/* Bachair interface. Same flat, bold language as the lesson decks: paper ground, ink type,
   solid colour blocks. Red is reserved for the one primary action on a screen. */
:root{
  --paper:#F5EFEC; --ink:#131415; --body:#4A4D52; --line:#DDD3CD; --white:#FFFFFF;
  --red:#F44B36; --on-red:#131415; --red-text:#C8321F;
  --mint:#9FE5B1; --lav:#D8CCF3; --slate:#465372; --on-slate:#F5EFEC; --sun:#F6D26B;
  --warn:#F9C7BF; --focus:#4B3FD8;
  --sans:'Thmanyah Sans',Tahoma,'Segoe UI',system-ui,sans-serif;
  --bold:'Thmanyah Sans Bold','Thmanyah Sans',Tahoma,sans-serif;
  --black:'Thmanyah Sans Black','Thmanyah Sans Bold',Tahoma,sans-serif;
  --serif:'Thmanyah Serif Display','Thmanyah Sans Black',Georgia,serif;
  color-scheme:light;
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--paper);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:18px;line-height:1.65}
h1,h2,h3,p{margin:0;font-weight:400}
b,strong{font-family:var(--bold);font-weight:400}
a{color:inherit}
button,input,select{font:inherit;color:inherit;max-width:100%}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px;border-radius:6px}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- top bar ---------- */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;max-width:1120px;margin-inline:auto;padding:18px 20px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-family:var(--black);font-size:30px;line-height:1}
.brand svg{width:34px;height:34px;flex:none}
.menu{position:relative}
.menu summary{list-style:none;display:flex;align-items:center;gap:10px;cursor:pointer;padding:6px 6px 6px 14px;border-radius:999px;border:2px solid var(--ink);background:transparent;font-family:var(--bold);font-size:17px;user-select:none}
.menu summary::-webkit-details-marker{display:none}
.menu summary:hover{background:var(--white)}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--paper);display:grid;place-items:center;font-family:var(--black);font-size:17px;flex:none}
.menu[open] summary{background:var(--white)}
.menu .sheet{position:absolute;inset-inline-start:0;top:calc(100% + 8px);min-width:230px;background:var(--white);border:2px solid var(--ink);border-radius:20px;padding:8px;z-index:20}
.menu .who{padding:8px 14px 10px;border-bottom:1px solid var(--line);margin-bottom:6px}
.menu .who small{display:block;color:var(--body);font-size:15px}
.menu .sheet a,.menu .sheet button{display:block;width:100%;text-align:start;background:none;border:0;padding:9px 14px;border-radius:12px;text-decoration:none;font-size:17px}
.menu .sheet a:hover,.menu .sheet button:hover{background:var(--paper)}

/* ---------- page ---------- */
.page{max-width:1120px;margin-inline:auto;padding:12px 20px 80px}
.page-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:14px 24px;margin-block:18px 26px}
.page-head h1{font-family:var(--black);font-size:clamp(34px,6vw,52px);line-height:1.2}
.page-head p{color:var(--body);margin-top:4px}

/* segmented filter */
.seg{display:inline-flex;flex-wrap:nowrap;max-width:100%;overflow-x:auto;scrollbar-width:none;gap:4px;padding:4px;border-radius:999px;background:var(--white);border:2px solid var(--ink)}
.seg::-webkit-scrollbar{display:none}
.seg button{white-space:nowrap;flex:none;border:0;background:transparent;border-radius:999px;padding:3px 18px;font-family:var(--bold);font-size:16px}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.seg button:not([aria-pressed="true"]):hover{background:var(--paper)}

/* ---------- lesson covers ---------- */
.shelf{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,330px),1fr));gap:20px}
.cover{position:relative;display:flex;flex-direction:column;gap:12px;min-height:340px;padding:26px 26px 22px;border-radius:32px;overflow:hidden;background:var(--bg);color:var(--fg)}
.cover.c0{--bg:var(--mint);--fg:var(--ink);--sub:#1F4A2C}
.cover.c1{--bg:var(--lav);--fg:var(--ink);--sub:#3F3A66}
.cover.c2{--bg:var(--slate);--fg:var(--on-slate);--sub:#C9D1E6}
.cover.c3{--bg:var(--sun);--fg:var(--ink);--sub:#5C4A0B}
.cover .level{align-self:flex-start;background:var(--fg);color:var(--bg);border-radius:999px;padding:0 14px;font-family:var(--bold);font-size:15px;line-height:1.7}
.cover h2{font-family:var(--serif);font-size:clamp(34px,5vw,44px);line-height:1.35}
.cover .meta{color:var(--sub);font-size:16px}
.cover .actions{display:flex;flex-direction:column;align-items:stretch;gap:10px;margin-block-start:auto;position:relative;z-index:1}
.go{display:flex;align-items:center;justify-content:center;gap:10px;background:var(--fg);color:var(--bg);text-decoration:none;border-radius:999px;padding:11px 22px;font-family:var(--bold);font-size:19px}
.go svg{width:16px;height:16px;flex:none}
.go:hover{filter:brightness(1.12)}
.alt{display:flex;flex-direction:column;align-items:center;gap:2px;min-height:56px}
.alt a{color:var(--fg);font-size:16px;text-underline-offset:4px}
.cover .tag{position:absolute;top:22px;inset-inline-end:24px;background:var(--warn);color:var(--ink);border-radius:999px;padding:0 12px;font-size:14px}

