/* Product system refresh · penny-s-study · additive, non-destructive layer */
:root{
  --ds-brand:#a78bfa;--ds-brand-2:#38bdf8;--ds-surface:#15142a;
  --ds-text:#f4f0ff;--ds-muted:#b6acd0;--ds-radius:20px;
  --ds-shadow:0 18px 48px rgba(15,23,42,.12);
  --ds-border:rgba(148,163,184,.22);
  --ds-focus:0 0 0 3px color-mix(in srgb,var(--ds-brand) 28%,transparent);
}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{font-family:Inter,"Segoe UI",system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit}
button,[role="button"],a{ -webkit-tap-highlight-color:transparent}
:where(button,input,select,textarea,a,[tabindex]):focus-visible{outline:0;box-shadow:var(--ds-focus);border-color:var(--ds-brand)!important}
:where(button){transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease,border-color .16s ease}
:where(button:not(:disabled)):active{transform:translateY(1px)}
:where(button:disabled){cursor:not-allowed;opacity:.55}
:where(input,select,textarea){border-radius:10px;transition:border-color .16s ease,box-shadow .16s ease}
:where(input,select,textarea):focus{outline:0;border-color:var(--ds-brand);box-shadow:var(--ds-focus)}
:where(table){border-collapse:separate;border-spacing:0;width:100%}
:where(th){font-weight:650}
:where(td,th){padding:10px 12px}
:where(.sidebar,.sb){
  border-right:1px solid var(--ds-border);
  box-shadow:8px 0 32px rgba(15,23,42,.05);
  scrollbar-width:thin;
}
:where(.brand-logo,.lg){background:linear-gradient(135deg,var(--ds-brand),var(--ds-brand-2));box-shadow:0 8px 24px color-mix(in srgb,var(--ds-brand) 25%,transparent)}
:where(.topbar,.tb){
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--ds-border);
}
:where(.nav-item,.nav button,.tabbar button,.fl button){
  border-radius:10px;transition:background .16s ease,color .16s ease,transform .16s ease;
}
:where(.nav-item.active,.nav button.active,.tabbar button.active,.fl button.on){
  background:color-mix(in srgb,var(--ds-brand) 13%,transparent);
  color:var(--ds-brand);font-weight:650;
}
:where(.card,.panel,.glass,.stat-card,.metric-card,.module-card,.experiment-card,.login-card){
  border-radius:var(--ds-radius);border:1px solid var(--ds-border);
  box-shadow:var(--ds-shadow);
}
:where(.card,.panel,.stat-card,.metric-card,.module-card,.experiment-card){transition:box-shadow .2s ease,border-color .2s ease,transform .2s ease}
@media(hover:hover){
  :where(.card,.panel,.stat-card,.metric-card,.module-card,.experiment-card):hover{border-color:color-mix(in srgb,var(--ds-brand) 38%,var(--ds-border));box-shadow:0 22px 52px rgba(15,23,42,.14)}
}
:where(.btn,.button,.bt,.primary-btn,.action-btn){border-radius:10px;font-weight:600}
:where(.btn-primary,.primary-btn,.action-primary){background:linear-gradient(135deg,var(--ds-brand),var(--ds-brand-2));border-color:transparent}
:where(.eyebrow){letter-spacing:.12em;font-weight:700}
:where(.empty-state,.empty,.no-data){border:1px dashed var(--ds-border);border-radius:var(--ds-radius);padding:24px}
img,svg,canvas{max-width:100%}
:where(.main,.mn,.view){min-width:0}
@media(max-width:760px){
  :where(.main,.mn){min-width:0;width:100%}
  :where(.topbar,.tb){position:sticky;top:0;z-index:20}
  :where(.card,.panel,.stat-card,.metric-card){border-radius:14px}
  :where(button,.btn,.bt){min-height:38px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}
@media print{
  :where(.sidebar,.sb,.topbar,.tb,.tabbar,button){display:none!important}
  body{background:#fff!important;color:#111!important}
  :where(.card,.panel,.stat-card,.metric-card){box-shadow:none!important;break-inside:avoid}
