:root{--bg:#070d10;--bg2:#0b1316;--fg:#f1efe2;--mute:#b9c9bc;--card:rgba(10,16,24,.78);--line:rgba(241,239,226,.18);--accent:#d7b8ff;--hot:#ff5c7a;--pink:#ff1f80;--mint:#3ae3ad;--ink:#17102a}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--fg);font:400 1rem/1.65 Inter,system-ui,-apple-system,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:
 radial-gradient(60vmax 50vmax at 85% -10%,rgba(215,184,255,.16),transparent 60%),
 radial-gradient(50vmax 40vmax at -10% 30%,rgba(255,31,128,.10),transparent 60%),
 radial-gradient(40vmax 40vmax at 50% 110%,rgba(58,227,173,.07),transparent 60%),
 radial-gradient(ellipse at center,transparent 55%,rgba(18,6,34,.6)),var(--bg)}
a{color:var(--accent)}a:hover{color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.skip{position:absolute;left:-999px;top:0}.skip:focus{left:1rem;top:1rem;background:var(--bg2);padding:.5rem 1rem;z-index:9}
h1,h2,h3{font-family:'IM Fell English',Georgia,serif;font-weight:400;line-height:1.08;margin:0 0 .8rem;letter-spacing:-.005em}
h1{font-size:clamp(2.1rem,6vw,3.6rem)}h2{font-size:clamp(1.6rem,4vw,2.3rem)}h3{font-size:1.35rem}
em{font-style:italic;color:var(--hot)}
p{margin:0 0 1rem}
.tag{display:block;font-size:.7rem;letter-spacing:.26em;text-transform:uppercase;color:var(--accent);margin-bottom:.8rem}
.muted{color:var(--mute)}.small{font-size:.86rem}
/* header */
.top{position:sticky;top:0;z-index:5;background:linear-gradient(rgba(7,13,16,.92),rgba(7,13,16,.78));backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top-in{max-width:1120px;margin:0 auto;padding:.7rem clamp(1rem,4vw,2rem);display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.7rem;color:var(--fg);text-decoration:none;margin-right:auto}
.brand img{width:34px;height:34px;border-radius:6px;display:block}
.brand b{font:400 1.25rem/1 'IM Fell English',Georgia,serif;letter-spacing:.16em;text-transform:uppercase;font-weight:400}
.brand span{display:block;font-size:.62rem;letter-spacing:.24em;text-transform:uppercase;color:var(--mute);margin-top:.25rem}
.nav{display:flex;gap:.35rem;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch;padding:.3rem;border:1px solid var(--line);border-radius:99px;background:var(--card);max-width:100%}
.nav::-webkit-scrollbar{display:none}
.nav a{flex:0 0 auto;color:var(--mute);text-decoration:none;font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;padding:.45rem .85rem;border-radius:99px;white-space:nowrap}
.nav a:hover{color:var(--accent)}
.nav a[aria-current=page]{background:var(--accent);color:var(--ink)}
@media(max-width:760px){.top-in{gap:.6rem}.nav{order:3;width:100%}}
/* layout */
main{max-width:1120px;margin:0 auto;padding:clamp(1.5rem,4vw,3rem) clamp(1rem,4vw,2rem) 4rem}
.hero{padding:1rem 0 1.5rem}
.hero p.lead{font-size:clamp(1.05rem,2.2vw,1.2rem);color:#e2e8de;max-width:44em}
.grid{display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}
.grid.two{grid-template-columns:repeat(auto-fit,minmax(min(100%,420px),1fr))}
.panel{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:clamp(1.2rem,3vw,2rem);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);min-width:0}
.panel.glow{box-shadow:0 0 0 5px rgba(10,16,24,.5),0 0 0 6px var(--line)}
.panel h2:first-child,.panel h3:first-child{margin-top:0}
.card-link{display:block;text-decoration:none;color:var(--fg);transition:transform .25s,border-color .25s}
