/* Socialism site - shared styles. Arial, navy/blue chrome, strand colours. */
:root{
  --navy:#1F2A44; --navy2:#1F4E79; --blue:#2E75B6; --paleblue:#EBF3FB; --paleblue2:#D5E8F0;
  --ink:#1f2937; --muted:#5b6675; --line:#e2e8f0;
  --rev:#B91C1C; --revbg:#fef2f2; --sd:#B45309; --sdbg:#fff7ed; --tw:#0e7490; --twbg:#ecfeff;
  --ao1:#B91C1C; --ao2:#2E75B6; --ao3:#15803D;
  --gold:#D4A017;
  --shadow:0 10px 30px rgba(15,30,60,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:Arial,Helvetica,sans-serif;color:var(--ink);margin:0;background:#f4f7fb;line-height:1.5}
a{color:var(--blue)}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 18px}

/* top nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(31,42,68,.97);color:#fff;backdrop-filter:blur(6px)}
.nav .row{display:flex;align-items:center;gap:6px;max-width:1080px;margin:0 auto;padding:9px 14px;flex-wrap:wrap}
.nav .brand{font-weight:800;font-size:1rem;margin-right:8px;letter-spacing:.02em;white-space:nowrap}
.nav .brand .dot{color:var(--rev)}
.nav a.link{color:#dce6f5;text-decoration:none;font-size:.82rem;font-weight:700;padding:6px 9px;border-radius:7px}
.nav a.link:hover{background:rgba(255,255,255,.12);color:#fff}
.nav a.link.here{background:#fff;color:var(--navy)}
.nav .spacer{flex:1}
.collab-pill{display:inline-flex;align-items:center;gap:7px;background:var(--rev);color:#fff;border:0;font:inherit;font-weight:800;font-size:.8rem;padding:7px 12px;border-radius:999px;cursor:pointer}
.collab-pill .live{width:8px;height:8px;border-radius:50%;background:#fca5a5}
.collab-pill.on{background:#15803D}
.collab-pill.on .live{background:#bbf7d0;animation:pulse 1.4s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}

/* hero */
.hero{background:linear-gradient(130deg,#1b2540 0%,#1F4E79 55%,#2E75B6 100%);color:#fff;padding:40px 0 44px;position:relative;overflow:hidden}
.hero .wrap{position:relative;z-index:2}
.hero .kick{font-size:.8rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:#9fc0e8}
.hero h1{font-size:2.5rem;margin:.2em 0 .15em;line-height:1.05}
.hero p.lead{font-size:1.06rem;color:#e3ecf8;max-width:640px;margin:.2em 0 1.1em}
.hero .cta{display:flex;gap:10px;flex-wrap:wrap}
.btn{font:inherit;font-weight:800;font-size:.9rem;padding:11px 18px;border-radius:10px;border:2px solid transparent;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:8px}
.btn.red{background:var(--rev);color:#fff}
.btn.white{background:#fff;color:var(--navy)}
.btn.ghostw{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.btn.blue{background:var(--blue);color:#fff}
.btn.sm{padding:8px 13px;font-size:.82rem;border-radius:8px}
.btn:active{transform:translateY(1px)}
.hero .fist{position:absolute;right:-30px;top:-10px;font-size:18rem;opacity:.08;z-index:1;line-height:1}

/* section + cards */
section.band{padding:30px 0}
h2.sec{font-size:1.5rem;color:var(--navy2);margin:0 0 4px}
p.seclead{color:var(--muted);margin:.1em 0 18px;max-width:680px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.card{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .16s ease,box-shadow .16s ease;position:relative;overflow:hidden}
.card:hover{transform:translateY(-5px);box-shadow:0 18px 38px rgba(15,30,60,.16)}
.card .ic{font-size:1.6rem}
.card h3{margin:.5em 0 .2em;color:var(--navy2);font-size:1.12rem}
.card p{margin:0;color:var(--muted);font-size:.9rem}
.card .tag{position:absolute;top:12px;right:12px;font-size:.62rem;font-weight:800;text-transform:uppercase;letter-spacing:.05em;padding:3px 8px;border-radius:999px}
.card .edge{position:absolute;left:0;top:0;bottom:0;width:6px}

