity:0;transform:translateY(6px)}
.hw-app{margin:0;display:inline-flex;align-items:center;gap:8px;font-size:12.5px;color:var(--ink-2);padding:3px 12px 3px 4px;border-radius:var(--pill);background:#fff;border:1px solid var(--line)}
.hw-app i{width:18px;height:18px;border-radius:50%;background:radial-gradient(circle at 30% 30%,var(--c1,#ffe08a),var(--c2,#f5a524))}
.hw-tt{margin:14px 0 0;display:flex;align-items:center;min-height:32px;font-size:21px;font-weight:500;letter-spacing:-.01em;color:#14214a;white-space:nowrap}
.hw-caret{display:inline-block;width:1.5px;height:22px;margin-left:3px;background:var(--blue);animation:hwCaret 1s steps(1) infinite}
@keyframes hwCaret{50%{opacity:0}}
.hw-par{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px;min-height:25px}
.hw-par span{font-size:12.5px;color:#1747b8;background:var(--blue-soft);border-radius:6px;padding:3px 9px;opacity:0;transform:translateY(4px);transition:opacity .35s,transform .35s var(--ease)}
.hw-par.on span{opacity:1;transform:none}
.hw-par.on span+span{transition-delay:.08s}
.hw-ins{display:grid;gap:6px;margin-top:14px}
.hw-ins span{display:flex;align-items:center;gap:9px;height:38px;padding:0 10px 0 8px;border-radius:10px;background:#fff;border:1px solid var(--line);font-size:13px;color:var(--ink-2);opacity:0;transform:translateY(6px);transition:opacity .4s,transform .4s var(--ease)}
.hw-ins span.on{opacity:1;transform:none}
.hw-oc{padding:10px}
.hw-oc ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.hw-oc li{display:flex;align-items:center;gap:10px;height:44px;padding:0 12px 0 9px;border-radius:10px;border:1px dashed #c6d5f6;background:rgba(255,255,255,.35);font-size:13.5px;color:transparent;transition:background .4s,border-color .4s,color .4s,box-shadow .4s}
.hw-oc li .ft,.hw-oc li svg{opacity:0;transition:opacity .3s}
.hw-oc li svg{margin-left:auto;width:16px;height:16px;color:var(--blue)}
.hw-oc li.on{background:#fff;border:1px solid var(--line);color:#14214a;box-shadow:0 12px 22px -18px rgba(20,40,120,.5);animation:hwIn .5s var(--ease)}
.hw-oc li.on .ft,.hw-oc li.on svg{opacity:1}
@keyframes hwIn{from{transform:translateX(-12px) scale(.97)}}
.hw-n{position:absolute;width:150px;display:flex;flex-direction:column;align-items:center;text-align:center;transform:translate(-50%,-34px)}
.hw-n .c{position:relative;width:68px;height:68px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.88);border:1px solid #fff;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);box-shadow:0 16px 30px -16px rgba(15,50,160,.6),0 0 0 7px rgba(255,255,255,.4);transition:transform .45s var(--ease),box-shadow .45s}
.hw-n .c i{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;background:linear-gradient(135deg,var(--c1),var(--c2));box-shadow:inset 0 1px 0 rgba(255,255,255,.45),0 6px 12px -6px var(--c2)}
.hw-n .c i svg{width:18px;height:18px;stroke:#fff;stroke-width:1.6}
.hw-n .c::after{content:"";position:absolute;inset:-7px;border-radius:50%;border:2px solid transparent}
.hw-n.act .c{transform:scale(1.07);box-shadow:0 18px 34px -14px rgba(25,95,249,.85),0 0 0 9px rgba(25,95,249,.14)}
.hw-n.act .c::after{border-color:var(--blue) transparent var(--blue) transparent;animation:spin 1s linear infinite}
.hw-n .ok{position:absolute;right:-3px;top:-3px;width:22px;height:22px;border-radius:50%;background:var(--blue);border:2px solid #fff;transform:scale(0);transition:transform .35s var(--ease)}
.hw-n .ok::after{content:"";position:absolute;left:6.5px;top:3.5px;width:4px;height:8px;border:solid #fff;border-width:0 1.6px 1.6px 0;transform:rotate(45deg)}
.hw-n.done .ok{transform:scale(1)}
.hw-n b{margin-top:14px;padding:3px 11px;border-radius:var(--pill);font-size:14.5px;font-weight:600;color:#14214a;background:rgba(255,255,255,.72);border:1px solid rgba(255,255,255,.9);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);white-space:nowrap}
.hw-n small{margin-top:5px;font-size:12.5px;color:#33456e;white-space:nowrap}

/* =================== SECTION HEADS =================== */
.hw-head{display:grid;grid-template-columns:1fr 1fr;gap:32px 80px;align-items:end;margin-bottom:64px}
.hw-head-r{justify-self:end;width:100%;max-width:520px}
.hw-lead{margin:0;font-size:17px;line-height:1.75;color:var(--ink-2)}
.hw-head-c{display:block;text-align:center;margin-bottom:56px}
.hw-head-btn{display:flex;justify-content:flex-end}
.hw-sw{display:flex;align-items:center;margin-top:18px}
.hw-sw span{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;font-weight:500;background:#fff;border:1px solid var(--line-2);border-radius:var(--pill);padding:6px 14px 6px 7px;box-shadow:0 8px 16px -12px rgba(0,0,0,.3);white-space:nowrap}
.hw-sw span i{width:16px;height:16px;border-radius:5px;background:linear-gradient(135deg,var(--c1),var(--c2))}
.hw-sw b{position:relative;flex:1;min-width:20px;max-width:64px;height:1px;background:linear-gradient(90deg,var(--line-2),var(--blue-3))}
.hw-sw b::after{content:"";position:absolute;right:0;top:-3px;width:6px;height:6px;border-top:1px solid var(--blue-3);border-right:1px solid var(--blue-3);transform:rotate(45deg)}

/* =================== PV TIMELINE =================== */
body.page-how .hw-pv{padding:120px 0 100px;background:#fff}
.hw-tl{position:relative}
.hw-rail{position:absolute;left:50%;top:0;width:2px;height:0;margin-left:-1px;border-radius:2px;background:#e4e9f4}
.hw-rail-fill{position:absolute;inset:0;border-radius:2px;background:linear-gradient(180deg,#9cbcff,#195ff9);transform-origin:top;transform:scaleY(var(--p,0));box-shadow:0 0 14px rgba(25,95,249,.45)}
.hw-rail-head{position:absolute;left:50%;top:calc(var(--p,0) * 100%);width:14px;height:14px;margin:-7px 0 0 -7px;border-radius:50%;background:#fff;border:3px solid var(--blue);box-shadow:0 0 0 6px rgba(25,95,249,.14),0 0 22px rgba(25,95,249,.7)}
.hw-step{position:relative;display:grid;grid-template-columns:1fr 120px 1fr;grid-template-areas:"txt node viz";align-items:center;padding:40px 0}
.hw-step:nth-of-type(even){grid-template-areas:"viz node txt"}
