/* ExamPortal component styles (Tailwind utilities come from the CDN build in header.php) */
:root{--bg:#f4f6fb;--surface:#fff;--text:#0f172a;--muted:#64748b;--line:#e2e8f0;--brand:#4f46e5;--brand-d:#4338ca;--hover:#f1f5f9;--ok:#16a34a;--danger:#dc2626;--sbw:16rem;--sat:env(safe-area-inset-top,0px);--sab:env(safe-area-inset-bottom,0px);--sal:env(safe-area-inset-left,0px);--sar:env(safe-area-inset-right,0px)}
.dark{--bg:#0b1020;--surface:#131a2e;--text:#e5e9f5;--muted:#94a3b8;--line:#243049;--hover:#1b2440;--brand:#6366f1;--brand-d:#818cf8}
*{box-sizing:border-box}[hidden]{display:none!important}#sb-toggle{display:none}@media(min-width:1024px){#sb-toggle{display:inline-flex}}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.5;-webkit-tap-highlight-color:transparent}
.muted{color:var(--muted)}.muted-bg{background:var(--hover);color:var(--muted)}.b-line{border-color:var(--line)}
.hover-bg:hover{background:var(--hover)}
a{color:inherit}.link{color:var(--brand)}.link:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.skip-link{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:.5rem 1rem;z-index:100}.skip-link:focus{left:0}

/* ---- App chrome ---- */
.sidebar{display:none}
.content-wrap{min-height:100vh}
.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:calc(.5rem + var(--sat)) calc(1rem + var(--sar)) .5rem calc(1rem + var(--sal));background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);min-height:3.5rem}
.page-main{padding:1rem calc(1rem + var(--sar)) calc(5.75rem + var(--sab)) calc(1rem + var(--sal));max-width:80rem;margin:0 auto}
.bottom-nav{position:fixed;left:0;right:0;bottom:0;z-index:40;display:flex;background:var(--surface);border-top:1px solid var(--line);padding:.25rem var(--sar) calc(.25rem + var(--sab)) var(--sal)}
.bn-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:3.5rem;font-size:.7rem;color:var(--muted);background:none;border:0;cursor:pointer;text-decoration:none;border-radius:.75rem}
.bn-item.active{color:var(--brand);font-weight:600}
@media(min-width:1024px){
  .sidebar{display:flex;flex-direction:column;position:fixed;inset:0 auto 0 0;width:var(--sbw);background:var(--surface);border-right:1px solid var(--line);z-index:35;transition:width .15s}
  .content-wrap{padding-left:var(--sbw);transition:padding .15s}
  .bottom-nav,.sheet{display:none!important}
  .page-main{padding-bottom:2rem;padding-top:1.5rem}
  .sb-collapsed{--sbw:4.5rem}
  .sb-collapsed .sb-label{display:none}
  .sb-collapsed .sb-link{justify-content:center}
}
.sb-brand{display:flex;align-items:center;gap:.75rem;padding:1rem 1.25rem;border-bottom:1px solid var(--line)}
.sb-nav{flex:1;overflow-y:auto;padding:.75rem;display:flex;flex-direction:column;gap:2px}
.sb-link{display:flex;align-items:center;gap:.75rem;padding:.6rem .75rem;border-radius:.65rem;font-size:.9rem;color:var(--muted);text-decoration:none;background:none;border:0;cursor:pointer;text-align:left}
.sb-link:hover{background:var(--hover);color:var(--text)}
.sb-link.active{background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand);font-weight:600}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;border-radius:.65rem;background:none;border:0;color:inherit;cursor:pointer}
.icon-btn:hover{background:var(--hover)}
.avatar{display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:9999px;background:var(--brand);color:#fff;font-weight:600;font-size:.85rem}
.notif-dot{position:absolute;top:2px;right:2px;min-width:1.1rem;height:1.1rem;border-radius:9999px;background:var(--danger);color:#fff;font-size:.65rem;display:flex;align-items:center;justify-content:center;padding:0 3px}
.dropdown-panel{position:absolute;right:0;top:calc(100% + .35rem);background:var(--surface);border:1px solid var(--line);border-radius:.85rem;box-shadow:0 10px 30px rgba(15,23,42,.15);z-index:50;overflow:hidden}
.dropdown-panel[hidden]{display:none}
.sheet{position:fixed;inset:0;z-index:60}.sheet[hidden]{display:none}
.sheet-backdrop{position:absolute;inset:0;background:rgba(15,23,42,.5)}
.sheet-body{position:absolute;left:0;right:0;bottom:0;background:var(--surface);border-radius:1.25rem 1.25rem 0 0;padding:1rem 1rem calc(1rem + var(--sab));max-height:80vh;overflow:auto}
.sheet-link{display:flex;align-items:center;gap:.6rem;padding:.85rem;border:1px solid var(--line);border-radius:.85rem;text-decoration:none;font-size:.9rem;min-height:3rem}
.sheet-link.active{border-color:var(--brand);color:var(--brand)}

/* ---- Components ---- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:1rem;box-shadow:0 1px 2px rgba(15,23,42,.04)}
.card-h{padding:.9rem 1.1rem;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:.5rem;flex-wrap:wrap}
.card-b{padding:1.1rem}
.stat-icon{width:2.75rem;height:2.75rem;border-radius:.85rem;background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand);display:flex;align-items:center;justify-content:center;flex:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;padding:.55rem 1rem;min-height:2.5rem;border-radius:.65rem;font-weight:500;font-size:.9rem;border:1px solid transparent;cursor:pointer;text-decoration:none;transition:background .12s,opacity .12s;line-height:1.2}
.btn:disabled,.btn[aria-disabled=true]{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover:not(:disabled){background:var(--brand-d)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text)}.btn-ghost:hover{background:var(--hover)}
.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{opacity:.9}
.btn-danger-outline{border-color:var(--danger);color:var(--danger);background:transparent}
.btn-ok{background:var(--ok);color:#fff}
.btn-sm{padding:.3rem .7rem;min-height:2rem;font-size:.8rem}
.label{display:block;font-size:.85rem;font-weight:500;margin-bottom:.3rem}
.input,.select,.textarea{width:100%;background:var(--surface);color:var(--text);border:1px solid var(--line);border-radius:.65rem;padding:.55rem .8rem;min-height:2.6rem;font:inherit;font-size:1rem}
.textarea{min-height:6rem;resize:vertical}
.input:focus,.select:focus,.textarea:focus{outline:2px solid color-mix(in srgb,var(--brand) 55%,transparent);border-color:var(--brand)}
.pw-wrap{position:relative}
.pw-wrap .input{padding-right:2.75rem}
