:root {
    --base: #003dff;
    --error: #ef4444;

    --shade-0: color-mix(in oklch, var(--base), white 100%);
    --shade-50: color-mix(in oklch, var(--base), white 98%);
    --shade-100: color-mix(in oklch, var(--base), white 92%);
    --shade-200: color-mix(in oklch, var(--base), white 80%);
    --shade-300: color-mix(in oklch, var(--base), white 60%);
    --shade-400: color-mix(in oklch, var(--base), white 30%);
    --shade-500: var(--base);
    --shade-700: color-mix(in oklch, var(--base), black 10%);
    --shade-800: color-mix(in oklch, var(--base), black 30%);
    --shade-900: color-mix(in oklch, var(--base), black 75%);
    --shade-1000: color-mix(in oklch, var(--base), black 95%);

    --color-text: var(--shade-1000);
    --color-background: var(--shade-0);
    --color-surface: var(--shade-50);
    --color-tint: var(--shade-100);
    --color-fade: var(--shade-200);
    --color-primary: var(--shade-500);
    --color-secondary: var(--shade-400);
    --color-muted: var(--shade-900);
    --color-contrast: var(--shade-300);
    --color-on-primary: var(--shade-0);
    --color-error: var(--error);
}
@font-face {
    font-family: Manrope;
    src: url('../fonts/manrope.ttf') format('truetype');
    font-weight: 200 800;
    font-display: swap;
}
@font-face {
    font-family: 'IBM Plex Mono';
    src: url('../fonts/ibm-plex-mono.ttf') format('truetype');
    font-weight: 400;
    font-display: swap;
}
:root {
    --font-body: Manrope, system-ui, -apple-system, 'Segoe UI', sans-serif;
    --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
    --max: 1040px;
    --radius: 8px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 120px; }
body { margin: 0; background: var(--color-background); color: var(--color-text); font-family: var(--font-body); font-size: 16px; line-height: 1.7; }
a { color: var(--color-primary); text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
button, input { font: inherit; }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 4px; }
::selection { background: var(--color-primary); color: var(--color-on-primary); }
h1, h2, h3 { text-wrap: balance; }
.shell { width: min(100% - 48px, var(--max)); margin-inline: auto; }
.skip-link { position: absolute; top: -100px; left: 16px; z-index: 30; padding: 10px 16px; background: var(--color-primary); color: var(--color-on-primary); }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 20; background: var(--color-background); border-bottom: 1px solid var(--color-fade); }
.header-inner { display: flex; align-items: center; gap: 28px; min-height: 88px; }
.brand { display: inline-flex; align-items: center; gap: 12px; margin-right: auto; color: inherit; text-decoration: none; }
.brand-logo { width: 38px; height: 38px; }
.brand-copy { display: grid; line-height: 1.25; }
.brand-name { font-size: 1.5rem; font-weight: 800; letter-spacing: -0.05em; }
.brand-tag { margin-top: 4px; font-size: 0.75rem; color: var(--color-muted); }
.site-nav { display: flex; gap: 24px; }
.site-nav a { color: var(--color-text); text-decoration: none; font-size: 0.875rem; }
.site-nav a:hover { color: var(--color-primary); }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 11px 24px; border: 1px solid var(--color-primary); border-radius: var(--radius); font-weight: 700; text-decoration: none; cursor: pointer; transition: background 150ms ease-out, color 150ms ease-out; }
.button-primary { background: var(--color-primary); color: var(--color-on-primary); }
.button-primary:hover { background: var(--color-surface); color: var(--color-primary); }
.button-ghost { background: transparent; color: var(--color-primary); }
.button-ghost:hover { background: var(--color-primary); color: var(--color-on-primary); }
.button:disabled { opacity: 0.6; cursor: wait; }
.hero { padding: 100px 0 80px; }
.eyebrow { font-family: var(--font-mono); font-size: 0.75rem; color: var(--color-secondary); }
.hero h1 { max-width: 850px; margin: 24px 0 0; font-size: clamp(2.5rem, 6vw, 4.7rem); font-weight: 700; line-height: 1.08; letter-spacing: -0.055em; }