.hw-node{grid-area:node;justify-self:center;position:relative;z-index:2;width:56px;height:56px;border-radius:50%;display:grid;place-items:center;background:#fff;border:1px solid var(--line-2);font-family:var(--mono);font-size:14px;font-weight:500;color:var(--soft);transition:background .5s var(--ease),border-color .5s,color .5s,box-shadow .5s}
.hw-node::before{content:"";position:absolute;top:50%;left:100%;width:32px;height:1px;background:repeating-linear-gradient(90deg,var(--line-2) 0 3px,transparent 3px 6px);transition:background .5s}
.hw-step:nth-of-type(even) .hw-node::before{left:auto;right:100%}
.hw-node::after{content:"";position:absolute;inset:-1px;border-radius:50%;border:1.5px solid var(--blue);opacity:0}
.hw-step.lit .hw-node{background:linear-gradient(135deg,#4f86ff,#195ff9);border-color:var(--blue);color:#fff;box-shadow:0 0 0 8px rgba(25,95,249,.1),0 14px 28px -12px rgba(25,95,249,.8)}
.hw-step.lit .hw-node::before{background:repeating-linear-gradient(90deg,var(--blue-2) 0 3px,transparent 3px 6px)}
.hw-step.lit .hw-node::after{animation:hwRing 1.3s var(--ease) both}
@keyframes hwRing{0%{opacity:.8;transform:scale(1)}100%{opacity:0;transform:scale(2)}}
.hw-txt{grid-area:txt;justify-self:end;width:100%;max-width:400px;margin-right:24px;opacity:.28;transform:translateY(12px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.hw-step:nth-of-type(even) .hw-txt{justify-self:start;margin:0 0 0 24px}
.hw-step.lit .hw-txt{opacity:1;transform:none}
.hw-k{margin:0 0 12px;font-family:var(--mono);font-size:12.5px;letter-spacing:.06em;color:var(--blue)}
.hw-txt h3{margin:0;font-size:44px;line-height:1.1;font-weight:500;letter-spacing:-.02em;color:#14214a}
.hw-txt>p:not(.hw-k){margin:16px 0 0;font-size:16.5px;line-height:1.75;color:var(--muted)}
.hw-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.hw-chips span{font-family:var(--mono);font-size:12.5px;padding:4px 10px;border-radius:6px;background:var(--blue-soft);color:#1747b8}
.hw-chips-sw span{font-family:var(--font);font-size:13px;padding:4px 12px;border-radius:var(--pill);background:#fff;border:1px solid var(--line-2);color:var(--ink-2)}
.hw-viz{grid-area:viz;position:relative;height:440px;border-radius:14px;overflow:hidden;isolation:isolate;opacity:.45;filter:saturate(.2);transform:scale(.975);transition:opacity .8s var(--ease),filter .8s var(--ease),transform .8s var(--ease),box-shadow .8s var(--ease)}
.hw-step.lit .hw-viz{opacity:1;filter:none;transform:none;box-shadow:0 40px 70px -48px rgba(20,50,140,.55)}

/* ---------- V1 task card ---------- */
.v1{background:radial-gradient(70% 60% at 88% 100%,rgba(25,95,249,.16),transparent 70%),radial-gradient(60% 60% at 0% 0%,#fff,transparent 70%),linear-gradient(160deg,#edf2ff 0%,#f5f6fa 55%,#f1f0ee 100%);box-shadow:inset 0 0 0 1px #e8ecf4}
.v1-win{position:absolute;left:34px;top:32px;width:394px;background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 30px 60px -36px rgba(20,40,110,.5),0 0 0 1px rgba(20,40,110,.06)}
.v1-bar{display:flex;align-items:center;justify-content:space-between;height:46px;padding:0 12px 0 16px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,#fafbfd,#fff)}
.v1-bar p{margin:0;font-size:13.5px;font-weight:600;color:#14214a}
.v1-bar p span{margin-left:8px;font-weight:400;font-size:12.5px;color:var(--soft)}
.v1-app{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--ink-2);border:1px solid var(--line);border-radius:var(--pill);padding:2px 10px 2px 3px}
.v1-app i{width:15px;height:15px;border-radius:50%;background:radial-gradient(circle at 30% 30%,#ffe08a,#f5a524)}
.v1-f{display:grid;grid-template-columns:40px 1fr;align-items:center;gap:10px;padding:9px 16px}
.v1-f+.v1-f{border-top:1px solid #f2f3f5}
.v1-f label{font-size:12px;color:var(--soft)}
.v1-fa{align-items:start}
.v1-fa label{padding-top:4px}
.v1-in{margin:0;display:flex;align-items:center;height:36px;padding:0 12px;border-radius:8px;border:1px solid var(--line);font-size:14px;color:#14214a;white-space:nowrap}
.v1.typing .v1-in:first-of-type{border-color:var(--blue-3);box-shadow:0 0 0 3px rgba(25,95,249,.08)}
.v1-caret{display:inline-block;width:1.5px;height:17px;margin-left:2px;background:var(--blue);opacity:0}
.v1.typing .v1-caret{opacity:1;animation:hwCaret 1s steps(1) infinite}
.v1-sel{justify-content:space-between}
.v1-sel svg{width:14px;height:14px;color:var(--soft)}
.v1-files{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.v1-file{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#fff;opacity:0;transform:translateY(10px) scale(.96);transition:opacity .45s var(--ease),transform .5s var(--ease)}
.v1-file.on{opacity:1;transform:none}
.v1-th{height:62px;background:#c4cdd9;overflow:hidden}
.v1-th svg{display:block;width:100%;height:100%}
.v1-th-l{background:#fff;border-bottom:1px solid #f0f1f4}
.v1-file p{margin:0;display:flex;align-items:center;gap:6px;padding:7px 8px;font-size:11.5px;color:var(--ink-2);white-space:nowrap}
.v1-go{display:flex;align-items:center;justify-content:space-between;padding:11px 16px 13px;border-top:1px solid #f2f3f5}
.v1-on{display:inline-flex;align-items:center;gap:7px;font-size:12px;color:var(--muted)}
.v1-on i{width:7px;height:7px;border-radius:50%;background:#1f9d62;box-shadow:0 0 0 3px rgba(31,157,98,.16)}
.v1-btn{display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 13px 0 15px;border-radius:var(--pill);background:var(--blue);color:#fff;font-size:13px;box-shadow:0 10px 20px -10px rgba(25,95,249,.85);transition:transform .2s var(--ease),background .3s,box-shadow .3s}
.v1-btn b{font-weight:500}
.v1-btn svg{width:14px;height:14px;stroke:#fff}
.v1.sent .v1-btn{transform:scale(.92);background:#0f4fe6;box-shadow:0 0 0 6px rgba(25,95,249,.16)}
.v1-plan{position:absolute;right:24px;bottom:28px;width:214px;padding:14px 12px 12px;border-radius:14px;background:rgba(255,255,255,.76);border:1px solid rgba(255,255,255,.95);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 30px 50px -28px rgba(20,50,140,.6);opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.v1.plan .v1-plan{opacity:1;transform:none}