}


/* V2 application-specific visual layer */
body .app{max-width:760px;box-shadow:0 0 70px rgba(0,0,0,.28);border-left:1px solid rgba(167,139,250,.1);border-right:1px solid rgba(167,139,250,.1)}
body .navbar{background:rgba(13,17,39,.96);border-bottom-color:rgba(167,139,250,.18)}
body .view{padding:clamp(14px,3vw,24px) clamp(14px,3vw,22px) 108px}
body .card{border-color:rgba(167,139,250,.16);border-radius:18px;box-shadow:0 12px 32px rgba(0,0,0,.16)}
body .tabbar{border-top-color:rgba(167,139,250,.2);box-shadow:0 -10px 32px rgba(0,0,0,.2)}
body .tabbar button{min-height:58px}
body .btn-main{box-shadow:0 8px 20px rgba(79,123,255,.24)}


/* V3 · Astronomy learning workspace */
:root{
  --bg:#070d20;--bg2:#111b34;--bg3:#0c152b;
  --line:#263653;--text:#edf3ff;--sub:#a5b4d0;
  --blue:#66b7ff;--blue-d:#438fe2;
  --green:#54d6a0;--red:#ff777f;--purple:#b49afa;
  --amber:#ffca72;--cyan:#73e6e0;--pink:#ff98c8;
  --ds-brand:#75b8ff;--ds-brand-2:#b59af8;
  --ds-border:rgba(144,173,221,.2);
  --ds-radius:18px;
  --ds-shadow:0 16px 40px rgba(0,0,0,.2);
}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  min-height:100%;
  color:#edf3ff;
  background:
    radial-gradient(1000px 700px at 10% -10%,rgba(36,86,153,.28),transparent 62%),
    radial-gradient(900px 620px at 100% 100%,rgba(94,64,156,.2),transparent 58%),
    #070d20;
  font-family:Inter,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
#starsBg{opacity:.64}
.app{
  width:100%;
  max-width:1160px;
  min-height:100vh;
  margin:0 auto;
  background:linear-gradient(180deg,rgba(11,20,42,.96),rgba(8,15,33,.97));
  border-left:1px solid rgba(139,170,223,.1);
  border-right:1px solid rgba(139,170,223,.1);
  box-shadow:0 0 90px rgba(0,0,0,.28);
}
.navbar{
  min-height:66px;
  padding:12px clamp(18px,2.5vw,32px);
  background:rgba(9,17,37,.95);
  border-bottom:1px solid rgba(137,169,222,.16);
  box-shadow:0 5px 24px rgba(0,0,0,.14);
}
.navbar h1{
  font-size:16px;font-weight:780;letter-spacing:.3px;
  color:#f3f6ff;
}
.back-btn{color:#8ec8ff;border-radius:9px}
.back-btn:hover{background:rgba(102,183,255,.1)}
.study-intro{
  margin:18px clamp(18px,2.5vw,32px) 0;
  min-height:130px;
  padding:22px clamp(20px,2.7vw,34px);
  border-radius:19px;
  border:1px solid rgba(151,174,235,.22);
  background:
    radial-gradient(circle at 86% 10%,rgba(89,202,222,.16),transparent 25%),
    radial-gradient(circle at 65% 115%,rgba(146,111,222,.14),transparent 36%),
    linear-gradient(115deg,#18264a 0%,#19203e 55%,#202044 100%);
  box-shadow:0 13px 34px rgba(0,0,0,.18),inset 0 1px rgba(255,255,255,.04);
}
.study-intro .eyebrow{font-size:9px;letter-spacing:2px;color:#91caff}
.study-intro h2{font-size:clamp(21px,2vw,27px);font-weight:830;letter-spacing:-.5px;color:#f6f5ff;margin:6px 0}
.study-intro p{font-size:11.5px;line-height:1.75;color:#bdc8e2;max-width:760px}
.study-intro .study-tags{gap:7px;margin-top:12px}
.study-intro .study-tags span{
  padding:5px 10px;border-radius:99px;
  border:1px solid rgba(167,192,238,.22);
  background:rgba(178,203,241,.07);
  color:#d3e5ff;font-size:9.5px;
}
.study-intro .orbit{
  width:76px;height:76px;flex-basis:76px;
  color:#b4edff;font-size:31px;
  border:1px solid rgba(116,222,236,.34);
  background:radial-gradient(circle,rgba(78,187,212,.2),rgba(167,139,250,.08));
  box-shadow:0 0 34px rgba(67,171,212,.1),inset 0 0 20px rgba(167,139,250,.08);
}
.view{
  padding:22px clamp(18px,2.5vw,32px) 118px;
  max-width:100%;
}
.view>.brand{display:none}
.sec-title{
  margin:23px 0 12px;
