/* Free courses: hub, course overview, lesson, quiz and certificate pages. Uses the tokens from stats-studio.css. */
.c-hero { padding-block: 28px 30px; max-width: 820px; }
.c-hero h1 { font-size: clamp(30px, 4.2vw, 46px); letter-spacing: -0.035em; line-height: 1.06; margin-top: 12px; }
.c-hero .lede { margin-top: 18px; max-width: 64ch; }
.c-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.c-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; margin: 8px 0 48px; }
.c-card { border: 1px solid var(--line); border-radius: 16px; background: var(--surface); padding: 22px; display: grid; gap: 10px; align-content: start; text-decoration: none; color: inherit; position: relative; transition: border-color .15s, transform .15s; }
.c-card:hover { border-color: var(--accent-line); transform: translateY(-2px); }
.c-card h2, .c-card h3 { font-size: 19px; letter-spacing: -0.02em; color: var(--ink); }
.c-card p { color: var(--muted); font-size: 14.5px; line-height: 1.55; }
.c-card .c-num { font: 500 12px/1 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.c-card .c-facts { font: 500 12px/1.5 var(--f-mono); color: var(--muted); }
.c-card .c-prog { margin-top: 4px; }
.c-bar { height: 6px; border-radius: 99px; background: var(--sunken); overflow: hidden; }
.c-bar > i { display: block; height: 100%; width: 0; background: var(--grad); border-radius: 99px; transition: width .3s; }
.c-prog-label { font: 500 12px/1 var(--f-mono); color: var(--muted); margin-top: 7px; display: block; }
.c-steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; margin: 8px 0 48px; }
.c-steps > div { background: var(--surface); padding: 20px; display: grid; gap: 6px; align-content: start; }
.c-steps b { font-size: 15.5px; color: var(--ink); }
.c-steps span { color: var(--muted); font-size: 14px; line-height: 1.55; }
.c-steps i { font: 600 13px/1 var(--f-mono); font-style: normal; color: var(--accent); }
.c-section-h { font-size: 24px; letter-spacing: -0.025em; margin: 8px 0 16px; }

/* course overview */
.c-over { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 44px; align-items: start; padding-bottom: 48px; }
.c-enrol { position: sticky; top: 84px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); padding: 22px; display: grid; gap: 12px; }
.c-enrol h2 { font-size: 18px; }
.c-enrol p { font-size: 14px; color: var(--muted); line-height: 1.55; }
.c-enrol label { font-size: 13px; color: var(--ink-2); font-weight: 500; }
.c-enrol input[type=text], .c-enrol input[type=email], .c-input { width: 100%; font: 15px/1.3 var(--f-sans); color: var(--ink); background: var(--bg); border: 1px solid var(--line-2); border-radius: 9px; padding: 10px 12px; }
.c-enrol input:focus, .c-input:focus { outline: none; box-shadow: var(--ring); border-color: var(--accent); }
.c-enrol .btn { width: 100%; }
.c-enrol .c-check { display: flex; gap: 8px; align-items: flex-start; font-size: 13px; color: var(--ink-2); font-weight: 400; }
.c-enrol .c-check input { margin-top: 3px; }
.c-enrol .c-small { font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.c-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.c-list li { display: grid; grid-template-columns: 22px 1fr; gap: 10px; align-items: start; }
.c-list li::before { content: "✓"; color: var(--good); font-weight: 700; }
.c-syl { list-style: none; margin: 0; padding: 0; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.c-syl li + li { border-top: 1px solid var(--line); }
.c-syl a { display: grid; grid-template-columns: 34px 1fr auto; gap: 12px; align-items: start; padding: 14px 16px; text-decoration: none; color: inherit; background: var(--surface); }