.card-link:hover{transform:translateY(-3px);border-color:rgba(215,184,255,.55);color:var(--fg)}
.card-link .go{color:var(--accent);font-size:.85rem;letter-spacing:.06em}
.num{font:400 2.6rem/1 'IM Fell English',serif;color:var(--hot);display:block;margin-bottom:.4rem}
.stack>*+*{margin-top:1.1rem}
.section{margin-top:2.2rem}
/* prose */
.prose h3{font-size:1.3rem;margin:1.6rem 0 .6rem;color:var(--fg)}
.prose ul{margin:0 0 1rem;padding-left:1.15rem}
.prose li{margin:.35rem 0;color:#e2e8de}
.prose li::marker{color:var(--hot)}
.prose p{color:#e2e8de}
.prose blockquote{margin:1.2rem 0;padding:.2rem 0 .2rem 1rem;border-left:2px solid var(--hot);font:italic 400 1.35rem/1.3 'IM Fell English',serif;color:var(--fg)}
.prose a{word-break:break-word}
/* badges */
.badge{display:inline-block;font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;padding:.25rem .6rem;border-radius:99px;border:1px solid var(--line);color:var(--mute);vertical-align:middle}
.badge.yours{background:rgba(58,227,173,.12);border-color:rgba(58,227,173,.5);color:var(--mint)}
.badge.wait{background:rgba(255,92,122,.1);border-color:rgba(255,92,122,.5);color:var(--hot)}
.badge.done{background:rgba(58,227,173,.12);border-color:rgba(58,227,173,.5);color:var(--mint)}
.draft{border:1px dashed #f7b500;background:rgba(247,181,0,.08);color:#ffd466;border-radius:12px;padding:.6rem .85rem;font-size:.85rem;margin:0 0 1rem}
.draft b{letter-spacing:.08em;text-transform:uppercase;font-size:.72rem}
.notice{border:1px solid rgba(58,227,173,.45);background:rgba(58,227,173,.08);border-radius:12px;padding:.7rem .9rem;margin:0 0 1.2rem;color:#c9f5e6}
.error{border:1px solid rgba(255,92,122,.5);background:rgba(255,92,122,.1);border-radius:12px;padding:.7rem .9rem;margin:0 0 1.2rem;color:#ffc2cd}
/* forms */
label{display:block;font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--mute);margin:0 0 .4rem}
input,select,textarea{width:100%;font:inherit;font-size:16px;color:var(--fg);background:rgba(241,239,226,.06);border:1px solid var(--line);border-radius:12px;padding:.8rem .9rem;min-height:48px}
textarea{min-height:140px;resize:vertical;line-height:1.5}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--mute) 50%),linear-gradient(135deg,var(--mute) 50%,transparent 50%);background-position:calc(100% - 20px) 50%,calc(100% - 15px) 50%;background-size:5px 5px;background-repeat:no-repeat}
select option{background:#0b1316;color:var(--fg)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:transparent}
.field{margin-bottom:1rem}
.row{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr))}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:48px;padding:.8rem 1.6rem;border-radius:99px;border:0;background:var(--accent);color:var(--ink);font:500 .95rem/1 Inter,sans-serif;letter-spacing:.05em;text-decoration:none;cursor:pointer;transition:transform .25s,box-shadow .25s}
.btn:hover{transform:translateY(-2px);box-shadow:0 0 30px rgba(215,184,255,.5);color:var(--ink)}
.btn.ghost{background:transparent;color:var(--fg);border:1px solid var(--line)}
.btn.ghost:hover{color:var(--fg);box-shadow:none;border-color:var(--accent)}
.btn.small{min-height:38px;padding:.5rem 1rem;font-size:.8rem}
.btn.block{width:100%}
.inline{display:inline}
/* login */
.login-wrap{min-height:calc(100vh - 0px);display:grid;place-items:center;padding:2rem 1rem}
