/* PIQ design system — minimal, mobile-first */
:root{
  --bg:#f7f7f8; --surface:#fff; --surface-2:#f2f2f4; --line:#e6e6ea; --line-2:#d9d9df;
  --text:#16161a; --muted:#6b6b76; --faint:#9a9aa5;
  --accent:#4f46e5; --accent-2:#6366f1; --accent-soft:#eef0ff; --on-accent:#fff;
  --ok:#12a150; --ok-soft:#e7f7ee; --warn:#d97706; --warn-soft:#fff4e0; --bad:#dc2626; --bad-soft:#fdeaea;
  --r:14px; --r-sm:10px; --shadow:0 1px 2px rgba(20,20,30,.04),0 8px 24px rgba(20,20,30,.06);
  --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans","Noto Sans Devanagari",Helvetica,Arial,sans-serif;
  --tab-h:64px;
}
:root[data-theme=dark]{
  --bg:#0d0d10; --surface:#16161a; --surface-2:#1e1e24; --line:#26262d; --line-2:#33333c;
  --text:#ededf0; --muted:#9a9aa6; --faint:#6d6d78;
  --accent:#818cf8; --accent-2:#a5b4fc; --accent-soft:#1f2040; --on-accent:#0d0d10;
  --ok:#3ecf8e; --ok-soft:#10261c; --warn:#fbbf24; --warn-soft:#2b2110; --bad:#f87171; --bad-soft:#2d1515;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.55 var(--font);-webkit-font-smoothing:antialiased;transition:background .25s,color .25s}
a{color:var(--accent);text-decoration:none} a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.25;margin:0 0 .5em;letter-spacing:-.01em} h1{font-size:1.6rem} h2{font-size:1.2rem} h3{font-size:1.02rem}
p{margin:0 0 .8em} .muted{color:var(--muted)} .faint{color:var(--faint)} .small{font-size:.85rem} .tiny{font-size:.75rem}
.grow{flex:1} .row{display:flex;align-items:center;gap:10px;flex-wrap:wrap} .col{display:flex;flex-direction:column;gap:10px}
.between{justify-content:space-between} .center{text-align:center} .mt{margin-top:18px} .mt-s{margin-top:8px} .mb{margin-bottom:18px}
.ic{flex:none;vertical-align:middle}
.hide-sm{display:inline}
[hidden]{display:none!important}
::selection{background:var(--accent);color:var(--on-accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:42px;padding:0 18px;border-radius:var(--r-sm);border:1px solid var(--line-2);background:var(--surface);color:var(--text);font:600 .92rem var(--font);cursor:pointer;transition:transform .12s,background .15s,border-color .15s,box-shadow .15s;text-decoration:none!important;white-space:nowrap}
.btn:hover{background:var(--surface-2)} .btn:active{transform:scale(.97)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)} .btn.primary:hover{filter:brightness(1.08)}
.btn.soft{background:var(--accent-soft);border-color:transparent;color:var(--accent)}
.btn.ok{background:var(--ok-soft);border-color:transparent;color:var(--ok)}
.btn.danger{color:var(--bad)} .btn.danger.fill{background:var(--bad);border-color:var(--bad);color:#fff}
.btn.ghost{background:transparent;border-color:transparent} .btn.ghost:hover{background:var(--surface-2)}
.btn.sm{height:34px;padding:0 12px;font-size:.84rem} .btn.block{width:100%} .btn[disabled]{opacity:.5;pointer-events:none}
.icon-btn{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:12px;border:0;background:transparent;color:var(--text);cursor:pointer;transition:background .15s}
.icon-btn:hover{background:var(--surface-2)}
.if-dark{display:none} [data-theme=dark] .if-dark{display:inline-flex} [data-theme=dark] .if-light{display:none}

