/* Export Knowledge OS – giao diện "bãi container": nền hải đồ, thép gợn sóng, vàng tín hiệu */
:root{
  --paper:#F1F5F5; --card:#FFFFFF; --ink:#12262F; --ink2:#51666F; --line:#D3DDE0; --soft:#E7EEEF;
  --navy:#0D2733; --navy2:#16394A; --navy-ink:#CFE0E6;
  --teal:#176A6E; --teal-soft:#D6ECEC; --signal:#E3A71B; --signal-soft:#FBF0CF; --signal-ink:#5A4000;
  --rust:#B23E29; --rust-soft:#F7DDD7; --green:#2B7A4B; --green-soft:#D9EFE2; --blue:#2F5F9E; --blue-soft:#DCE8F7;
  --radius:10px; --shadow:0 1px 0 rgba(13,39,51,.06),0 6px 18px -10px rgba(13,39,51,.25);
  --font:"Be Vietnam Pro","Segoe UI",Roboto,"Helvetica Neue",system-ui,-apple-system,sans-serif;
  color-scheme:light;
}
:root[data-theme="dark"]{
  --paper:#0A171E; --card:#112530; --ink:#E4EEF1; --ink2:#9DB2BB; --line:#25414E; --soft:#17313D;
  --navy:#07141A; --navy2:#102A36; --navy-ink:#B9CFD7;
  --teal:#4FB5B8; --teal-soft:#123C40; --signal:#F0BC3A; --signal-soft:#3A2F0E; --signal-ink:#F4D98B;
  --rust:#E8735E; --rust-soft:#3F1D17; --green:#59BE82; --green-soft:#12301F; --blue:#78A6E6; --blue-soft:#16294A;
  --shadow:0 1px 0 rgba(0,0,0,.4),0 6px 18px -10px rgba(0,0,0,.7); color-scheme:dark;
}
@media (prefers-color-scheme:dark){:root[data-theme="auto"]{
  --paper:#0A171E; --card:#112530; --ink:#E4EEF1; --ink2:#9DB2BB; --line:#25414E; --soft:#17313D;
  --navy:#07141A; --navy2:#102A36; --navy-ink:#B9CFD7;
  --teal:#4FB5B8; --teal-soft:#123C40; --signal:#F0BC3A; --signal-soft:#3A2F0E; --signal-ink:#F4D98B;
  --rust:#E8735E; --rust-soft:#3F1D17; --green:#59BE82; --green-soft:#12301F; --blue:#78A6E6; --blue-soft:#16294A;
  --shadow:0 1px 0 rgba(0,0,0,.4),0 6px 18px -10px rgba(0,0,0,.7); color-scheme:dark;}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--font);font-feature-settings:"tnum" 1}
h1,h2,h3,h4{line-height:1.25;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:1.75rem;font-weight:750}h2{font-size:1.3rem;font-weight:700}h3{font-size:1.08rem;font-weight:650}h4{font-size:.98rem;font-weight:650}
p{margin:0 0 .8em}a{color:var(--teal);text-underline-offset:3px}
ul,ol{margin:.2em 0 .9em;padding-left:1.3em}li{margin:.25em 0}
mark{background:var(--signal-soft);color:inherit;border-radius:3px;padding:0 1px;box-shadow:0 0 0 1px var(--signal)}
.muted{color:var(--ink2)}.small{font-size:.86rem}.big{font-size:1.35rem;font-weight:650;line-height:1.35}
:focus-visible{outline:3px solid var(--signal);outline-offset:2px;border-radius:4px}
.ic{flex:none;vertical-align:-4px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ===== khung ===== */
.shell{display:grid;grid-template-columns:248px 1fr;min-height:100vh}
.side{background:var(--navy);color:var(--navy-ink);padding:18px 12px;position:sticky;top:0;height:100vh;overflow:auto;display:flex;flex-direction:column;gap:4px}
.brand{display:flex;gap:10px;align-items:center;padding:4px 10px 16px;color:#fff;text-decoration:none}
.brand-mark{width:34px;height:34px;border-radius:7px;background:repeating-linear-gradient(90deg,var(--signal) 0 3px,#c98f10 3px 5px);display:grid;place-items:center;color:var(--navy);font-weight:800}
.brand b{display:block;font-size:.95rem;line-height:1.15;white-space:nowrap}.brand span{font-size:.74rem;color:var(--navy-ink);opacity:.8}
.nav a{display:flex;gap:11px;align-items:center;padding:9px 12px;border-radius:8px;color:var(--navy-ink);text-decoration:none;font-weight:500;font-size:.96rem}
.nav a:hover{background:var(--navy2);color:#fff}
.nav a[aria-current="page"]{background:var(--navy2);color:#fff;box-shadow:inset 3px 0 0 var(--signal)}
.nav .badge-n{margin-left:auto;background:var(--signal);color:var(--signal-ink);font-size:.74rem;font-weight:700;border-radius:99px;padding:1px 8px}
.side-foot{margin-top:auto;font-size:.78rem;opacity:.75;padding:10px}
.main{min-width:0}
.topbar{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);display:flex;gap:10px;align-items:center;padding:10px 24px}
.topbar .search{flex:1;max-width:560px;position:relative}
.topbar .search input{width:100%;padding:9px 12px 9px 38px}
.topbar .search .ic{position:absolute;left:11px;top:10px;color:var(--ink2)}
.topbar .menu-btn{display:none}
.content{padding:26px 24px 90px;max-width:1180px;margin:0 auto}
.banner{display:flex;gap:12px;align-items:center;background:var(--signal-soft);color:var(--signal-ink);border:1px solid var(--signal);padding:10px 14px;border-radius:var(--radius);margin-bottom:18px}
.banner .btn{margin-left:auto}