.v1-ph{margin:0 0 9px 2px;display:flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:#14214a}
.v1-ph .spark{width:16px;height:16px;color:var(--blue-2)}
.v1-plan ol{list-style:none;margin:0;padding:0;display:grid;gap:5px;counter-reset:pl}
.v1-plan li{counter-increment:pl;display:flex;align-items:center;gap:8px;padding:6px 8px;border-radius:8px;background:#fff;border:1px solid #edf0f5;font-size:12.5px;color:var(--ink-2);opacity:0;transform:translateX(10px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
.v1-plan li::before{content:counter(pl);font-family:var(--mono);font-size:11px;color:var(--blue);width:10px}
.v1-plan li i{order:2;margin-left:auto;width:13px;height:13px;border-radius:50%;border:1.5px solid var(--line-2);flex:none}
.v1.plan .v1-plan li{opacity:1;transform:none}
.v1.plan .v1-plan li:nth-child(1){transition-delay:.15s}.v1.plan .v1-plan li:nth-child(2){transition-delay:.25s}.v1.plan .v1-plan li:nth-child(3){transition-delay:.35s}.v1.plan .v1-plan li:nth-child(4){transition-delay:.45s}
.v1.plan .v1-plan li:first-child{border-color:var(--blue-3);color:#14214a}
.v1.plan .v1-plan li:first-child i{border-color:var(--blue) transparent var(--blue) var(--blue);animation:spin .9s linear infinite}

/* ---------- V2 software nodes ---------- */
.v2{color:#fff;background:radial-gradient(60% 70% at 12% 0%,#a9c7ff 0%,rgba(169,199,255,0) 60%),radial-gradient(55% 70% at 100% 100%,#0b3fd6 0%,rgba(11,63,214,0) 70%),linear-gradient(125deg,#6a9cfb 0%,#2f6cf3 52%,#1b50e4 100%)}
.v2::before{content:"";position:absolute;left:-20%;top:46%;width:80%;height:90px;transform:rotate(-24deg);background:linear-gradient(90deg,transparent,rgba(255,255,255,.32),transparent);filter:blur(24px);animation:hsG 14s ease-in-out infinite alternate;pointer-events:none}
.v2-tag{position:absolute;left:50%;top:24px;transform:translateX(-50%);margin:0;display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:var(--pill);background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.38);font-size:12.5px;white-space:nowrap;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.v2-tag i{width:6px;height:6px;border-radius:50%;background:#fff;box-shadow:0 0 10px #fff}
.v2-ln{position:absolute;inset:0;width:100%;height:100%}
.v2-base{fill:none;stroke:rgba(255,255,255,.38);stroke-width:2}
.v2-flow{fill:none;stroke:#fff;stroke-width:2.2;stroke-dasharray:6 10;opacity:0;transition:opacity .35s}
.v2-flow.on{opacity:1;animation:hwDash .8s linear infinite}
@keyframes hwDash{to{stroke-dashoffset:-32}}
.v2-n{position:absolute;width:160px;padding:10px;border-radius:14px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.34);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 24px 40px -26px rgba(0,10,60,.65);transition:background .4s,border-color .4s,box-shadow .4s,transform .45s var(--ease)}
.v2-h{display:flex;align-items:center;gap:8px;height:22px;padding:0 2px}
.v2-h i{width:16px;height:16px;border-radius:5px;background:linear-gradient(135deg,var(--c1),var(--c2));box-shadow:0 0 0 2px rgba(255,255,255,.35)}
.v2-h b{font-size:13.5px;font-weight:600}
.v2-h em{position:relative;margin-left:auto;width:16px;height:16px;border-radius:50%;border:1.5px solid rgba(255,255,255,.45)}
.v2-n.act{background:rgba(255,255,255,.26);border-color:#fff;box-shadow:0 0 0 6px rgba(255,255,255,.12),0 26px 44px -22px rgba(0,10,60,.75);transform:translateY(-3px)}
.v2-n.act .v2-h em{border-color:#fff transparent #fff #fff;animation:spin .8s linear infinite}
.v2-n.done .v2-h em{background:#fff;border-color:#fff}
.v2-n.done .v2-h em::after{content:"";position:absolute;left:4.2px;top:1.6px;width:3.5px;height:7px;border:solid var(--blue);border-width:0 1.6px 1.6px 0;transform:rotate(45deg)}
.v2-p{position:relative;margin-top:8px;height:64px;border-radius:8px;background:#fff;overflow:hidden}
.v2-p svg{display:block;width:100%;height:100%}
.v2-p::after{content:"";position:absolute;top:0;bottom:0;left:-40%;width:40%;background:linear-gradient(90deg,transparent,rgba(25,95,249,.14),transparent);opacity:0}
.v2-n.act .v2-p::after{opacity:1;animation:hwScan 1.1s linear infinite}
@keyframes hwScan{to{left:100%}}
.v2-a{margin:8px 2px 0;font-size:12px;color:rgba(255,255,255,.88)}
.v2-pk{position:absolute;left:0;top:0;padding:3px 10px;border-radius:var(--pill);background:#fff;color:#1747b8;font-size:11.5px;font-weight:500;white-space:nowrap;box-shadow:0 8px 20px -6px rgba(0,10,60,.6);opacity:0;pointer-events:none;will-change:transform}
.v2-st{position:absolute;left:28px;right:28px;bottom:22px;height:48px;display:flex;align-items:center;gap:12px;padding:0 16px;border-radius:12px;background:rgba(255,255,255,.96);color:var(--ink);box-shadow:0 20px 40px -24px rgba(0,10,60,.6)}
.v2-st>i{position:relative;width:18px;height:18px;border-radius:50%;border:2px solid var(--blue);border-right-color:transparent;animation:spin .9s linear infinite;flex:none}
.v2.fin .v2-st>i{animation:none;background:var(--blue);border-color:var(--blue)}
.v2.fin .v2-st>i::after{content:"";position:absolute;left:4.5px;top:1.5px;width:3.5px;height:7px;border:solid #fff;border-width:0 1.5px 1.5px 0;transform:rotate(45deg)}
.v2-st p{margin:0;display:flex;gap:10px;font-size:13px;white-space:nowrap}
.v2-st p b{font-weight:600;color:var(--blue)}
.v2-st p span{color:var(--ink-2)}
.v2-st em{margin-left:auto;width:120px;height:4px;border-radius:4px;background:#e8effe;overflow:hidden}
.v2-st em s{display:block;height:100%;width:var(--pp,0%);border-radius:4px;background:linear-gradient(90deg,#6d9bff,#195ff9);transition:width .6s var(--ease)}

/* ---------- V3 layout optimisation ---------- */
.v3{background-color:#f3f5fa;background-image:linear-gradient(rgba(25,95,249,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(25,95,249,.05) 1px,transparent 1px);background-size:20px 20px;box-shadow:inset 0 0 0 1px #e6eaf2}
.v3-svg{position:absolute;inset:0;width:100%;height:100%}
.v3-sh polygon{fill:rgba(40,52,80,.13);transition:fill .5s}
.v3.p2 .v3-sh polygon{fill:rgba(245,165,36,.2)}
