:root{
  --ink:#1E1230; --ink2:#4B4361; --ink3:#81798F;
  --fog:#F4F2F6; --fog2:#E9E5EE; --line:#E0DBE6; --paper:#FFFFFF;
  --gold:#F5A83C; --gold-soft:#FDEBD0; --grass:#138A5E; --grass-soft:#DDF3EA; --red:#C93C3C; --red-soft:#FBE4E4;
  --display:"Poppins", system-ui, sans-serif;
  --ui:"Poppins", system-ui, -apple-system, "Segoe UI", sans-serif;
  --read:"Poppins", system-ui, sans-serif;
  --r-sm:10px; --r:16px; --r-lg:26px;
  --accent:var(--gold); --accent-ink:var(--ink);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--fog);color:var(--ink);font:15px/1.6 var(--ui);-webkit-font-smoothing:antialiased}
a{color:inherit}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--display);line-height:1.15;letter-spacing:-.025em;margin:0 0 .5em;font-weight:700}
h1{font-size:clamp(2rem,5vw,3.1rem)}
h2{font-size:clamp(1.45rem,3.2vw,2rem)}
h3{font-size:1.2rem;letter-spacing:-.01em}
p{margin:0 0 1em}
.ic{flex:none;vertical-align:middle}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:6px}
.muted{color:var(--ink2)} .faint{color:var(--ink3)} .small{font-size:.875rem} .tiny{font-size:.8rem}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px;margin:0 auto;padding:0 20px}
.stack>*+*{margin-top:16px}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.between{justify-content:space-between}
.grow{flex:1}
.hide{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* logo */
.logo{display:inline-flex;align-items:center;text-decoration:none;color:var(--ink);line-height:0}
.logo-svg{height:28px;width:auto;display:block;overflow:visible}
.logo-svg.sm{height:18px}
.logo-svg .eyes{transition:transform .25s ease-out}
.logo-svg .eye{transform-box:fill-box;transform-origin:center}
.logo-svg.blink .eye{animation:chumo-blink .22s ease-in-out}
@keyframes chumo-blink{0%,100%{transform:scaleY(1)}50%{transform:scaleY(.1)}}
@media (prefers-reduced-motion:reduce){.logo-svg .eyes{transition:none}.logo-svg.blink .eye{animation:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:13px 22px;font:600 1rem/1 var(--ui);cursor:pointer;text-decoration:none;background:var(--ink);color:#fff;transition:transform .12s ease,background .15s}
.btn:active{transform:scale(.98)}
.btn:hover{background:#30214A}
.btn.gold{background:var(--gold);color:var(--ink)} .btn.gold:hover{background:#F7B65A}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--line)} .btn.ghost:hover{background:var(--paper)}
.btn.white{background:var(--paper);color:var(--ink)}
.btn.danger{background:transparent;color:var(--red);box-shadow:inset 0 0 0 1.5px var(--red-soft)}
.btn.sm{padding:9px 15px;font-size:.9rem}
.btn.lg{padding:17px 28px;font-size:1.08rem}
.btn.block{width:100%}
.btn[disabled]{opacity:.55;pointer-events:none}
.link{background:none;border:0;padding:0;font:inherit;color:var(--ink);text-decoration:underline;text-underline-offset:3px;cursor:pointer}

/* forms */
label{display:block;font-weight:600;font-size:.92rem;margin-bottom:6px}
.field{margin-bottom:16px}
.hint{font-size:.83rem;color:var(--ink3);margin-top:6px}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=url],input[type=tel],select,textarea{
  width:100%;border:1.5px solid var(--line);background:var(--paper);border-radius:var(--r-sm);padding:13px 14px;font:inherit;color:var(--ink);transition:border-color .15s}
textarea{resize:vertical;min-height:110px;line-height:1.5}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--ink)}
.check{display:flex;gap:10px;align-items:flex-start;font-weight:500;font-size:.9rem}
.check input{margin-top:3px;width:18px;height:18px;accent-color:var(--ink)}

/* flash */
.flash{padding:13px 16px;border-radius:var(--r-sm);margin:0 0 16px;font-weight:500;background:var(--grass-soft);color:#0b5b3d}
.flash.error{background:var(--red-soft);color:#8a2424}