.c-syl a:hover { background: var(--sunken); }
.c-syl .n { width: 26px; height: 26px; border-radius: 50%; border: 1.5px solid var(--line-2); display: grid; place-items: center; font: 600 12px/1 var(--f-mono); color: var(--muted); }
.c-syl .done .n { background: var(--good); border-color: var(--good); color: #fff; }
.c-syl .t { font-weight: 600; color: var(--ink); font-size: 15px; }
.c-syl .d { display: block; color: var(--muted); font-size: 13.5px; line-height: 1.5; margin-top: 3px; font-weight: 400; }
.c-syl .m { font: 500 12px/1 var(--f-mono); color: var(--muted); white-space: nowrap; padding-top: 5px; }
.c-tools { display: flex; flex-wrap: wrap; gap: 8px; }
.c-tools a { font-size: 13.5px; padding: 6px 11px; border-radius: 999px; border: 1px solid var(--line); text-decoration: none; color: var(--ink-2); background: var(--surface); }
.c-tools a:hover { border-color: var(--accent-line); color: var(--accent); }

/* lesson */
.c-lesson { display: grid; grid-template-columns: 270px minmax(0, 760px); gap: 48px; align-items: start; padding-bottom: 56px; }
.c-side { position: sticky; top: 84px; max-height: calc(100vh - 100px); overflow: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.c-side-h { padding: 14px 16px; border-bottom: 1px solid var(--line); display: grid; gap: 8px; }
.c-side-h a { font-weight: 600; font-size: 14px; color: var(--ink); text-decoration: none; line-height: 1.35; }
.c-side ol { list-style: none; margin: 0; padding: 6px 0; }
.c-side li a { display: grid; grid-template-columns: 22px 1fr; gap: 8px; padding: 7px 16px; font-size: 13.5px; line-height: 1.4; color: var(--ink-2); text-decoration: none; }
.c-side li a:hover { background: var(--sunken); }
.c-side li a .n { width: 20px; height: 20px; border-radius: 50%; border: 1.5px solid var(--line-2); display: grid; place-items: center; font: 600 10.5px/1 var(--f-mono); color: var(--muted); }
.c-side li.done a .n { background: var(--good); border-color: var(--good); color: #fff; }
.c-side li.cur a { background: var(--accent-soft); color: var(--ink); font-weight: 600; }
.c-side-toggle { display: none; }
.c-art-h { padding: 6px 0 10px; }
.c-art-h h1 { font-size: clamp(28px, 3.6vw, 40px); letter-spacing: -0.03em; line-height: 1.1; margin-top: 12px; }
.c-art-h .lede { margin-top: 14px; }
.c-art .prose { margin-top: 18px; }
.prose ol { padding-left: 22px; margin: 0; display: grid; gap: 6px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 14px; margin: 4px 0; }
.prose th, .prose td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose thead th { border-top: 1.5px solid var(--ink); border-bottom: 1px solid var(--ink); color: var(--ink); font-weight: 600; }
.prose tbody tr:last-child td { border-bottom: 1.5px solid var(--ink); }
.prose .tbl { overflow-x: auto; }
.prose code { font-size: .9em; background: var(--sunken); padding: 1px 5px; border-radius: 5px; }
.prose blockquote { margin: 0; padding: 12px 16px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; color: var(--ink); }
.c-try { border: 1px solid var(--accent-line); background: var(--accent-soft); border-radius: 14px; padding: 18px 20px; display: grid; gap: 10px; }
.c-try .eyebrow { color: var(--accent); }
.c-try h3 { font-size: 17px; color: var(--ink); margin: 0; }
.c-try ol, .c-try ul { padding-left: 20px; margin: 0; display: grid; gap: 5px; font-size: 15px; }
.c-try .c-try-acts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.c-key { border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; background: var(--sunken); display: grid; gap: 8px; }
.c-key h3 { margin: 0; font-size: 15px; }