/* forms */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field>label,.lbl{font-size:.82rem;font-weight:600;color:var(--muted)}
.input,.select,.textarea{width:100%;height:44px;padding:0 14px;border:1px solid var(--line-2);border-radius:var(--r-sm);background:var(--surface);color:var(--text);font:inherit;transition:border-color .15s,box-shadow .15s}
.textarea{height:auto;padding:12px 14px;min-height:96px;resize:vertical}
.select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none' stroke='%239a9aa5' stroke-width='2'%3E%3Cpath d='M1 1.5l5 5 5-5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:36px}
.input:focus,.select:focus,.textarea:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.input::placeholder{color:var(--faint)}
.hint{font-size:.78rem;color:var(--faint)}
.input-wrap{position:relative} .input-wrap .input{padding-right:46px}
.input-wrap button{position:absolute;right:4px;top:2px;height:40px;width:40px;border:0;background:none;color:var(--muted);cursor:pointer}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:520px){.two{grid-template-columns:1fr}}

/* toggle switch */
.switch{position:relative;display:inline-block;width:46px;height:28px;flex:none}
.switch input{position:absolute;inset:0;opacity:0;margin:0;cursor:pointer;z-index:2}
.switch i{position:absolute;inset:0;border-radius:99px;background:var(--line-2);transition:background .2s}
.switch i:after{content:"";position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.25);transition:transform .22s cubic-bezier(.3,.7,.3,1.2)}
.switch input:checked+i{background:var(--accent)} .switch input:checked+i:after{transform:translateX(18px)}
.switch input:focus-visible+i{outline:2px solid var(--accent);outline-offset:2px}
.switch-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px solid var(--line);cursor:pointer}
.switch-row:last-child{border-bottom:0}
.sr-text{display:flex;flex-direction:column;gap:2px} .sr-text small{color:var(--muted);font-size:.8rem}
/* segmented control */
.seg{display:inline-flex;background:var(--surface-2);border-radius:12px;padding:3px;gap:2px;max-width:100%;overflow-x:auto;scrollbar-width:none}
.seg::-webkit-scrollbar{display:none}
.seg a,.seg button{border:0;background:transparent;color:var(--muted);font:600 .84rem var(--font);padding:8px 14px;border-radius:9px;cursor:pointer;white-space:nowrap;text-decoration:none!important}
.seg .on{background:var(--surface);color:var(--text);box-shadow:0 1px 3px rgba(0,0,0,.08)}
/* chips */
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border-radius:99px;border:1px solid var(--line-2);background:var(--surface);color:var(--text);font:600 .82rem var(--font);cursor:pointer;text-decoration:none!important;transition:.15s;white-space:nowrap}
.chip:hover{border-color:var(--accent)} .chip.on{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.chips.scroll .chip{flex:none}
.chips.scroll{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;margin:0;padding:2px 0;max-width:100%} .chips.scroll::-webkit-scrollbar{display:none}
.badge{display:inline-flex;align-items:center;gap:4px;padding:2px 9px;border-radius:99px;font-size:.72rem;font-weight:700;background:var(--surface-2);color:var(--muted)}
.badge.ok{background:var(--ok-soft);color:var(--ok)} .badge.warn{background:var(--warn-soft);color:var(--warn)} .badge.bad{background:var(--bad-soft);color:var(--bad)} .badge.acc{background:var(--accent-soft);color:var(--accent)}

/* cards */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow)}
.card.flat{box-shadow:none} .card.tight{padding:12px 14px}
a.card{display:block;color:inherit;text-decoration:none!important;transition:transform .15s,border-color .15s} a.card:hover{border-color:var(--accent);transform:translateY(-1px)}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.grid.stats{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.stat b{display:block;font-size:1.7rem;letter-spacing:-.02em;line-height:1.1} .stat span{color:var(--muted);font-size:.8rem;font-weight:600}
.list{display:flex;flex-direction:column}
.item{display:flex;align-items:center;gap:12px;padding:14px 4px;border-bottom:1px solid var(--line);color:inherit;text-decoration:none!important}
.item:last-child{border-bottom:0} a.item:hover .t{color:var(--accent)}
.item .t{font-weight:600} .item .s{color:var(--muted);font-size:.82rem}
.empty{text-align:center;padding:42px 16px;color:var(--muted)} .empty .ic{opacity:.5;margin-bottom:8px}

