/* Layout: a card catalogue — grade drawers across the top, subject spines on a shelf, lessons as index rows with call numbers. */
:root{
  --bg:#F4F5F1; --surface:#FFFFFF; --surface-2:#EBEDE6; --ink:#1A2522; --ink-2:#55625C; --line:#D6DBD1;
  --accent:#2B5BD7; --accent-ink:#FFFFFF; --accent-soft:#E2E9FB;
  --ok:#23663F; --ok-soft:#DFF0E5; --warn:#9A5F0C; --warn-soft:#F7EAD2; --bad:#B3372A; --bad-soft:#F7DFDA;
  --shelf:#C9B89A; --shadow:0 1px 2px rgba(20,30,25,.06),0 6px 18px rgba(20,30,25,.06);
  --slide-bg:#FFFDF7; --slide-ink:#1E2A40; --slide-ink-2:#4F5B73; --slide-accent:#2B5BD7; --slide-line:#E9E2D2;
  --f-body:'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --f-mono:'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --r:10px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#111614; --surface:#19201D; --surface-2:#222B27; --ink:#E5ECE8; --ink-2:#A3B0A9; --line:#33403A;
  --accent:#86A8FF; --accent-ink:#0D1530; --accent-soft:#1E2A48;
  --ok:#72C595; --ok-soft:#17301F; --warn:#E5B266; --warn-soft:#382A12; --bad:#F2907F; --bad-soft:#3B1D18;
  --shelf:#5A4E3A; --shadow:0 1px 2px rgba(0,0,0,.3),0 6px 18px rgba(0,0,0,.25); color-scheme:dark }}
:root[data-theme="dark"]{
  --bg:#111614; --surface:#19201D; --surface-2:#222B27; --ink:#E5ECE8; --ink-2:#A3B0A9; --line:#33403A;
  --accent:#86A8FF; --accent-ink:#0D1530; --accent-soft:#1E2A48;
  --ok:#72C595; --ok-soft:#17301F; --warn:#E5B266; --warn-soft:#382A12; --bad:#F2907F; --bad-soft:#3B1D18;
  --shelf:#5A4E3A; --shadow:0 1px 2px rgba(0,0,0,.3),0 6px 18px rgba(0,0,0,.25); color-scheme:dark }
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:15px;line-height:1.5;margin:0}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--surface)}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
a{color:var(--accent)}
h1,h2,h3,h4{margin:0;text-wrap:balance;line-height:1.25}
p{margin:0}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.muted{color:var(--ink-2)}
.wrap{max-width:1240px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
/* top bar */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--surface);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:14px;padding-block:10px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand .mark{width:34px;height:34px;border-radius:8px;background:var(--ink);color:var(--surface);display:grid;place-items:center;font-weight:800;font-size:13px;letter-spacing:.5px;flex:none}
.brand b{font-size:16px;font-weight:800;letter-spacing:-.2px;white-space:nowrap}
.brand small{display:block;font-size:11.5px;color:var(--ink-2);white-space:nowrap}
.search{flex:1 1 220px;min-width:0;display:flex}
.search input{width:100%;border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:8px 14px}
.who{display:flex;align-items:center;gap:8px;margin-left:auto}
.who img{width:30px;height:30px;border-radius:50%}
.who select{border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:4px 6px;font-size:13px}
.rolechip{font-size:12px;font-weight:700;padding:3px 9px;border-radius:999px;background:var(--accent-soft);color:var(--accent);white-space:nowrap}
.nav{border-top:1px solid var(--line);overflow-x:auto}
.nav .wrap{display:flex;gap:4px;padding-block:0}
.nav button{border:0;background:none;padding:10px 12px;font-weight:600;color:var(--ink-2);border-bottom:2.5px solid transparent;white-space:nowrap;display:flex;gap:6px;align-items:center}
.nav button[aria-current="page"]{color:var(--ink);border-bottom-color:var(--accent)}
.badge{font-size:11px;font-weight:800;min-width:18px;height:18px;border-radius:9px;padding:0 5px;background:var(--bad);color:var(--surface);display:inline-grid;place-items:center}
main{padding-block:22px 80px}
.banner{border:1px dashed var(--warn);background:var(--warn-soft);color:var(--ink);border-radius:var(--r);padding:10px 14px;margin-bottom:16px;font-size:14px}
/* generic */