/* ===== thành phần ===== */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.card.flat{box-shadow:none}.card h2,.card h3{margin-bottom:.6em}
.grid{display:grid;gap:16px}.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.row.between{justify-content:space-between}.grow{flex:1}.mt{margin-top:16px}.mt2{margin-top:28px}.mb{margin-bottom:16px}
.page-head{display:flex;gap:16px;align-items:flex-end;justify-content:space-between;flex-wrap:wrap;margin-bottom:20px}.page-head p{margin:0;color:var(--ink2);max-width:62ch}
.btn{display:inline-flex;gap:8px;align-items:center;justify-content:center;border:1px solid var(--line);background:var(--card);color:var(--ink);padding:8px 14px;border-radius:8px;font:inherit;font-weight:600;font-size:.92rem;cursor:pointer;text-decoration:none;line-height:1.3}
.btn:hover{border-color:var(--ink2)}
.btn.primary{background:var(--teal);border-color:var(--teal);color:#fff}.btn.primary:hover{filter:brightness(1.08)}
:root[data-theme="dark"] .btn.primary{color:#04181a}
.btn.signal{background:var(--signal);border-color:var(--signal);color:var(--signal-ink)}
:root[data-theme="dark"] .btn.signal{color:#2a1d00}
.btn.danger{background:var(--rust);border-color:var(--rust);color:#fff}.btn.ghost{background:transparent}.btn.sm{padding:5px 10px;font-size:.84rem}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.icon-btn{background:none;border:0;color:inherit;cursor:pointer;padding:6px;border-radius:8px;display:inline-grid;place-items:center}.icon-btn:hover{background:var(--soft)}
.icon-btn.fav[aria-pressed="true"]{color:var(--signal)}.icon-btn.fav[aria-pressed="true"] svg{fill:var(--signal)}
input,select,textarea{font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:8px;padding:8px 11px;width:100%}
textarea{resize:vertical;line-height:1.5}input[type=checkbox],input[type=radio]{width:auto}
input:focus,select:focus,textarea:focus{border-color:var(--teal)}
.fgrid{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:end}.fld{display:flex;flex-direction:column;gap:4px}.fld.full{grid-column:1/-1}
.fld label{font-weight:600;font-size:.88rem}.fld small{color:var(--ink2)}.req{color:var(--rust)}.chk{display:flex;gap:8px;align-items:center;font-weight:500!important}
.form-err{color:var(--rust);font-weight:600;min-height:1.2em;margin:.5em 0 0}
.tag{display:inline-flex;gap:5px;align-items:center;font-size:.76rem;font-weight:650;padding:2px 9px;border-radius:99px;background:var(--soft);color:var(--ink2);white-space:nowrap}
.tag.src{background:var(--blue-soft);color:var(--blue)}.tag.inf{background:var(--signal-soft);color:var(--signal-ink)}
.tag.usr{background:var(--green-soft);color:var(--green)}.tag.vfy{background:var(--rust-soft);color:var(--rust)}.tag.ok{background:var(--green-soft);color:var(--green)}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:var(--card);color:var(--ink);padding:5px 12px;border-radius:99px;font:inherit;font-size:.86rem;font-weight:550;cursor:pointer}
.chip[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.tabs{display:flex;gap:2px;border-bottom:1px solid var(--line);margin-bottom:18px;overflow-x:auto}
.tabs a,.tabs button{padding:9px 16px;border:0;background:none;font:inherit;font-weight:600;color:var(--ink2);cursor:pointer;text-decoration:none;border-bottom:3px solid transparent;white-space:nowrap;margin-bottom:-1px}
.tabs [aria-selected="true"]{color:var(--ink);border-bottom-color:var(--signal)}
.empty{text-align:center;padding:36px 16px;color:var(--ink2);border:1px dashed var(--line);border-radius:var(--radius)}
.empty b{display:block;color:var(--ink);font-size:1.05rem;margin-bottom:4px}
table.tbl{width:100%;border-collapse:collapse;font-size:.92rem}.tbl th{text-align:left;font-weight:650;color:var(--ink2);padding:8px 10px;border-bottom:2px solid var(--line);white-space:nowrap}
.tbl td{padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}.tbl tr:hover td{background:color-mix(in srgb,var(--soft) 55%,transparent)}
.tbl-wrap{overflow-x:auto}
.meter{height:8px;border-radius:99px;background:var(--soft);overflow:hidden}.meter>i{display:block;height:100%;background:var(--teal);border-radius:99px}
.kpi{display:flex;flex-direction:column;gap:2px}.kpi b{font-size:1.8rem;line-height:1.1;font-weight:750}.kpi span{color:var(--ink2);font-size:.88rem}
.sw{width:10px;height:10px;border-radius:3px;display:inline-block;flex:none}

