/* ==========================================================
   NGAZI — design system  (v4 · 2026-09-17)
   Bright, colourful and light on the phone. One self-hosted font
   file (Plus Jakarta Sans, SIL Open Font License), no frameworks,
   no external calls. Colour is used as a map: every subject keeps
   one colour family on its cards, progress and paper covers.
   Breakpoints (mobile first): 360 · 390 · 430 · 620 · 760 · 1024
   ========================================================== */

@font-face{
  font-family:"Plus Jakarta Sans";
  font-style:normal;font-weight:400 800;
  font-display:swap;
  src:url("../fonts/plus-jakarta-sans-latin.woff2") format("woff2");
}

:root{
  /* palette */
  --navy:#0B1F3A;
  --emerald:#10B981; --emerald-ink:#047857; --emerald-deep:#065F46;
  --sky:#38BDF8;     --sky-ink:#0369A1;
  --yellow:#FACC15;  --yellow-ink:#A16207;
  --coral:#FB7185;   --coral-ink:#BE123C;
  --purple:#8B5CF6;  --purple-ink:#6D28D9;
  --mint:#D1FAE5; --soft-blue:#E0F2FE; --soft-yellow:#FEF3C7; --soft-pink:#FCE7F3; --soft-purple:#EDE9FE;

  /* surfaces + text */
  --bg:#F8FAFC;
  --bg-2:#FFFFFF;
  --card:#FFFFFF;
  --surface:#FFFFFF;
  --surface-2:#F1F5F9;
  --line:#E2E8F0;
  --line-strong:#CBD5E1;
  --text:#0B1F3A;
  --muted:#475569;
  --faint:#5B6B82;

  /* status (also read by papers.css) */
  --cy:#0369A1;
  --vi:#6D28D9;
  --ok:#047857;
  --warn:#B45309;
  --bad:#BE123C;

  /* shape */
  --r-xs:8px; --r-s:12px; --r-m:16px; --r-l:22px; --r-xl:28px; --r-pill:999px;
  --sh-1:0 1px 2px rgba(11,31,58,.06);
  --sh-2:0 1px 2px rgba(11,31,58,.05),0 8px 20px -12px rgba(11,31,58,.22);
  --shadow:0 24px 50px -26px rgba(11,31,58,.40);
  --ring:0 0 0 3px rgba(56,189,248,.55);

  /* rhythm */
  --pad:clamp(16px,4.5vw,28px);
  --gap:12px;
  --t-fast:.14s; --t-med:.24s;
  --ease:cubic-bezier(.2,.8,.2,1);

  --sat:env(safe-area-inset-top,0px);
  --sab:env(safe-area-inset-bottom,0px);
  --nav-h:68px;
  --font:"Plus Jakarta Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color-scheme:light;
}

/* subject colour families: strong, soft, ink (text-safe), line */
.hue-blue  {--h:#3B82F6;--h-soft:#E0F2FE;--h-ink:#1D4ED8;--h-line:#BAE6FD}
.hue-sky   {--h:#38BDF8;--h-soft:#E0F2FE;--h-ink:#0369A1;--h-line:#BAE6FD}
.hue-green {--h:#10B981;--h-soft:#D1FAE5;--h-ink:#047857;--h-line:#A7F3D0}
.hue-purple{--h:#8B5CF6;--h-soft:#EDE9FE;--h-ink:#6D28D9;--h-line:#DDD6FE}
.hue-coral {--h:#FB7185;--h-soft:#FFE4E6;--h-ink:#BE123C;--h-line:#FECDD3}
.hue-pink  {--h:#EC4899;--h-soft:#FCE7F3;--h-ink:#BE185D;--h-line:#FBCFE8}
.hue-yellow{--h:#FACC15;--h-soft:#FEF3C7;--h-ink:#854D0E;--h-line:#FDE68A}
.hue-orange{--h:#FB923C;--h-soft:#FFEDD5;--h-ink:#C2410C;--h-line:#FED7AA}
.hue-teal  {--h:#14B8A6;--h-soft:#CCFBF1;--h-ink:#0F766E;--h-line:#99F6E4}
.hue-indigo{--h:#6366F1;--h-soft:#E0E7FF;--h-ink:#4338CA;--h-line:#C7D2FE}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(76px + var(--sat))}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font:16px/1.6 var(--font);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  overflow-x:clip;
  min-height:100dvh;
  position:relative;
}
/* A soft wash of colour behind the top of every page. Painted once,
   scrolls away with the page, no blur and no animation. */
body::before{
  content:"";position:absolute;left:0;right:0;top:0;height:520px;z-index:-1;pointer-events:none;
  background:
    radial-gradient(420px 260px at 8% 0%,rgba(209,250,229,.9),transparent 70%),
    radial-gradient(460px 280px at 92% 4%,rgba(224,242,254,.95),transparent 70%),
    radial-gradient(360px 220px at 60% 0%,rgba(254,243,199,.7),transparent 70%);
}

img{max-width:100%;height:auto}
[hidden]{display:none!important}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}
:focus-visible{outline:none;box-shadow:var(--ring);border-radius:10px}

.ic{width:1.25em;height:1.25em;flex:0 0 auto;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;display:block}

.skip{position:absolute;left:-9999px;top:0}
.skip:focus{left:8px;top:calc(8px + var(--sat));z-index:99;background:var(--navy);color:#fff;padding:10px 14px;border-radius:10px}