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.col{display:flex;flex-direction:column;gap:10px}
.grow{flex:1;min-width:0}
.btn{border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:7px 13px;font-weight:600;font-size:14px;display:inline-flex;align-items:center;gap:6px;text-decoration:none;color:var(--ink);white-space:nowrap}
.btn:hover{border-color:var(--ink-2)}
.btn.pri{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.ok{background:var(--ok);border-color:var(--ok);color:var(--surface)}
.btn.bad{color:var(--bad);border-color:var(--bad)}
.btn.ghost{border-color:transparent;background:transparent}
.btn.sm{padding:4px 9px;font-size:13px}
.btn:disabled{opacity:.5;cursor:not-allowed}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r)}
.pad{padding:16px}
.sec-h{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.sec-h h2{font-size:22px;font-weight:800;letter-spacing:-.3px}
.sec-h h3{font-size:17px;font-weight:700}
.eyebrow{font-size:11.5px;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;color:var(--ink-2)}
.chip{font-size:12px;font-weight:700;padding:2px 8px;border-radius:999px;background:var(--surface-2);color:var(--ink-2);white-space:nowrap;display:inline-flex;align-items:center;gap:4px}
.st-draft{background:var(--surface-2);color:var(--ink-2)}
.st-pending{background:var(--warn-soft);color:var(--warn)}
.st-changes{background:var(--warn-soft);color:var(--warn)}
.st-approved{background:var(--ok-soft);color:var(--ok)}
.st-blocked{background:var(--bad-soft);color:var(--bad)}
.sev-1{background:var(--surface-2);color:var(--ink-2)}
.sev-2{background:var(--warn-soft);color:var(--warn)}
.sev-3{background:var(--bad-soft);color:var(--bad)}
.empty{border:1px dashed var(--line);border-radius:var(--r);padding:22px;color:var(--ink-2);text-align:left;background:var(--surface)}
.empty b{color:var(--ink);display:block;margin-bottom:4px}
label.f{display:flex;flex-direction:column;gap:4px;font-size:13px;font-weight:600;color:var(--ink-2)}
label.f input,label.f select,label.f textarea,.inp{border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:8px 10px;font-size:14px;color:var(--ink);font-weight:400;width:100%}
textarea{resize:vertical}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:16px;overflow-x:auto}
.tabs button{border:0;background:none;padding:8px 12px;font-weight:600;color:var(--ink-2);border-bottom:2px solid transparent;white-space:nowrap}
.tabs button[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--ink)}
.stars{color:#D69A12;letter-spacing:1px}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:12px;letter-spacing:.6px;text-transform:uppercase;color:var(--ink-2);font-weight:700;background:var(--surface-2);white-space:nowrap}
tr:last-child td{border-bottom:0}
/* library: grade drawers */
.drawers{display:flex;gap:18px;overflow-x:auto;padding-bottom:4px;margin-bottom:18px}
.dgroup{display:flex;flex-direction:column;gap:6px}
.dgroup .eyebrow{padding-left:2px}
.dgroup .dd{display:flex;gap:6px}
.drawer{border:1px solid var(--line);background:var(--surface);border-radius:8px;min-width:54px;padding:6px 8px 7px;text-align:center;line-height:1.1}
.drawer small{display:block;font-size:10.5px;color:var(--ink-2);font-weight:600}
.drawer b{font-size:20px;font-weight:800}
.drawer[aria-pressed="true"]{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.drawer[aria-pressed="true"] small{color:inherit;opacity:.75}
/* shelf of spines */
.shelf{display:flex;align-items:flex-end;gap:7px;flex-wrap:wrap;padding:14px 14px 0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r) var(--r) 0 0;border-bottom:0}
.shelf-base{height:12px;background:var(--shelf);border-radius:0 0 6px 6px;margin-bottom:22px}
.spine{--c:#555;border:0;background:var(--c);color:#fff;width:66px;border-radius:5px 5px 2px 2px;padding:10px 6px 8px;display:flex;flex-direction:column;align-items:center;justify-content:space-between;gap:8px;box-shadow:inset -6px 0 0 rgba(0,0,0,.12),inset 3px 0 0 rgba(255,255,255,.12);transition:transform .15s}
