:root{color-scheme:only light}
:root{
  --bg:#E9F1F2; --ink:#0F1B24; --soft:#2E3F4A; --muted:#566B77; --rule:rgba(15,27,36,.14); --tint:rgba(15,27,36,.06);
  --link:#1638C4; --link-bg:rgba(22,56,196,.08);
  --g-polity:#4F7BFF; --g-ir:#E0457B; --g-economy:#EE9A12; --g-env:#1FA774; --g-scitech:#8E6BFF; --g-society:#0FA3B1; --g-bio:#E0457B; --g-earth:#1FA774;
  --polity:var(--g-polity); --ir:var(--g-ir); --economy:var(--g-economy); --env:var(--g-env); --scitech:var(--g-scitech); --society:var(--g-society);
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --sans:"Geist",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-padding-top:calc(64px + env(safe-area-inset-top,0px));background:var(--bg);transition:background-color .7s ease}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;transition:background-color .7s ease,color .7s ease}
button{font:inherit;color:inherit;cursor:pointer;background:none;border:0;padding:0}
a{color:inherit}
:focus-visible{outline:2px solid var(--link);outline-offset:3px;border-radius:2px}

/* top bar */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--bg);border-bottom:1px solid var(--rule);transition:background-color .7s ease}
.top-in{max-width:1120px;margin:0 auto;height:58px;padding:0 28px;display:flex;align-items:center;gap:20px}
.wordmark{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-size:22px;font-weight:500;letter-spacing:-.01em;white-space:nowrap}
.wordmark svg{flex:none}
.search{flex:1;max-width:340px;margin-left:auto;height:36px;border:1px solid var(--rule);border-radius:18px;background:var(--tint);padding:0 16px;font:inherit;font-size:14px;color:var(--ink)}
.search::placeholder{color:var(--muted)}
.search:focus{outline:none;border-color:var(--ink)}

main{min-height:70vh}
.wrap{max-width:1120px;margin:0 auto;padding:0 28px}

/* hero */
.hero{padding:64px 0 36px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:40px;align-items:center}
.hero h1{font-family:var(--serif);font-weight:400;font-size:clamp(40px,5.2vw,64px);line-height:.98;letter-spacing:-.03em;margin:0 0 22px}
.hero p{font-size:18px;line-height:1.55;color:var(--soft);margin:0;max-width:46ch}
.tunnel{width:100%;max-width:420px;justify-self:end;aspect-ratio:1}
.tunnel g{transform-origin:50% 50%;animation:sink 9s ease-in-out infinite alternate}
@keyframes sink{from{transform:scale(1)}to{transform:scale(1.07) translateY(1.5%)}}
.filters{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:44px}
.fbtn{font-size:14px;color:var(--soft);height:34px;padding:0 14px;border-radius:17px;border:1px solid var(--rule);display:inline-flex;align-items:center;gap:8px;background:transparent}
.fbtn:hover{border-color:var(--ink)}
.fbtn[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.dot{width:8px;height:8px;border-radius:50%;display:inline-block;flex:none}
.fspacer{flex:1}
.chk{font-size:14px;color:var(--soft);display:inline-flex;align-items:center;gap:7px;cursor:pointer;margin-left:6px}
.chk input{accent-color:var(--ink);margin:0}

/* strata */
.stratum{background:var(--bg);color:var(--ink);padding:44px 0 52px}
.stratum + .stratum{border-top:1px solid rgba(15,27,36,.16)}
.stratum-head{display:flex;align-items:baseline;gap:14px;margin-bottom:22px}
.year-n{font-family:var(--serif);font-size:64px;line-height:.9;letter-spacing:-.035em;font-weight:400}
.year-c{font-size:14px;color:var(--muted)}
.tiles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 44px}
.tile{display:grid;grid-template-columns:76px minmax(0,1fr);gap:18px;text-align:left;padding:22px 0;border-top:1px solid var(--rule);width:100%}
.tile .glyph{transition:transform .35s ease}
.tile:hover .glyph{transform:scale(1.08) rotate(-4deg)}
.tile:hover .t-title{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:5px}
.t-title{display:block;font-family:var(--serif);font-size:23px;line-height:1.18;letter-spacing:-.01em}
.t-hook{display:block;font-size:15px;line-height:1.45;color:var(--soft);margin-top:6px}
.t-meta{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:13px;color:var(--muted);margin-top:10px}
.t-meta span{display:inline-flex;align-items:center;gap:6px}
.t-meta .went{color:var(--link);font-weight:600}
.t-meta .ready{color:var(--ink);font-weight:600;background:#FFD66B;color:#0D1B29;padding:0 8px;border-radius:8px}
.t-meta .soon{font-style:italic}
.prob{font-style:italic}
.empty{padding:48px 0 80px;color:var(--muted);font-size:16px}
.bottom-note{font-size:13px;color:var(--muted);padding:36px 0 60px}

/* topic page */
.topic{padding:40px 0 100px}
.back{font-size:14px;color:var(--muted);margin-bottom:34px;display:inline-block}
.back:hover{color:var(--ink)}
.topic-head{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:40px;align-items:start;max-width:980px}
.kicker{font-size:14px;color:var(--muted);display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.title{font-family:var(--serif);font-weight:400;font-size:clamp(38px,5.6vw,64px);line-height:1.02;letter-spacing:-.025em;margin:0 0 20px}
.hookline{font-family:var(--serif);font-style:italic;font-size:24px;line-height:1.35;color:var(--soft);margin:0;max-width:34ch}
.topic-body{max-width:680px}
.lede{font-family:var(--serif);font-size:20px;line-height:1.62;margin-top:36px}
.lede p{margin:0 0 16px}
.note{font-size:15px;color:var(--soft);border-left:3px solid var(--rule);padding:2px 0 2px 16px;margin:24px 0}
.note b{font-weight:600;color:var(--ink)}
.calls{margin:40px 0}
.calls h2,.small-h{font-size:15px;font-weight:600;margin:0 0 12px}
.call{padding:16px 0;border-top:1px solid var(--rule)}
.call:last-child{border-bottom:1px solid var(--rule)}
.call q{quotes:none;font-family:var(--serif);font-size:21px;line-height:1.35;display:block}
.call p{margin:6px 0 0;font-size:14px;color:var(--muted)}
.verdict{font-size:13px;font-weight:600;margin-top:8px;display:inline-block;padding:2px 10px;border-radius:10px}
.verdict.failed{background:var(--g-bio);color:#fff} .verdict.held{background:var(--g-earth);color:#fff} .verdict.open{border:1px solid var(--rule);color:var(--muted)}
.descend{margin:52px 0;padding:34px 34px 30px;border-radius:18px;background:#0D1B29;color:#EEF3F4;position:relative;overflow:hidden}
.descend::after{content:"";position:absolute;right:-60px;bottom:-120px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,#182E40 0 30%,#2B4A5E 30% 45%,#476F82 45% 58%,transparent 58%);opacity:.7}
.descend h2{font-family:var(--serif);font-weight:400;font-size:30px;line-height:1.1;margin:0 0 10px;position:relative;z-index:1}
.descend p{margin:0 0 22px;font-size:15px;color:#C9D6DB;max-width:44ch;position:relative;z-index:1}
.descend .row{display:flex;align-items:center;gap:18px;flex-wrap:wrap;position:relative;z-index:1}
.primary{height:46px;padding:0 26px;border-radius:23px;background:#FFD66B;color:#0D1B29;font-size:15px;font-weight:600}
.primary:hover{background:#FFE08F}
.secondary{font-size:14px;color:#C9D6DB;text-decoration:underline;text-underline-offset:3px}
.foot{font-size:14px;color:var(--muted);max-width:680px}
.foot ul{list-style:none;padding:0;margin:8px 0 0}
.foot li{padding:7px 0;border-top:1px solid var(--rule)}
.foot a{color:var(--soft)}
.notice{font-size:14px;color:var(--soft);background:var(--tint);border-radius:10px;padding:14px 16px;margin:24px 0}