/* ===== bãi container (dashboard) ===== */
.yard{display:grid;grid-template-columns:repeat(7,1fr);gap:10px}
.cont{position:relative;display:block;text-decoration:none;color:#fff;border-radius:6px;height:132px;overflow:hidden;background:var(--c);box-shadow:var(--shadow);border:2px solid color-mix(in srgb,var(--c) 70%,#000)}
.cont::before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(90deg,rgba(0,0,0,.18) 0 3px,rgba(255,255,255,.07) 3px 7px)}
.cont .load{position:absolute;left:0;right:0;bottom:0;height:var(--p);background:rgba(255,255,255,.34);border-top:2px dashed rgba(255,255,255,.8);transition:height .5s}
.cont .lbl{position:absolute;inset:auto 0 0 0;padding:8px 8px 7px;background:linear-gradient(transparent,rgba(0,0,0,.55) 40%);font-size:.78rem;line-height:1.2;font-weight:650}
.cont .num{position:absolute;top:7px;left:8px;right:8px;display:flex;justify-content:space-between;font-size:.74rem;font-weight:700;text-shadow:0 1px 2px rgba(0,0,0,.5)}
.cont .pct{position:absolute;top:30px;left:8px;font-size:1.5rem;font-weight:800;text-shadow:0 1px 3px rgba(0,0,0,.5)}
.cont:hover{transform:translateY(-2px)}
.bars{display:flex;gap:4px;align-items:flex-end;height:70px}.bars i{flex:1;background:var(--teal);border-radius:3px 3px 0 0;min-height:2px;opacity:.85}.bars i.z{background:var(--line)}.bars i.t{background:var(--signal)}
.lvl{font-weight:650;font-size:.84rem}

/* ===== danh sách kiến thức ===== */
.filters{display:grid;gap:12px;padding:14px;margin-bottom:16px}
.filters .frow{display:grid;grid-template-columns:2fr 1.4fr 1.4fr 1.2fr;gap:10px}
.rec{display:flex;gap:12px;padding:14px 16px;border:1px solid var(--line);background:var(--card);border-radius:var(--radius);margin-bottom:10px;border-left:6px solid var(--gc);text-decoration:none;color:inherit}
.rec:hover{border-color:var(--ink2);border-left-color:var(--gc)}
.rec h3{margin:0 0 2px;font-size:1.02rem}.rec .en{color:var(--ink2);font-size:.88rem}.rec .sn{color:var(--ink2);font-size:.9rem;margin:6px 0 8px}
.rec .side-r{display:flex;flex-direction:column;align-items:flex-end;gap:6px}
.st{width:22px;height:22px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;color:#fff;font-size:12px}
.st.learning{border-color:var(--signal);background:linear-gradient(90deg,var(--signal) 50%,transparent 50%)}.st.done{border-color:var(--green);background:var(--green)}