.spine:hover{transform:translateY(-4px)}
.spine[aria-pressed="true"]{transform:translateY(-10px);outline:3px solid var(--ink);outline-offset:2px}
.spine .ab{font-family:var(--f-mono);font-size:12px;font-weight:600;background:rgba(255,255,255,.2);border-radius:4px;padding:1px 5px}
.spine .nm{writing-mode:vertical-rl;transform:rotate(180deg);font-weight:700;font-size:13.5px;line-height:1.15;max-height:190px;text-align:left}
.spine .ct{font-size:11px;font-weight:700;opacity:.9;font-variant-numeric:tabular-nums}
@media (max-width:640px){.shelf{flex-wrap:nowrap;overflow-x:auto}.spine{flex:none;width:58px}.spine .nm{max-height:150px;font-size:12.5px}}
.spine.opt{opacity:.92;background-image:repeating-linear-gradient(135deg,rgba(255,255,255,.08) 0 6px,transparent 6px 12px)}
/* lessons */
.lib{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.25fr);gap:18px;align-items:start}
@media (max-width:900px){.lib{grid-template-columns:1fr}}
.lessons .chap{font-size:12.5px;font-weight:700;color:var(--ink-2);padding:12px 14px 6px;border-top:1px solid var(--line)}
.lessons .chap:first-child{border-top:0}
.lrow{display:flex;gap:10px;align-items:center;width:100%;border:0;background:none;text-align:left;padding:8px 14px;border-left:3px solid transparent}
.lrow:hover{background:var(--surface-2)}
.lrow[aria-pressed="true"]{background:var(--accent-soft);border-left-color:var(--accent)}
.lrow .num{font-family:var(--f-mono);font-size:12.5px;color:var(--ink-2);width:64px;flex:none}
.lrow .t{flex:1;min-width:0;font-weight:600}
.lrow .cnt{display:flex;gap:4px}
.cnt span{font-family:var(--f-mono);font-size:11.5px;border:1px solid var(--line);border-radius:4px;padding:0 5px;color:var(--ink-2)}
.cnt span.on{border-color:var(--ink);color:var(--ink)}
.cnt span{min-width:3.4em;text-align:center}
.lrow.lhead{cursor:default;background:transparent;border-bottom:1px solid var(--line);font-size:12px;font-weight:700;color:var(--ink-2);text-transform:uppercase;letter-spacing:.5px;background:var(--surface)}
.lrow.lhead:hover{background:var(--surface)}
.lrow.lhead .cnt span{border:0;font-family:inherit;font-size:11px;padding:0 5px;color:var(--ink-2)}
/* resource cards */
.rlist{display:flex;flex-direction:column;gap:10px}
.rcard{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface);text-align:left;width:100%}
.rcard:hover{border-color:var(--ink-2)}
.kindtag{width:46px;height:58px;border-radius:5px;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:10px;font-weight:800;letter-spacing:.6px;color:var(--surface)}
.kindtag b{font-size:18px;line-height:1}
.k-slides{background:var(--accent)}
.k-exercises{background:var(--ok)}
.rcard h4{font-size:15.5px;font-weight:700}
.rmeta{display:flex;gap:6px 12px;flex-wrap:wrap;font-size:12.5px;color:var(--ink-2);margin-top:4px;align-items:center}
.callno{font-family:var(--f-mono);font-size:12px;color:var(--ink-2)}
/* resource view */
.rhead{display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap;margin-bottom:16px}
.rhead h2{font-size:24px;font-weight:800;letter-spacing:-.3px}
.crumb{font-size:13px;color:var(--ink-2);margin-bottom:6px;display:flex;gap:6px;flex-wrap:wrap}
.crumb button{border:0;background:none;padding:0;color:var(--accent);font-weight:600}
.sgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.sbox{display:flex;flex-direction:column;gap:6px;min-width:0}
.sbar{display:flex;gap:4px;align-items:center;flex-wrap:wrap}
.sbar .grow{font-size:12.5px;color:var(--ink-2)}
/* slide */
.sw{container-type:inline-size;width:100%;min-width:0}
.slide{aspect-ratio:16/9;background:var(--slide-bg);color:var(--slide-ink);border:1px solid var(--slide-line);border-radius:8px;padding:4.5cqw 5.5cqw 4cqw;display:flex;flex-direction:column;gap:2.2cqw;position:relative;overflow:hidden;font-size:2.6cqw;line-height:1.35;max-width:100%}
