/* Design system shared by the admin dashboard and the student portal */
:root{
  --bg:#f5f6fb;--surface:#fff;--surface2:#f8f9fd;--ink:#171b2e;--ink2:#4a516b;--mute:#8189a3;--line:#e8eaf3;
  --pri:#5b5bf0;--pri2:#8b5cf6;--pri-soft:#eeeefe;--grad:linear-gradient(135deg,#5b5bf0 0%,#8b5cf6 100%);
  --ok:#10a37f;--ok-soft:#e3f6f0;--bad:#e5484d;--bad-soft:#fdecec;--warn:#d98a00;--warn-soft:#fff4de;--info:#2b8be0;--info-soft:#e6f2fd;
  --shadow:0 1px 2px rgba(23,27,46,.04),0 8px 24px -8px rgba(23,27,46,.08);--shadow-lg:0 20px 50px -12px rgba(23,27,46,.25);
  --sid-bg:#312e81;--sid-tx:#fff;--r:16px;--r-sm:10px;--side:248px;color-scheme:light
}
:root[data-theme=dark]{
  --bg:#0d0f1a;--surface:#161a2b;--surface2:#1b2033;--ink:#eceefb;--ink2:#b3b8d1;--mute:#7c83a1;--line:#262c45;
  --sid-bg:#fde047;--sid-tx:#1c1917;--pri:#7c7cff;--pri2:#a78bfa;--pri-soft:#232349;--ok:#3ccf9a;--ok-soft:#13352c;--bad:#ff7a7f;--bad-soft:#3a1d22;--warn:#f0b34a;--warn-soft:#3a2d12;--info:#5bb0ff;--info-soft:#142b42;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px -8px rgba(0,0,0,.5);--shadow-lg:0 20px 50px -12px rgba(0,0,0,.7);color-scheme:dark
}
*{box-sizing:border-box}
html,body{margin:0}
body{font:14px/1.5 Inter,"Segoe UI",system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{margin:0;letter-spacing:-.02em}
a{color:var(--pri);text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
.mute{color:var(--mute)}.ok{color:var(--ok)}.bad{color:var(--bad)}.warn{color:var(--warn)}.num{font-variant-numeric:tabular-nums}
svg.i{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* layout */
.shell{display:flex;min-height:100vh}
.side{width:var(--side);flex:none;background:var(--surface);border-right:1px solid var(--line);padding:18px 14px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:4px;overflow-y:auto}
.brand{display:flex;align-items:center;gap:11px;padding:4px 8px 18px;font-weight:700;font-size:16px;letter-spacing:-.02em}
.logo{width:36px;height:36px;border-radius:11px;background:var(--grad);color:#fff;display:grid;place-items:center;box-shadow:0 6px 16px -4px rgba(91,91,240,.55)}
.has-logo{background:#fff!important;box-shadow:none!important;padding:3px;overflow:hidden}
.has-logo img{width:100%;height:100%;object-fit:contain;display:block}
.chat{display:flex;flex-direction:column;gap:10px;max-height:460px;overflow-y:auto;padding:4px 2px;margin:12px 0}
.chat-m{align-self:flex-start;max-width:85%;min-width:0}
.chat-m.me{align-self:flex-end;text-align:right}
.chat-w{font-size:11.5px;color:var(--mute);margin-bottom:3px}
.chat-b{display:inline-block;text-align:left;padding:9px 13px;border-radius:14px;background:var(--surface2);border:1px solid var(--line);white-space:pre-wrap;overflow-wrap:anywhere}
.chat-m.me .chat-b{background:var(--pri-soft);border-color:transparent}
.chat-i{display:block;margin-bottom:4px}
.chat-i img{display:inline-block;max-width:min(260px,100%);max-height:260px;border-radius:12px;border:1px solid var(--line);vertical-align:top}
.chat-s{align-self:center;font-size:12px;color:var(--mute);text-align:center}
.g-chat{display:grid;gap:16px;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);align-items:start}
.tk{display:block;padding:12px;border-radius:12px;border:1px solid transparent;cursor:pointer;width:100%;text-align:left;background:none}
.tk:hover{background:var(--surface2)}.tk.on{background:var(--pri-soft);border-color:var(--pri)}
.tk+.tk{margin-top:4px}
.tk-p{display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden;font-size:13px;color:var(--mute);overflow-wrap:anywhere}
.chn{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:6px 0 4px;font-size:12.5px;color:var(--mute)}
.chn label{position:relative;display:inline-flex;align-items:center;gap:5px;padding:5px 10px;border-radius:99px;border:1px solid var(--line);background:var(--surface2);color:var(--mute);font-weight:600;cursor:pointer;user-select:none;transition:.12s}