/* ===== bài học ===== */
.lesson{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:26px;align-items:start}
.toc{position:sticky;top:76px;display:flex;flex-direction:column;gap:2px}.toc a{padding:6px 10px;border-left:3px solid var(--line);color:var(--ink2);text-decoration:none;font-size:.9rem}.toc a:hover{border-left-color:var(--signal);color:var(--ink)}
.sec{margin-bottom:18px;scroll-margin-top:80px}.sec>h2{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.sec.inf{border-left:6px solid var(--signal)}.sec.src{border-left:6px solid var(--blue)}
.prose{max-width:72ch}.prose h4{margin-top:1em}
.steps{list-style:none;padding:0;counter-reset:s;max-width:72ch}
.steps li{counter-increment:s;display:grid;grid-template-columns:34px 1fr;gap:10px;padding:10px 0;border-bottom:1px solid var(--line);margin:0}
.steps li::before{content:counter(s);width:28px;height:28px;border-radius:50%;background:var(--ink);color:var(--paper);display:grid;place-items:center;font-weight:700;font-size:.85rem}
.steps li.done::before{background:var(--green)}.steps li.done span{color:var(--ink2);text-decoration:line-through}
.steps li label{display:flex;gap:10px;align-items:flex-start;cursor:pointer}
.cl{list-style:none;padding:0}.cl li label{display:flex;gap:10px;cursor:pointer;padding:5px 0}
.cmp{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.cmp>div{border:1px solid var(--line);border-radius:8px;padding:12px;background:var(--paper)}
.cmp .k{font-weight:700;margin-bottom:4px}.cmp .m{border-top:4px solid var(--rust)}.cmp .r{border-top:4px solid var(--signal)}.cmp .s{border-top:4px solid var(--green)}
.note{display:flex;gap:10px;padding:11px 14px;border-radius:8px;font-size:.92rem;background:var(--signal-soft);color:var(--signal-ink);margin:0 0 14px}
.note.info{background:var(--blue-soft);color:var(--blue)}.note.bad{background:var(--rust-soft);color:var(--rust)}.note.ok{background:var(--green-soft);color:var(--green)}
.ex-q{border:1px solid var(--line);border-radius:8px;padding:12px;margin-bottom:12px;background:var(--paper)}.ex-q p{margin-bottom:6px;font-weight:600}

/* ===== ôn tập / quiz ===== */
.stage{max-width:760px;margin:0 auto}
.flash{min-height:260px;display:flex;flex-direction:column;justify-content:center;padding:28px;text-align:left}
.flash .ans{border-top:2px dashed var(--line);margin-top:16px;padding-top:16px}
.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:14px}.grades .btn{flex-direction:column;gap:2px;padding:10px 6px}.grades small{font-weight:500;opacity:.8}
.g-1{border-color:var(--rust);color:var(--rust)}.g-3{border-color:var(--signal)}.g-4{border-color:var(--teal);color:var(--teal)}.g-5{border-color:var(--green);color:var(--green)}
.opt{display:block;width:100%;text-align:left;margin-bottom:8px;padding:12px 14px;border:1.5px solid var(--line);background:var(--card);border-radius:9px;font:inherit;cursor:pointer;color:var(--ink)}
.opt:hover{border-color:var(--ink2)}.opt.ok{border-color:var(--green);background:var(--green-soft)}.opt.no{border-color:var(--rust);background:var(--rust-soft)}.opt[disabled]{cursor:default}
.prog{height:6px;background:var(--soft);border-radius:9px;overflow:hidden;margin-bottom:16px}.prog i{display:block;height:100%;background:var(--signal)}

/* ===== sơ đồ quy trình ===== */
.route{display:flex;align-items:stretch;overflow-x:auto;padding:6px 2px 14px;gap:0}
.stop{flex:1 0 140px;position:relative;padding:34px 10px 0;text-align:center;text-decoration:none;color:var(--ink)}
.stop::before{content:"";position:absolute;top:14px;left:0;right:0;height:4px;background:repeating-linear-gradient(90deg,var(--ink2) 0 8px,transparent 8px 14px)}
.stop:first-child::before{left:50%}.stop:last-child::before{right:50%}
.stop i{position:absolute;top:2px;left:50%;margin-left:-14px;width:28px;height:28px;border-radius:50%;background:var(--c);color:#fff;font-style:normal;font-weight:800;display:grid;place-items:center;border:3px solid var(--paper);z-index:1}
.stop b{display:block;font-size:.88rem;line-height:1.3}.stop span{font-size:.8rem;color:var(--ink2)}
.stop:hover b{text-decoration:underline}
.chain{display:flex;gap:0;overflow-x:auto;padding:8px 0 12px;align-items:stretch}
.link{flex:0 0 180px;padding:10px 12px;border:1.5px solid var(--line);border-radius:8px;background:var(--card);font-size:.84rem;position:relative;margin-right:26px}
.link:not(:last-child)::after{content:"";position:absolute;right:-26px;top:50%;width:26px;border-top:2px solid var(--ink2)}
.link:not(:last-child)::before{content:"";position:absolute;right:-27px;top:calc(50% - 4px);border-left:7px solid var(--ink2);border-top:4px solid transparent;border-bottom:4px solid transparent}
.link.done{border-color:var(--green);background:var(--green-soft)}.link b{display:block;margin-bottom:2px}

