/* Layout: dark product site with hash-routed views. Home (hero, coverage, library, method) · Reader (sticky chapter bar, side contents, readable column with collapsible Creole boxes and per-exercise actions) · Student dashboard · Teachers (homework composer) · Pricing. Single committed dark theme; the reader offers a light "paper" mode. */
:root{
  color-scheme:dark;
  --bg:#08090C; --bg-2:#0D0F14; --surface:#12151C; --surface-2:#171B24;
  --border:rgba(255,255,255,.08); --border-2:rgba(255,255,255,.14);
  --text:#EDEFF4; --text-2:#A3AAB8; --text-3:#6B7385;
  --accent:#7C9CFF; --accent-2:#5EEAD4; --accent-ink:#0A0F1F;
  --warm:#F5B85C; --violet:#B69CFF;
  --sans:"Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif:"Instrument Serif", "Iowan Old Style", Georgia, serif;
  --mono:"Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --r:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:15.5px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
.wrap{max-width:1180px;margin:0 auto;padding-inline:24px}
h1,h2,h3{margin:0;text-wrap:balance;letter-spacing:-.025em;font-weight:600}
.mono{font-family:var(--mono)}
.kicker{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--text-3)}
.kicker i{width:6px;height:6px;border-radius:50%;background:var(--accent-2);box-shadow:0 0 12px var(--accent-2)}
.ico{width:16px;height:16px;flex:none;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* ---------- nav ---------- */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(8,9,12,.72);backdrop-filter:saturate(160%) blur(14px);-webkit-backdrop-filter:saturate(160%) blur(14px);border-bottom:1px solid var(--border)}
.nav .wrap{display:flex;align-items:center;gap:28px;height:62px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:600;letter-spacing:-.01em;font-size:15.5px;white-space:nowrap}
.logo .m{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--accent-ink);font-family:var(--serif);font-style:italic;font-size:19px;line-height:1}
.nav nav{display:flex;gap:4px;flex:1}
.nav nav a{text-decoration:none;color:var(--text-2);font-size:14px;padding:7px 12px;border-radius:8px;transition:color .15s,background .15s}
.nav nav a:hover{color:var(--text);background:rgba(255,255,255,.05)}
.nav .right{display:flex;gap:10px;align-items:center}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:40px;padding:0 16px;border-radius:10px;font-size:14px;font-weight:500;text-decoration:none;border:1px solid var(--border-2);background:rgba(255,255,255,.03);color:var(--text);cursor:pointer;transition:background .15s,border-color .15s,transform .15s,box-shadow .2s;white-space:nowrap}
.btn:hover{background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.22)}
.btn.primary{background:var(--text);color:#0A0B10;border-color:transparent;box-shadow:0 0 0 1px rgba(255,255,255,.1),0 8px 24px -8px rgba(124,156,255,.55)}
.btn.primary:hover{background:#fff;transform:translateY(-1px)}
.btn.sm{height:34px;padding:0 12px;font-size:13px;border-radius:9px}
.btn[disabled]{opacity:.6;cursor:progress}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--border)}
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(60% 55% at 78% 30%, rgba(124,156,255,.22), transparent 70%),
    radial-gradient(45% 45% at 95% 85%, rgba(94,234,212,.14), transparent 70%),
    radial-gradient(40% 40% at 10% 0%, rgba(182,156,255,.10), transparent 70%)}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:44px 44px;-webkit-mask-image:radial-gradient(70% 70% at 60% 40%,#000 30%,transparent 80%);mask-image:radial-gradient(70% 70% at 60% 40%,#000 30%,transparent 80%)}
.hero .wrap{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:48px;align-items:center;padding-block:84px 72px}
.pill{display:inline-flex;align-items:center;gap:10px;padding:5px 12px 5px 6px;border-radius:999px;border:1px solid var(--border-2);background:rgba(255,255,255,.03);font-size:13px;color:var(--text-2);text-decoration:none}
.pill b{font-weight:500;color:var(--accent-ink);background:var(--accent-2);border-radius:999px;padding:2px 8px;font-size:11.5px}
.pill:hover{border-color:rgba(255,255,255,.25);color:var(--text)}
.hero h1{font-size:clamp(38px,5.4vw,66px);line-height:1.02;margin-top:22px;font-weight:600}
.hero h1 .serif{font-family:var(--serif);font-style:italic;font-weight:400;letter-spacing:-.01em;background:linear-gradient(100deg,var(--accent) 10%,var(--accent-2) 90%);-webkit-background-clip:text;background-clip:text;color:transparent;padding-right:.06em}
.hero .lede{font-size:clamp(16px,1.6vw,18.5px);color:var(--text-2);max-width:54ch;margin:22px 0 0;line-height:1.65}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:32px}
.hero .cta .btn{height:46px;padding:0 20px;font-size:15px}
.trust{display:flex;gap:28px;flex-wrap:wrap;margin-top:44px;padding-top:24px;border-top:1px solid var(--border)}
.trust div{min-width:0}
.trust b{display:block;font-size:26px;font-weight:600;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.trust span{font-size:13px;color:var(--text-3)}

