/* FIDTALK — modern aero design system */
:root{
  --bg:#F3F6FB; --card:#FFFFFF; --card2:#F8FAFD; --ink:#0B1631; --ink2:#334160; --muted:#5B6884; --line:#E3E9F2;
  --navy:#0B1B3F; --navy2:#13285A; --sky:#2F7BEF; --sky2:#5AA9FF; --skybg:#EAF2FF;
  --red:#E3264A; --redbg:#FDECEF; --ok:#12936A; --okbg:#E3F6EF; --warn:#C27C0E; --warnbg:#FFF4DE; --no:#D33A3A; --nobg:#FDECEC;
  --r:18px; --r2:12px; --sh:0 1px 2px rgba(11,27,63,.05),0 8px 24px -10px rgba(11,27,63,.16); --sh2:0 18px 40px -16px rgba(11,27,63,.35);
  --font:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --grad:linear-gradient(135deg,#0B1B3F 0%,#173A8A 55%,#2F7BEF 100%);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#070E1F; --card:#0F1A33; --card2:#13213F; --ink:#E8EEF9; --ink2:#C2CDE2; --muted:#8E9BB7; --line:#22304F;
  --skybg:#13284F; --redbg:#3A1520; --okbg:#0E2E24; --warnbg:#33260C; --nobg:#3A1717; --sky:#5AA0FF;
  --sh:0 1px 2px rgba(0,0,0,.3),0 8px 24px -10px rgba(0,0,0,.6); color-scheme:dark;}}
:root[data-theme="dark"]{
  --bg:#070E1F; --card:#0F1A33; --card2:#13213F; --ink:#E8EEF9; --ink2:#C2CDE2; --muted:#8E9BB7; --line:#22304F;
  --skybg:#13284F; --redbg:#3A1520; --okbg:#0E2E24; --warnbg:#33260C; --nobg:#3A1717; --sky:#5AA0FF;
  --sh:0 1px 2px rgba(0,0,0,.3),0 8px 24px -10px rgba(0,0,0,.6); color-scheme:dark;}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--sky)}
button{font:inherit;color:inherit}
h1,h2,h3{line-height:1.2;letter-spacing:-.01em;margin:0}
.sr{position:absolute!important;left:-9999px}
:focus-visible{outline:3px solid var(--sky2);outline-offset:2px;border-radius:8px}

/* ---------- auth screen ---------- */
.auth{min-height:100vh;display:grid;grid-template-columns:1.1fr 1fr}
.auth-hero{background:var(--grad);color:#fff;padding:48px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.auth-hero h1{font-size:clamp(30px,3.6vw,46px);font-weight:800;max-width:14ch;margin:24px 0 14px}
.auth-hero p{color:#CFE0FF;max-width:42ch;font-size:17px;margin:0}
.auth-hero .pills{display:flex;gap:8px;flex-wrap:wrap;margin-top:22px}
.auth-hero .pill{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);padding:6px 12px;border-radius:99px;font-size:13.5px;font-weight:600}
.auth-hero svg.plane{position:absolute;right:-60px;bottom:40px;width:min(560px,70%);opacity:.95}
.auth-main{display:flex;align-items:center;justify-content:center;padding:32px 20px}
.auth-card{width:100%;max-width:420px}
.auth-card h2{font-size:28px;font-weight:800;margin-bottom:6px}
.auth-card .lead{color:var(--muted);margin:0 0 22px}
.seg{display:flex;background:var(--card2);border:1px solid var(--line);border-radius:12px;padding:4px;margin:0 0 20px}
.seg button{flex:1;border:0;background:none;padding:9px;border-radius:9px;font-weight:700;color:var(--muted);cursor:pointer}
.seg button[aria-selected="true"]{background:var(--card);color:var(--ink);box-shadow:var(--sh)}
@media (max-width:860px){.auth{grid-template-columns:1fr}.auth-hero{padding:28px 22px 30px;min-height:auto}.auth-hero h1{margin:16px 0 8px}.auth-hero svg.plane{display:none}.auth-hero .pills{display:none}}

/* ---------- brand ---------- */
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:.3px;color:inherit;text-decoration:none}
.brand .mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#E3264A,#FF6A80);display:grid;place-items:center;box-shadow:0 6px 14px -6px rgba(227,38,74,.7)}
.brand .mark svg{width:20px;height:20px}
.brand b{color:#FF6A80;font-weight:800}
.brand small{display:block;font-size:11.5px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;opacity:.7;margin-top:-2px}

/* ---------- app shell ---------- */
.shell{display:grid;grid-template-columns:260px minmax(0,1fr);min-height:100vh}
.side{background:var(--navy);color:#fff;padding:22px 16px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:22px}
.nav{display:flex;flex-direction:column;gap:4px}
.nav a{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:12px;color:#B9C8E6;text-decoration:none;font-weight:600;font-size:15px;position:relative}
.nav a svg{width:20px;height:20px;flex:none}
.nav a:hover{background:rgba(255,255,255,.06);color:#fff}
.nav a[aria-current="page"]{background:linear-gradient(90deg,rgba(47,123,239,.35),rgba(47,123,239,.08));color:#fff}
.nav a[aria-current="page"]::before{content:"";position:absolute;left:-16px;top:10px;bottom:10px;width:4px;border-radius:0 4px 4px 0;background:var(--sky2)}
.badge{margin-left:auto;background:var(--red);color:#fff;font-size:11.5px;font-weight:800;min-width:20px;height:20px;border-radius:99px;display:inline-grid;place-items:center;padding:0 6px}
.side .me{margin-top:auto;display:flex;align-items:center;gap:10px;padding:10px;border-radius:14px;background:rgba(255,255,255,.06);color:#fff;text-decoration:none}
.side .me .nm{font-weight:700;font-size:14px;line-height:1.2}
.side .me .em{font-size:12px;color:#9FB0D2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:150px}
.main{min-width:0;display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;gap:12px;padding:18px 32px;position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px)}
.topbar h1{font-size:22px;font-weight:800}
.topbar .sp{flex:1}
.topbar .mob-brand{display:none}
.content{padding:6px 32px 60px;max-width:1180px;width:100%}
.tabbar{display:none}
.av{border-radius:50%;object-fit:cover;flex:none;display:inline-block}
.av-i{display:inline-grid;place-items:center;background:linear-gradient(135deg,#2F7BEF,#7FB8FF);color:#fff;font-weight:800}
.iconbtn{border:1px solid var(--line);background:var(--card);border-radius:12px;width:42px;height:42px;display:grid;place-items:center;cursor:pointer;position:relative;color:var(--ink)}
.iconbtn svg{width:20px;height:20px}
.iconbtn .dot{position:absolute;top:7px;right:8px;width:9px;height:9px;border-radius:50%;background:var(--red);border:2px solid var(--card)}
@media (max-width:960px){
  .shell{grid-template-columns:1fr}
  .side{display:none}
  .topbar{padding:12px 16px;background:var(--navy);color:#fff;position:sticky}
  .topbar h1{display:none}
  .topbar .mob-brand{display:flex}
  .topbar .iconbtn{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.16);color:#fff}
  .topbar .iconbtn .dot{border-color:var(--navy)}
  .content{padding:16px 16px 100px}
  .tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:20;background:var(--card);border-top:1px solid var(--line);padding:6px 6px calc(6px + env(safe-area-inset-bottom));justify-content:space-around}
  .tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 2px;color:var(--muted);text-decoration:none;font-size:11.5px;font-weight:700;border-radius:10px;position:relative}
  .tabbar a svg{width:22px;height:22px}
  .tabbar a[aria-current="page"]{color:var(--sky)}
  .tabbar .badge{position:absolute;top:0;left:calc(50% + 4px);margin:0;height:18px;min-width:18px;font-size:10.5px}
  .page-title{display:block!important}
}
.page-title{display:none;font-size:24px;font-weight:800;margin:0 0 14px}

