/* MCS6133 · MMU course hub */
:root{
  --blue:#0451a5; --blue-2:#0a64c6; --blue-ink:#032f63; --red:#ed1c24; --red-ink:#b3121a;
  --bg:#f4f7fc; --surface:#ffffff; --surface-2:#eef3fb; --line:#dbe3f0; --ink:#13213a; --muted:#5b6a83;
  --ok:#0f8a5f; --ok-bg:#e3f6ee; --bad:#c62828; --bad-bg:#fdecec; --warn:#a86500; --warn-bg:#fff4dd;
  --a1:#0451a5; --a2:#ed1c24; --a3:#7b3fc4; --a4:#0f8a5f;
  --shadow:0 1px 2px rgba(10,30,70,.06),0 6px 24px rgba(10,30,70,.06);
  --r:16px; --r-sm:10px; --ease:cubic-bezier(.22,.61,.36,1);
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif; --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --scale:1;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0b1220; --surface:#121b2e; --surface-2:#18233a; --line:#26324b; --ink:#e6ecf7; --muted:#9aa8c2;
  --blue:#5b9dff; --blue-2:#7cb1ff; --blue-ink:#cfe0ff; --red:#ff5a60; --red-ink:#ff8a8f;
  --ok:#3ccf91; --ok-bg:#0f2e24; --bad:#ff6b6b; --bad-bg:#3a1717; --warn:#ffbf4d; --warn-bg:#33270f;
  --a1:#5b9dff; --a2:#ff5a60; --a3:#b48aff; --a4:#3ccf91; --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 28px rgba(0,0,0,.25); color-scheme:dark;
}}
:root[data-theme="dark"]{
  --bg:#0b1220; --surface:#121b2e; --surface-2:#18233a; --line:#26324b; --ink:#e6ecf7; --muted:#9aa8c2;
  --blue:#5b9dff; --blue-2:#7cb1ff; --blue-ink:#cfe0ff; --red:#ff5a60; --red-ink:#ff8a8f;
  --ok:#3ccf91; --ok-bg:#0f2e24; --bad:#ff6b6b; --bad-bg:#3a1717; --warn:#ffbf4d; --warn-bg:#33270f;
  --a1:#5b9dff; --a2:#ff5a60; --a3:#b48aff; --a4:#3ccf91; --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 28px rgba(0,0,0,.25); color-scheme:dark;
}
*{box-sizing:border-box}
html{font-size:calc(16px * var(--scale));scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--blue)}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:3px solid var(--blue-2);outline-offset:2px;border-radius:6px}
h1,h2,h3,h4{line-height:1.2;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(1.7rem,3.4vw,2.6rem)} h2{font-size:clamp(1.3rem,2.2vw,1.7rem)} h3{font-size:1.1rem}
p{margin:0 0 .8em}
code,kbd{font-family:var(--mono);font-size:.88em}
kbd{background:var(--surface-2);border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:1px 6px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* Top bar */
.top{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.top-in{max-width:1280px;margin:0 auto;display:flex;align-items:center;gap:14px;padding:10px 20px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);min-width:0}
.brand img{height:34px;width:auto;display:block}
:root[data-theme="dark"] .brand img,.logo-chip{background:#fff;border-radius:8px;padding:3px 6px}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .brand img{background:#fff;border-radius:8px;padding:3px 6px}}
.brand>span{min-width:0;overflow:hidden}
.brand b{display:block;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand small{display:block;color:var(--muted);font-size:.75rem;white-space:nowrap}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{padding:8px 12px;border-radius:999px;text-decoration:none;color:var(--muted);font-weight:600;font-size:.92rem;white-space:nowrap}
.nav a:hover{background:var(--surface-2);color:var(--ink)}
.nav a.on{background:var(--blue);color:#fff}
.icon-btn{border:1px solid var(--line);background:var(--surface);border-radius:999px;width:38px;height:38px;display:grid;place-items:center;font-size:1rem;flex:none}
.icon-btn:hover{background:var(--surface-2)}
.menu-btn{display:none}

/* Week rail */
.rail{max-width:1280px;margin:0 auto;padding:8px 20px 10px;display:flex;gap:6px;overflow-x:auto;scrollbar-width:thin}
.rail a{flex:none;min-width:44px;height:36px;padding:0 10px;display:grid;place-items:center;border-radius:10px;border:1px solid var(--line);background:var(--surface);text-decoration:none;color:var(--ink);font-weight:700;font-size:.88rem;position:relative}
.rail a:hover{border-color:var(--blue)}
.rail a.now{border-color:var(--red);box-shadow:inset 0 0 0 1px var(--red)}
.rail a.on{background:var(--blue);border-color:var(--blue);color:#fff}
.rail a.past{color:var(--muted)}
.rail a .dot{position:absolute;top:-3px;right:-3px;width:10px;height:10px;border-radius:50%;background:var(--red);border:2px solid var(--surface)}

