/* The free version's locks and offer, and the sign-in buttons, on top of the
   course's own stylesheet. Colours are the course's tokens, so dark mode and
   each unit's accent carry over. */

:root{--person:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 12a5 5 0 1 0 0-10 5 5 0 0 0 0 10zm0 2c-4.4 0-8 2.2-8 5v1a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-1c0-2.8-3.6-5-8-5z'/%3E%3C/svg%3E");--lock:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M7 10V7a5 5 0 0 1 10 0v3h1a2 2 0 0 1 2 2v8a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2v-8a2 2 0 0 1 2-2h1zm2 0h6V7a3 3 0 0 0-6 0v3z'/%3E%3C/svg%3E")}

/* ---------- top bar ---------- */
.acct{display:flex;gap:6px;align-items:center;flex:none}
.acct .btn{white-space:nowrap}
.acct-me{padding-left:5px!important}
.acct-me i{width:22px;height:22px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-style:normal;font-size:.66rem;letter-spacing:.02em}
.acct-n{display:inline-grid;place-items:center;min-width:18px;height:18px;padding:0 5px;border-radius:999px;background:var(--accent-ink);color:var(--accent);font-size:.7rem}
.acct-in i{display:none;width:16px;height:16px;background:currentColor;-webkit-mask:var(--person) center/contain no-repeat;mask:var(--person) center/contain no-repeat}
@media (max-width:760px){ .acct-p,.acct-me span{display:none} .acct-me{padding-right:5px!important} }
/* A phone has room for the logo, the three course links and two small buttons, not the name as well. */
@media (max-width:620px){ .top .brand span{display:none} .acct-in span{display:none} .acct-in i{display:block} .acct-in{padding:5px 7px!important} }
@media (max-width:460px){ .acct .btn.sm{padding:5px 9px} .top .topnav a{padding:6px 8px} }

/* ---------- lock marks ---------- */
[data-locked] .dot{border:0;border-radius:0;width:12px;height:12px;background:var(--muted);-webkit-mask:var(--lock) center/contain no-repeat;mask:var(--lock) center/contain no-repeat}
#nrail [data-locked] .dot{opacity:.75}
.hm td.t button[data-locked] span:last-child::after,.ncardlink.lk .eyebrow::after{content:"";display:inline-block;width:.8em;height:.8em;margin-left:.4em;vertical-align:-.05em;background:currentColor;opacity:.6;-webkit-mask:var(--lock) center/contain no-repeat;mask:var(--lock) center/contain no-repeat}
.hm td.t button[data-locked] span:last-child::after{background:var(--muted)}