.chn label svg{width:15px;height:15px}
.chn input{position:absolute;opacity:0;width:1px;height:1px}
.chn input:focus-visible+svg{outline:2px solid var(--pri);outline-offset:2px;border-radius:4px}
.chn label s{text-decoration:line-through}
.chn label:has(input:checked){color:#fff;border-color:transparent}
.chn label:has(input:checked) s{text-decoration:none}
.chn label.sms:has(input:checked){background:#2563eb}.chn label.wa:has(input:checked){background:#15803d}.chn label.mail:has(input:checked){background:#7c3aed}
.chn label.off{opacity:.55;cursor:not-allowed}
.nav-h{font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--mute);padding:14px 12px 6px}
.nav a{display:flex;align-items:center;gap:11px;padding:9px 12px;border-radius:11px;color:var(--ink2);font-weight:500;cursor:pointer;transition:.15s}
.nav a:hover{background:var(--surface2);color:var(--ink)}
.nav a.on{background:var(--pri-soft);color:var(--pri);font-weight:600}
.nav .badge{margin-left:auto}
.side .grow{flex:1}
.usercard{display:flex;align-items:center;gap:10px;padding:10px;border:1px solid var(--line);border-radius:14px;background:var(--surface2)}
/* reminder above the admin's name while the first-install password is still set */
.pwarn{display:flex;align-items:center;gap:8px;width:100%;margin-bottom:8px;padding:9px 10px;border:1px solid color-mix(in srgb,var(--warn) 45%,transparent);border-radius:14px;background:var(--warn-soft);color:var(--ink);font:inherit;text-align:left;cursor:pointer;transition:transform .15s,box-shadow .15s,border-color .15s}
.pwarn:hover{transform:translateY(-1px);border-color:var(--warn);box-shadow:0 6px 18px -8px var(--warn)}
.pwarn:focus-visible{outline:2px solid var(--warn);outline-offset:2px}
.pwi{position:relative;display:grid;place-items:center;flex:none;width:30px;height:30px;border-radius:10px;background:var(--warn);color:#fff}
.pwi svg{width:15px;height:15px}
.pwi::after{content:'';position:absolute;top:-3px;right:-3px;width:10px;height:10px;border-radius:50%;background:var(--bad);border:2px solid var(--warn-soft);animation:pwp 1.6s ease-in-out infinite}
@keyframes pwp{50%{transform:scale(1.25);opacity:.6}}
.pwt{flex:1;min-width:0;line-height:1.3}.pwt b,.pwt small{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pwt b{font-size:13px}.pwt small{font-size:11.5px;color:var(--mute)}
.pwc{flex:none;display:grid;color:var(--warn)}.pwc svg{width:14px;height:14px;transform:rotate(180deg)}
/* the admin's name opens their profile */
.ucp{display:flex;align-items:center;gap:10px;flex:1;min-width:0;padding:2px;margin:-2px;border:0;border-radius:10px;background:none;color:inherit;font:inherit;text-align:left;cursor:pointer}
.ucp:hover b{color:var(--pri)}.ucp:focus-visible{outline:2px solid var(--pri)}
.ucp>div{min-width:0}.ucp b{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
@media (prefers-reduced-motion:reduce){.pwi::after{animation:none}.pwarn{transition:none}}
/* district map: Sri Lanka as a tile map, darker tiles = more students */
.dmw{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:16px;align-items:start}
.dside{display:grid;gap:16px}
.dmap-card{position:relative;overflow:hidden;background:radial-gradient(120% 80% at 30% 0%,color-mix(in srgb,var(--pri) 12%,transparent),transparent 60%),var(--surface)}
.dmap-card h3 svg{width:18px;height:18px;vertical-align:-3px}
.lkw{max-width:440px;margin:4px auto 0}
.lkm{display:block;width:100%;height:auto;max-height:640px;overflow:visible;filter:drop-shadow(0 18px 30px rgba(139,92,246,.18))}
.lkd path{fill:color-mix(in srgb,#8b5cf6 calc(var(--t) * 100%),var(--surface2));stroke:var(--surface);stroke-width:1.3;stroke-linejoin:round;cursor:pointer;transition:fill .2s,filter .2s}
.lkd path.z{fill:color-mix(in srgb,#8b5cf6 7%,var(--surface2))}
.lkd path:hover{filter:brightness(1.18)}