main{max-width:1280px;margin:0 auto;padding:24px 20px 120px}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--shadow);min-width:0}
.card h3{display:flex;align-items:center;gap:8px}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.eyebrow{font-size:.74rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--red)}
.pill{display:inline-flex;align-items:center;gap:6px;padding:3px 10px;border-radius:999px;font-size:.78rem;font-weight:700;background:var(--surface-2);color:var(--muted);border:1px solid var(--line)}
.pill.red{background:var(--red);color:#fff;border-color:var(--red)}
.pill.blue{background:var(--blue);color:#fff;border-color:var(--blue)}
.pill.warn{background:var(--warn-bg);color:var(--warn);border-color:transparent}
.pill.ok{background:var(--ok-bg);color:var(--ok);border-color:transparent}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border-radius:12px;border:1px solid var(--line);background:var(--surface);font-weight:700;text-decoration:none;color:var(--ink);font-size:.92rem}
.btn:hover{border-color:var(--blue)}
.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn.primary:hover{background:var(--blue-2)}
.btn.red{background:var(--red);border-color:var(--red);color:#fff}
.btn.sm{padding:6px 12px;font-size:.84rem;border-radius:10px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.spacer{flex:1}
.notice{border-radius:12px;padding:12px 14px;background:var(--warn-bg);color:var(--warn);font-size:.9rem;border:1px solid color-mix(in srgb,var(--warn) 25%,transparent)}
.notice.info{background:var(--surface-2);color:var(--ink);border-color:var(--line)}
ul.clean{list-style:none;padding:0;margin:0}
ul.ticks{padding-left:1.2em;margin:0}
ul.ticks li{margin:.25em 0}

/* Hero */
.hero{position:relative;overflow:hidden;border-radius:24px;padding:32px;background:linear-gradient(135deg,#0451a5 0%,#03397a 60%,#022a5c 100%);color:#fff;box-shadow:var(--shadow)}
.hero::after{content:"";position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,#ed1c24 0 34%,transparent 35%);opacity:.9}
.hero::before{content:"";position:absolute;right:120px;bottom:-140px;width:280px;height:280px;border-radius:50%;border:38px solid rgba(255,255,255,.07)}
.hero>*{position:relative;z-index:1}
.hero .eyebrow{color:#ffd1d3}
.hero h1{max-width:760px}
.hero p{color:#d6e4ff;max-width:680px}
.hero .btn{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.25);color:#fff}
.hero .btn.primary{background:#fff;color:#0451a5;border-color:#fff}
.hero .btn.red{background:#ed1c24;border-color:#ed1c24}
.stats{display:flex;gap:28px;flex-wrap:wrap;margin-top:22px}
.stats div b{display:block;font-size:1.7rem;line-height:1}
.stats div span{font-size:.8rem;color:#bcd2ff}

/* Timeline */
.timeline{display:grid;grid-template-columns:repeat(14,minmax(0,1fr));gap:6px;margin-top:8px}
.tl{border-radius:10px;padding:8px 6px;background:var(--surface-2);border:1px solid var(--line);text-decoration:none;color:var(--ink);min-height:84px;display:flex;flex-direction:column;gap:4px;font-size:.72rem;position:relative}
.tl b{font-size:.95rem}
.tl:hover{border-color:var(--blue)}
.tl.now{background:var(--blue);color:#fff;border-color:var(--blue)}
.tl.now .muted{color:#cfe0ff}
.tl .tag{display:block;border-radius:6px;padding:2px 4px;font-weight:700;color:#fff;font-size:.68rem;line-height:1.2}
.tl .tag.brief{background:transparent;color:var(--blue);border:1px dashed currentColor}
.tl.now .tag.brief{color:#fff}

/* Assessment bars */
.weights{display:flex;height:16px;border-radius:999px;overflow:hidden;margin:10px 0 14px}
.weights span{display:block}
.akey{display:grid;grid-template-columns:14px 1fr auto;gap:8px 10px;align-items:center;font-size:.9rem}
.akey i{width:14px;height:14px;border-radius:4px;display:block}

/* Week page */
.week-head{display:flex;gap:18px;align-items:flex-start;flex-wrap:wrap}
.wk-num{width:84px;height:84px;border-radius:22px;background:var(--blue);color:#fff;display:grid;place-items:center;flex:none;font-weight:800;text-align:center;line-height:1}
.wk-num small{display:block;font-size:.68rem;letter-spacing:.12em;opacity:.8}
.wk-num b{font-size:2.2rem}
.toc{display:flex;gap:6px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;margin:18px 0 6px;position:sticky;top:117px;z-index:5;padding:8px 0;background:linear-gradient(var(--bg) 80%,transparent)}
.toc::-webkit-scrollbar{display:none}
.toc a{flex:none;white-space:nowrap;padding:6px 12px;border-radius:999px;background:var(--surface);border:1px solid var(--line);text-decoration:none;color:var(--ink);font-size:.84rem;font-weight:600}
.toc a:hover{border-color:var(--blue);color:var(--blue)}
.act{scroll-margin-top:170px;margin-top:22px}
.act>.card{padding:24px}
.act-h{display:flex;align-items:center;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.act-h h2{margin:0}
.act-h .num{width:34px;height:34px;border-radius:10px;background:var(--surface-2);color:var(--blue);display:grid;place-items:center;font-weight:800;flex:none}
.act-h .tools{margin-left:auto;display:flex;gap:6px}
.act.fs-on{position:fixed;inset:0;z-index:80;margin:0;background:var(--bg);overflow:auto;padding:24px;font-size:1.25rem}
.act.fs-on>.card{max-width:1200px;margin:0 auto;min-height:calc(100vh - 48px)}