/* generic content card */
.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 22px;box-shadow:var(--shadow);margin:16px 0}
.panel h3{color:var(--navy2);margin-top:0}
.lead-q{background:var(--paleblue2);border:1px solid var(--blue);border-radius:10px;padding:11px 15px;margin:12px 0;font-weight:800;color:var(--navy)}
.kbd{font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:var(--blue)}
.note{background:var(--sdbg);border:1px solid #f0c98a;border-radius:10px;padding:12px 15px;color:#7c4a03;margin:14px 0}
.muted{color:var(--muted)}
.pill{display:inline-block;font-size:.7rem;font-weight:800;padding:3px 9px;border-radius:999px;text-transform:uppercase;letter-spacing:.04em}
.pill.rev{background:var(--revbg);color:var(--rev)}
.pill.sd{background:var(--sdbg);color:var(--sd)}
.pill.tw{background:var(--twbg);color:var(--tw)}

/* strand colour blocks */
.strandcard{border-radius:14px;padding:18px 20px;color:#fff;box-shadow:var(--shadow)}
.strandcard h3{margin:0;color:#fff;font-size:1.25rem}
.strandcard .sub{opacity:.92;font-size:.85rem;font-weight:700;margin-top:2px}
.s-rev{background:linear-gradient(135deg,#7f1d1d,#B91C1C)}
.s-sd{background:linear-gradient(135deg,#7c2d12,#B45309)}
.s-tw{background:linear-gradient(135deg,#155e63,#0e7490)}
.strandcard ul{margin:12px 0 0;padding-left:18px}
.strandcard li{margin:5px 0;font-size:.92rem}

/* comparison grid */
.cmp{width:100%;border-collapse:separate;border-spacing:0;font-size:.9rem;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.cmp th,.cmp td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top;text-align:left}
.cmp thead th{background:var(--navy2);color:#fff;font-size:.82rem}
.cmp tbody th{background:var(--paleblue);color:var(--navy);width:135px;font-weight:800}
.cmp td.r{background:#fff}
.cmp tr:last-child td,.cmp tr:last-child th{border-bottom:0}
.cmp .h-rev{background:#7f1d1d}.cmp .h-sd{background:#7c2d12}.cmp .h-tw{background:#155e63}
.scroll-x{overflow-x:auto}

/* accordion */
.acc{border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:10px 0;background:#fff}
.acc>summary{cursor:pointer;list-style:none;padding:13px 16px;font-weight:800;color:var(--navy2);display:flex;align-items:center;gap:10px}
.acc>summary::-webkit-details-marker{display:none}
.acc>summary .chev{margin-left:auto;transition:transform .2s}
.acc[open]>summary .chev{transform:rotate(90deg)}
.acc>summary:hover{background:var(--paleblue)}
.acc .body{padding:4px 16px 16px;border-top:1px solid var(--line)}
.acc.rev>summary{border-left:6px solid var(--rev)}
.acc.sd>summary{border-left:6px solid var(--sd)}
.acc.tw>summary{border-left:6px solid var(--tw)}

/* AO tags */
.ao{font-weight:800;font-size:.7rem;padding:2px 6px;border-radius:5px;color:#fff}
.ao1{background:var(--ao1)}.ao2{background:var(--ao2)}.ao3{background:var(--ao3)}
.aoline{border-left:4px solid var(--line);padding:6px 0 6px 12px;margin:8px 0}
.aoline.a1{border-color:var(--ao1)}.aoline.a2{border-color:var(--ao2)}.aoline.a3{border-color:var(--ao3)}