.lkd path.on{stroke:#fff;stroke-width:2.6;filter:url(#lks) brightness(1.15)}
.lkb g{cursor:pointer}
.lkb circle{fill:var(--surface);stroke:url(#lkg);stroke-width:2.5;filter:drop-shadow(0 3px 6px rgba(0,0,0,.35))}
.lkb text{fill:var(--ink);font:700 12px/1 inherit;text-anchor:middle;pointer-events:none}
.dtip{position:absolute;z-index:5;pointer-events:none;padding:7px 11px;border-radius:10px;background:var(--ink);color:var(--surface);font-size:12.5px;line-height:1.35;box-shadow:0 10px 24px -8px rgba(0,0,0,.4);white-space:nowrap}
.dtip b{display:block;font-size:13.5px}
.dsrc{font-size:10.5px;text-align:right;margin-top:6px;opacity:.7}
.dleg{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--mute)}
.dleg i{width:80px;height:8px;border-radius:8px;background:linear-gradient(90deg,var(--surface2),#8b5cf6)}
.dtr{display:flex;align-items:center;gap:12px;padding:8px 4px;border-radius:10px;cursor:pointer}.dtr:hover{background:var(--surface2)}
.dtr .grow{flex:1;min-width:0}.dtr .row{justify-content:space-between}.dtr .bar{margin-top:6px}
.dtn{display:grid;place-items:center;flex:none;width:28px;height:28px;border-radius:9px;background:var(--pri-soft);color:var(--pri);font-weight:700;font-size:13px}
.dtr:first-child .dtn{background:linear-gradient(135deg,#f59e0b,#f472b6);color:#fff}
.dls{max-height:460px;overflow:auto;margin:0 -6px;padding:0 6px}
@media (max-width:900px){.dmw{grid-template-columns:minmax(0,1fr)}}
@media (max-width:560px){.grid.dk{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.dk .kpi{padding:14px}.dk .kpi .val{font-size:22px}.dk .kpi .ic{margin-bottom:8px}}
@media (prefers-reduced-motion:reduce){.lkd path{transition:none}}
.usercard b{display:block;font-size:13px}.usercard span{font-size:12px;color:var(--mute)}
.main{flex:1;min-width:0}
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;padding:14px 28px;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.top h1{font-size:20px;font-weight:700}
.top .sp{flex:1}
.page{padding:24px 28px 60px;max-width:1280px;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.btn.menu-btn{display:none}

/* surfaces */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--shadow)}
.card+.card{margin-top:0}
.card-h{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}
.card-h h3{font-size:15px;font-weight:650}
.grid{display:grid;gap:16px}
.g4{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.g2{grid-template-columns:repeat(auto-fit,minmax(340px,1fr))}
.g-main{grid-template-columns:minmax(0,2fr) minmax(0,1fr)}
.mt{margin-top:16px}
.kpi{position:relative;overflow:hidden}
.kpi .lbl{color:var(--mute);font-weight:500;font-size:13px;display:flex;align-items:center;gap:8px}
.kpi .ic{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;margin-bottom:12px}
.kpi .val{font-size:28px;font-weight:700;letter-spacing:-.03em;margin-top:2px}
.kpi .sub{font-size:12.5px;margin-top:4px;color:var(--mute)}
.ic.pri{background:var(--pri-soft);color:var(--pri)}.ic.ok{background:var(--ok-soft);color:var(--ok)}.ic.bad{background:var(--bad-soft);color:var(--bad)}.ic.warn{background:var(--warn-soft);color:var(--warn)}.ic.info{background:var(--info-soft);color:var(--info)}
.hero{background:var(--grad);color:#fff;border:0;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:rgba(255,255,255,.12)}
.hero::before{content:"";position:absolute;right:60px;bottom:-90px;width:180px;height:180px;border-radius:50%;background:rgba(255,255,255,.08)}
.hero h2{font-size:22px}.hero p{margin:6px 0 0;opacity:.85}
.hero .chip{background:rgba(255,255,255,.18);color:#fff}

/* controls */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 15px;border-radius:11px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-weight:550;cursor:pointer;transition:.15s;white-space:nowrap}
.btn:hover{border-color:var(--pri);color:var(--pri)}