.big-def{font-size:clamp(1.25rem,2.4vw,1.8rem);font-weight:650;line-height:1.35;padding:22px 24px;border-left:6px solid var(--red);background:var(--surface-2);border-radius:0 14px 14px 0;margin:0 0 14px}
.tiles{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.tile{background:var(--surface-2);border:1px solid var(--line);border-radius:14px;padding:16px;min-width:0}
.tile .e{font-size:1.8rem;line-height:1;display:block;margin-bottom:8px}
.tile b{display:block;margin-bottom:2px}
.tile p{margin:0;color:var(--muted);font-size:.9rem}
.tile.flip{cursor:pointer;transition:transform .25s var(--ease)}
.tile.flip:hover{transform:translateY(-2px);border-color:var(--blue)}
.tile .back{display:none;margin-top:8px;padding-top:8px;border-top:1px dashed var(--line);color:var(--ink);font-size:.88rem}
.tile.open .back{display:block}

/* Flow */
.flow{display:grid;grid-template-columns:repeat(var(--n,4),minmax(0,1fr));gap:12px;position:relative;margin:10px 0 16px}
.flow .st{background:var(--surface-2);border:2px solid var(--line);border-radius:16px;padding:16px;text-align:center;opacity:.45;transform:scale(.97);transition:all .35s var(--ease);position:relative}
.flow .st.lit{opacity:1;transform:none;border-color:var(--blue);background:var(--surface)}
.flow .st.cur{box-shadow:0 0 0 4px color-mix(in srgb,var(--blue) 25%,transparent)}
.flow .st .e{font-size:2rem;display:block}
.flow .st b{display:block;margin:6px 0 2px}
.flow .st p{margin:0;font-size:.86rem;color:var(--muted)}
.flow .st:not(:last-child)::after{content:"→";position:absolute;right:-12px;top:50%;transform:translate(50%,-50%);color:var(--muted);font-weight:800;z-index:2}
.packet{position:absolute;top:-10px;width:22px;height:22px;border-radius:50%;background:var(--red);box-shadow:0 0 0 6px color-mix(in srgb,var(--red) 20%,transparent);transition:left .5s var(--ease);z-index:3}
.seg{display:inline-flex;background:var(--surface-2);border:1px solid var(--line);border-radius:12px;padding:3px}
.seg button{border:0;background:transparent;padding:7px 12px;border-radius:9px;font-weight:600;font-size:.88rem;color:var(--muted)}
.seg button.on{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}

/* Screens demo */
.screens{display:grid;grid-template-columns:1.6fr 1fr;gap:18px;align-items:end}
.dev{border:10px solid #1d2638;border-radius:18px;background:#fff;color:#13213a;overflow:hidden}
.dev.phone{max-width:240px;border-radius:30px;margin:0 auto}
.dev .bar{background:#0451a5;color:#fff;padding:8px 12px;font-weight:700;font-size:.85rem;display:flex;justify-content:space-between;align-items:center}
.dev .bar nav{display:flex;gap:10px;font-weight:500;font-size:.78rem}
.dev .cols{display:grid;grid-template-columns:2fr 1fr;gap:8px;padding:10px}
.dev .blk{background:#e6edf8;border-radius:6px;min-height:34px}
.dev .blk.h{min-height:80px}
.dev.phone .cols{grid-template-columns:1fr}
.dev .tapbtn{display:block;margin:10px;background:#ed1c24;color:#fff;border:0;border-radius:10px;padding:12px;font-weight:700;width:calc(100% - 20px)}
.dev .hoverbtn{font-size:.7rem;padding:3px 6px;margin:0 10px 10px;border:1px solid #c5d2e6;border-radius:4px;background:#fff;color:#13213a}

/* Tables */
table.t{width:100%;border-collapse:collapse;font-size:.95rem}
table.t th,table.t td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
table.t th{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
table.t tr.hl td{background:color-mix(in srgb,var(--blue) 8%,transparent)}
.scroll-x{overflow-x:auto}

/* Sort / choice games */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:14px}
.chip{border:2px solid var(--line);background:var(--surface);border-radius:14px;padding:10px 14px;font-weight:700;display:inline-flex;gap:8px;align-items:center}
.chip.sel{border-color:var(--blue);box-shadow:0 0 0 3px color-mix(in srgb,var(--blue) 20%,transparent)}
.chip.right{border-color:var(--ok);background:var(--ok-bg)}
.chip.wrong{border-color:var(--bad);background:var(--bad-bg)}
.bins{display:grid;grid-template-columns:repeat(var(--n,3),minmax(0,1fr));gap:12px}
.bin{border:2px dashed var(--line);border-radius:16px;padding:14px;min-height:130px;background:var(--surface-2);transition:border-color .2s}
.bin.ready{border-color:var(--blue);cursor:pointer}
.bin h4{margin:0 0 10px;font-size:.95rem}
.bin .chips{margin:0}
.bin .chip{font-size:.88rem;padding:6px 10px}

/* Quiz */
.quiz-q{font-size:1.2rem;font-weight:700;margin-bottom:14px}
.opts{display:grid;gap:10px}
.opt{text-align:left;border:2px solid var(--line);background:var(--surface);border-radius:14px;padding:12px 16px;font-weight:600;display:flex;gap:12px;align-items:center}
.opt:hover:not([disabled]){border-color:var(--blue)}
.opt .k{width:28px;height:28px;border-radius:8px;background:var(--surface-2);display:grid;place-items:center;font-weight:800;flex:none;font-size:.85rem}
.opt.right{border-color:var(--ok);background:var(--ok-bg)}
.opt.wrong{border-color:var(--bad);background:var(--bad-bg)}
.why{margin-top:12px;padding:12px 14px;border-radius:12px;background:var(--surface-2)}
.progress{height:8px;background:var(--surface-2);border-radius:999px;overflow:hidden;margin:6px 0 16px}
.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--red));border-radius:999px;transition:width .3s var(--ease)}