.pw-toggle{position:absolute;right:.35rem;top:50%;transform:translateY(-50%);display:inline-flex;align-items:center;justify-content:center;width:2.15rem;height:2.15rem;border:0;border-radius:.5rem;background:transparent;color:var(--muted);cursor:pointer;padding:0}
.pw-toggle:hover{background:var(--hover);color:var(--text)}
.pw-toggle:focus-visible{outline:2px solid var(--brand);outline-offset:1px}
.hint{font-size:.78rem;color:var(--muted);margin-top:.25rem}
.field-error{color:var(--danger);font-size:.8rem;margin-top:.25rem}
.alert{padding:.75rem 1rem;border-radius:.75rem;font-size:.9rem;border:1px solid}
.alert-error{background:#fef2f2;border-color:#fecaca;color:#991b1b}.dark .alert-error{background:#2a1215;border-color:#7f1d1d;color:#fca5a5}
.alert-info{background:#eff6ff;border-color:#bfdbfe;color:#1e40af}.dark .alert-info{background:#0f1c3a;border-color:#1e3a8a;color:#93c5fd}
.alert-warn{background:#fffbeb;border-color:#fde68a;color:#92400e}.dark .alert-warn{background:#2b2108;border-color:#78350f;color:#fcd34d}
.badge{display:inline-block;padding:.1rem .55rem;border-radius:9999px;font-size:.72rem;font-weight:600;white-space:nowrap}
.badge-gray{background:var(--hover);color:var(--muted)}.badge-green{background:#dcfce7;color:#166534}.badge-amber{background:#fef3c7;color:#92400e}.badge-red{background:#fee2e2;color:#991b1b}.badge-blue{background:#dbeafe;color:#1e40af}
.dark .badge-green{background:#052e16;color:#86efac}.dark .badge-amber{background:#3b2a07;color:#fcd34d}.dark .badge-red{background:#3a1010;color:#fca5a5}.dark .badge-blue{background:#0f2447;color:#93c5fd}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.tbl{width:100%;border-collapse:collapse;font-size:.88rem}
.tbl th{text-align:left;font-size:.72rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);padding:.65rem .9rem;border-bottom:1px solid var(--line);white-space:nowrap}
.tbl td{padding:.7rem .9rem;border-bottom:1px solid var(--line);vertical-align:middle}
.tbl tbody tr:hover{background:var(--hover)}
@media(max-width:639px){
  .tbl-cards thead{display:none}
  .tbl-cards,.tbl-cards tbody,.tbl-cards tr,.tbl-cards td{display:block;width:100%}
  .tbl-cards tr{border:1px solid var(--line);border-radius:.85rem;margin:.6rem;width:auto;padding:.4rem .2rem;background:var(--surface)}
  .tbl-cards td{border:0;display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;padding:.35rem .8rem;text-align:right}
  .tbl-cards td > *{min-width:0;max-width:70%;overflow-wrap:anywhere}
  .tbl-cards td::before{content:attr(data-label);color:var(--muted);font-size:.75rem;text-align:left;flex:0 0 auto;max-width:30%}
  .tbl-cards td[data-label=""]::before,.tbl-cards td:not([data-label])::before{content:none}
  .tbl-cards td.actions{justify-content:flex-end;flex-wrap:wrap}
  .tbl-cards td.actions > *{max-width:100%}
  /* Tables inside cards: avoid double inset margins on mobile cards */
  .card > .table-wrap .tbl-cards tr{margin-left:.65rem;margin-right:.65rem}
  .card > .table-wrap .tbl-cards tr:first-child{margin-top:.65rem}
  .card > .table-wrap .tbl-cards tr:last-child{margin-bottom:.65rem;border-bottom:1px solid var(--line)}
}

/* ---- Modern datetime picker ---- */
.dtp{position:relative}
.dtp-field{position:relative;display:flex;align-items:stretch;gap:.4rem}
.dtp-trigger{flex:1;display:flex;align-items:center;gap:.7rem;width:100%;min-height:3rem;padding:.65rem .9rem;border:1.5px solid var(--line);border-radius:.9rem;background:var(--surface);color:var(--text);cursor:pointer;text-align:left;font:inherit;transition:border-color .12s,box-shadow .12s,background .12s}
.dtp-trigger:hover{border-color:color-mix(in srgb,var(--brand) 40%,var(--line));background:var(--hover)}
.dtp.open .dtp-trigger,.dtp-trigger:focus-visible{border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 22%,transparent);outline:none}
.dtp-ico{display:inline-flex;align-items:center;justify-content:center;width:2.15rem;height:2.15rem;border-radius:.7rem;background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand);flex:none}
.dtp-display{flex:1;min-width:0;font-size:.92rem;font-weight:600;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dtp.has-value .dtp-display{color:var(--text)}
.dtp-caret{color:var(--muted);transform:rotate(90deg);flex:none;transition:transform .15s}
.dtp.open .dtp-caret{transform:rotate(-90deg)}
.dtp-clear{flex:none;width:2.5rem;border:1.5px solid var(--line);border-radius:.9rem;background:var(--surface);color:var(--muted);font-size:1.25rem;line-height:1;cursor:pointer}
.dtp-clear:hover{color:var(--danger);border-color:color-mix(in srgb,var(--danger) 40%,var(--line))}
.dtp-pop{position:absolute;z-index:40;top:calc(100% + .4rem);left:0;width:min(100%,20.5rem);padding:.9rem;background:var(--surface);border:1px solid var(--line);border-radius:1.1rem;box-shadow:0 16px 40px rgba(15,23,42,.16)}
.dtp-cal-head{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:.65rem}
.dtp-month{font-weight:800;font-size:.95rem;letter-spacing:-.01em}
.dtp-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:.2rem;margin-bottom:.85rem}
.dtp-dow{font-size:.68rem;font-weight:700;color:var(--muted);text-align:center;padding:.2rem 0}
.dtp-blank{min-height:2.1rem}
.dtp-day{min-height:2.1rem;border:0;border-radius:.65rem;background:transparent;color:var(--text);font:inherit;font-size:.85rem;font-weight:600;cursor:pointer}
.dtp-day:hover{background:var(--hover)}
.dtp-day.today{box-shadow:inset 0 0 0 1.5px color-mix(in srgb,var(--brand) 55%,transparent)}
.dtp-day.sel{background:var(--brand);color:#fff}
.dtp-time{display:flex;align-items:flex-end;gap:.45rem;padding:.7rem 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:.7rem}
.dtp-time-label{flex:1;font-size:.72rem;font-weight:600;color:var(--muted);display:flex;flex-direction:column;gap:.3rem}
.dtp-select{min-height:2.4rem;padding:.4rem .55rem;font-weight:600}
.dtp-time-sep{font-weight:800;color:var(--muted);padding-bottom:.55rem}
.dtp-actions{display:flex;align-items:center;gap:.4rem}
.dtp-duration{display:flex;align-items:center;gap:.65rem}
.dtp-duration .input{max-width:10rem}
.dtp-duration-auto{border-color:color-mix(in srgb,var(--brand) 45%,var(--line));background:color-mix(in srgb,var(--brand) 6%,var(--surface))}
.dtp-duration-hint{font-size:.78rem;font-weight:600;color:var(--brand);white-space:nowrap}
.dtp-duration-hint.warn{color:#b45309}.dtp-duration-hint.bad{color:var(--danger)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:639px){