/* progress */
.bar{height:7px;border-radius:99px;background:var(--surface-2);overflow:hidden} .bar i{display:block;height:100%;border-radius:99px;background:var(--accent);transition:width .5s cubic-bezier(.3,.7,.3,1)}
.bar.ok i{background:var(--ok)} .bar.lg{height:10px}
.ring{position:relative;flex:none} .ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring circle{fill:none;stroke-width:3.2} .ring-bg{stroke:var(--surface-2)} .ring-fg{stroke:var(--accent);stroke-linecap:round;transition:stroke-dasharray .6s}
.ring span{position:absolute;inset:0;display:grid;place-items:center;font-weight:700;font-size:.95rem}

/* shells: user */
.topbar{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--line)}
.topbar-in{max-width:1040px;margin:auto;padding:8px 16px;display:flex;align-items:center;gap:6px;padding-top:max(8px,env(safe-area-inset-top))}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text)!important;text-decoration:none!important;font-size:1.05rem}
.logo{width:30px;height:30px;border-radius:9px;background:var(--accent);color:var(--on-accent);display:grid;place-items:center;font-weight:800}
.brand em{font-style:normal;font-size:.7rem;color:var(--muted);border:1px solid var(--line-2);border-radius:99px;padding:0 7px}
.topnav{display:flex;gap:2px;margin-left:18px} .topnav a{padding:8px 14px;border-radius:10px;color:var(--muted);font-weight:600;font-size:.9rem;text-decoration:none!important} .topnav a:hover{background:var(--surface-2)} .topnav a.on{color:var(--text);background:var(--surface-2)}
.wrap{max-width:1040px;margin:auto;padding:22px 16px calc(var(--tab-h) + 28px + env(safe-area-inset-bottom))}
.tabbar{display:none}
@media(max-width:720px){
  .topnav{display:none}
  .tabbar{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;left:0;right:0;bottom:0;z-index:30;height:calc(var(--tab-h) + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:color-mix(in srgb,var(--surface) 90%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--line)}
  .tabbar a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--faint);font-size:.68rem;font-weight:600;text-decoration:none!important}
  .tabbar a.on{color:var(--accent)}
  .hide-sm{display:none}
  h1{font-size:1.4rem}
}
@media(min-width:721px){.wrap{padding-bottom:60px}}

/* shells: admin */
.admin{display:flex;min-height:100vh}
.side{width:236px;flex:none;background:var(--surface);border-right:1px solid var(--line);padding:18px 12px;display:flex;flex-direction:column;gap:18px;position:sticky;top:0;height:100vh}
.side .brand{padding:0 8px} .side nav{display:flex;flex-direction:column;gap:2px}
.side nav a{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:10px;color:var(--muted);font-weight:600;font-size:.9rem;text-decoration:none!important} .side nav a:hover{background:var(--surface-2)} .side nav a.on{background:var(--accent-soft);color:var(--accent)}
.admin-main{flex:1;min-width:0}
.admin-top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:8px;padding:8px 16px;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.admin-body{padding:22px 20px 60px;max-width:1180px}
.menu-btn{display:none} .scrim{display:none}
@media(max-width:900px){
  .menu-btn{display:inline-grid}
  .side{position:fixed;z-index:60;left:0;top:0;bottom:0;transform:translateX(-102%);transition:transform .28s cubic-bezier(.3,.7,.2,1);box-shadow:var(--shadow)}
  body.drawer .side{transform:none}
  .scrim{position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:50;opacity:0;pointer-events:none;transition:opacity .25s;display:block}
  body.drawer .scrim{opacity:1;pointer-events:auto}
  .admin-body{padding:18px 14px 60px}
}
.page-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:18px} .page-head h1{margin:0}
.crumbs{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:.86rem;color:var(--muted);margin-bottom:10px} .crumbs a{color:var(--muted)} .crumbs a:hover{color:var(--accent)} .crumbs b{color:var(--text)}

/* tables → cards on mobile */
.tbl{width:100%;border-collapse:collapse;font-size:.9rem}
.tbl th{text-align:left;font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--faint);padding:10px 12px;border-bottom:1px solid var(--line)}
.tbl td{padding:12px;border-bottom:1px solid var(--line);vertical-align:middle} .tbl tr:last-child td{border-bottom:0}
.tbl tr:hover td{background:color-mix(in srgb,var(--surface-2) 55%,transparent)}
.tbl .act{text-align:right;white-space:nowrap}
.tbl-wrap{overflow-x:auto;border-radius:var(--r)}
@media(max-width:860px){
  .tbl.stack thead{display:none} .tbl.stack,.tbl.stack tbody,.tbl.stack tr,.tbl.stack td{display:block;width:100%}
  .tbl.stack tr{padding:12px 4px;border-bottom:1px solid var(--line)} .tbl.stack td{border:0;padding:3px 8px}
  .tbl.stack td[data-l]:before{content:attr(data-l) ": ";color:var(--faint);font-size:.75rem;font-weight:600}
  .tbl.stack .act{text-align:left;padding-top:8px}
}