/* Flashcards */
.fc-wrap{perspective:1200px;max-width:640px;margin:0 auto}
.fc{position:relative;height:240px;transform-style:preserve-3d;transition:transform .5s var(--ease);cursor:pointer}
.fc.flipped{transform:rotateY(180deg)}
.fc>div{position:absolute;inset:0;backface-visibility:hidden;border-radius:20px;display:grid;place-items:center;padding:28px;text-align:center;border:1px solid var(--line)}
.fc .front{background:var(--blue);color:#fff;font-size:1.6rem;font-weight:800;font-family:var(--mono)}
.fc .backf{background:var(--surface-2);transform:rotateY(180deg);font-size:1.1rem}

/* Playground */
.pg{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.pg textarea{width:100%;min-height:340px;resize:vertical;border:1px solid var(--line);border-radius:14px;padding:14px;background:#0e1626;color:#e6ecf7;font-family:var(--mono);font-size:.88rem;line-height:1.55;tab-size:2}
.pg iframe{width:100%;min-height:340px;height:100%;border:1px solid var(--line);border-radius:14px;background:#fff}
.presets{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}
.presets button{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:6px 12px;font-size:.84rem;font-weight:600}
.presets button.on{background:var(--blue);color:#fff;border-color:var(--blue)}
.presets button small{opacity:.65;margin-left:4px;font-weight:500}

/* Table lab */
.lab{display:grid;grid-template-columns:280px 1fr;gap:18px;align-items:start}
.lab label{display:block;font-weight:600;font-size:.9rem;margin:10px 0 4px}
.lab input[type=range]{width:100%}
.lab-out table{border-collapse:collapse;margin-bottom:12px}
.lab-out td,.lab-out th{border:2px solid var(--blue);padding:14px 20px;text-align:center;min-width:60px}
.lab-out th{background:color-mix(in srgb,var(--blue) 15%,transparent)}
pre.code{background:#0e1626;color:#e6ecf7;border-radius:12px;padding:14px;overflow:auto;font-size:.84rem;margin:0}

/* Naming game */
.name-row{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}
.name-row code{background:var(--surface-2);padding:6px 10px;border-radius:8px;word-break:break-all}
.name-row input{width:100%;border:2px solid var(--line);border-radius:10px;padding:8px 10px;font-family:var(--mono);font-size:.88rem;background:var(--surface)}
.name-row input.right{border-color:var(--ok);background:var(--ok-bg)}
.name-row input.wrong{border-color:var(--bad)}

/* Viewport sim */
.vp-stage{display:flex;justify-content:center;background:var(--surface-2);border-radius:16px;padding:20px;overflow:auto}
.vp-frame{border:10px solid #1d2638;border-radius:22px;background:#fff;transition:width .35s var(--ease),height .35s var(--ease);overflow:hidden;flex:none}
.vp-frame iframe{width:100%;height:100%;border:0;display:block}

/* Prompts */
.prompts{counter-reset:p;display:grid;gap:10px}
.prompt{counter-increment:p;display:flex;gap:14px;align-items:flex-start;background:var(--surface-2);border:1px solid var(--line);border-radius:14px;padding:14px 16px;cursor:pointer}
.prompt::before{content:counter(p);width:30px;height:30px;border-radius:9px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:800;flex:none}
.prompt.done{opacity:.55}
.prompt.done::before{content:"✓";background:var(--ok)}
.prompt.spot{border-color:var(--red);box-shadow:0 0 0 3px color-mix(in srgb,var(--red) 18%,transparent);font-size:1.15rem}

/* Rubric */
.rubric{display:grid;gap:14px}
.rb{border:1px solid var(--line);border-radius:14px;overflow:hidden}
.rb-h{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;background:var(--surface-2);font-weight:700;gap:10px}
.rb-levels{display:grid;grid-template-columns:repeat(5,minmax(0,1fr))}
.rb-levels button{border:0;border-left:1px solid var(--line);background:var(--surface);text-align:left;padding:12px;font-size:.84rem;line-height:1.4;display:flex;flex-direction:column;gap:6px}
.rb-levels button:first-child{border-left:0}
.rb-levels button b{font-size:.78rem;color:var(--muted)}
.rb-levels button:hover{background:var(--surface-2)}
.rb-levels button.on{background:color-mix(in srgb,var(--blue) 12%,var(--surface));box-shadow:inset 0 -4px 0 var(--blue)}
.score-big{font-size:2.6rem;font-weight:800;line-height:1;color:var(--blue)}

/* Tabs */
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin:18px 0}
.tabs button{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:9px 16px;font-weight:700;font-size:.9rem}
.tabs button.on{background:var(--ink);color:var(--surface);border-color:var(--ink)}

/* Checklist */
.check{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-bottom:1px solid var(--line);cursor:pointer}
.check input{width:20px;height:20px;margin-top:2px;accent-color:var(--blue);flex:none}
.check.done span{text-decoration:line-through;color:var(--muted)}

/* Calculator */
.calc{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.calc label{font-weight:600;font-size:.9rem;display:block;margin-bottom:6px}
.calc input{width:100%;border:2px solid var(--line);border-radius:12px;padding:10px 12px;font-size:1.2rem;font-weight:700;background:var(--surface)}
.verdict{margin-top:14px;border-radius:14px;padding:16px;font-weight:700;font-size:1.05rem}
.verdict.pass{background:var(--ok-bg);color:var(--ok)}
.verdict.fail{background:var(--bad-bg);color:var(--bad)}
.meter{height:12px;border-radius:999px;background:var(--surface-2);position:relative;margin:6px 0 2px;overflow:visible}
.meter i{position:absolute;inset:0 auto 0 0;border-radius:999px}
.meter u{position:absolute;top:-4px;bottom:-4px;width:2px;background:var(--ink);text-decoration:none}

