:root{
  --bg:oklch(0.975 0.004 95);
  --surface:#fff;
  --border:oklch(0.92 0.006 265);
  --border-soft:oklch(0.955 0.005 265);
  --text:oklch(0.26 0.012 265);
  --text-soft:oklch(0.42 0.014 265);
  --muted:oklch(0.6 0.012 265);
  --muted-soft:oklch(0.68 0.012 265);
  --accent:oklch(0.55 0.14 265);
  --accent-hover:oklch(0.49 0.15 265);
  --accent-soft-bg:oklch(0.955 0.03 265);
  --accent-soft-fg:oklch(0.42 0.14 265);
  --green:oklch(0.55 0.14 155);
  --green-soft-bg:oklch(0.955 0.03 155);
  --green-soft-fg:oklch(0.42 0.1 155);
  --amber:oklch(0.52 0.13 55);
  --amber-soft-bg:oklch(0.95 0.035 65);
  --amber-soft-fg:oklch(0.48 0.12 55);
  --red:oklch(0.55 0.18 25);
  --red-soft-bg:oklch(0.95 0.04 25);
  --red-soft-fg:oklch(0.48 0.18 25);
  --teal:oklch(0.5 0.09 195);
  --font:Manrope,Helvetica,Arial,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,monospace;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{letter-spacing:-0.02em;margin:0 0 4px}
h1{font-size:29px;font-weight:800}
h2{font-size:17px;font-weight:700}
h3{font-size:15px;font-weight:700}
p{margin:0 0 12px}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-hover)}

/* ---- app shell / sidebar ---- */
body.has-sidebar{display:flex;align-items:flex-start;min-height:100vh}
.sidebar{width:264px;flex:0 0 264px;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:24px 16px;gap:26px;position:sticky;top:0;height:100vh}
.brand{display:flex;align-items:center;gap:11px;padding:0 8px;text-decoration:none;color:inherit}
.brand-mark{width:34px;height:34px;flex:0 0 34px;border-radius:10px;background:var(--accent);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:15px}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text b{font-size:15px;font-weight:800;letter-spacing:-0.01em}
.brand-text small{font-size:11px;color:var(--muted);font-weight:500}
.sidebar nav{display:flex;flex-direction:column;gap:3px}
.nav-label{font-size:10.5px;font-weight:700;letter-spacing:0.08em;color:var(--muted-soft);padding:0 10px 6px;text-transform:uppercase}
.nav-item{display:flex;align-items:center;gap:10px;padding:10px 11px;border-radius:10px;font-size:14px;font-weight:600;color:var(--text-soft)}
.nav-item:hover{background:var(--border-soft);color:var(--text)}
.nav-item.is-active{background:var(--accent-soft-bg);color:var(--accent-soft-fg)}
.sidebar-foot{margin-top:auto;display:flex;flex-direction:column;gap:12px}
.user-chip{display:flex;align-items:center;gap:10px;padding:8px 6px}
.user-avatar{width:32px;height:32px;flex:0 0 32px;border-radius:50%;background:var(--accent-soft-bg);color:var(--accent-soft-fg);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}
.user-info{line-height:1.25;min-width:0;overflow:hidden}
.user-info b{display:block;font-size:13px;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-info small{font-size:11px;color:var(--muted);font-weight:500}

main{flex:1;min-width:0;max-width:1250px;margin:0 auto;padding:36px 40px 56px}
main.bare{max-width:none;padding:0}

/* ---- headings / layout helpers ---- */
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:22px;flex-wrap:wrap}
.page-head h1{margin:0}
.muted{color:var(--muted);font-weight:500}
.small{font-size:12px}
.warning{color:var(--amber-soft-fg);font-weight:600;font-size:13.5px}
.inline{display:flex;gap:12px;align-items:end;flex-wrap:wrap}
.inline>*{flex:1;min-width:150px}
.grow{flex:3}
.row-between{display:flex;justify-content:space-between;gap:20px;align-items:start}
.compact{margin:0}
.compact select{min-width:260px;margin:0}

/* ---- cards / panels ---- */
.panel{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:22px 24px;margin:16px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}

/* ---- stat cards ---- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin:18px 0}
.stats div{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:20px}
.stats span{display:block;color:var(--text-soft);font-size:13px;font-weight:600}
.stats b{font-family:var(--mono);font-size:32px;font-weight:600;letter-spacing:-0.02em;display:block;margin-top:10px}

/* ---- forms ---- */
input,textarea,select{width:100%;background:oklch(0.985 0.003 95);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:11px 13px;font:inherit;margin-top:6px}
textarea{min-height:100px;resize:vertical}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px oklch(0.62 0.11 265 / 0.12)}
label{display:block;margin:12px 0;color:var(--text-soft);font-size:13.5px;font-weight:600}
::placeholder{color:var(--muted-soft)}

