/* Layout: a calm green-and-sand exam desk; one strong hero band, then plain working surfaces. */
:root{
  --bg:#F5F6F2; --surface:#FFFFFF; --soft:#E9EFEA; --ink:#14221E; --muted:#56665F; --line:#D6DED8;
  --brand:#1D4F47; --brand-2:#2C6B60; --brand-ink:#FFFFFF; --accent:#B97A22; --accent-soft:#F6E9D3;
  --ok:#25744A; --ok-soft:#E1F1E7; --warn:#9A5B00; --warn-soft:#FBEBD0; --danger:#B3261E; --danger-soft:#FBE4E1;
  --hero-line:rgba(255,255,255,.14);
  --f-display:"Readex Pro","IBM Plex Sans Arabic",system-ui,sans-serif;
  --f-body:"IBM Plex Sans Arabic",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;
  --r:10px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0E1614; --surface:#15201D; --soft:#1B2A26; --ink:#E5EDE9; --muted:#9BB0A7; --line:#2A3A35;
  --brand:#5DB0A0; --brand-2:#4A988A; --brand-ink:#08130F; --accent:#E2A452; --accent-soft:#3A2C17;
  --ok:#6CCB94; --ok-soft:#173326; --warn:#E8B45C; --warn-soft:#3A2B12; --danger:#F08A80; --danger-soft:#3B1916;
  --hero-line:rgba(8,19,15,.18); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0E1614; --surface:#15201D; --soft:#1B2A26; --ink:#E5EDE9; --muted:#9BB0A7; --line:#2A3A35;
  --brand:#5DB0A0; --brand-2:#4A988A; --brand-ink:#08130F; --accent:#E2A452; --accent-soft:#3A2C17;
  --ok:#6CCB94; --ok-soft:#173326; --warn:#E8B45C; --warn-soft:#3A2B12; --danger:#F08A80; --danger-soft:#3B1916;
  --hero-line:rgba(8,19,15,.18); color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.6}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--surface)}
h1,h2,h3{font-family:var(--f-display);line-height:1.2;text-wrap:balance;margin:0}
p{margin:0}
.wrap{max-width:1080px;margin-inline:auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:9px 16px;cursor:pointer;font-weight:500;min-height:42px;text-decoration:none;color:var(--ink)}
.btn:hover{background:var(--soft)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:var(--brand-ink)}
.btn.primary:hover{background:var(--brand-2)}
.btn.accent{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.danger{color:var(--danger);border-color:var(--danger)}
.btn.ghost{border-color:transparent;background:transparent}
.btn.sm{min-height:34px;padding:5px 12px;font-size:14px}
.btn:disabled{opacity:.55;cursor:not-allowed}
label.f{display:grid;gap:6px;font-size:14px;font-weight:500;color:var(--muted)}
input.in,select.in,textarea.in{width:100%;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:10px 12px;color:var(--ink);font-size:16px}
textarea.in{min-height:90px;resize:vertical}
input.in:focus,select.in:focus,textarea.in:focus{border-color:var(--brand);outline:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 25%,transparent)}
.mono{font-family:var(--f-mono);letter-spacing:.04em}
.muted{color:var(--muted)}
.err{color:var(--danger);font-size:14px;min-height:1.4em}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;letter-spacing:.03em;padding:2px 10px;border-radius:99px;background:var(--soft);color:var(--muted);white-space:nowrap}
.pill.ok{background:var(--ok-soft);color:var(--ok)}
.pill.warn{background:var(--warn-soft);color:var(--warn)}
.pill.danger{background:var(--danger-soft);color:var(--danger)}
.pill.brand{background:var(--accent-soft);color:var(--accent)}

/* header */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--surface);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:12px;min-height:64px;flex-wrap:wrap;padding-block:8px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);margin-inline-end:auto;min-width:0}
.brand svg{flex:none}
.brand b{font-family:var(--f-display);font-size:17px;display:block;line-height:1.2}
.brand small{display:block;color:var(--muted);font-size:12px;line-height:1.3}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{padding:6px 12px;border-radius:8px;color:var(--muted);text-decoration:none;font-weight:500}
.nav a[aria-current="page"]{background:var(--soft);color:var(--ink)}
body.examMode .nav{display:none}