/* Countdown & now card */
.now-card{border-left:6px solid var(--red)}
.cd{display:flex;gap:10px}
.cd div{background:var(--surface-2);border-radius:12px;padding:10px 12px;text-align:center;min-width:64px}
.cd b{display:block;font-size:1.5rem;line-height:1}
.cd span{font-size:.72rem;color:var(--muted)}
.sec-pick{display:flex;gap:6px;flex-wrap:wrap}
.sec-pick button{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:6px 10px;font-weight:700;font-size:.85rem}
.sec-pick button.on{background:var(--red);color:#fff;border-color:var(--red)}

/* Presenter dock */
.dock{position:fixed;right:18px;bottom:18px;z-index:60;display:flex;gap:6px;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:6px;box-shadow:0 10px 40px rgba(0,0,0,.18)}
.dock button{width:42px;height:42px;border-radius:50%;border:0;background:transparent;font-size:1.1rem;display:grid;place-items:center}
.dock button:hover{background:var(--surface-2)}
.dock .sep{width:1px;background:var(--line);margin:6px 2px}
.dock button[data-tip]{position:relative}
.dock button[data-tip]:hover::after{content:attr(data-tip);position:absolute;bottom:52px;right:0;white-space:nowrap;background:var(--ink);color:var(--surface);padding:5px 9px;border-radius:8px;font-size:.75rem;font-weight:600}

/* Overlays */
.ov{position:fixed;inset:0;z-index:90;background:rgba(5,12,28,.72);backdrop-filter:blur(6px);display:grid;place-items:center;padding:20px}
.ov-box{background:var(--surface);border-radius:24px;padding:28px;width:min(720px,100%);max-height:90vh;overflow:auto;position:relative;box-shadow:0 30px 80px rgba(0,0,0,.4)}
.ov-x{position:absolute;top:14px;right:14px}
.timer-face{font-size:clamp(4rem,16vw,10rem);font-weight:800;text-align:center;font-variant-numeric:tabular-nums;letter-spacing:-.03em;line-height:1;margin:10px 0 18px;color:var(--blue)}
.timer-face.low{color:var(--red);animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.55}}
.timer-ring{height:10px;background:var(--surface-2);border-radius:999px;overflow:hidden;margin-bottom:18px}
.timer-ring i{display:block;height:100%;background:var(--blue);transition:width 1s linear}
.picker-out{font-size:clamp(4rem,18vw,9rem);font-weight:800;text-align:center;color:var(--red);line-height:1;margin:10px 0;font-variant-numeric:tabular-nums}
.timer-mini{position:fixed;left:50%;transform:translateX(-50%);top:10px;z-index:70;background:var(--ink);color:var(--surface);border-radius:999px;padding:6px 16px;font-weight:800;font-variant-numeric:tabular-nums;cursor:pointer;box-shadow:var(--shadow)}
.timer-mini.low{background:var(--red);color:#fff}
.keys{display:grid;grid-template-columns:auto 1fr;gap:8px 16px;align-items:center}

/* Materials */
.file{display:flex;gap:14px;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}
.file .ft{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-weight:800;font-size:.72rem;color:#fff;flex:none}
.ft.PDF{background:var(--red)} .ft.PPTX{background:#c55a11} .ft.DOCX{background:var(--blue)}
.file .meta{flex:1;min-width:0}
.file .meta b{display:block}

footer{max-width:1280px;margin:0 auto;padding:0 20px 100px;color:var(--muted);font-size:.82rem}

/* Focus (presenting) mode */
body.focus .top,body.focus footer,body.focus .toc{display:none}
body.focus main{padding-top:16px}

@media (max-width:1000px){
  .g4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .g3{grid-template-columns:1fr 1fr}
  .timeline{grid-template-columns:repeat(7,minmax(0,1fr))}
  .pg,.lab,.screens{grid-template-columns:1fr}
}
@media (max-width:760px){
  main{padding:16px 16px 110px}
  .top-in,.rail{padding-left:16px;padding-right:16px}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .menu-btn{display:grid}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--line);flex-direction:column;padding:10px 16px}
  .nav.open{display:flex}
  .brand small{display:none}
  .hero{padding:24px}
  .hero::after{width:200px;height:200px;right:-70px;top:-70px}
  .flow{grid-template-columns:1fr 1fr}
  .flow .st:not(:last-child)::after{display:none}
  .bins{grid-template-columns:1fr}
  .rb-levels{grid-template-columns:1fr}
  .rb-levels button{border-left:0;border-top:1px solid var(--line)}
  .name-row{grid-template-columns:1fr}
  .name-row .arrow{display:none}
  .calc{grid-template-columns:1fr}
  .toc{top:104px}
  .timeline{grid-template-columns:repeat(4,minmax(0,1fr))}
  .dock{right:50%;transform:translateX(50%);bottom:12px;gap:2px;padding:4px}
  .dock button{width:38px;height:38px;font-size:1rem}
  .dock [data-act=smaller],.dock [data-act=bigger],.dock [data-act=help]{display:none}
  .top-in{gap:8px}
  .brand{flex:1}
  .act.fs-on{padding:10px;font-size:1rem}
}