/* ---------------------------------------------------- header */
.topbar{
  position:sticky;top:0;z-index:40;
  padding-top:var(--sat);
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  max-width:1120px;margin:0 auto;padding:10px var(--pad);
  display:flex;align-items:center;gap:10px;min-height:62px;
}
.brand{display:flex;align-items:center;gap:10px;min-height:44px;text-decoration:none;margin-right:auto;color:var(--navy)}
.brand-mark{display:flex;align-items:flex-end;gap:3px;height:24px;padding:4px;border-radius:9px;background:var(--navy);width:32px;height:32px;justify-content:center}
.brand-mark i{display:block;width:5px;border-radius:2px}
.brand-mark i:nth-child(1){height:8px;background:var(--emerald)}
.brand-mark i:nth-child(2){height:14px;background:var(--sky)}
.brand-mark i:nth-child(3){height:20px;background:var(--yellow)}
.brand-word{font-weight:800;letter-spacing:-.03em;font-size:21px}

.iconbtn{
  width:42px;height:42px;flex:0 0 42px;display:grid;place-items:center;
  background:#fff;border:1px solid var(--line);border-radius:12px;cursor:pointer;color:var(--navy);
  transition:border-color var(--t-fast),background var(--t-fast);
}
.iconbtn:hover{border-color:var(--line-strong);background:var(--surface-2)}
.iconbtn:active{transform:scale(.94)}
.iconbtn svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}

.crumb{
  max-width:1120px;margin:0 auto;padding:0 var(--pad) 9px;
  font-size:13px;color:var(--faint);font-weight:500;
  display:flex;gap:7px;flex-wrap:wrap;align-items:center;
}
.crumb a{text-decoration:none;color:var(--muted)}
.crumb a:hover{color:var(--emerald-ink)}
.crumb b{color:var(--navy);font-weight:700}
.crumb span{opacity:.5}

/* ---------------------------------------------------- navigation
   Bottom bar on phones (thumb reach); inline in the header from 760px. */
.tabs{
  position:fixed;left:0;right:0;bottom:0;z-index:45;
  display:grid;grid-template-columns:repeat(5,minmax(0,1fr));
  padding:6px 6px calc(6px + var(--sab));
  background:rgba(255,255,255,.98);
  border-top:1px solid var(--line);
  box-shadow:0 -6px 20px -14px rgba(11,31,58,.25);
}
.tabs a{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  min-height:54px;border-radius:14px;text-decoration:none;
  font-size:11.5px;font-weight:700;color:var(--faint);
}
.tabs svg{width:24px;height:24px;padding:3px 12px;box-sizing:content-box;border-radius:999px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:background var(--t-fast)}
.tabs a[aria-current="page"]{color:var(--navy)}
.tabs a[aria-current="page"] svg{background:var(--mint);stroke:var(--emerald-ink)}
@media(min-width:760px){
  .tabs{position:static;display:flex;gap:2px;padding:0;background:none;border:none;box-shadow:none;margin-right:4px}
  .tabs a{flex-direction:row;min-height:42px;padding:0 13px;font-size:14.5px;gap:7px;color:var(--muted)}
  .tabs svg{width:18px;height:18px;padding:0;border-radius:0}
  .tabs a:hover{background:var(--surface-2);color:var(--navy)}
  .tabs a[aria-current="page"]{background:var(--mint);color:var(--emerald-deep)}
  .tabs a[aria-current="page"] svg{background:none}
}

/* ---------------------------------------------------- page */
.main{max-width:1120px;margin:0 auto;padding:0 var(--pad) calc(var(--nav-h) + 40px + var(--sab))}
@media(min-width:760px){ .main{padding-bottom:calc(56px + var(--sab))} }
.view{padding-top:20px;max-width:100%}
.main:focus,.main:focus-visible{outline:none;box-shadow:none}

/* ---------------------------------------------------- type */
h1,h2,h3{line-height:1.18;letter-spacing:-.025em;margin:0;color:var(--navy)}
.h-hero{font-size:clamp(34px,9.4vw,58px);font-weight:800;letter-spacing:-.04em;line-height:1.04}
.h-page{font-size:clamp(26px,6.4vw,36px);font-weight:800;letter-spacing:-.035em}
.h-sec{font-size:17px;font-weight:800;letter-spacing:-.02em;color:var(--navy)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 10px;font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--emerald-ink)}
.eyebrow::before{content:"";width:18px;height:6px;border-radius:3px;background:linear-gradient(90deg,var(--emerald) 0 33%,var(--sky) 33% 66%,var(--yellow) 66%)}
.lede{color:var(--muted);font-size:clamp(15.5px,4vw,18px);margin:10px 0 0;max-width:58ch;line-height:1.55}
.tiny{font-size:13.5px;color:var(--faint);line-height:1.55}
.tiny a,.sec-link,.lede a{color:var(--emerald-ink);font-weight:700}
.hl{color:var(--emerald-ink);background:linear-gradient(transparent 70%,var(--soft-yellow) 70%)}
.grad{color:var(--emerald-ink)}

/* ---------------------------------------------------- layout */
.sec{margin-top:30px}
.sec-h{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
.sec>.h-sec{margin-bottom:12px}
.sec-link{font-size:14px;text-decoration:none;white-space:nowrap}
.sec-link:hover{text-decoration:underline}

.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-l);
  padding:18px;position:relative;box-shadow:var(--sh-1);
}
/* minmax(0,1fr), not 1fr: long unbreakable text must never widen a
   track past the viewport on a 320px phone. */
.grid{display:grid;gap:var(--gap);grid-template-columns:minmax(0,1fr)}
@media(min-width:620px){ .grid-2{grid-template-columns:repeat(2,minmax(0,1fr))} }
@media(min-width:720px){ .grid-3{grid-template-columns:repeat(3,minmax(0,1fr))} }