/* ---------- cards & layout ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--sh)}
.card h2{font-size:18px;font-weight:800;margin-bottom:12px}
.card h3{font-size:16px;font-weight:800}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(min(100%,150px),1fr))}
.stack>*+*{margin-top:18px}
.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.between{justify-content:space-between}
.muted{color:var(--muted)}
.small{font-size:14px}
.tiny{font-size:12.5px}
.hr{height:1px;background:var(--line);margin:16px 0;border:0}
.empty{text-align:center;padding:34px 18px;color:var(--muted)}
.empty svg{width:46px;height:46px;opacity:.5;margin-bottom:6px}

/* hero / welcome */
.hero{background:var(--grad);color:#fff;border-radius:22px;padding:26px 28px;position:relative;overflow:hidden;box-shadow:var(--sh2)}
.hero h2{font-size:clamp(22px,3vw,30px);font-weight:800;margin:0 0 4px}
.hero p{color:#D3E2FF;margin:0;max-width:56ch}
.hero .av{border:3px solid rgba(255,255,255,.35)}
.hero .bg-plane{position:absolute;right:-20px;top:-6px;width:280px;opacity:.16;pointer-events:none}

/* stats */
.stat{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 18px;box-shadow:var(--sh)}
.stat .v{font-size:26px;font-weight:800;letter-spacing:-.02em}
.stat .l{color:var(--muted);font-size:13.5px;font-weight:600}
.stat .ic{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:var(--skybg);color:var(--sky);margin-bottom:10px}
.stat .ic svg{width:19px;height:19px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;font-size:15px;padding:11px 18px;border-radius:12px;border:0;background:var(--sky);color:#fff;cursor:pointer;min-height:44px;text-decoration:none;transition:transform .08s,filter .15s;white-space:nowrap}
.btn:hover{filter:brightness(1.06)}
.btn:active{transform:translateY(1px)}
.btn svg{width:18px;height:18px}
.btn.navy{background:var(--navy)}
.btn.red{background:var(--red)}
.btn.ok{background:var(--ok)}
.btn.ghost{background:var(--card);color:var(--ink);border:1.5px solid var(--line)}
.btn.soft{background:var(--skybg);color:var(--sky)}
.btn.wide{width:100%}
.btn.sm{padding:7px 12px;min-height:36px;font-size:14px;border-radius:10px}
.btn:disabled{opacity:.55;cursor:not-allowed}
.link{border:0;background:none;color:var(--sky);font-weight:700;cursor:pointer;padding:0;text-decoration:underline;text-underline-offset:3px}

/* forms */
.field{margin:0 0 14px}
.field label,.flabel{display:block;font-weight:700;font-size:14px;margin:0 0 6px;color:var(--ink2)}
.input,select.input,textarea.input{width:100%;font:inherit;font-size:16px;padding:11px 13px;border:1.5px solid var(--line);border-radius:12px;background:var(--card2);color:var(--ink);min-height:46px}
textarea.input{min-height:90px;resize:vertical}
.input:focus{outline:none;border-color:var(--sky);box-shadow:0 0 0 4px color-mix(in srgb,var(--sky) 18%,transparent)}
.msg{padding:11px 14px;border-radius:12px;margin:0 0 14px;font-weight:600;font-size:15px}
.msg.ok{background:var(--okbg);color:var(--ok)}
.msg.no{background:var(--nobg);color:var(--no)}
.msg.info{background:var(--skybg);color:var(--sky)}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:800;padding:4px 10px;border-radius:99px;background:var(--card2);color:var(--muted);border:1px solid var(--line);white-space:nowrap}
.chip.ok{background:var(--okbg);color:var(--ok);border-color:transparent}
.chip.warn{background:var(--warnbg);color:var(--warn);border-color:transparent}
.chip.no{background:var(--nobg);color:var(--no);border-color:transparent}
.chip.sky{background:var(--skybg);color:var(--sky);border-color:transparent}

/* progress */
.bar{height:8px;background:var(--card2);border:1px solid var(--line);border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--sky),var(--sky2));border-radius:99px}
.ring{--p:0;width:64px;height:64px;border-radius:50%;background:conic-gradient(var(--sky) calc(var(--p)*1%),var(--card2) 0);display:grid;place-items:center;flex:none}
.ring span{width:50px;height:50px;border-radius:50%;background:var(--card);display:grid;place-items:center;font-weight:800;font-size:14px}
.ring.big{width:150px;height:150px}.ring.big span{width:122px;height:122px;font-size:34px}

/* course cards */
.ccard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--sh);display:flex;flex-direction:column}
.ccard .top{padding:18px 20px;color:#fff;display:flex;gap:14px;align-items:center;min-height:96px;position:relative;overflow:hidden}
.ccard .top h3{font-size:17px;font-weight:800;line-height:1.25}
.ccard .top .ico{width:46px;height:46px;border-radius:14px;background:rgba(255,255,255,.18);display:grid;place-items:center;flex:none}
.ccard .top .ico svg{width:24px;height:24px}
.ccard .body{padding:16px 20px 20px;display:flex;flex-direction:column;gap:12px;flex:1}
.t-blue{background:linear-gradient(135deg,#0B1B3F,#2F7BEF)} .t-teal{background:linear-gradient(135deg,#064E5A,#14A3A3)}
.t-violet{background:linear-gradient(135deg,#2A1460,#7C4DFF)} .t-red{background:linear-gradient(135deg,#5B0C20,#E3264A)}
.t-amber{background:linear-gradient(135deg,#5A3200,#E89B12)} .t-green{background:linear-gradient(135deg,#0B3D2A,#1FA36E)} .t-sky{background:linear-gradient(135deg,#0B3A63,#3BA3F5)}