/* ===== v2: motion, welcome, about, simulator ===== */
.theme-anim,.theme-anim *{transition:background-color .4s var(--ease),color .4s var(--ease),border-color .4s var(--ease)!important}
.theme-btn span{display:inline-block;transition:transform .5s var(--ease)}
.theme-btn:hover span{transform:rotate(25deg) scale(1.1)}
.linkish{border:0;background:none;color:var(--blue);text-decoration:underline;padding:0;font-size:inherit}

/* page + reveal */
.page-in{animation:pageIn .45s var(--ease)}
@keyframes pageIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.rv{opacity:0;transform:translateY(22px) scale(.985)}
.rv.in{opacity:1;transform:none;transition:opacity .6s var(--ease) var(--d,0ms),transform .6s var(--ease) var(--d,0ms),box-shadow .25s,border-color .25s}
.card{transition:transform .25s var(--ease),box-shadow .25s,border-color .25s}
a.card:hover,.card.lift:hover{transform:translateY(-4px);box-shadow:0 14px 36px rgba(10,30,70,.13)}
.tile{transition:transform .25s var(--ease),border-color .25s,box-shadow .25s}
.tile:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--blue) 45%,var(--line));box-shadow:0 10px 26px rgba(10,30,70,.08)}
.tile:hover .e{animation:bob .6s var(--ease)}
@keyframes bob{40%{transform:translateY(-5px) rotate(-6deg)}}
.btn{transition:transform .18s var(--ease),background .2s,border-color .2s,box-shadow .2s}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:scale(.97)}
.btn.primary{box-shadow:0 6px 18px color-mix(in srgb,var(--blue) 30%,transparent)}
.rail a{transition:transform .18s var(--ease),border-color .2s,background .2s}
.rail a:hover{transform:translateY(-2px)}
.rail a.now:not(.on){animation:nowPulse 2.4s infinite}
@keyframes nowPulse{0%,100%{box-shadow:inset 0 0 0 1px var(--red),0 0 0 0 color-mix(in srgb,var(--red) 40%,transparent)}60%{box-shadow:inset 0 0 0 1px var(--red),0 0 0 7px transparent}}
.tl{transition:transform .2s var(--ease),border-color .2s}
.tl:hover{transform:translateY(-3px)}
.opt{transition:transform .15s var(--ease),border-color .2s,background .2s}
.opt.right{animation:pop .35s var(--ease)}
.opt.wrong{animation:shake .4s}
.chip{transition:transform .15s var(--ease),border-color .2s,background .2s}
.chip:hover{transform:translateY(-2px)}
.chip.right{animation:pop .35s var(--ease)}
@keyframes pop{50%{transform:scale(1.04)}}
@keyframes shake{20%,60%{transform:translateX(-6px)}40%,80%{transform:translateX(6px)}}
.flow .st.cur .e{animation:bob .7s var(--ease)}
.prompt{transition:transform .2s var(--ease),opacity .3s,border-color .2s}
.prompt:hover{transform:translateX(4px)}

/* overlays */
.ov{animation:ovIn .25s ease}
.ov-box{animation:boxIn .4s var(--ease)}
@keyframes ovIn{from{opacity:0}}
@keyframes boxIn{from{opacity:0;transform:translateY(18px) scale(.96)}}
.ov-box.wide{width:min(940px,100%);padding:0;overflow:hidden}
.ov-box.wide .ov-x{z-index:3;background:color-mix(in srgb,var(--surface) 85%,transparent)}

/* confetti */
.confetti{position:fixed;inset:0;pointer-events:none;z-index:120;overflow:hidden}
.confetti i{position:absolute;top:-16px;width:8px;height:14px;border-radius:2px;animation:fall 1.6s cubic-bezier(.25,.6,.4,1) forwards}
@keyframes fall{to{transform:translate(var(--x),105vh) rotate(var(--r));opacity:.9}}

/* hero v2 */
.hero{background:radial-gradient(420px circle at var(--mx,-999px) var(--my,-999px),rgba(255,255,255,.13),transparent 60%),linear-gradient(135deg,#0451a5 0%,#03397a 60%,#022a5c 100%)}
.hero::after{animation:float1 9s ease-in-out infinite}
.hero::before{animation:spin 40s linear infinite}
@keyframes float1{50%{transform:translate(-18px,16px) scale(1.05)}}
@keyframes spin{to{transform:rotate(360deg)}}
.hero-orb{position:absolute;border-radius:50%;filter:blur(2px);opacity:.5;pointer-events:none;z-index:0}
.hero-orb.o1{width:14px;height:14px;background:#ffd45f;left:46%;top:18%;animation:drift 7s ease-in-out infinite}
.hero-orb.o2{width:10px;height:10px;background:#fff;left:8%;bottom:14%;animation:drift 9s ease-in-out infinite reverse}
.hero-orb.o3{width:18px;height:18px;background:#ed1c24;left:58%;bottom:10%;animation:drift 11s ease-in-out infinite}
@keyframes drift{50%{transform:translate(24px,-30px)}}
.hero-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:28px;align-items:center}
.hero-title span{display:inline-block;animation:wordIn .7s var(--ease) both}
.hero-title span:nth-child(2){animation-delay:.08s}.hero-title span:nth-child(3){animation-delay:.16s}
.hero-title .accent{color:#ff8a8f}
@keyframes wordIn{from{opacity:0;transform:translateY(24px) rotate(2deg)}}
.stats b{font-variant-numeric:tabular-nums}