/* horizontal scrollers bleed to the screen edge on phones */
.scroller,.shelf,.toc{
  display:flex;gap:10px;overflow-x:auto;overscroll-behavior-x:contain;
  scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;scrollbar-width:none;
  margin:0 calc(var(--pad) * -1);padding:2px var(--pad) 8px;
}
.scroller::-webkit-scrollbar,.shelf::-webkit-scrollbar,.toc::-webkit-scrollbar{display:none}
.scroller>*,.shelf>*,.toc>*{scroll-snap-align:start;flex:0 0 auto}

/* ---------------------------------------------------- list row */
.row{
  display:flex;align-items:center;gap:14px;width:100%;text-align:left;
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-m);
  padding:14px 16px;cursor:pointer;text-decoration:none;box-shadow:var(--sh-1);
  transition:border-color var(--t-fast),box-shadow var(--t-fast),transform var(--t-fast);
  min-height:68px;min-width:0;
}
.row:hover{border-color:var(--h-line,var(--line-strong));box-shadow:var(--sh-2)}
.row:active{transform:scale(.985)}
.row-ic{
  width:46px;height:46px;flex:0 0 46px;border-radius:14px;display:grid;place-items:center;
  background:var(--h-soft,var(--surface-2));color:var(--h-ink,var(--navy));
  font-size:19px;font-weight:800;
}
.row-ic .ic{width:24px;height:24px}
.row-body{min-width:0;flex:1 1 auto;display:block;overflow:hidden}
.row-t{display:block;font-weight:700;font-size:16px;letter-spacing:-.01em;color:var(--navy);overflow-wrap:anywhere;line-height:1.35}
.row-s{display:block;font-size:13.5px;color:var(--muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row-go{flex:0 0 auto;color:var(--faint);width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--surface-2);transition:background var(--t-fast),color var(--t-fast)}
.row:hover .row-go{background:var(--h-soft,var(--mint));color:var(--h-ink,var(--emerald-ink))}
.row-go svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;display:block}
.row.is-soon{opacity:.55;cursor:default;box-shadow:none}
.row.is-soon:hover{border-color:var(--line)}

/* ---------------------------------------------------- chips */
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  display:inline-flex;align-items:center;gap:5px;
  font-size:12.5px;font-weight:700;padding:5px 11px;border-radius:var(--r-pill);white-space:nowrap;
  border:1px solid var(--line);background:#fff;color:var(--muted);
}
.chip .ic{width:14px;height:14px}
.chip-ok{color:var(--emerald-ink);background:var(--mint);border-color:#A7F3D0}
.chip-cy{color:var(--sky-ink);background:var(--soft-blue);border-color:#BAE6FD}
.chip-soon{color:var(--faint)}

/* filter chips — Practice, Ask and Papers */
.chiprow{display:flex;gap:8px;flex-wrap:wrap}
.pp-filter{
  display:inline-flex;align-items:center;min-height:42px;
  font-size:14px;font-weight:700;padding:8px 15px;border-radius:var(--r-pill);cursor:pointer;text-decoration:none;
  border:1.5px solid var(--line);background:#fff;color:var(--muted);
  transition:border-color var(--t-fast),background var(--t-fast),color var(--t-fast);
}
.pp-filter:hover{border-color:var(--line-strong);color:var(--navy)}
.pp-filter[aria-pressed="true"]{border-color:var(--emerald);color:var(--emerald-deep);background:var(--mint)}

/* ---------------------------------------------------- buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 22px;border-radius:14px;border:1.5px solid transparent;
  font-weight:750;font-size:15.5px;cursor:pointer;text-decoration:none;letter-spacing:-.01em;
  transition:transform var(--t-fast),background var(--t-fast),border-color var(--t-fast),box-shadow var(--t-fast);
  min-height:50px;
}
.btn .ic{width:18px;height:18px}
.btn:active{transform:scale(.975)}
.btn-primary{background:var(--emerald-ink);color:#fff;box-shadow:0 6px 16px -8px rgba(4,120,87,.7)}
.btn-primary:hover{background:var(--emerald-deep)}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--navy)}
.btn-ghost:hover{border-color:var(--line-strong);background:var(--surface-2)}
.btn-wide{width:100%}
.btn-sm{min-height:40px;padding:8px 14px;font-size:14px;border-radius:12px}
.btn[disabled]{opacity:.5;cursor:not-allowed;box-shadow:none}
.btnrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.btnrow .btn{flex:1 1 auto}
.btnrow-c{justify-content:center}
.btnrow-c .btn{flex:0 1 auto}

/* ---------------------------------------------------- fields */
.search,.selects select,.field input{
  width:100%;background:#fff;border:1.5px solid var(--line);border-radius:14px;
  padding:12px 14px;color:var(--text);font-size:16px;min-height:50px;
  transition:border-color var(--t-fast),box-shadow var(--t-fast);
}
.search:focus,.selects select:focus,.field input:focus{outline:none;border-color:var(--sky);box-shadow:var(--ring)}