.hero-lead { max-width: 720px; margin: 28px 0 0; font-size: 1.125rem; color: var(--color-muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.hero-note { margin: 28px 0 0; font-size: 0.875rem; color: var(--color-muted); }
.facts { background: var(--color-surface); border-block: 1px solid var(--color-fade); }
.facts-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.fact { padding: 28px 20px; border-left: 1px solid var(--color-fade); }
.fact:first-child { border-left: 0; }
.fact strong { display: block; font-size: 1.5rem; font-weight: 700; line-height: 1.2; letter-spacing: -0.035em; }
.fact span { display: block; margin-top: 8px; font-family: var(--font-mono); font-size: 0.7rem; color: var(--color-muted); }
.section.tutor { padding-block: 56px; }
.tutor-inner { display: flex; align-items: center; gap: 36px; }
.tutor-icon { flex: none; width: 96px; height: 96px; color: var(--color-secondary); }
.tutor .section-title { max-width: 760px; }
.section { padding: 80px 0; border-top: 1px solid var(--color-fade); }
.section-head { max-width: 760px; margin-bottom: 40px; }
.section-title { margin: 14px 0 0; font-weight: 700; font-size: clamp(1.8rem, 3.6vw, 2.7rem); line-height: 1.2; letter-spacing: -0.04em; }
.section-lead { margin: 20px 0 0; color: var(--color-muted); }
.audience-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: start; }
.statement { margin: 0; font-weight: 600; font-size: clamp(1.35rem, 2.6vw, 1.8rem); line-height: 1.45; letter-spacing: -0.025em; }
.fit-list { list-style: none; margin: 0; padding: 0; }
.fit-list li { position: relative; padding: 14px 0 14px 26px; border-bottom: 1px solid var(--color-fade); }
.fit-list li::before { content: '✓'; position: absolute; left: 0; color: var(--color-secondary); }
.not-for { margin: 28px 0 0; padding: 22px; background: var(--color-surface); border: 1px solid var(--color-fade); border-radius: var(--radius); font-size: 0.9rem; }
.programme { border-top: 1px solid var(--color-fade); }
.week-row { display: grid; grid-template-columns: 64px 1fr; gap: 20px; padding: 28px 12px; border-bottom: 1px solid var(--color-fade); color: inherit; text-decoration: none; transition: background 150ms ease-out; }
.week-row:hover { background: var(--color-surface); }
.week-row:hover h3 { color: var(--color-primary); }
.week-index { font-family: var(--font-mono); font-size: 1.2rem; color: var(--color-primary); padding-top: 2px; }
.week-row h3 { margin: 0; font-weight: 600; font-size: 1.4rem; line-height: 1.35; letter-spacing: -0.025em; }
.week-row p { margin: 10px 0 0; max-width: 690px; color: var(--color-muted); }
.programme-note { margin: 24px 0 0; }
.band { background: var(--color-tint); }
.band-copy { max-width: 680px; margin: 24px 0 0; font-size: 1.1rem; }
.spec { border-top: 1px solid var(--color-fade); }
.spec-row { display: grid; grid-template-columns: 170px 1fr; gap: 24px; padding: 20px 0; border-bottom: 1px solid var(--color-fade); }
.spec-row dt { padding-top: 4px; font-family: var(--font-mono); font-size: 0.8rem; color: var(--color-muted); }
.spec-row dd { margin: 0; }
.faq { border-top: 1px solid var(--color-fade); }
.faq details { border-bottom: 1px solid var(--color-fade); }
.faq summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 0; cursor: pointer; list-style: none; font-weight: 600; font-size: 1.1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; color: var(--color-primary); font-family: var(--font-mono); font-size: 1.2rem; }
.faq details[open] summary::after { content: '−'; }
.faq .answer { max-width: 720px; padding: 0 0 24px; color: var(--color-muted); }
.register-card { max-width: 660px; padding: 48px; border: 1px solid var(--color-fade); border-top: 3px solid var(--color-primary); border-radius: var(--radius); background: var(--color-surface); }
.register-card h2, .success h2 { margin: 12px 0 0; font-weight: 700; font-size: 2rem; line-height: 1.25; letter-spacing: -0.04em; }
.register-copy { margin: 18px 0 0; color: var(--color-muted); }
.register-form { margin-top: 28px; }
.field { display: grid; gap: 8px; }