/* ---- buttons ---- */
button,.button{display:inline-flex;align-items:center;justify-content:center;gap:6px;background:var(--accent);color:#fff;border:0;border-radius:11px;padding:11px 18px;text-decoration:none;font-family:inherit;font-size:13.5px;font-weight:700;cursor:pointer;box-shadow:0 6px 16px oklch(0.55 0.14 265 / 0.22);transition:background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out,color .15s ease-in-out,filter .15s ease-in-out,transform .2s ease-out}
button:hover,.button:hover{background:var(--accent-hover)}
button:active,.button:active{filter:brightness(0.92);transform:translateY(1px)}
button:focus-visible,.button:focus-visible{outline:none;box-shadow:0 0 0 2px var(--surface),0 0 0 4px var(--accent)}
button:disabled,.button[aria-disabled=true]{opacity:0.5;cursor:not-allowed;pointer-events:none;box-shadow:none;transform:none}
.danger{background:var(--red);box-shadow:none}
.danger:hover{background:oklch(0.48 0.18 25)}
.danger:focus-visible{box-shadow:0 0 0 2px var(--surface),0 0 0 4px var(--red)}
.ghost{background:var(--surface);color:var(--text);border:1px solid var(--border);box-shadow:none}
.ghost:hover{background:var(--border-soft);border-color:oklch(0.85 0.008 265)}
.ghost:active{background:var(--border)}
.secondary{background:var(--text);box-shadow:none}
.secondary:hover{background:oklch(0.18 0.012 265)}
.w100{width:100%}
.big{font-size:15px;padding:13px 24px}
.small-btn{padding:8px 13px;font-size:12.5px;border-radius:9px;box-shadow:none}
.icon-btn{background:transparent;color:var(--muted);font-size:24px;padding:0 8px;box-shadow:none;border-radius:8px}
.icon-btn:hover{color:var(--text);background:var(--border-soft)}
.icon-btn:active{background:var(--border)}
.import-button{background:var(--amber-soft-fg);box-shadow:none}
.import-button:hover{background:oklch(0.44 0.13 55)}
.import-submit{background:oklch(0.4 0.03 265);box-shadow:none}
.import-submit:hover{background:oklch(0.3 0.03 265)}

/* ---- badges ---- */
.badge{display:inline-block;padding:5px 11px;border-radius:999px;background:var(--border-soft);color:var(--text-soft);font-size:12px;font-weight:700;margin:6px 0}
.badge.assigned{background:var(--accent-soft-bg);color:var(--accent-soft-fg)}
.badge.in_progress{background:oklch(0.94 0.05 85);color:oklch(0.48 0.13 85)}
.badge.submitted{background:var(--amber-soft-bg);color:var(--amber-soft-fg)}
.badge.checked{background:var(--green-soft-bg);color:var(--green-soft-fg)}
.badge.neutral{background:var(--border-soft);color:var(--muted)}
.score,.score-inline{color:var(--green-soft-fg);font-weight:700}
.score{font-size:22px;display:block;margin:10px 0;font-family:var(--mono)}
.score-inline{margin-left:8px;font-size:13px}
.hero-score{font-family:var(--mono);font-size:44px;font-weight:700;color:var(--accent);letter-spacing:-0.02em;margin:6px 0 20px}

/* ---- tables ---- */
.table-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:8px}
.table-scroll{overflow:auto}
table{width:100%;border-collapse:collapse}
th{text-align:left;padding:11px 14px;font-size:11px;font-weight:700;letter-spacing:0.06em;text-transform:uppercase;color:var(--muted-soft);border-bottom:1px solid var(--border)}
td{text-align:left;padding:13px 14px;border-bottom:1px solid var(--border-soft);vertical-align:top;font-size:13.5px}
tr:last-child td{border-bottom:0}
tr:hover td{background:oklch(0.985 0.004 265)}

/* ---- alerts ---- */
.alert{padding:13px 16px;border-radius:12px;margin:10px 0;font-weight:600;font-size:13.5px}
.alert.error{background:var(--red-soft-bg);color:var(--red-soft-fg)}
.alert.success{background:var(--green-soft-bg);color:var(--green-soft-fg)}

/* ---- login ---- */
.login-wrap{min-height:100vh;display:grid;place-items:center;padding:24px}
.login{width:min(400px,92vw);text-align:center}
.login h1{font-size:22px;letter-spacing:-0.01em}

