/* =====================================================================
   RX ACADEMY — Academic monochrome design system
   Palette: black / white / gray only (OKLCH, tinted neutrals)
   Type: Archivo (display/UI) + Spectral (long-form prose)
   ===================================================================== */

:root {
  /* Color — restrained monochrome */
  --paper:    oklch(0.985 0.002 255);
  --paper-2:  oklch(0.963 0.003 255);
  --ink:      oklch(0.17 0.006 265);
  --ink-2:    oklch(0.34 0.005 265);
  --mute:     oklch(0.52 0.004 265);
  --line:     oklch(0.86 0.003 265);
  --line-2:   oklch(0.92 0.002 255);
  --m2-gray:  oklch(0.50 0.005 265); /* dark enough for white day-numbers to pass WCAG AA */

  /* Type */
  --sans: "Archivo", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: "Spectral", Georgia, "Times New Roman", serif;

  /* Fluid type scale */
  --fs-eyebrow: clamp(0.72rem, 0.68rem + 0.18vw, 0.82rem);
  --fs-label:   clamp(0.7rem, 0.66rem + 0.16vw, 0.78rem);
  --fs-body:    clamp(1.02rem, 0.98rem + 0.28vw, 1.18rem);
  --fs-lead:    clamp(1.18rem, 1.06rem + 0.6vw, 1.5rem);
  --fs-h3:      clamp(1.5rem, 1.25rem + 1.1vw, 2.1rem);
  --fs-h2:      clamp(2.1rem, 1.6rem + 2.4vw, 3.6rem);
  --fs-display: clamp(2.6rem, 1.7rem + 4.4vw, 5rem);
  --fs-numeral: clamp(3.4rem, 2rem + 7vw, 8rem);

  /* Spacing */
  --section-y: clamp(4.5rem, 3rem + 7vw, 9rem);
  --gap: clamp(1.5rem, 1rem + 2vw, 3rem);
  --wrap: 1180px;
  --prose: 40rem;

  --radius: 2px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1); /* ease-out-expo-ish */
}

/* ---------- Reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: var(--fs-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }

a { color: inherit; text-decoration: none; }

::selection { background: var(--ink); color: var(--paper); }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  font-family: var(--sans);
  font-size: var(--fs-label);
  z-index: 200;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 0.5rem + 4vw, 4rem);
}

/* ---------- Shared type ---------- */
.eyebrow, .kicker, .section-no, .label, .footer-label,
.term-group-label, .legend, .hero-meta, .fees-h, .terms-h {
  font-family: var(--sans);
}

.eyebrow {
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--mute);
}

h1, h2, h3 { font-family: var(--sans); font-weight: 800; line-height: 1.02; letter-spacing: -0.02em; }

.term-date, .term-price, .fee-row dd, .spec-row dd { font-variant-numeric: tabular-nums; }

/* ---------- Buttons ---------- */
.btn {
  --btn-fg: var(--paper);
  --btn-bg: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--sans);
  font-weight: 600;
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.95em 1.5em;
  border-radius: var(--radius);
  border: 1.5px solid var(--ink);
  background: var(--btn-bg);
  color: var(--btn-fg);
  cursor: pointer;
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease);
  white-space: nowrap;
}
.btn .arrow { transition: transform 0.3s var(--ease); }
.btn:hover .arrow { transform: translateX(0.25em); }

.btn-primary:hover { background: var(--paper); color: var(--ink); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.btn-sm { padding: 0.6em 1em; font-size: 0.72rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklch, var(--paper) 86%, transparent);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}
.site-header.scrolled {
  border-bottom-color: var(--line);
  background: color-mix(in oklch, var(--paper) 94%, transparent);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: clamp(56px, 4vw + 44px, 72px);
}
.brand { display: inline-flex; align-items: center; }
.brand-logo { height: clamp(20px, 1.1vw + 15px, 28px); width: auto; display: block; }

/* ---------- Hero ---------- */
.hero {
  padding-top: clamp(2.5rem, 1rem + 5vw, 5.5rem);
  padding-bottom: var(--section-y);
  border-bottom: 1px solid var(--line);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 1rem + 4vw, 5rem);
  align-items: center;
}
.hero-statement {
  font-size: var(--fs-display);
  line-height: 0.98;
  max-width: 13ch;
  margin-top: 1.2rem;
}
.lead {
  font-family: var(--serif);
  font-size: var(--fs-lead);
  line-height: 1.45;
  color: var(--ink-2);
  max-width: 38ch;
  margin-top: 1.4rem;
}
.hero-actions {
  margin-top: 2.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}
.hero-figure { position: relative; }
.hero-figure img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  filter: grayscale(1) contrast(1.04);
  border: 1px solid var(--line);
}
.hero-figure figcaption {
  font-family: var(--sans);
  font-size: var(--fs-eyebrow);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--mute);
  margin-top: 0.8rem;
}