/* module list */
.mlist{list-style:none;margin:0;padding:0}
.mlist li{border-top:1px solid var(--line)}
.mlist li:first-child{border-top:0}
.mlist button{width:100%;display:flex;align-items:center;gap:14px;background:none;border:0;padding:13px 4px;text-align:left;cursor:pointer;color:var(--ink)}
.mlist button:hover .t{color:var(--sky)}
.mlist .n{width:34px;height:34px;border-radius:10px;background:var(--skybg);color:var(--sky);font-weight:800;display:grid;place-items:center;flex:none;font-size:14px}
.mlist .done .n{background:var(--okbg);color:var(--ok)}
.mlist .t{font-weight:700;flex:1;font-size:15px}
.mlist .s{color:var(--muted);font-size:13px;font-weight:700;white-space:nowrap}

/* boarding pass (class) */
.pass{display:grid;grid-template-columns:minmax(0,1fr) auto;background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh);overflow:hidden}
.pass .l{padding:18px 20px;position:relative}
.pass .r{padding:18px 20px;border-left:2px dashed var(--line);display:flex;flex-direction:column;justify-content:center;align-items:center;gap:8px;min-width:150px;background:var(--card2)}
.pass .when{font-size:28px;font-weight:800;letter-spacing:-.02em;line-height:1}
.pass .date{font-weight:700;color:var(--ink2)}
.pass .lbl{font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.pass .course{font-weight:800;font-size:16px;margin-top:10px}
.pass .route{display:flex;align-items:center;gap:10px;margin-top:4px;color:var(--muted);font-weight:600;font-size:14px}
.pass .route i{flex:1;height:2px;background:repeating-linear-gradient(90deg,var(--line) 0 6px,transparent 6px 10px);min-width:30px}
@media (max-width:620px){.pass{grid-template-columns:1fr}.pass .r{border-left:0;border-top:2px dashed var(--line);flex-direction:row;flex-wrap:wrap;justify-content:flex-start}}

/* chat */
.chat{display:flex;flex-direction:column;height:calc(100vh - 150px);min-height:420px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh);overflow:hidden}
.chat .head{display:flex;align-items:center;gap:12px;padding:14px 18px;border-bottom:1px solid var(--line)}
.chat .log{flex:1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:10px;background:var(--card2)}
.bub{max-width:min(78%,560px);padding:10px 14px;border-radius:16px;white-space:pre-wrap;word-wrap:break-word;font-size:15.5px;line-height:1.5}
.bub.me{align-self:flex-end;background:var(--sky);color:#fff;border-bottom-right-radius:5px}
.bub.them{align-self:flex-start;background:var(--card);border:1px solid var(--line);border-bottom-left-radius:5px}
.bub .tm{display:block;font-size:11.5px;opacity:.7;margin-top:4px}
.bub.ai{max-width:min(88%,720px)}
.bub.ai p{margin:0 0 8px}.bub.ai p:last-child{margin:0}
.bub.ai ul,.bub.ai ol{margin:4px 0 8px;padding-left:20px}
.chat .send{display:flex;gap:10px;padding:12px;border-top:1px solid var(--line);background:var(--card)}
.chat .send textarea{flex:1;min-height:46px;max-height:140px;resize:none}
.day{align-self:center;font-size:12px;font-weight:700;color:var(--muted);background:var(--card);border:1px solid var(--line);padding:3px 10px;border-radius:99px}
.typing{align-self:flex-start;color:var(--muted);font-size:14px;font-style:italic}
.sugg{display:flex;flex-wrap:wrap;gap:8px;padding:0 18px 14px;background:var(--card2)}
.sugg button{border:1px solid var(--line);background:var(--card);border-radius:99px;padding:7px 12px;font-size:13.5px;font-weight:600;cursor:pointer;color:var(--ink2)}
@media (max-width:960px){.chat{height:calc(100vh - 210px)}}

/* threads (teacher) */
.threads{display:grid;grid-template-columns:300px minmax(0,1fr);gap:18px}
.tlist{background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--sh);max-height:calc(100vh - 150px);overflow-y:auto}
.tlist button{width:100%;display:flex;gap:12px;align-items:center;padding:12px 14px;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;cursor:pointer}
.tlist button[aria-current="true"]{background:var(--skybg)}
.tlist .nm{font-weight:700;font-size:14.5px}
.tlist .lt{font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:170px}
@media (max-width:860px){.threads{grid-template-columns:1fr}.threads.open .tlist{display:none}.threads:not(.open) .chat{display:none}}

/* AI floating button */
.fab{position:fixed;right:22px;bottom:22px;z-index:30;display:flex;align-items:center;gap:10px;background:linear-gradient(135deg,#7C4DFF,#2F7BEF);color:#fff;border:0;border-radius:99px;padding:12px 18px 12px 14px;font-weight:800;box-shadow:0 14px 30px -10px rgba(76,60,220,.7);cursor:pointer;text-decoration:none}
.fab svg{width:22px;height:22px}
@media (max-width:960px){.fab{bottom:84px;right:14px;padding:12px}.fab span{display:none}}