  font-size:14px;font-weight:780;letter-spacing:.15px;color:#e6edff;
}
.card{
  background:linear-gradient(145deg,rgba(23,36,67,.94),rgba(15,25,49,.97));
  border:1px solid rgba(141,169,219,.18);
  border-radius:17px;
  padding:19px;
  box-shadow:0 12px 30px rgba(0,0,0,.14),inset 0 1px rgba(255,255,255,.025);
  margin-bottom:14px;
}
.title{font-size:23px;font-weight:830;letter-spacing:-.4px;color:#f1f5ff}
.sub{color:#aab8d2;font-size:12px;line-height:1.7}
.progress-overview{
  padding:19px 21px;
  border:1px solid rgba(104,172,255,.3);
  border-radius:17px;
  background:
    radial-gradient(circle at 90% 0,rgba(117,184,255,.14),transparent 32%),
    linear-gradient(115deg,rgba(43,79,143,.23),rgba(66,51,117,.22));
  box-shadow:0 12px 28px rgba(0,0,0,.13);
}
.po-circle{width:72px;height:72px}
.po-circle svg{width:72px;height:72px}
.po-info h4{color:#f0f5ff;font-size:14px}
.po-info p{color:#adbed8;font-size:11.5px}
.po-info p b{color:#e8f4ff}
.po-num{font-size:17px;color:#83c5ff}
.quick-grid{
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:12px;
}
.quick-card{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  min-height:142px;padding:19px 12px;
  background:linear-gradient(145deg,rgba(25,39,71,.96),rgba(15,26,52,.96));
  border:1px solid rgba(139,169,221,.19);
  border-radius:16px;
  box-shadow:0 8px 20px rgba(0,0,0,.1);
}
.quick-card:hover{
  transform:translateY(-3px);
  border-color:rgba(111,185,255,.4);
  box-shadow:0 14px 28px rgba(0,0,0,.18);
}
.quick-card .qi{font-size:28px;margin-bottom:11px;color:#9ed1ff}
.quick-card .qt{font-size:13px;color:#eef4ff;font-weight:760}
.quick-card .qs{font-size:10px;color:#9eafca;margin-top:5px}
.quick-card::after{opacity:.08}
.map-grid{
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:11px;
}
.map-card{
  min-height:112px;
  padding:15px;
  background:linear-gradient(145deg,rgba(22,35,65,.96),rgba(14,24,48,.98));
  border:1px solid rgba(139,169,221,.17);
  border-radius:15px;
  box-shadow:0 7px 18px rgba(0,0,0,.1);
}
.map-card:hover{
  transform:translateY(-2px);
  border-color:rgba(110,181,255,.37);
  box-shadow:0 12px 26px rgba(0,0,0,.16);
}
.map-ico{
  width:37px;height:37px;border-radius:11px;
  background:rgba(79,168,255,.13);
  border:1px solid rgba(101,174,255,.16);
  color:#b5d9ff;
}
.map-name{font-size:12.5px;color:#eef4ff}
.map-bar{height:6px;background:#202e4d;border-radius:99px;margin:10px 0 7px}
.map-info{font-size:10px;color:#a0b1cb}
.tag{font-size:10px;padding:3px 9px}
.btn{
  border-radius:11px;
  box-shadow:none;
  transition:transform .16s,box-shadow .16s,border-color .16s,background .16s;
}
.btn-main{
  background:linear-gradient(135deg,#327fe1,#5baeff);
  box-shadow:0 7px 18px rgba(56,132,224,.2);
}
.btn-main:hover{box-shadow:0 10px 24px rgba(56,132,224,.29);transform:translateY(-1px)}
.btn-ghost{border-color:rgba(110,174,255,.43);color:#9fceff;background:rgba(69,131,202,.07)}
.btn-ghost:hover{background:rgba(69,131,202,.14)}
.stem{
  font-size:17px;line-height:1.8;font-weight:600;
  color:#f0f5ff;margin:8px 0 18px;
}
.option{
  min-height:54px;
  padding:14px 16px;
  margin-bottom:10px;
  background:rgba(9,18,39,.66);
  border:1px solid rgba(135,164,213,.2);
  border-radius:13px;
}
.option:hover{border-color:rgba(107,178,255,.44);background:rgba(26,45,78,.68)}
.option.selected{border-color:#6ab8ff;background:rgba(69,145,225,.16)}
.option.right{border-color:#4dc58e;background:rgba(46,212,122,.12)}
.option.wrong{border-color:#e87880;background:rgba(255,91,91,.12)}
.opt-key{
  width:29px;height:29px;line-height:29px;
  color:#cfe5ff;background:#253657;