/* hero */
.hero{background:var(--brand);color:var(--brand-ink);position:relative;overflow:hidden}
.hero svg.ridge{position:absolute;inset:auto 0 0 0;width:100%;height:180px;pointer-events:none}
.hero .wrap{position:relative;padding-block:56px 72px;display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;opacity:.85}
[dir="rtl"] .eyebrow{letter-spacing:0}
.hero h1{font-size:clamp(32px,5vw,52px);margin-block:10px 14px}
.hero p.lead{font-size:18px;opacity:.9;max-width:34ch}
.codecard{background:var(--surface);color:var(--ink);border-radius:14px;padding:24px;display:grid;gap:14px;box-shadow:0 18px 40px -20px rgba(0,0,0,.45)}
.codecard h2{font-size:20px}
.codein{font-family:var(--f-mono);font-size:24px;letter-spacing:.12em;text-transform:uppercase;text-align:center}
.hint{font-size:13px;color:var(--muted)}
.demo{font-size:13px;background:var(--accent-soft);color:var(--ink);border-radius:8px;padding:8px 12px}
.demo code{font-family:var(--f-mono);font-weight:600}

.sec{padding-block:56px}
.sec h2{font-size:28px;margin-bottom:8px}
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:28px;counter-reset:s}
.step{border-top:3px solid var(--brand);padding-top:16px;display:grid;gap:6px}
.step .n{font-family:var(--f-mono);color:var(--accent);font-weight:600}
.step h3{font-size:18px}
.teach{background:var(--soft)}
.feat{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:24px}
.feat div{display:grid;gap:4px}
.feat h3{font-size:17px}
.cta{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:32px;padding-top:24px;border-top:1px solid var(--line)}
footer{padding-block:24px;color:var(--muted);font-size:13px;border-top:1px solid var(--line)}

/* panels */
.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;display:grid;gap:16px}
.narrow{max-width:520px;margin-inline:auto}
.center{padding-block:48px}
.meta{display:flex;flex-wrap:wrap;gap:8px}
.rules{display:grid;gap:10px;padding:0;margin:0;list-style:none}
.rules li{display:flex;gap:10px}
.rules li::before{content:"";flex:none;width:8px;height:8px;border-radius:50%;background:var(--accent);margin-top:9px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}

/* exam */
.examBar{position:sticky;top:env(safe-area-inset-top,0px);z-index:15;background:var(--surface);border-bottom:1px solid var(--line)}
.examBar .wrap{display:flex;gap:16px;align-items:center;min-height:64px;flex-wrap:wrap;padding-block:8px}
.examBar .t{margin-inline-end:auto;min-width:0}
.examBar .t b{font-family:var(--f-display);display:block}
.timer{font-family:var(--f-mono);font-size:22px;font-weight:600;font-variant-numeric:tabular-nums;padding:4px 12px;border-radius:8px;background:var(--soft)}
.timer.low{background:var(--danger-soft);color:var(--danger)}
.saved{font-size:13px;color:var(--muted)}
.examBody{display:grid;grid-template-columns:220px minmax(0,1fr);gap:24px;padding-block:24px 48px}
.qnav{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;align-content:start;position:sticky;top:96px}
.qnav h3{grid-column:1/-1;font-size:14px;color:var(--muted);font-family:var(--f-body);font-weight:600}
.qnav button{aspect-ratio:1;border:1px solid var(--line);background:var(--surface);border-radius:8px;cursor:pointer;font-family:var(--f-mono);font-weight:600;font-size:14px}
.qnav button.done{background:var(--soft);border-color:var(--brand)}
.qnav button.cur{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}
.qnav .legend{grid-column:1/-1;font-size:12px;color:var(--muted);margin-top:6px}
.qcard{display:grid;gap:18px}
.qhead{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}
.qtext{font-size:20px;font-weight:500;line-height:1.5}
.opts{display:grid;gap:10px}
.opt{display:flex;gap:12px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:12px 14px;cursor:pointer;background:var(--surface)}
.opt:hover{background:var(--soft)}
.opt input{width:20px;height:20px;accent-color:var(--brand);flex:none}
.opt:has(input:checked){border-color:var(--brand);background:var(--soft)}
.opt .k{font-family:var(--f-mono);font-weight:600;color:var(--muted)}
.wc{font-size:13px;color:var(--muted)}
.qfoot{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.confirm{border:1px solid var(--accent);background:var(--accent-soft);border-radius:12px;padding:16px;display:grid;gap:12px}