.v3-mods rect{fill:#34425f;stroke:#1f2a40;stroke-width:.5;opacity:0;transition:opacity .35s ease calc(var(--r) * 26ms),fill .5s ease calc(var(--g) * 45ms),stroke .5s ease calc(var(--g) * 45ms)}
.v3.p1 .v3-mods rect{opacity:1}
.v3.p2 .v3-mods rect.sh{fill:#f5a524;stroke:#c97a08}
.v3.p2b .v3-mods rect.sh{opacity:0}
.v3.p3 .v3-mods rect:not(.sh){fill:var(--sc);stroke:rgba(10,30,90,.55)}
.v3-strs polyline{fill:none;stroke:rgba(255,255,255,.8);stroke-width:1;stroke-dasharray:3 3;opacity:0;transition:opacity .6s ease .3s}
.v3.p3 .v3-strs polyline{opacity:1;animation:hwDash2 2.4s linear infinite}
@keyframes hwDash2{to{stroke-dashoffset:-24}}
.v3-lb text{font-family:var(--font);font-size:10.5px;fill:#5d6a82}
.v3-lb-sky rect{fill:#fff;stroke:#a9c2f7;stroke-width:1}
.v3-lb-sky text{fill:#1747b8}
.v3-lb-sh{opacity:0;transition:opacity .4s}
.v3.p2 .v3-lb-sh{opacity:1}
.v3-lb-sh rect{fill:#fff;stroke:#f5a524;stroke-width:1}
.v3-lb-sh text{fill:#a86200;font-size:11px}
.v3-side{position:absolute;left:408px;top:52px;width:146px;height:330px;display:flex;flex-direction:column;padding:16px 14px 14px;border-radius:12px;background:rgba(255,255,255,.9);border:1px solid #e3e8f2;box-shadow:0 20px 40px -30px rgba(20,40,110,.45)}
.v3-sh-t{margin:0;font-size:13px;font-weight:600;color:#14214a}
.v3-g{position:relative;margin:16px 0 0 14px;width:40px;height:156px;border-radius:10px;background:#eef2f9;box-shadow:inset 0 0 0 1px #e3e9f4}
.v3-gf{position:absolute;left:0;right:0;bottom:0;height:var(--v,0%);border-radius:10px;background:linear-gradient(180deg,#6d9bff,#195ff9);box-shadow:0 8px 18px -8px rgba(25,95,249,.8);transition:height .9s var(--ease)}
.v3-gt{position:absolute;left:-8px;width:56px;bottom:86%;height:0;border-top:1.5px dashed #f5a524}
.v3-gt span{position:absolute;left:60px;top:-9px;font-size:11px;font-weight:400;color:#a86200;white-space:nowrap}
.v3.p3 .v3-gt{border-top-style:solid}
.v3-it{list-style:none;margin:auto 0 0;padding:0;display:grid;gap:7px}
.v3-it li{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--soft);transition:color .3s}
.v3-it li i{width:8px;height:8px;border-radius:50%;background:#dfe5f0;transition:background .3s,box-shadow .3s}
.v3-it li.on{color:#14214a}
.v3-it li.on i{background:var(--blue);box-shadow:0 0 0 3px rgba(25,95,249,.16)}

/* ---------- V4 delivery package ---------- */
.v4{background:radial-gradient(70% 70% at 100% 0%,#c3d7ff 0%,rgba(195,215,255,0) 60%),radial-gradient(60% 80% at 0% 100%,#2f6ef4 0%,rgba(47,110,244,0) 65%),linear-gradient(160deg,#dde8ff 0%,#93b6fc 55%,#3f79f5 100%)}
.v4::before{content:"";position:absolute;right:-10%;top:10%;width:70%;height:80px;transform:rotate(28deg);background:linear-gradient(90deg,transparent,rgba(255,255,255,.4),transparent);filter:blur(22px);animation:hsG 16s ease-in-out infinite alternate;pointer-events:none}
.v4-bar{position:absolute;left:28px;right:28px;top:34px;height:56px;display:flex;align-items:center;gap:12px;padding:0 10px 0 12px;border-radius:14px;background:rgba(255,255,255,.82);border:1px solid rgba(255,255,255,.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 20px 40px -26px rgba(10,40,140,.55)}
.v4-ic{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,#6d9bff,#195ff9)}
.v4-ic svg{width:17px;height:17px;stroke:#fff}
.v4-bar p{margin:0;display:flex;flex-direction:column;line-height:1.35}
.v4-bar p b{font-size:14px;font-weight:600;color:#14214a}
.v4-bar p span{font-size:12px;color:var(--muted)}
.v4-dl{margin-left:auto;display:inline-flex;align-items:center;gap:6px;height:34px;padding:0 15px 0 12px;border-radius:var(--pill);background:var(--blue);color:#fff;font-size:13px;box-shadow:0 10px 20px -10px rgba(25,95,249,.9)}
.v4-dl svg{width:14px;height:14px;stroke:#fff}
.v4.fin .v4-dl{animation:hwGlow 2.4s ease-in-out infinite}
@keyframes hwGlow{50%{box-shadow:0 0 0 7px rgba(25,95,249,.18),0 10px 20px -10px rgba(25,95,249,.9)}}
.v4-cards{position:absolute;left:32px;right:32px;top:118px;display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.v4-c{background:#fff;border-radius:11px;overflow:hidden;box-shadow:0 26px 40px -24px rgba(10,30,100,.65),0 0 0 1px rgba(10,30,100,.05);opacity:0;transform:translateY(46px);transition:opacity .6s var(--ease),transform .9s var(--ease)}
.v4.play .v4-c{opacity:1;transform:translateY(var(--y,0px)) rotate(var(--rot,0deg))}
.v4-c:nth-child(1){--rot:-3deg;--y:8px}
.v4-c:nth-child(2){--rot:-1deg;transition-delay:.12s}
.v4-c:nth-child(3){--rot:1deg;transition-delay:.24s}
.v4-c:nth-child(4){--rot:3deg;--y:8px;transition-delay:.36s}
.v4-c:hover{z-index:2}
.v4-pv{height:108px;background:#f7f9fd;border-bottom:1px solid #eef1f6}
.v4-pv svg{display:block;width:100%;height:100%}
.v4-c p{margin:0;display:flex;flex-direction:column;align-items:flex-start;gap:6px;padding:9px 10px 11px}
.v4-c p span{max-width:100%;font-size:12px;color:#14214a;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.v4-zip{position:absolute;left:28px;right:28px;bottom:34px;height:54px;display:flex;align-items:center;gap:12px;padding:0 12px 0 10px;border-radius:14px;background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.45);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);color:#fff}
.v4-zi{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:rgba(255,255,255,.92);color:var(--blue);flex:none}
.v4-zi svg{width:17px;height:17px}
.v4-zip p{margin:0;font-family:var(--mono);font-size:12.5px;white-space:nowrap}
.v4-zip em{flex:1;height:4px;border-radius:4px;background:rgba(255,255,255,.3);overflow:hidden}
.v4-zip em s{display:block;height:100%;width:0;border-radius:4px;background:#fff;box-shadow:0 0 10px #fff;transition:width 1.3s var(--ease) .7s}
.v4.play .v4-zip em s{width:100%}
.v4-zip b{font-size:12px;font-weight:500;padding:4px 11px;border-radius:var(--pill);background:rgba(255,255,255,.92);color:#1747b8;white-space:nowrap}

/* =================== AUTO LONG CHAIN =================== */
body.page-how .hw-auto{padding:120px 0;background:var(--gray)}
.au-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.au-tag{display:inline-flex;align-items:center;gap:7px;padding:6px 14px 6px 11px;border-radius:var(--pill);font-size:13.5px}