  .dtp-pop{position:fixed;left:.75rem;right:.75rem;top:auto;bottom:calc(.75rem + var(--sab));width:auto;max-height:min(85vh,34rem);overflow:auto}
}

/* Live polling indicator */
.live-dot{width:.55rem;height:.55rem;border-radius:9999px;background:var(--ok);box-shadow:0 0 0 0 rgba(22,163,74,.55);animation:live-pulse 1.6s ease-out infinite;flex:none}
@keyframes live-pulse{0%{box-shadow:0 0 0 0 rgba(22,163,74,.45)}70%{box-shadow:0 0 0 .45rem rgba(22,163,74,0)}100%{box-shadow:0 0 0 0 rgba(22,163,74,0)}}

/* ---- Student home (modern dashboard) ---- */
body.student-home{--sx-blue:#4a6cf7;--sx-indigo:#5b4bdb;--sx-purple:#6d5efc;--sx-green:#22c55e;--sx-orange:#f59e0b;--sx-soft:#eef2ff}
body.student-home .page-main{max-width:42rem;padding-top:.75rem;background:linear-gradient(180deg,#e8eefc 0%,var(--bg) 280px)}
body.student-home .topbar h1{display:none}
body.student-home .topbar{background:color-mix(in srgb,#e8eefc 88%,transparent);border-bottom-color:transparent}
html.dark body.student-home .page-main{background:linear-gradient(180deg,#12182b 0%,var(--bg) 280px)}
html.dark body.student-home .topbar{background:color-mix(in srgb,#12182b 88%,transparent)}
.sx-home{display:flex;flex-direction:column;gap:1.15rem}
.sx-head{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.sx-head-user{display:flex;align-items:center;gap:.75rem;min-width:0}
.sx-avatar{width:3rem;height:3rem;border-radius:9999px;background:linear-gradient(135deg,var(--sx-blue),var(--sx-purple));color:#fff;font-weight:700;font-size:1.1rem;display:inline-flex;align-items:center;justify-content:center;flex:none;box-shadow:0 6px 16px rgba(74,108,247,.35);text-decoration:none}
.sx-greet{font-size:.8rem;color:var(--muted);margin:0;line-height:1.2}
.sx-name{font-size:1.25rem;font-weight:800;margin:0;letter-spacing:-.02em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sx-head-actions{display:flex;align-items:center;gap:.5rem;flex:none}
.sx-streak{display:inline-flex;align-items:center;gap:.35rem;padding:.35rem .7rem;border-radius:9999px;background:#fff7ed;color:#c2410c;font-weight:700;font-size:.85rem;box-shadow:0 2px 8px rgba(245,158,11,.15)}
.sx-streak-soft{background:#fff7ed;font-size:.78rem}
html.dark .sx-streak,html.dark .sx-streak-soft{background:#3b2a07;color:#fcd34d}
.sx-icon-btn{display:inline-flex;align-items:center;justify-content:center;width:2.6rem;height:2.6rem;border-radius:9999px;background:var(--surface);border:1px solid var(--line);color:var(--text);position:relative;box-shadow:0 2px 10px rgba(15,23,42,.05)}
.sx-pills{display:flex;gap:.5rem;overflow-x:auto;padding-bottom:.15rem;-webkit-overflow-scrolling:touch;scrollbar-width:none}
.sx-pills::-webkit-scrollbar{display:none}
.sx-pill{flex:none;display:inline-flex;align-items:center;gap:.3rem;padding:.45rem .9rem;border-radius:9999px;font-size:.82rem;font-weight:600;background:var(--surface);color:var(--muted);border:1px solid var(--line);text-decoration:none;box-shadow:0 2px 8px rgba(15,23,42,.04)}
.sx-pill.active{background:var(--sx-blue);color:#fff;border-color:var(--sx-blue);box-shadow:0 6px 16px rgba(74,108,247,.3)}
.sx-section{scroll-margin-top:4.5rem}
.sx-hero{position:relative;overflow:hidden;border-radius:1.35rem;padding:1.25rem 1.25rem 1.35rem;color:#fff;background:linear-gradient(145deg,#5b4bdb 0%,#6d5efc 45%,#4a6cf7 100%);box-shadow:0 14px 36px rgba(79,70,229,.32)}
.sx-hero::after{content:"";position:absolute;right:-2rem;top:-2rem;width:10rem;height:10rem;border-radius:9999px;background:rgba(255,255,255,.1);pointer-events:none}
.sx-hero-empty{background:linear-gradient(145deg,#64748b 0%,#475569 100%);box-shadow:0 14px 36px rgba(71,85,105,.28)}
.sx-hero-top{display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin-bottom:.85rem;position:relative;z-index:1}
.sx-hero-badge{display:inline-flex;align-items:center;gap:.4rem;padding:.25rem .65rem;border-radius:9999px;background:rgba(255,255,255,.18);font-size:.75rem;font-weight:600;backdrop-filter:blur(4px)}
.sx-hero-dot{width:.45rem;height:.45rem;border-radius:9999px;background:#86efac;box-shadow:0 0 0 3px rgba(134,239,172,.25)}
.sx-hero-timer{display:inline-flex;align-items:center;gap:.3rem;font-size:.78rem;font-weight:600;opacity:.95;font-variant-numeric:tabular-nums}
.sx-hero-timer.is-warn{color:#fde68a}.sx-hero-timer.is-crit{color:#fecaca;animation:pulse 1s infinite}.sx-hero-timer.is-up{color:#fecaca}
.sx-hero-title{font-size:1.35rem;font-weight:800;line-height:1.25;margin:0;position:relative;z-index:1;letter-spacing:-.02em}
.sx-hero-sub{margin:.35rem 0 0;font-size:.85rem;opacity:.85;position:relative;z-index:1}
.sx-hero-meta{display:flex;flex-wrap:wrap;gap:.65rem 1rem;margin:1rem 0 1.15rem;font-size:.8rem;opacity:.92;position:relative;z-index:1}
.sx-hero-meta span{display:inline-flex;align-items:center;gap:.3rem}
.sx-hero-cta{position:relative;z-index:1;display:inline-flex;align-items:center;justify-content:center;gap:.4rem;width:100%;min-height:3rem;padding:.7rem 1.1rem;border-radius:9999px;background:#22c55e;color:#fff;font-weight:700;font-size:.95rem;text-decoration:none;box-shadow:0 8px 20px rgba(34,197,94,.4);transition:transform .12s,filter .12s}
.sx-hero-cta:hover{filter:brightness(1.05);transform:translateY(-1px)}
.sx-quick{display:grid;grid-template-columns:repeat(4,1fr);gap:.65rem}
.sx-quick-item{display:flex;flex-direction:column;align-items:center;gap:.45rem;font-size:.72rem;font-weight:600;color:var(--text);text-decoration:none;text-align:center}
.sx-quick-ico{width:3.4rem;height:3.4rem;border-radius:9999px;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 16px rgba(15,23,42,.08)}
.sx-qi-1{background:#dbeafe;color:#1d4ed8}.sx-qi-2{background:#ede9fe;color:#6d28d9}.sx-qi-3{background:#ffedd5;color:#c2410c}.sx-qi-4{background:#dcfce7;color:#15803d}
html.dark .sx-qi-1{background:#0f2447;color:#93c5fd}html.dark .sx-qi-2{background:#2e1065;color:#c4b5fd}html.dark .sx-qi-3{background:#3b2a07;color:#fdba74}html.dark .sx-qi-4{background:#052e16;color:#86efac}
.sx-panel{background:var(--surface);border:1px solid color-mix(in srgb,var(--line) 80%,transparent);border-radius:1.25rem;padding:1.1rem 1.15rem;box-shadow:0 4px 20px rgba(15,23,42,.05)}
.sx-panel-h{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem;margin-bottom:.9rem}