/* fanned stack of covers */
.stack{position:relative;height:460px;perspective:1400px}
.stack .bk{position:absolute;top:50%;left:50%;width:250px;aspect-ratio:210/297;border-radius:10px;overflow:hidden;background:#fff;
  box-shadow:0 30px 60px -20px rgba(0,0,0,.8),0 0 0 1px rgba(255,255,255,.08);transform-origin:50% 100%;transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.stack .bk img{width:100%;height:100%;object-fit:cover;object-position:top;display:block}
.stack .bk:nth-child(1){transform:translate(-50%,-50%) translateX(-120px) rotate(-11deg) scale(.88);filter:brightness(.7)}
.stack .bk:nth-child(2){transform:translate(-50%,-50%) translateX(110px) rotate(9deg) scale(.9);filter:brightness(.78)}
.stack .bk:nth-child(3){transform:translate(-50%,-50%) translateY(-6px);z-index:2}
.stack:hover .bk:nth-child(1){transform:translate(-50%,-50%) translateX(-150px) rotate(-14deg) scale(.88)}
.stack:hover .bk:nth-child(2){transform:translate(-50%,-50%) translateX(140px) rotate(12deg) scale(.9)}
.stack:hover .bk:nth-child(3){transform:translate(-50%,-50%) translateY(-16px)}
.chip{position:absolute;z-index:3;display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:12px;background:rgba(18,21,28,.82);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--border-2);font-size:13px;box-shadow:0 16px 40px -12px rgba(0,0,0,.7)}
.chip small{display:block;color:var(--text-3);font-size:11.5px}
.chip .dot{width:30px;height:30px;border-radius:8px;display:grid;place-items:center}
.chip.c1{left:0;bottom:56px}
.chip.c1 .dot{background:rgba(94,234,212,.14);color:var(--accent-2)}
.chip.c2{right:0;top:44px}
.chip.c2 .dot{background:rgba(182,156,255,.14);color:var(--violet)}

/* ---------- coverage strip ---------- */
.coverage{border-bottom:1px solid var(--border);background:var(--bg-2)}
.coverage .wrap{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0}
.lv{padding:26px 24px;border-right:1px solid var(--border);text-decoration:none;display:block;transition:background .15s;min-width:0}
.lv:first-child{border-left:1px solid var(--border)}
.lv:hover{background:rgba(255,255,255,.025)}
.lv .top{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.lv b{font-size:15px;font-weight:600}
.lv .n{font-family:var(--mono);font-size:12px;color:var(--text-3)}
.lv p{margin:4px 0 14px;font-size:13px;color:var(--text-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bar{height:4px;border-radius:4px;background:rgba(255,255,255,.07);overflow:hidden}
.bar span{display:block;height:100%;border-radius:4px;background:linear-gradient(90deg,var(--accent),var(--accent-2))}

/* ---------- sections ---------- */
section.block{padding-block:96px}
.head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;margin-bottom:36px}
.head h2{font-size:clamp(30px,3.8vw,44px);line-height:1.08;margin-top:14px}
.head h2 .serif{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--text-2)}
.head p{color:var(--text-2);max-width:50ch;margin:14px 0 0;font-size:16px}

/* toolbar */
.toolbar{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin-bottom:28px;padding:8px;border:1px solid var(--border);border-radius:14px;background:var(--bg-2)}
.seg{display:flex;gap:2px;flex-wrap:wrap}
.seg button{border:0;background:transparent;color:var(--text-2);height:36px;padding:0 14px;border-radius:9px;font-size:14px;font-weight:500;cursor:pointer;display:inline-flex;align-items:center;gap:8px;transition:background .15s,color .15s}
.seg button:hover{color:var(--text)}
.seg button[aria-selected="true"]{background:var(--surface-2);color:var(--text);box-shadow:inset 0 0 0 1px var(--border-2)}
.seg button .ct{font-family:var(--mono);font-size:11px;color:var(--text-3)}
.search{position:relative;flex:1;max-width:340px;min-width:200px}
.search .ico{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-3)}
.search input{width:100%;height:36px;border-radius:9px;border:1px solid var(--border);background:var(--surface);color:var(--text);padding:0 12px 0 36px;font:inherit;font-size:14px}
.search input::placeholder{color:var(--text-3)}
.search input:focus{outline:none;border-color:rgba(124,156,255,.6);box-shadow:0 0 0 3px rgba(124,156,255,.18)}
.status{font-size:13.5px;color:var(--text-3);margin:-10px 0 22px}

/* cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:18px}
.card{position:relative;display:flex;flex-direction:column;border-radius:var(--r);background:linear-gradient(180deg,var(--surface),var(--bg-2));border:1px solid var(--border);overflow:hidden;min-width:0;transition:transform .25s cubic-bezier(.2,.8,.2,1),border-color .25s,box-shadow .25s}
.card::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;opacity:0;transition:opacity .25s;
  background:radial-gradient(420px circle at var(--mx,50%) var(--my,0%),rgba(124,156,255,.13),transparent 45%)}
.card:hover{transform:translateY(-4px);border-color:rgba(124,156,255,.35);box-shadow:0 24px 50px -24px rgba(0,0,0,.9),0 0 0 1px rgba(124,156,255,.12)}
.card:hover::before{opacity:1}
.thumb{position:relative;aspect-ratio:16/10;max-width:100%;overflow:hidden;background:#0c0e13;border-bottom:1px solid var(--border)}
.thumb img{position:absolute;left:50%;top:14px;width:78%;transform:translateX(-50%);border-radius:6px 6px 0 0;box-shadow:0 10px 30px -8px rgba(0,0,0,.8);transition:transform .45s cubic-bezier(.2,.8,.2,1)}
.card:hover .thumb img{transform:translateX(-50%) translateY(-6px) scale(1.03)}
.thumb::after{content:"";position:absolute;inset:auto 0 0 0;height:45%;background:linear-gradient(transparent,rgba(13,15,20,.95))}
.thumb .glow{position:absolute;inset:0;background:radial-gradient(70% 60% at 50% 0%,var(--tint,rgba(124,156,255,.25)),transparent 70%)}
.badge{position:absolute;z-index:2;top:12px;left:12px;font-family:var(--mono);font-size:11px;letter-spacing:.02em;padding:4px 8px;border-radius:7px;background:rgba(8,9,12,.75);border:1px solid var(--border-2);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.badge.f{left:auto;right:12px;color:var(--violet);border-color:rgba(182,156,255,.35)}
.body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:6px;flex:1}
.body h3{font-size:17px;letter-spacing:-.015em}
.body .fr{font-family:var(--serif);font-style:italic;font-size:16px;color:var(--text-2);line-height:1.3}
.body .tp{font-size:13px;color:var(--text-3);line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-top:2px}
.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;margin-top:12px;border-radius:10px;overflow:hidden;background:var(--border);border:1px solid var(--border)}
.stats div{background:var(--bg-2);padding:8px 10px;min-width:0}
.stats b{display:block;font-size:15px;font-weight:600;font-variant-numeric:tabular-nums}
.stats span{font-size:10.5px;white-space:nowrap;color:var(--text-3);text-transform:uppercase;letter-spacing:.05em;font-family:var(--mono)}
.foot{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:14px}
.ftype{display:inline-flex;align-items:center;gap:7px;font-size:12px;color:var(--text-3);white-space:nowrap}
.ftype .pdf{font-family:var(--mono);font-size:10px;font-weight:500;color:#FFB4A8;background:rgba(255,120,100,.12);border:1px solid rgba(255,120,100,.25);border-radius:5px;padding:2px 5px}
.foot .acts{display:flex;gap:6px}
.card .btn.dl{background:var(--text);color:#0A0B10;border-color:transparent}
.card .btn.dl:hover{background:#fff}

