/* =================================================================
   css/marketing.css — the shared homepage / landing layout for every
   site in the family (IB, A Level, IGCSE, CBSE).

   One structure, one look:
     hero → proof → features (tiles) → how it works → pricing teaser
     → founder → FAQ → closing CTA
   Each site's homepage uses these `mk-` classes with its own words.
   Colours, type and spacing come from css/tokens.css (load it first);
   nothing here is site-specific. A-Level gets this file at build time
   as /alevel-frontend/css/marketing.css (sites/alevel/shared.manifest).

   Rules: `mk-` classes only, no element selectors outside `.mk`,
   no web fonts, no images required (the founder photo is optional
   and lazy-loaded by the page).
   ================================================================= */

.mk { font-family: var(--ibm-font); color: var(--ibm-ink); line-height: 1.55; }
.mk *, .mk *::before, .mk *::after { box-sizing: border-box; }
.mk a { color: var(--ibm-primary); }
.mk h1, .mk h2, .mk h3 { color: var(--ibm-dark); letter-spacing: -0.02em; margin: 0; }
.mk-wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.mk-section { padding: 64px 0; }
.mk-section--alt { background: var(--ibm-surface-2); border-top: 1px solid var(--ibm-line); border-bottom: 1px solid var(--ibm-line); }
.mk-section--tight { padding: 40px 0; }

/* Section heading: eyebrow, h2, one-line lede */
.mk-head { max-width: 680px; margin: 0 0 32px; }
.mk-head--center { text-align: center; margin-left: auto; margin-right: auto; }
.mk-eyebrow { display: block; font-size: var(--ibm-text-xs); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--ibm-primary); margin: 0 0 10px; }
.mk-h2 { font-size: clamp(1.5rem, 3vw, 2rem); line-height: 1.2; text-wrap: balance; }
.mk-lede { color: var(--ibm-ink-2); font-size: 1.05rem; margin: 12px 0 0; }

/* Buttons */
.mk-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 12px 22px; border-radius: var(--ibm-r); font: 700 1rem/1.2 var(--ibm-font); text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: background .12s ease, border-color .12s ease; }
.mk-btn--primary { background: var(--ibm-primary); color: #fff !important; }
.mk-btn--primary:hover { background: var(--ibm-primary-hover); }
.mk-btn--secondary { background: var(--ibm-surface); color: var(--ibm-primary); border-color: var(--ibm-line-strong); }
.mk-btn--secondary:hover { border-color: var(--ibm-primary); background: var(--ibm-primary-soft); }
.mk-btn--light { background: #fff; color: var(--ibm-dark) !important; }
.mk-btn--light:hover { background: var(--ibm-primary-soft); }
.mk-btn:focus-visible { outline: none; box-shadow: var(--ibm-focus); }
.mk-link { font-weight: 700; text-decoration: none; }
.mk-link:hover { text-decoration: underline; }

/* ---------- 1. Hero ---------- */
.mk-hero { padding: 56px 0 48px; background: linear-gradient(180deg, var(--ibm-surface-2) 0%, var(--ibm-surface) 100%); }
.mk-hero__grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 48px; align-items: center; }
.mk-hero__kicker { display: inline-block; font-size: var(--ibm-text-xs); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--ibm-primary); background: var(--ibm-primary-soft); border-radius: var(--ibm-r-pill); padding: 6px 12px; margin: 0 0 18px; }
.mk-hero h1 { font-size: clamp(2.1rem, 4.6vw, 3.25rem); line-height: 1.06; letter-spacing: -0.035em; margin: 0 0 16px; text-wrap: balance; }
.mk-hero__sub { font-size: 1.15rem; color: var(--ibm-ink-2); margin: 0 0 28px; max-width: 34em; }
.mk-hero__ctas { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin: 0 0 22px; }
.mk-hero__trust { display: flex; flex-wrap: wrap; gap: 6px 18px; list-style: none; padding: 0; margin: 0; font-size: var(--ibm-text-sm); color: var(--ibm-ink-2); }
.mk-hero__trust li { display: inline-flex; align-items: center; gap: 6px; }
.mk-hero__trust li::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--ibm-green); flex: none; }