/* reader */
.reader{display:grid;grid-template-columns:230px minmax(0,700px);gap:60px;justify-content:center;padding:40px 28px 110px}
.rail{position:sticky;top:92px;align-self:start;font-size:13px;max-height:calc(100vh - 110px);overflow:auto;padding-bottom:20px}
.gauge{display:flex;gap:14px;align-items:stretch;margin-bottom:22px}
.gauge-bar{width:10px;border-radius:5px;overflow:hidden;display:flex;flex-direction:column;flex:none;box-shadow:0 0 0 1px var(--rule)}
.gauge-bar i{flex:1;display:block}
.gauge-bar i.on{box-shadow:inset 0 0 0 2px #FFD66B}
.gauge-txt b{display:block;font-family:var(--serif);font-weight:400;font-size:54px;line-height:.9;letter-spacing:-.03em}
.gauge-txt span{color:var(--muted);font-size:13px}
.path{list-style:none;margin:0;padding:0;position:relative}
.path li{position:relative;padding:0 0 14px 20px}
.path li::before{content:"";position:absolute;left:4px;top:12px;bottom:-4px;width:1px;background:var(--rule)}
.path li:last-child::before{display:none}
.path li::after{content:"";position:absolute;left:0;top:6px;width:9px;height:9px;border-radius:50%;border:1px solid var(--muted);background:var(--bg)}
.path li.cur::after{background:var(--link);border-color:var(--link)}
.path button{text-align:left;line-height:1.35;color:var(--soft)}
.path button:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}
.path li.cur button{color:var(--ink);font-weight:600}
.path .lv{display:block;color:var(--muted);font-size:12px}
.map-toggle{margin-top:10px;color:var(--muted);text-decoration:underline;text-underline-offset:3px}
.map{list-style:none;margin:12px 0 0;padding:0}
.map ul{list-style:none;margin:0;padding-left:12px;border-left:1px solid var(--rule)}
.map button{display:block;text-align:left;padding:3px 0;line-height:1.35;color:var(--soft)}
.map button:hover{color:var(--ink)}
.map button.cur{color:var(--link);font-weight:600}
.map button.unread{color:var(--muted);font-style:italic}
.map-reset{display:block;margin-top:16px;color:var(--muted);font-size:12px;text-decoration:underline;text-underline-offset:3px}
.m-crumbs,.m-map{display:none}
.from{font-size:14px;color:var(--muted);margin-bottom:18px;display:flex;align-items:center;gap:10px}
.from button{text-decoration:underline;text-underline-offset:3px;color:var(--soft)}
.node-head{display:flex;gap:20px;align-items:flex-start}
.node-head .glyph{flex:none;margin-top:6px}
.node-head .title{font-size:clamp(34px,4.8vw,54px)}
.why{font-size:16px;color:var(--soft);margin:-8px 0 26px;font-family:var(--serif);font-style:italic}
.why button{text-decoration:underline;text-underline-offset:3px;font-style:normal;font-family:var(--sans);font-size:15px}
.lenses{display:inline-flex;gap:4px;padding:4px;border-radius:22px;background:var(--tint);margin-bottom:30px;flex-wrap:wrap}
.lens{height:36px;padding:0 16px;border-radius:18px;font-size:14px;color:var(--soft);white-space:nowrap}
.lens:hover{color:var(--ink)}
.lens[aria-pressed="true"]{background:var(--ink);color:var(--bg)}
.page{font-family:var(--serif);font-size:19.5px;line-height:1.68;min-height:160px}
.page p{margin:0 0 18px}
.page h3{font-family:var(--sans);font-size:15px;font-weight:600;margin:36px 0 10px;line-height:1.3;color:var(--muted)}
.page ul,.page ol{margin:0 0 18px;padding-left:24px}
.page li{margin-bottom:8px}
.page strong{font-weight:600;color:var(--ink)}
.page p:first-child strong:first-child{display:block;font-family:var(--sans);font-size:13px;font-weight:600;color:var(--muted);margin-bottom:4px}
.page p:first-child{font-size:24px;line-height:1.4}
.page code{font-family:var(--sans);font-size:.85em;background:var(--tint);padding:1px 5px;border-radius:4px}
.wl{display:inline;font:inherit;color:var(--link);background:var(--link-bg);border-radius:4px;padding:0 3px;margin:0 -1px;text-decoration:none;box-shadow:inset 0 -2px 0 color-mix(in srgb,var(--link) 55%,transparent)}
.wl:hover{box-shadow:inset 0 -1.15em 0 color-mix(in srgb,var(--link) 22%,transparent)}
.wl-off{font:inherit;color:inherit}
.wl.seen{color:var(--muted);background:none;box-shadow:inset 0 -1px 0 var(--rule)}
.doors-h{margin-top:56px!important;color:var(--ink)!important;font-size:18px!important}
ul.doors{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
ul.doors li{font-family:var(--sans);font-size:14px;color:var(--soft);line-height:1.45;padding:16px 18px 18px;border-radius:14px;margin:0;background:var(--tint);border:1px solid var(--rule);transition:transform .2s ease,border-color .2s ease}
ul.doors li:hover{transform:translateY(3px);border-color:var(--link)}
ul.doors li .wl{display:block;font-family:var(--serif);font-size:22px;line-height:1.2;background:none;box-shadow:none;padding:0;margin:0 0 6px;text-align:left}
ul.doors li .wl::before{content:"";display:block;width:26px;height:4px;border-radius:2px;background:var(--link);margin-bottom:12px}
ul.doors li .wl.seen::before{background:var(--rule)}
.thinking{color:var(--muted);font-style:italic}
.thinking::after{content:"";display:inline-block;width:.6em;height:.6em;margin-left:8px;border-radius:50%;background:var(--link);animation:pulse 1s ease-in-out infinite alternate;vertical-align:middle}
@keyframes pulse{from{opacity:.25;transform:scale(.7)}to{opacity:1;transform:scale(1)}}
.status-line{font-size:14px;color:var(--muted);display:flex;gap:14px;align-items:center;margin:8px 0}
.status-line button{text-decoration:underline;text-underline-offset:3px}
.err{font-size:14px;color:var(--g-bio);margin:12px 0}
.err button{text-decoration:underline;text-underline-offset:3px;color:var(--ink)}
.ask{margin-top:56px;padding:18px 20px;border-radius:14px;border:1px solid var(--rule)}
.ask-l{font-size:13px;color:var(--muted);margin-bottom:6px}
.ask-row{display:flex;gap:12px;align-items:flex-end}
.ask textarea{flex:1;border:0;background:transparent;resize:none;font-family:var(--serif);font-size:19px;color:var(--ink);padding:4px 0;min-height:32px;field-sizing:content;max-height:160px}
.ask textarea:focus{outline:none}
.ask textarea::placeholder{color:var(--muted)}
.ask-go{height:36px;padding:0 18px;border-radius:18px;background:var(--ink);color:var(--bg);font-size:14px;font-weight:600}
.ask-go:disabled{opacity:.4;cursor:default}
.qa{margin-top:30px}
.qa-q{font-family:var(--serif);font-style:italic;font-size:20px;margin-bottom:8px;color:var(--soft)}
.qa .page{font-size:18px;min-height:0}
.qa .page p:first-child{font-size:18px}