.searchbox{
  position:relative;display:flex;align-items:center;
  background:#fff;border:1.5px solid var(--line);border-radius:16px;box-shadow:var(--sh-1);
  transition:border-color var(--t-fast),box-shadow var(--t-fast);
}
.searchbox:focus-within{border-color:var(--sky);box-shadow:var(--ring)}
.searchbox>.ic{position:absolute;left:15px;width:21px;height:21px;color:var(--faint);pointer-events:none}
.searchbox input{
  flex:1;min-width:0;border:none;background:none;outline:none;box-shadow:none;
  padding:13px 14px 13px 46px;min-height:52px;font-size:16px;color:var(--text);border-radius:16px;
}
.searchbox input:focus,.searchbox input:focus-visible{box-shadow:none}
.searchbox input::placeholder,.search::placeholder,textarea::placeholder{color:#64748B}
.searchbox-lg{border-radius:20px;box-shadow:var(--sh-2);border-color:#D6DEE8}
.searchbox-lg input{min-height:60px;font-size:17px;padding-left:52px;border-radius:20px}
.searchbox-lg>.ic{left:18px;width:23px;height:23px;color:var(--emerald-ink)}

.selects select{appearance:none;-webkit-appearance:none;padding-right:36px;font-weight:600;
  background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);
  background-position:calc(100% - 19px) 22px,calc(100% - 14px) 22px;background-size:5px 5px;background-repeat:no-repeat;cursor:pointer}
.selects select option{background:#fff;color:var(--text)}
.selects{display:grid;gap:10px;margin-top:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
.selects label{display:block;position:relative;min-width:0}
.selects label:last-child{grid-column:1 / -1}
@media(min-width:560px){ .selects{grid-template-columns:repeat(3,minmax(0,1fr))} .selects label:last-child{grid-column:auto} }
.selects label span{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.field span{display:block;font-size:13px;font-weight:700;color:var(--muted);margin:0 0 6px 2px}
.field{display:block;margin:14px 0 10px}
.finder .chiprow{margin-top:12px}

/* ---------------------------------------------------- progress */
.bar{display:block;height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden;box-shadow:inset 0 0 0 1px rgba(11,31,58,.04)}
.bar>i{display:block;height:100%;border-radius:99px;background:var(--h,var(--emerald));transition:width .5s var(--ease)}
.bar-sm{height:6px}
.ring{--p:0;width:48px;height:48px;flex:0 0 48px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:800;color:var(--navy);
  background:conic-gradient(var(--h,var(--emerald)) calc(var(--p)*1%),var(--surface-2) 0);position:relative}
.ring::after{content:"";position:absolute;inset:5px;border-radius:50%;background:#fff}
.ring>b{position:relative;z-index:1;font-weight:800}

/* ---------------------------------------------------- home */
.home-hero{display:grid;gap:8px;align-items:center;padding:14px 0 0}
.hh-art{display:none}
.art{display:block;width:100%;height:auto}
@media(min-width:880px){
  .home-hero{grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);gap:40px;padding-top:36px}
  .hh-art{display:block}
}
.home-hero .searchbox{margin-top:22px;max-width:620px}
.hres{margin-top:10px;max-width:620px;background:#fff;border:1px solid var(--line);border-radius:var(--r-l);padding:14px;box-shadow:var(--sh-2)}
.hres-h{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);margin:4px 2px 8px}
.hres .grid+.hres-h,.hres .pgrid+.hres-h{margin-top:16px}
.hres .row{box-shadow:none;min-height:60px;padding:10px 12px}
.hres-all{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:14px;padding:12px;border-radius:12px;background:var(--mint);color:var(--emerald-deep);font-weight:750;text-decoration:none;font-size:14.5px;overflow-wrap:anywhere;text-align:center}
.hres-all .ic{width:17px;height:17px}
.streak{display:inline-flex;align-items:center;gap:7px;margin:16px 0 0;font-size:14px;font-weight:750;padding:7px 13px;border-radius:var(--r-pill);
  background:var(--soft-yellow);color:#92400E;border:1px solid #FDE68A}
.streak .ic{width:17px;height:17px;color:#EA580C}

/* the two front doors */
.duo{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
.duo-card{
  position:relative;display:flex;flex-direction:column;align-items:flex-start;min-height:168px;padding:18px;
  border-radius:var(--r-xl);text-decoration:none;overflow:hidden;
  background:var(--h-soft);border:1.5px solid var(--h-line);color:var(--navy);
  transition:transform var(--t-fast),box-shadow var(--t-fast);
}
.duo-card::after{ /* the ngazi steps, as a watermark */
  content:"";position:absolute;right:16px;top:22px;width:46px;height:40px;opacity:.28;
  background:
    linear-gradient(var(--h),var(--h)) 0 100%/12px 14px no-repeat,
    linear-gradient(var(--h),var(--h)) 17px 100%/12px 26px no-repeat,
    linear-gradient(var(--h),var(--h)) 34px 100%/12px 40px no-repeat;
}
.duo-card:hover{box-shadow:var(--sh-2);transform:translateY(-2px)}
.duo-card:active{transform:scale(.98)}
.duo-ic{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:var(--h-ink);color:#fff;margin-bottom:auto;box-shadow:0 8px 16px -10px var(--h-ink)}
.duo-ic .ic{width:27px;height:27px}
.duo-t{font-size:clamp(22px,6vw,30px);font-weight:800;letter-spacing:-.035em;margin-top:16px;line-height:1.1}
.duo-s{font-size:13.5px;color:var(--muted);line-height:1.4;margin-top:4px;max-width:30ch}
.duo-go{display:none}
@media(min-width:620px){
  .duo-card{min-height:190px;padding:24px}
  .duo-card::after{top:auto;bottom:22px;right:22px}
  .duo-s{font-size:15px;padding-right:60px}
  .duo-go{display:grid;position:absolute;top:22px;right:22px;width:40px;height:40px;border-radius:50%;place-items:center;background:#fff;color:var(--h-ink)}
}