/* Product preview card (a marked answer, drawn in HTML — no image) */
.mk-demo { background: var(--ibm-surface); border: 1px solid var(--ibm-line); border-radius: 16px; box-shadow: 0 24px 48px rgba(6,37,89,.12); overflow: hidden; }
.mk-demo__top { display: flex; justify-content: space-between; gap: 8px; background: var(--ibm-dark); color: #dfe7f3; padding: 10px 16px; font-size: var(--ibm-text-xs); font-weight: 700; }
.mk-demo__q { padding: 16px 18px 4px; font-size: .95rem; }
.mk-demo__tag { display: block; font-size: .68rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--ibm-primary); margin-bottom: 6px; }
.mk-demo__ms { margin: 8px 18px 0; border-top: 1px dashed var(--ibm-line-strong); padding-top: 6px; font-family: "Cambria Math", "STIX Two Math", "Times New Roman", serif; }
.mk-demo__ms div { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 5px 0; font-size: 1rem; }
.mk-demo__ms i { font: 800 .72rem/1 ui-monospace, Menlo, monospace; font-style: normal; background: var(--ibm-primary-soft); color: var(--ibm-primary); border-radius: 4px; padding: 3px 6px; }
.mk-demo__score { display: flex; justify-content: space-between; margin: 12px 18px 0; padding: 10px 12px; background: var(--ibm-green-soft); border-radius: 10px; color: var(--ibm-green); font-size: var(--ibm-text-sm); font-weight: 800; }
.mk-demo__foot { display: flex; flex-wrap: wrap; gap: 8px; padding: 14px 18px 18px; }
.mk-demo__chip { font-size: var(--ibm-text-xs); font-weight: 700; border-radius: var(--ibm-r-pill); padding: 6px 11px; background: var(--ibm-surface-2); border: 1px solid var(--ibm-line); color: var(--ibm-dark); }

/* ---------- 2. Proof strip (real numbers only) ---------- */
.mk-proof { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border: 1px solid var(--ibm-line); border-radius: var(--ibm-r-card); background: var(--ibm-surface); }
.mk-proof__item { padding: 20px 22px; border-left: 1px solid var(--ibm-line); }
.mk-proof__item:first-child { border-left: 0; }
.mk-proof__num { display: block; font-size: 1.6rem; font-weight: 800; color: var(--ibm-dark); letter-spacing: -0.02em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.mk-proof__label { display: block; font-size: var(--ibm-text-sm); color: var(--ibm-ink-2); margin-top: 6px; line-height: 1.4; }

/* ---------- 3. Feature tiles ---------- */
.mk-tiles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.mk-tiles--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.mk-tiles--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.mk-tile { display: flex; flex-direction: column; gap: 8px; min-width: 0; background: var(--ibm-surface); border: 1px solid var(--ibm-line); border-radius: var(--ibm-r-card); padding: 22px; color: var(--ibm-ink); text-decoration: none; transition: border-color .12s ease, box-shadow .12s ease, transform .12s ease; }
a.mk-tile:hover { border-color: var(--ibm-line-strong); box-shadow: var(--ibm-shadow-lift); transform: translateY(-1px); }
.mk-tile__icon { width: 40px; height: 40px; border-radius: 10px; background: var(--ibm-primary-soft); color: var(--ibm-primary); display: flex; align-items: center; justify-content: center; flex: none; margin-bottom: 4px; }
.mk-tile__icon svg { width: 22px; height: 22px; }
.mk-tile__tag { align-self: flex-start; font-size: .68rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--ibm-muted); background: var(--ibm-surface-2); border-radius: var(--ibm-r-pill); padding: 3px 8px; }
.mk-tile h3 { font-size: 1.08rem; line-height: 1.3; }
.mk-tile p { margin: 0; color: var(--ibm-ink-2); font-size: .94rem; }
.mk-tile__cta { margin-top: auto; padding-top: 6px; font-weight: 700; font-size: var(--ibm-text-sm); color: var(--ibm-primary); }
.mk-tile--dark { background: var(--ibm-dark); border-color: var(--ibm-dark); }
.mk-tile--dark h3, .mk-tile--dark .mk-tile__cta { color: #fff; }
.mk-tile--dark p { color: #c9d6ee; }
.mk-tile--dark .mk-tile__icon { background: rgba(255,255,255,.1); color: var(--ibm-accent); }