/* learning path */
.lpath{margin:52px 0}
.lpath h2{font-family:var(--serif);font-weight:400;font-size:32px;letter-spacing:-.015em;margin:0 0 20px}
.lpath ol{list-style:none;margin:0;padding:0;position:relative}
.lp-step{display:grid;grid-template-columns:48px minmax(0,1fr);gap:18px;padding:0 0 30px;position:relative}
.lp-step::before{content:"";position:absolute;left:23px;top:48px;bottom:0;width:2px;background:var(--rule)}
.lp-step:last-child::before{display:none}
.lp-n{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;font-family:var(--serif);font-size:22px;background:var(--tint);border:1px solid var(--rule)}
.lp-step:nth-child(1) .lp-n{background:#C9DCE0}
.lp-step:nth-child(2) .lp-n{background:#6F97A6;color:#fff}
.lp-step:nth-child(3) .lp-n{background:#182E40;color:#FFD66B}
.lp-step.done .lp-n{box-shadow:0 0 0 3px var(--bg),0 0 0 5px var(--g-earth)}
.lp-b h3{font-size:18px;font-weight:600;margin:10px 0 4px}
.lp-b p{margin:0 0 14px;color:var(--soft);max-width:52ch}
.lp-a{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.lp-s{font-size:13px;color:var(--muted)}
.lp-step.done .lp-s{color:var(--g-earth);font-weight:600}
.primary.alt{background:var(--ink);color:var(--bg)}
.primary.alt:hover{opacity:.88;background:var(--ink)}
.primary.dark{background:#0D1B29;color:#FFD66B}
.primary.dark:hover{background:#182E40}
.secondary.dim{color:var(--muted)}
.secondary-btn{height:46px;padding:0 22px;border-radius:23px;border:1px solid var(--rule);font-size:15px;color:var(--ink)}
.secondary-btn:hover{border-color:var(--ink)}
.linkish{text-decoration:underline;text-underline-offset:3px;font-weight:600}

/* essay */
.essay-wrap,.practice-wrap{max-width:760px;padding-top:40px;padding-bottom:110px}
.essay-wrap .title,.practice-wrap .title{font-size:clamp(34px,5vw,54px)}
.essay{margin-top:40px}
.essay h3{font-family:var(--serif);font-weight:400;font-size:30px;line-height:1.15;letter-spacing:-.015em;color:var(--ink);margin:64px 0 14px}
.essay h3:first-child{margin-top:0}
.essay p:first-child{font-size:19.5px;line-height:1.68}
.essay p:first-child strong:first-child{display:inline;font-family:inherit;font-size:inherit;color:inherit;margin:0}
.essay-end{margin-top:56px;padding:26px 28px;border-radius:18px;background:var(--tint);display:flex;flex-wrap:wrap;align-items:center;gap:16px}
.essay-end p{margin:0;flex-basis:100%;font-family:var(--serif);font-size:22px}
.viz{margin:28px 0 8px;padding:22px 24px;border-radius:16px;background:#fff;border:1px solid var(--rule);font-family:var(--sans);font-size:15px;line-height:1.45;color:#0F1B24}
.viz-t{font-size:13px;font-weight:600;color:#566B77;margin-bottom:14px}
.viz figcaption{font-size:13px;color:#566B77;margin-top:12px}
.viz-wait{color:#566B77;font-style:italic}
.sc-row{display:grid;grid-template-columns:minmax(90px,28%) minmax(0,1fr) auto;gap:14px;align-items:center;padding:7px 0}
.sc-l{font-weight:500}
.sc-track{height:14px;border-radius:7px;background:#EDF2F3;overflow:hidden}
.sc-bar{height:100%;border-radius:7px;background:var(--vc)}
.sc-v{font-size:14px;color:#2E3F4A;white-space:nowrap;font-variant-numeric:tabular-nums}
.viz-steps ol,.viz-time ol,.hub ol{list-style:none;margin:0;padding:0}
.viz-steps li{display:grid;grid-template-columns:34px minmax(0,1fr);column-gap:14px;padding:0 0 18px;position:relative}
.viz-steps li::before{content:"";position:absolute;left:16px;top:34px;bottom:2px;width:2px;background:#E2E9EB}
.viz-steps li:last-child{padding-bottom:0}
.viz-steps li:last-child::before{display:none}
.viz-steps li b,.hub li b{grid-column:2;font-weight:600}
.viz-steps li span:not(.st-n),.hub li span:not(.st-n){grid-column:2;color:#2E3F4A}
.st-n{grid-row:span 2;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--vc);color:#fff;font-weight:600;font-size:14px}
.cp{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:16px;align-items:stretch}
.cp-side{border-radius:12px;background:#F3F6F7;padding:14px 16px}
.cp-side:last-child{background:color-mix(in srgb,var(--vc) 12%,#fff)}
.cp-h{font-weight:600;margin-bottom:8px}
.cp ul{margin:0;padding-left:18px}
.cp li{margin-bottom:5px;color:#2E3F4A}
.cp-vs{align-self:center;font-family:var(--serif);font-style:italic;color:#566B77}
.viz-stat{text-align:center;padding:30px 24px;background:color-mix(in srgb,var(--vc) 10%,#fff)}
.stat-v{font-family:var(--serif);font-size:clamp(48px,8vw,76px);line-height:1;letter-spacing:-.03em;color:var(--ink)}
.viz-stat .stat-v{color:#0F1B24}
.stat-l{font-weight:600;margin-top:10px}
.stat-c{color:#2E3F4A;margin-top:6px;max-width:44ch;margin-left:auto;margin-right:auto}
.an-row{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:14px;align-items:center}
.an-box{border-radius:12px;padding:16px;background:#F3F6F7;font-family:var(--serif);font-size:20px;line-height:1.3;text-align:center}
.an-like{background:color-mix(in srgb,var(--vc) 14%,#fff)}
.an-eq{font-family:var(--serif);font-style:italic;color:#566B77}
.an-why{margin-top:14px;color:#2E3F4A;text-align:center}
.viz-time ol{border-left:2px solid #E2E9EB;margin-left:6px}
.viz-time li{position:relative;padding:0 0 14px 20px;display:flex;flex-direction:column}
.viz-time li::before{content:"";position:absolute;left:-7px;top:4px;width:12px;height:12px;border-radius:50%;background:var(--vc)}
.tl-w{font-weight:600}
.tl-x{color:#2E3F4A}
.hub{display:grid;grid-template-columns:200px minmax(0,1fr);gap:22px;align-items:center}
.hub svg{width:100%;height:auto}
.hub li{display:grid;grid-template-columns:34px minmax(0,1fr);column-gap:12px;padding:6px 0}
.hub-l{stroke:#C9D6DB;stroke-width:2}
.hub-c{fill:#0F1B24}
.hub-w{fill:#fff;font:600 9px var(--sans);text-anchor:middle}
.hub-n{fill:var(--vc)}
.hub-t{fill:#fff;font:600 13px var(--sans);text-anchor:middle}
.cyc-ring{fill:none;stroke:#C9D6DB;stroke-width:2}
.cyc-arrow{fill:none;stroke:#6F97A6;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* practice */
.fc-meta{font-size:14px;color:var(--muted);margin:6px 0 16px}
.fc{display:block;width:100%;height:280px;perspective:1200px;margin:0 0 18px;text-align:center}
.fc-in{position:relative;display:block;width:100%;height:100%;transition:transform .5s ease;transform-style:preserve-3d}
.fc.flipped .fc-in{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:28px 32px;border-radius:20px;backface-visibility:hidden;font-family:var(--serif);font-size:25px;line-height:1.3}
.fc-front{background:#fff;color:#0F1B24;border:1px solid var(--rule)}
.fc-back{background:#0D1B29;color:#EEF3F4;transform:rotateY(180deg)}
.fc-k{font-family:var(--sans);font-size:12px;font-weight:600;color:#566B77}
.fc-back .fc-k{color:#FFD66B}
.fc-hint{font-family:var(--sans);font-size:13px;color:#93A9B3}
.fc-act,.pr-next{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.pr-next{margin-top:56px;padding-top:26px;border-top:1px solid var(--rule)}
.pr-done{text-align:center;padding:36px 20px;border-radius:20px;background:var(--tint)}
.pr-done p{font-size:17px;color:var(--soft);max-width:44ch;margin:12px auto 20px}
.qz-q{font-family:var(--serif);font-size:26px;line-height:1.3;margin-bottom:18px}
.qz-opts{display:grid;gap:10px;margin-bottom:18px}
.qz-o{display:flex;gap:14px;align-items:center;text-align:left;padding:14px 16px;border-radius:14px;border:1px solid var(--rule);background:#fff;color:#0F1B24;font-size:16px}
.qz-o:hover:not(:disabled){border-color:var(--ink)}
.qz-l{width:30px;height:30px;flex:none;border-radius:50%;display:grid;place-items:center;background:#EDF2F3;font-weight:600;font-size:13px}
.qz-o.right{border-color:var(--g-earth);background:color-mix(in srgb,var(--g-earth) 12%,#fff)}
.qz-o.right .qz-l{background:var(--g-earth);color:#fff}
.qz-o.wrong{border-color:var(--g-bio);background:color-mix(in srgb,var(--g-bio) 10%,#fff)}
.qz-o.wrong .qz-l{background:var(--g-bio);color:#fff}
.qz-o.dim{opacity:.55}
.qz-o:disabled{cursor:default}
.qz-why{font-size:16px;color:var(--soft);margin:0 0 18px;padding:14px 16px;border-radius:12px;background:var(--tint)}
.qz-why b{color:var(--ink)}
.ord{list-style:none;margin:0 0 18px;padding:0;display:grid;gap:8px}
.ord-i{display:grid;grid-template-columns:34px minmax(0,1fr) auto;gap:14px;align-items:center;padding:10px 12px;border-radius:14px;background:#fff;border:1px solid var(--rule);color:#0F1B24}
.ord-i .st-n{grid-row:auto}
.ord-i.right{border-color:var(--g-earth)}
.ord-i.wrong{border-color:var(--g-bio)}
.ord-t{font-size:16px}
.ord-b{display:flex;gap:4px}
.ord-b button{width:34px;height:34px;border-radius:50%;border:1px solid var(--rule);font-size:15px;color:#2E3F4A}
.ord-b button:hover:not(:disabled){border-color:#0F1B24}
.ord-b button:disabled{opacity:.3;cursor:default}
@media (max-width:640px){
  .cp,.an-row{grid-template-columns:1fr}
  .cp-vs,.an-eq{text-align:center}
  .hub{grid-template-columns:1fr}
  .hub svg{max-width:200px;margin:0 auto}
  .sc-row{grid-template-columns:1fr auto;row-gap:4px}
  .sc-track{grid-column:1 / -1;grid-row:2}
  .fc{height:240px}
  .fc-face{font-size:21px;padding:22px}
  .qz-q{font-size:22px}
  .essay h3{font-size:25px}
}