/* ===== canvas pad ===== */
.pad-tools{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin:6px 0 8px}
.pad-sw{display:flex;gap:5px;align-items:center}
.pad-dot{width:20px;height:20px;padding:0;border-radius:50%;border:1px solid #94a3b8;cursor:pointer}
.pad-btn{font:inherit;font-weight:700;font-size:.78rem;padding:6px 10px;border-radius:7px;border:1px solid #cbd5e1;background:#fff;color:var(--navy2);cursor:pointer}
.pad-btn.on{background:var(--navy2);color:#fff;border-color:var(--navy2)}
.pad-size{display:flex;align-items:center;gap:5px;font-size:.76rem;color:var(--muted)}
.pad-size input{width:84px}
.pad-surf{position:relative;width:100%;border:1px solid #cbd5e1;border-radius:12px;overflow:hidden;background:#fff;touch-action:none}
.kind-ruled{background-image:linear-gradient(#e8eef6 1px,transparent 1px);background-size:100% 30px}
.kind-ruled::before{content:"";position:absolute;top:0;bottom:0;left:40px;width:1px;background:#f4cccc;z-index:0}
.kind-grid{background-image:linear-gradient(#e8eef6 1px,transparent 1px),linear-gradient(90deg,#e8eef6 1px,transparent 1px);background-size:28px 28px}
.pad-canvas{position:absolute;inset:0;z-index:3;display:block;cursor:crosshair;touch-action:none}
.pad-bg{position:absolute;inset:0;z-index:1;padding:10px;overflow:hidden}

/* ===== drag-drop exercise ===== */
.legend{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 10px}
.lg{display:inline-flex;align-items:center;gap:6px;font-size:.76rem;font-weight:700;color:#334155}
.sw{width:14px;height:14px;border-radius:4px;border-left:4px solid}
.dd{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:820px){.dd{grid-template-columns:1.1fr .9fr}}
.slots{display:flex;flex-direction:column;gap:8px}
.slot{border:2px dashed #c3d2e3;border-radius:10px;background:#fff;padding:8px 10px;min-height:50px}
.slot .lab{display:block;font-size:.66rem;font-weight:800;text-transform:uppercase;letter-spacing:.04em;color:var(--blue);margin-bottom:4px}
.slot.right{border-style:solid;border-color:#86c98f;background:#DCFCE7}
.slot.wrong{border-style:solid;border-color:#e6a8a8;background:#FEE2E2}
.slot.target{border-color:var(--navy2);background:var(--paleblue)}
.bankwrap{background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 12px;align-self:start}
.bankhead{font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:.04em;color:#64748b;margin-bottom:8px}
.bank{display:flex;flex-direction:column;gap:8px;min-height:40px}
.chip{border:1px solid var(--line);border-left:4px solid #94a3b8;border-radius:8px;background:#fff;padding:8px 11px;font-size:.86rem;cursor:grab;touch-action:none;user-select:none}
.chip:active{cursor:grabbing}
.chip.sel{outline:3px solid var(--navy2);outline-offset:1px}
.t-rev{border-left-color:var(--rev);background:var(--revbg)}
.t-sd{border-left-color:var(--sd);background:var(--sdbg)}
.t-tw{border-left-color:var(--tw);background:var(--twbg)}
.t-ao1{border-left-color:var(--ao1);background:#fef2f2}
.t-ao2{border-left-color:var(--ao2);background:#eff6fc}
.t-ao3{border-left-color:var(--ao3);background:#DCFCE7}
.t-theme{border-left-color:var(--navy2);background:#eef3fb}
.t-point{border-left-color:var(--sd);background:#fffbeb}
.controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:12px}
.score{font-weight:800;color:var(--navy2);margin-left:4px}
.pickbar{position:fixed;left:0;right:0;bottom:0;z-index:9998;background:var(--navy2);color:#fff;padding:9px 12px;display:none;align-items:center;gap:10px;box-shadow:0 -4px 16px rgba(0,0,0,.22)}
.pickbar.show{display:flex}
.pickbar .pb-text{flex:1;font-size:.82rem;max-height:2.6em;overflow:hidden}
.pbbtn{font:inherit;font-weight:700;font-size:.8rem;padding:7px 13px;border-radius:8px;border:1px solid rgba(255,255,255,.4);background:rgba(255,255,255,.12);color:#fff;cursor:pointer}