.slide .s-top{display:flex;justify-content:space-between;align-items:center;font-size:1.9cqw;font-weight:700;color:var(--slide-ink-2)}
.s-lv{background:var(--c);color:#fff;padding:.3cqw 1.2cqw;border-radius:99px;letter-spacing:.1cqw}
.slide .s-title{font-size:4.6cqw;font-weight:800;letter-spacing:-.05cqw;color:var(--slide-ink)}
.slide .s-sub{font-size:2.8cqw;color:var(--slide-ink-2)}
.slide .s-text{font-size:2.7cqw}
.slide ul{margin:0;padding-left:3.4cqw;display:flex;flex-direction:column;gap:.9cqw}
.slide .s-emoji{font-size:7cqw;line-height:1}
.slide.L-title{justify-content:center;background:linear-gradient(160deg,var(--slide-bg) 55%,#F1E9D6)}
.slide.L-title .s-top{position:absolute;top:3cqw;left:5.5cqw;right:5.5cqw}
.slide.L-title .s-title{font-size:6.4cqw}
.slide.L-title{padding-top:8cqw}
.slide.L-title .s-emoji{font-size:7.5cqw}
.s-two{display:grid;grid-template-columns:1fr 1fr;gap:3cqw}
.s-two>div{background:#F4EFE3;border-radius:1.6cqw;padding:2cqw 2.4cqw}
.s-two h5{margin:0 0 1cqw;font-size:2.9cqw;color:var(--slide-accent)}
.s-opts{display:grid;grid-template-columns:1fr 1fr;gap:1.6cqw}
.s-opts div{border:.3cqw solid var(--slide-line);border-radius:1.4cqw;padding:1.3cqw 2cqw;background:#fff;font-weight:600}
.s-opts div.ans{border-color:#2C7A4C;background:#E6F3EA}
.s-opts b{color:var(--slide-accent);margin-right:1cqw}
.slide.L-activity{background:#F3F8F1}
.slide.L-summary{background:#F2F5FC}
.s-foot{margin-top:auto;font-size:1.7cqw;color:var(--slide-ink-2);display:flex;justify-content:space-between}
/* present overlay */
.present{position:fixed;inset:0;z-index:60;background:#0B0F0D;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:calc(12px + env(safe-area-inset-top,0px)) max(12px,env(safe-area-inset-right,0px)) calc(12px + env(safe-area-inset-bottom,0px)) max(12px,env(safe-area-inset-left,0px))}
.present .stage{width:min(100%,calc((100vh - 120px) * 16 / 9))}
.present .ctl{display:flex;gap:8px;align-items:center;color:#DDE3E0;flex-wrap:wrap;justify-content:center}
.present .ctl .btn{background:#1F2623;color:#E8EEEB;border-color:#3A4440}
.present .notes{max-width:900px;color:#C9D2CE;font-size:15px;background:#161C19;border-radius:8px;padding:10px 14px;max-height:22vh;overflow:auto}
/* exercises */
.items{display:flex;flex-direction:column;gap:10px}
.icard{padding:12px 14px}
.ihead{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:6px}
.ihead .id{font-family:var(--f-mono);font-size:12px;color:var(--ink-2)}
.iq{font-weight:600}
.iq .en{display:block;font-weight:500;color:var(--ink-2);font-style:italic}
.iopts{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.iopts span{border:1px solid var(--line);border-radius:6px;padding:3px 9px;font-size:14px}
.iopts span.ans{border-color:var(--ok);background:var(--ok-soft);color:var(--ok);font-weight:700}
.ihints{margin-top:8px;font-size:13.5px;color:var(--ink-2);display:flex;flex-direction:column;gap:2px}
.lv{font-size:11.5px;font-weight:800;padding:1px 7px;border-radius:4px;border:1px solid currentColor}
.lv1{color:var(--ok)}.lv2{color:var(--warn)}.lv3{color:var(--bad)}
.player{max-width:760px}
.pq{font-size:19px;font-weight:700}
.pic{font-size:44px;line-height:1.2}
.choice{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px;margin-top:12px}
.choice button{border:2px solid var(--line);background:var(--surface);border-radius:10px;padding:12px;font-size:17px;font-weight:600;text-align:left}
.choice button.sel{border-color:var(--accent);background:var(--accent-soft)}
.choice button.right{border-color:var(--ok);background:var(--ok-soft)}
.choice button.wrong{border-color:var(--bad);background:var(--bad-soft)}
.fb{margin-top:12px;padding:10px 14px;border-radius:8px;font-weight:600}
.fb.ok{background:var(--ok-soft);color:var(--ok)}
.fb.no{background:var(--bad-soft);color:var(--bad)}