@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .tunnel{display:none}
  .tiles{grid-template-columns:1fr}
  .topic-head{grid-template-columns:1fr}
  .topic-head .glyph{display:none}
  .reader{grid-template-columns:1fr;gap:0;padding:28px 20px 96px}
  .rail{display:none}
  .m-crumbs{display:flex;flex-wrap:wrap;gap:4px 6px;font-size:13px;color:var(--muted);margin-bottom:18px;align-items:center}
  .m-crumbs button{color:var(--soft);text-decoration:underline;text-underline-offset:3px}
  .m-crumbs .d{color:var(--ink);font-weight:600;margin-right:6px}
  .m-crumbs .m-map-btn{margin-left:auto}
  .m-map{display:block;margin:-6px 0 22px;padding:12px 14px;background:var(--tint);border-radius:10px;font-size:14px}
  .m-map .map{margin-top:0}
  ul.doors{grid-template-columns:1fr}
}
@media (max-width:560px){
  .top-in{padding:0 16px;gap:12px}
  .wordmark span{display:none}
  .search{max-width:none}
  .wrap{padding:0 18px}
  .hero{padding:40px 0 24px}
  .year-n{font-size:48px}
  .tile{grid-template-columns:56px minmax(0,1fr);gap:14px}
  .tile .glyph{width:56px;height:56px}
  .t-title{font-size:20px}
  .lede{font-size:18px}
  .page{font-size:18px}
  .page p:first-child{font-size:21px}
  .node-head .glyph{display:none}
  .descend{padding:26px 22px}
}

/* pratidin additions */
.topnav{display:flex;gap:2px}
.topnav button{height:34px;padding:0 12px;border-radius:17px;font-size:14px;color:var(--soft);white-space:nowrap}
.topnav button:hover{color:var(--ink)}
.topnav button[aria-current="page"]{background:var(--tint);color:var(--ink);font-weight:500}
.topnav .s{display:none}
.hero p.demo-note{font-size:14px;color:var(--muted);margin-top:16px}
.t-meta .must,.kicker .must{background:#FFD66B;color:#0D1B29;font-weight:600;padding:0 8px;border-radius:8px}
.tile.is-read .t-title{opacity:.7}
.stratum-head{flex-wrap:wrap}
.year-n.sm{font-size:clamp(34px,4.4vw,48px);line-height:1}
.tagrow{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 0}
.tagrow span{font-size:13px;padding:3px 10px;border-radius:12px;border:1px solid var(--rule);color:var(--soft)}
.exam{margin:40px 0;padding:24px 26px;border-radius:18px;background:var(--tint)}
.exam .small-h{margin-bottom:14px}
.ex{padding:14px 0;border-top:1px solid var(--rule)}
.ex:first-of-type{border-top:0;padding-top:0}
.ex-k{font-size:13px;font-weight:600;color:var(--muted);margin-bottom:6px}
.ex p{margin:0;font-size:16px;color:var(--soft);max-width:60ch}
.ex p.ex-q{font-family:var(--serif);font-style:italic;font-size:20px;line-height:1.4;color:var(--ink)}
.syl{list-style:none;margin:0;padding:0}
.syl li{padding:3px 0;font-size:15px;color:var(--soft)}
.syl b{color:var(--ink);font-weight:600;margin-right:8px}
.shelf-cta{padding:10px 28px 40px}
.shelf-cta p{font-family:var(--serif);font-size:clamp(22px,2.6vw,28px);line-height:1.3;max-width:34ch;margin:0 0 24px}
ul.srcs{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 44px}
ul.srcs li{padding:16px 0;border-top:1px solid var(--rule);display:flex;flex-direction:column;gap:4px}
ul.srcs a{font-family:var(--serif);font-size:22px;color:var(--link);text-decoration:none}
ul.srcs a:hover{text-decoration:underline;text-underline-offset:4px}
ul.srcs span{font-size:15px;color:var(--soft)}
@media (max-width:900px){ul.srcs{grid-template-columns:1fr}}
@media (max-width:560px){.topnav .l{display:none}.topnav .s{display:inline}.topnav button{padding:0 9px;font-size:13px}.shelf-cta{padding:10px 18px 30px}.exam{padding:20px 18px}}
.pq{font-size:16px;color:var(--ink)!important;margin:0 0 8px!important}
.pq-opts{margin:0 0 10px;padding-left:22px;font-size:15px;color:var(--soft)}
.pq-opts li{padding:2px 0}
details.reveal{margin-top:10px;border-top:1px dashed var(--rule);padding-top:10px}
details.reveal summary{cursor:pointer;font-size:14px;font-weight:600;color:var(--link);list-style:none;display:inline-flex;align-items:center;gap:8px}
details.reveal summary::-webkit-details-marker{display:none}
details.reveal summary::before{content:"+";display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;border:1px solid var(--link);font-size:14px;line-height:1}
details.reveal[open] summary::before{content:"-"}
details.reveal > p{font-size:15px;color:var(--soft);margin:10px 0 0!important}
.model-ans{font-size:17px;line-height:1.65;margin-top:12px;min-height:0;color:var(--ink)}
.model-ans p:first-child{font-size:17px;line-height:1.65}
.model-ans p:first-child strong:first-child{display:inline;font-family:inherit;font-size:inherit;color:inherit;margin:0}
.model-ans h3{margin:22px 0 8px}
.ex .model-ans p{max-width:none;color:var(--ink);font-size:17px;margin:0 0 14px}
.ex .model-ans li{font-size:16px}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* ---- exam features ---- */
.vh{font-family:var(--serif);font-weight:400;font-size:clamp(34px,4.6vw,52px);line-height:1.05;letter-spacing:-.02em;margin:34px 0 10px}
.vsub{font-size:16px;color:var(--soft);max-width:68ch;margin:0 0 22px}
.linkbtn{color:var(--link);font-weight:500;text-decoration:underline;text-underline-offset:3px;text-align:left}
.cnt{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.chip{font-size:13px;padding:3px 10px;border-radius:12px;border:1px solid var(--rule);color:var(--soft);display:inline-flex;align-items:center;gap:6px}
.seg2{display:inline-flex;gap:2px;padding:3px;border-radius:20px;background:var(--tint);margin:0 0 18px}
.seg2 button{height:32px;padding:0 16px;border-radius:16px;font-size:14px;color:var(--soft)}
.seg2 button[aria-pressed="true"]{background:#fff;color:#0F1B24;font-weight:600;box-shadow:0 1px 2px rgba(0,0,0,.08)}
kbd{font-family:var(--sans);font-size:11px;padding:1px 6px;border-radius:5px;border:1px solid var(--rule);color:var(--muted);margin-left:8px}
.kbd-hint{font-size:13px;color:var(--muted);margin:14px 0 0}
.wrap.study,.wrap.pqv,.wrap.rv{padding-bottom:110px}