.empty{border:1px dashed var(--border-2);border-radius:var(--r);padding:36px;text-align:center;color:var(--text-2)}

/* roadmap list for upcoming levels */
.road{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:12px}
.ri{display:flex;gap:14px;align-items:flex-start;padding:16px 18px;border-radius:12px;border:1px solid var(--border);background:var(--bg-2);min-width:0}
.ri .c{font-family:var(--mono);font-size:11.5px;color:var(--text-3);padding-top:2px;flex:none;width:66px}
.ri b{display:block;font-size:14.5px;font-weight:600}
.ri span{display:block;font-size:13px;color:var(--text-3);line-height:1.5;margin-top:2px}
.soon{display:inline-block;margin-left:8px;font-family:var(--mono);font-size:10.5px;font-weight:400;color:var(--warm);border:1px solid rgba(245,184,92,.3);background:rgba(245,184,92,.08);border-radius:5px;padding:1px 6px;vertical-align:2px}

/* ---------- bento ---------- */
.bento{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:16px}
.tile{position:relative;border-radius:var(--r);border:1px solid var(--border);background:linear-gradient(180deg,var(--surface),var(--bg-2));padding:26px;overflow:hidden;min-width:0}
.tile h3{font-size:18px;margin-top:16px}
.tile p{color:var(--text-2);margin:8px 0 0;font-size:14.5px}
.tile .num{font-family:var(--serif);font-style:italic;font-size:44px;line-height:1;color:var(--text-3)}
.t-a{grid-column:span 3}.t-b{grid-column:span 3}.t-c{grid-column:span 2}.t-d{grid-column:span 2}.t-e{grid-column:span 2}
.sample{margin-top:20px;border-radius:10px;border:1px solid var(--border);background:var(--bg);padding:16px 18px;font-size:14px}
.sample .lbl{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.06em}
.sample.fr .lbl{color:var(--accent)}
.sample.kr .lbl{color:var(--violet)}
.sample p{margin:6px 0 0;color:var(--text)}
.sample.fr p{font-family:var(--serif);font-size:17px;line-height:1.45}
.stars{font-family:var(--mono);color:var(--warm);letter-spacing:.1em}
.lvls{display:flex;flex-direction:column;gap:8px;margin-top:16px}
.lvls div{display:flex;justify-content:space-between;align-items:center;font-size:13.5px;color:var(--text-2);padding:8px 12px;border-radius:8px;background:var(--bg);border:1px solid var(--border)}

/* ---------- CTA + footer ---------- */
.final{position:relative;border-radius:20px;border:1px solid var(--border-2);overflow:hidden;padding:64px 48px;text-align:left;
  background:radial-gradient(80% 120% at 100% 0%,rgba(124,156,255,.22),transparent 60%),radial-gradient(60% 100% at 0% 100%,rgba(94,234,212,.12),transparent 60%),var(--surface)}
.final h2{font-size:clamp(28px,3.6vw,42px);max-width:20ch}
.final p{color:var(--text-2);max-width:56ch;margin:14px 0 26px;font-size:16px}
.final .cta{display:flex;gap:12px;flex-wrap:wrap}
footer{border-top:1px solid var(--border);padding-block:40px;margin-top:96px;color:var(--text-3);font-size:13.5px}
footer .wrap{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
footer p{margin:0;max-width:66ch}

.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);z-index:30;background:var(--surface-2);border:1px solid var(--border-2);color:var(--text);font-size:14px;padding:11px 16px;border-radius:10px;box-shadow:0 20px 40px -12px rgba(0,0,0,.8);max-width:calc(100% - 32px)}

@media (prefers-reduced-motion:reduce){*{transition:none!important}html{scroll-behavior:auto}}
@media (max-width:980px){
  .hero .wrap{grid-template-columns:1fr;padding-block:56px 56px;gap:24px}
  .stack{height:380px}
  .stack .bk{width:210px}
  .coverage .wrap{grid-template-columns:repeat(2,minmax(0,1fr))}
  .lv:nth-child(3){border-left:1px solid var(--border)}
  .lv:nth-child(-n+2){border-bottom:1px solid var(--border)}
  .t-a,.t-b{grid-column:span 6}.t-c,.t-d,.t-e{grid-column:span 6}
  .nav nav{display:none}
}
@media (max-width:560px){
  .wrap{padding-inline:16px}
  .nav .right .btn:not(.primary){display:none}
  .stack{height:320px}
  .stack .bk{width:168px}
  .stack .bk:nth-child(1){transform:translate(-50%,-50%) translateX(-78px) rotate(-10deg) scale(.88)}
  .stack .bk:nth-child(2){transform:translate(-50%,-50%) translateX(74px) rotate(9deg) scale(.9)}
  .chip.c2{display:none}
  .trust{gap:20px}
  .coverage .wrap{grid-template-columns:1fr}
  .lv{border-left:1px solid var(--border);border-bottom:1px solid var(--border)}
  .search{max-width:none}
  section.block{padding-block:64px}
  .final{padding:40px 24px}
  .road{grid-template-columns:1fr}
}