.login{width:100%;max-width:440px}
.login .logo{display:flex;flex-direction:column;align-items:center;gap:.9rem;text-align:center;margin-bottom:1.6rem;text-decoration:none;color:var(--fg)}
.login .logo img{width:64px;height:64px;border-radius:10px}
.login .logo b{font:400 1.7rem/1 'IM Fell English',Georgia,serif;letter-spacing:.18em;text-transform:uppercase;font-weight:400}
.login h1{font-size:clamp(1.9rem,6vw,2.5rem);text-align:center}
.login .lead{text-align:center;color:var(--mute);margin-bottom:1.4rem}
.fine{text-align:center;color:var(--mute);font-size:.82rem;margin-top:1.2rem}
/* lists */
.qa{border-top:1px solid var(--line);padding-top:1rem;margin-top:1rem}
.qa:first-of-type{border-top:0;margin-top:0;padding-top:0}
.qa .q{font-weight:500;color:var(--fg);white-space:pre-wrap;margin:.35rem 0 .6rem}
.qa .a{white-space:pre-wrap;color:#e2e8de;border-left:2px solid var(--accent);padding-left:.9rem;margin:.4rem 0 0}
.meta{font-size:.78rem;color:var(--mute);letter-spacing:.03em}
.table{width:100%;border-collapse:collapse;font-size:.92rem}
.table th,.table td{text-align:left;padding:.7rem .5rem;border-bottom:1px solid var(--line);vertical-align:top}
.table th{font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--mute);font-weight:500}
.scroll-x{overflow-x:auto;-webkit-overflow-scrolling:touch}
@media(max-width:640px){.table.cards thead{display:none}.table.cards tr{display:block;border-bottom:1px solid var(--line);padding:.6rem 0}.table.cards td{display:block;border:0;padding:.15rem 0}}
.picker{display:grid;gap:.8rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr))}
.picker button{text-align:left;width:100%;background:var(--card);border:1px solid var(--line);border-radius:16px;color:var(--fg);padding:1rem 1.1rem;font:inherit;cursor:pointer;transition:border-color .2s,transform .2s}
.picker button:hover{border-color:var(--accent);transform:translateY(-2px)}
.picker button b{display:block;font:400 1.25rem/1.2 'IM Fell English',serif;margin-bottom:.25rem}
.picker button span{color:var(--mute);font-size:.88rem}
.phases{counter-reset:ph;display:grid;gap:.8rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr))}
.kv{display:flex;flex-wrap:wrap;gap:.5rem 1.4rem}
.stat b{display:block;font:400 2.2rem/1 'IM Fell English',serif;color:var(--fg)}
.stat span{font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--mute)}
details summary{cursor:pointer;color:var(--accent);list-style:none}
details summary::-webkit-details-marker{display:none}
footer.foot{border-top:1px solid var(--line);color:var(--mute);font-size:.8rem;text-align:center;padding:1.6rem 1rem 2.4rem}
footer.foot a{color:var(--mute)}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

/* v1.2 */
.badge.new{background:rgba(198,244,50,.14);border-color:rgba(198,244,50,.6);color:#d9ff6a;font-size:.6rem;padding:.12rem .45rem;margin-right:.25rem;vertical-align:.1em}
.prose ol{margin:0 0 1rem;padding-left:1.3rem}.prose ol li::marker{color:var(--hot);font-weight:500}
.prose table.md{font-size:.88rem;margin:.4rem 0 1.2rem}.prose table.md td{color:#e2e8de}
.prose table.md td:first-child{font-weight:500;color:var(--fg);white-space:nowrap}
pre.code{background:rgba(0,0,0,.45);border:1px solid var(--line);border-radius:12px;padding:1rem;overflow-x:auto;font:400 .85rem/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;color:#d9ff6a;margin:.4rem 0 1.2rem}