  border-radius:9px;font-size:12px;
}
.option.selected .opt-key{background:#6ab8ff;color:#10213a}
.option.right .opt-key{background:#54d6a0;color:#0e2c28}
.option.wrong .opt-key{background:#ff777f;color:#381e2c}
.opt-text{color:#d9e4f5;font-size:13.5px;line-height:1.65}
.fill-input{
  width:100%;min-height:46px;padding:11px 14px;
  border-radius:11px;background:#0b1731;
  border:1px solid rgba(135,164,213,.25);color:#eef5ff;
}
.explain{
  margin-top:16px;padding:17px;
  background:linear-gradient(145deg,rgba(28,47,78,.94),rgba(17,30,55,.96));
  border:1px solid rgba(106,184,255,.22);
  border-left:4px solid #69b5ff;
  border-radius:14px;
}
.explain .head{font-size:14px;color:#eff5ff}
.explain .line{font-size:12px;color:#bdcbe0;line-height:1.85}
.answer-card,.result-card,.exam-card{
  border:1px solid rgba(135,164,213,.2);
  border-radius:16px;
}
.reader-panel{
  max-width:1160px;
  left:50%;right:auto;width:min(100%,1160px);
  transform:translate(-50%,130%);
  background:rgba(12,19,42,.985);
  border:1px solid rgba(102,176,255,.28);
  border-bottom:0;
  border-radius:18px 18px 0 0;
  box-shadow:0 -14px 40px rgba(0,0,0,.34);
}
.reader-panel.show{transform:translate(-50%,0)}
.reader-text{color:#d6e2f5;background:rgba(5,12,29,.8);border:1px solid rgba(136,164,211,.13)}
.reader-title{color:#9fcfff}
.reader-row button{border-radius:10px}
.tabbar{
  max-width:1160px;
  padding:6px 10px calc(6px + env(safe-area-inset-bottom));
  background:rgba(12,20,43,.97);
  border-top:1px solid rgba(148,174,224,.17);
  box-shadow:0 -10px 34px rgba(0,0,0,.24);
}
.tabbar button{min-height:58px;color:#9aa9c8;font-size:10px}
.tabbar button.active{color:#9cd0ff}
.tabbar button.active::before{
  width:38px;height:3px;
  background:linear-gradient(90deg,#5aa8f5,#b59af8);
}
.version{color:#879ab9;font-size:10px;line-height:1.8}
.footer{color:#93a6c5}
@media(max-width:980px){
  .app{max-width:820px}
  .quick-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .map-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .tabbar,.reader-panel{max-width:820px}
}
@media(max-width:760px){
  .app{max-width:560px;border:0;box-shadow:none}
  .study-intro{margin:10px 10px 0;padding:15px}
  .study-intro .orbit{width:58px;height:58px;flex-basis:58px;font-size:24px}
  .view{padding:14px 13px 106px}
  .quick-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}
  .quick-card{min-height:116px;padding:14px 8px}
  .quick-card .qi{font-size:23px}
  .map-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
  .map-card{padding:12px;min-height:104px}
  .tabbar,.reader-panel{max-width:560px;width:100%;left:50%;transform:translate(-50%,130%)}
  .tabbar{transform:translate(-50%,0)}
  .reader-panel.show{transform:translate(-50%,0)}
}
@media(max-width:420px){
  .study-intro .orbit{display:none}
  .quick-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .map-grid{grid-template-columns:1fr 1fr}
  .po-row{align-items:flex-start}
  .po-info p{font-size:10.5px}
  .stem{font-size:15.5px}
  .option{min-height:50px;padding:12px}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}
@media print{
  #starsBg,.navbar,.study-intro,.tabbar,.reader-panel,button{display:none!important}
  .app,body,.view{max-width:none!important;background:#fff!important;color:#111!important;overflow:visible!important}
  .card,.map-card,.quick-card{box-shadow:none!important;break-inside:avoid}
}


/* V4 · Interaction, readability and responsive finishing pass */
:where(button,[role="button"],a,input,select,textarea){-webkit-tap-highlight-color:transparent}