.c-warn { border-radius: 12px; padding: 12px 16px; background: var(--warn-soft); color: var(--ink); font-size: 15px; }

/* quiz */
.c-quiz { margin-top: 34px; border: 1px solid var(--line); border-radius: 16px; padding: 22px; background: var(--surface); display: grid; gap: 18px; }
.c-quiz > h2 { font-size: 20px; }
.c-quiz > p { color: var(--muted); font-size: 14.5px; margin-top: -10px; }
.cq { display: grid; gap: 8px; }
.cq-t { font-weight: 600; color: var(--ink); font-size: 15.5px; line-height: 1.45; }
.cq-t span { font: 500 12px/1 var(--f-mono); color: var(--muted); margin-right: 6px; }
.cq-o { display: grid; gap: 6px; }
.cq-o button { text-align: left; font: 14.5px/1.45 var(--f-sans); color: var(--ink-2); background: var(--bg); border: 1px solid var(--line-2); border-radius: 10px; padding: 10px 13px; cursor: pointer; }
.cq-o button:hover:not(:disabled) { border-color: var(--accent); }
.cq-o button:disabled { cursor: default; }
.cq-o button.ok { border-color: var(--good); background: var(--good-soft); color: var(--ink); }
.cq-o button.no { border-color: var(--bad); background: var(--bad-soft); color: var(--ink); }
.cq-x { font-size: 14px; line-height: 1.55; color: var(--ink-2); padding: 10px 13px; border-radius: 10px; background: var(--sunken); }
.cq-x b { color: var(--ink); }
.c-score { font-weight: 600; color: var(--ink); }
.c-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 26px; }
.c-done-msg { font-size: 14px; color: var(--good); font-weight: 500; }
.c-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 30px; }
.c-pn a { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; text-decoration: none; color: var(--ink); display: grid; gap: 4px; background: var(--surface); }
.c-pn a:hover { border-color: var(--accent-line); }
.c-pn a span { font: 500 12px/1 var(--f-mono); color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.c-pn a b { font-weight: 600; font-size: 15px; line-height: 1.35; }
.c-pn .nx { text-align: right; grid-column: 2; }

/* certificate */
.c-cert-wrap { padding: 10px 0 56px; display: grid; gap: 18px; justify-items: center; }
.c-cert { width: min(100%, 960px); aspect-ratio: 1.414 / 1; background: #fff; color: #0f1a33; border-radius: 6px; box-shadow: 0 1px 2px rgba(15,26,51,.08), 0 12px 40px rgba(15,26,51,.12); position: relative; padding: 5.5% 7%; display: grid; align-content: space-between; text-align: center; overflow: hidden; }
.c-cert::before { content: ""; position: absolute; inset: 2.2%; border: 1.5px solid #0f1a33; border-radius: 3px; pointer-events: none; }
.c-cert::after { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 1.6%; background: linear-gradient(#1479f0, #6a3df0); }
.c-cert .ct-brand { display: flex; justify-content: center; align-items: center; gap: 10px; font-weight: 700; font-size: clamp(12px, 1.9vw, 19px); letter-spacing: -.01em; }
.c-cert .ct-brand b { background: linear-gradient(90deg, #1479f0, #6a3df0); -webkit-background-clip: text; background-clip: text; color: transparent; }
.c-cert .ct-k { font: 500 clamp(9px, 1.2vw, 13px)/1 var(--f-mono); letter-spacing: .16em; text-transform: uppercase; color: #5b6474; }
.c-cert .ct-name { font-size: clamp(24px, 5vw, 52px); font-weight: 600; letter-spacing: -.03em; line-height: 1.1; margin: 1.5% 0; }
.c-cert .ct-course { font-size: clamp(15px, 2.6vw, 27px); font-weight: 600; letter-spacing: -.02em; line-height: 1.2; }
.c-cert .ct-txt { font-size: clamp(10px, 1.45vw, 15px); color: #384152; line-height: 1.55; max-width: 70ch; margin: 1.5% auto 0; }
.c-cert .ct-foot { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 4%; align-items: end; font-size: clamp(9px, 1.25vw, 13px); color: #384152; }