/* Course / unit picker tiles (compact) */
.mk-courses { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.mk-courses--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.mk-course { position: relative; display: flex; flex-direction: column; gap: 4px; background: var(--ibm-surface); border: 1px solid var(--ibm-line); border-radius: var(--ibm-r-card); padding: 16px 18px; text-decoration: none; color: var(--ibm-ink); transition: border-color .12s ease, box-shadow .12s ease; }
.mk-course:hover { border-color: var(--ibm-primary); box-shadow: var(--ibm-shadow-lift); }
.mk-course__code { font-size: 1.15rem; font-weight: 800; color: var(--ibm-dark); letter-spacing: -0.01em; }
.mk-course__name { font-size: var(--ibm-text-sm); color: var(--ibm-ink-2); line-height: 1.35; }
.mk-course__meta { font-size: var(--ibm-text-xs); color: var(--ibm-muted); margin-top: 4px; }
.mk-course__owned { display: none; position: absolute; top: 12px; right: 12px; font-size: .68rem; font-weight: 800; color: var(--ibm-green); background: var(--ibm-green-soft); border-radius: var(--ibm-r-pill); padding: 2px 8px; }
.mk-course.owned .mk-course__owned { display: inline-block; }

/* ---------- 4. How it works ---------- */
.mk-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; list-style: none; padding: 0; margin: 0; counter-reset: mkstep; }
.mk-step { position: relative; padding: 22px; border-radius: var(--ibm-r-card); background: var(--ibm-surface); border: 1px solid var(--ibm-line); counter-increment: mkstep; }
.mk-step::before { content: counter(mkstep); display: flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 50%; background: var(--ibm-dark); color: #fff; font-weight: 800; margin-bottom: 12px; }
.mk-step h3 { font-size: 1.05rem; margin-bottom: 6px; }
.mk-step p { margin: 0; color: var(--ibm-ink-2); font-size: .94rem; }
.mk-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.mk-chip { display: inline-flex; align-items: center; min-height: 36px; padding: 6px 12px; border-radius: var(--ibm-r-pill); border: 1px solid var(--ibm-line-strong); background: var(--ibm-surface); color: var(--ibm-dark); font-weight: 700; font-size: var(--ibm-text-sm); text-decoration: none; }
.mk-chip:hover { border-color: var(--ibm-primary); background: var(--ibm-primary-soft); }

/* ---------- 5. Pricing teaser ---------- */
.mk-plans { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; align-items: stretch; }
.mk-plan { position: relative; display: flex; flex-direction: column; gap: 10px; background: var(--ibm-surface); border: 1px solid var(--ibm-line); border-radius: 14px; padding: 24px; }
.mk-plan--featured { border: 2px solid var(--ibm-primary); box-shadow: 0 16px 36px rgba(6,37,89,.12); }
.mk-plan__badge { position: absolute; top: -12px; left: 22px; background: var(--ibm-primary); color: #fff; font-size: .7rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; border-radius: var(--ibm-r-pill); padding: 4px 10px; }
.mk-plan h3 { font-size: 1.15rem; }
.mk-plan__for { margin: 0; color: var(--ibm-ink-2); font-size: .9rem; }
.mk-plan__price { display: flex; align-items: baseline; gap: 6px; color: var(--ibm-dark); }
.mk-plan__price b { font-size: 2.1rem; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.mk-plan__price span { color: var(--ibm-muted); font-size: .9rem; }
.mk-plan ul { list-style: none; padding: 0; margin: 0 0 6px; display: grid; gap: 8px; align-content: start; font-size: .92rem; flex: 1; }
.mk-plan li { display: flex; gap: 8px; align-items: flex-start; }
.mk-plan li::before { content: '✓'; color: var(--ibm-green); font-weight: 800; flex: none; }
.mk-plan .mk-btn { width: 100%; }
.mk-fine { text-align: center; color: var(--ibm-ink-2); font-size: var(--ibm-text-sm); margin: 20px auto 0; max-width: 60em; }
.mk-fine span { display: inline; }