/* ---- exam pages ---- */
.exam-head{margin-bottom:8px}
.question{display:flex;flex-direction:column;gap:12px}
.answer{white-space:pre-wrap;background:oklch(0.98 0.003 95);border:1px solid var(--border-soft);border-radius:12px;padding:14px;margin:8px 0 16px;font-size:13.5px}
.draft-status{color:var(--muted);font-size:12.5px;font-weight:600;margin:6px 2px}
.exam-actions{display:flex;justify-content:space-between;gap:14px;align-items:center;margin:18px 0 30px}

/* ---- preview banner ---- */
.preview-banner{display:flex;justify-content:space-between;align-items:center;gap:18px;background:oklch(0.95 0.05 300);border:1px solid oklch(0.85 0.09 300);border-radius:14px;padding:16px 18px;margin-bottom:20px}
.preview-banner b{display:block;font-size:14px;margin-bottom:4px;color:oklch(0.42 0.14 300)}
.preview-banner span{color:oklch(0.45 0.1 300);font-size:13px}
.preview-missing{outline:2px solid var(--red);outline-offset:2px;border-radius:18px}

/* ---- actions row ---- */
.actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.test-actions{min-width:360px;flex-wrap:nowrap}
.test-actions form{margin:0}

/* ---- modals ---- */
.modal{border:0;border-radius:20px;background:var(--surface);color:var(--text);width:min(760px,94vw);padding:0;box-shadow:0 24px 80px oklch(0.26 0.012 265 / 0.22)}
.modal::backdrop{background:oklch(0.26 0.012 265 / 0.45)}
.modal-body{padding:26px}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}
.password-modal{width:min(460px,94vw)}
.test-editor-modal{width:min(860px,96vw);max-height:92vh;overflow:hidden}
.test-editor-body{max-height:92vh;overflow-y:auto;padding-bottom:18px}
.sticky-actions{position:sticky;bottom:-26px;background:var(--surface);padding:14px 0 6px;border-top:1px solid var(--border-soft);z-index:3}

/* ---- test builder ---- */
.question-head{align-items:center;margin-top:18px}
.question-builder{display:grid;gap:12px;margin-top:12px}
.question-builder-item{background:oklch(0.98 0.003 95);border:1px solid var(--border);border-radius:14px;padding:14px}
.question-builder-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.question-builder-item textarea{margin-top:10px;min-height:90px}
.question-add-bottom{display:flex;justify-content:center;padding:18px 0 8px}
.question-add-bottom button{width:min(360px,100%)}
.import-form{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.import-form input[type=file]{display:none}

/* ---- assignment grid ---- */
.assign-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;max-height:320px;overflow:auto;padding:4px}
.assign-user{display:flex;align-items:center;gap:10px;background:oklch(0.98 0.003 95);border:1px solid var(--border);border-radius:12px;padding:12px;margin:0;font-size:13.5px;font-weight:600}
.assign-user input{width:auto;margin:0}
.assign-user small{margin-left:auto;color:var(--green-soft-fg);font-weight:600}
.assign-user.is-assigned{border-color:oklch(0.75 0.1 155);background:var(--green-soft-bg)}
.assigned-list{display:grid;gap:8px}
.assigned-item{display:flex;align-items:center;justify-content:space-between;gap:10px;background:oklch(0.98 0.003 95);border:1px solid var(--border-soft);border-radius:10px;padding:10px 12px}
.assigned-item .badge{margin-left:10px}

/* ---- analytics ---- */
.analytics-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}

/* ---- scrollbar ---- */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:oklch(0.88 0.008 265);border-radius:20px;border:3px solid transparent;background-clip:content-box}

@media(max-width:900px){
  body.has-sidebar{display:block}
  .sidebar{position:static;width:auto;height:auto;flex-direction:row;align-items:center;padding:14px 16px;gap:16px;overflow:auto}
  .sidebar nav{flex-direction:row}
  .nav-label{display:none}
  .sidebar-foot{margin-top:0;flex-direction:row;align-items:center}
  .sidebar-foot form{margin:0}
  main{padding:20px}
  .analytics-grid{grid-template-columns:1fr}
  .page-head{align-items:flex-start;flex-direction:column}
  .actions{width:100%}
  .actions .button,.actions button{flex:1;text-align:center}
  .assigned-item{align-items:flex-start}
  .modal-body{padding:18px}
  .inline{display:block}
  .row-between{display:block}
  table{display:block;overflow:auto}
  .test-actions{min-width:0;flex-wrap:wrap}
  .test-actions button{flex:1}
  .exam-actions{flex-direction:column}
  .exam-actions button{width:100%}
  .preview-banner{align-items:stretch;flex-direction:column}
  .preview-banner .button{text-align:center}
  .import-form{width:100%}
  .import-form .button,.import-form button{flex:1;text-align:center}
}