:root{--ink:#14232f;--muted:#5b6b78;--teal:#0f3d4c;--teal2:#145466;--mint:#9fd3d6;--bg:#f4f7f8;--card:#fff;--line:#dbe5e8;--acc:#e4572e;--ok:#1a8f5a;--okbg:#e7f6ee;--bad:#c2372b;--badbg:#fdecea;--warnbg:#fff6e5;--r:14px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55;font-size:16px}
.ar,[dir=rtl]{font-family:"Noto Naskh Arabic","Geeza Pro","Segoe UI","Noto Sans Arabic",Tahoma,sans-serif}
a{color:var(--teal2)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,.opt:focus-visible{outline:3px solid var(--acc);outline-offset:2px}
.wrap{max-width:860px;margin:0 auto;padding:0 18px}
header.top{background:var(--teal);color:#fff}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:58px}
.brand{font-weight:800;letter-spacing:.2px;color:#fff;text-decoration:none;font-size:17px}
.brand span{color:var(--mint);font-weight:600}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:12px 18px;font:inherit;font-weight:700;cursor:pointer;text-decoration:none;background:var(--acc);color:#fff;min-height:46px}
.btn.secondary{background:#fff;color:var(--teal);border:1.5px solid var(--line)}
.btn.ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.4);padding:8px 14px;min-height:38px;font-size:14px}
.btn.small{padding:8px 12px;min-height:36px;font-size:14px;border-radius:10px}
.btn.dark{background:var(--teal)}
.btn:disabled{opacity:.5;cursor:default}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:0 1px 2px rgba(16,40,50,.04)}
.muted{color:var(--muted)}
.small{font-size:14px}
h1,h2,h3{line-height:1.25;margin:0 0 10px}
/* landing */
.hero{background:linear-gradient(160deg,var(--teal) 0%,#0b2f3b 100%);color:#fff;padding:40px 0 46px}
.kicker{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--mint);font-weight:700}
.hero h1{font-size:30px;margin:12px 0 6px}
.hero h1.ar{font-size:26px;margin-top:4px;color:#e8f3f4;font-weight:700}
.hero p{color:#d5e8ea;max-width:620px}
.badges{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 22px}
.badge{border:1px solid rgba(159,211,214,.6);color:#e6f4f5;border-radius:999px;padding:5px 12px;font-size:13px;font-weight:600}
.cta{display:flex;flex-wrap:wrap;gap:10px}
section.block{padding:30px 0}
section.block h2{font-size:22px}
.grid{display:grid;gap:12px}
@media(min-width:640px){.grid.two{grid-template-columns:1fr 1fr}.grid.three{grid-template-columns:repeat(3,1fr)}}
.sectionlist{list-style:none;margin:0;padding:0}
.sectionlist li{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}
.sectionlist li:last-child{border-bottom:0}
.count{background:var(--bg);border-radius:999px;padding:2px 10px;font-weight:700;font-size:14px;color:var(--teal)}
.price{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.price .now{font-size:38px;font-weight:800;color:var(--teal)}
.price .was{font-size:20px;color:var(--muted);text-decoration:line-through}
.steps{counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{position:relative;padding:10px 0 10px 44px}
.steps li:before{counter-increment:s;content:counter(s);position:absolute;left:0;top:8px;width:30px;height:30px;border-radius:50%;background:var(--teal);color:#fff;display:grid;place-items:center;font-weight:800}
.ph{background:var(--warnbg);border:1px dashed #d9a441;border-radius:6px;padding:1px 6px;font-weight:700;color:#7a4e00}
footer{padding:26px 0 40px;color:var(--muted);font-size:13px}
/* question */
.qcard{position:relative}
.qmeta{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.pill{display:inline-block;background:#e9f3f4;color:var(--teal);border-radius:999px;padding:3px 10px;font-size:13px;font-weight:700}
.qtitle{font-size:14px;color:var(--muted);font-weight:600}
.stem{font-size:17px;margin:6px 0 14px;white-space:pre-line}
.opts{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.opt{display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;font:inherit;color:inherit;cursor:pointer;min-height:52px}
.opt .let{flex:0 0 30px;height:30px;border-radius:50%;background:var(--bg);display:grid;place-items:center;font-weight:800;color:var(--teal)}
.opt:hover:not(:disabled){border-color:var(--teal2)}
.opt.sel{border-color:var(--teal);background:#eef6f7}
.opt.right{border-color:var(--ok);background:var(--okbg)}
.opt.right .let{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--badbg)}
.opt.wrong .let{background:var(--bad);color:#fff}
.opt:disabled{cursor:default}