/* toasts */
.toasts{position:fixed;z-index:200;top:14px;right:14px;display:flex;flex-direction:column;gap:10px;width:min(380px,calc(100vw - 28px));pointer-events:none}
.toast{pointer-events:auto;display:flex;gap:12px;align-items:flex-start;padding:13px 14px;border-radius:14px;background:var(--surface);border:1px solid var(--line);box-shadow:0 10px 32px rgba(0,0,0,.16);animation:tin .35s cubic-bezier(.2,.9,.3,1.1) both;position:relative;overflow:hidden}
.toast .ti{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;flex:none;background:var(--accent-soft);color:var(--accent)}
.toast.success .ti{background:var(--ok-soft);color:var(--ok)} .toast.error .ti{background:var(--bad-soft);color:var(--bad)} .toast.warn .ti{background:var(--warn-soft);color:var(--warn)}
.toast .tm{flex:1;font-weight:500;font-size:.9rem;padding-top:3px} .toast button{border:0;background:none;color:var(--faint);cursor:pointer;padding:2px}
.toast:after{content:"";position:absolute;left:0;bottom:0;height:2px;background:var(--accent);animation:tbar var(--d,4s) linear forwards}
.toast.success:after{background:var(--ok)} .toast.error:after{background:var(--bad)}
.toast.out{animation:tout .25s ease forwards}
@keyframes tin{from{opacity:0;transform:translateY(-14px) scale(.96)}to{opacity:1;transform:none}}
@keyframes tout{to{opacity:0;transform:translateX(24px)}} @keyframes tbar{from{width:100%}to{width:0}}
@media(max-width:720px){.toasts{top:auto;bottom:calc(var(--tab-h) + 12px + env(safe-area-inset-bottom));right:14px}}
body.shell-admin .toasts,body.shell-auth .toasts{top:14px;bottom:auto}

/* modal */
.modal{position:fixed;inset:0;z-index:100;background:rgba(10,10,14,.5);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;padding:16px;animation:fade .2s both}
.modal-card{width:min(520px,100%);max-height:calc(100vh - 32px);overflow:auto;background:var(--surface);border-radius:20px;border:1px solid var(--line);box-shadow:0 24px 64px rgba(0,0,0,.3);animation:pop .28s cubic-bezier(.2,.9,.3,1.1) both}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 18px 4px} .modal-head h3{margin:0;font-size:1.1rem} .modal-body{padding:10px 18px 20px}
@keyframes fade{from{opacity:0}} @keyframes pop{from{opacity:0;transform:translateY(18px) scale(.97)}}
@media(max-width:560px){.modal{align-items:flex-end;padding:0}.modal-card{border-radius:22px 22px 0 0;width:100%;max-height:92vh;animation:sheet .3s cubic-bezier(.2,.9,.3,1) both}}
@keyframes sheet{from{transform:translateY(100%)}}

/* skeleton + misc */
.skel{background:linear-gradient(90deg,var(--surface-2) 25%,var(--line) 37%,var(--surface-2) 63%);background-size:400% 100%;animation:sk 1.3s infinite;border-radius:8px;min-height:14px}
@keyframes sk{0%{background-position:100% 50%}100%{background-position:0 50%}}
.fade-in{animation:fade .4s both} .rise{animation:rise .45s cubic-bezier(.2,.8,.3,1) both} @keyframes rise{from{opacity:0;transform:translateY(10px)}}
.spin{width:16px;height:16px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:rot .7s linear infinite;display:inline-block} @keyframes rot{to{transform:rotate(360deg)}}
.divider{height:1px;background:var(--line);margin:16px 0}
.kbd{font:600 .72rem var(--font);border:1px solid var(--line-2);border-bottom-width:2px;border-radius:6px;padding:1px 6px;color:var(--muted)}
.alert{padding:12px 14px;border-radius:12px;background:var(--accent-soft);color:var(--accent);font-size:.88rem;margin-bottom:14px}
.alert.warn{background:var(--warn-soft);color:var(--warn)} .alert.bad{background:var(--bad-soft);color:var(--bad)}