/* lock */
.lock{position:fixed;inset:0;z-index:50;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(6px);display:grid;place-items:center;padding:24px max(16px,env(safe-area-inset-right,0px)) 24px max(16px,env(safe-area-inset-left,0px))}
.lock .panel{max-width:440px;width:100%;border-color:var(--danger)}
.lock h2{color:var(--danger);font-size:22px}

/* teacher */
.tbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;padding-block:24px 8px}
.tbar h1{font-size:26px;margin-inline-end:auto}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:20px;overflow-x:auto}
.tabs button{border:0;background:none;padding:10px 14px;cursor:pointer;color:var(--muted);font-weight:500;border-bottom:3px solid transparent;white-space:nowrap}
.tabs button[aria-selected="true"]{color:var(--ink);border-color:var(--accent)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.ecard{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;display:grid;gap:10px}
.ecard h3{font-size:18px}
.ecard .code{font-family:var(--f-mono);font-size:18px;font-weight:600;color:var(--brand)}
.ecard .acts{display:flex;gap:8px;flex-wrap:wrap;margin-top:4px}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{text-align:start;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:middle}
th{font-size:12px;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);font-weight:600;background:var(--soft)}
tr:last-child td{border-bottom:0}
td.num{font-variant-numeric:tabular-nums;font-family:var(--f-mono)}
tr.click{cursor:pointer}
tr.click:hover td{background:var(--soft)}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:16px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px}
.stat b{display:block;font-family:var(--f-display);font-size:26px;font-variant-numeric:tabular-nums}
.stat span{font-size:13px;color:var(--muted)}
.qedit{border:1px solid var(--line);border-radius:12px;padding:16px;display:grid;gap:12px;background:var(--surface)}
.qedit .opts2{display:grid;gap:8px}
.qedit .optrow{display:flex;gap:8px;align-items:center}
.qedit .optrow input[type=radio]{width:20px;height:20px;accent-color:var(--ok);flex:none}
.ans{border:1px solid var(--line);border-radius:12px;padding:14px;display:grid;gap:8px}
.ans .student{white-space:pre-wrap;background:var(--soft);border-radius:8px;padding:10px 12px}
.ans .fb{font-size:14px;color:var(--muted)}
.ans input.score{width:90px}
.toast{position:fixed;inset-inline-start:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 18px;border-radius:10px;z-index:60;font-size:14px;max-width:calc(100vw - 32px)}
[dir="rtl"] .toast{transform:translateX(50%)}
.empty{border:1px dashed var(--line);border-radius:12px;padding:28px;text-align:center;color:var(--muted)}

@media (max-width:820px){
  .hero .wrap{grid-template-columns:1fr;padding-block:36px 56px}
  .steps,.feat{grid-template-columns:1fr}
  .examBody{grid-template-columns:1fr}
  .qnav{position:static;grid-template-columns:repeat(8,1fr)}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid2,.grid3{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* hosted version additions */
.setupmsg{max-width:640px;margin:48px auto;display:grid;gap:12px}
.slips{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:10px}
.slip{border:1px dashed var(--line);border-radius:10px;padding:12px;display:grid;gap:2px;background:var(--surface)}
.slip b{font-family:var(--f-display)}
.slip .mono{font-size:18px;font-weight:600;color:var(--brand)}
.livehead{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:16px}
.livehead h2{font-size:22px;margin-inline-end:auto}
tr.locked td{background:var(--danger-soft)}
.inline-confirm{display:inline-flex;gap:8px;align-items:center;flex-wrap:wrap}
.filebtn{position:relative;overflow:hidden}
.filebtn input{position:absolute;inset:0;opacity:0;cursor:pointer}
.offline{color:var(--warn);font-weight:600}
.note{font-size:14px;color:var(--muted)}
.sharebar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--surface);margin-bottom:16px}
@media print{body *{visibility:hidden}.slips,.slips *{visibility:visible}.slips{position:absolute;inset:0;grid-template-columns:repeat(3,1fr)}.slip{break-inside:avoid;border:1px dashed #999}}

/* school motto band: kept light in both themes so the maroon lettering stays readable */
.motto{background:#FFFFFF;border-bottom:1px solid var(--line);display:flex;justify-content:center;padding-block:12px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.motto img{width:min(340px,100%);height:auto;display:block}