.continue{
  display:flex;align-items:center;gap:14px;text-decoration:none;
  border-radius:var(--r-l);padding:16px;border:1.5px solid var(--h-line);
  background:#fff;box-shadow:var(--sh-2);transition:box-shadow var(--t-fast),transform var(--t-fast);
}
.continue:hover{transform:translateY(-1px)}
.continue-ic{width:52px;height:52px;flex:0 0 52px;border-radius:16px;display:grid;place-items:center;background:var(--h-soft);color:var(--h-ink)}
.continue-ic .ic{width:26px;height:26px}
.continue-body{flex:1;min-width:0;display:block}
.continue-l{display:block;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--h-ink)}
.continue-t{display:block;font-weight:800;font-size:18px;letter-spacing:-.02em;color:var(--navy);overflow-wrap:anywhere;line-height:1.3}
.continue-s{display:block;font-size:13.5px;color:var(--muted);margin-bottom:8px}
.continue-pct{font-weight:800;font-size:15px;color:var(--h-ink);background:var(--h-soft);border-radius:12px;padding:8px 10px;flex:0 0 auto}

.startcard{
  display:flex;align-items:center;gap:16px;text-decoration:none;padding:18px;border-radius:var(--r-xl);
  background:linear-gradient(120deg,#ECFDF5,#F0F9FF 60%,#FEFCE8);border:1.5px solid #CDEFE0;
}
.startcard-art{flex:0 0 96px;width:96px}
.startcard-body{display:flex;flex-direction:column;align-items:flex-start;gap:4px;min-width:0}
.startcard-t{font-size:19px;font-weight:800;letter-spacing:-.025em;color:var(--navy);line-height:1.25}
.startcard-s{font-size:14px;color:var(--muted);margin-bottom:8px}
@media(max-width:380px){ .startcard{flex-direction:column;align-items:flex-start} .startcard-art{width:84px;flex-basis:auto} }

.classpill{
  display:flex;align-items:center;gap:10px;padding:8px 16px 8px 8px;border-radius:var(--r-pill);
  background:#fff;border:1.5px solid var(--line);text-decoration:none;font-weight:750;font-size:15px;color:var(--navy);
  transition:border-color var(--t-fast),background var(--t-fast);
}
.classpill b{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--navy);color:#fff;font-size:14px}
.classpill:nth-child(5n+1) b{background:var(--emerald-ink)}
.classpill:nth-child(5n+2) b{background:var(--sky-ink)}
.classpill:nth-child(5n+3) b{background:var(--purple-ink)}
.classpill:nth-child(5n+4) b{background:var(--coral-ink)}
.classpill:hover{border-color:var(--line-strong);background:var(--surface-2)}

.bento{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
.bento-cell{
  display:flex;flex-direction:column;gap:4px;min-height:140px;padding:16px;border-radius:var(--r-l);
  background:#fff;border:1px solid var(--line);text-decoration:none;box-shadow:var(--sh-1);
  transition:border-color var(--t-fast),box-shadow var(--t-fast),transform var(--t-fast);min-width:0;
}
.bento-cell:hover{border-color:var(--h-line);box-shadow:var(--sh-2)}
.bento-cell:active{transform:scale(.98)}
.bento-ic{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:var(--h-soft);color:var(--h-ink);margin-bottom:auto}
.bento-ic .ic{width:23px;height:23px}
.bento-t{font-weight:800;font-size:17px;letter-spacing:-.02em;color:var(--navy);margin-top:12px;line-height:1.25}
.bento-s{font-size:13px;color:var(--muted);line-height:1.4}
@media(min-width:760px){
  .bento{grid-template-columns:repeat(4,minmax(0,1fr))}
  .bento-cell:first-child{grid-column:span 2;background:var(--h-soft);border-color:var(--h-line)}
  .bento-cell:first-child .bento-ic{background:#fff}
  .bento-cell:nth-child(2){grid-column:span 2}
}

.shelf-wait{font-size:14px;color:var(--faint);padding:30px 0}

/* ---------------------------------------------------- learn */
.pagehead{display:flex;align-items:center;gap:16px}
.pagehead>div{min-width:0}
.pagehead-ic,.pagehead-n{
  width:60px;height:60px;flex:0 0 60px;border-radius:18px;display:grid;place-items:center;
  background:var(--h-soft);color:var(--h-ink);border:1.5px solid var(--h-line);
}
.pagehead-ic .ic{width:30px;height:30px}
.pagehead-n{font-size:26px;font-weight:800;letter-spacing:-.03em;background:var(--h-ink);color:#fff;border-color:transparent}
.pagehead .lede{margin-top:4px}
@media(max-width:400px){ .pagehead-ic,.pagehead-n{width:50px;height:50px;flex-basis:50px;border-radius:15px} }

.classgrid{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
@media(min-width:760px){ .classgrid{grid-template-columns:repeat(4,minmax(0,1fr))} }
.classcard{
  display:flex;flex-direction:column;gap:2px;padding:16px;border-radius:var(--r-l);min-height:136px;
  background:#fff;border:1px solid var(--line);text-decoration:none;box-shadow:var(--sh-1);
  transition:border-color var(--t-fast),box-shadow var(--t-fast),transform var(--t-fast);min-width:0;
}
.classcard:hover{border-color:var(--h-line);box-shadow:var(--sh-2)}
.classcard:active{transform:scale(.98)}
.classcard-n{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:var(--h-ink);color:#fff;font-weight:800;font-size:19px;margin-bottom:auto}
.classcard-t{font-weight:800;font-size:17.5px;letter-spacing:-.02em;color:var(--navy);margin-top:12px}
.classcard-s{font-size:13px;color:var(--muted)}
.classcard .bar{margin-top:8px}