.btn.p{background:var(--grad);border-color:transparent;color:#fff;box-shadow:0 6px 16px -6px rgba(91,91,240,.6)}
.btn.p:hover{filter:brightness(1.06);color:#fff}
.btn.d{color:var(--bad)}.btn.d:hover{border-color:var(--bad);color:var(--bad)}
.btn.s{padding:5px 10px;font-size:12.5px;border-radius:9px}
.btn.ico{padding:8px;width:38px;height:38px}
.btn:disabled{opacity:.55;cursor:not-allowed}
input,select,textarea{background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:9px 12px;min-width:0;outline:0;transition:.15s}
input:focus,select:focus,textarea:focus{border-color:var(--pri);box-shadow:0 0 0 3px var(--pri-soft)}
label.f{display:flex;flex-direction:column;gap:5px;font-size:12.5px;font-weight:550;color:var(--ink2)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end}
.row.c{align-items:center}.row.sb{justify-content:space-between}
.form{display:grid;gap:12px;grid-template-columns:minmax(0,1fr)}
.field-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
/* settings: cards packed in columns (no gaps under short cards), jump buttons on top */
.setg{columns:3 360px;column-gap:16px}
.setg>.card{break-inside:avoid;margin:0 0 16px;scroll-margin-top:84px}
.setnav{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.setnav .btn{font-size:13px}
.form label.row:has(>input[type=checkbox]){flex-wrap:nowrap;align-items:flex-start}
.form label.row>input[type=checkbox]{flex:none;width:auto;margin-top:3px}
.search{position:relative;flex:1;min-width:180px;max-width:340px}
.search svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--mute)}
.search input{width:100%;padding-left:36px}
.kbd{font-size:11px;border:1px solid var(--line);border-radius:6px;padding:1px 6px;color:var(--mute);background:var(--surface2)}

/* table */
.tw{overflow-x:auto}
table{width:100%;border-collapse:collapse}
th{text-align:left;font-size:11.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--mute);font-weight:600;padding:10px 12px;border-bottom:1px solid var(--line);white-space:nowrap}
td{padding:12px;border-bottom:1px solid var(--line);vertical-align:middle}
tbody tr:last-child td,table tr:last-child td{border-bottom:0}
tbody tr:hover td{background:var(--surface2)}
td.act{text-align:right;white-space:nowrap}
.who{display:flex;align-items:center;gap:11px;min-width:0}
.sid,.who .sid,.usercard .sid{display:inline-block;padding:2px 10px;border-radius:8px;background:var(--sid-bg);color:var(--sid-tx);font:700 14px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.05em;white-space:nowrap;vertical-align:middle}
.hero .sid{background:#fff;color:#312e81}
/* the student ID sits above the name wherever the two appear together */
.who>div:has(>.sid),.usercard>div:has(>.sid),.grow:has(>.sid){display:flex;flex-direction:column;align-items:flex-start;gap:3px}
.who>div>.sid,.usercard>div>.sid,.grow>.sid{order:-1}
.who>div:has(>.sid)>b,.usercard>div:has(>.sid)>b,.grow:has(>.sid)>b{margin:0;max-width:100%}.grow:has(>.sid)>.bar{align-self:stretch}
.who b{display:block;font-size:12.5px;font-weight:500;color:var(--ink2);margin-bottom:2px}.who h3{font-size:15px;font-weight:600;margin-bottom:3px!important}.who span{font-size:12px;color:var(--mute)}
.av{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:650;font-size:13px;flex:none;background:var(--grad)}
.av.lg{width:64px;height:64px;font-size:22px}
.chip{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:99px;font-size:12px;font-weight:600;background:var(--surface2);color:var(--ink2);border:1px solid transparent}
.chip.ok{background:var(--ok-soft);color:var(--ok)}.chip.bad{background:var(--bad-soft);color:var(--bad)}.chip.warn{background:var(--warn-soft);color:var(--warn)}.chip.pri{background:var(--pri-soft);color:var(--pri)}.chip.info{background:var(--info-soft);color:var(--info)}
.badge{min-width:20px;height:20px;padding:0 6px;border-radius:99px;background:var(--bad);color:#fff;font-size:11px;font-weight:700;display:inline-grid;place-items:center}