/* PYQs on story pages */
.pyqs{margin:40px 0;padding:24px 26px;border-radius:18px;border:1px solid var(--rule);background:color-mix(in srgb,#fff 55%,transparent)}
.pyqs-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:6px}
.pyqs-head h2{font-size:18px;font-weight:600;margin:0}
.pyqs-n{font-size:13px;color:var(--muted)}
.pyq-theme{font-size:15px;color:var(--soft);margin:0 0 16px}
.pyql{list-style:none;margin:0 0 16px;padding:0}
.pyq{padding:14px 0;border-top:1px solid var(--rule)}
.pyq-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:6px}
.pq-tag{font-size:12px;font-weight:600;letter-spacing:.02em;padding:2px 9px;border-radius:9px;background:#0F1B24;color:#fff;font-variant-numeric:tabular-nums}
.pq-note,.pq-ex{font-size:12px;color:var(--muted)}
.pyq-q{font-family:var(--serif);font-size:19px;line-height:1.4;margin:0 0 8px;color:var(--ink)}
.pyq-link{font-size:14px;color:var(--soft);margin:0 0 6px;max-width:64ch}
.pyq-src{font-size:12px;color:var(--muted)}
.t-meta .pyqc{font-weight:600;color:var(--ink)}

/* study mode */
.st-top{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap}
.st-days{display:flex;gap:8px;margin-bottom:22px}
.st-f{margin-top:0}
.st-prog{display:flex;align-items:center;gap:6px;margin:22px 0 18px}
.seg{flex:1;height:6px;border-radius:3px;background:var(--rule)}
.seg.done{background:color-mix(in srgb,var(--g-earth) 45%,transparent)}
.seg.on{background:var(--g-earth)}
.st-count{font-size:13px;color:var(--muted);margin-left:10px;white-space:nowrap;font-variant-numeric:tabular-nums}
.st-grid{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:28px;align-items:start}
.st-main{background:#fff;color:#0F1B24;border:1px solid var(--rule);border-radius:18px;padding:28px 30px}
.st-main p{font-size:17px;line-height:1.6;margin:0 0 14px;color:#2E3F4A}
.st-title{font-family:var(--serif);font-weight:500;font-size:clamp(26px,3vw,34px);line-height:1.15;margin:0 0 18px;color:#0F1B24}
.st-side{border:1px solid var(--rule);border-radius:18px;padding:20px 22px;background:var(--tint)}
.st-meta{font-size:13px;color:var(--muted);margin-bottom:12px}
.st-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}
.st-tags .must{background:#FFD66B;color:#0D1B29;font-weight:600;font-size:13px;padding:3px 10px;border-radius:12px}
.st-topics{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:6px}
.st-topics span{font-size:12px;padding:2px 9px;border-radius:10px;background:color-mix(in srgb,var(--g-earth) 14%,transparent);color:var(--soft)}
.st-h{font-size:14px;font-weight:600;margin:16px 0 6px}
.st-list{margin:0 0 12px;padding-left:18px;font-size:14px;color:var(--soft)}
.st-list li{margin-bottom:6px}
.pyq-mini li{font-size:13px}
.st-nav{display:flex;justify-content:space-between;align-items:center;margin-top:22px;gap:12px}
.st-nav .fbtn[disabled]{opacity:.4;cursor:default}
.studybtn{margin-left:auto;font-size:14px;font-weight:600;height:34px;padding:0 16px;border-radius:17px;background:#0F1B24;color:#fff}
.studybtn:hover{background:#2E3F4A}

/* PYQ bank */
.pq-f{margin-top:0}
.yr{font-size:14px;color:var(--soft);display:inline-flex;align-items:center;gap:8px;margin-left:6px}
.yr select{font:inherit;height:34px;border-radius:17px;border:1px solid var(--rule);background:transparent;color:var(--ink);padding:0 12px}
.pq-count{font-size:14px;color:var(--muted);margin:18px 0 8px}
.pqbank{list-style:none;margin:0;padding:0}
.pqcard{padding:20px 0;border-top:1px solid var(--rule)}
.pq-uses{margin-top:10px}
.pq-uses ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.pq-uses p{font-size:14px;color:var(--soft);margin:4px 0 0 18px;max-width:66ch}
.pq-use{display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:500;color:var(--ink);text-align:left;padding:5px 12px;border-radius:14px;border:1px solid var(--rule);background:color-mix(in srgb,#fff 60%,transparent)}
.pq-use:hover{border-color:var(--ink)}
.pq-kind{font-size:12px;color:var(--muted);font-weight:400}
.syl-p{margin:26px 0}
.syl-p h2{font-family:var(--serif);font-weight:400;font-size:34px;margin:0 0 8px}
.syl-row{padding:14px 0;border-top:1px solid var(--rule)}
.syl-l{font-size:16px;color:var(--ink);margin-bottom:8px;display:flex;justify-content:space-between;gap:16px}
.syl-n{font-size:13px;color:var(--muted);white-space:nowrap}
.syl-items{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 14px}

/* revise */
.rv-f{margin-top:0;margin-bottom:18px}
.rv-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-bottom:18px}
.rv-stats div{border:1px solid var(--rule);border-radius:14px;padding:12px 14px}
.rv-stats b{display:block;font-family:var(--serif);font-size:30px;font-weight:400;line-height:1.1;font-variant-numeric:tabular-nums}
.rv-stats span{font-size:13px;color:var(--muted)}
.rv-card{background:#fff;color:#0F1B24;border:1px solid var(--rule);border-radius:18px;padding:26px 28px;max-width:760px}
.rv-card .qz-why{color:#2E3F4A}
.rv-card .vsub{color:#2E3F4A}
.rv-card .stat-v{font-family:var(--serif);font-size:56px;line-height:1}
.rv-from{font-size:13px;color:#566B77;margin-bottom:14px}
.rv-front{font-family:var(--serif);font-size:26px;line-height:1.3;margin:0 0 18px}
.rv-back{font-size:18px;line-height:1.5;padding:14px 16px;border-radius:12px;background:#EDF2F3;margin:0 0 18px}
.rv-grade{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.rv-grade button{display:flex;flex-direction:column;align-items:center;gap:2px;padding:10px 6px;border-radius:12px;border:1px solid rgba(15,27,36,.14);color:#0F1B24}
.rv-grade button:hover{border-color:#0F1B24}
.rv-grade small{font-size:12px;color:#566B77}
.rv-grade kbd{margin:4px 0 0}
.rv-card .primary kbd{border-color:rgba(13,27,41,.25);color:#0D1B29}