/* MCQ */
.mcq{margin:14px 0}
.mcq .q{font-weight:800;color:var(--navy);margin-bottom:8px}
.mcq .opt{display:block;width:100%;text-align:left;font:inherit;font-size:.9rem;padding:10px 13px;border:1px solid var(--line);border-radius:9px;background:#fff;margin:6px 0;cursor:pointer}
.mcq .opt:hover{background:var(--paleblue)}
.mcq .opt.correct{background:#DCFCE7;border-color:#86c98f}
.mcq .opt.wrong{background:#FEE2E2;border-color:#e6a8a8}
.mcq .fb{font-size:.85rem;margin-top:6px;display:none}
.mcq .fb.show{display:block}

/* matching pairs (two columns, click to pair) */
.match{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:640px){.match{grid-template-columns:1fr}}
.mcol{display:flex;flex-direction:column;gap:8px}
.mhead{font-size:.7rem;font-weight:800;text-transform:uppercase;color:#64748b}
.mitem{border:1px solid var(--line);border-radius:9px;padding:9px 11px;background:#fff;cursor:pointer;font-size:.88rem}
.mitem.pick{outline:3px solid var(--navy2);outline-offset:1px}
.mitem.done{background:#DCFCE7;border-color:#86c98f;cursor:default}
.mitem .pin{font-size:.68rem;font-weight:800;color:#15803D;margin-left:6px}

/* timeline roller (3D) */
.roller{perspective:1100px;margin:14px 0}
.roller .stage{position:relative;height:150px;border-radius:14px;background:linear-gradient(180deg,#0f172a,#1e293b);overflow:hidden;border:1px solid #0b1220}
.roller .face{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;color:#fff;padding:14px;text-align:center;transition:transform .6s ease,opacity .5s ease;backface-visibility:hidden}
.roller .yr{font-size:2rem;font-weight:800;color:#fcd34d;line-height:1}
.roller .ev{font-size:1rem;font-weight:700;margin-top:6px;max-width:680px}
.roller .dt{font-size:.82rem;color:#cbd5e1;margin-top:4px;max-width:680px}
.roller .rctrl{display:flex;align-items:center;justify-content:center;gap:12px;margin-top:10px}
.roller .rprog{flex:1;height:6px;background:#e2e8f0;border-radius:3px;overflow:hidden;max-width:360px}
.roller .rprog i{display:block;height:100%;background:var(--blue);width:0}
.dotnav{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin-top:8px}
.dotnav b{width:9px;height:9px;border-radius:50%;background:#cbd5e1;cursor:pointer}
.dotnav b.on{background:var(--blue)}

/* collaborate panel */
.collab-panel{position:fixed;right:16px;bottom:16px;z-index:9990;width:300px;max-width:calc(100vw - 32px);background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 20px 50px rgba(0,0,0,.22);display:none}
.collab-panel.show{display:block}
.collab-panel .head{background:var(--navy);color:#fff;padding:11px 14px;border-radius:14px 14px 0 0;font-weight:800;display:flex;align-items:center;gap:8px}
.collab-panel .head .x{margin-left:auto;background:0;border:0;color:#cbd5e1;font-size:1.1rem;cursor:pointer}
.collab-panel .body{padding:14px}
.collab-panel input[type=text]{width:100%;font:inherit;padding:9px 11px;border:1px solid var(--line);border-radius:8px;margin:4px 0 10px}
.collab-panel .who{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.who .av{font-size:.72rem;font-weight:800;color:#fff;padding:3px 9px;border-radius:999px}
.roomcode{font-family:monospace;font-weight:800;font-size:1.1rem;letter-spacing:.12em;color:var(--navy2);background:var(--paleblue);padding:6px 10px;border-radius:8px;display:inline-block}
.hint{font-size:.82rem;color:var(--muted)}

/* footer */
.foot{color:#808080;font-size:.8rem;text-align:center;border-top:1px solid var(--line);margin-top:30px;padding:18px}
.foot a{color:#808080}
.skip{position:absolute;left:-999px}
.print-only{display:none}
@media print{
  .nav,.collab-pill,.collab-panel,.pickbar,.pad-tools,.controls,.btn{display:none!important}
  body{background:#fff}
  .panel,.card{box-shadow:none}
}