.sx-panel-title{font-size:1rem;font-weight:800;margin:0;letter-spacing:-.01em}
.sx-panel-sub{font-size:.75rem;color:var(--muted);margin:.15rem 0 0}
.sx-week{display:grid;grid-template-columns:repeat(7,1fr);gap:.35rem}
.sx-week-day{display:flex;flex-direction:column;align-items:center;gap:.35rem}
.sx-week-label{font-size:.65rem;color:var(--muted);font-weight:600}
.sx-week-dot{width:2.15rem;height:2.15rem;border-radius:9999px;display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:700;background:var(--hover);color:var(--muted);border:1.5px solid transparent}
.sx-week-day.done .sx-week-dot{background:var(--sx-orange);color:#fff;box-shadow:0 4px 10px rgba(245,158,11,.35)}
.sx-week-day.today .sx-week-dot{border-color:var(--sx-blue)}
.sx-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem;text-align:center}
.sx-metrics-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:420px){.sx-metrics-4{grid-template-columns:repeat(2,1fr);gap:1rem .75rem}}
.sx-metric-val{font-size:1.45rem;font-weight:800;letter-spacing:-.02em;line-height:1.1}
.sx-metric-label{font-size:.7rem;color:var(--muted);margin-top:.25rem;font-weight:500}
.sx-hero-note{margin:.15rem 0 0;font-size:.82rem;line-height:1.45;opacity:.9;position:relative;z-index:1;max-width:36rem}
.sx-hero-gate{position:relative;z-index:1;margin-top:.85rem;padding:.75rem .9rem;border-radius:.9rem;background:rgba(15,23,42,.22);font-size:.88rem;font-weight:600;line-height:1.4}
.sx-detail-grid{display:grid;grid-template-columns:1fr;gap:.75rem}
@media(min-width:520px){.sx-detail-grid{grid-template-columns:1fr 1fr}}
.sx-detail{display:flex;align-items:flex-start;gap:.7rem;padding:.75rem;border-radius:1rem;background:var(--hover)}
.sx-detail-ico{width:2.25rem;height:2.25rem;border-radius:9999px;display:flex;align-items:center;justify-content:center;flex:none}
.sx-detail-label{font-size:.7rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.sx-detail-val{font-size:.92rem;font-weight:700;margin-top:.15rem;line-height:1.3}
.sx-instructions{font-size:.92rem;line-height:1.6;color:var(--text);white-space:pre-wrap}
.sx-policy-list .sx-todo-item{text-decoration:none;color:inherit}
.sx-policy-check{background:color-mix(in srgb,var(--sx-blue) 12%,var(--surface));border-color:transparent;color:var(--sx-blue)}
.sx-privacy{margin-top:1.1rem;padding:1rem;border-radius:1rem;background:color-mix(in srgb,var(--sx-blue) 6%,var(--surface));border:1px solid color-mix(in srgb,var(--sx-blue) 15%,var(--line))}
.sx-privacy-title{font-size:.85rem;font-weight:800;margin-bottom:.35rem}
.sx-privacy-body{font-size:.82rem;color:var(--muted);line-height:1.5;margin:0}
.sx-start-panel{display:flex;flex-direction:column;gap:.9rem}
.sx-agree{display:flex;align-items:flex-start;gap:.75rem;padding:.9rem 1rem;border-radius:1rem;background:var(--hover);cursor:pointer;font-size:.88rem;line-height:1.45}
.sx-agree input{width:1.2rem;height:1.2rem;margin-top:.15rem;flex:none;accent-color:var(--sx-blue)}
.sx-start-panel .sx-hero-cta{border:0;cursor:pointer;font:inherit}
.sx-start-panel .sx-hero-cta:disabled{opacity:.45;cursor:not-allowed;transform:none;filter:none;box-shadow:none}
.sx-cta-muted{background:#64748b;box-shadow:0 8px 20px rgba(100,116,139,.35)}
.sx-start-cancel{display:block;text-align:center;font-size:.85rem;font-weight:600;color:var(--muted);text-decoration:none}
.sx-start-cancel:hover{color:var(--sx-blue)}
.sx-start-section{padding-bottom:.5rem}
.sx-c-blue{color:var(--sx-blue)}.sx-c-green{color:var(--sx-green)}.sx-c-orange{color:var(--sx-orange)}
.sx-card-grid{display:grid;gap:.75rem}
@media(min-width:768px){.sx-card-grid{grid-template-columns:repeat(2,1fr)}}
.sx-card{background:var(--surface);border:1px solid var(--line);border-radius:1.15rem;padding:1rem 1.1rem;display:flex;flex-direction:column;gap:.75rem;box-shadow:0 4px 18px rgba(15,23,42,.05);height:100%}
.sx-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:.5rem}
.sx-card-title{font-weight:700;font-size:.95rem;line-height:1.3;word-break:break-word}
.sx-card-sub{font-size:.75rem;color:var(--muted);margin-top:.2rem}
.sx-card-meta{display:flex;flex-wrap:wrap;gap:.5rem .85rem;font-size:.78rem;color:var(--muted)}
.sx-card-meta span{display:inline-flex;align-items:center;gap:.25rem}
.sx-card-cta{margin-top:auto}
.sx-rank{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.5rem}
.sx-rank-item{display:flex;align-items:center;gap:.7rem;padding:.7rem .75rem;border-radius:1rem;background:var(--hover)}
.sx-rank-item.highlight{background:color-mix(in srgb,var(--sx-blue) 12%,var(--surface));outline:1px solid color-mix(in srgb,var(--sx-blue) 25%,transparent)}
.sx-rank-n{width:1.6rem;height:1.6rem;border-radius:9999px;background:var(--surface);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:800;color:var(--muted);flex:none}
.sx-rank-name{font-weight:650;font-size:.88rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sx-rank-meta{font-size:.72rem;color:var(--muted);margin-top:.15rem;display:flex;flex-wrap:wrap;align-items:center;gap:.35rem}
.sx-rank-pts{font-size:.78rem;font-weight:700;color:var(--sx-blue);text-align:right;flex:none;max-width:40%}
.sx-todo{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.55rem}
.sx-todo-item{display:flex;align-items:flex-start;gap:.65rem;font-size:.9rem}
.sx-todo-item a{color:inherit;text-decoration:none}.sx-todo-item a:hover{color:var(--sx-blue)}
.sx-todo-item.done{color:var(--muted);text-decoration:line-through}
.sx-todo-check{width:1.35rem;height:1.35rem;border-radius:9999px;border:2px solid var(--line);display:inline-flex;align-items:center;justify-content:center;flex:none;margin-top:.1rem;color:#fff}
.sx-todo-item.done .sx-todo-check{background:var(--sx-green);border-color:var(--sx-green)}
.sx-todo-add{display:flex;align-items:center;justify-content:center;gap:.4rem;margin-top:1rem;padding:.75rem;border:1.5px dashed var(--line);border-radius:1rem;font-size:.85rem;font-weight:600;color:var(--muted);text-decoration:none}
.sx-todo-add:hover{border-color:var(--sx-blue);color:var(--sx-blue);background:color-mix(in srgb,var(--sx-blue) 6%,transparent)}
.sx-page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem}
.sx-page-head-main{display:flex;align-items:flex-start;gap:.7rem;min-width:0}