.au-tag svg{width:15px;height:15px}
.au-tag-a{background:var(--blue);color:#fff;box-shadow:0 10px 20px -12px rgba(25,95,249,.85)}
.au-tag-b{background:#fff;color:var(--blue);border:1px solid var(--blue-3)}
.au-card{position:relative;padding:34px 40px 24px;border-radius:16px;background:#fff;border:1.5px dashed #b8cdfd;box-shadow:0 40px 80px -60px rgba(25,95,249,.6)}
.au-card::before{content:"";position:absolute;left:12%;right:12%;top:0;height:220px;background:radial-gradient(50% 100% at 50% 0%,rgba(25,95,249,.09),transparent 70%);pointer-events:none}
.au-lan{position:absolute;left:28px;top:-15px;margin:0;display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 13px 0 10px;border-radius:var(--pill);background:#fff;border:1.5px dashed #b8cdfd;font-size:12.5px;color:#1747b8}
.au-lan svg{width:14px;height:14px}
.au-chain{position:relative;padding-top:120px}
.au-arc{position:absolute;left:0;top:0;width:100%;height:116px;overflow:visible}
.au-arc-b{fill:none;stroke:#c3d4fb;stroke-width:1.5;stroke-dasharray:5 7}
.au-arc-f{fill:none;stroke:var(--blue);stroke-width:2.2;stroke-dasharray:1400;stroke-dashoffset:1400;opacity:0}
.au-card.rg .au-arc-f{opacity:1;animation:hwArc 1.1s var(--ease) forwards}
@keyframes hwArc{to{stroke-dashoffset:0}}
.au-arc-h{fill:none;stroke:#9fb9f5;stroke-width:1.6;transition:stroke .3s}
.au-card.rg .au-arc-h{stroke:var(--blue)}
.au-arc-l{position:absolute;left:50%;top:22px;transform:translateX(-50%);margin:0;display:inline-flex;align-items:center;gap:7px;height:34px;padding:0 16px 0 13px;border-radius:var(--pill);background:#fff;border:1px solid var(--blue-3);font-size:13.5px;color:#1747b8;white-space:nowrap;box-shadow:0 12px 26px -16px rgba(25,95,249,.7);transition:background .35s,color .35s,border-color .35s}
.au-arc-l svg{width:15px;height:15px}
.au-card.rg .au-arc-l{background:var(--blue);border-color:var(--blue);color:#fff}
.au-card.rg .au-arc-l svg{animation:spin 1.2s linear infinite}
.au-arc-dot{position:absolute;left:0;top:0;width:12px;height:12px;margin:-6px 0 0 -6px;border-radius:50%;background:#fff;border:3px solid var(--blue);box-shadow:0 0 0 5px rgba(25,95,249,.16),0 0 16px rgba(25,95,249,.8);opacity:0;pointer-events:none;z-index:2}
.au-row{display:flex;align-items:flex-start}
.au-n{position:relative;z-index:1;flex:0 0 164px;padding:7px 7px 14px;border-radius:12px;background:#fff;border:1px solid #e3e7ef;transition:border-color .35s,box-shadow .35s,transform .4s var(--ease)}
.au-v{position:relative;height:80px;border-radius:8px;background:#f4f7fe;overflow:hidden}
.au-v-d{background:#0f1b3d}
.au-v svg{display:block;width:100%;height:100%}
.au-v::after{content:"";position:absolute;top:0;bottom:0;left:-40%;width:40%;background:linear-gradient(90deg,transparent,rgba(25,95,249,.16),transparent);opacity:0}
.au-v-d::after{background:linear-gradient(90deg,transparent,rgba(160,190,255,.22),transparent)}
.au-n.act .au-v::after{opacity:1;animation:hwScan 1s linear infinite}
.au-t{margin:12px 6px 0;font-size:15px;font-weight:600;letter-spacing:-.01em;color:#14214a;white-space:nowrap}
.au-s{margin:3px 6px 0;font-size:12.5px;color:var(--muted);white-space:nowrap}
.au-ver{position:absolute;right:6px;top:6px;font-family:var(--mono);font-size:10.5px;line-height:1.5;padding:1px 7px;border-radius:var(--pill);background:#fff;border:1px solid var(--line-2);color:var(--muted);transition:background .3s,border-color .3s,color .3s}
.au-ver.up{background:var(--blue);border-color:var(--blue);color:#fff;animation:hwPop .5s var(--ease)}
@keyframes hwPop{0%{transform:scale(.6)}60%{transform:scale(1.15)}100%{transform:none}}
.au-chg{transition:stroke .4s}
.au-card.chg .au-chg{stroke:var(--blue)}
.au-cur{animation:hwCaret 1s steps(1) infinite}
.au-led circle{animation:hwLed 1.6s steps(2) infinite}
.au-led circle:nth-child(2n){animation-delay:-.8s}
@keyframes hwLed{50%{opacity:.35}}
.au-l{position:relative;flex:1;height:2px;margin-top:46px;background:#e1e7f4;transition:background .3s}
.au-l.fill{background:linear-gradient(90deg,#9cbcff,#195ff9)}
.au-l i{position:absolute;left:0;top:-3px;width:8px;height:8px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 4px rgba(25,95,249,.16),0 0 10px rgba(25,95,249,.8);opacity:0}
.au-l.go i{animation:hwAuL .34s linear forwards}
@keyframes hwAuL{0%{left:0;opacity:1}90%{opacity:1}100%{left:calc(100% - 8px);opacity:0}}
.au-n.act{border-color:var(--blue);box-shadow:0 0 0 4px rgba(25,95,249,.1),0 22px 36px -22px rgba(25,95,249,.85);transform:translateY(-5px)}
.au-n::after{content:"";position:absolute;right:-7px;top:-7px;width:22px;height:22px;border-radius:50%;border:2px solid #fff;background:var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.2l2.3 2.3 4.7-4.8' fill='none' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/15px no-repeat;box-shadow:0 4px 10px -4px rgba(25,95,249,.8);transform:scale(0);transition:transform .35s var(--ease)}
.au-n.done::after{transform:scale(1)}
.au-foot{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:26px;padding-top:18px;border-top:1px solid var(--line)}
.au-st{margin:0;display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--ink-2)}
.au-st i{width:16px;height:16px;border-radius:50%;border:2px solid var(--blue);border-right-color:transparent;animation:spin .9s linear infinite;flex:none}
.au-vs{margin:0;display:flex;gap:8px}
.au-vs span{font-size:12.5px;color:var(--muted);border:1px solid var(--line);border-radius:var(--pill);padding:3px 11px;background:#fff}
.au-vs b{margin-left:5px;font-family:var(--mono);font-weight:500;color:#14214a;transition:color .3s}
.au-vs b.up{color:var(--blue)}

/* =================== 24H NIGHT =================== */
body.page-how .hw-night{padding:128px 0 110px;background:#fff}
.nt{position:relative;height:500px;border-radius:18px;overflow:hidden;isolation:isolate;box-shadow:0 50px 90px -60px rgba(14,26,82,.7);
  background:
    radial-gradient(20% 42% at 27.3% 104%,rgba(255,176,146,.42),rgba(255,176,146,0) 70%),