.subjgrid{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
@media(min-width:760px){ .subjgrid{grid-template-columns:repeat(3,minmax(0,1fr))} }
.subjcard{
  display:flex;flex-direction:column;gap:3px;padding:16px;border-radius:var(--r-l);min-height:160px;
  background:var(--h-soft);border:1.5px solid var(--h-line);text-decoration:none;min-width:0;
  transition:box-shadow var(--t-fast),transform var(--t-fast);
}
.subjcard:hover{box-shadow:var(--sh-2);transform:translateY(-2px)}
.subjcard:active{transform:scale(.98)}
.subjcard-ic{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;background:#fff;color:var(--h-ink);margin-bottom:auto;box-shadow:var(--sh-1)}
.subjcard-ic .ic{width:25px;height:25px}
.subjcard-t{font-weight:800;font-size:17px;letter-spacing:-.02em;color:var(--navy);margin-top:14px;line-height:1.25;overflow-wrap:anywhere}
.subjcard-s{font-size:13px;color:var(--muted)}
.subjcard .bar{margin-top:8px;background:rgba(255,255,255,.8)}

.progcard{margin-top:22px}
.progcard-row{display:flex;justify-content:space-between;gap:12px;font-size:14.5px;margin-bottom:10px;color:var(--muted)}
.progcard-row b{color:var(--navy)}

/* the learning path: a ladder of numbered steps */
.path{list-style:none;margin:0;padding:0;position:relative;counter-reset:none}
.path::before{content:"";position:absolute;left:27px;top:28px;bottom:28px;width:3px;border-radius:3px;background:var(--h-line)}
.path-step{position:relative;margin:0 0 10px}
.path-step>a{
  display:flex;align-items:center;gap:14px;text-decoration:none;padding:12px 14px 12px 8px;border-radius:var(--r-m);
  transition:background var(--t-fast);min-height:68px;
}
.path-step>a:hover{background:#fff;box-shadow:var(--sh-1)}
.path-node{
  position:relative;z-index:1;width:40px;height:40px;flex:0 0 40px;margin-left:0;border-radius:50%;display:grid;place-items:center;
  background:#fff;border:3px solid var(--h-line);color:var(--h-ink);font-weight:800;font-size:15px;
}
.path-step.is-going .path-node{border-color:var(--h)}
.path-step.is-done .path-node{background:var(--h-ink);border-color:var(--h-ink);color:#fff}
.path-node .ic{width:18px;height:18px;stroke-width:3}
.path-body{flex:1;min-width:0;display:block}
.path-t{display:block;font-weight:750;font-size:16.5px;color:var(--navy);line-height:1.35}
.path-s{display:block;font-size:13.5px;color:var(--muted);margin-top:2px;line-height:1.45}
.path .row-go{background:#fff}

.topichero{
  border-radius:var(--r-xl);padding:20px;background:var(--h-soft);border:1.5px solid var(--h-line);
}
.topichero .chips{margin-bottom:12px}
.topichero .chip{border-color:transparent}
.topichero .lede{color:#334155}
.topichero-status{display:flex;align-items:center;gap:14px;margin-top:18px;background:#fff;border-radius:var(--r-m);padding:12px 14px}
.topichero-status>div{min-width:0}
.topichero-st{font-weight:800;color:var(--navy)}
.topichero-status .tiny{margin-top:1px}
@media(min-width:620px){ .topichero{padding:28px} }

.actions{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
@media(min-width:760px){ .actions{grid-template-columns:repeat(4,minmax(0,1fr))} }
.action{
  position:relative;display:flex;flex-direction:column;gap:2px;padding:16px;border-radius:var(--r-l);min-height:138px;
  background:#fff;border:1px solid var(--line);text-decoration:none;box-shadow:var(--sh-1);min-width:0;
  transition:border-color var(--t-fast),box-shadow var(--t-fast),transform var(--t-fast);
}
.action:hover{border-color:var(--h-line);box-shadow:var(--sh-2)}
.action:active{transform:scale(.98)}
.action-ic{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:var(--h-soft);color:var(--h-ink);margin-bottom:auto}
.action-ic .ic{width:24px;height:24px}
.action-t{font-weight:800;font-size:17px;color:var(--navy);margin-top:12px;letter-spacing:-.02em}
.action-s{font-size:13px;color:var(--muted);line-height:1.35;overflow-wrap:anywhere}
.action-badge{position:absolute;top:12px;right:12px;font-size:11.5px;font-weight:800;padding:4px 9px;border-radius:999px;background:var(--mint);color:var(--emerald-deep)}

.ticks-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.ticks-list li{display:flex;gap:10px;align-items:flex-start}
.ticks-list .ic{width:20px;height:20px;margin-top:2px;color:#fff;background:var(--emerald);border-radius:50%;padding:3px;stroke-width:3.2}