/* ---------- app shell: views ---------- */
.view[hidden],.pop[hidden],[hidden]{display:none!important}
.nav nav a[aria-current="page"]{color:var(--text);background:rgba(255,255,255,.06)}
.tabbar{display:none}
.lp{display:none}
.kbar{display:flex;align-items:center;gap:10px}

/* resume banner */
.resume{display:flex;align-items:center;gap:14px;margin-top:22px;padding:10px 12px 10px 14px;border-radius:12px;border:1px solid var(--border-2);background:rgba(18,21,28,.7);max-width:520px;text-decoration:none}
.resume:hover{border-color:rgba(124,156,255,.4)}
.resume .rbar{flex:1;min-width:0}
.resume small{display:block;color:var(--text-3);font-size:12px}
.resume b{font-weight:500;font-size:14px;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mini{height:3px;border-radius:3px;background:rgba(255,255,255,.08);overflow:hidden;margin-top:6px}
.mini span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-2))}
.card .mini{margin-top:10px}
.card .prog{display:flex;justify-content:space-between;font-size:11.5px;color:var(--text-3);margin-top:10px;font-family:var(--mono)}
.card .prog + .mini{margin-top:5px}

/* ---------- reader ---------- */
.rbar-top{position:sticky;top:calc(62px + env(safe-area-inset-top,0px));z-index:15;background:rgba(8,9,12,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.rbar-top .wrap{display:flex;align-items:center;gap:10px;height:54px;max-width:1320px}
.rbar-top .ttl{flex:1;min-width:0;display:flex;align-items:baseline;gap:10px}
.rbar-top .ttl .mono{font-size:12px;color:var(--text-3);flex:none}
.rbar-top .ttl b{font-weight:600;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rprog{position:absolute;left:0;bottom:-1px;height:2px;background:linear-gradient(90deg,var(--accent),var(--accent-2));width:0;transition:width .2s}
.ib{width:36px;height:36px;padding:0;border-radius:9px}
.ib .ico{width:18px;height:18px}
.krseg{display:flex;padding:3px;border-radius:10px;border:1px solid var(--border);background:var(--bg-2)}
.krseg button{border:0;background:transparent;color:var(--text-2);height:28px;padding:0 10px;border-radius:7px;font-size:12.5px;font-weight:500;cursor:pointer;white-space:nowrap}
.krseg button[aria-pressed="true"]{background:rgba(182,156,255,.16);color:#D9CCFF;box-shadow:inset 0 0 0 1px rgba(182,156,255,.35)}

.rlayout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:48px;max-width:1320px;margin:0 auto;padding:32px 24px 80px}
.toc{position:sticky;top:140px;align-self:start;max-height:calc(100vh - 160px);overflow:auto;padding-right:6px;font-size:13.5px;overscroll-behavior:contain}
.toc .th{font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--text-3);margin:0 0 10px}
.toc a{display:block;text-decoration:none;color:var(--text-3);padding:5px 10px;border-left:1px solid var(--border);line-height:1.4;transition:color .15s,border-color .15s}
.toc a.h2{color:var(--text-2);font-weight:500;margin-top:10px}
.toc a.h3{padding-left:20px}
.toc a:hover{color:var(--text)}
.toc a.on{color:var(--text);border-left-color:var(--accent-2);background:linear-gradient(90deg,rgba(94,234,212,.08),transparent)}
.toc math{font-size:.95em}
.toc .lvl{display:none}
.scrim{display:none}

/* the document */
.doc{--ink:#E6E8EF;--ink-2:#AEB5C4;--rule:rgba(255,255,255,.1);--fs:17px;
  --c-def:#7C9CFF;--c-thm:#5EEAD4;--c-warn:#F5B85C;--c-kr:#B69CFF;--c-ans:#7FE3B5;
  --bx:rgba(255,255,255,.025);
  max-width:780px;color:var(--ink);font-family:"Source Serif 4",var(--serif);font-size:var(--fs);line-height:1.7;min-width:0}
.doc.paper{--ink:#1d1f24;--ink-2:#545b69;--rule:rgba(0,0,0,.12);--c-def:#2C4FBF;--c-thm:#1F7A5C;--c-warn:#A1620A;--c-kr:#6A3D8F;--c-ans:#1F7A3A;--bx:rgba(0,0,0,.025);
  background:#FBFAF6;border-radius:16px;padding:40px 44px;box-shadow:0 30px 80px -40px rgba(0,0,0,.9)}
.doc p{margin:.55em 0}
.doc .tag{display:inline-block;font-family:var(--mono);font-size:11.5px;letter-spacing:.03em;color:var(--ink-2);border:1px solid var(--rule);border-radius:7px;padding:3px 9px}
.doc h1{font-family:var(--sans);font-size:clamp(32px,4.6vw,48px);letter-spacing:-.03em;line-height:1.05;margin:16px 0 10px;color:var(--ink)}
.doc .sub{font-family:var(--sans);color:var(--ink-2);font-size:15px;line-height:1.55;margin-bottom:22px}
.doc h2{font-family:var(--sans);font-size:clamp(24px,3vw,30px);letter-spacing:-.025em;margin:64px 0 18px;padding-top:22px;border-top:1px solid var(--rule);color:var(--ink)}
.doc h3{font-family:var(--sans);font-size:20px;letter-spacing:-.015em;margin:44px 0 12px;color:var(--ink)}
.doc h4{font-family:var(--sans);font-size:16px;margin:26px 0 8px;color:var(--ink)}
.doc h2,.doc h3,.doc h4,.doc .exo,.doc .kr{scroll-margin-top:136px}
.doc ul,.doc ol{padding-left:1.4em;margin:.5em 0}
.doc li{margin:.2em 0}
.doc .lbl{font-family:var(--sans);font-weight:600;font-size:13px;letter-spacing:.01em;margin-right:6px}
.doc .small{font-size:.9em}
.doc .sans{font-family:var(--sans)}
.doc .two{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.doc .two > .box{margin:0}
.doc .box{position:relative;border:1px solid var(--rule);border-left:3px solid var(--c-def);background:var(--bx);border-radius:4px 12px 12px 4px;padding:14px 18px;margin:18px 0}
.doc .box > .lbl:first-child{display:block;color:var(--c-def);margin-bottom:4px}
.doc .box.thm{border-left-color:var(--c-thm)}
.doc .box.thm > .lbl{color:var(--c-thm)}
.doc .box.warn{border-left-color:var(--c-warn)}
.doc .box.warn > .lbl{color:var(--c-warn)}
.doc .proof{border-left:1px dashed var(--rule);padding:2px 0 2px 16px;margin:8px 0 18px;color:var(--ink)}
.doc .proof > .lbl{color:var(--ink-2);font-style:italic;font-weight:500}
.doc .qed{float:right;color:var(--ink-2)}
.doc .ex{border:1px dashed var(--rule);border-radius:12px;padding:14px 18px;margin:18px 0}
.doc .ex > .lbl{color:var(--c-def)}
.doc .sol{margin-top:8px;padding-top:8px;border-top:1px solid var(--rule)}
.doc .sol > .lbl{color:var(--c-thm)}
.doc .ans{color:var(--c-ans);font-weight:600}
.doc .lvl{font-family:var(--mono);font-size:12px;color:var(--c-warn);letter-spacing:.06em}
.doc .num{font-family:var(--sans);font-weight:600;color:var(--ink)}
.doc table.t{border-collapse:collapse;margin:14px 0;font-size:.92em;width:100%;display:block;overflow-x:auto}
.doc table.t th,.doc table.t td{border:1px solid var(--rule);padding:6px 10px;text-align:left;vertical-align:top}
.doc table.t th{font-family:var(--sans);font-size:13px;background:var(--bx)}
.doc .fig{margin:18px 0;text-align:center}
.doc .fig svg{background:#fff;border-radius:10px;padding:10px;max-width:100%;height:auto}
.doc .fig .cap{font-family:var(--sans);font-size:13px;color:var(--ink-2);margin-top:6px}
.doc math{font-family:"STIX Two Math","Cambria Math","Latin Modern Math","Noto Sans Math",math;font-size:1.05em}
.doc math[display="block"]{display:block math;margin:.6em 0;overflow-x:auto;overflow-y:hidden;padding:2px 0}
.doc .mx{overflow-x:auto;overflow-y:hidden;margin:.6em 0;padding:2px 0}
.doc .mx > math{margin:0}
.doc .mxi{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle}
.rlayout{overflow-x:clip}
.doc menclose[notation="box"]{border:1px solid currentColor;padding:2px 4px}
.doc mtd{padding:2px 4px}