/* exercises */
.mhead{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;flex-wrap:wrap;margin:0 0 14px}
.mhead .num{display:block;font-weight:800;font-size:13px;color:var(--red);letter-spacing:.06em;text-transform:uppercase;margin-bottom:6px}
.mhead h2{font-size:clamp(22px,3vw,30px);font-weight:800}
.intro{max-width:75ch;color:var(--ink2);margin:0 0 18px}
.learn details{background:var(--card);border:1px solid var(--line);border-radius:14px;margin:0 0 10px;box-shadow:var(--sh)}
.learn summary{cursor:pointer;padding:14px 18px;font-weight:800;list-style:none;display:flex;gap:12px;align-items:center}
.learn summary::-webkit-details-marker{display:none}
.learn summary::after{content:"+";margin-left:auto;font-size:22px;color:var(--sky);line-height:1}
.learn details[open] summary::after{content:"−"}
.learn summary .tn{width:28px;height:28px;border-radius:8px;background:var(--redbg);color:var(--red);display:grid;place-items:center;font-size:13.5px;flex:none}
.lbody{padding:0 18px 16px;max-width:80ch}
.lbody p{margin:0 0 10px}
.lbody ul{margin:0 0 10px;padding-left:22px}
.wex{background:var(--skybg);border-left:4px solid var(--sky);border-radius:0 12px 12px 0;padding:12px 16px;margin-top:6px}
.wex p{margin:0 0 6px}.wex ol{margin:0;padding-left:22px}
.ptable{border-collapse:collapse;width:100%;margin:6px 0 12px;font-size:15px;border:1px solid var(--line);border-radius:12px;overflow:hidden;display:block;overflow-x:auto}
.ptable th{background:var(--navy);color:#fff;text-align:left;padding:9px 12px;font-weight:700;font-size:14px}
.ptable td{padding:9px 12px;border-top:1px solid var(--line);vertical-align:top}
.ptable td:first-child{font-weight:700}
.strip{border:1px solid var(--line);background:var(--card);border-radius:14px;overflow:hidden;margin:0 0 16px}
.strip table{border-collapse:collapse;width:100%}
.strip caption{text-align:left;font-weight:800;padding:10px 14px;border-bottom:1px solid var(--line);font-size:14px;color:var(--muted)}
.strip th{background:var(--navy);color:#fff;font-weight:600;text-align:left;padding:10px 14px;width:34%;font-size:15px;vertical-align:top}
.strip td{padding:10px 14px;font-weight:700;border-bottom:1px solid var(--line)}
.sym th{width:auto}.sym td{font-weight:400}.sym td.s{font-weight:800;white-space:nowrap}
.remember{background:var(--warnbg);border-left:4px solid var(--warn);padding:12px 16px;border-radius:0 12px 12px 0;margin:0 0 24px;max-width:85ch}
.remember b{color:var(--warn)}
.part{margin:28px 0 0}
.part h2{font-size:20px;font-weight:800;margin:0 0 4px}
.how{margin:0 0 14px;color:var(--muted);max-width:75ch}
.q{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;margin:0 0 12px;box-shadow:var(--sh)}
.q.done{border-left:5px solid var(--ok)}
.q .qt{margin:0 0 12px;font-weight:700}
.q .qn{color:var(--red);margin-right:6px;font-weight:800}
.tag{display:inline-block;font-size:12px;font-weight:800;padding:2px 9px;border-radius:99px;background:var(--skybg);color:var(--sky);margin-right:6px;vertical-align:middle}
.opts{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 12px}
.opt{font:inherit;font-size:15.5px;padding:9px 16px;border:1.5px solid var(--line);border-radius:12px;background:var(--card2);color:var(--ink);cursor:pointer;min-height:44px;text-align:left}
.opt:hover{border-color:var(--sky)}
.opt[aria-checked="true"]{border-color:var(--sky);background:var(--sky);color:#fff}
.opt.right{border-color:var(--ok);background:var(--okbg);color:var(--ok)}
.opt.wrong{border-color:var(--no);background:var(--nobg);color:var(--no)}
.numrow{display:flex;align-items:center;gap:8px;margin:0 0 12px;flex-wrap:wrap}
.numrow .input{width:200px}
.numrow .unit{color:var(--muted);font-weight:700}
.txtin{max-width:680px;margin:0 0 12px;display:block}
.acts{display:flex;gap:10px;flex-wrap:wrap}
.fb{margin:12px 0 0;padding:10px 14px;border-radius:12px;font-weight:700}
.fb.ok{background:var(--okbg);color:var(--ok)}
.fb.no{background:var(--nobg);color:var(--no)}
.method,.model{margin-top:12px;border-radius:12px;padding:12px 16px}
.method{background:var(--skybg)}
.model{background:var(--okbg);border-left:4px solid var(--ok)}
.method h3,.model h3{font-size:14px;margin:0 0 6px;color:var(--muted);font-weight:800}
.model h3{color:var(--ok)}
.method ol{margin:0;padding-left:22px}
.model p{margin:0 0 6px;white-space:pre-line}
.model ul{margin:6px 0 0;padding-left:22px}
.keys{margin:10px 0 0;padding:10px 14px;border-radius:12px;background:var(--card2);list-style:none}
.keys .y{color:var(--ok);font-weight:800}.keys .n{color:var(--no);font-weight:800}
.media{margin:0 0 12px}
.media audio{width:100%;max-width:520px;display:block}
.media img{display:block;width:100%;max-width:640px;height:auto;border-radius:14px;border:1px solid var(--line);background:#fff}
.tr{background:var(--card2);border-radius:12px;padding:10px 14px;margin:8px 0 0;max-width:75ch;white-space:pre-line;font-size:15px}
.rec{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:0 0 12px}
.rec .dot{display:inline-block;width:10px;height:10px;border-radius:50%;background:var(--red);margin-right:6px;animation:bl 1s infinite}
@keyframes bl{50%{opacity:.2}}
.foot{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:24px;padding-top:16px;border-top:1px solid var(--line)}
.crumbs{display:flex;gap:8px;align-items:center;color:var(--muted);font-weight:700;font-size:14px;margin:0 0 12px;flex-wrap:wrap}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--sky)}

/* test runner */
.tq{max-width:820px;margin:0 auto}
.tprog{display:flex;align-items:center;gap:14px;margin:0 0 14px}
.tprog .bar{flex:1}
.timer{font-variant-numeric:tabular-nums;font-weight:800;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:6px 10px}
.qdots{display:flex;flex-wrap:wrap;gap:6px;margin:14px 0 0}
.qdots button{width:32px;height:32px;border-radius:9px;border:1.5px solid var(--line);background:var(--card);font-weight:700;font-size:13px;cursor:pointer}
.qdots button.ans{background:var(--skybg);border-color:var(--sky);color:var(--sky)}
.qdots button.cur{outline:2px solid var(--navy);outline-offset:1px}
.result-hero{display:flex;align-items:center;gap:26px;flex-wrap:wrap}
.mb{display:grid;grid-template-columns:minmax(0,1fr) 140px 52px;gap:12px;align-items:center;padding:8px 0;border-top:1px solid var(--line);font-size:14.5px}
.mb:first-of-type{border-top:0}
.rv{border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:0 0 10px;background:var(--card)}
.rv.ok{border-left:5px solid var(--ok)}.rv.no{border-left:5px solid var(--no)}
.rv .ya{color:var(--no);font-weight:700}.rv .ca{color:var(--ok);font-weight:700}