.toc{display:flex;flex-wrap:wrap;gap:.45rem;margin-top:1rem}
.toc a{display:inline-flex;align-items:center;gap:.45rem;padding:.45rem .8rem;border:1px solid var(--line);border-radius:99px;background:var(--card);color:var(--mute);text-decoration:none;font-size:.82rem}
.toc a b{font:400 1rem/1 'IM Fell English',serif;color:var(--hot)}
.toc a:hover{border-color:var(--accent);color:var(--fg)}
.related{margin-top:1.4rem;padding-top:1rem;border-top:1px dashed var(--line)}
.arts{list-style:none;padding:0;margin:.2rem 0 .8rem}.arts li{padding:.45rem 0;border-bottom:1px solid rgba(241,239,226,.08)}
.arts li::marker{content:none}.arts a{color:var(--fg);text-decoration:none}.arts a:hover{color:var(--accent)}
.lead-prose p{color:#e2e8de;font-size:1.08rem;max-width:44em}.lead-prose blockquote{font:italic 400 1.6rem/1.2 'IM Fell English',serif;border-left:2px solid var(--hot);padding-left:1rem;margin:1rem 0}
.quote{font:italic 400 1.7rem/1.2 'IM Fell English',serif;color:var(--fg);margin:1rem 0}
/* periodic table */
:root{--g-content:#ff1f80;--g-access:#0d0d0d;--g-entity:#c6f432;--g-community:#2f6bff}
.legend{display:flex;flex-wrap:wrap;gap:.5rem 1rem;margin-bottom:1rem}
.legend .lg{display:inline-flex;align-items:center;gap:.4rem;color:var(--mute);font-size:.78rem;text-decoration:none;letter-spacing:.04em}
.legend .lg i{width:14px;height:14px;border-radius:3px;display:inline-block;border:1px solid rgba(241,239,226,.4)}
.lg.g-content i{background:var(--g-content)}.lg.g-access i{background:var(--g-access)}.lg.g-entity i{background:var(--g-entity)}.lg.g-community i{background:var(--g-community)}
.lg.g-avoid i,.el.g-avoid,.el-big.g-avoid{background:repeating-linear-gradient(135deg,#f1efe2 0 7px,#111 7px 14px)}
.grp{margin-top:1.4rem}.grp h3{font-size:1.4rem;margin-bottom:.2rem}.grp .gn{font-size:.8rem;letter-spacing:.2em;color:var(--accent);font-family:Inter,sans-serif;margin-right:.3rem}
.tiles{display:grid;gap:.5rem;grid-template-columns:repeat(auto-fill,minmax(104px,1fr))}
@media(max-width:480px){.tiles{grid-template-columns:repeat(3,1fr)}}
.el{position:relative;display:flex;flex-direction:column;justify-content:space-between;aspect-ratio:1/1;padding:.45rem .55rem;border-radius:10px;text-decoration:none;color:#fff;border:1.5px solid rgba(241,239,226,.25);transition:transform .2s,box-shadow .2s;min-width:0;overflow:hidden}
.el:hover,.el:focus-visible{transform:translateY(-3px);box-shadow:0 0 0 2px var(--accent),0 10px 24px rgba(0,0,0,.4)}
.el .n{font-size:.68rem;opacity:.85}.el .s{font:400 2rem/1 'IM Fell English',Georgia,serif}.el .t{font-size:.66rem;line-height:1.2;letter-spacing:.02em}
.el .d{position:absolute;top:.35rem;right:.4rem;font-size:.55rem;text-transform:uppercase;letter-spacing:.1em;background:#f7b500;color:#111;border-radius:4px;padding:0 .25rem}
.el.g-content{background:var(--g-content)}.el.g-access{background:var(--g-access);border-color:rgba(241,239,226,.55)}.el.g-entity{background:var(--g-entity);color:#111}.el.g-community{background:var(--g-community)}
.el.g-avoid{color:#111}.el.g-avoid .s,.el.g-avoid .t,.el.g-avoid .n{background:#f1efe2;border-radius:4px;padding:0 .2rem;align-self:flex-start}
.steps{list-style:none;padding:0;margin:.4rem 0;counter-reset:st;display:grid;gap:.6rem}
