/* Lantern Tutor. Same tokens as the Lantern home (1c colours, Plus Jakarta Sans). */
@font-face{font-family:"Jakarta";src:url(fonts/jakarta-400.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Jakarta";src:url(fonts/jakarta-600.woff2) format("woff2");font-weight:600;font-display:swap}
:root{--bg:#F6F3EF;--ink:#1F1E26;--soft:#5E5C68;--line:rgba(31,30,38,.16);--acc:#6B5B95;--acc-h:#5B4C83;--card:#fff;
  --lilac:#E7E2F3;--sage:#DDE8DF;--peach:#F4E3DC;--sky:#DCE7F0;--sand:#F3EBD3;--warn:#8a4b00;--warn-bg:#fbeedd}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 "Jakarta",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--acc)}a:hover{color:var(--acc-h)}
h1,h2,h3{margin:0;font-weight:600;letter-spacing:-.02em;line-height:1.15}
h1{font-size:36px}h2{font-size:24px}h3{font-size:18px}
p{margin:0}
.wrap{max-width:1040px;margin:0 auto;padding:0 24px}
.top{border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:16px;min-height:68px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:19px;color:var(--ink);text-decoration:none}
.dot{width:11px;height:11px;border-radius:50%;background:conic-gradient(from 200deg,#fff,#b9b3c9,#fff,#8e86a6,#e6e1f2,#fff);box-shadow:inset 0 0 0 1px rgba(31,30,38,.2)}
.top nav{display:flex;gap:18px;flex:1;flex-wrap:wrap}
.top nav a{color:var(--soft);text-decoration:none;padding:10px 0}
.top nav a:hover{color:var(--ink)}
.who{color:var(--soft);font-size:14px}
main{padding:32px 0 64px}
.stack{display:flex;flex-direction:column;gap:16px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.box{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:22px;display:flex;flex-direction:column;gap:12px}
.tile{border-radius:20px;padding:22px;display:flex;flex-direction:column;gap:8px;text-decoration:none;color:var(--ink);background:var(--c,var(--lilac));min-height:130px}
.tile:hover{transform:translateY(-2px)}
.tile.off{opacity:.55;pointer-events:none}
.kick{font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--soft)}
.soft{color:var(--soft)}.small{font-size:13px}
.btn,button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 20px;border-radius:999px;border:0;
  background:var(--acc);color:#fff;font:600 15px "Jakarta",system-ui,sans-serif;cursor:pointer;text-decoration:none}
.btn:hover,button:hover{background:var(--acc-h);color:#fff}
.ghost{background:transparent;color:var(--ink);border:1px solid rgba(31,30,38,.3)}
.ghost:hover{background:transparent;color:var(--ink);border-color:var(--ink)}
.link{background:none;color:var(--acc);padding:0;min-height:0;font-weight:500}
.link:hover{background:none;color:var(--acc-h)}
form.inline{display:inline}
label{font-weight:600;font-size:14px;display:flex;flex-direction:column;gap:6px}
label.check{flex-direction:row;align-items:flex-start;gap:10px;font-weight:400}
input[type=text],input[type=email],input[type=password],select,textarea{font:16px "Jakarta",system-ui,sans-serif;padding:11px 14px;border:1px solid rgba(31,30,38,.3);
  border-radius:12px;background:#fff;color:var(--ink);min-height:44px;width:100%}
textarea{min-height:160px;resize:vertical}
input[type=checkbox]{width:20px;height:20px;margin-top:2px;accent-color:var(--acc)}
:focus-visible{outline:2px solid var(--acc);outline-offset:2px}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.flash{background:var(--sky);border-radius:14px;padding:12px 16px}
.error{background:var(--warn-bg);color:var(--warn);border-radius:14px;padding:12px 16px}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--soft)}
.scroll{overflow-x:auto}
code,.mono{font:13px ui-monospace,Menlo,monospace;word-break:break-all}
.chat{display:flex;flex-direction:column;gap:12px}
.msg{max-width:78%;padding:14px 16px;border-radius:18px;white-space:pre-wrap;overflow-wrap:anywhere}
.msg.user{align-self:flex-end;background:var(--acc);color:#fff;border-bottom-right-radius:6px}
.msg.assistant{align-self:flex-start;background:#fff;border:1px solid var(--line);border-bottom-left-radius:6px}
.q{white-space:pre-wrap;background:var(--sand);border-radius:16px;padding:16px}
.pill{display:inline-block;font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;background:var(--lilac)}
.pill.warn{background:var(--warn-bg);color:var(--warn)}
details summary{cursor:pointer;color:var(--acc)}
@media (max-width:640px){.wrap{padding:0 16px}.top nav{order:3;flex:1 1 100%;gap:20px}.top .wrap{padding-top:8px;padding-bottom:4px}h1{font-size:28px}.msg{max-width:92%}}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
/* IGCSE lessons: MathML is native; figures are inline SVG from the lesson source */
.lesson{gap:10px}.lesson h2{font-size:22px}
.steps{display:flex;flex-direction:column;gap:10px;padding-left:22px;margin:0}
.steps li{padding-left:4px}
.eq{margin:8px 0;overflow-x:auto}
math{font-size:1.08em}
.fig{margin:12px 0;display:flex;flex-direction:column;gap:6px}.fig svg{max-width:100%;height:auto}
.fig figcaption{font-size:13px;color:var(--soft)}
.fig--pending{border:1px dashed var(--line);border-radius:12px;padding:12px}.fig__kind{font-size:12px;font-weight:600;color:var(--soft)}
.we{border-top:1px solid var(--line);padding-top:12px;display:flex;flex-direction:column;gap:8px}
.part{padding-left:12px;border-left:3px solid var(--lilac);display:flex;flex-direction:column;gap:6px}
dl{margin:0}dd{margin:0 0 10px}