/* table (teacher) */
.tbl{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th{text-align:left;font-size:12.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);padding:10px 12px;border-bottom:1px solid var(--line)}
.tbl td{padding:12px;border-bottom:1px solid var(--line);vertical-align:middle}
.tick{display:inline-flex;gap:6px;align-items:center;font-weight:700;cursor:pointer;white-space:nowrap;font-size:13.5px;border:1px solid var(--line);border-radius:10px;padding:5px 9px;background:var(--card2)}
.tick input{width:17px;height:17px;accent-color:var(--sky)}
.tick.on{background:var(--skybg);border-color:var(--sky);color:var(--sky)}
.scard{display:grid;grid-template-columns:auto minmax(0,1fr);gap:14px;align-items:start}
.drawer{position:fixed;inset:0;z-index:50;background:rgba(7,14,31,.45);display:flex;justify-content:flex-end}
.drawer .panel{width:min(560px,100%);height:100%;overflow-y:auto;background:var(--bg);padding:22px;box-shadow:var(--sh2)}
.modal{position:fixed;inset:0;z-index:60;background:rgba(7,14,31,.5);display:grid;place-items:center;padding:16px}
.modal .card{width:min(520px,100%);max-height:90vh;overflow-y:auto}
.photo-edit{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.demo{background:var(--warnbg);color:var(--ink);padding:8px 16px;font-size:14px;text-align:center}
.demo b{color:var(--warn)}
@media print{.side,.tabbar,.fab,.topbar{display:none!important}.shell{display:block}}

.badge[hidden],.dot[hidden],.fab[hidden]{display:none!important}
.side .me svg{width:22px;height:22px;flex:none}
.qn{margin-right:6px;color:var(--red);font-weight:800}
.pass .route{flex-wrap:wrap}.pass .route span{white-space:nowrap}
.hero svg.plane{position:absolute;right:-70px;bottom:-40px;width:420px;opacity:.35;pointer-events:none}
.hero>*{position:relative}
.content{padding-bottom:110px}

.pass .r{min-width:0}
@media (max-width:1180px) and (min-width:961px){#nextclass .pass{grid-template-columns:1fr}#nextclass .pass .r{border-left:0;border-top:2px dashed var(--line);flex-direction:row;flex-wrap:wrap;justify-content:flex-start}}
@media (max-width:620px){.stat{padding:12px 14px}.stat .v{font-size:22px}.stat .ic{width:30px;height:30px;margin-bottom:6px}.hero{padding:20px}.card{padding:18px}}

.brand .mark{background:#fff;box-shadow:0 6px 14px -6px rgba(0,0,0,.35)}
.brand .mark img{width:28px;height:28px;display:block}