/* ---------- 6. Founder ---------- */
.mk-founder { display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: 32px; align-items: start; }
.mk-founder__photo { width: 160px; height: 200px; object-fit: cover; border-radius: var(--ibm-r-card); background: var(--ibm-surface-2); display: block; }
.mk-founder blockquote { margin: 0 0 16px; font-size: 1.2rem; line-height: 1.5; color: var(--ibm-dark); font-weight: 600; letter-spacing: -0.01em; }
.mk-founder__name { font-weight: 800; color: var(--ibm-dark); }
.mk-founder__creds { list-style: none; padding: 0; margin: 10px 0 16px; display: grid; gap: 6px; color: var(--ibm-ink-2); font-size: .94rem; }
.mk-founder__creds li { display: flex; gap: 8px; }
.mk-founder__creds li::before { content: '—'; color: var(--ibm-muted); flex: none; }

/* ---------- 7. FAQ ---------- */
.mk-faq { max-width: 780px; margin: 0 auto; }
.mk-faq details { border-bottom: 1px solid var(--ibm-line); }
.mk-faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 16px; padding: 18px 0; font-weight: 700; color: var(--ibm-dark); font-size: 1.02rem; }
.mk-faq summary::-webkit-details-marker { display: none; }
.mk-faq summary::after { content: '+'; color: var(--ibm-primary); font-weight: 700; font-size: 1.3rem; line-height: 1; flex: none; }
.mk-faq details[open] summary::after { content: '−'; }
.mk-faq details p { margin: 0 0 18px; color: var(--ibm-ink-2); }

/* ---------- 8. Closing CTA band ---------- */
.mk-cta { background: var(--ibm-dark); color: #dbe4f5; padding: 56px 0; text-align: center; }
.mk-cta h2 { color: #fff; font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 10px; text-wrap: balance; }
.mk-cta p { margin: 0 auto 24px; max-width: 36em; }
.mk-cta__note { margin-top: 16px !important; font-size: var(--ibm-text-sm); color: #9fb2d6; }
.mk-cta a:not(.mk-btn) { color: #fff; }

/* Some site stylesheets force heading colours with !important (e.g.
   alevel-light.css); keep headings on dark surfaces white. */
.mk .mk-cta h2, .mk .mk-tile--dark h3 { color: #fff !important; }

/* Small print row under a section (audience links etc.) */
.mk-aside { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 24px; margin-top: 24px; font-size: .95rem; color: var(--ibm-ink-2); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .mk-hero__grid { grid-template-columns: 1fr; gap: 32px; }
  .mk-tiles, .mk-tiles--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mk-courses { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mk-proof { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mk-proof__item:nth-child(3) { border-left: 0; }
  .mk-proof__item:nth-child(n+3) { border-top: 1px solid var(--ibm-line); }
  .mk-plans, .mk-steps { grid-template-columns: 1fr; max-width: 520px; margin-left: auto; margin-right: auto; }
}
@media (max-width: 600px) {
  .mk-section { padding: 44px 0; }
  .mk-wrap { padding: 0 16px; }
  .mk-hero { padding: 32px 0 36px; }
  .mk-hero__sub { font-size: 1.05rem; margin-bottom: 22px; }
  .mk-hero__ctas .mk-btn--primary { width: 100%; }
  .mk-tiles, .mk-tiles--2, .mk-tiles--4, .mk-courses--3 { grid-template-columns: 1fr; }
  .mk-proof__num { font-size: 1.35rem; }
  .mk-proof__item { padding: 16px; }
  .mk-founder { grid-template-columns: 1fr; gap: 18px; }
  .mk-founder__photo { width: 96px; height: 120px; }
  .mk-founder blockquote { font-size: 1.08rem; }
}
@media (prefers-reduced-motion: reduce) {
  .mk-tile, .mk-course, .mk-btn { transition: none; }
  a.mk-tile:hover { transform: none; }
}