.bar{height:8px;border-radius:99px;background:var(--surface2);overflow:hidden;border:1px solid var(--line)}
.bar i{display:block;height:100%;border-radius:99px;background:var(--grad)}
.bar.ok i{background:var(--ok)}.bar.bad i{background:var(--bad)}.bar.warn i{background:var(--warn)}
.empty{text-align:center;color:var(--mute);padding:36px 12px}
.empty svg{width:34px;height:34px;opacity:.5;margin-bottom:6px}
.list-i{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
.list-i:last-child{border-bottom:0}.list-i .grow{flex:1;min-width:0}

/* segmented attendance control */
.seg{display:inline-flex;background:var(--surface2);border:1px solid var(--line);border-radius:11px;padding:3px;gap:2px}
.seg label{padding:5px 13px;border-radius:8px;cursor:pointer;font-weight:600;font-size:12.5px;color:var(--ink2);transition:.12s}
.seg input{display:none}
.seg label:has(input:checked){color:#fff;background:var(--pri)}
.seg label.P:has(input:checked){background:var(--ok)}.seg label.A:has(input:checked){background:var(--bad)}.seg label.L:has(input:checked){background:var(--warn)}

/* calendar */
.cal{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}
.cal .dow{font-size:11px;color:var(--mute);text-align:center;font-weight:600;text-transform:uppercase}
.cal .d{aspect-ratio:1;border-radius:10px;display:grid;place-items:center;font-weight:600;font-size:13px;background:var(--surface2);color:var(--mute);position:relative}
.cal .d.P{background:var(--ok-soft);color:var(--ok)}.cal .d.A{background:var(--bad-soft);color:var(--bad)}.cal .d.L{background:var(--warn-soft);color:var(--warn)}
.cal .d.today{outline:2px solid var(--pri);outline-offset:1px}.cal .d.x{background:transparent}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--mute)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px;vertical-align:-1px}

/* ring */
.ring{--p:0;width:92px;height:92px;border-radius:50%;background:conic-gradient(var(--c,var(--pri)) calc(var(--p)*1%),var(--surface2) 0);display:grid;place-items:center;flex:none}
.ring::before{content:"";width:72px;height:72px;border-radius:50%;background:var(--surface)}
.ring b{position:absolute;font-size:17px;letter-spacing:-.02em}
.ringw{position:relative;display:grid;place-items:center}

/* overlays */
dialog{border:1px solid var(--line);border-radius:20px;background:var(--surface);color:var(--ink);padding:0;box-shadow:var(--shadow-lg);width:min(480px,94vw);max-height:90vh}
dialog::backdrop{background:rgba(10,12,24,.5);backdrop-filter:blur(3px)}
dialog[open]{animation:pop .18s ease}
@keyframes pop{from{opacity:0;transform:scale(.97) translateY(8px)}}
.dlg{padding:22px;overflow:auto;max-height:90vh}.dlg h3{font-size:18px;margin-bottom:14px}
dialog.wide{width:min(720px,94vw);overflow:hidden}
dialog.pal{width:min(560px,94vw);margin-top:12vh;border-radius:18px}
.pal input{width:100%;border:0;border-bottom:1px solid var(--line);border-radius:0;padding:16px 18px;font-size:16px}
.pal input:focus{box-shadow:none}
.pal .res{max-height:50vh;overflow:auto;padding:8px}
.pal .res a{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;color:var(--ink);cursor:pointer}
.pal .res a:hover,.pal .res a.sel{background:var(--pri-soft);color:var(--pri)}
.pal .res h6{margin:8px 12px 4px;font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--mute)}
#toast{position:fixed;bottom:22px;right:22px;z-index:99;display:grid;gap:8px}
.toast{background:var(--ink);color:var(--bg);padding:11px 16px;border-radius:12px;box-shadow:var(--shadow-lg);animation:pop .2s;font-weight:550}
.toast.err{background:var(--bad);color:#fff}

/* auth */
.auth{min-height:100vh;display:grid;grid-template-columns:1.1fr 1fr}
.auth-art{background:var(--grad);color:#fff;padding:48px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.auth-art::before,.auth-art::after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.1)}