/* auth */
.shell-auth{display:grid;place-items:center;min-height:100vh;padding:20px;background:radial-gradient(1200px 500px at 50% -10%,var(--accent-soft),transparent 70%),var(--bg)}
.auth{width:min(420px,100%)} .auth .card{padding:28px 24px} .auth .brand{margin-bottom:22px;justify-content:center;width:100%}
.auth h1{font-size:1.4rem;margin-bottom:4px}
.auth-foot{text-align:center;margin-top:16px;font-size:.88rem;color:var(--muted)}
.theme-float{position:fixed;top:12px;right:12px}

/* hero / landing */
.hero{padding:56px 0 30px;text-align:center;max-width:640px;margin:auto} .hero h1{font-size:clamp(2rem,6vw,3.2rem);letter-spacing:-.03em;margin-bottom:14px} .hero p{color:var(--muted);font-size:1.05rem}
.feat{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin-top:34px} .feat .card{box-shadow:none}
.feat .ic{color:var(--accent);margin-bottom:8px}

/* rich content (Q&A) */
.rich{font-size:1rem;line-height:1.7;word-wrap:break-word;overflow-wrap:anywhere}
.rich>*:first-child{margin-top:0} .rich>*:last-child{margin-bottom:0}
.rich h2{font-size:1.25rem;margin:1.1em 0 .4em} .rich h3{font-size:1.1rem;margin:1em 0 .35em} .rich h4{font-size:1rem;margin:1em 0 .3em}
.rich ul,.rich ol{padding-left:1.4em;margin:.5em 0} .rich li{margin:.2em 0}
.rich blockquote{margin:1em 0;padding:.4em 1em;border-left:3px solid var(--accent);background:var(--surface-2);border-radius:0 10px 10px 0;color:var(--muted)}
.rich pre{background:var(--surface-2);border:1px solid var(--line);border-radius:12px;padding:12px 14px;overflow:auto;font-size:.88rem}
.rich code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em} .rich :not(pre)>code{background:var(--surface-2);padding:2px 6px;border-radius:6px}
.rich table{border-collapse:collapse;margin:1em 0;display:block;overflow-x:auto;max-width:100%}
.rich th,.rich td{border:1px solid var(--line-2);padding:8px 12px;min-width:72px;overflow-wrap:normal;word-break:normal;vertical-align:top} .rich th{background:var(--surface-2);text-align:left}
.rich img{max-width:100%;height:auto;border-radius:12px;margin:.5em 0;display:block}
.rich hr{border:0;border-top:1px solid var(--line);margin:1.2em 0} .rich mark{background:#fde68a;color:#111;padding:0 3px;border-radius:3px}
.rich a{text-decoration:underline}
.files{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.filechip{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--line-2);border-radius:10px;font-size:.84rem;font-weight:600;color:var(--text);background:var(--surface);max-width:100%}
.filechip span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:220px} .filechip small{color:var(--faint);font-weight:500} .filechip button{border:0;background:none;color:var(--bad);cursor:pointer;padding:0;display:inline-grid}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin-top:12px} .gallery img{width:100%;height:130px;object-fit:cover;border-radius:12px;border:1px solid var(--line);cursor:zoom-in}