/* ---------- home: the offer ---------- */
.offer-in{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,1fr);gap:28px;align-items:stretch;border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:var(--shadow);
  background:radial-gradient(520px 260px at 0% 0%,var(--u1-soft),transparent 70%),radial-gradient(520px 280px at 100% 100%,var(--u9-soft),transparent 70%),var(--panel)}
.offer-copy{display:flex;flex-direction:column;gap:12px;min-width:0}
.offer-copy .eyebrow{color:var(--u1)}
.offer-copy h2{font-size:clamp(1.6rem,3vw,2.3rem);font-weight:800;letter-spacing:-.025em}
.offer-copy>p{margin:0;color:var(--muted);max-width:62ch;font-size:1.02rem}
.offer-list{list-style:none;margin:6px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr));gap:10px 18px}
.offer-list li{display:grid;grid-template-columns:3.4ch minmax(0,1fr);gap:10px;align-items:baseline}
.offer-list b{font-family:var(--f-display);font-weight:800;font-size:1.35rem;letter-spacing:-.02em;color:var(--u1);text-align:right;font-variant-numeric:tabular-nums}
.offer-list li:nth-child(2) b{color:var(--u9)} .offer-list li:nth-child(3) b{color:var(--u10)} .offer-list li:nth-child(4) b{color:var(--u18)} .offer-list li:nth-child(5) b{color:var(--u21)}
.offer-list span{font-size:.94rem}
.offer-buy{display:flex;flex-direction:column;gap:14px;justify-content:center;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px}
.price{display:flex;flex-direction:column;gap:2px}
.price b{font-family:var(--f-display);font-weight:800;font-size:3rem;letter-spacing:-.04em;line-height:1}
.price span{color:var(--muted);font-weight:700}
.offer-terms{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px;font-size:.9rem}
.offer-terms li{display:grid;grid-template-columns:18px minmax(0,1fr);gap:8px}
.offer-terms li::before,.lk-list li::before{content:"";width:16px;height:16px;margin-top:.2em;border-radius:50%;background:var(--ok);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M8 0a8 8 0 1 0 0 16A8 8 0 0 0 8 0zm3.6 5.4-4.3 5.2a.8.8 0 0 1-1.2.1L4.3 8.9a.8.8 0 1 1 1.1-1.1l1.2 1.1 3.7-4.5a.8.8 0 1 1 1.3 1z'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M8 0a8 8 0 1 0 0 16A8 8 0 0 0 8 0zm3.6 5.4-4.3 5.2a.8.8 0 0 1-1.2.1L4.3 8.9a.8.8 0 1 1 1.1-1.1l1.2 1.1 3.7-4.5a.8.8 0 1 1 1.3 1z'/%3E%3C/svg%3E") center/contain no-repeat}
.offer-buy .lk-btns{flex-direction:column;align-items:stretch}
.offer-buy .lk-btns .btn{justify-content:center}
.lk-bumped{margin-bottom:14px}
.lk-bumped a{color:var(--accent);font-weight:700}
.offer-admin{display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center;justify-content:space-between;border:1px solid var(--accent);background:var(--accent-soft);border-radius:14px;padding:12px 16px}
@media (max-width:860px){ .offer-in{grid-template-columns:minmax(0,1fr);padding:20px;gap:20px} }

/* ---------- a locked topic ---------- */
#topic.is-locked #bench,#topic.is-locked #graphs,#topic.is-locked #exam,#topic.is-locked .note,#topic.is-locked #labCard{display:none!important}
#topic:not(.is-locked) #lockBox{display:none}
.lockbox{padding:0;overflow:hidden}
.lk-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);align-items:stretch}
.lk-shot{margin:0;position:relative;background:var(--stage);border-right:1px solid var(--line);min-height:220px}
.lk-shot img{display:block;width:100%;height:100%;object-fit:cover;object-position:center}
.lk-shot figcaption{position:absolute;left:12px;bottom:12px;display:inline-flex;gap:7px;align-items:center;font-size:.78rem;font-weight:700;padding:5px 11px 5px 9px;border-radius:999px;background:color-mix(in srgb,var(--panel) 88%,transparent);border:1px solid var(--line);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.lk-ico{width:12px;height:12px;background:var(--accent);-webkit-mask:var(--lock) center/contain no-repeat;mask:var(--lock) center/contain no-repeat}
.lk-copy{display:flex;flex-direction:column;gap:12px;padding:22px 24px;min-width:0}
.lk-copy .eyebrow{color:var(--accent)}
.lk-copy h2{font-size:clamp(1.3rem,2.2vw,1.7rem);font-weight:800;letter-spacing:-.02em}
.lk-copy>p{margin:0;color:var(--muted)}
.lk-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:7px;font-size:.94rem}
.lk-list li{display:grid;grid-template-columns:18px minmax(0,1fr);gap:8px}
.lk-list li::before{background:var(--accent)}
.lk-btns{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}
.lk-note{margin:0;padding:10px 12px;border-radius:12px;background:var(--accent-soft);font-size:.92rem}
.lk-free{margin:0;font-size:.88rem;color:var(--muted)}
.lk-free a,.lk-up a{color:var(--accent);font-weight:700}
.lk-notes{max-width:760px}
.lk-up{margin:0;font-size:.92rem;color:var(--muted)}
@media (max-width:900px){ .lk-grid{grid-template-columns:minmax(0,1fr)} .lk-shot{border-right:0;border-bottom:1px solid var(--line);min-height:0} .lk-shot img{height:auto;aspect-ratio:708/441} }
@media (max-width:640px){ .lk-copy{padding:18px} }

/* ---------- footer ---------- */
#licence{flex-basis:100%;max-width:none;padding-top:10px;border-top:1px dashed var(--line)}
@media print{ .acct,#offer,#lockBox{display:none!important} }