.c-cert .ct-foot div { border-top: 1px solid #0f1a33; padding-top: 6px; display: grid; gap: 2px; }
.c-cert .ct-foot b { color: #0f1a33; font-size: 1.08em; }
.c-cert-acts { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.c-locked { max-width: 640px; border: 1px solid var(--line); border-radius: 16px; padding: 24px; background: var(--surface); display: grid; gap: 12px; }
.c-locked h2 { font-size: 20px; }
.c-locked ul { margin: 0; padding-left: 20px; display: grid; gap: 4px; color: var(--ink-2); }
.c-faq { display: grid; gap: 10px; max-width: 820px; margin-bottom: 48px; }
.c-faq details { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; background: var(--surface); }
.c-faq summary { cursor: pointer; font-weight: 600; color: var(--ink); }
.c-faq details p { margin-top: 10px; color: var(--ink-2); line-height: 1.65; }
.c-home-cards { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 14px; }
.c-home-cards .c-card { padding: 18px; }
.c-home-cards .c-card h3 { font-size: 16px; }
.c-home-cards .c-card p { font-size: 13.5px; }

@media (max-width: 1100px) { .c-home-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 960px) {
  .c-over { grid-template-columns: 1fr; gap: 28px; }
  .c-enrol { position: static; }
  .c-lesson { grid-template-columns: 1fr; gap: 20px; }
  .c-side { position: static; max-height: none; }
  .c-side ol { display: none; }
  .c-side.open ol { display: block; }
  .c-side-toggle { display: inline-flex; }
  .c-steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .c-steps { grid-template-columns: 1fr; }
  .c-home-cards { grid-template-columns: 1fr; }
  .c-pn { grid-template-columns: 1fr; }
  .c-pn .nx { grid-column: 1; }
  .c-cert { aspect-ratio: auto; min-height: 520px; padding: 9% 8%; gap: 18px; }
  .c-cert .ct-foot { grid-template-columns: 1fr; }
}
@media print {
  body * { visibility: hidden !important; }
  .c-cert, .c-cert * { visibility: visible !important; }
  .c-cert { position: fixed; left: 0; top: 0; width: 100%; box-shadow: none; border-radius: 0; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  @page { size: A4 landscape; margin: 0; }
}
.c-lesson { margin-top: 18px; }

/* ===== student accounts ===== */
.c-acct { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 18px; margin: 14px 0 0; padding: 10px 14px; border: 1px solid var(--line); border-radius: 12px; background: var(--sunken); font-size: 14px; color: var(--ink-2); }
.c-acct b { color: var(--ink); }
.c-acct-links { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; }
.c-linkbtn { background: none; border: 0; padding: 0; font: inherit; color: var(--accent); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.c-modal { position: fixed; inset: 0; z-index: 1000; background: rgba(10, 14, 28, .55); display: grid; place-items: center; padding: 16px; overflow-y: auto; }
.c-modal[hidden] { display: none !important; }
html.c-modal-open { overflow: hidden; }
.c-modal-box { position: relative; width: min(100%, 460px); background: var(--surface); color: var(--ink); border-radius: 16px; border: 1px solid var(--line); box-shadow: 0 20px 60px rgba(0,0,0,.25); padding: 22px 22px 20px; display: grid; gap: 10px; }
.c-modal-box h2 { font-size: 20px; margin-top: 4px; }
.c-modal-why { color: var(--muted); font-size: 14px; line-height: 1.55; }
.c-modal-x { position: absolute; top: 10px; right: 12px; width: 32px; height: 32px; border-radius: 8px; border: 0; background: transparent; color: var(--muted); font-size: 22px; cursor: pointer; }
.c-modal-x:hover { background: var(--sunken); color: var(--ink); }
.c-tabs { display: flex; gap: 4px; padding: 4px; background: var(--sunken); border-radius: 10px; margin-right: 36px; }