    radial-gradient(16% 36% at 73% 104%,rgba(255,202,168,.36),rgba(255,202,168,0) 70%),
    linear-gradient(90deg,#eef4ff 0%,#e5eeff 15%,#cddbfb 22.5%,#9fb3ee 27.3%,#5a70cc 31%,#27388a 36%,#111e5a 44%,#0c1850 52%,#0f1d5a 61%,#20378d 67.5%,#5578d8 72.7%,#a7c0f5 77%,#dce8ff 82%,#eef4ff 90%,#f3f7ff 100%)}
.nt::after{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;background:linear-gradient(180deg,rgba(255,255,255,.08),transparent 40%)}
.nt-sky{position:absolute;inset:0;pointer-events:none}
.nt-sun{position:absolute;left:calc(60px + (100% - 120px) * .085);top:74px;width:56px;height:56px;margin-left:-28px;border-radius:50%;background:radial-gradient(circle at 42% 40%,#fff 0%,#fff7da 40%,#ffd98c 100%);box-shadow:0 0 0 12px rgba(255,220,140,.2),0 0 70px 24px rgba(255,214,130,.38)}
.nt-moon{position:absolute;left:calc(60px + (100% - 120px) * .5);top:58px;width:46px;height:46px;margin-left:-23px;border-radius:50%;box-shadow:inset -13px -3px 0 0 #eef2ff;filter:drop-shadow(0 0 14px rgba(200,215,255,.75));transform:rotate(-18deg)}
.nt-stars{position:absolute;inset:0}
.nt-stars i{position:absolute;width:2px;height:2px;border-radius:50%;background:#fff;opacity:.85;animation:hwTw 3.2s ease-in-out infinite}
.nt-stars i.b{width:3px;height:3px;box-shadow:0 0 6px rgba(255,255,255,.9)}
@keyframes hwTw{50%{opacity:.25}}
.nt-mid{position:absolute;left:50%;top:176px;transform:translateX(-50%);margin:0;font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:rgba(220,230,255,.72);white-space:nowrap}
.nt-area{position:absolute;left:60px;right:60px;top:0;bottom:0}
.nt-mark{position:absolute;left:calc(var(--x) * 100%);top:160px;bottom:40px;border-left:1.5px dashed rgba(25,95,249,.5)}
.nt-mark-in{border-left-color:rgba(160,185,255,.6)}
.nt-card{position:absolute;left:calc(var(--x) * 100%);top:30px;width:230px;transform:translateX(-50%);padding:14px 16px 16px;border-radius:14px;background:rgba(255,255,255,.84);border:1px solid rgba(255,255,255,.95);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 24px 50px -30px rgba(10,20,70,.65);transition:box-shadow .5s,border-color .5s,background .5s}
.nt-card.on{background:#fff;border-color:var(--blue-3);box-shadow:0 0 0 5px rgba(25,95,249,.1),0 24px 50px -26px rgba(25,95,249,.75)}
.nt-ck{margin:0;font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--blue)}
.nt-card h4{margin:3px 0 0;font-size:18px;font-weight:600;letter-spacing:-.01em;color:#14214a}
.nt-q{list-style:none;margin:12px 0 0;padding:0;display:grid;gap:6px}
.nt-q li{display:flex;align-items:center;gap:8px}
.nt-q i{width:8px;height:8px;border-radius:50%;background:var(--c);flex:none}
.nt-q s{position:relative;flex:1;height:6px;border-radius:6px;background:#e7ecf6;overflow:hidden}
.nt-q li:nth-child(2) s{flex:.72}.nt-q li:nth-child(3) s{flex:.86}.nt-q li:nth-child(4) s{flex:.64}.nt-q li:nth-child(5) s{flex:.78}
.nt-q s::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#9cbcff,#195ff9);transform:scaleX(0);transform-origin:left;transition:transform .5s var(--ease)}
.nt-in.on .nt-q s::after{transform:scaleX(1)}
.nt-in.on .nt-q li:nth-child(2) s::after{transition-delay:.06s}.nt-in.on .nt-q li:nth-child(3) s::after{transition-delay:.12s}.nt-in.on .nt-q li:nth-child(4) s::after{transition-delay:.18s}.nt-in.on .nt-q li:nth-child(5) s::after{transition-delay:.24s}
.nt-out{width:252px}
.nt-files{display:flex;flex-wrap:wrap;gap:5px;margin-top:11px}
.nt-files span{font-family:var(--mono);font-size:11px;padding:3px 7px;border-radius:5px;background:var(--blue-soft);color:#1747b8;opacity:.28;transform:translateY(4px);transition:opacity .4s,transform .4s var(--ease)}
.nt-out.on .nt-files span{opacity:1;transform:none}
.nt-out.on .nt-files span:nth-child(2){transition-delay:.07s}.nt-out.on .nt-files span:nth-child(3){transition-delay:.14s}.nt-out.on .nt-files span:nth-child(4){transition-delay:.21s}.nt-out.on .nt-files span:nth-child(5){transition-delay:.28s}
.nt-rows{position:absolute;left:0;right:0;top:218px;display:grid;gap:12px}
.nt-row{position:relative;height:34px}
.nt-bar{position:absolute;top:0;height:34px;display:flex;align-items:center;padding:0 12px;overflow:hidden;border-radius:10px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.22);box-shadow:inset 0 1px 0 rgba(255,255,255,.06)}
.nt-bar i{position:absolute;left:0;top:0;bottom:0;width:calc(var(--f,0) * 100%);background:linear-gradient(90deg,rgba(79,134,255,.5),rgba(109,155,255,.92));box-shadow:0 0 18px rgba(109,155,255,.55)}
.nt-bar.run i::after{content:"";position:absolute;right:0;top:0;bottom:0;width:2px;background:#fff;box-shadow:0 0 8px #fff}
.nt-bar b{position:relative;display:flex;align-items:center;gap:7px;font-size:12.5px;font-weight:500;color:#fff;white-space:nowrap}
.nt-bar b::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--c);box-shadow:0 0 8px var(--c)}
.nt-bar::after{content:"";position:absolute;right:8px;top:50%;width:18px;height:18px;margin-top:-9px;border-radius:50%;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4.5 8.2l2.3 2.3 4.7-4.8' fill='none' stroke='%23195ff9' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/13px no-repeat;transform:scale(0);transition:transform .35s var(--ease)}
.nt-bar.done::after{transform:scale(1)}
.nt-axis{position:absolute;left:0;right:0;bottom:40px;height:0}
.nt-axis::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,rgba(20,33,74,.28) 0%,rgba(20,33,74,.28) 20%,rgba(255,255,255,.4) 32%,rgba(255,255,255,.4) 66%,rgba(20,33,74,.28) 78%,rgba(20,33,74,.28) 100%)}
.nt-axis span{position:absolute;left:calc(var(--x) * 100%);top:10px;transform:translateX(-50%);font-family:var(--mono);font-size:12px;color:#3d4a66;white-space:nowrap}
.nt-axis span::before{content:"";position:absolute;left:50%;top:-10px;width:1px;height:6px;background:currentColor;opacity:.55}
.nt-axis span.dk{color:rgba(220,230,255,.78)}
.nt-axis em{position:absolute;left:100%;top:0;margin-left:6px;font-style:normal;font-size:10.5px;padding:0 6px;border-radius:var(--pill);background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);color:#fff}