@media (max-width:900px){
  .st-grid{grid-template-columns:1fr}
  .rv-stats{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .pyqs{padding:18px 16px}
  .st-main{padding:20px 18px}
  .rv-card{padding:20px 18px}
  .rv-front{font-size:22px}
  .studybtn{margin-left:0}
  .syl-l{flex-direction:column;gap:4px}
  .topnav button{padding:0 9px}
}
@media (max-width:980px){
  .top-in{flex-wrap:wrap;height:auto;padding-top:9px;padding-bottom:9px;row-gap:8px}
  .search{order:3;flex:1 1 100%;min-width:0;max-width:none;margin-left:0}
  .topnav{flex:1;justify-content:space-between;min-width:0}
  html{scroll-padding-top:calc(108px + env(safe-area-inset-top,0px))}
}
.search{min-width:0}
.topnav{flex:none}
@media (max-width:980px){ .topnav{flex:1} }
@media (min-width:701px) and (max-width:980px){ .topnav{justify-content:flex-start} }
@media (max-width:700px){ .topnav .l{display:none} .topnav .s{display:inline} .topnav button{padding:0 9px;font-size:13px} }
.topnav{overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch} .topnav::-webkit-scrollbar{display:none}
.wordmark{flex:none}
.wv{max-width:780px}
.w-meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:18px 0 8px}
.w-budget{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:var(--muted)}
.w-q{font-family:var(--serif);font-size:clamp(21px,3vw,27px);line-height:1.35;font-weight:500;margin:6px 0 14px}
.w-dirs{border-left:3px solid var(--link);padding:4px 0 4px 14px;margin:0 0 18px;color:var(--soft)}
.w-dirs p{margin:4px 0;font-size:15px}
.w-bar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:10px 0;background:var(--bg)}
.w-time,.w-count{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:15px;font-weight:600}
.w-sep{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:var(--muted);margin-right:auto}
.w-count{margin-right:6px}
.late{color:#b4432a}
.w-text{width:100%;min-height:52vh;box-sizing:border-box;resize:vertical;padding:16px;border:1px solid var(--rule);border-radius:14px;background:#fff;color:#0F1B24;font:17px/1.6 var(--serif)}
.w-text:focus{outline:2px solid var(--link);outline-offset:1px}
.w-after{margin-top:26px}
.w-score{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:18px}
.w-score div{border:1px solid var(--rule);border-radius:14px;padding:12px 14px;background:#fff;color:#0F1B24}
.w-score b{display:block;font-size:24px;font-family:var(--serif);font-weight:500}
.w-score span{font-size:13px;color:var(--muted)}
.w-checks{list-style:none;padding:0;margin:0 0 22px}
.w-checks li{padding:8px 0;border-bottom:1px solid var(--rule)}
.w-checks label{display:flex;gap:10px;align-items:flex-start;cursor:pointer;font-size:15px}
.w-checks input{margin-top:4px;width:17px;height:17px;flex:none}
.w-uses{list-style:none;padding:0}
.w-uses li{margin:0 0 12px}
.w-uses p{margin:4px 0 0 18px;font-size:14px;color:var(--muted)}
.w-actions{display:flex;gap:10px;margin:22px 0 40px}
.w-list{list-style:none;padding:0;margin:14px 0 40px}
.w-item{display:flex;flex-direction:column;gap:6px;align-items:flex-start;width:100%;text-align:left;border:1px solid var(--rule);border-radius:14px;padding:12px 14px;margin-bottom:10px;background:#fff;color:#0F1B24;cursor:pointer;font:inherit}
.w-iq{font-size:15px;line-height:1.45}
.w-im{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;color:var(--muted)}
.writebtn{margin-top:10px}
@media (max-width:520px){.w-score{grid-template-columns:1fr 1fr 1fr}.w-score b{font-size:20px}.w-text{min-height:48vh;font-size:16px}}
/* two-tap confirm */
.armed{color:var(--g-bio)!important;font-weight:600}
/* first-visit setup */
body.ob-open{overflow:hidden}
.ob{position:fixed;inset:0;z-index:100;background:rgba(15,27,36,.42);display:flex;align-items:center;justify-content:center;padding:24px 16px;overflow-y:auto;-webkit-overflow-scrolling:touch}
.ob-card{width:100%;max-width:520px;background:var(--bg);color:var(--ink);border-radius:20px;padding:28px 26px 24px;box-shadow:0 24px 60px rgba(15,27,36,.28);margin:auto}
.ob-dots{display:flex;gap:6px;margin-bottom:20px}
.ob-dots i{width:22px;height:4px;border-radius:2px;background:var(--rule)}
.ob-dots i.on{background:var(--ink)}
.ob-mark{margin-bottom:14px}
.ob h2{font-family:var(--serif);font-weight:400;font-size:30px;line-height:1.12;margin:0 0 12px;letter-spacing:-.01em}
.ob-k{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 8px;font-weight:600}
.ob-sub{font-size:15px;line-height:1.5;color:var(--soft);margin:0 0 18px}
.ob-note{font-size:13px;line-height:1.5;color:var(--muted);margin:18px 0 0;padding-top:14px;border-top:1px solid var(--rule)}
.ob-list{list-style:none;padding:0;margin:0 0 22px}
.ob-list li{font-size:15px;line-height:1.5;color:var(--soft);padding:10px 0;border-top:1px solid var(--rule)}
.ob-list li b{color:var(--ink);font-weight:600}
.ob-opts{display:grid;gap:10px}
.ob-opt{display:block;width:100%;text-align:left;padding:14px 16px;border-radius:14px;border:1.5px solid var(--rule);background:transparent}
.ob-opt b{display:block;font-size:16px;font-weight:600;color:var(--ink);margin-bottom:3px}
.ob-opt span{display:block;font-size:14px;line-height:1.4;color:var(--muted)}
.ob-opt[aria-pressed="true"]{border-color:var(--ink);background:var(--tint);box-shadow:inset 0 0 0 1px var(--ink)}
.ob-act{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:22px}
.ob-skip{font-size:14px;color:var(--muted);text-decoration:underline;text-underline-offset:3px}
.ob .primary.alt{margin-bottom:4px}
@media (max-width:520px){
  .ob{align-items:flex-end;padding:0}
  .ob-card{border-radius:20px 20px 0 0;padding:24px 20px calc(22px + env(safe-area-inset-bottom,0px));max-height:92vh;overflow-y:auto}
  .ob h2{font-size:26px}
  .ob-act .primary{flex:1 1 100%}
}
/* today's plan */
.daybar{border:1px solid var(--rule);border-radius:16px;padding:16px 18px 14px;margin:0 0 28px;background:rgba(255,255,255,.35)}
.db-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:6px}
.db-k{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:600}
.db-t{font-family:var(--serif);font-size:22px;line-height:1.2;margin-top:2px}
.db-list{list-style:none;padding:0;margin:0}
.db-list li{display:flex;align-items:center;gap:12px;padding:10px 0;border-top:1px solid var(--rule)}
.db-c{flex:0 0 22px;height:22px;border-radius:50%;border:1.5px solid var(--muted);display:flex;align-items:center;justify-content:center;font-size:13px;line-height:1}
.db-list li.done .db-c{background:var(--g-earth);border-color:var(--g-earth);color:#fff}
.db-l{flex:1;font-size:15px;color:var(--ink);min-width:0}
.db-l small{display:block;font-size:13px;color:var(--muted);margin-top:1px}
.db-list li.done .db-l{color:var(--muted)}
.db-list .linkbtn{font-size:14px;white-space:nowrap}
.db-resume{display:flex;flex-direction:column;align-items:flex-start;gap:2px;width:100%;text-align:left;margin-top:10px;padding:12px 14px;border-radius:12px;background:#0D1B29;color:#EEF3F4}
.db-resume span{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:#9FBFC8;font-weight:600}
.db-resume b{font-weight:500;font-size:15px;line-height:1.35}
/* new-edition notice */
.toast{position:fixed;left:50%;bottom:calc(16px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);z-index:90;display:flex;align-items:center;gap:14px;background:#0D1B29;color:#EEF3F4;border-radius:14px;padding:12px 14px 12px 18px;font-size:14px;box-shadow:0 12px 32px rgba(15,27,36,.3);width:max-content;max-width:calc(100vw - 32px)}
.toast button{background:#FFD66B;color:#0D1B29;border-radius:10px;padding:8px 14px;font-weight:600;font-size:14px;white-space:nowrap}