/* ---------------------------------------------------- lesson */
.lessonhead{display:flex;align-items:center;gap:14px}
.lessonhead>div{min-width:0}
.lessonhead .tiny{margin:4px 0 0}
.toc{margin-top:18px}
.toc button{
  display:inline-flex;align-items:center;gap:8px;max-width:78vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  padding:8px 14px 8px 8px;border-radius:999px;border:1.5px solid var(--line);background:#fff;cursor:pointer;
  font-size:14px;font-weight:650;color:var(--navy);min-height:42px;
}
.toc button b{width:26px;height:26px;flex:0 0 26px;border-radius:50%;display:grid;place-items:center;background:var(--h-soft,var(--mint));color:var(--h-ink,var(--emerald-ink));font-size:12.5px}
.toc button:hover{border-color:var(--line-strong)}
.lesson .note{margin-bottom:14px;padding:20px;scroll-margin-top:90px}
.note-step{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--h-ink,var(--emerald-ink));background:var(--h-soft,var(--mint));padding:4px 10px;border-radius:999px;margin-bottom:10px}
.note-h{font-size:21px;font-weight:800;margin:0 0 10px;letter-spacing:-.025em}
.note p{margin:0 0 12px;color:#1E293B;font-size:16.5px;line-height:1.7}
.note ul{margin:0 0 12px;padding-left:22px;color:#1E293B;font-size:16.5px}
.note li{margin:6px 0}
.note li::marker{color:var(--h,var(--emerald))}
.note strong{color:var(--navy)}
/* nowrap keeps a spaced number like 9 314 620 on one line */
.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--soft-blue);color:#075985;border-radius:7px;padding:1px 6px;font-size:.92em;white-space:nowrap;font-weight:600}
.eg{border:1.5px solid #FDE68A;padding:14px 16px;border-radius:var(--r-m);background:#FFFCF0;margin:16px 0 0;position:relative}
.eg-l{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#92400E;margin-bottom:6px}
.eg-l::before{content:"";width:10px;height:10px;border-radius:3px;background:var(--yellow)}
.eg ol{margin:10px 0 0;padding-left:22px}
.eg li{margin:6px 0}
.eg li::marker{font-weight:800;color:#92400E}
.terms{display:grid;gap:10px}
@media(min-width:620px){ .terms{grid-template-columns:repeat(2,minmax(0,1fr))} }
.terms .term{flex-direction:column;gap:2px;border:1px solid var(--line);border-radius:var(--r-s);padding:12px 14px;background:var(--bg)}
.terms .term b{flex:none;color:var(--h-ink,var(--emerald-ink))}
.term{display:flex;gap:10px;padding:11px 0;border-bottom:1px solid var(--line)}
.term:last-child{border-bottom:none}
.terms .term:last-child{border-bottom:1px solid var(--line)}
.term b{flex:0 0 38%;font-weight:750;color:var(--navy)}
.term span{color:var(--muted);font-size:14.5px}
.tablewrap{overflow-x:auto;margin:0 0 12px;border:1px solid var(--line);border-radius:12px}
.ntable{border-collapse:collapse;width:100%;font-size:14.5px}
.ntable th,.ntable td{padding:9px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.ntable th{background:var(--h-soft,var(--surface-2));font-weight:750;color:var(--navy)}
.ntable tr:last-child td{border-bottom:none}

/* comfortable reading width on big screens */
@media(min-width:900px){
  .lesson,.lessonhead,.toc{max-width:800px}
  .toc{margin-left:0;padding-left:0}
  .view>.btnrow,.view>#relPapers{max-width:800px}
  .path{max-width:860px}
  .q-head,.q-text,#opts,#fb,#nav,.view>.bar,.scorecard{max-width:760px}
}

/* reading progress: scroll-driven where the browser supports it, no JS */
.readbar{display:none}
@supports (animation-timeline:scroll()){
  .readbar{display:block;position:fixed;left:0;right:0;top:0;height:4px;z-index:60;background:linear-gradient(90deg,var(--emerald),var(--sky),var(--purple));
    transform-origin:0 50%;transform:scaleX(0);animation:readbar linear both;animation-timeline:scroll(root)}
  @keyframes readbar{to{transform:scaleX(1)}}
}

/* ---------------------------------------------------- practice */
.q-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
.q-count{font-size:13.5px;color:var(--muted);font-weight:700}
.q-count:last-child{color:var(--emerald-ink);background:var(--mint);padding:3px 10px;border-radius:999px}
.q-text{font-size:clamp(19px,5vw,23px);font-weight:750;line-height:1.45;letter-spacing:-.02em;margin:0 0 18px}
.opt{
  display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;cursor:pointer;
  background:#fff;border:2px solid var(--line);border-radius:16px;padding:14px 15px;
  margin-bottom:10px;transition:border-color var(--t-fast),background var(--t-fast),transform var(--t-fast);min-height:58px;
  box-shadow:0 2px 0 var(--line);
}
.opt:hover:not(:disabled){border-color:var(--sky);box-shadow:0 2px 0 #BAE6FD}
.opt:active:not(:disabled){transform:translateY(2px);box-shadow:none}
.opt-k{
  flex:0 0 30px;height:30px;border-radius:9px;display:grid;place-items:center;
  background:var(--surface-2);font-size:13.5px;font-weight:800;color:var(--navy)
}
.opt-t{flex:1;padding-top:3px;font-size:16px;font-weight:600;color:var(--navy)}
.opt.is-right{border-color:var(--emerald);background:#ECFDF5;box-shadow:0 2px 0 #A7F3D0}
.opt.is-right .opt-k{background:var(--emerald-ink);color:#fff}
.opt.is-wrong{border-color:var(--coral);background:#FFF1F2;box-shadow:0 2px 0 #FECDD3}
.opt.is-wrong .opt-k{background:var(--coral-ink);color:#fff}
.opt:disabled{cursor:default}
.fb{border-radius:16px;padding:15px 16px;margin-top:8px;border:1.5px solid var(--line);background:#fff}
.fb-t{font-weight:800;margin-bottom:5px;font-size:15.5px;color:var(--sky-ink)}
.fb-ok{background:#ECFDF5;border-color:#A7F3D0}
.fb-ok .fb-t{color:var(--emerald-ink)}
.fb-no{background:#FFF1F2;border-color:#FECDD3}
.fb-no .fb-t{color:var(--coral-ink)}
.fb p{margin:0;color:#1E293B;font-size:15.5px;line-height:1.6}