.nt-cur{position:absolute;left:calc(var(--x,.2083) * 100%);top:22px;bottom:40px;width:0;z-index:3;pointer-events:none}
.nt-cur i{position:absolute;left:-1px;top:0;bottom:0;width:2px;border-radius:2px;background:linear-gradient(180deg,rgba(109,155,255,0),#6d9bff 22%,#195ff9);box-shadow:0 0 12px rgba(160,190,255,.95)}
.nt-cur b{position:absolute;left:0;bottom:-12px;transform:translateX(-50%);font-family:var(--mono);font-size:12px;font-weight:500;color:#fff;background:var(--blue);border-radius:var(--pill);padding:3px 10px;box-shadow:0 0 0 3px rgba(255,255,255,.7),0 8px 16px -6px rgba(25,95,249,.8);white-space:nowrap}

/* =================== STAIRS =================== */
body.page-how .hw-start{position:relative;overflow:hidden;padding:120px 0 100px;background:linear-gradient(180deg,#fff 0%,#f6f9ff 100%)}
.hw-start::before{content:"";position:absolute;right:-12%;bottom:-40%;width:74%;height:100%;background:radial-gradient(closest-side,rgba(25,95,249,.13),transparent);pointer-events:none}
.hw-start .wrap{position:relative}
.st{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;align-items:end;min-height:470px;position:relative}
.st::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:linear-gradient(90deg,#dfe7f8,#b8cdfd)}
.st li{display:flex;flex-direction:column;justify-content:flex-end}
.st-t{padding:0 10px 20px 4px;opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease) calc(var(--i) * .16s + .4s),transform .7s var(--ease) calc(var(--i) * .16s + .4s)}
.st-t h3{margin:0;font-size:26px;font-weight:600;letter-spacing:-.015em;color:#14214a}
.st-t p{margin:8px 0 0;max-width:310px;font-size:15px;line-height:1.7;color:var(--muted)}
.st-b{position:relative;height:var(--h);border-radius:16px 16px 4px 4px;overflow:hidden;transform-origin:bottom;transform:scaleY(.001);transition:transform 1s var(--ease) calc(var(--i) * .16s)}
.st.in .st-b{transform:none}
.st.in .st-t{opacity:1;transform:none}
.st{min-height:610px}
.st-b{box-shadow:0 34px 60px -38px rgba(14,40,120,.7);background:#0e1a3a}
.st-b img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transform:scale(1.08);transition:transform 1.4s var(--ease)}
.st li:hover .st-b img{transform:scale(1.14)}
.st.in .st-b img{transform:scale(1)}
.st-b::before{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;background:linear-gradient(180deg,rgba(25,95,249,.08) 0%,rgba(20,55,170,.35) 45%,rgba(9,24,78,.88) 100%)}
.st li:nth-child(1) .st-b::before{background:linear-gradient(180deg,rgba(255,255,255,0) 30%,rgba(120,160,250,.4) 65%,rgba(25,95,249,.85) 100%)}
.st li:nth-child(4) .st-b::before{background:linear-gradient(180deg,rgba(25,95,249,.2) 0%,rgba(25,95,249,.55) 55%,rgba(16,70,220,.95) 100%)}
.st li:nth-child(4) .st-b{box-shadow:0 40px 70px -30px rgba(25,95,249,.85)}
.st li:nth-child(4) .st-b::after{content:"";position:absolute;left:-30%;top:0;bottom:0;width:30%;z-index:2;background:linear-gradient(90deg,transparent,rgba(255,255,255,.22),transparent);animation:hwShine 4s ease-in-out 1.6s infinite}
@keyframes hwShine{0%{left:-30%}40%,100%{left:110%}}
.st-n{position:absolute;left:22px;bottom:14px;z-index:3;font-family:"Instrument Sans",var(--font);font-size:72px;font-weight:600;line-height:1;letter-spacing:-.04em;color:rgba(255,255,255,.9);text-shadow:0 10px 30px rgba(0,20,80,.35)}
.st-ui{position:absolute;left:14px;right:14px;top:14px;z-index:3;padding:12px 14px;border-radius:12px;background:rgba(255,255,255,.78);backdrop-filter:blur(14px) saturate(1.4);-webkit-backdrop-filter:blur(14px) saturate(1.4);border:1px solid rgba(255,255,255,.8);box-shadow:0 18px 34px -22px rgba(10,30,90,.6);opacity:0;transform:translateY(10px);transition:opacity .6s var(--ease) calc(var(--i) * .16s + .7s),transform .6s var(--ease) calc(var(--i) * .16s + .7s)}
.st.in .st-ui{opacity:1;transform:none}
.st-uh{margin:0 0 8px;display:flex;align-items:center;justify-content:space-between;font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--blue)}
.st-uh b{font-weight:500;color:#14214a}
.st-row{margin:4px 0 0;display:flex;align-items:center;gap:8px;font-size:12.5px;color:#4b5570;padding:5px 8px;border-radius:7px}
.st-row i{width:6px;height:6px;border-radius:50%;background:#c6d3ee;flex:none}
.st-row.on{background:#fff;color:#14214a;box-shadow:inset 0 0 0 1px var(--blue-3)}
.st-row.on i{background:var(--blue);box-shadow:0 0 0 3px rgba(25,95,249,.16)}
.st-cn{margin:0;display:flex;flex-wrap:wrap;gap:5px}
.st-cn span{font-size:11.5px;padding:3px 8px;border-radius:var(--pill);background:#fff;border:1px solid var(--line);color:#14214a}
.st-fl{margin:8px 0 0;display:flex;align-items:center;gap:7px;font-size:12px;color:#4b5570;font-family:var(--mono)}
.st-task{margin:0 0 8px;font-size:13px;font-weight:600;color:#14214a}
.st-bar{margin:0;height:5px;border-radius:5px;background:#dfe7f8;overflow:hidden}
.st-bar s{display:block;height:100%;width:40%;border-radius:5px;background:linear-gradient(90deg,#6594fb,#195ff9);animation:stBar 3.2s var(--ease) infinite}
@keyframes stBar{0%{transform:translateX(-100%)}100%{transform:translateX(250%)}}
.st-live{display:inline-flex;align-items:center;gap:5px;color:var(--blue)!important}
.st-live i{width:6px;height:6px;border-radius:50%;background:#2fbf71;box-shadow:0 0 0 3px rgba(47,191,113,.2);animation:hwLed 1.4s infinite}
.st-tg{margin:5px 0 0;display:flex;align-items:center;justify-content:space-between;font-size:12.5px;color:#14214a}
.st-tg i{position:relative;width:26px;height:15px;border-radius:15px;background:#cfd8ea;flex:none}
.st-tg i::after{content:"";position:absolute;left:2px;top:2px;width:11px;height:11px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.st-tg.on i{background:var(--blue)}
.st-tg.on i::after{left:13px}

/* ---- PV cover ---- */
.pvc{position:relative;height:420px;margin:-8px 0 96px;border-radius:22px;overflow:hidden;isolation:isolate;background:#0e1a3a;box-shadow:0 50px 90px -60px rgba(14,40,120,.75)}
.pvc-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 60%;transform:scale(1.06);transition:transform 1.8s var(--ease)}
.pvc.in .pvc-img{transform:none}