.steps li{counter-increment:st;display:grid;grid-template-columns:2.4rem 1fr;gap:.1rem .8rem;align-items:baseline;padding:.6rem 0;border-bottom:1px solid var(--line)}
.steps li::before{content:counter(st);grid-row:span 2;font:400 2rem/1 'IM Fell English',serif;color:var(--hot)}
.steps b{font-weight:500}.steps span{color:var(--mute);font-size:.92rem}
.el-modal{display:none}
.el-modal:target{display:grid;place-items:center;position:fixed;inset:0;z-index:50;padding:1rem}
.el-shade{position:absolute;inset:0;background:rgba(3,6,8,.78);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.el-card{position:relative;max-width:560px;width:100%;max-height:86vh;overflow:auto;background:rgba(10,16,24,.97)}
.el-x{position:absolute;top:.6rem;right:.9rem;font-size:1.8rem;line-height:1;color:var(--mute);text-decoration:none}
.el-head{display:flex;gap:1rem;align-items:center;margin-bottom:1rem}.el-head h2{margin:0}
.el-big{flex:0 0 auto;width:84px;height:84px;border-radius:12px;display:flex;flex-direction:column;justify-content:center;align-items:center;font:400 2.4rem/1 'IM Fell English',serif;color:#fff;border:1.5px solid rgba(241,239,226,.3)}
.el-big .n{font:400 .7rem/1 Inter,sans-serif;opacity:.85;margin-bottom:.2rem}
.el-big.g-content{background:var(--g-content)}.el-big.g-access{background:var(--g-access)}.el-big.g-entity{background:var(--g-entity);color:#111}.el-big.g-community{background:var(--g-community)}.el-big.g-avoid{color:#111}
/* library */
.search{display:flex;gap:.6rem;margin-bottom:1rem}.search input{flex:1}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.chips{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center;margin:.5rem 0}.chips .meta{min-width:4.5rem}
.chip{padding:.35rem .75rem;border:1px solid var(--line);border-radius:99px;color:var(--mute);text-decoration:none;font-size:.8rem}
.chip.on{background:var(--accent);color:var(--ink);border-color:var(--accent)}.chip:hover{border-color:var(--accent)}
.lib{display:grid;gap:.9rem;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))}
.art h3{font-size:1.25rem;margin:.4rem 0}

.bar{height:8px;border-radius:99px;background:rgba(241,239,226,.1);overflow:hidden;margin:.8rem 0 .4rem}.bar.big{height:10px;max-width:520px}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--hot),var(--accent));border-radius:99px}
.tick{margin-top:1.2rem;padding-top:1rem;border-top:1px dashed var(--line)}
.done-lesson{border-color:rgba(58,227,173,.45)}
.hero .tag a{color:var(--accent);text-decoration:none}

/* v1.3 polish */
[id]{scroll-margin-top:150px}
@media(max-width:760px){
 .nav{flex-wrap:wrap;overflow:visible;border-radius:18px;justify-content:flex-start;gap:.2rem}
 .nav a{padding:.4rem .62rem;font-size:.68rem;letter-spacing:.07em}
 [id]{scroll-margin-top:210px}
 h1{font-size:clamp(1.85rem,8.4vw,2.4rem)}
 .phases{grid-template-columns:1fr 1fr}
 .phases .panel{padding:1rem}.phases h3{font-size:1.1rem}.phases .num{font-size:2rem}
}
.login .panel .tag{text-align:center}

.badge.upd{background:rgba(143,208,255,.14);border-color:rgba(143,208,255,.6);color:#9fd8ff;font-size:.6rem;padding:.12rem .45rem;margin-right:.3rem;vertical-align:.1em}
.updnote{display:block;font-size:.76rem;color:#9fd8ff;opacity:.9;margin:.15rem 0 .35rem;font-style:normal}
.updnote a{color:#9fd8ff}

@media(max-width:760px){.top{position:static}[id]{scroll-margin-top:16px}}