.c-tabs button { flex: 1; border: 0; background: transparent; padding: 8px 10px; border-radius: 8px; font: 500 14px/1 var(--f-sans); color: var(--ink-2); cursor: pointer; }
.c-tabs button[aria-selected="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgba(0,0,0,.08); }
.c-form { display: grid; gap: 12px; align-content: start; }
.c-form h2 { font-size: 18px; }
.c-form label { display: grid; gap: 6px; font-size: 13.5px; font-weight: 500; color: var(--ink-2); }
.c-form label.c-check { display: flex; gap: 8px; align-items: flex-start; font-weight: 400; }
.c-form label.c-check input { margin-top: 3px; }
.c-form input:not([type=checkbox]) { width: 100%; font: 15px/1.3 var(--f-sans); color: var(--ink); background: var(--bg); border: 1px solid var(--line-2); border-radius: 9px; padding: 10px 12px; }
.c-form input:focus { outline: none; box-shadow: var(--ring); border-color: var(--accent); }
.c-form .btn.lg { width: 100%; }
.c-form-err { background: var(--bad-soft); color: var(--bad); border-radius: 9px; padding: 9px 12px; font-size: 14px; }
.c-hp { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; overflow: hidden; }
.c-small { font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.c-enrol .btn + .btn { margin-top: -2px; }
.cq-o button.sel { border-color: var(--accent); background: var(--accent-soft); color: var(--ink); box-shadow: inset 0 0 0 1px var(--accent); }
.c-final-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; padding-top: 6px; border-top: 1px solid var(--line); }
.c-name-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 4px; }
.c-name-row label { font-weight: 500; font-size: 14px; width: 100%; }
.c-name-row .c-input { max-width: 360px; }
.c-account { display: grid; gap: 22px; padding-bottom: 56px; max-width: 980px; }
.c-acc-sec { border: 1px solid var(--line); border-radius: 16px; padding: 20px 22px; background: var(--surface); display: grid; gap: 12px; }
.c-acc-sec > h2 { font-size: 20px; }
.c-acc-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
.c-acc-course, .c-acc-cert { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 0; border-top: 1px solid var(--line); }
.c-acc-course > div:first-child { flex: 1; display: grid; gap: 6px; }
.c-acc-course h3 { font-size: 16px; }
.c-acc-course h3 a { color: var(--ink); text-decoration: none; }
.c-acc-course .c-num { font: 500 12px/1 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.c-acc-cert { flex-wrap: wrap; }
.c-acc-cert > div:first-child { display: grid; gap: 4px; }
.c-danger { color: var(--bad); border-color: var(--bad); }
.c-verify-form { display: flex; gap: 10px; max-width: 520px; margin-bottom: 18px; }
.c-verify-form .c-input { font-family: var(--f-mono); letter-spacing: .04em; text-transform: uppercase; }
.c-verify-out { max-width: 720px; }
.c-verify-ok { border: 1px solid var(--line); border-left: 4px solid var(--good); border-radius: 12px; padding: 18px 20px; background: var(--surface); display: grid; gap: 8px; }
.c-verify-ok h2 { font-size: 26px; margin-top: 6px; }
@media (max-width: 760px) { .c-acc-grid { grid-template-columns: 1fr; } .c-acc-course { flex-direction: column; align-items: stretch; } }
@media print { .c-acct, .c-modal { display: none !important; } }
.c-cert .ct-bottom { display: grid; }
.c-cert .ct-note { font-size: clamp(8px, 1.05vw, 11px); color: #5b6474; line-height: 1.55; width: min(100%, 92ch); margin: clamp(10px, 2.4vw, 22px) auto 0; padding-top: clamp(6px, 1.4vw, 12px); border-top: 1px solid #d3d7e0; font-style: italic; }
.c-cert .ct-note span { display: block; }
.c-cert .ct-note span { font-style: normal; color: #384152; }