.pvc-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,26,86,.92) 0%,rgba(18,62,190,.66) 38%,rgba(25,95,249,.12) 70%,rgba(255,255,255,.12) 100%)}
.pvc-l{position:absolute;left:56px;top:52px;bottom:52px;display:flex;flex-direction:column;justify-content:space-between;color:#fff}
.pvc-k{margin:0;display:inline-flex;align-items:center;gap:8px;align-self:flex-start;height:32px;padding:0 14px 0 12px;border-radius:var(--pill);background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font-size:13px}
.pvc-k i{width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,#ffe08a,#f5a524)}
.pvc-nums{display:flex;gap:48px}
.pvc-nums p{margin:0;display:flex;flex-direction:column}
.pvc-nums b{font-family:"Instrument Sans",var(--font);font-size:96px;font-weight:500;line-height:.9;letter-spacing:-.05em}
.pvc-nums span{margin-top:10px;font-size:15px;color:rgba(255,255,255,.78)}
.pvc-io{position:absolute;right:36px;top:36px;bottom:36px;width:620px;display:grid;grid-template-columns:1fr 132px 1fr;align-items:center;gap:0;padding:22px;border-radius:18px;background:rgba(255,255,255,.72);border:1px solid rgba(255,255,255,.85);backdrop-filter:blur(18px) saturate(1.4);-webkit-backdrop-filter:blur(18px) saturate(1.4);box-shadow:0 30px 60px -36px rgba(8,26,86,.8)}
.pvc-col{display:flex;flex-direction:column;gap:8px}
.pvc-h{margin:0 0 4px;font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--blue)}
.pvc-f{margin:0;display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:10px;background:#fff;border:1px solid #e6ecf7;font-size:13px;color:#14214a;white-space:nowrap;box-shadow:0 8px 16px -14px rgba(14,40,120,.6)}
.pvc-mid{position:relative;display:flex;flex-direction:column;align-items:center;gap:10px;height:100%;justify-content:center}
.pvc-mid::before{content:"";position:absolute;left:50%;top:14%;bottom:14%;width:1px;background:linear-gradient(180deg,transparent,var(--blue-3),transparent)}
.pvc-mid::after{content:"";position:absolute;left:50%;top:14%;width:7px;height:7px;margin-left:-3px;border-radius:50%;background:var(--blue);box-shadow:0 0 10px rgba(25,95,249,.9);animation:pvcDot 2.8s linear infinite}
@keyframes pvcDot{to{transform:translateY(240px);opacity:.2}}
.pvc-mid span{position:relative;z-index:1;display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:500;padding:6px 12px 6px 7px;border-radius:var(--pill);background:#fff;border:1px solid var(--blue-3);color:#14214a;white-space:nowrap;box-shadow:0 10px 18px -12px rgba(25,95,249,.8)}
.pvc-mid span i{width:14px;height:14px;border-radius:4px;background:linear-gradient(135deg,var(--c1),var(--c2))}
.pvc-t{margin:22px 0 0;font-size:40px;font-weight:600;letter-spacing:-.02em;line-height:1.15}
.pvc-s{margin:10px 0 0;font-size:15px;color:rgba(255,255,255,.75)}

/* ---- MIL / SIL / HIL ---- */
.xil{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:24px}
.xil-c{position:relative;height:300px;border-radius:18px;overflow:hidden;isolation:isolate;background:#0e1a3a;box-shadow:0 40px 70px -50px rgba(14,40,120,.8)}
.xil-c img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease)}
.xil-c:hover img{transform:scale(1.06)}
.xil-c::before{content:"";position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,rgba(9,24,78,.15) 0%,rgba(14,46,150,.55) 50%,rgba(8,22,70,.94) 100%)}
.xil-t{position:absolute;inset:0;z-index:2;padding:26px 28px;display:flex;flex-direction:column;justify-content:flex-end;color:#fff}
.xil-t b{position:absolute;left:24px;top:14px;font-family:"Instrument Sans",var(--font);font-size:96px;font-weight:600;letter-spacing:-.05em;line-height:1;color:rgba(255,255,255,.92);text-shadow:0 12px 30px rgba(0,20,80,.4)}
.xil-sw{margin:0 0 6px;font-size:20px;font-weight:600;letter-spacing:-.01em}
.xil-t p{margin:0;font-size:14.5px;line-height:1.6;color:rgba(255,255,255,.8)}
.xil-t .xil-sw{color:#fff}
.xil-f{position:absolute;right:22px;top:24px;font-family:var(--mono);font-size:12px;padding:5px 11px;border-radius:var(--pill);background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.35);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}

/* ---- night task cards ---- */
.ntc{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:28px}
.ntc-c{padding:10px 10px 18px;border-radius:18px;background:#fff;border:1px solid var(--line);box-shadow:0 30px 60px -48px rgba(14,40,120,.7);transition:transform .45s var(--ease),box-shadow .45s var(--ease)}
.ntc-c:hover{transform:translateY(-6px);box-shadow:0 40px 70px -40px rgba(25,95,249,.55)}
.ntc-p{position:relative;height:190px;border-radius:12px;overflow:hidden;background:#0e1a3a}
.ntc-p img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease)}
.ntc-c:hover .ntc-p img{transform:scale(1.07)}
.ntc-p::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(9,24,78,0) 45%,rgba(9,24,78,.55))}
.ntc-app{position:absolute;left:10px;bottom:10px;z-index:1;display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 10px 0 8px;border-radius:var(--pill);background:rgba(255,255,255,.88);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);font-size:12px;color:#14214a}
.ntc-app i{width:8px;height:8px;border-radius:50%;background:var(--c)}
.ntc-c h4{margin:16px 8px 4px;font-size:17px;font-weight:600;color:#14214a}
.ntc-sw{margin:0 8px;font-size:13px;color:var(--muted)}
.ntc-o{margin:14px 8px 0;display:flex;align-items:center;gap:8px;padding-top:12px;border-top:1px dashed var(--line-2);font-family:var(--mono);font-size:12.5px;color:#14214a}
.page-how .ft-nc{--tc:#2f2e2c}.page-how .ft-stl{--tc:#0f9d8a}

/* =================== fallbacks =================== */
.no-js .hw-txt{opacity:1;transform:none}
.no-js .hw-viz{opacity:1;filter:none;transform:none}
.no-js .st-b,.no-js .st-t{opacity:1;transform:none}
.no-js .v1-file,.no-js .v1-plan,.no-js .v1-plan li,.no-js .v4-c{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .hw-hs,.v2::before,.v4::before,.nt-stars i,.st li:nth-child(4) .st-b::after,.st-bar s,.pvc-mid::after{animation:none!important}
  .hw-txt{opacity:1;transform:none}
  .hw-viz{opacity:1;filter:none;transform:none}
}