.verdict{margin:16px 0 10px;padding:12px 14px;border-radius:12px;font-weight:800}
.verdict.ok{background:var(--okbg);color:var(--ok)}
.verdict.no{background:var(--badbg);color:var(--bad)}
.exp{border-top:1px solid var(--line);margin-top:12px;padding-top:12px}
.exp h4{margin:12px 0 4px;font-size:13px;letter-spacing:.6px;text-transform:uppercase;color:var(--teal2)}
.exp [dir=rtl] h4{letter-spacing:0}
.exp p{margin:0 0 8px}
.tip{background:#fff6ef;border-inline-start:4px solid var(--acc);border-radius:8px;padding:9px 12px;margin:8px 0}
.calc{direction:ltr;text-align:left;white-space:pre-line;background:#f3f9fa;border:1px solid #cfe3e4;border-radius:8px;padding:9px 12px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px;color:var(--teal)}
.guide{font-size:13px;color:var(--muted);margin-top:8px}
.note{color:#7c2d12;font-size:15px}
.rtl{direction:rtl;text-align:right;unicode-bidi:plaintext}
.rtl p,.rtl .tip{unicode-bidi:plaintext}
.seg{display:inline-flex;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:3px}
.seg button{border:0;background:transparent;font:inherit;font-size:14px;font-weight:700;padding:6px 12px;border-radius:8px;color:var(--muted);cursor:pointer;min-height:34px}
.seg button.on{background:#fff;color:var(--teal);box-shadow:0 1px 2px rgba(0,0,0,.08)}
.bar{height:8px;background:#e6eef0;border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--teal2)}
.navrow{display:flex;justify-content:space-between;gap:10px;margin-top:16px;flex-wrap:wrap}
.secrow{display:flex;align-items:center;gap:12px;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--line);cursor:pointer}
.secrow:last-child{border-bottom:0}
.secrow .nm{font-weight:700}
.secrow .ar{font-size:14px;color:var(--muted)}
.stat{font-weight:800;color:var(--teal);white-space:nowrap;font-size:14px}
.field{display:grid;gap:6px;margin-bottom:12px}
.field label{font-weight:700;font-size:14px}
input,select,textarea{font:inherit;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;background:#fff;width:100%;min-height:46px}
.alert{border-radius:10px;padding:12px 14px;margin:10px 0;font-weight:600}
.alert.bad{background:var(--badbg);color:var(--bad)}
.alert.good{background:var(--okbg);color:var(--ok)}
.hide{display:none!important}
.grid-q{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px}
.grid-q button{border:1.5px solid var(--line);background:#fff;border-radius:8px;min-height:38px;font:inherit;font-weight:700;cursor:pointer}
.grid-q button.ans{background:#eef6f7;border-color:var(--teal2)}
.grid-q button.cur{outline:2px solid var(--acc)}
.grid-q button.r{background:var(--okbg);border-color:var(--ok)}
.grid-q button.w{background:var(--badbg);border-color:var(--bad)}
.timer{font-variant-numeric:tabular-nums;font-weight:800}
/* deterrents */
.protect{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
#wm{position:fixed;inset:0;pointer-events:none;z-index:50;overflow:hidden;opacity:.055}
#wm div{position:absolute;white-space:nowrap;font-weight:700;font-size:15px;color:#0f3d4c;transform:rotate(-28deg)}
@media print{body.protect *{display:none!important}}
table.users{width:100%;border-collapse:collapse;font-size:14px}
table.users th,table.users td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--line);vertical-align:top}
.tag{display:inline-block;font-size:12px;font-weight:700;border-radius:6px;padding:2px 7px;background:var(--bg)}
.tag.red{background:var(--badbg);color:var(--bad)}
.tag.green{background:var(--okbg);color:var(--ok)}
.secret{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:18px;font-weight:800;background:var(--warnbg);padding:10px 12px;border-radius:10px;word-break:break-all;user-select:all}
#ver{position:fixed;right:10px;bottom:6px;z-index:51;font-size:11px;color:#a7b3ba;font-family:ui-monospace,Menlo,Consolas,monospace;pointer-events:none;letter-spacing:.3px}
bdi.nw{white-space:nowrap}
@media(max-width:430px){.brand span{display:none}header.top .btn.ghost{padding:6px 10px;font-size:13px}}

/* admin dashboard + preview (Oct 2026) */
.anav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.anav .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;padding-top:6px;padding-bottom:6px}
.anav a{padding:8px 2px;border-radius:10px;text-decoration:none;color:var(--teal);font-weight:700;font-size:14px;white-space:nowrap;text-align:center}
.anav a.on{background:var(--teal);color:#fff}