/* app chrome */
.top{background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.top .wrap{display:flex;align-items:center;gap:22px;height:64px}
.nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.nav a{padding:8px 12px;border-radius:999px;text-decoration:none;color:var(--ink2);font-weight:600;font-size:.94rem;white-space:nowrap}
.nav a.on,.nav a:hover{background:var(--fog);color:var(--ink)}
.top .spacer{flex:1}
.page{padding:32px 0 80px}
.ph{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.ph h1{margin:0}
@media (max-width:720px){
  .top .wrap{gap:12px;height:58px}
  .top .nav{position:fixed;bottom:0;left:0;right:0;background:var(--paper);border-top:1px solid var(--line);justify-content:space-around;padding:8px 6px calc(8px + env(safe-area-inset-bottom));z-index:30}
  .nav a{font-size:.8rem;padding:6px 8px;display:flex;flex-direction:column;align-items:center;gap:2px}
  .page{padding:22px 0 110px}
  .top .newbtn span{display:none}
}
.nav a .ic{display:none}
@media (max-width:720px){.nav a .ic{display:block}}

/* panels */
.panel{background:var(--paper);border-radius:var(--r);padding:24px;border:1px solid var(--line)}
.panel+.panel{margin-top:16px}
.panel h2{font-size:1.3rem}
@media (max-width:560px){.panel{padding:18px}}

/* stat strip */
.stats{display:grid;grid-template-columns:repeat(3,1fr);background:var(--ink);color:#fff;border-radius:var(--r);overflow:hidden;margin-bottom:28px}
.stats div{padding:20px 22px;border-left:1px solid rgba(255,255,255,.12)}
.stats div:first-child{border-left:0}
.stats strong{display:block;font:700 1.7rem/1.1 var(--display);letter-spacing:-.02em}
.stats span{font-size:.86rem;color:#c9c7e6}
@media (max-width:560px){.stats{grid-template-columns:1fr 1fr}.stats div:last-child{grid-column:1/-1;border-left:0;border-top:1px solid rgba(255,255,255,.12)}}

/* book (course cover object) */
.book{position:relative;aspect-ratio:3/4;border-radius:4px 12px 12px 4px;overflow:hidden;box-shadow:0 1px 0 rgba(0,0,0,.05),0 18px 34px -18px rgba(23,21,59,.55);background:var(--fog2)}
.book img{width:100%;height:100%;object-fit:cover}
.book:before{content:"";position:absolute;inset:0 auto 0 0;width:9px;background:linear-gradient(90deg,rgba(0,0,0,.28),rgba(255,255,255,.12) 60%,rgba(0,0,0,0));z-index:1}
.book:after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,rgba(255,255,255,.18),rgba(255,255,255,0) 40%);pointer-events:none}

/* shelf (dashboard) */
.shelf{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:28px 22px}
.shelf a.item{text-decoration:none;display:block}
.shelf .item .book{transition:transform .2s ease}
.shelf .item:hover .book{transform:translateY(-4px) rotate(-1deg)}
.shelf .meta{margin-top:12px}
.shelf .meta strong{display:block;font-size:.98rem;line-height:1.3}
.shelf .meta span{font-size:.84rem;color:var(--ink2)}
.shelf .new{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;aspect-ratio:3/4;border:2px dashed var(--line);border-radius:12px;color:var(--ink2);font-weight:600;text-decoration:none;background:rgba(255,255,255,.5)}
.shelf .new:hover{border-color:var(--ink);color:var(--ink)}
@media (max-width:480px){.shelf{grid-template-columns:1fr 1fr;gap:22px 14px}}

.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;font-size:.78rem;font-weight:600;background:var(--fog);color:var(--ink2)}
.pill.live{background:var(--grass-soft);color:#0b6b46}
.pill.draft{background:var(--gold-soft);color:#7a5200}
.pill.work{background:#E5E8FF;color:#3340a8}
.dot{width:7px;height:7px;border-radius:50%;background:currentColor}