.sx-back{display:inline-flex;align-items:center;justify-content:center;width:2.6rem;height:2.6rem;border-radius:9999px;background:var(--surface);border:1px solid var(--line);color:var(--text);flex:none;box-shadow:0 2px 10px rgba(15,23,42,.05);text-decoration:none}
.sx-back:hover{border-color:var(--sx-blue);color:var(--sx-blue)}
.sx-page-title{font-size:1.35rem;font-weight:800;margin:0;letter-spacing:-.02em;line-height:1.2}
.sx-page-sub{font-size:.8rem;color:var(--muted);margin:.2rem 0 0}
.sx-page-actions{flex:none;display:flex;align-items:center;gap:.4rem}
.sx-count-pill{display:inline-flex;align-items:center;justify-content:center;min-width:1.5rem;height:1.5rem;padding:0 .45rem;border-radius:9999px;background:color-mix(in srgb,var(--sx-blue) 12%,transparent);color:var(--sx-blue);font-size:.75rem;font-weight:800}
.sx-footnote{font-size:.8rem;color:var(--muted);margin:0}
.sx-metrics-bar{background:var(--surface);border:1px solid color-mix(in srgb,var(--line) 80%,transparent);border-radius:1.25rem;padding:1rem;box-shadow:0 4px 20px rgba(15,23,42,.05)}
.sx-list{display:flex;flex-direction:column;gap:.65rem}
.sx-list-item{display:flex;align-items:flex-start;gap:.8rem;padding:1rem 1.05rem;background:var(--surface);border:1px solid color-mix(in srgb,var(--line) 80%,transparent);border-radius:1.15rem;box-shadow:0 4px 18px rgba(15,23,42,.05);text-decoration:none;color:inherit;transition:border-color .12s,transform .12s}
a.sx-list-item:hover{border-color:color-mix(in srgb,var(--sx-blue) 40%,var(--line));transform:translateY(-1px)}
.sx-list-item.is-live{border-color:color-mix(in srgb,var(--sx-orange) 45%,var(--line));background:linear-gradient(180deg,#fff7ed,var(--surface))}
.sx-list-item.is-unread{border-color:color-mix(in srgb,var(--sx-blue) 35%,var(--line));background:color-mix(in srgb,var(--sx-blue) 6%,var(--surface))}
.sx-list-item.is-pass{border-color:color-mix(in srgb,var(--sx-green) 35%,var(--line))}
.sx-list-ico{width:2.75rem;height:2.75rem;border-radius:9999px;display:flex;align-items:center;justify-content:center;flex:none}
.sx-list-title{font-weight:700;font-size:.95rem;line-height:1.3;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.sx-list-body{font-size:.85rem;color:var(--muted);margin:.25rem 0 0;line-height:1.4}
.sx-list-meta{display:flex;flex-wrap:wrap;gap:.35rem .7rem;margin-top:.35rem;font-size:.72rem;color:var(--muted);font-weight:500}
.sx-list-side{display:flex;flex-direction:column;align-items:flex-end;gap:.45rem;flex:none}
.sx-list-cta{display:inline-flex;align-items:center;gap:.15rem;font-size:.75rem;font-weight:700;color:var(--sx-blue)}
.sx-list-actions{display:flex;align-items:center;gap:.35rem;flex:none}
.sx-score-line{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;margin-top:.45rem;font-size:.85rem}
.sx-dot-new{color:var(--sx-blue);font-weight:800}
.sx-pager{display:flex;justify-content:center}
.sx-join{background:var(--surface);border:1px solid color-mix(in srgb,var(--line) 80%,transparent);border-radius:1.35rem;padding:1.35rem 1.25rem;box-shadow:0 8px 28px rgba(15,23,42,.06)}
.sx-join-hero{text-align:center;margin-bottom:1.15rem}
.sx-join-ico{width:4rem;height:4rem;border-radius:1.25rem;margin:0 auto .85rem;display:flex;align-items:center;justify-content:center;background:linear-gradient(145deg,#5b4bdb,#4a6cf7);color:#fff;box-shadow:0 10px 24px rgba(74,108,247,.35)}
.sx-join-title{font-size:1.15rem;font-weight:800;margin:0}
.sx-join-sub{font-size:.85rem;color:var(--muted);margin:.4rem 0 0;line-height:1.45}
.sx-join-form{display:flex;flex-direction:column;gap:.85rem}
.sx-code-input{width:100%;text-align:center;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:1.55rem;font-weight:700;letter-spacing:.28em;text-transform:uppercase;padding:1rem .75rem;border:1.5px solid var(--line);border-radius:1rem;background:color-mix(in srgb,var(--sx-blue) 5%,var(--surface));color:var(--text)}
.sx-code-input:focus{outline:2px solid color-mix(in srgb,var(--sx-blue) 45%,transparent);border-color:var(--sx-blue)}
.sx-profile-banner{display:flex;align-items:center;gap:1rem;padding:1.15rem 1.2rem;border-radius:1.35rem;background:linear-gradient(145deg,#5b4bdb 0%,#6d5efc 45%,#4a6cf7 100%);color:#fff;box-shadow:0 14px 36px rgba(79,70,229,.28)}
.sx-profile-banner .sx-greet,.sx-profile-banner .sx-page-sub{color:rgba(255,255,255,.85)}
.sx-profile-banner .sx-name{color:#fff}
.sx-avatar-lg{width:4rem;height:4rem;font-size:1.45rem;box-shadow:0 8px 20px rgba(0,0,0,.18)}
@media(min-width:1024px){
  body.student-home .page-main{max-width:56rem;padding-top:1.25rem}
  body.student-home .topbar h1{display:block}
}
.pg{padding:.35rem .7rem;border:1px solid var(--line);border-radius:.5rem;font-size:.85rem;text-decoration:none;background:var(--surface);min-width:2.2rem;text-align:center}
.pg-active{background:var(--brand);color:#fff;border-color:var(--brand)}.pg-disabled{opacity:.45}
.bar{height:.6rem;border-radius:9999px;background:var(--hover);overflow:hidden}.bar>i{display:block;height:100%;background:var(--brand);border-radius:9999px}
.tabs{display:flex;gap:.25rem;overflow-x:auto;border-bottom:1px solid var(--line)}
.tab{padding:.6rem 1rem;font-size:.9rem;color:var(--muted);text-decoration:none;border-bottom:2px solid transparent;white-space:nowrap}
.tab.active{color:var(--brand);border-color:var(--brand);font-weight:600}

/* modal + toasts */
.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:1rem}.modal[hidden]{display:none}
.modal-backdrop{position:absolute;inset:0;background:rgba(15,23,42,.55)}
.modal-card{position:relative;background:var(--surface);border-radius:1rem;padding:1.4rem;width:100%;max-width:26rem;box-shadow:0 20px 50px rgba(0,0,0,.3)}
@media(max-width:639px){.modal{align-items:flex-end;padding:0}.modal-card{max-width:none;border-radius:1.25rem 1.25rem 0 0;padding-bottom:calc(1.4rem + var(--sab))}}
button.sx-pill,button.sx-quick-item{font:inherit;cursor:pointer;border:0;appearance:none;-webkit-appearance:none}
button.sx-quick-item{width:100%}
.toasts{position:fixed;z-index:110;top:calc(.75rem + var(--sat));right:.75rem;left:.75rem;display:flex;flex-direction:column;align-items:flex-end;gap:.5rem;pointer-events:none}
.toast{pointer-events:auto;display:flex;gap:.6rem;align-items:flex-start;max-width:24rem;width:100%;background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:.75rem;padding:.7rem .9rem;box-shadow:0 8px 24px rgba(15,23,42,.18);font-size:.9rem;animation:tin .2s ease-out}