.score{text-align:center;padding:10px 0 4px}
.score-n{font-size:64px;font-weight:800;letter-spacing:-.05em;line-height:1;color:var(--emerald-ink)}
.score-l{color:var(--muted);margin-top:10px;font-weight:600}

/* ---------------------------------------------------- ask ngazi */
.ask-log{display:flex;flex-direction:column;gap:12px;margin-bottom:16px;min-height:120px}
.bub{padding:13px 15px;border-radius:18px;max-width:92%;font-size:15.5px;line-height:1.6;overflow-wrap:anywhere}
.bub-you{align-self:flex-end;background:var(--navy);color:#fff;border-bottom-right-radius:6px}
.bub-ng{align-self:flex-start;background:var(--soft-purple);color:#1E1B4B;border-bottom-left-radius:6px}
.bub-ng .src{display:block;margin-top:9px;font-size:12.5px;color:#4C4F7A;border-top:1px solid rgba(109,40,217,.18);padding-top:7px}
.bub-ng .src a{color:var(--purple-ink);font-weight:700}
.askform{display:flex;gap:9px;align-items:flex-end}
.askform textarea{
  flex:1;min-width:0;background:#fff;border:1.5px solid var(--line);border-radius:16px;
  padding:13px 14px;color:var(--text);font:inherit;font-size:16px;resize:none;min-height:52px;max-height:130px;
}
.askform textarea:focus{outline:none;border-color:var(--sky);box-shadow:var(--ring)}
.sugs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.sug{font-size:14px;padding:9px 14px;min-height:42px;border-radius:999px;border:1.5px solid #DDD6FE;background:#fff;cursor:pointer;color:var(--purple-ink);font-weight:650;text-align:left}
.sug:hover{background:var(--soft-purple)}

/* ---------------------------------------------------- study desk */
.stats{display:grid;gap:10px;grid-template-columns:repeat(2,minmax(0,1fr))}
@media(min-width:760px){ .stats{grid-template-columns:repeat(4,minmax(0,1fr))} }
.stat{display:flex;flex-direction:column;gap:0;padding:14px 16px;border-radius:var(--r-l);background:var(--h-soft,#fff);border:1.5px solid var(--h-line,var(--line))}
.stat-ic{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:#fff;color:var(--h-ink);margin-bottom:10px}
.stat-ic .ic{width:20px;height:20px}
.stat b{display:block;font-size:28px;font-weight:800;letter-spacing:-.03em;color:var(--navy);line-height:1.1}
.stat span{font-size:13px;color:var(--muted);font-weight:600}
.subjprog{padding:6px 8px}
.subjprog-row{display:flex;align-items:center;gap:12px;padding:10px 8px;text-decoration:none;border-radius:12px}
.subjprog-row+.subjprog-row{border-top:1px solid var(--line)}
.subjprog-row:hover{background:var(--bg)}
.subjprog-ic{width:40px;height:40px;flex:0 0 40px;border-radius:12px;display:grid;place-items:center;background:var(--h-soft);color:var(--h-ink)}
.subjprog-ic .ic{width:21px;height:21px}
.subjprog-body{flex:1;min-width:0;display:block}
.subjprog-t{display:flex;gap:8px;align-items:baseline;margin-bottom:6px;min-width:0}
.subjprog-t b{color:var(--navy);font-weight:750;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.subjprog-t span{font-size:12.5px;color:var(--faint);white-space:nowrap}
.subjprog-n{font-weight:800;color:var(--h-ink);font-size:14px}

/* ---------------------------------------------------- misc */
details summary{cursor:pointer;list-style:none}
details summary::-webkit-details-marker{display:none}
details summary::after{content:" +";color:var(--faint)}
details[open] summary::after{content:" –"}

.empty{text-align:center;padding:40px 20px;color:var(--muted)}
.empty-art{display:block;width:120px;margin:0 auto 16px}
.empty h2{font-size:21px;margin-bottom:8px}
.empty p{margin:0 auto;max-width:44ch}

.toast{
  position:fixed;left:50%;transform:translateX(-50%);bottom:calc(var(--nav-h) + 20px + var(--sab));z-index:80;
  background:var(--navy);color:#fff;border-radius:14px;font-weight:650;
  padding:12px 18px;font-size:14.5px;box-shadow:var(--shadow);max-width:calc(100vw - 32px);
}
@media(min-width:760px){ .toast{bottom:calc(24px + var(--sab))} }

.noscript{max-width:560px;margin:16vh auto;padding:0 24px;text-align:center}
.noscript h1{font-size:26px;margin-bottom:12px}
.noscript p{color:var(--muted)}

.foot{margin-top:48px;padding-top:18px;border-top:1px solid var(--line);color:var(--faint);font-size:13px;line-height:1.7}
.foot b{color:var(--navy)}
.foot a{color:var(--muted)}

/* enter animation for view swaps: opacity + transform only */
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.view>*{animation:rise .26s var(--ease) both}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .readbar{display:none!important}
}

@media print{
  body::before,.tabs,.readbar,.toc{display:none!important}
}