/* ---------- v3: dashboard, ICAO profile, AI teacher ---------- */
.nav a[hidden],.aibtn[hidden]{display:none!important}
.aibtn{display:inline-flex;align-items:center;gap:8px;height:42px;padding:0 16px 0 12px;border-radius:99px;background:linear-gradient(135deg,#5B3FE0,#2F7BEF);color:#fff;font-weight:800;font-size:14px;text-decoration:none;white-space:nowrap}
.aibtn svg{width:20px;height:20px}
.aibtn[aria-current="page"]{outline:2px solid var(--sky2);outline-offset:2px}
@media (max-width:960px){.aibtn{width:42px;padding:0;justify-content:center}.aibtn span{display:none}}
.fab{display:none!important}
.sec-h{font-size:18px;font-weight:800;margin:0 0 10px}
.stat .s{color:var(--muted);font-size:12.5px;margin-top:2px}
.cic{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;color:#fff;flex:none}
.cic svg{width:22px;height:22px}
.next-step{display:flex;flex-direction:column}
.next-step .ns-t{display:block;font-size:16px;line-height:1.35}
.nc-empty{display:flex;gap:14px;align-items:flex-start;color:var(--muted)}
.nc-empty svg{width:28px;height:28px;flex:none;opacity:.7;margin-top:2px}
.nc-empty p{margin:0}
#nextclass{min-width:0}
.crow{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:center;padding:14px 0;border-top:1px solid var(--line)}
.crow .ct{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.crow .ct b{font-size:15.5px}
.crow .cbar{display:flex;gap:12px;align-items:center;margin:6px 0 2px}
.crow .cbar .bar{flex:1;max-width:320px}
@media (max-width:620px){.crow{grid-template-columns:auto minmax(0,1fr)}.crow>.btn{grid-column:1/-1;width:100%}}
.icao-snap{display:block;text-decoration:none;color:inherit}
.icao-snap:hover h2{color:var(--sky)}
.icao-snap svg{width:20px;height:20px;color:var(--muted)}
.icao-head{display:flex;gap:18px;justify-content:space-between;align-items:flex-start;flex-wrap:wrap}
.icao-head .target{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:150px;padding:14px 18px;border-radius:16px;background:var(--navy);color:#fff;text-align:center}
.icao-head .target .lbl{font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#9FB5DD}
.icao-head .target b{font-size:24px;line-height:1.2}
.icao-head .target .tiny{color:#CFE0FF}
.skl{display:grid;grid-template-columns:minmax(110px,150px) minmax(0,1fr) minmax(110px,auto);gap:12px;align-items:center;padding:9px 0;border-top:1px solid var(--line)}
.skl-list .skl:first-child{border-top:0}
.skl .nm{font-weight:700;font-size:14.5px}
.skl .vv{text-align:right;white-space:nowrap}
.lv{display:grid;grid-template-columns:repeat(6,1fr);gap:4px;max-width:320px}
.lv i{height:12px;border-radius:4px;background:var(--card2);border:1px solid var(--line)}
.lv i.on{background:var(--ok);border-color:var(--ok)}
.lv.low i.on{background:var(--warn);border-color:var(--warn)}
@media (max-width:620px){.skl{grid-template-columns:1fr auto}.skl .nm{grid-column:1}.skl .vv{grid-column:2;grid-row:1}.skl>.lv,.skl>.bar,.skl>.small{grid-column:1/-1}}
.overall{display:flex;flex-direction:column;gap:2px;margin-top:12px;padding:12px 14px;border-radius:12px;background:var(--skybg)}
.fbx{margin-top:12px;padding:10px 14px;border-radius:12px;border-left:4px solid}
.fbx p{margin:4px 0 0;white-space:pre-wrap}
.fbx.ok{background:var(--okbg);border-color:var(--ok)}.fbx.ok b{color:var(--ok)}
.fbx.warn{background:var(--warnbg);border-color:var(--warn)}.fbx.warn b{color:var(--warn)}
.fbx.sky{background:var(--skybg);border-color:var(--sky)}.fbx.sky b{color:var(--sky)}
.rec-t{padding:10px 0;border-top:1px solid var(--line)}
.rec-t ul{margin:6px 0 0;padding-left:20px}.rec-t li{margin:3px 0}
.mock-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,170px),1fr));gap:10px}
.mock{display:flex;flex-direction:column;gap:6px;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:var(--card2);text-decoration:none;color:inherit}
.mock:hover{border-color:var(--sky)}
.topic-cat{font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:16px 0 4px}
.topic{border-top:1px solid var(--line)}
.topic summary{cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 2px;font-weight:700;list-style:none;min-height:44px}
.topic summary::-webkit-details-marker{display:none}
.topic summary::after{content:"+";color:var(--sky);font-size:20px;line-height:1;margin-left:4px}
.topic[open] summary::after{content:"−"}
.topic summary>span:first-child{flex:1}
.topic ul{margin:0 0 12px;padding-left:20px}.topic li{margin:4px 0}
.ai-note{display:flex;gap:8px;align-items:flex-start;margin:0;padding:8px 18px;font-size:13px;color:var(--ink2);background:var(--warnbg);border-bottom:1px solid var(--line)}
.ai-note svg{flex:none;margin-top:2px;color:var(--warn)}
.modes{display:flex;gap:8px;padding:10px 12px 0;overflow-x:auto;background:var(--card);border-top:1px solid var(--line)}
.modes button{flex:none;border:1.5px solid var(--sky);background:var(--skybg);color:var(--sky);border-radius:99px;padding:7px 13px;font-size:13.5px;font-weight:700;cursor:pointer;min-height:36px}
.modes+.send{border-top:0}
.sugg button{min-height:36px}
.tabbar a{min-height:48px}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* ---------- v4: teacher management, homework ---------- */
.filters{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr) minmax(0,1fr);gap:10px;margin:18px 0 8px}
@media (max-width:760px){.filters{grid-template-columns:1fr}}
.save-st{font-size:12.5px;font-weight:700;color:var(--muted);text-transform:none;letter-spacing:0}
.save-st.ok{color:var(--ok)}.save-st.no{color:var(--no)}
.tabs-scroll{margin:18px 0;overflow-x:auto;scrollbar-width:thin}
.tabs-scroll button{flex:none;white-space:nowrap;padding:9px 14px}
.lrow{padding:8px 0;border-top:1px solid var(--line);flex-wrap:nowrap}
.lrow>span:first-child{min-width:0;overflow:hidden;text-overflow:ellipsis}
.hwrow{padding:14px 0;border-top:1px solid var(--line)}
.hwrow:first-of-type{border-top:0}
.hwcard.late{border-left:5px solid var(--no)}.hwcard.done{border-left:5px solid var(--ok);opacity:.92}
.plan{list-style:none;margin:0 0 4px;padding:0}
.plan li{display:flex;align-items:center;gap:8px;padding:6px 0;border-top:1px solid var(--line)}
.plan li:first-child{border-top:0}
.plan .pl{flex:1;display:flex;gap:10px;align-items:center;cursor:pointer;min-height:36px}
.plan .pl input{width:18px;height:18px;accent-color:var(--ok);flex:none}
.plan li.done .pl span{text-decoration:line-through;color:var(--muted)}
.plan-ro{list-style:none;margin:0;padding:0}.plan-ro li{padding:3px 0;font-size:14px}.plan-ro li.done{color:var(--muted);text-decoration:line-through}
.iconbtn.sm{width:34px;height:34px;border-radius:10px}.iconbtn.sm svg{width:16px;height:16px}

/* ---------- v5: entrance exam (diagrams, lettered options, HTML explanations) ---------- */
:root{--ex-cell:#F6D776;--ex-gear:#E3E8EF;--ex-water:#BFD9F2;--ex-accent:#A86200}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--ex-cell:#8C6B12;--ex-gear:#26324A;--ex-water:#1E4366;--ex-accent:#F2C230}}
.media .fig{overflow-x:auto;padding:4px 0;margin:0 0 4px}
.fig svg.exf{display:block;max-width:none;height:auto}
svg.exf .stroke{stroke:var(--ink);stroke-width:3;fill:none;stroke-linecap:round;stroke-linejoin:round}
svg.exf .thin{stroke:var(--ink);stroke-width:1.5;fill:none}
svg.exf .solid{fill:var(--ink)}
svg.exf .hollow{fill:none;stroke:var(--ink);stroke-width:3;stroke-linejoin:round}
svg.exf .frame{fill:var(--card);stroke:var(--line);stroke-width:1.5}
svg.exf .qmark{fill:var(--muted);font:700 34px var(--font)}
svg.exf .cell{fill:var(--ex-cell);stroke:var(--ink);stroke-width:1.5}
svg.exf .glyph{fill:var(--ink);font:800 54px var(--font)}
svg.exf .gear{fill:var(--ex-gear);stroke:var(--ink);stroke-width:1.5;stroke-linejoin:round}
svg.exf .hub{fill:var(--card);stroke:var(--ink);stroke-width:1.5}
svg.exf .turn{fill:none;stroke:var(--ex-accent);stroke-width:3;stroke-linecap:round}
svg.exf .turn-head{fill:var(--ex-accent)}
svg.exf .lbl{fill:var(--ink);font:600 13px var(--font)}
svg.exf .lbl-m{fill:var(--muted);font:500 12px var(--font)}
svg.exf .water{fill:var(--ex-water)}
svg.exf .mass{fill:var(--ex-cell);stroke:var(--ink);stroke-width:1.5}
.okey{display:inline-grid;place-items:center;min-width:22px;height:22px;margin-right:8px;border:1.5px solid currentColor;border-radius:6px;font-size:12px;font-weight:800;opacity:.75;vertical-align:middle}
.opts-fig{display:grid;grid-template-columns:repeat(auto-fill,minmax(104px,1fr))}
.opts-fig .opt{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px}
.opts-fig .okey{margin:0}
.opt svg.exf{display:block;width:72px;height:72px}
.opt[aria-checked="true"] svg.exf .stroke,.opt[aria-checked="true"] svg.exf .hollow{stroke:#fff}
.opt[aria-checked="true"] svg.exf .solid,.opt[aria-checked="true"] svg.exf .glyph{fill:#fff}
.rv svg.exf,.tr svg.exf,.model svg.exf{width:44px;height:44px;vertical-align:middle}
.q .why{display:block;margin-top:8px;font-weight:400;font-size:14.5px;color:var(--muted)}
.exh .ans{margin:0 0 8px}
.exh p{margin:0 0 8px}
.exh .steps{margin:4px 0 8px;padding-left:22px}
.exh .steps li{margin:3px 0}
.calc{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.92em;background:var(--card);border:1px solid var(--line);padding:0 5px;border-radius:5px;white-space:nowrap}
.exh .tip{color:var(--ink2);font-size:14.5px}
.passage{display:block;font-weight:400;border-left:3px solid var(--warn);padding:8px 12px;margin-bottom:10px;background:var(--card2);border-radius:0 8px 8px 0}
.method svg.exf{width:56px;height:56px;vertical-align:middle}