.sim{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:22px;padding:16px;backdrop-filter:blur(6px);animation:wordIn .8s var(--ease) .2s both}
.sim-head{display:flex;align-items:center;gap:8px;font-size:.78rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:#cfe0ff}
.live{width:9px;height:9px;border-radius:50%;background:#3ccf91;box-shadow:0 0 0 0 rgba(60,207,145,.6);animation:live 1.8s infinite}
@keyframes live{70%{box-shadow:0 0 0 9px transparent}}
.sim svg{width:100%;height:auto;display:block;overflow:visible}
.sim-line{animation:dash 1.2s linear infinite}
@keyframes dash{to{stroke-dashoffset:-26}}
.sim-node circle{fill:rgba(255,255,255,.12);stroke:rgba(255,255,255,.35);stroke-width:1.5;transition:fill .3s,stroke .3s}
.sim-node .ring{fill:none;stroke:transparent;transform-origin:center;transform-box:fill-box}
.sim-node .lbl{fill:#cfe0ff;font-size:11px;font-weight:700;font-family:var(--font)}
.sim-node.on circle:not(.ring){fill:rgba(255,212,95,.28);stroke:#ffd45f}
.sim-node.on .ring{stroke:#ffd45f;animation:ring 1s var(--ease) 2}
.sim-node.done circle:not(.ring){fill:rgba(60,207,145,.25);stroke:#3ccf91}
@keyframes ring{from{transform:scale(1);opacity:1}to{transform:scale(1.7);opacity:0}}
.pkt.req{fill:#ffd45f;filter:drop-shadow(0 0 6px #ffd45f)}
.pkt.res{fill:#3ccf91;filter:drop-shadow(0 0 6px #3ccf91)}
.pkt.amb{fill:rgba(255,255,255,.55)}
.sim-foot{display:flex;gap:10px;align-items:center;justify-content:space-between;margin-top:6px;font-size:.85rem;color:#e3ecff;min-height:40px}
.sim-foot .btn{flex:none}
.sim-foot .btn[disabled]{opacity:.6;cursor:wait}

/* lecturer welcome card */
.me-card{display:flex;gap:16px;align-items:center;padding:16px;border-radius:18px;margin-bottom:12px;background:linear-gradient(135deg,color-mix(in srgb,var(--blue) 12%,var(--surface)),color-mix(in srgb,var(--red) 9%,var(--surface)));border:1px solid color-mix(in srgb,var(--blue) 30%,var(--line));position:relative;overflow:hidden}
.me-card::after{content:"";position:absolute;right:-30px;top:-30px;width:110px;height:110px;border-radius:50%;background:var(--red);opacity:.12}
.me-card h3{margin:2px 0 4px}
.me-card p{margin:0 0 10px}
.me-avatar{position:relative;width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--blue),#032f63);color:#fff;display:grid;place-items:center;font-weight:800;font-size:1.2rem;flex:none;box-shadow:0 0 0 4px var(--surface),0 0 0 6px var(--red)}
.me-avatar .wave{position:absolute;right:-8px;bottom:-6px;font-style:normal;font-size:1.3rem;transform-origin:70% 70%;animation:wave 2.4s ease-in-out infinite}
@keyframes wave{0%,60%,100%{transform:rotate(0)}10%,30%{transform:rotate(16deg)}20%,40%{transform:rotate(-10deg)}}
.ft.avatar{border-radius:50%}

/* lock */
.lock{text-align:center;padding:8px 0}
.lock-ic{font-size:2.6rem;animation:bob 1.6s var(--ease) infinite}
.pin{display:flex;flex-direction:column;align-items:center;gap:10px;margin-top:8px}
.pin-boxes{display:flex;gap:10px}
.pin-boxes input{width:56px;height:64px;text-align:center;font-size:1.6rem;font-weight:800;border:2px solid var(--line);border-radius:14px;background:var(--surface-2);transition:border-color .2s,transform .15s}
.pin-boxes input:focus{border-color:var(--blue);outline:none;transform:translateY(-2px)}
.pin-boxes.shake{animation:shake .4s}
.pin-err{color:var(--bad);min-height:1.2em;margin:0}

/* about slide */
.about{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);min-height:460px}
.about-photo{position:relative;background:linear-gradient(160deg,#bcd3ff,#d9c8ff 60%,#ffe7d6);overflow:hidden}
.about-photo::before{content:"";position:absolute;right:-60px;top:30px;width:190px;height:190px;border-radius:36px;background:#ed1c24;transform:rotate(12deg);opacity:.9;animation:float1 8s ease-in-out infinite}
.about-photo::after{content:"";position:absolute;right:-50px;bottom:-40px;width:200px;height:200px;border-radius:40px;background:#0451a5;transform:rotate(-10deg);animation:float1 10s ease-in-out infinite reverse}
.about-photo img{position:relative;z-index:1;display:block;width:100%;height:100%;object-fit:cover;object-position:center top;animation:wordIn .7s var(--ease)}
.about-badge{position:absolute;left:16px;bottom:16px;z-index:2;background:#fff;color:#13213a;font-weight:800;padding:8px 14px;border-radius:12px;transform:rotate(-3deg);box-shadow:0 8px 24px rgba(0,0,0,.18);font-size:.9rem}
.about-info{padding:32px}
.about-info>*{animation:wordIn .6s var(--ease) both}
.about-info>*:nth-child(2){animation-delay:.06s}.about-info>*:nth-child(3){animation-delay:.12s}.about-info>*:nth-child(4){animation-delay:.18s}.about-info>*:nth-child(5){animation-delay:.24s}
.about-name{font-size:clamp(1.7rem,3.6vw,2.5rem);letter-spacing:-.03em;line-height:1.02;margin:.2em 0 .3em}
.about-name span{display:block}
.about-name .accent{color:var(--blue)}
.about-list li{display:flex;gap:12px;align-items:flex-start;padding:8px 0;border-bottom:1px solid var(--line)}
.about-list i{width:34px;height:34px;border-radius:10px;background:var(--surface-2);display:grid;place-items:center;font-style:normal;flex:none}
.about-list b{display:block;font-size:.85rem}
.about-list span{font-size:.92rem;color:var(--muted)}
.about-list span b{color:var(--ink)}