.toast-success{border-left-color:var(--ok)}.toast-error{border-left-color:var(--danger)}.toast-warning{border-left-color:#d97706}
@keyframes tin{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

/* auth pages */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1.5rem 1rem;background:radial-gradient(circle at 20% 0,color-mix(in srgb,var(--brand) 18%,var(--bg)),var(--bg) 60%)}
.auth-card{width:100%;max-width:26rem;padding:1.75rem}

/* ---- Auth shell (login / register) ---- */
body.auth-page{background:#f4f6fb;font-family:"Plus Jakarta Sans",Inter,ui-sans-serif,system-ui,sans-serif}
body.auth-page main{padding:0;max-width:none}
.auth-shell{min-height:100vh;display:grid;grid-template-columns:1fr}
@media(min-width:960px){.auth-shell{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr)}}
.auth-brand{position:relative;overflow:hidden;display:none;color:#fff;padding:3rem 2.75rem;background:radial-gradient(ellipse 90% 80% at 30% 20%,#3b5bdb 0%,#1e3a8a 45%,#1e1b4b 100%)}
@media(min-width:960px){.auth-brand{display:flex;flex-direction:column;justify-content:center}}
.auth-brand-glow{position:absolute;left:20%;top:10%;width:22rem;height:22rem;border-radius:50%;background:radial-gradient(circle,rgba(96,165,250,.4) 0%,transparent 70%);pointer-events:none}
.auth-brand-inner{position:relative;z-index:1;max-width:26rem}
.auth-brand-logo{width:3.5rem;height:3.5rem;border-radius:1rem;box-shadow:0 10px 28px rgba(15,23,42,.3),0 0 0 3px rgba(255,255,255,.12);margin-bottom:1.5rem;display:block}
.auth-brand h2{margin:0;font-size:clamp(1.85rem,3vw,2.35rem);font-weight:800;letter-spacing:-.03em;line-height:1.15}
.auth-brand p{margin:.85rem 0 0;color:rgba(226,232,240,.88);font-size:1rem;line-height:1.6}
.auth-brand-points{list-style:none;margin:2rem 0 0;padding:0;display:flex;flex-direction:column;gap:.75rem}
.auth-brand-points li{display:flex;align-items:flex-start;gap:.7rem;font-size:.92rem;color:rgba(255,255,255,.92);line-height:1.45}
.auth-brand-points .ab-ico{width:2rem;height:2rem;border-radius:.6rem;background:rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center;flex:none;color:#c7d2fe}
.auth-main{display:flex;align-items:center;justify-content:center;padding:2rem 1.25rem;min-height:100vh}
.auth-panel{width:100%;max-width:26.5rem;background:#fff;border:1px solid #e8edf5;border-radius:1.35rem;padding:1.75rem 1.5rem 1.6rem;box-shadow:0 1px 2px rgba(15,23,42,.03),0 16px 40px rgba(15,23,42,.06)}
@media(min-width:480px){.auth-panel{padding:2rem 2rem 1.75rem}}
.auth-panel-head{margin-bottom:1.35rem}
.auth-panel-head .auth-mobile-brand{display:flex;align-items:center;gap:.65rem;margin-bottom:1.15rem}
@media(min-width:960px){.auth-panel-head .auth-mobile-brand{display:none}}
.auth-panel-head .auth-mobile-brand img{width:2.5rem;height:2.5rem;border-radius:.75rem}
.auth-panel-head .auth-mobile-brand span{font-weight:800;letter-spacing:-.02em;color:#0f172a}
.auth-kicker{display:inline-flex;align-items:center;gap:.35rem;padding:.22rem .65rem;border-radius:9999px;background:#eef2ff;color:#4338ca;font-size:.7rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;margin-bottom:.65rem}
.auth-panel-head h1{margin:0;font-size:1.55rem;font-weight:800;letter-spacing:-.03em;color:#0f172a;line-height:1.2}
.auth-panel-head p{margin:.45rem 0 0;font-size:.92rem;color:#64748b;line-height:1.5}
.auth-panel .space-y-4>*+*,.auth-panel .space-y-3>*+*{margin-top:0}
.auth-fields{display:flex;flex-direction:column;gap:1rem}
.auth-actions{display:flex;flex-direction:column;gap:.65rem;margin-top:1.35rem}
.auth-footer{margin-top:1.25rem;padding-top:1.1rem;border-top:1px solid #eef2f7;display:flex;flex-wrap:wrap;gap:.65rem 1rem;justify-content:space-between;align-items:center;font-size:.875rem}
.auth-footer a{color:#4f46e5;font-weight:500;text-decoration:none}
.auth-footer a:hover{text-decoration:underline}
.auth-links{display:flex;flex-wrap:wrap;gap:.75rem}

/* multi-step */
.auth-stepper{display:flex;align-items:center;gap:0;margin:0 0 1.5rem;padding:0;list-style:none}
.auth-step{flex:1;display:flex;flex-direction:column;align-items:center;gap:.4rem;position:relative;min-width:0}
.auth-step:not(:last-child)::after{content:"";position:absolute;top:.85rem;left:calc(50% + 1.1rem);right:calc(-50% + 1.1rem);height:2px;background:#e2e8f0;z-index:0}
.auth-step.is-done:not(:last-child)::after,.auth-step.is-active:not(:last-child)::after{background:#a5b4fc}
.auth-step.is-done:not(:last-child)::after{background:#6366f1}
.auth-step-dot{position:relative;z-index:1;width:1.7rem;height:1.7rem;border-radius:9999px;display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:700;background:#f1f5f9;color:#64748b;border:2px solid #e2e8f0;transition:background .15s,border-color .15s,color .15s}
.auth-step.is-active .auth-step-dot{background:#4f46e5;border-color:#4f46e5;color:#fff;box-shadow:0 0 0 4px rgba(79,70,229,.15)}
.auth-step.is-done .auth-step-dot{background:#4338ca;border-color:#4338ca;color:#fff}
.auth-step-label{font-size:.68rem;font-weight:600;color:#94a3b8;text-align:center;line-height:1.2;max-width:5.5rem}
.auth-step.is-active .auth-step-label{color:#4338ca}
.auth-step.is-done .auth-step-label{color:#475569}
.auth-step-panel[hidden]{display:none!important}
.auth-step-panel{animation:auth-step-in .28s ease-out}
@keyframes auth-step-in{from{opacity:0;transform:translateX(8px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){.auth-step-panel{animation:none}}
.auth-step-nav{display:flex;gap:.65rem;margin-top:1.35rem}
.auth-step-nav .btn{flex:1}
.auth-pw-hint{margin-top:.35rem}

/* ---- Landing (index) ---- */
body.landing{background:#fff;font-family:"Plus Jakarta Sans",Inter,ui-sans-serif,system-ui,sans-serif}
body.landing main{padding:0;max-width:none}
.lp{min-height:100vh}
.lp-hero{position:relative;overflow:hidden;color:#fff;text-align:center;padding:clamp(3rem,8vw,5.5rem) 1.25rem clamp(2.75rem,6vw,4rem);background:radial-gradient(ellipse 90% 80% at 50% 15%,#3b5bdb 0%,#1e3a8a 42%,#1e1b4b 100%)}
.lp-hero-glow{position:absolute;left:50%;top:18%;width:min(28rem,80vw);height:min(28rem,80vw);transform:translate(-50%,-40%);border-radius:50%;background:radial-gradient(circle,rgba(96,165,250,.45) 0%,rgba(59,130,246,.12) 45%,transparent 70%);pointer-events:none}