/* study view */
.qa-block{border-radius:var(--r);border:1px solid var(--line);background:var(--surface);padding:20px}
.qa-label{display:inline-flex;align-items:center;gap:8px;font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.qa-block.ans .qa-label{color:var(--ok)}
.study-bar{position:sticky;bottom:calc(var(--tab-h) + env(safe-area-inset-bottom) + 8px);z-index:20;display:flex;gap:8px;align-items:center;padding:10px;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);margin-top:18px}
@media(min-width:721px){.study-bar{bottom:16px}}
.qa-row{display:flex;gap:12px;align-items:flex-start;padding:14px 4px;border-bottom:1px solid var(--line);color:inherit;text-decoration:none!important}
.qa-row:hover .qt{color:var(--accent)} .qa-row .qt{font-weight:600;line-height:1.4}
.tick{width:24px;height:24px;border-radius:50%;border:2px solid var(--line-2);display:grid;place-items:center;flex:none;color:transparent;margin-top:1px;transition:.2s}
.tick.on{background:var(--ok);border-color:var(--ok);color:#fff}
.lightbox{position:fixed;inset:0;z-index:150;background:rgba(0,0,0,.88);display:grid;place-items:center;padding:16px;cursor:zoom-out;animation:fade .2s both} .lightbox img{max-width:100%;max-height:100%;border-radius:10px}

/* protection layer */
.protected .rich,.protected .qa-block,.protected .qa-row,.protected .item,.protected .card{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.protected input,.protected textarea,.protected select{-webkit-user-select:text;user-select:text}
.protected img{-webkit-user-drag:none;user-drag:none;pointer-events:auto}
#wm{position:fixed;inset:0;z-index:90;pointer-events:none;opacity:.11;background-repeat:repeat}
[data-theme=dark] #wm{opacity:.16}
#blackout{position:fixed;inset:0;z-index:300;background:var(--bg);display:none;place-items:center;text-align:center;padding:24px;color:var(--muted)}
#blackout.on{display:grid}
@media print{body.protected *{display:none!important} body.protected:before{content:"Printing is disabled.";display:block;font:20px sans-serif;padding:40px}}

/* editor */
.ed{border:1px solid var(--line-2);border-radius:var(--r-sm);background:var(--surface);overflow:hidden}
.ed:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.ed-bar{display:flex;flex-wrap:wrap;gap:2px;padding:6px;border-bottom:1px solid var(--line);background:var(--surface-2);position:sticky;top:0;z-index:5}
.ed-bar button,.ed-bar select{height:34px;min-width:34px;border:0;border-radius:8px;background:transparent;color:var(--text);font:700 .82rem var(--font);cursor:pointer;padding:0 8px;display:inline-grid;place-items:center}
.ed-bar button:hover,.ed-bar select:hover{background:var(--line)} .ed-bar button.on{background:var(--accent-soft);color:var(--accent)}
.ed-bar .sep{width:1px;background:var(--line-2);margin:6px 4px}
.ed-area{min-height:150px;padding:14px;outline:0;font-size:1rem;line-height:1.65;overflow-wrap:anywhere}
.ed-area:empty:before{content:attr(data-ph);color:var(--faint)}
.ed-area img{max-width:100%;border-radius:10px} .ed-area table{border-collapse:collapse} .ed-area td,.ed-area th{border:1px solid var(--line-2);padding:6px 10px;min-width:40px}
.ed-area pre{background:var(--surface-2);padding:10px;border-radius:10px}
.ed-status{font-size:.75rem;color:var(--faint);padding:4px 12px 8px}
.drop{border:1.5px dashed var(--line-2);border-radius:var(--r-sm);padding:14px;text-align:center;color:var(--muted);font-size:.85rem;cursor:pointer;transition:.15s}
.drop:hover,.drop.over{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}

/* admin dashboard mini chart */
.spark{display:flex;align-items:flex-end;gap:6px;height:110px}
.spark div{flex:1;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:6px;height:100%}
.spark i{display:block;width:100%;max-width:28px;background:var(--accent);opacity:.85;border-radius:6px 6px 3px 3px;min-height:3px;transition:height .6s}
.spark span{font-size:.62rem;color:var(--faint)}
.hstack{display:flex;gap:14px;flex-wrap:wrap} .hstack>*{flex:1;min-width:280px}
.avatar{width:36px;height:36px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-weight:800;flex:none}

/* table action cells: forms + buttons sit on one centred line */
.tbl .act{display:table-cell}.tbl .act>form,.tbl .act>.btn{display:inline-flex;align-items:center;vertical-align:middle;margin:0 0 0 6px}.tbl .act>:first-child{margin-left:0}
@media(max-width:860px){.tbl.stack .act{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.tbl.stack .act>form,.tbl.stack .act>.btn{margin:0}}