:where(button,a,[role="button"]){transition:background-color .18s ease,border-color .18s ease,color .18s ease,box-shadow .18s ease,transform .18s ease}
:where(button:not(:disabled),[role="button"],a):active{transform:translateY(1px)}
:where(button:disabled){cursor:not-allowed;opacity:.58}
:where(input,select,textarea){max-width:100%;min-width:0}
:where(button,input,select,textarea,a,[tabindex]):focus-visible{outline:3px solid color-mix(in srgb,var(--ds-brand,#168b9a) 42%,transparent);outline-offset:2px}
:where(.card,.kpi,.gcard,.lib-cat,.param-group,.experiment-card,.metric-card,.module-card,.pnl,.score-card,.quick,.mode){transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
@media(hover:hover){:where(.card,.kpi,.gcard,.experiment-card,.metric-card,.module-card,.quick,.mode):hover{transform:translateY(-2px)}}
:where(table){max-width:100%;font-variant-numeric:tabular-nums}
:where(th){text-align:left}
:where(td,th){overflow-wrap:anywhere}
:where(img,svg,canvas){max-width:100%}
@media(max-width:760px){
  :where(.content,.pages,.content-body,.view,.mn){min-width:0;max-width:100%}
  :where(.hyhub-intro,.health-intro,.erp-intro,.study-intro,.labos-intro,.physchem-intro){gap:14px;padding:18px 16px}
  :where(.hyhub-intro .mark,.health-intro .health-state,.erp-intro .erp-mark,.study-intro .orbit,.labos-intro .labos-stamp,.physchem-intro .atom){flex-shrink:0}
  :where(.lib-stats,.metrics-grid){grid-template-columns:repeat(2,minmax(0,1fr))}
  :where(.lib-categories-grid){grid-template-columns:minmax(0,1fr)}
  :where(.lib-cat.open){grid-column:auto}
  :where(.lib-cat.open .lib-cat-body){grid-template-columns:minmax(0,1fr)}
  :where(table){display:block;max-width:100%;overflow-x:auto;white-space:nowrap}
}
@media(max-width:420px){
  :where(.hyhub-intro .mark,.erp-intro .erp-mark,.study-intro .orbit,.labos-intro .labos-stamp,.physchem-intro .atom){display:none}
  :where(.lib-stats,.metrics-grid){grid-template-columns:minmax(0,1fr)}
}
@media(prefers-reduced-motion:reduce){:where(button,a,[role="button"],.card,.kpi,.gcard,.experiment-card,.metric-card,.module-card,.quick,.mode){transition:none!important;transform:none!important}}


/* V5 · Core workspace actions */
.home-action-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:13px}.home-action-row .btn{min-height:35px;padding:8px 12px;font-size:10.5px}.progress-overview .po-row{align-items:center}.progress-overview .po-info{min-width:0;flex:1}.progress-overview .po-info p{line-height:1.8}@media(max-width:560px){.home-action-row{display:grid;grid-template-columns:1fr 1fr}.home-action-row .btn{width:100%;min-width:0;padding:8px 7px;font-size:10px}.home-action-row .btn:first-child{grid-column:1/-1}}


/* 2026-10-19 V6: high-visibility, domain-specific workflow layer */
.product-workflow{
  --workflow-accent:#a78bfa;
  position:relative;isolation:isolate;overflow:hidden;
  margin:18px clamp(16px,2.2vw,30px) 22px;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid color-mix(in srgb,var(--workflow-accent) 26%,#d7e2ed);
  border-radius:22px;
  background:
    radial-gradient(circle at 92% 0%,color-mix(in srgb,var(--workflow-accent) 16%,transparent),transparent 28%),
    linear-gradient(120deg,#fff 0%,#f7fbff 56%,color-mix(in srgb,var(--workflow-accent) 5%,#fff) 100%);
  box-shadow:0 18px 50px rgba(20,45,70,.075);
}
.product-workflow:before{content:"";position:absolute;z-index:-1;right:-42px;bottom:-92px;width:240px;height:240px;border:1px solid color-mix(in srgb,var(--workflow-accent) 17%,transparent);border-radius:50%;box-shadow:0 0 0 24px color-mix(in srgb,var(--workflow-accent) 3%,transparent),0 0 0 48px color-mix(in srgb,var(--workflow-accent) 2%,transparent)}