/* ===== tính giá ===== */
.calc{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:18px;align-items:start}
.ladder{display:flex;flex-direction:column;gap:0}.ladder>div{display:flex;justify-content:space-between;gap:10px;padding:8px 0;border-bottom:1px solid var(--line)}
.ladder .tot{font-weight:750;font-size:1.05rem;background:var(--soft);padding:10px;border-radius:8px;border:0;margin:4px 0}
.ladder .tot.main{background:var(--ink);color:var(--paper)}
.pipe{display:flex;gap:4px;flex-wrap:wrap}
.kill{padding:12px 14px;border-radius:8px;font-weight:650}.kill.ok{background:var(--green-soft);color:var(--green)}.kill.bad{background:var(--rust-soft);color:var(--rust)}
.stage-tag{display:inline-block;padding:2px 9px;border-radius:99px;font-size:.78rem;font-weight:650;background:var(--soft)}
.stage-tag.s-end{background:var(--green-soft);color:var(--green)}.stage-tag.s-stop{background:var(--rust-soft);color:var(--rust)}

/* ===== dialog / toast ===== */
dialog.dlg{border:0;border-radius:14px;padding:0;width:min(560px,94vw);background:var(--card);color:var(--ink);box-shadow:0 30px 80px -20px rgba(0,0,0,.5);max-height:92vh}
dialog.dlg.wide{width:min(860px,95vw)}dialog::backdrop{background:rgba(7,20,26,.6)}
.dlg-in{display:flex;flex-direction:column;max-height:92vh}.dlg header{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;border-bottom:1px solid var(--line)}.dlg header h2{margin:0}
.dlg-body{padding:18px;overflow:auto}.dlg footer{display:flex;gap:8px;justify-content:flex-end;padding:12px 18px;border-top:1px solid var(--line)}
#toasts{position:fixed;right:16px;bottom:16px;display:flex;flex-direction:column;gap:8px;z-index:100}
.toast{background:var(--ink);color:var(--paper);padding:10px 16px;border-radius:9px;box-shadow:var(--shadow);font-weight:550;animation:tin .18s ease-out;max-width:340px}
.toast.err{background:var(--rust);color:#fff}.toast.out{opacity:0;transition:opacity .4s}
@keyframes tin{from{transform:translateY(8px);opacity:0}}
.tabbar{display:none}
.hide{display:none!important}

/* ===== responsive ===== */
@media(max-width:1020px){.lesson{grid-template-columns:1fr}.toc{display:none}.yard{grid-template-columns:repeat(4,1fr)}.g4{grid-template-columns:repeat(2,1fr)}.calc{grid-template-columns:1fr}.filters .frow{grid-template-columns:1fr 1fr}}
@media(max-width:820px){
  .shell{grid-template-columns:1fr}.side{position:fixed;z-index:60;width:272px;transform:translateX(-100%);transition:transform .22s;left:0}
  body.nav-open .side{transform:none}body.nav-open::after{content:"";position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:50}
  .topbar .menu-btn{display:inline-grid}.topbar{padding:8px 12px}.content{padding:18px 14px 90px}
  .g2,.g3{grid-template-columns:1fr}.fgrid{grid-template-columns:1fr}.cmp{grid-template-columns:1fr}.yard{grid-template-columns:repeat(2,1fr)}
  .tabbar{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:40;background:var(--navy);padding:4px 4px calc(4px + env(safe-area-inset-bottom))}
  .tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;gap:1px;padding:6px 2px;color:var(--navy-ink);text-decoration:none;font-size:.7rem}
  .tabbar a[aria-current="page"]{color:var(--signal)}
  h1{font-size:1.45rem}.grades{grid-template-columns:repeat(2,1fr)}.filters .frow{grid-template-columns:1fr}
}
@media(max-width:480px){.yard{grid-template-columns:repeat(2,1fr)}.cont{height:116px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media print{.side,.topbar,.tabbar,.no-print,#toasts{display:none!important}.shell{display:block}.content{padding:0;max-width:none}.card{box-shadow:none;break-inside:avoid}body{background:#fff;color:#000}}