/* ---------- empty / messages ---------- */
.empty{max-width:520px;margin:48px auto;text-align:center}
.empty svg{width:72px;height:72px;margin-bottom:14px}
.empty h2{font-family:var(--black);font-size:26px;margin-bottom:6px}
.empty p{color:var(--body)}
.msg{margin-block-start:14px;padding:10px 16px;border-radius:14px;background:var(--warn);color:var(--ink)}
.msg.ok{background:var(--mint)}

/* ---------- forms and panels ---------- */
.panel{background:var(--white);border:2px solid var(--ink);border-radius:28px;padding:24px 26px 26px}
.panel>h2{font-family:var(--black);font-size:24px;margin-bottom:4px}
.panel .hint{color:var(--body);font-size:16px}
label.f{display:block;font-family:var(--bold);margin-block:16px 6px}
input[type=text],input[type=password]{display:block;width:100%;background:var(--paper);border:2px solid var(--line);border-radius:14px;padding:10px 14px;min-height:50px}
input[type=text]:focus,input[type=password]:focus{border-color:var(--ink);outline-offset:2px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;background:var(--red);color:var(--on-red);border-radius:999px;padding:10px 28px;font-family:var(--bold);font-size:18px;text-decoration:none}
.btn:disabled{opacity:.5;cursor:default}
.btn.ghost{background:transparent;border:2px solid var(--ink);color:var(--ink)}
.btn.sm{padding:3px 16px;font-size:16px}
.linkbtn{background:none;border:0;padding:0;color:var(--red-text);text-decoration:underline;text-underline-offset:4px;font-size:16px}

/* ---------- sign-in / password pages ---------- */
.center{min-height:100vh;display:grid;place-items:center;padding:24px 16px}
.center .box{width:100%;max-width:440px}
.mark{display:flex;flex-direction:column;align-items:center;gap:6px;margin-bottom:22px;text-align:center}
.mark svg{width:64px;height:64px}
.mark .name{font-family:var(--black);font-size:44px;line-height:1.1}
.mark .tagline{color:var(--body);font-size:17px}
.foot{margin-top:16px;text-align:center;color:var(--body);font-size:15px}

/* ---------- account management ---------- */
.stack{display:flex;flex-direction:column;gap:22px}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-block:8px 12px}
.sec-head h2{font-family:var(--black);font-size:26px}
.sec-head span{color:var(--body);font-size:16px}
.people{display:flex;flex-direction:column;gap:12px}
.person{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px 16px;background:var(--white);border:2px solid var(--ink);border-radius:24px;padding:16px 20px}
.person.off{background:transparent;border-style:dashed;border-color:var(--body)}
.person .ava{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;font-family:var(--black);font-size:22px;background:var(--bg);color:var(--fg)}
.person .ava.c0{--bg:var(--mint);--fg:var(--ink)}.person .ava.c1{--bg:var(--lav);--fg:var(--ink)}
.person .ava.c2{--bg:var(--slate);--fg:var(--on-slate)}.person .ava.c3{--bg:var(--sun);--fg:var(--ink)}
.person .name{font-family:var(--bold);font-size:20px;line-height:1.3}
.person .sub{color:var(--body);font-size:15px}
.person .sub bdi{direction:ltr;unicode-bidi:isolate}
.person .lvls{grid-column:1/-1;display:flex;flex-wrap:wrap;align-items:center;gap:8px 6px}
.person .lvls>span{color:var(--body);font-size:15px;margin-inline-end:6px}
.lv{width:38px;height:38px;border-radius:50%;border:2px solid var(--ink);background:transparent;font-family:var(--bold);font-size:16px;padding:0}
.lv[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.lv:not([aria-pressed="true"]):hover{background:var(--paper)}
.person .acts{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end;grid-column:1/-1}
.btn.danger{background:var(--red);border-color:var(--red);color:var(--on-red)}
.saved{color:#1F6B3A;font-family:var(--bold);font-size:15px;min-height:1.6em}
.temp{background:var(--mint);border-radius:24px;padding:18px 22px}
.temp code{display:block;margin-block:8px 12px;font-size:32px;letter-spacing:3px;direction:ltr;text-align:center;unicode-bidi:isolate;font-family:ui-monospace,Menlo,monospace;background:var(--white);border-radius:16px;padding:8px}
.temp .row{display:flex;gap:12px;align-items:center}
.levels-pick{display:flex;flex-wrap:wrap;gap:8px}

@media (max-width:560px){
  .person{grid-template-columns:auto 1fr}
  .person .acts{justify-content:flex-start}
  body{font-size:17px}
  .topbar{padding:14px 16px}.page{padding-inline:16px}
  .cover{min-height:300px;border-radius:28px}
  .sec-head h2{font-size:23px}
}
@media (prefers-reduced-motion:no-preference){
  .go,.menu summary,.seg button{transition:background-color .15s,filter .15s}
}