.auth-art::before{width:420px;height:420px;right:-140px;top:-120px}.auth-art::after{width:300px;height:300px;left:-90px;bottom:-110px}
.auth-art h1{font-size:38px;line-height:1.15;max-width:420px;position:relative}
.auth-art p{opacity:.85;max-width:400px;position:relative}
.auth-art ul{list-style:none;padding:0;margin:20px 0 0;display:grid;gap:10px;position:relative}
.auth-art li{display:flex;gap:10px;align-items:center;opacity:.95}
.auth-form{display:grid;place-items:center;padding:32px}
.auth-form form{width:min(380px,100%);display:grid;gap:14px}
.auth-form h2{font-size:26px}
.auth-form .logo{margin-bottom:6px}

/* mobile tab bar (student) */
.tabbar{display:none}
.skeleton{background:linear-gradient(90deg,var(--surface2),var(--line),var(--surface2));background-size:200% 100%;animation:sk 1.2s infinite;border-radius:10px;height:18px}
@keyframes sk{to{background-position:-200% 0}}
canvas{max-width:100%}
.slip{display:grid;grid-template-columns:180px minmax(0,1fr);gap:18px;align-items:start}
.bankbox{border:1px dashed var(--pri);background:var(--pri-soft);border-radius:14px;padding:14px 16px}
.bankbox .row{padding:4px 0}
.bankp{display:grid;gap:10px}
.paybox{padding:6px 16px;border:1px dashed var(--pri);background:var(--pri-soft);border-radius:14px;font-size:14px}
.paybox>div{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 0;min-width:0}
.paybox>div+div{border-top:1px solid var(--line)}
.paybox span{color:var(--mute);flex:none}
.paybox b{text-align:right;overflow-wrap:anywhere}
.paybox .acc b{font-size:17px;letter-spacing:.04em;margin-left:auto}
.copy{flex:none;display:inline-flex;align-items:center;gap:6px;padding:6px 11px;border-radius:9px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;font-size:13px;font-weight:600;cursor:pointer}
.copy svg{width:15px;height:15px}.copy em{font-style:normal}
.copy.on{border-color:#16a34a;color:#16a34a}
@media(max-width:520px){.paybox .acc{flex-wrap:wrap}.paybox .acc span{width:100%}.paybox .acc b{flex:1;margin-left:0;text-align:left;white-space:nowrap}}
@media(max-width:600px){.slip{grid-template-columns:1fr}.slip>a{max-width:220px}}

/* student login */
.sl{--surface:rgba(6,11,29,.55);--ink:#e8edf9;--ink2:#cdd6ee;--mute:#93a0bf;--line:rgba(255,255,255,.12);--cy:#22d3ee;--pri-soft:rgba(34,211,238,.18);--sl-grad:linear-gradient(135deg,#22d3ee,#8b5cf6 55%,#f472b6);color-scheme:dark;min-height:100vh;color:var(--ink);font:16px/1.55 Outfit,system-ui,sans-serif;background:radial-gradient(700px 500px at 8% -5%,rgba(34,211,238,.17),transparent 70%),radial-gradient(800px 600px at 100% 100%,rgba(139,92,246,.22),transparent 70%),#060b1d}
.sl-w{width:min(1080px,100% - 32px);margin:auto;min-height:100vh;padding:40px 0;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);grid-template-rows:auto auto;column-gap:72px;row-gap:32px;align-content:center}
.sl-intro,.sl-tiles{grid-column:1}.sl-card{grid-column:2;grid-row:1/3;align-self:center}
.sl-brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--ink);margin-bottom:40px}
.sl-brand i{width:38px;height:38px;flex:none;border-radius:11px;background:var(--sl-grad);display:grid;place-items:center;color:#fff}
.sl-k{font:500 13px 'JetBrains Mono',monospace;color:var(--cy);letter-spacing:.12em;text-transform:uppercase}
.sl h1{font-size:clamp(34px,4.6vw,54px);line-height:1.08;font-weight:800;letter-spacing:-.03em;margin:12px 0 14px;background:linear-gradient(120deg,#fff 30%,#a5b4fc 70%,#f0abfc);-webkit-background-clip:text;background-clip:text;color:transparent}
.sl-intro p{color:var(--mute);max-width:440px;margin:0}
.sl-tiles{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.sl-tiles li{display:flex;align-items:center;gap:11px;padding:14px;border:1px solid var(--line);border-radius:14px;background:rgba(255,255,255,.04);font-size:14.5px;font-weight:500;color:var(--ink2)}