/* create wizard */
.creator{display:grid;grid-template-columns:1fr 330px;gap:28px;align-items:start}
@media (max-width:900px){.creator{grid-template-columns:1fr}}
.modes{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:18px}
.modes button{border:1.5px solid var(--line);background:var(--paper);border-radius:var(--r-sm);padding:14px 8px;font:600 .92rem var(--ui);color:var(--ink2);cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:6px}
.modes button[aria-pressed=true]{border-color:var(--ink);color:var(--ink);background:var(--fog)}
@media (max-width:480px){.modes{grid-template-columns:1fr 1fr}}
.seg{display:flex;background:var(--fog);border-radius:999px;padding:4px;gap:2px}
.seg label{flex:1;margin:0;text-align:center;padding:9px 6px;border-radius:999px;cursor:pointer;font-size:.88rem;color:var(--ink2)}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg input:checked+span{color:var(--ink)}
.seg label:has(input:checked){background:var(--paper);box-shadow:0 1px 3px rgba(23,21,59,.12);color:var(--ink)}
.seg label:has(input:focus-visible){outline:3px solid var(--gold)}
.drop{border:2px dashed var(--line);border-radius:var(--r);padding:30px 18px;text-align:center;cursor:pointer;background:var(--fog)}
.drop.on{border-color:var(--ink);background:var(--paper)}
.side-note{position:sticky;top:88px}
.side-note ol{padding-left:20px;margin:0}
.side-note li{margin-bottom:10px}

/* building overlay */
.building{position:fixed;inset:0;background:rgba(23,21,59,.92);color:#fff;z-index:100;display:flex;align-items:center;justify-content:center;padding:24px}
.building .box{max-width:420px;width:100%;text-align:center}
.building .pages{position:relative;width:150px;height:200px;margin:0 auto 30px}
.building .pages i{position:absolute;inset:0;border-radius:4px 12px 12px 4px;background:#fff;opacity:.15;animation:flip 2.4s ease-in-out infinite;transform-origin:left center}
.building .pages i:nth-child(2){animation-delay:.4s;background:var(--gold);opacity:.9}
.building .pages i:nth-child(3){animation-delay:.8s}
@keyframes flip{0%,100%{transform:perspective(600px) rotateY(0)}50%{transform:perspective(600px) rotateY(-28deg)}}
.building .step{color:#c9c7e6;min-height:1.6em}
@media (prefers-reduced-motion:reduce){.building .pages i{animation:none}}

/* outline view */
.course-head{display:grid;grid-template-columns:200px 1fr;gap:30px;align-items:center;margin-bottom:28px}
.course-head .book{max-width:200px}
@media (max-width:640px){.course-head{grid-template-columns:110px 1fr;gap:18px}.course-head h1{font-size:1.5rem}}
.outcomes{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:10px 18px}
.outcomes li{display:flex;gap:10px}
.outcomes .ic{color:var(--grass);margin-top:2px}
@media (max-width:600px){.outcomes{grid-template-columns:1fr}}
.module{border-top:1px solid var(--line);padding:18px 0}
.module:first-child{border-top:0;padding-top:4px}
.module h3{display:flex;gap:12px;align-items:baseline;margin-bottom:4px}
.module h3 small{font:600 .8rem var(--ui);color:var(--ink3);flex:none}
.module ol{margin:10px 0 0;padding:0;list-style:none}
.module li{display:flex;gap:12px;align-items:flex-start;padding:9px 0}
.module li .n{flex:none;width:34px;font:600 .8rem/1.6 var(--ui);color:var(--ink3)}
.module li a{text-decoration:none}
.module li a:hover strong{text-decoration:underline}
.module li .st{margin-left:auto;flex:none}
.unlock{background:var(--ink);color:#fff;border-radius:var(--r-lg);padding:28px;position:sticky;top:88px}
.unlock .price{font:700 2.4rem/1 var(--display);letter-spacing:-.03em;margin:12px 0 4px}
.unlock ul{list-style:none;padding:0;margin:18px 0 22px}
.unlock li{display:flex;gap:10px;padding:5px 0;color:#dddcf2}
.unlock li .ic{color:var(--gold)}
.split{display:grid;grid-template-columns:1fr 340px;gap:24px;align-items:start}
@media (max-width:900px){.split{grid-template-columns:1fr}.unlock{position:static}}

/* writing progress */
.meter{height:12px;background:var(--fog2);border-radius:999px;overflow:hidden}
.meter i{display:block;height:100%;background:var(--gold);border-radius:999px;transition:width .6s ease;width:0}
.feed{list-style:none;padding:0;margin:0}
.feed li{display:flex;gap:12px;align-items:center;padding:11px 0;border-top:1px solid var(--line);font-size:.95rem}
.feed li:first-child{border-top:0}
.feed .s{width:22px;height:22px;border-radius:50%;flex:none;display:flex;align-items:center;justify-content:center;background:var(--fog2);color:var(--ink3)}
.feed li.done .s{background:var(--grass);color:#fff}
.feed li.now .s{background:var(--gold);color:var(--ink);animation:pulse 1.2s ease-in-out infinite}
.feed li.err .s{background:var(--red);color:#fff}
@keyframes pulse{50%{transform:scale(1.15)}}