/* welcome */
.welcome-box{width:min(620px,100%);text-align:center;overflow:hidden}
.welcome-box::before{content:"";position:absolute;inset:0 0 auto 0;height:6px;background:linear-gradient(90deg,#0451a5,#ed1c24,#0451a5);background-size:200% 100%;animation:slide 3s linear infinite}
@keyframes slide{to{background-position:-200% 0}}
.w-logo img{height:56px;width:auto;background:#fff;border-radius:12px;padding:6px 10px;animation:wordIn .6s var(--ease)}
.w-title{font-size:clamp(1.4rem,3.6vw,2rem);margin:.3em 0 .4em;animation:wordIn .6s var(--ease) .08s both}
.w-title .accent{color:var(--red)}
.w-feats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:16px 0}
.w-feats div{background:var(--surface-2);border:1px solid var(--line);border-radius:14px;padding:14px 8px;display:flex;flex-direction:column;gap:2px;animation:wordIn .6s var(--ease) var(--d) both}
.w-feats span{font-size:1.6rem}
.w-feats small{color:var(--muted);font-size:.76rem}
.w-lect{color:var(--muted)}
.w-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-top:8px}
.w-actions label{display:flex;gap:8px;align-items:center;cursor:pointer}
.w-actions input{width:18px;height:18px;accent-color:var(--blue)}

@media (max-width:1000px){.hero-grid{grid-template-columns:1fr}.sim{max-width:520px}}
@media (max-width:760px){
  .about{grid-template-columns:1fr}
  .about-photo{height:300px}
  .about-info{padding:20px}
  .w-feats{grid-template-columns:1fr}
  .w-feats div{flex-direction:row;align-items:center;gap:10px;text-align:left;padding:10px 12px}
  .w-actions{flex-direction:column-reverse;align-items:stretch}
  .w-actions .btn{justify-content:center}
  .me-card{flex-direction:column;align-items:flex-start}
  .pin-boxes input{width:50px;height:58px}
  .sim-foot{flex-direction:column;align-items:stretch;text-align:center}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media print{.top,.dock,.toc,.rail{display:none}.card{box-shadow:none}}

/* ===== v3: assessment format, neutral staff list, credits ===== */
.mode-badge{display:inline-flex;align-items:center;gap:4px;padding:2px 9px;border-radius:999px;font-size:.74rem;font-weight:700;white-space:nowrap;vertical-align:middle}
.mode-badge.pair{background:color-mix(in srgb,var(--a3) 14%,var(--surface));color:var(--a3);border:1px solid color-mix(in srgb,var(--a3) 40%,transparent)}
.mode-badge.tbc{background:var(--surface-2);color:var(--muted);border:1px dashed var(--line)}
.group-callout{display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;margin-top:14px;padding:18px 20px;border-radius:18px;background:linear-gradient(135deg,color-mix(in srgb,var(--a3) 16%,var(--surface)),color-mix(in srgb,var(--blue) 10%,var(--surface)));border:2px solid color-mix(in srgb,var(--a3) 45%,transparent);position:relative;overflow:hidden}
.group-callout h3{margin:2px 0 4px;font-size:1.2rem}
.group-callout p{margin:0}
.group-callout .eyebrow{color:var(--a3)}
.gc-ic{width:58px;height:58px;border-radius:16px;background:var(--a3);color:#fff;display:grid;place-items:center;font-size:1.8rem;animation:bob 2.4s var(--ease) infinite}
.gc-opts{display:flex;flex-direction:column;gap:6px}
.gc-opts span{padding:5px 12px;border-radius:10px;background:var(--surface);border:1px solid var(--line);font-weight:700;font-size:.82rem;text-align:center}
.gc-opts span.no{color:var(--bad);text-decoration:line-through;opacity:.75}
.you-tag{display:none;margin-left:6px;padding:1px 8px;border-radius:999px;background:var(--red);color:#fff;font-size:.68rem;font-weight:800;vertical-align:middle}
.staff li.mine{background:color-mix(in srgb,var(--red) 6%,transparent);border-radius:12px;padding-left:8px;padding-right:8px}
.staff li.mine .you-tag{display:inline-block}
.staff li .btn{flex:none}
.w-sec{margin:6px 0 10px}
.w-sec .sec-pick{justify-content:center}
.w-lect{min-height:1.3em;margin-top:8px}
.w-credit{margin:14px 0 0;font-size:.72rem;color:var(--muted);letter-spacing:.02em}
footer .foot-row{display:flex;gap:12px;justify-content:space-between;flex-wrap:wrap;align-items:baseline}
footer .credit{margin-top:6px;padding-top:8px;border-top:1px solid var(--line)}
@media (max-width:760px){.group-callout{grid-template-columns:1fr}.gc-opts{flex-direction:row;flex-wrap:wrap}.staff li{flex-wrap:wrap}}