/* ---------- v6: level test ---------- */
.gap{display:inline-block;min-width:3.2em;border-bottom:2px solid var(--sky);color:transparent;line-height:1.1}
.lvl-card{display:flex;gap:22px;align-items:flex-start;flex-wrap:wrap}
.lvl-badge{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:140px;padding:16px;border-radius:18px;background:var(--grad);color:#fff;text-align:center}
.lvl-badge .lbl{font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#CFE0FF}
.lvl-badge b{font-size:44px;line-height:1.05}
.lvl-badge span:last-child{font-size:13.5px;color:#D3E2FF}

/* ---------- v8: notifications ---------- */
.bellwrap{position:relative}
.bellbtn .nbadge{position:absolute;top:-6px;right:-6px;margin:0;height:20px;min-width:20px;font-size:11px;border:2px solid var(--card)}
.npanel{position:absolute;right:0;top:52px;width:min(380px,calc(100vw - 24px));max-height:min(70vh,560px);display:flex;flex-direction:column;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:18px;box-shadow:var(--sh2);z-index:70;overflow:hidden}
@media (max-width:960px){.npanel{position:fixed;left:12px;right:12px;top:64px;width:auto}}
.nhead{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;border-bottom:1px solid var(--line)}
.nhead .link:disabled{opacity:.4;cursor:default}
.nlist{overflow-y:auto}
.nall{display:block;text-align:center;padding:12px;border-top:1px solid var(--line);font-weight:700;text-decoration:none}
.nrow{width:100%;display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:0;border-bottom:1px solid var(--line);background:none;text-align:left;cursor:pointer;color:var(--ink);font:inherit}
.nrow:hover{background:var(--card2)}
.nrow.unread{background:var(--skybg)}
.nrow .nic{flex:none;width:38px;height:38px;border-radius:12px;display:grid;place-items:center;background:var(--card2);color:var(--sky)}
.nrow .nic svg{width:19px;height:19px}
.nrow .nic.t-class,.nrow .nic.t-reminder,.nrow .nic.t-overdue{color:var(--warn)}
.nrow .nic.t-feedback,.nrow .nic.t-announce{color:var(--red)}
.nrow .nic.t-access,.nrow .nic.t-course{color:var(--ok)}
.nrow .nt{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
.nrow .nt b{font-size:14.5px;line-height:1.3}
.nrow .nb{font-size:13.5px;color:var(--ink2);overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.nrow .na{font-size:12px;color:var(--muted)}
.nrow .ndot{flex:none;width:10px;height:10px;border-radius:50%;background:var(--sky);margin-top:6px}
.nlist-page{padding:6px}
.nlist-page .nrow{border-radius:12px;border-bottom:0;margin-bottom:4px}
.topbar .bellwrap .iconbtn{color:inherit}

/* ---------- v8: vocabulary trainer ---------- */
.voc-stats{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;text-align:center}
.voc-stats b{display:block;font-size:28px;font-weight:800;line-height:1.1}
.voc-stats span{font-size:12.5px;color:var(--muted);font-weight:600}
@media (max-width:620px){.voc-stats{grid-template-columns:repeat(3,minmax(0,1fr));row-gap:14px}}
.voc-tile{display:flex;gap:14px;align-items:flex-start;text-decoration:none;color:inherit}
.voc-tile:hover{border-color:var(--sky)}
.voc-tile b{display:block;font-size:16px;margin-bottom:2px}
.voc-tile.hot{border:2px solid var(--red)}
.vlist{border-top:1px solid var(--line)}
.vrow{border-bottom:1px solid var(--line)}
.vrow summary{list-style:none;cursor:pointer;display:grid;grid-template-columns:minmax(120px,220px) minmax(0,1fr) auto;gap:12px;align-items:center;padding:11px 4px;min-height:44px}
.vrow summary::-webkit-details-marker{display:none}
.vrow .vw{font-weight:800}
.vrow .vm{color:var(--ink2);font-size:14.5px}
.vrow .vbody{padding:0 4px 14px}
@media (max-width:620px){.vrow summary{grid-template-columns:minmax(0,1fr) auto}.vrow .vm{grid-column:1/-1;grid-row:2}}
.fc-wrap{max-width:620px;margin:0 auto}
.fcard{width:100%;min-height:300px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;text-align:center;padding:28px;margin:0 0 14px;border-radius:24px;border:1px solid var(--line);background:var(--card);box-shadow:var(--sh);cursor:pointer;font:inherit;color:var(--ink)}
.fcard.flipped{background:linear-gradient(160deg,var(--card),var(--skybg))}
.fcard .fw{font-size:clamp(26px,5vw,36px);line-height:1.15}
.fcard .fm{font-size:19px;font-weight:600;max-width:46ch}
.fcard .fe{font-size:16px;color:var(--ink2);font-style:italic;max-width:50ch}
.fc-acts{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.fc-acts .btn{flex-direction:column;padding:10px 6px;white-space:normal;line-height:1.2}
.fc-acts .btn span{display:flex;flex-direction:column;gap:2px}
.fc-acts .btn small{font-weight:600;opacity:.85;font-size:12px}
.opt.right{border-color:var(--ok);background:var(--okbg);color:var(--ok)}