/* returning readers: headline and plan side by side */
.hero-back{grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);grid-template-areas:"h side" "copy side";align-items:start;column-gap:48px;row-gap:0}
.hero-back .hero-h{grid-area:h;font-size:clamp(34px,4vw,52px);margin-bottom:18px}
.hero-back .hero-side{grid-area:side}
.hero-back .hero-copy{grid-area:copy}
.hero-back .daybar{margin:0}
@media (max-width:900px){
  .hero-back{grid-template-columns:1fr;grid-template-areas:"h" "side" "copy"}
  .hero-back .hero-side{margin-bottom:22px}
  .hero-back .hero-h{font-size:32px;line-height:1.04}
}
/* revise: five modes scroll on small screens */
.seg2.seg5{display:flex;max-width:100%;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.seg2.seg5::-webkit-scrollbar{display:none}
.seg2.seg5 button{flex:0 0 auto;white-space:nowrap}
.rv-stats.pg-tiles{grid-template-columns:repeat(3,minmax(0,1fr))}
/* mock */
.mk-sizes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:16px 0}
.mk-size{border:1.5px solid var(--rule);border-radius:14px;padding:14px;text-align:left;background:#fff}
.mk-size:hover{border-color:var(--ink)}
.mk-size b{display:block;font-family:var(--serif);font-size:30px;font-weight:400;line-height:1.1}
.mk-size span{font-size:13px;color:var(--muted)}
.mk-scope{margin:4px 0 22px;align-items:center}
.mk-scope .ex-k{margin:0 6px 0 0}
.mk-hist,.mk-tab{width:100%;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums;margin-bottom:18px}
.mk-hist th,.mk-tab th{text-align:left;font-weight:600;color:var(--muted);font-size:12px;padding:6px 8px;border-bottom:1px solid var(--rule)}
.mk-hist td,.mk-tab td{padding:8px;border-bottom:1px solid var(--rule)}
.mk-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.mk-n{font-size:13px;font-weight:600;color:var(--muted);letter-spacing:.02em}
.mk-time{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:18px;font-weight:600;padding:4px 12px;border-radius:10px;background:var(--tint)}
.mk-time.late{background:color-mix(in srgb,var(--g-bio) 16%,transparent);color:#9A1B45}
.mk-q{font-size:17px;line-height:1.55;margin:0 0 14px}
.mk-run .qz-os{display:grid;gap:10px}
.mk-run .qz-o{width:100%}
.qz-o.picked{border-color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink);background:color-mix(in srgb,var(--ink) 5%,#fff)}
.qz-o.picked .qz-l{background:var(--ink);color:#fff}
.mk-act{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:16px 0}
.fbtn.on{background:color-mix(in srgb,#FFD66B 55%,transparent);border-color:#C79A1E}
.mk-pal-h{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;font-size:13px;color:var(--muted);margin-top:22px;padding-top:14px;border-top:1px solid var(--rule)}
.mk-submit{font-size:14px;font-weight:600;color:var(--ink);text-decoration:underline;text-underline-offset:3px}
.mk-pal{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px;margin-top:10px}
.mk-p{height:36px;border-radius:9px;border:1px solid var(--rule);font-size:13px;font-variant-numeric:tabular-nums;color:var(--soft);background:transparent}
.mk-p.ans{background:var(--ink);color:#fff;border-color:var(--ink)}
.mk-p.mk{box-shadow:inset 0 -4px 0 #E6A800}
.mk-p.cur{outline:2px solid var(--link);outline-offset:1px}
.mk-review{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.mk-rv{border:1px solid var(--rule);border-left-width:4px;border-radius:12px;padding:12px 14px;background:#fff}
.mk-rv.ok{border-left-color:var(--g-earth)} .mk-rv.bad{border-left-color:var(--g-bio)} .mk-rv.skip{border-left-color:var(--muted)}
.mk-rv-h{display:flex;gap:10px;font-size:13px;color:var(--muted);margin-bottom:6px}
.mk-rv-h b{color:var(--ink)}
.mk-rv-q{font-size:15px;line-height:1.5;margin:0 0 8px}
.mk-rv-a,.mk-rv-w{font-size:14px;color:var(--soft);margin:4px 0 0}
/* progress */
.pg-sec{margin:26px 0}
.pg-row{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1.6fr) 72px;gap:12px;align-items:center;padding:8px 0;border-top:1px solid var(--rule)}
.pg-l{font-size:14px;color:var(--ink);display:flex;align-items:center;gap:8px;min-width:0}
.pg-id{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}
.pg-track{height:8px;border-radius:4px;background:var(--tint);overflow:hidden}
.pg-bar{height:100%;border-radius:4px;background:var(--ink)}
.pg-v{text-align:right;font-variant-numeric:tabular-nums;line-height:1.1}
.pg-v b{display:block;font-size:15px}
.pg-v span{font-size:12px;color:var(--muted)}
.pg-sec .primary{margin-top:14px}
/* mains check */
.ev{border:1px solid var(--rule);border-radius:16px;padding:16px 18px;margin:0 0 22px;background:#fff}
.ev-h{display:flex;justify-content:space-between;align-items:baseline}
.ev-t{font-family:var(--serif);font-size:18px;color:var(--muted)}
.ev-t b{font-size:30px;color:var(--ink);font-weight:400}
.ev-list{list-style:none;padding:0;margin:8px 0 0}
.ev-list li{display:flex;gap:12px;padding:10px 0;border-top:1px solid var(--rule)}
.ev-list b{font-size:15px}
.ev-list p{margin:2px 0 0;font-size:14px;color:var(--soft);line-height:1.45}
.ev-s{flex:0 0 26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700}
.ev-good .ev-s{background:var(--g-earth);color:#fff}
.ev-part .ev-s{background:#FFD66B;color:#0D1B29}
.ev-weak .ev-s{background:var(--g-bio);color:#fff}
.ev-miss span{display:inline-block;font-size:12.5px;padding:2px 8px;margin:4px 6px 0 0;border-radius:8px;background:var(--tint);color:var(--ink)}
/* syllabus spine */
.syl-tabs{margin:0 0 14px}
.spine{list-style:none;padding:0;margin:0}
.sp{border-top:1px solid var(--rule)}
.sp-h{display:grid;grid-template-columns:52px minmax(0,1fr) auto;grid-template-rows:auto auto;column-gap:12px;row-gap:6px;width:100%;text-align:left;padding:12px 0;align-items:center}
.sp-id{font-size:12px;font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums}
.sp-t{font-size:16px;color:var(--ink);font-weight:500}
.sp-m{display:flex;gap:10px;font-size:12.5px;color:var(--muted);white-space:nowrap}
.sp-w{grid-column:2 / 4;height:4px;border-radius:2px;background:var(--tint);overflow:hidden}
.sp-w i{display:block;height:100%;background:var(--muted);border-radius:2px}
.sp.open .sp-t{font-weight:600}
.sp-b{padding:0 0 16px 64px}
.sp-off{font-size:14px;color:var(--soft);font-style:italic;margin:0 0 12px;max-width:72ch}
.sp-q{margin:4px 0 12px;padding-left:18px;font-size:14px;line-height:1.5;color:var(--soft)}
.sp-q li{margin:6px 0}
.pq-use.done{opacity:.7}
@media (max-width:640px){
  .mk-sizes{grid-template-columns:1fr 1fr 1fr}
  .rv-stats.pg-tiles{grid-template-columns:1fr 1fr}
  .pg-row{grid-template-columns:minmax(0,1fr) 64px;row-gap:6px}
  .pg-track{grid-column:1 / 3;grid-row:2}
  .sp-h{grid-template-columns:40px minmax(0,1fr)}
  .sp-m{grid-column:2;white-space:normal;flex-wrap:wrap}
  .sp-w{grid-column:2}
  .sp-b{padding-left:0}
  .mk-hist th:nth-child(6),.mk-hist td:nth-child(6){display:none}
}
/* photographs */
figure.ph{margin:26px 0 28px}
.ph-box{width:100%;max-height:440px;border-radius:14px;overflow:hidden;background:var(--tint);display:flex;align-items:center;justify-content:center}
.ph-box img{width:100%;height:100%;max-height:440px;object-fit:cover;object-position:center 35%;display:block}
figure.ph figcaption{font-size:13px;line-height:1.45;color:var(--muted);margin-top:8px;font-family:var(--sans)}
.ph-cap{color:var(--soft)}
.ph-cr a{color:var(--muted);text-decoration:underline;text-underline-offset:2px}
@media (max-width:640px){ figure.ph{margin:20px 0 22px} .ph-box,.ph-box img{max-height:300px} }
/* <feat-css> */