/* Creole boxes: collapsible */
.doc .kr{border:1px solid color-mix(in srgb,var(--c-kr) 35%,transparent);background:color-mix(in srgb,var(--c-kr) 8%,transparent);border-radius:14px;margin:20px 0;font-family:var(--sans);font-size:calc(var(--fs) - 1.5px);line-height:1.65;overflow:hidden}
.doc .kr .krh{all:unset;box-sizing:border-box;display:flex;align-items:center;gap:10px;width:100%;padding:11px 16px;cursor:pointer;color:var(--c-kr);font-weight:600;font-size:13.5px}
.doc .kr .krh:focus-visible{outline:2px solid var(--c-kr);outline-offset:-2px;border-radius:14px}
.doc .kr .krh .kf{font-family:var(--mono);font-size:10.5px;font-weight:500;border:1px solid currentColor;border-radius:5px;padding:1px 5px;opacity:.85}
.doc .kr .krh .lb{flex:1}
.doc .kr .krh .ch{transition:transform .2s}
.doc .kr .krb{padding:0 18px 14px}
.doc .kr .krb > .lbl:first-child{display:none}
.doc .kr.closed .krb{display:none}
.doc .kr.closed .krh .ch{transform:rotate(-90deg)}
.doc .kr.closed .krh::after{content:"Klike pou li";font-weight:400;font-size:12px;color:var(--ink-2)}

/* training mode: hide example solutions */
.doc .solbtn{display:none}
.doc.train .ex:not(.rev) .sol{display:none}
.doc.train .ex:not(.rev) .solbtn{display:inline-flex;margin-top:10px}

/* exercise actions */
.doc .exo{position:relative;padding:14px 18px 12px;margin:14px 0;border-radius:12px;border:1px solid var(--rule);background:var(--bx)}
.doc .exo.ok{border-color:color-mix(in srgb,var(--c-ans) 50%,transparent)}
.doc .exo.hard{border-color:color-mix(in srgb,var(--c-warn) 55%,transparent)}
.xa{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px;font-family:var(--sans)}
.xb{display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 11px;border-radius:8px;border:1px solid var(--rule);background:transparent;color:var(--ink-2);font:500 12.5px var(--sans);cursor:pointer;transition:background .15s,color .15s,border-color .15s}
.xb:hover{color:var(--ink);border-color:color-mix(in srgb,var(--ink) 30%,transparent)}
.xb .ico{width:14px;height:14px}
.xb[aria-pressed="true"].k-ok{color:var(--c-ans);border-color:color-mix(in srgb,var(--c-ans) 60%,transparent);background:color-mix(in srgb,var(--c-ans) 10%,transparent)}
.xb[aria-pressed="true"].k-hard{color:var(--c-warn);border-color:color-mix(in srgb,var(--c-warn) 60%,transparent);background:color-mix(in srgb,var(--c-warn) 10%,transparent)}
.xb[aria-expanded="true"]{color:var(--ink);background:color-mix(in srgb,var(--ink) 6%,transparent)}
.xc{margin-top:12px;padding:12px 16px;border-radius:10px;border:1px solid color-mix(in srgb,var(--c-thm) 35%,transparent);background:color-mix(in srgb,var(--c-thm) 6%,transparent);font-size:.96em}
.xc .xch{font-family:var(--sans);font-size:12px;font-weight:600;color:var(--c-thm);letter-spacing:.02em;text-transform:uppercase}