/* v9 real-photo picture description */
.media img.photo{width:100%;max-height:560px;object-fit:contain;background:#0d1b2a;border-radius:12px}
.photo-cap{margin:4px 2px 0;font-size:12px;color:var(--muted)}
.pd-tools{align-items:center;margin-top:10px}
.pd-timer{display:inline-flex;align-items:center;gap:8px}
.pd-timer .tm{font-variant-numeric:tabular-nums;font-size:18px;min-width:44px}
.pd-timer .tm.end{color:#c0392b}
.pd-voc{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px;margin:6px 0 10px}
.pd-voc div{background:var(--card2);border-radius:10px;padding:8px 10px;display:flex;flex-direction:column;gap:2px}
.pd-voc span{font-size:14px;color:var(--muted)}
.pd-model h4,.pd-help h4{margin:14px 0 4px;font-size:15px}
.pd-cols{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.pd-f,.pd-s{border-radius:10px;padding:4px 12px 2px}
.pd-f{background:rgba(46,160,90,.09);border-left:4px solid #2ea05a}
.pd-s{background:rgba(230,150,30,.10);border-left:4px solid #e6961e}
.pd-f h4,.pd-s h4{margin-top:8px}
.pd-text{line-height:1.6}
.pd-l4 summary{cursor:pointer;font-weight:600;margin:6px 0}
@media (max-width:640px){.pd-cols{grid-template-columns:1fr}}

/* v10 academies, filters, course overview, difficulty */
.acad-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:12px}
.acad{position:relative;display:flex;flex-direction:column;gap:6px;padding:14px;border:1px solid var(--line);border-radius:14px;background:var(--card2);text-decoration:none;color:var(--ink);transition:border-color .15s,transform .15s}
.acad:hover{border-color:var(--sky);transform:translateY(-1px)}
.acad.off{opacity:.62}
.acad b{font-size:14.5px;line-height:1.3}
.acad .an,.acad-h .an{position:absolute;top:10px;right:12px;font-weight:800;color:var(--muted);font-size:13px}
.acad .bar{margin-top:auto}
.cfilter{display:flex;flex-direction:column;gap:10px;margin:0 0 18px}
.cfilter .input{max-width:520px}
.fchip{border:1px solid var(--line);background:var(--card);color:var(--ink2);border-radius:99px;padding:7px 13px;font:inherit;font-size:13.5px;font-weight:700;cursor:pointer}
.fchip[aria-pressed="true"]{background:var(--sky);border-color:var(--sky);color:#fff}
.acad-sec{margin:0 0 26px}
.acad-h{position:relative;display:flex;gap:12px;align-items:flex-start;margin:0 0 12px}
.acad-h .an{position:static;display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--skybg);color:var(--sky);flex:none;font-size:15px}
.acad-h h2{margin:0 0 2px}
.acad-h p{margin:0}
.pathway{list-style:none;counter-reset:pw;display:flex;flex-wrap:wrap;gap:8px;margin:0 0 14px;padding:0}
.pathway li{counter-increment:pw;display:flex;flex-direction:column;gap:2px;padding:9px 12px;border-radius:12px;border:1px dashed var(--line);font-size:13px;min-width:170px;flex:1}
.pathway li::before{content:counter(pw);font-weight:800;color:var(--muted);font-size:12px}
.pathway li.on{border-style:solid;border-color:var(--sky);background:var(--skybg)}
.pathway li span{color:var(--muted)}
.hits{margin:8px 0 0;padding-left:18px;font-size:13.5px}
.goals{margin:0;padding-left:20px}
.goals li{margin:4px 0}
.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin-top:12px;font-size:14.5px}
.kv span{color:var(--muted)}
.mlist li{display:flex;align-items:center}
.mlist li button{flex:1;min-width:0}
.mtest{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;color:var(--sky);flex:none}
.mtest:hover{background:var(--skybg)}
.qt .tag.lv1{background:var(--okbg);color:var(--ok)}
.qt .tag.lv2{background:var(--skybg);color:var(--sky)}
.qt .tag.lv3{background:rgba(124,58,237,.14);color:#8b5cf6}
.acad-sec .grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.chip.wrap{white-space:normal;text-align:left;line-height:1.35}
.tick{white-space:normal;max-width:100%}

/* v12 video classes */
.media.vidbox video{display:block;width:100%;aspect-ratio:16/9;background:#0B1631;border-radius:12px}
/* v13 free trial */
.trial-hero{background:linear-gradient(150deg,var(--warnbg),var(--card));border-color:#F3D9A4}
:root[data-theme="dark"] .trial-hero{border-color:#5A4518}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .trial-hero{border-color:#5A4518}}
.trial-enrol{border:2px solid var(--blue,#1d4ed8)}
.modal .tick{display:flex;align-items:center;gap:8px;margin:5px 0;font-size:15px}
.modal .tick input{flex:none;width:18px;height:18px}

/* v14 view-only document viewer */
.viewer{position:fixed;inset:0;z-index:200;background:#0A1226;display:flex;flex-direction:column;-webkit-user-select:none;user-select:none}
.viewer .vhead{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;padding-top:max(12px,env(safe-area-inset-top));background:#0B1B3F;color:#fff}
.viewer .vhead .tiny{color:#9FB5DD}
.viewer .vhead .iconbtn{color:#fff;flex:none;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.28);width:44px;height:44px;border-radius:12px;display:grid;place-items:center;cursor:pointer}
.viewer .vhead .iconbtn svg{width:22px;height:22px}
.viewer .vbody{flex:1;overflow:auto;padding:16px;-webkit-overflow-scrolling:touch}
.viewer .vpage{position:relative;max-width:900px;margin:0 auto 16px;background:#fff;color:#111;border-radius:6px;overflow:hidden;box-shadow:0 10px 30px rgba(0,0,0,.4)}
.viewer .vpage canvas,.viewer .vpage img{display:block;width:100%;height:auto;pointer-events:none}
.viewer .vmark{position:absolute;inset:0;pointer-events:none;z-index:2;background-repeat:repeat}
.viewer .vdoc{padding:28px 30px;font-size:16px;line-height:1.6;color:#111}
.viewer .vdoc img{max-width:100%;height:auto}
.viewer .vdoc table{border-collapse:collapse;max-width:100%}.viewer .vdoc td,.viewer .vdoc th{border:1px solid #ccc;padding:4px 8px}
body.noscroll{overflow:hidden}
@media print{.viewer{display:none!important}}
/* v14: phone top bar with the night-mode button */
.topbar .iconbtn,.topbar .aibtn,.topbar .bellwrap,.topbar #topav{flex:none}
@media (max-width:480px){.topbar{gap:7px;padding:10px 12px}.topbar .iconbtn,.topbar .aibtn{width:38px;height:38px}.topbar .iconbtn svg,.topbar .aibtn svg{width:19px;height:19px}}
@media (max-width:420px){.topbar .mob-brand .brand>span:last-child{display:none}}