.lp-hero-inner{position:relative;z-index:1;max-width:42rem;margin:0 auto}
.lp-logo{width:4.5rem;height:4.5rem;border-radius:1.15rem;box-shadow:0 12px 40px rgba(15,23,42,.35),0 0 0 4px rgba(255,255,255,.12);margin:0 auto 1.25rem;display:block;background:#3b82f6}
.lp-brand{font-size:clamp(2.4rem,6vw,3.5rem);font-weight:800;letter-spacing:-.03em;line-height:1.1;margin:0}
.lp-subtitle{margin:.65rem 0 0;font-size:clamp(1.15rem,2.6vw,1.55rem);font-weight:700;color:#a5b4fc;letter-spacing:-.02em}
.lp-tagline{margin:1rem auto 0;max-width:28rem;font-size:1rem;font-weight:400;color:rgba(226,232,240,.88);line-height:1.55}
.lp-pills{display:flex;flex-wrap:wrap;justify-content:center;gap:.55rem;margin:1.6rem 0 0}
.lp-pill{display:inline-flex;align-items:center;padding:.4rem .95rem;border-radius:.75rem;border:1px solid rgba(255,255,255,.35);font-size:.82rem;font-weight:500;color:rgba(255,255,255,.92);background:rgba(255,255,255,.06);backdrop-filter:blur(6px)}
.lp-cta{display:flex;flex-wrap:wrap;justify-content:center;gap:.65rem;margin:1.85rem 0 0}
.lp-cta-primary{min-width:8.5rem;background:#fff;color:#1e3a8a;border:0;font-weight:600;box-shadow:0 8px 24px rgba(15,23,42,.2)}
.lp-cta-primary:hover:not(:disabled){background:#eef2ff;color:#1e3a8a}
.lp-cta-ghost{background:transparent;border:1px solid rgba(255,255,255,.4);color:#fff;font-weight:500}
.lp-cta-ghost:hover{background:rgba(255,255,255,.1)}
.lp-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin:2.25rem auto 0;max-width:32rem;padding:0}
.lp-meta dt{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:rgba(165,180,252,.85);font-weight:600;margin:0 0 .2rem}
.lp-meta dd{margin:0;font-size:.82rem;font-weight:500;color:rgba(255,255,255,.92)}
@media(max-width:520px){.lp-meta{grid-template-columns:1fr;gap:.85rem}.lp-meta>div{padding:.35rem 0;border-top:1px solid rgba(255,255,255,.12)}.lp-meta>div:first-child{border-top:0}}
.lp-challenge{background:#fff;padding:clamp(2.75rem,6vw,4.5rem) 1.25rem 3.5rem}
.lp-challenge-inner{max-width:56rem;margin:0 auto}
.lp-badge{display:inline-flex;align-items:center;gap:.35rem;padding:.28rem .7rem;border-radius:9999px;background:#fee2e2;color:#b91c1c;font-size:.72rem;font-weight:700;letter-spacing:.02em}
.lp-h2{margin:.85rem 0 0;font-size:clamp(1.85rem,4vw,2.5rem);font-weight:800;letter-spacing:-.03em;color:#0f172a;line-height:1.15}
.lp-lead{margin:1rem 0 0;max-width:40rem;font-size:1.02rem;line-height:1.65;color:#64748b}
.lp-grid{display:grid;grid-template-columns:1fr;gap:1rem;margin:2rem 0 0}
@media(min-width:640px){.lp-grid{grid-template-columns:1fr 1fr}}
.lp-card{background:#fff;border:1px solid #e8edf5;border-radius:1rem;padding:1.25rem 1.2rem;box-shadow:0 1px 2px rgba(15,23,42,.03),0 8px 24px rgba(15,23,42,.04);transition:transform .18s ease,box-shadow .18s ease}
.lp-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(15,23,42,.06),0 16px 32px rgba(15,23,42,.06)}
.lp-card-icon{width:2.4rem;height:2.4rem;border-radius:.7rem;background:#fee2e2;color:#ef4444;display:flex;align-items:center;justify-content:center;margin-bottom:.85rem}
.lp-card h3{margin:0;font-size:1.05rem;font-weight:700;color:#0f172a;letter-spacing:-.02em}
.lp-card p{margin:.45rem 0 0;font-size:.9rem;line-height:1.55;color:#64748b}
.lp-stats{display:grid;grid-template-columns:1fr;gap:.85rem;margin:2rem 0 0}
@media(min-width:640px){.lp-stats{grid-template-columns:repeat(3,1fr)}}
.lp-stat{background:#fff5f0;border:1px solid #ffe4d6;border-radius:1rem;padding:1.25rem 1.1rem;text-align:left}
.lp-stat-icon{width:2.25rem;height:2.25rem;border-radius:.65rem;background:rgba(251,146,60,.18);color:#ea580c;display:flex;align-items:center;justify-content:center;margin-bottom:.7rem}
.lp-stat-value{font-size:1.45rem;font-weight:800;letter-spacing:-.03em;color:#0f172a;line-height:1.15}
.lp-stat-label{margin-top:.25rem;font-size:.85rem;color:#78716c;font-weight:500}
@keyframes lp-fade-up{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.lp-logo,.lp-brand,.lp-subtitle,.lp-tagline,.lp-pills,.lp-cta,.lp-meta{animation:lp-fade-up .55s ease-out both}
.lp-brand{animation-delay:.05s}.lp-subtitle{animation-delay:.12s}.lp-tagline{animation-delay:.18s}.lp-pills{animation-delay:.24s}.lp-cta{animation-delay:.3s}.lp-meta{animation-delay:.36s}
.lp-card,.lp-stat{animation:lp-fade-up .5s ease-out both}
.lp-card:nth-child(1){animation-delay:.05s}.lp-card:nth-child(2){animation-delay:.1s}.lp-card:nth-child(3){animation-delay:.15s}.lp-card:nth-child(4){animation-delay:.2s}
.lp-stat:nth-child(1){animation-delay:.1s}.lp-stat:nth-child(2){animation-delay:.16s}.lp-stat:nth-child(3){animation-delay:.22s}
@media(prefers-reduced-motion:reduce){.lp-logo,.lp-brand,.lp-subtitle,.lp-tagline,.lp-pills,.lp-cta,.lp-meta,.lp-card,.lp-stat{animation:none}.lp-card:hover{transform:none}}
.spinner{width:1rem;height:1rem;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;display:inline-block;animation:sp .7s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}

/* ---- Exam interface ---- */
body.bare{background:var(--bg)}
body.exam-modern{--exam-blue:#4a6cf7;background:linear-gradient(180deg,#e8eefc 0%,var(--bg) 40%)}
html.dark body.exam-modern{background:linear-gradient(180deg,#12182b 0%,var(--bg) 40%)}
.exam-top{position:sticky;top:0;z-index:45;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid color-mix(in srgb,var(--line) 70%,transparent);padding:calc(.65rem + var(--sat)) calc(1rem + var(--sar)) .65rem calc(1rem + var(--sal));display:flex;align-items:center;gap:.75rem;justify-content:space-between}
.exam-back{display:inline-flex;align-items:center;justify-content:center;width:2.6rem;height:2.6rem;border-radius:9999px;background:var(--surface);border:1px solid var(--line);color:var(--text);flex:none;text-decoration:none;box-shadow:0 2px 10px rgba(15,23,42,.06)}
.exam-back:hover{border-color:var(--exam-blue,#4a6cf7);color:var(--exam-blue,#4a6cf7);background:color-mix(in srgb,var(--exam-blue,#4a6cf7) 8%,var(--surface))}
.exam-top-main{flex:1;min-width:0}
.exam-kicker{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--exam-blue,#4a6cf7);margin-bottom:.1rem}
.exam-timer{font-variant-numeric:tabular-nums;font-weight:800;font-size:1.05rem;padding:.4rem .85rem;border-radius:9999px;background:#fff;border:1px solid var(--line);box-shadow:0 4px 14px rgba(15,23,42,.06);color:var(--text)}