/* tabs */
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:22px;overflow-x:auto;scrollbar-width:none}
.tabs a{padding:12px 14px;text-decoration:none;color:var(--ink2);font-weight:600;font-size:.95rem;border-bottom:2.5px solid transparent;margin-bottom:-1px;white-space:nowrap}
.tabs a.on{color:var(--ink);border-color:var(--ink)}

.linkbox{display:flex;gap:8px;align-items:center;background:var(--fog);border-radius:var(--r-sm);padding:6px 6px 6px 14px}
.linkbox code{flex:1;font:500 .92rem var(--ui);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.kit-item{position:relative;background:var(--fog);border-radius:var(--r-sm);padding:16px 16px 16px;white-space:pre-wrap;font-size:.95rem}
.kit-item+.kit-item{margin-top:10px}
.kit-item .copy{position:absolute;top:10px;right:10px}
.kit-item .txt{padding-right:70px}

table.t{width:100%;border-collapse:collapse;font-size:.92rem}
table.t th{text-align:left;font-weight:600;color:var(--ink2);padding:10px 8px;border-bottom:1px solid var(--line);white-space:nowrap}
table.t td{padding:12px 8px;border-bottom:1px solid var(--fog2);vertical-align:top}
.tscroll{overflow-x:auto}

.swatches{display:flex;gap:10px;flex-wrap:wrap}
.swatches label{margin:0;cursor:pointer}
.swatches input{position:absolute;opacity:0}
.swatches span{display:block;width:44px;height:44px;border-radius:12px;box-shadow:inset 0 0 0 1px rgba(0,0,0,.08)}
.swatches input:checked+span{box-shadow:0 0 0 3px var(--paper),0 0 0 5px var(--ink)}

/* auth */
.auth{min-height:100vh;display:grid;grid-template-columns:1fr 1fr}
.auth .side{background:var(--ink);color:#fff;padding:48px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.auth .side .logo{color:var(--gold)}
.auth .side h2{font-size:clamp(1.8rem,3vw,2.6rem);max-width:13ch}
.auth .form{display:flex;align-items:center;justify-content:center;padding:40px 22px;background:var(--paper)}
.auth .form>div{width:100%;max-width:400px}
@media (max-width:820px){.auth{grid-template-columns:1fr}.auth .side{display:none}.auth .form{align-items:flex-start;padding-top:48px}}

/* reading (lessons) */
.prose{font:1.02rem/1.8 var(--read);color:#2a2850}
.prose h2{font:700 1.35rem/1.3 var(--display);margin:1.9em 0 .55em;letter-spacing:-.015em}
.prose h3{font:700 1.18rem/1.25 var(--display);margin:1.6em 0 .5em}
.prose p,.prose ul,.prose ol{margin:0 0 1.05em}
.prose li{margin-bottom:.4em}
.prose strong{font-weight:650;color:var(--ink)}
.prose blockquote{margin:1.6em 0;padding:4px 0 4px 22px;border-left:4px solid var(--accent);font:600 1.15rem/1.5 var(--display);letter-spacing:-.01em;color:var(--ink)}
.prose blockquote p{margin:0}
.prose table{width:100%;border-collapse:collapse;font:.95rem/1.45 var(--ui);margin:1.2em 0;display:block;overflow-x:auto}
.prose th,.prose td{border-bottom:1px solid var(--line);padding:9px 10px;text-align:left}
.prose th{background:var(--fog);font-weight:600}
.prose code{font-size:.9em;background:var(--fog);padding:2px 5px;border-radius:5px}
.prose a{text-underline-offset:3px}
@media (max-width:560px){.prose{font-size:.98rem}}

/* misc */
.empty{text-align:center;padding:50px 20px}
.empty .book{width:120px;margin:0 auto 18px}
.notice{background:var(--gold-soft);border-radius:var(--r-sm);padding:14px 16px;font-size:.93rem}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:640px){.grid2{grid-template-columns:1fr}}
.foot{padding:40px 0;color:var(--ink3);font-size:.86rem}