.endcard{margin-top:56px;border-radius:16px;border:1px solid var(--border-2);padding:28px;background:radial-gradient(80% 140% at 100% 0%,rgba(124,156,255,.16),transparent 60%),var(--surface);font-family:var(--sans);color:var(--text)}
.endcard h3{font-size:22px;margin:0 0 6px}
.endcard p{color:var(--text-2);margin:0 0 18px}
.endcard .cta{display:flex;gap:10px;flex-wrap:wrap}
.rnav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}
.rnav a{display:block;text-decoration:none;border:1px solid var(--border);border-radius:12px;padding:14px 16px;background:var(--bg-2);min-width:0}
.rnav a:hover{border-color:rgba(124,156,255,.35)}
.rnav small{display:block;font-family:var(--mono);font-size:11px;color:var(--text-3)}
.rnav b{display:block;font-size:15px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rnav a:last-child{text-align:right}

.skel{display:flex;flex-direction:column;gap:14px;padding-top:12px}
.skel i{display:block;height:16px;border-radius:6px;background:linear-gradient(90deg,rgba(255,255,255,.04),rgba(255,255,255,.09),rgba(255,255,255,.04));background-size:200% 100%;animation:sk 1.2s infinite}
@keyframes sk{to{background-position:-200% 0}}

/* settings popover */
.pop{position:absolute;right:16px;top:58px;z-index:40;width:300px;max-width:calc(100vw - 32px);border-radius:14px;border:1px solid var(--border-2);background:var(--surface-2);box-shadow:0 30px 60px -20px rgba(0,0,0,.9);padding:14px;display:flex;flex-direction:column;gap:12px;font-size:13.5px}
.pop .row{display:flex;align-items:center;justify-content:space-between;gap:10px}
.pop .row > span{color:var(--text-2)}
.pop .row small{display:block;color:var(--text-3);font-size:12px}
.sw{position:relative;width:40px;height:24px;border-radius:999px;border:1px solid var(--border-2);background:var(--bg);cursor:pointer;flex:none;padding:0}
.sw::after{content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:var(--text-3);transition:transform .2s,background .2s}
.sw[aria-checked="true"]{background:rgba(94,234,212,.2);border-color:rgba(94,234,212,.5)}
.sw[aria-checked="true"]::after{transform:translateX(16px);background:var(--accent-2)}
.fsz{display:flex;gap:4px}
.fsz button{width:36px;height:30px;border-radius:8px;border:1px solid var(--border-2);background:var(--bg);color:var(--text);cursor:pointer;font-weight:600}

/* ---------- generic page heads (dashboard, teachers, pricing) ---------- */
.phead{position:relative;overflow:hidden;border-bottom:1px solid var(--border)}
.phead::before{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(50% 80% at 85% 0%,rgba(124,156,255,.18),transparent 70%),radial-gradient(40% 70% at 0% 100%,rgba(94,234,212,.08),transparent 70%)}
.phead .wrap{position:relative;padding-block:56px 44px}
.phead h1{font-size:clamp(32px,4.4vw,52px);line-height:1.05;margin-top:16px}
.phead h1 .serif{font-family:var(--serif);font-style:italic;font-weight:400;color:var(--text-2)}
.phead p.lede{color:var(--text-2);max-width:60ch;margin:16px 0 0;font-size:17px}
.note{font-size:13px;color:var(--text-3);display:flex;gap:8px;align-items:flex-start;margin-top:18px}
.note .ico{margin-top:3px;color:var(--accent-2)}

/* dashboard */
.dgrid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:16px;padding-block:36px 24px}
.panel{border-radius:var(--r);border:1px solid var(--border);background:linear-gradient(180deg,var(--surface),var(--bg-2));padding:22px;min-width:0}
.panel h2{font-size:16px;font-weight:600;letter-spacing:-.01em;display:flex;align-items:center;justify-content:space-between;gap:10px}
.panel h2 small{font-family:var(--mono);font-size:11.5px;color:var(--text-3);font-weight:400}
.p-score{grid-column:span 5;display:flex;gap:22px;align-items:center}
.p-kpi{grid-column:span 7;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--border);padding:0;overflow:hidden}
.p-kpi > div{background:var(--bg-2);padding:18px 20px;min-width:0}
.p-kpi b{display:block;font-size:30px;font-weight:600;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.p-kpi span{font-size:13px;color:var(--text-3)}
.p-ch{grid-column:span 8}
.p-side{grid-column:span 4;display:flex;flex-direction:column;gap:16px}
.ring{position:relative;width:140px;height:140px;flex:none}
.ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring .v{position:absolute;inset:0;display:grid;place-items:center;text-align:center}
.ring .v b{font-size:36px;font-weight:600;letter-spacing:-.03em;line-height:1}
.ring .v small{display:block;font-size:11px;color:var(--text-3);font-family:var(--mono);margin-top:4px}
.p-score h2{font-size:20px;display:block}
.p-score p{color:var(--text-2);font-size:14px;margin:8px 0 0}
.legend{display:flex;flex-direction:column;gap:6px;margin-top:12px;font-size:12.5px;color:var(--text-3)}
.legend span{display:flex;align-items:center;gap:8px}
.legend i{width:8px;height:8px;border-radius:2px;flex:none}
.chl{display:flex;flex-direction:column;margin-top:14px}
.chr{display:grid;grid-template-columns:72px minmax(0,1fr) 120px 88px;gap:14px;align-items:center;padding:11px 0;border-top:1px solid var(--border);font-size:14px}
.chr .c{font-family:var(--mono);font-size:11.5px;color:var(--text-3)}
.chr .n{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chr .n small{display:block;color:var(--text-3);font-size:12px}
.chr .st{font-size:12px;color:var(--text-3);font-family:var(--mono);text-align:right;white-space:nowrap}
.chr .st.done{color:var(--accent-2)}
.chr .btn{justify-self:end}
.list{display:flex;flex-direction:column;gap:6px;margin-top:12px}
.li{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;border:1px solid var(--border);background:var(--bg);text-decoration:none;font-size:13.5px;min-width:0}
.li:hover{border-color:var(--border-2)}
.li .c{font-family:var(--mono);font-size:11px;color:var(--text-3);flex:none}
.li .t{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.li .d{width:8px;height:8px;border-radius:50%;flex:none}
.emptyx{font-size:13.5px;color:var(--text-3);padding:14px;border:1px dashed var(--border-2);border-radius:10px;margin-top:12px}
.badges{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:12px}
.bdg{border-radius:12px;border:1px solid var(--border);background:var(--bg);padding:12px 8px;text-align:center;font-size:12px;color:var(--text-3);min-width:0}
.bdg .e{font-size:22px;display:block;filter:grayscale(1);opacity:.35}
.bdg.on{border-color:rgba(245,184,92,.4);color:var(--text);background:linear-gradient(180deg,rgba(245,184,92,.08),var(--bg))}
.bdg.on .e{filter:none;opacity:1}
.soonp{border-radius:var(--r);border:1px dashed var(--border-2);padding:18px 20px;display:flex;gap:14px;align-items:flex-start}
.soonp b{display:block;font-size:14.5px}
.soonp span{font-size:13px;color:var(--text-3)}
.mode{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;color:var(--text-3);border:1px solid var(--border);border-radius:999px;padding:4px 10px}
.mode i{width:7px;height:7px;border-radius:50%;background:var(--warm)}
.mode.db i{background:var(--accent-2);box-shadow:0 0 10px var(--accent-2)}