.field label, .field-label { font-size: 0.875rem; font-weight: 600; }
.field input { width: 100%; min-height: 52px; padding: 12px 14px; color: var(--color-text); background: var(--color-background); border: 1px solid var(--color-muted); border-radius: var(--radius); }
.field input:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.field .field-error { min-height: 1.3em; font-size: 0.85rem; color: var(--color-error); }
.input-validation-error { border-color: var(--color-error); }
.validation-summary-errors { margin: 0 0 16px; padding: 14px 16px; border: 1px solid var(--color-error); color: var(--color-error); font-size: 0.9rem; }
.validation-summary-valid { display: none; }
.register-form .button { width: 100%; margin-top: 20px; }
.cf-turnstile { margin-top: 20px; }
.form-note { margin: 16px 0 0; font-size: 0.8rem; color: var(--color-muted); }
.keep-in-touch { padding-block: 56px; }
.keep-in-touch-content { max-width: 560px; }
.keep-in-touch-form { margin-top: 24px; }
.keep-in-touch-form .register-form { margin: 0; }
.keep-in-touch-form .field-error:empty { display: none; }
.keep-in-touch-form .cf-turnstile { margin-top: 16px; }
.keep-in-touch-form .button { width: auto; }
.keep-in-touch-form .form-note { margin-top: 12px; }
.keep-in-touch-form .success h3 { margin: 0; font-size: 1.4rem; }
.success-mark { width: 56px; height: 56px; display: grid; place-items: center; margin-bottom: 24px; border: 1px solid var(--color-secondary); border-radius: var(--radius); color: var(--color-secondary); font-size: 1.5rem; }
.success p { margin: 18px 0 0; }
.page-head { padding: 80px 0 56px; }
.page-head h1 { max-width: 800px; margin: 20px 0 0; font-weight: 700; font-size: clamp(2.4rem, 5vw, 3.8rem); line-height: 1.15; letter-spacing: -0.045em; }
.page-head .lead { max-width: 740px; margin: 24px 0 0; font-size: 1.1rem; color: var(--color-muted); }
.page-head .tagline { margin-top: 28px; padding-left: 20px; border-left: 3px solid var(--color-primary); font-size: clamp(1.3rem, 2.4vw, 1.6rem); font-weight: 600; line-height: 1.4; letter-spacing: -0.02em; color: var(--color-text); }
mark { padding: 0 2px; background: linear-gradient(transparent 55%, var(--color-fade) 55%); color: inherit; }
.format-list { columns: 2; column-gap: 48px; margin: 0; padding: 0; list-style: none; }
.format-list li { break-inside: avoid; padding: 12px 0; border-bottom: 1px solid var(--color-fade); }
.format-list.single { columns: 1; max-width: 740px; }
.schedule { max-width: 740px; margin: 0 0 40px; padding: 0; list-style: none; }
.schedule li { display: grid; grid-template-columns: 130px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--color-fade); }
.schedule span { font-family: var(--font-mono); font-size: 0.85rem; color: var(--color-secondary); padding-top: 2px; }
.week { padding: 64px 0; border-top: 1px solid var(--color-fade); }
.week-head { display: flex; flex-direction: column; align-items: start; gap: 16px; }
.week h2 { margin: 0; font-weight: 700; font-size: clamp(1.8rem, 3.4vw, 2.4rem); line-height: 1.25; letter-spacing: -0.035em; }
.week-body { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin-top: 32px; }
.week-block { padding: 24px; background: var(--color-surface); border: 1px solid var(--color-fade); border-radius: var(--radius); }
.week-block h3 { margin: 0 0 12px; font-family: var(--font-mono); font-size: 0.8rem; font-weight: 400; color: var(--color-secondary); }
.week-block ul { margin: 0; padding-left: 18px; }
.week-block li { margin: 6px 0; }
.week-block.wide { grid-column: 1 / -1; }
.week-intro { max-width: 740px; margin: 20px 0 0; color: var(--color-muted); }
.week-note { margin-top: 28px; padding: 20px 24px; border-left: 2px solid var(--color-secondary); background: var(--color-tint); font-size: 0.95rem; }
.principles { counter-reset: principle; list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--color-fade); }
.principles li { counter-increment: principle; display: grid; grid-template-columns: 48px 1fr; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--color-fade); }