.product-workflow__head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:20px}
.product-workflow__head .eyebrow{display:block;margin-bottom:6px;color:var(--workflow-accent);font-size:10px;letter-spacing:.16em;font-weight:850}
.product-workflow__head h3{margin:0;color:#172e45;font-size:clamp(19px,2vw,25px);font-weight:820;letter-spacing:-.04em}
.product-workflow__head p{margin:6px 0 0;color:#63788e;font-size:12.5px;line-height:1.65}
.product-workflow__mode{flex:0 0 auto;padding:7px 10px;border:1px solid color-mix(in srgb,var(--workflow-accent) 25%,#dce7ef);border-radius:999px;background:#fff;color:#61788d;font-size:9px;font-weight:800;letter-spacing:.08em}
.product-workflow__grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.product-workflow__item{
  position:relative;display:flex;flex-direction:column;align-items:flex-start;gap:6px;
  min-width:0;min-height:132px;padding:15px 15px 13px;
  border:1px solid #e1eaf2;border-radius:15px;background:rgba(255,255,255,.94);
  color:#19334b;text-align:left;cursor:pointer;
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.product-workflow__item:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--workflow-accent) 48%,#dce7ef);box-shadow:0 13px 30px rgba(28,58,86,.1)}
.product-workflow__item i{font-style:normal;color:var(--workflow-accent);font-size:10px;font-weight:900;letter-spacing:.12em}
.product-workflow__item b{font-size:14px;font-weight:800}
.product-workflow__item small{color:#6b8094;font-size:11px;line-height:1.5}
.product-workflow__item span{margin-top:auto;color:var(--workflow-accent);font-size:10px;font-weight:800}
.product-workflow__foot{margin-top:14px;padding-top:11px;border-top:1px solid #e6edf3;color:#718397;font-size:10px;line-height:1.55}
@media(max-width:900px){.product-workflow__grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:560px){.product-workflow{margin:12px 12px 18px;padding:16px;border-radius:17px}.product-workflow__head{display:block}.product-workflow__mode{display:inline-flex;margin-top:11px}.product-workflow__grid{gap:8px}.product-workflow__item{min-height:122px;padding:12px}.product-workflow__item b{font-size:13px}}
@media(prefers-reduced-motion:reduce){.product-workflow__item{transition:none}.product-workflow__item:hover{transform:none}}


/* V4 · XingSaiTong astronomy learning cockpit */
.study-intro{
  position:relative;isolation:isolate;overflow:hidden;min-height:168px;
  padding:27px clamp(20px,3vw,38px);border-radius:21px;
  background:
    radial-gradient(circle at 82% 16%,rgba(93,196,235,.22),transparent 25%),
    radial-gradient(circle at 90% 105%,rgba(158,125,245,.2),transparent 34%),
    linear-gradient(116deg,#172a50 0%,#1c2850 53%,#28234d 100%);
  box-shadow:0 17px 42px rgba(0,0,0,.22),inset 0 1px rgba(255,255,255,.05);
}
.study-intro:after{
  content:"ORBITAL";position:absolute;z-index:-1;right:5%;top:18%;
  font-size:clamp(54px,8vw,104px);font-weight:900;letter-spacing:-5px;
  color:rgba(199,220,255,.055);line-height:1;
}
.study-intro h2{font-size:clamp(24px,2.8vw,34px);letter-spacing:-.8px}
.study-intro p{font-size:12px;max-width:800px;line-height:1.85}
.study-intro .study-tags span{padding:6px 11px;font-weight:700;background:rgba(185,210,255,.075)}
.study-intro .orbit{
  position:relative;width:94px;height:94px;flex-basis:94px;border-radius:50%;
  font-size:35px;color:#c5f3ff;border:1px solid rgba(143,220,255,.42);
  background:radial-gradient(circle at 38% 32%,rgba(109,219,255,.3),rgba(151,119,235,.12) 65%,transparent);