.kpis{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:14px}
@media(min-width:640px){.kpis{grid-template-columns:repeat(4,1fr)}}
.kpis .card{padding:14px;text-align:center}
.kpis b{display:block;font-size:26px;color:var(--teal)}
.kpis span{font-size:13px;color:var(--muted)}
.tiles{display:grid;grid-template-columns:1fr;gap:8px;margin-top:10px}
@media(min-width:560px){.tiles{grid-template-columns:1fr 1fr}}
.codebig{display:flex;flex-direction:column;align-items:center;background:var(--okbg);border:1.5px solid var(--ok);border-radius:12px;padding:12px;margin:10px 0 14px}
.codebig b{font-size:40px;line-height:1.1;color:var(--teal);letter-spacing:1px}
.codebig span{font-size:13px;color:var(--muted)}
.codebig.light{background:var(--bg);border-color:var(--line)}
.pvbar{background:var(--warnbg);border-bottom:1px solid #f0d9a8;font-size:13px;padding:7px 0;color:#6b4e00}
.termsbox{max-height:220px;overflow:auto;border:1px solid var(--line);border-radius:12px;padding:4px 14px;background:var(--bg);font-size:14px}
.termsbox h3{font-size:16px}
.nbadge{display:inline-block;min-width:20px;padding:0 6px;border-radius:10px;background:var(--acc);color:#fff;font-size:12px;line-height:20px;text-align:center;margin-left:4px}
.tag.amber{background:#fff1d6;color:#8a5a00}
.pend{border-color:#f0c56a!important;background:#fffbf2}
.refbox{display:flex;align-items:center;justify-content:space-between;gap:10px;background:#0f3d4c;color:#fff;border-radius:12px;padding:10px 12px;margin:4px 0 10px}
.refbox code{font-size:18px;font-weight:800;letter-spacing:.5px;word-break:break-all;font-family:ui-monospace,Menlo,Consolas,monospace}
.pitem{border-top:1px solid #f0d9a8;padding:10px 0}
.mono{font-family:ui-monospace,Menlo,Consolas,monospace}
[dir=rtl] .steps li,.steps[dir=rtl] li{padding:10px 44px 10px 0}
[dir=rtl] .steps li:before,.steps[dir=rtl] li:before{left:auto;right:0}

/* colloquium EN|FR language toggle + collapsible Arabic explanation (FR mode) */
.clangbar{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.clangrow{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:10px;flex-wrap:wrap}
.seg.clang button{min-width:44px}
.ar-exp{margin-top:12px;border-top:1px dashed var(--line);padding-top:8px}
.ar-exp>summary{cursor:pointer;font-weight:700;text-align:right;list-style-position:inside;color:var(--teal)}
.ar-exp>div{margin-top:6px}

/* student ratings (Oct 20 2026): public block (only when SITE_CONFIG.SHOW_RATINGS) + the student "Rate us" sheet */
.ratings .rlist{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin-top:12px}
.ratings .rcard{margin:0}.ratings blockquote{margin:6px 0 8px;white-space:pre-line}.rstars{color:#f2a900;font-size:18px;letter-spacing:2px}
.rate-ov{position:fixed;inset:0;background:rgba(15,35,45,.35);z-index:50;display:flex;align-items:flex-end;justify-content:center;padding:12px}
@media(min-width:640px){.rate-ov{align-items:center}}
.rate-sheet{background:#fff;border-radius:18px;max-width:440px;width:100%;padding:20px 18px 16px;box-shadow:0 10px 40px rgba(0,0,0,.18);max-height:92vh;overflow:auto;-webkit-user-select:text;user-select:text}
.rate-sheet h2{font-size:19px;margin:0 0 4px}.rate-sheet .ar{font-family:"IBM Plex Sans Arabic",Inter,sans-serif}
.rate-sheet .stars{display:flex;justify-content:center;gap:6px;margin:14px 0 6px}
.rate-sheet .stars button{background:none;border:0;font-size:38px;line-height:1;color:#cfd8dc;cursor:pointer;padding:4px;min-width:48px;min-height:48px}
.rate-sheet .stars button.on{color:#f2a900}
.rate-sheet .slabel{text-align:center;font-weight:700;min-height:22px;color:var(--teal)}
.rate-sheet textarea{min-height:88px;resize:vertical;-webkit-user-select:text;user-select:text;margin-top:10px}
.rate-sheet .acts{display:flex;gap:10px;margin-top:12px}.rate-sheet .acts .btn{flex:1;padding:12px 8px;font-size:15px;white-space:nowrap}
.rate-sheet .x{float:right;background:none;border:0;font-size:24px;line-height:1;color:var(--muted);cursor:pointer;padding:2px 6px;min-height:36px}
.btn.rate{border-color:#f2d27a}

/* Oct 20 2026: small reference line at the end of each question / case (replaces the visible watermark) */
.refline{margin-top:12px;text-align:right;font-size:10.5px;line-height:1.2;color:#b4bfc5;font-family:ui-monospace,Menlo,Consolas,monospace;letter-spacing:.2px;font-weight:400}
.refline.reftop{margin:-6px 0 12px}