html.dark .exam-timer{background:var(--surface)}
.exam-timer.warn{background:#fef3c7;color:#92400e;border-color:#fde68a}.exam-timer.crit{background:#fee2e2;color:#991b1b;border-color:#fecaca;animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.6}}
.exam-layout{display:grid;gap:1rem;max-width:72rem;margin:0 auto;padding:1rem calc(1rem + var(--sar)) calc(6.75rem + var(--sab)) calc(1rem + var(--sal))}
@media(min-width:1024px){.exam-layout{grid-template-columns:1fr 18rem;padding-bottom:6rem}}
.exam-surface{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.exam-surface input,.exam-surface textarea{-webkit-user-select:text;user-select:text}
.exam-qcard,.exam-palette-card{background:var(--surface);border:1px solid color-mix(in srgb,var(--line) 75%,transparent);border-radius:1.35rem;padding:1.25rem 1.2rem;box-shadow:0 8px 28px rgba(15,23,42,.06)}
.exam-q-meta{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:1rem}
.exam-q-badge{display:inline-flex;align-items:center;padding:.25rem .7rem;border-radius:9999px;font-size:.75rem;font-weight:700;background:color-mix(in srgb,var(--exam-blue,#4a6cf7) 12%,transparent);color:var(--exam-blue,#4a6cf7)}
.exam-q-points{font-size:.75rem;color:var(--muted);font-weight:600}
.q-text{word-break:break-word;font-size:1.1rem;line-height:1.45;color:var(--text)}
.q-text-rich{display:flex;flex-direction:column;gap:.85rem}
.q-prose{white-space:pre-wrap;font-weight:700;line-height:1.45}
.q-img{max-width:100%;max-height:22rem;border-radius:1rem;border:1px solid var(--line);margin-top:.85rem;-webkit-user-drag:none;pointer-events:none}

/* IDE-style code panel (visual only) */
.exam-code{border-radius:1rem;overflow:hidden;background:#282c34;border:1px solid #1f2329;box-shadow:0 10px 28px rgba(15,23,42,.22);text-align:left}
.exam-code-bar{display:flex;align-items:center;justify-content:space-between;gap:.75rem;padding:.65rem 1rem;background:#21252b;border-bottom:1px solid rgba(255,255,255,.06)}
.exam-code-lang{display:inline-flex;align-items:center;gap:.45rem;color:#e5e7eb;font-size:.8rem;font-weight:700;letter-spacing:.01em}
.exam-code-brackets{display:inline-flex;align-items:center;justify-content:center;min-width:1.6rem;height:1.35rem;padding:0 .3rem;border-radius:.4rem;background:rgba(99,102,241,.25);color:#c7d2fe;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.72rem;font-weight:800}
.exam-code-pre{margin:0;padding:1rem 1.1rem;overflow:auto;max-height:min(50vh,22rem);background:#282c34;-webkit-user-select:none;user-select:none}
.exam-code-pre code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;font-size:.88rem;line-height:1.55;font-weight:500;tab-size:4;background:transparent!important;padding:0!important;color:#abb2bf}
.exam-code .hljs{background:transparent;padding:0;color:#abb2bf}
.exam-qcard .exam-code{-webkit-user-select:none;user-select:none}
.exam-answers{margin-top:1.25rem}
.choices-grid{display:grid;grid-template-columns:1fr;gap:.65rem}
@media(min-width:480px){.choices-grid{grid-template-columns:1fr 1fr}}
.choice{display:flex;align-items:flex-start;gap:.7rem;padding:.9rem 1rem;border:1.5px solid var(--line);border-radius:1rem;cursor:pointer;min-height:3.4rem;background:color-mix(in srgb,var(--hover) 55%,var(--surface));transition:border-color .12s,background .12s,box-shadow .12s}
.choice:hover{background:var(--hover);border-color:color-mix(in srgb,var(--exam-blue,#4a6cf7) 35%,var(--line))}
.choice input{position:absolute;opacity:0;pointer-events:none}
.choice-letter{flex:none;width:1.75rem;height:1.75rem;border-radius:.55rem;display:inline-flex;align-items:center;justify-content:center;font-size:.78rem;font-weight:800;background:var(--surface);color:var(--muted);border:1px solid var(--line)}
.choice-text{flex:1;font-size:.92rem;font-weight:550;line-height:1.4;padding-top:.15rem}
.choice.sel{border-color:var(--exam-blue,#4a6cf7);background:color-mix(in srgb,var(--exam-blue,#4a6cf7) 10%,var(--surface));box-shadow:0 4px 14px rgba(74,108,247,.15)}
.choice.sel .choice-letter{background:var(--exam-blue,#4a6cf7);color:#fff;border-color:var(--exam-blue,#4a6cf7)}
.palette{display:grid;grid-template-columns:repeat(auto-fill,minmax(2.6rem,1fr));gap:.4rem}
.pbtn{height:2.6rem;border-radius:.75rem;border:1.5px solid var(--line);background:var(--surface);color:var(--text);font-weight:600;font-size:.85rem;cursor:pointer;position:relative}
.pbtn.answered{background:color-mix(in srgb,var(--ok) 18%,var(--surface));border-color:var(--ok)}
.pbtn.flagged::after{content:"";position:absolute;top:2px;right:2px;border:5px solid transparent;border-top-color:#d97706;border-right-color:#d97706}
.pbtn.current{outline:2px solid var(--exam-blue,#4a6cf7);outline-offset:1px;background:var(--exam-blue,#4a6cf7);color:#fff;border-color:var(--exam-blue,#4a6cf7)}
.exam-bar{position:fixed;left:0;right:0;bottom:0;z-index:45;background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:blur(10px);border-top:1px solid var(--line);padding:.65rem calc(1rem + var(--sar)) calc(.65rem + var(--sab)) calc(1rem + var(--sal));display:flex;gap:.45rem;align-items:center;justify-content:space-between;box-shadow:0 -8px 24px rgba(15,23,42,.06)}
.exam-bar-btn{border-radius:.85rem}
.exam-submit{border-radius:9999px;padding-left:1.1rem;padding-right:1.1rem;box-shadow:0 6px 16px rgba(79,70,229,.3)}
.exam-overlay-card{border-radius:1.35rem;box-shadow:0 16px 40px rgba(15,23,42,.15)}
#watermark{position:fixed;inset:0;z-index:50;pointer-events:none;background-repeat:repeat}
#palette-panel{display:none}
@media(min-width:1024px){#palette-panel{display:block}#palette-toggle{display:none}}
#palette-panel.open{display:block;position:fixed;inset:auto 0 calc(4.5rem + var(--sab)) 0;z-index:46;margin:.5rem;max-height:50vh;overflow:auto}
.fs-overlay{position:fixed;inset:0;z-index:70;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;padding:1rem;text-align:center}
.fs-overlay[hidden]{display:none}
body.exam-fs-locked .exam-layout,
body.exam-fs-locked .exam-bar,
body.exam-fs-locked .exam-top{pointer-events:none;user-select:none;filter:blur(1.5px)}
body.exam-fs-locked .fs-overlay{pointer-events:auto;filter:none;user-select:auto}
@media print{body.exam-page *{display:none!important}body.exam-page::before{content:"Printing is disabled during an examination.";display:block}}