/* ---- daily digest, Prelims facts, Mains PYQ use ---- */
.studybtn.alt{margin-left:8px;background:transparent;color:var(--ink);border:1px solid var(--rule)}
.studybtn.alt:hover{border-color:var(--ink)}
.primary.sm{height:36px;padding:0 18px;border-radius:18px;font-size:14px}
.dgx{margin-top:26px;padding-top:22px;border-top:1px solid var(--rule)}
.dgx-h{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:10px}
.dgx-h h3{font-family:var(--serif);font-weight:400;font-size:26px;letter-spacing:-.01em;margin:0}
.dgx-h p{margin:4px 0 0;font-size:14px;color:var(--muted)}
.dgx-more{margin-top:12px;font-size:14px}
.empty.sm{padding:10px 0;font-size:14px}
.dg-list{display:grid;grid-template-columns:1fr;gap:0}
.dg{border-top:1px solid var(--rule)}
.dg:last-child{border-bottom:1px solid var(--rule)}
.dg>summary{list-style:none;cursor:pointer;padding:14px 30px 14px 0;position:relative;display:flex;flex-direction:column;gap:5px}
.dg>summary::-webkit-details-marker{display:none}
.dg>summary::after{content:"+";position:absolute;right:4px;top:12px;font-size:20px;color:var(--muted);line-height:1}
.dg[open]>summary::after{content:"\2212"}
.dg-t{font-family:var(--serif);font-size:19px;line-height:1.3;color:var(--ink)}
.dg>summary:hover .dg-t{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}
.dg-m{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;font-size:13px;color:var(--muted)}
.dg-gs{font-size:11px;font-weight:600;letter-spacing:.02em;padding:1px 7px;border-radius:8px;border:1px solid var(--rule);color:var(--soft)}
.dg-deep{font-size:11px;font-weight:600;padding:1px 8px;border-radius:8px;background:var(--ink);color:var(--bg)}
.dg-b{padding:0 0 18px}
.dg-brief{margin:0 0 14px;font-size:16px;line-height:1.55;color:var(--soft);max-width:72ch}
.dg-cols{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px}
.dg-k{font-size:12px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);margin:0 0 6px}
.dg-mains,.dg-how{margin:0 0 12px;font-size:15px;color:var(--soft)}
.dg-q{margin:0 0 6px;font-family:var(--serif);font-size:16px;line-height:1.4;color:var(--ink)}
.dg-q .pq-tag{margin-right:6px;vertical-align:2px}
.dg-a{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin-top:6px;font-size:14px}
.dg-a a{color:var(--muted)}
.dg-sec{margin:26px 0 8px}
.dg-sec h2 .cnt{margin-left:6px;font-weight:400}
.dg-none{padding:24px 26px;border-radius:18px;background:var(--tint);margin:20px 0 40px}
.dg-none p{margin:0 0 14px;font-size:16px;color:var(--soft);max-width:60ch}
.dg-foot{display:flex;flex-wrap:wrap;gap:10px;margin:30px 0 60px}
.pf-list{margin:0;padding:0 0 0 18px}
.pf-list li{margin:0 0 7px;font-size:15px;line-height:1.5;color:var(--soft)}
.pf-list li::marker{color:var(--muted)}
/* the facts box on a story */
.pfbox{margin:34px 0;padding:22px 24px 18px;border-radius:18px;border:1.5px solid color-mix(in srgb,var(--g-economy) 55%,transparent);background:color-mix(in srgb,var(--g-economy) 7%,transparent)}
.pf-h{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.pf-h h2{font-size:18px;font-weight:600;margin:0}
.pf-tag{font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:3px 9px;border-radius:9px;background:#8A5A00;color:#fff}
.pfbox .pf-list li{font-size:16px;color:var(--ink)}
.pf-more{margin:10px 0 12px}
.pf-more>summary{cursor:pointer;font-size:14px;font-weight:600;color:var(--soft)}
.fx-cards{margin:10px 0 0;padding:0 0 0 20px}
.fx-cards li{margin:0 0 8px;font-size:15px;color:var(--soft)}
.fx-cards details>summary{cursor:pointer;color:var(--ink)}
.fx-cards details p{margin:4px 0 0;padding:6px 10px;border-radius:8px;background:var(--tint);color:var(--ink)}
.fx-q{display:block;color:var(--soft)}
.fx-a{display:block;color:var(--ink);font-weight:500}
/* the facts page */
.fx-tools{align-items:center}
.fx-tools .pq-count{margin:0}
.fx-day{margin:30px 0 10px;padding-top:18px;border-top:1px solid var(--rule)}
.fx-dh{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.fx-dh h2{font-family:var(--serif);font-weight:400;font-size:34px;letter-spacing:-.02em;margin:0}
.fx-dh span{font-size:14px;color:var(--muted)}
.fx-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 34px}
.fx-story{padding:14px 0 6px;border-top:1px solid var(--rule)}
.fx-title{display:flex;gap:8px;align-items:baseline;text-align:left;font-family:var(--serif);font-size:19px;line-height:1.3;margin:0 0 10px}
.fx-title .dot{transform:translateY(-2px)}
.fx-title:hover{text-decoration:underline;text-underline-offset:4px}
.fx-rest{margin-top:16px;padding:16px 18px;border-radius:14px;background:var(--tint)}
.fx-dg{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 30px}
.fx-dg>li{font-size:15px}
.fx-src{display:flex;gap:8px;align-items:baseline;font-weight:600;color:var(--ink);margin-bottom:4px}
.fx-dg ul{margin:0;padding:0 0 0 18px;color:var(--soft)}
.fx-dg ul li{margin:0 0 4px}
/* how to use a story in a Mains answer */
.pu-fit{font-size:12px;font-weight:600;padding:2px 9px;border-radius:9px}
.pu-fit.direct{background:color-mix(in srgb,var(--g-env) 18%,transparent);color:#0B5F40}
.pu-fit.partial{background:color-mix(in srgb,var(--g-economy) 20%,transparent);color:#7A4E00}
.pu-where{font-size:12px;color:var(--muted)}
.pu-box{margin:10px 0 10px;padding:14px 16px;border-radius:12px;background:var(--tint);border-left:3px solid var(--link)}
.pu-k{font-size:12px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.pu-how{margin:0 0 8px;font-size:16px;color:var(--ink);font-weight:500;max-width:66ch}
.pu-pts{margin:0;padding:0 0 0 18px}
.pu-pts li{margin:0 0 6px;font-size:15px;line-height:1.5;color:var(--soft);max-width:66ch}
.pu-a{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center}
.pu-mini{display:block;margin-top:4px;font-size:14px;color:var(--soft)}
@media (max-width:760px){
  .dg-cols,.fx-grid,.fx-dg{grid-template-columns:1fr}
  .dgx-h h3{font-size:22px}
  .pfbox{padding:18px 16px 14px}
  .studybtn.alt{margin-left:0}
}
.dgv .vh{margin-top:4px}
@media (max-width:360px){ .topnav button{padding:0 6px;font-size:12.5px} }
.permalink{color:var(--muted);text-decoration:underline;text-underline-offset:3px}

/* </feat-css> */