.hintbox{margin-top:12px;display:flex;flex-direction:column;gap:6px}
.hintbox p{background:var(--warn-soft);border-radius:8px;padding:8px 12px;font-size:14.5px}
.tok{display:inline-flex;border:1.5px solid var(--line);background:var(--surface);border-radius:8px;padding:6px 10px;font-weight:600;margin:3px}
.tok.used{opacity:.35}
.seq{min-height:46px;border:1.5px dashed var(--line);border-radius:10px;padding:4px;margin-top:8px}
/* editor */
.ed{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(320px,1fr);gap:18px;align-items:start}
@media (max-width:980px){.ed{grid-template-columns:1fr}}
.chat{position:sticky;top:120px;display:flex;flex-direction:column;max-height:calc(100vh - 140px)}
@media (max-width:980px){.chat{position:static;max-height:none}}
.chat .log{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:10px;min-height:180px}
.msg{padding:9px 12px;border-radius:10px;font-size:14px;white-space:pre-wrap;max-width:92%}
.msg.u{background:var(--accent-soft);align-self:flex-end}
.msg.a{background:var(--surface-2);align-self:flex-start}
.msg.sys{background:none;border:1px dashed var(--line);color:var(--ink-2);font-size:13px;align-self:stretch;max-width:none}
.chat .box{border-top:1px solid var(--line);padding:10px;display:flex;flex-direction:column;gap:8px}
.chat textarea{min-height:76px}
.focuschips{display:flex;gap:4px;flex-wrap:wrap}
.quick{display:flex;gap:6px;flex-wrap:wrap}
.quick button{border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:3px 10px;font-size:12.5px}
.selbox{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px}
/* modal & toast */
.ov{position:fixed;inset:0;z-index:50;background:rgba(10,15,12,.45);display:flex;align-items:flex-start;justify-content:center;overflow-y:auto;padding:calc(40px + env(safe-area-inset-top,0px)) max(12px,env(safe-area-inset-right,0px)) 40px max(12px,env(safe-area-inset-left,0px))}
.modal{background:var(--surface);border-radius:12px;width:min(640px,100%);box-shadow:var(--shadow);display:flex;flex-direction:column}
.modal.wide{width:min(980px,100%)}
.modal header{display:flex;align-items:center;gap:10px;padding:14px 18px;border-bottom:1px solid var(--line)}
.modal header h3{font-size:17px;flex:1}
.modal .body{padding:16px 18px;display:flex;flex-direction:column;gap:12px}
.modal footer{display:flex;gap:8px;justify-content:flex-end;padding:12px 18px;border-top:1px solid var(--line);flex-wrap:wrap}
.toast{pointer-events:none;position:fixed;left:50%;transform:translateX(-50%);bottom:calc(20px + env(safe-area-inset-bottom,0px));z-index:70;background:var(--ink);color:var(--surface);padding:10px 16px;border-radius:10px;font-weight:600;font-size:14px;box-shadow:var(--shadow);max-width:calc(100vw - 32px)}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg label{border:1px solid var(--line);border-radius:999px;padding:4px 11px;font-size:13px;font-weight:600;color:var(--ink-2);cursor:pointer}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg label:has(input:checked){background:var(--ink);color:var(--surface);border-color:var(--ink)}
.seg label:has(input:focus-visible){outline:2px solid var(--accent)}
.rep{padding:12px 14px;display:flex;flex-direction:column;gap:6px}
.rep .loc{font-family:var(--f-mono);font-size:12.5px}
.rep blockquote{margin:0;border-left:3px solid var(--line);padding:2px 10px;color:var(--ink-2);font-size:14px}
.thread{display:flex;flex-direction:column;gap:4px;font-size:13.5px;border-top:1px dashed var(--line);padding-top:6px}
.dist{display:grid;grid-template-columns:auto 1fr auto;gap:4px 8px;align-items:center;font-size:12.5px;max-width:320px}
.dist i{display:block;height:7px;border-radius:4px;background:var(--surface-2);overflow:hidden}
.dist i b{display:block;height:100%;background:#D69A12}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-bottom:16px}
.kpi{padding:12px 14px}