.principles li::before { content: '0' counter(principle); font-family: var(--font-mono); color: var(--color-primary); }
.cta-band .band-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-band h2 { margin: 0; max-width: 650px; font-weight: 700; font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.25; letter-spacing: -0.035em; }
.interest-form { width: 100%; max-width: 420px; margin-top: 32px; }
.cta-band .interest-form { margin-top: 0; }
.closed-notice { max-width: 650px; margin-top: 32px; }
.cta-band .closed-notice { margin-top: 0; }
.site-footer { border-top: 1px solid var(--color-fade); padding: 32px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-brand { display: flex; align-items: center; gap: 12px; font-size: 0.875rem; }
.footer-brand img { width: 30px; height: 30px; }
.footer-links { display: flex; gap: 22px; font-size: 0.875rem; }
.footer-links a { color: var(--color-muted); }
.footer-legal { flex-basis: 100%; margin: 0; font-size: 0.8125rem; color: var(--color-muted); }
.inline-form { display: inline; margin: 0; }
.link-button { padding: 0; border: 0; background: none; color: var(--color-muted); font: inherit; text-decoration: underline; cursor: pointer; }
.card-title { margin: 12px 0 0; font-weight: 700; font-size: 2rem; line-height: 1.25; letter-spacing: -0.04em; }
.notice { color: var(--color-text); }
.resend-form { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--color-fade); }
.booking-spec { margin-top: 28px; }
.booking-spec .spec-row { grid-template-columns: 110px 1fr; }
.session-dates { margin: 0; padding: 0; list-style: none; }
.session-dates li { padding: 2px 0; }
.register-card .success { margin-top: 24px; }
.page-head .hero-actions { margin-top: 32px; }
.checkout-step { margin: 36px 0 0; font-weight: 700; font-size: 1.35rem; letter-spacing: -0.03em; }
.price strong { font-size: 1.25rem; }
.price .form-note { display: block; margin-top: 4px; }
.promo-note { margin: 8px 0 0; font-size: 0.85rem; color: var(--color-muted); }
.promo-applied { color: var(--color-text); }
.field input[readonly] { color: var(--color-muted); background: var(--color-surface); }
.register-form .field + .field { margin-top: 16px; }
.account-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: start; }
.courses-list .checkout-step:first-child { margin-top: 0; }
.enrollments { margin: 16px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--color-fade); }
.enrollment { display: grid; gap: 4px; padding: 16px 0; border-bottom: 1px solid var(--color-fade); }
.enrollment span { font-size: 0.9rem; color: var(--color-muted); }
@media (max-width: 860px) {
    .site-nav { gap: 14px; }
    .header-inner { gap: 20px; }
    .facts-grid { grid-template-columns: repeat(2, 1fr); }
    .fact { border-left: 0; border-top: 1px solid var(--color-fade); }
    .fact:nth-child(-n + 2) { border-top: 0; }
    .fact:nth-child(even) { border-left: 1px solid var(--color-fade); }
    .audience-grid, .week-body, .account-grid { grid-template-columns: 1fr; }
    .format-list { columns: 1; }
}
@media (max-width: 720px) {
    html { scroll-padding-top: 160px; }
    .shell { width: min(100% - 32px, var(--max)); }
    .header-inner { flex-wrap: wrap; gap: 12px; padding-block: 14px; }
    .header-inner > .button { padding-inline: 16px; }
    .site-nav { order: 3; width: 100%; justify-content: space-between; gap: 8px; padding-top: 8px; }
    .site-nav a { font-size: 0.8rem; }
    .hero, .page-head { padding: 52px 0; }
    .section { padding: 56px 0; }
    .spec-row { grid-template-columns: 1fr; gap: 4px; }
    .booking-spec .spec-row { grid-template-columns: 1fr; }
    .register-card { padding: 32px 24px; }
    .tutor-inner { flex-direction: column; align-items: flex-start; gap: 20px; }
    .tutor-icon { width: 72px; height: 72px; }
    .footer-links { flex-wrap: wrap; gap: 12px 22px; }
    .week-row { grid-template-columns: 32px 1fr; gap: 12px; }
    .week-block { padding: 20px; }
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { transition: none !important; }
}