/* teachers */
.feat{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;padding-block:36px 8px}
.feat .tile{padding:22px}
.feat .tile h3{font-size:16px;margin-top:12px}
.feat .tile p{font-size:13.5px}
.fic{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:rgba(124,156,255,.12);color:var(--accent)}
.fic .ico{width:18px;height:18px}
.composer{display:grid;grid-template-columns:340px minmax(0,1fr);gap:18px;align-items:start;margin-top:28px}
.cform{position:sticky;top:80px;display:flex;flex-direction:column;gap:18px}
.fl{display:flex;flex-direction:column;gap:8px}
.fl > span{font-size:12px;font-family:var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--text-3)}
.fl input[type=text]{width:100%;min-width:0;height:38px;border-radius:9px;border:1px solid var(--border);background:var(--bg);color:var(--text);padding:0 12px;font:inherit;font-size:14px}
.fl input[type=text]:focus{outline:none;border-color:rgba(124,156,255,.6)}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chips button{height:30px;padding:0 10px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text-2);font:500 12.5px var(--sans);cursor:pointer}
.chips button[aria-pressed="true"]{color:var(--text);border-color:rgba(124,156,255,.55);background:rgba(124,156,255,.12)}
.chips button .mono{font-size:11px;color:var(--text-3);margin-right:4px}
.sheet{min-width:0;overflow-x:clip;border-radius:14px;background:#FBFAF6;color:#1d1f24;padding:36px 40px;min-height:420px;box-shadow:0 30px 80px -40px rgba(0,0,0,.9)}
.sheet .doc{max-width:none;--fs:15.5px}
.sheet h2.sh{font-family:var(--sans);font-size:22px;letter-spacing:-.02em;margin:0;padding:0;border:0;color:#1d1f24}
.sheet .cor h2.sh{margin-bottom:6px}
.sheet .meta{font-family:var(--sans);font-size:13px;color:#545b69;margin:6px 0 18px;padding-bottom:12px;border-bottom:1px solid rgba(0,0,0,.12);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.sheet .q{margin:14px 0;padding:0;border:0;background:none}
.sheet .q .src{font-family:var(--mono);font-size:10.5px;color:#8a8f99;margin-left:8px}
.sheet .q .qn{font-family:var(--sans);font-weight:700}
.sheet .cor{margin-top:28px;padding-top:16px;border-top:2px solid #1d1f24}
.sheet .empty{color:#545b69;border-color:rgba(0,0,0,.2)}
.sheet .q .lvl{color:#A1620A}
.sheetbar{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.sheetbar span{font-size:13px;color:var(--text-3)}

/* pricing */
.billing{display:inline-flex;padding:4px;border-radius:12px;border:1px solid var(--border);background:var(--bg-2);margin-top:26px}
.billing button{border:0;background:transparent;color:var(--text-2);height:34px;padding:0 14px;border-radius:9px;font:500 14px var(--sans);cursor:pointer}
.billing button[aria-pressed="true"]{background:var(--surface-2);color:var(--text);box-shadow:inset 0 0 0 1px var(--border-2)}
.billing em{font-style:normal;font-size:11px;color:var(--accent-2);margin-left:6px}
.plans{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;padding-block:32px 8px;align-items:stretch}
.plan{position:relative;display:flex;flex-direction:column;border-radius:16px;border:1px solid var(--border);background:linear-gradient(180deg,var(--surface),var(--bg-2));padding:24px;min-width:0}
.plan.hot{border-color:rgba(124,156,255,.55);box-shadow:0 0 0 1px rgba(124,156,255,.2),0 30px 60px -30px rgba(124,156,255,.45)}
.plan .tagp{position:absolute;top:-11px;left:22px;font-family:var(--mono);font-size:11px;padding:3px 9px;border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--accent-2));color:var(--accent-ink);font-weight:500}
.plan h3{font-size:16px}
.plan .for{font-size:13px;color:var(--text-3);margin-top:4px;min-height:40px}
.plan .price{margin:18px 0 4px;display:flex;align-items:baseline;gap:6px;flex-wrap:wrap}
.plan .price b{font-size:34px;font-weight:600;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.plan .price span{font-size:13px;color:var(--text-3)}
.plan .usd{font-size:12.5px;color:var(--text-3);min-height:20px}
.plan ul{list-style:none;padding:0;margin:18px 0 22px;display:flex;flex-direction:column;gap:9px;font-size:13.5px;color:var(--text-2);flex:1}
.plan li{display:flex;gap:9px;align-items:flex-start}
.plan li .ico{color:var(--accent-2);margin-top:3px}
.plan li.s{color:var(--text-3)}
.plan li.s .ico{color:var(--text-3)}
.plan li .soon{margin-left:4px}
.plan .btn{width:100%}
.pays{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:18px}
.pay{border-radius:14px;border:1px solid var(--border);background:var(--bg-2);padding:18px;min-width:0}
.pay .pn{display:flex;align-items:center;gap:10px;font-weight:600;font-size:15px}
.pay .pn i{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font-style:normal;font-family:var(--mono);font-size:11px;font-weight:600}
.pay p{font-size:13px;color:var(--text-3);margin:10px 0 12px}
.pay .btn{width:100%}
.faq{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:18px}
.faq details{border-radius:12px;border:1px solid var(--border);background:var(--bg-2);padding:14px 18px}
.faq summary{cursor:pointer;font-weight:500;font-size:14.5px;list-style:none;display:flex;justify-content:space-between;gap:10px}
.faq summary::after{content:"+";color:var(--text-3);font-family:var(--mono)}
.faq details[open] summary::after{content:"–"}
.faq p{color:var(--text-2);font-size:14px;margin:10px 0 0}
.h2s{font-size:clamp(24px,3vw,32px);margin-top:12px}