  box-shadow:0 0 0 12px rgba(119,172,255,.035),0 0 48px rgba(82,188,239,.2),inset 0 0 22px rgba(162,202,255,.12);
}
.product-workflow{
  margin:14px clamp(18px,2.5vw,32px) 4px;padding:20px 21px;
  border:1px solid rgba(144,174,229,.19);border-radius:18px;
  background:linear-gradient(145deg,rgba(22,36,68,.96),rgba(15,25,51,.98));
  box-shadow:0 12px 30px rgba(0,0,0,.16),inset 0 1px rgba(255,255,255,.025);
}
.product-workflow__head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:14px}
.product-workflow__head .eyebrow{font-size:9px;letter-spacing:1.8px;color:#91caff}
.product-workflow__head h3{font-size:16px;color:#eff5ff;margin:4px 0}
.product-workflow__head p{font-size:11px;color:#aabbd7;line-height:1.65}
.product-workflow__mode{white-space:nowrap;padding:6px 10px;border-radius:30px;background:rgba(108,174,239,.1);color:#a9d6ff;font-size:9px;font-weight:800}
.product-workflow__grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.product-workflow__item{
  min-height:112px;display:flex;flex-direction:column;align-items:flex-start;gap:7px;
  padding:13px;border:1px solid rgba(140,174,230,.17);border-radius:13px;
  background:linear-gradient(145deg,rgba(44,66,111,.36),rgba(22,36,69,.5));text-align:left;
  transition:transform .18s,border-color .18s,background .18s,box-shadow .18s;
}
.product-workflow__item:hover{transform:translateY(-3px);border-color:rgba(118,193,255,.48);background:rgba(56,89,143,.3);box-shadow:0 10px 24px rgba(0,0,0,.18)}
.product-workflow__item i{width:27px;height:27px;display:grid;place-items:center;border-radius:8px;background:rgba(105,185,246,.13);color:#9dd8ff;font-size:10px;font-style:normal;font-weight:850}
.product-workflow__item b{font-size:12px;color:#edf5ff}
.product-workflow__item small{font-size:10px;color:#a6b7d3}
.product-workflow__item span{margin-top:auto;color:#8fcaff;font-size:10px;font-weight:750}
.product-workflow__foot{margin-top:12px;padding-top:10px;border-top:1px solid rgba(147,177,225,.12);color:#879bbd;font-size:9.5px;line-height:1.6}
.view .card{
  border-color:rgba(142,174,226,.18);
  background:linear-gradient(145deg,rgba(24,39,73,.96),rgba(15,26,52,.98));
  box-shadow:0 12px 30px rgba(0,0,0,.16),inset 0 1px rgba(255,255,255,.025);
}
.view .sec-title{display:flex;align-items:center;gap:9px;color:#e9f1ff;font-size:14px;font-weight:800}
.view .sec-title:before{content:"";width:4px;height:15px;border-radius:4px;background:linear-gradient(#73c6ff,#ad9afa)}
.view .quick-card,.view .map-card{
  border:1px solid rgba(141,173,226,.19);
  background:linear-gradient(145deg,rgba(28,46,83,.96),rgba(16,28,55,.98));
  box-shadow:0 8px 22px rgba(0,0,0,.14);
}
.view .quick-card:hover,.view .map-card:hover{border-color:rgba(117,191,255,.45);transform:translateY(-2px)}
.view .option{border-color:rgba(151,178,225,.24);background:rgba(132,164,220,.07)}
.view .option:hover{border-color:#77bfff;background:rgba(104,169,239,.12)}
.view .explain{border-color:rgba(120,192,174,.22);background:rgba(71,160,135,.08)}
@media(max-width:760px){
 .study-intro{padding:21px 18px}
 .product-workflow__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
 .product-workflow__head{flex-direction:column}
}
@media(max-width:420px){
 .study-intro:after{font-size:46px;right:1%;top:12%}
 .study-intro .orbit{width:60px;height:60px;flex-basis:60px;font-size:24px}
 .product-workflow{padding:15px 12px}
 .product-workflow__grid{gap:7px}
 .product-workflow__item{min-height:118px;padding:10px}
 .product-workflow__item small{font-size:9px}
}