.kpi b{display:block;font-size:24px;font-weight:800;font-variant-numeric:tabular-nums}
.kpi span{font-size:12.5px;color:var(--ink-2)}
.av{width:26px;height:26px;border-radius:50%;vertical-align:middle;flex:none}
.note{font-size:13px;color:var(--ink-2)}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* --- bản độc lập: đăng nhập, khung HTML, avatar chữ --- */
.login{min-height:100vh;display:grid;place-items:center;padding-block:40px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.login .card{width:min(440px,100%);padding:28px 26px;display:flex;flex-direction:column;gap:14px}
.login h1{font-size:24px;font-weight:800;letter-spacing:-.3px}
.login .mark{width:48px;height:48px;border-radius:10px;background:var(--ink);color:var(--surface);display:grid;place-items:center;font-weight:800}
.code-in{font-family:var(--f-mono);font-size:28px;letter-spacing:10px;text-align:center}
.frame{position:relative;width:100%;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff}
.frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.frame.r169{aspect-ratio:16/9}
.frame.tall{height:min(78vh,820px)}
.avl{width:26px;height:26px;border-radius:50%;display:inline-grid;place-items:center;font-size:11px;font-weight:800;color:#fff;flex:none}
.loading{color:var(--ink-2);padding:18px 0}
.err{border:1px solid var(--bad);background:var(--bad-soft);color:var(--bad);border-radius:var(--r);padding:10px 14px}

.dstrip{display:flex;flex-direction:column;gap:4px;max-height:340px;overflow:auto;border:1px solid var(--line);border-radius:12px;padding:6px}
.dslide{display:flex;align-items:center;gap:6px;border-radius:9px;padding:2px 4px}
.dslide.cur{background:var(--soft,rgba(0,0,0,.05))}
.dslide .dgo{flex:1;text-align:left;border:0;background:transparent;font:inherit;color:inherit;padding:6px;cursor:pointer;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dslide .dgo:hover{text-decoration:underline}
.dtools{gap:8px;border:1px solid var(--line);border-radius:12px;padding:10px}
.dtools .row{flex-wrap:wrap;gap:6px}
.dsave{background:#fff6d6;border-radius:9px;padding:8px 10px}
.dsave[hidden]{display:none}
.linkbtn{border:0;background:none;padding:0;font:inherit;color:inherit;text-decoration:underline;cursor:pointer}
.legal{text-align:center;margin-top:8px}
.legaltext{white-space:pre-wrap;max-height:60vh;overflow:auto;line-height:1.6}
.avbtn{border:0;background:none;padding:0;cursor:pointer;border-radius:50%;display:inline-flex}
.avbtn:focus-visible{outline:2px solid var(--pri,#2B55C4);outline-offset:2px}
.chip.ai{background:#efe7ff;color:#5a3aa8}
/* khả năng tiếp cận (WCAG 2.1 AA): tương phản chữ, vùng bấm tối thiểu 24px, không tràn ngang trên điện thoại */
.spine .ab{background:rgba(0,0,0,.3)}
.linkbtn{min-height:24px;padding:2px 0}
.crumb button{min-height:24px}
input[type=checkbox],input[type=radio]{width:20px;height:20px;flex:none}
.login .btn{white-space:normal;justify-content:center;text-align:center}
.tbl-wrap:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
/* màn hình rất hẹp (320–420px): ô chọn vai trò của quản trị co lại, không đẩy trang tràn ngang */
@media (max-width:420px){.who{min-width:0;flex-wrap:wrap;justify-content:flex-end;gap:6px}.who select{max-width:150px;min-width:0;text-overflow:ellipsis}.who .btn{padding:6px 9px}}
fieldset.f{border:0;padding:0;margin:0;display:flex;flex-direction:column;gap:6px}
fieldset.f legend{font-size:13px;font-weight:600;color:var(--ink-2);padding:0;margin-bottom:6px}
label.chk{display:inline-flex;align-items:center;gap:6px;min-height:32px;padding:4px 10px;border:1px solid var(--line);border-radius:999px;background:var(--surface);font-size:13px;cursor:pointer}
label.chk:has(input:checked){border-color:var(--accent);background:var(--accent-soft)}
.bar{height:8px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.bar i{display:block;height:100%;background:var(--accent)}