@media (max-width:1100px){
  .rlayout{grid-template-columns:minmax(0,1fr);padding-top:20px}
  .toc{position:fixed;top:0;left:0;bottom:0;z-index:60;width:min(320px,86vw);max-height:none;background:var(--bg-2);border-right:1px solid var(--border-2);padding:20px 16px calc(80px + env(safe-area-inset-bottom,0px));transform:translateX(-102%);transition:transform .25s cubic-bezier(.2,.8,.2,1)}
  .toc.open{transform:none;box-shadow:30px 0 60px rgba(0,0,0,.6)}
  .scrim{position:fixed;inset:0;z-index:55;background:rgba(0,0,0,.55)}
  .scrim.open{display:block}
  .doc{margin:0 auto}
  .lp{display:inline-flex}
  .composer{grid-template-columns:minmax(0,1fr)}
  .cform{position:static}
  .plans{grid-template-columns:repeat(2,minmax(0,1fr))}
  .feat{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:980px){
  .p-score,.p-kpi,.p-ch,.p-side{grid-column:span 12}
  .pays{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tabbar{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:50;background:rgba(10,11,15,.92);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--border);padding-bottom:env(safe-area-inset-bottom,0px)}
  .tabbar a{display:flex;flex-direction:column;align-items:center;gap:3px;padding:8px 0 7px;text-decoration:none;color:var(--text-3);font-size:11px}
  .tabbar a .ico{width:20px;height:20px}
  .tabbar a[aria-current="page"]{color:var(--text)}
  .tabbar a[aria-current="page"] .ico{color:var(--accent-2)}
  body{padding-bottom:calc(64px + env(safe-area-inset-bottom,0px))}
  .toast{bottom:calc(84px + env(safe-area-inset-bottom,0px))}
  .krseg.desk{display:none}
}
@media (max-width:560px){
  .rlayout{padding:14px 0 60px}
  .doc{padding:0 16px}
  .doc.paper{padding:24px 16px;border-radius:0}
  .doc .two{grid-template-columns:1fr}
  .doc .box,.doc .ex,.doc .exo{padding:12px 14px}
  .doc .kr .krb{padding:0 14px 12px}
  .rbar-top .wrap{gap:6px;padding-inline:10px}
  .rbar-top .ttl .mono{display:none}
  .dl-r{display:none}
  .chr{grid-template-columns:minmax(0,1fr) 84px;row-gap:6px}
  .chr .c{display:none}
  .chr .bar2{grid-column:1 / -1;order:3}
  .chr .btn{grid-row:1;grid-column:2}
  .p-score{flex-direction:column;align-items:flex-start}
  .plans,.pays,.faq,.feat{grid-template-columns:1fr}
  .sheet{padding:22px 16px}
  .rnav{grid-template-columns:1fr}
  .rnav a:last-child{text-align:left}
  .badges{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media print{
  .nav,.tabbar,.rbar-top,.toc,.xa,.endcard,.rnav,footer{display:none!important}
  body{background:#fff;color:#000}
}

/* accounts */
.auth{max-width:440px;margin:0 auto;padding:72px 24px 96px}
.auth h1{font-size:34px;margin-top:14px}
.auth p{color:var(--text-2)}
.auth form{display:flex;flex-direction:column;gap:12px;margin-top:22px}
.auth label{display:block}
.auth input,.auth select{width:100%;height:44px;border-radius:10px;border:1px solid var(--border-2);background:var(--surface);color:var(--text);padding:0 14px;font:inherit}
.auth input:focus,.auth select:focus{outline:none;border-color:rgba(124,156,255,.6);box-shadow:0 0 0 3px rgba(124,156,255,.18)}
.auth .msg{font-size:14px;padding:12px 14px;border-radius:10px;border:1px solid var(--border-2);background:var(--bg-2)}
.auth .msg.err{border-color:rgba(255,120,100,.4);color:#FFB4A8}
.alinks{display:flex;gap:16px;flex-wrap:wrap;margin-top:16px}
.alinks button{border:0;background:none;color:var(--accent);font:inherit;font-size:14px;cursor:pointer;padding:0}
.acct{display:flex;align-items:center;gap:8px}
#acct{display:contents}
.paysel{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.paysel button{height:38px;border-radius:9px;border:1px solid var(--border-2);background:var(--bg);color:var(--text);font:500 13px var(--sans);cursor:pointer}
.paysel button:hover:not([disabled]){border-color:rgba(124,156,255,.55)}
.paysel button[disabled]{opacity:.45;cursor:not-allowed}
.banner{margin:18px 0 0;padding:12px 16px;border-radius:12px;border:1px solid var(--border-2);background:var(--bg-2);font-size:14px;max-width:640px}
.banner.err{border-color:rgba(255,120,100,.4)}