.sl-tiles svg{color:var(--cy)}
.sl-card{background:rgba(255,255,255,.045);border:1px solid var(--line);border-radius:24px;padding:34px;box-shadow:0 30px 70px -30px rgba(0,0,0,.8);backdrop-filter:blur(10px)}
.sl-card form{display:grid;gap:16px}
.sl-card h2{font-size:27px;font-weight:700}
.sl-card .sub{color:var(--mute);margin:4px 0 0;font-size:15px}
.sl-f{display:grid;gap:6px;font-size:14px;font-weight:500;color:var(--ink2)}
.sl-in{position:relative;display:block}
.sl-in>svg{position:absolute;left:14px;top:15px;color:var(--mute);pointer-events:none}
.sl-in:focus-within>svg{color:var(--cy)}
.sl-in input{width:100%;min-height:50px;padding:11px 14px 11px 44px;border-radius:13px;font-size:16px}
.sl-in input:focus{border-color:var(--cy)}
.sl-in input::placeholder{color:#7f8bab}
.sl-in input:-webkit-autofill{-webkit-text-fill-color:var(--ink);box-shadow:0 0 0 40px #0b1530 inset;caret-color:var(--ink)}
.sl-in input.id{text-transform:uppercase;font-family:'JetBrains Mono',Consolas,monospace;letter-spacing:.03em}
.sl-in input.id::placeholder{text-transform:none;font-family:Outfit,system-ui,sans-serif;letter-spacing:0}
.sl-in input.pw{padding-right:68px}
.sl-show{position:absolute;right:6px;top:7px;height:36px;padding:0 10px;border:0;border-radius:9px;background:none;color:var(--cy);font-size:13.5px;font-weight:600;cursor:pointer}
.sl-err{display:none;padding:10px 13px;border-radius:12px;background:rgba(244,63,94,.12);border:1px solid rgba(244,63,94,.35);color:#fda4af;font-size:14.5px}
.sl-err.on{display:block}
.sl-go{min-height:52px;border:0;border-radius:14px;background:var(--sl-grad);color:#fff;font-size:17px;font-weight:700;cursor:pointer;box-shadow:0 14px 32px -14px rgba(139,92,246,.9);transition:filter .15s,transform .15s}
.sl-go:hover{filter:brightness(1.08);transform:translateY(-1px)}
.sl-go:focus-visible{outline:2px solid #fff;outline-offset:2px}
.sl-go:disabled{opacity:.6;cursor:wait;transform:none}
.sl-links{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 16px;font-size:14px;color:var(--mute)}
.sl-links a{color:var(--cy);font-weight:600}
.sl-done{width:60px;height:60px;border-radius:50%;display:grid;place-items:center;background:rgba(163,230,53,.14);border:1px solid rgba(163,230,53,.5);color:#a3e635}
@media(max-width:900px){
  .sl-w{grid-template-columns:minmax(0,1fr);grid-template-rows:none;padding:20px 0 32px;row-gap:22px;align-content:start}
  .sl-intro,.sl-tiles,.sl-card{grid-column:1;grid-row:auto}
  .sl-brand{margin-bottom:22px}
  .sl-intro p{display:none}
  .sl h1{font-size:clamp(30px,9vw,44px);margin-bottom:0}
}
@media(max-width:560px){.sl-card{padding:24px 18px;border-radius:20px}}
@media(max-width:1000px){.g-chat{grid-template-columns:minmax(0,1fr)}.g-main{grid-template-columns:1fr}.auth{grid-template-columns:1fr}.auth-art{display:none}}
@media(max-width:820px){
  .side{position:fixed;left:0;top:0;z-index:60;transform:translateX(-100%);transition:.2s;box-shadow:var(--shadow-lg)}
  .side.open{transform:none}
  .btn.menu-btn{display:inline-flex}
  .top{padding:12px 16px}.page{padding:16px 16px 90px}
  .field-2{grid-template-columns:1fr}
  .g2{grid-template-columns:1fr}
  .tabbar{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:30;background:var(--surface);border-top:1px solid var(--line);padding:6px 6px calc(6px + env(safe-area-inset-bottom))}
  .tabbar{overflow-x:auto}
  .tabbar a{flex:1 0 58px;position:relative;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 2px;font-size:11px;font-weight:600;color:var(--mute);border-radius:10px;cursor:pointer}
  .tabbar a.on{color:var(--pri);background:var(--pri-soft)}
  .hide-m{display:none!important}
}
@media print{
  .side,.top,.tabbar,.noprint,#toast{display:none!important}
  body{background:#fff}.page{padding:0;max-width:none}.card{box-shadow:none;border:1px solid #ccc}
  dialog{box-shadow:none;border:0;max-height:none}
}