/* ---------- Sections ---------- */
.section {
  padding-block: var(--section-y);
  border-bottom: 1px solid var(--line);
}
.section-head {
  display: flex;
  align-items: baseline;
  gap: clamp(1rem, 0.5rem + 2vw, 2.5rem);
  margin-bottom: clamp(2rem, 1rem + 3vw, 3.5rem);
}
.section-no {
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--mute);
  padding-top: 0.5em;
  border-top: 2px solid var(--ink);
}
.section-title { font-size: var(--fs-h2); }
.section-intro {
  font-family: var(--serif);
  font-size: var(--fs-lead);
  color: var(--ink-2);
  max-width: 46ch;
  line-height: 1.45;
  margin-bottom: clamp(2.5rem, 1.5rem + 3vw, 4rem);
}

/* ---------- Prose (about) ---------- */
.prose { max-width: var(--prose); }
.prose p { margin-bottom: 1.2em; }
.prose p:last-child { margin-bottom: 0; }
.prose-lead {
  font-size: var(--fs-lead);
  line-height: 1.45;
  color: var(--ink);
  font-weight: 500;
}
.prose p:not(.prose-lead) { color: var(--ink-2); }

/* ---------- Interstitial band ---------- */
.band {
  position: relative;
  border-bottom: 1px solid var(--line);
}
.band-figure { margin: 0; }
.band-figure img {
  width: 100%;
  height: clamp(240px, 38vw, 460px);
  object-fit: cover;
  filter: grayscale(1) contrast(1.03);
}
.band-caption {
  position: absolute;
  inset: auto auto 1.4rem 0;
  width: 100%;
  text-align: center;
  pointer-events: none;
}
.band-caption span {
  font-family: var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  color: var(--paper);
  background: color-mix(in oklch, var(--ink) 72%, transparent);
  padding: 0.6rem 1.1rem;
  backdrop-filter: blur(2px);
}

/* ---------- Modules ---------- */
.module {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 2fr);
  gap: clamp(1rem, 0.5rem + 3vw, 4rem);
  padding-block: clamp(2.5rem, 1.5rem + 3vw, 4.5rem);
  border-top: 1px solid var(--line);
}
.module:first-of-type { border-top: 2px solid var(--ink); }
.module-numeral {
  font-family: var(--sans);
  font-weight: 900;
  font-size: var(--fs-numeral);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: var(--ink);
  position: sticky;
  top: clamp(80px, 10vh, 130px);
  align-self: start;
}
.module-body { max-width: 58ch; }
.module-head { margin-bottom: 1.1rem; }
.kicker {
  font-family: var(--sans);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 600;
  color: var(--mute);
  margin-bottom: 0.4rem;
}
.module-title { font-size: var(--fs-h3); }
.module-desc { color: var(--ink-2); margin-bottom: 1.8rem; }

/* Spec table */
.spec {
  border-top: 1px solid var(--ink);
  margin-bottom: 1.8rem;
}
.spec-row {
  display: grid;
  grid-template-columns: 12rem 1fr;
  gap: 1rem;
  padding-block: 0.85rem;
  border-bottom: 1px solid var(--line);
}
.spec-row dt {
  font-family: var(--sans);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--mute);
}
.spec-row dd {
  font-family: var(--sans);
  font-weight: 500;
  color: var(--ink);
}
.spec-note { color: var(--mute); font-weight: 400; }
.module-note {
  font-size: 0.95rem;
  font-style: italic;
  color: var(--mute);
  margin-bottom: 1.8rem;
  padding-left: 1rem;
  border-left: 2px solid var(--line);
}

/* ---------- Calendar ---------- */
.section-calendar { background: var(--paper-2); }
.legend {
  list-style: none;
  padding: 0;
  margin: 0 0 clamp(1.5rem, 1rem + 1.5vw, 2.5rem);
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--ink-2);
}
.legend li { display: inline-flex; align-items: center; gap: 0.5rem; }
.swatch {
  width: 0.95rem; height: 0.95rem;
  border: 1.5px solid var(--ink);
  display: inline-block;
  flex: none;
}
.swatch.m1 { background: var(--ink); }
.swatch.m2 { background: var(--m2-gray); border-color: var(--m2-gray); }
.swatch.m3 { background: var(--paper); }

/* month grids */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1rem, 0.5rem + 1.5vw, 2rem);
  margin-bottom: clamp(3rem, 2rem + 3vw, 4.5rem);
}
.month-name {
  font-family: var(--sans);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 0.7rem;
  margin-bottom: 0.4rem;
  border-bottom: 2px solid var(--ink);
}
.month-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}
.dow {
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--mute);
  text-align: center;
  padding-block: 0.4rem 0.5rem;
}
.cell {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  padding: 0.3rem 0.35rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--ink-2);
  position: relative;
}
.cell.empty { color: transparent; }
.cell.is-course { font-weight: 700; }
.cell.m1 { background: var(--ink); color: var(--paper); }
.cell.m2 { background: var(--m2-gray); color: var(--paper); }
.cell.m3 { box-shadow: inset 0 0 0 1.5px var(--ink); color: var(--ink); }
.cell .cell-tag {
  position: absolute;
  left: 0.3rem; bottom: 0.25rem;
  font-size: 0.54rem;
  letter-spacing: 0.06em;
  font-weight: 700;
  opacity: 0.85;
}

/* term list */
.terms { max-width: 56rem; }
.terms-h {
  font-size: var(--fs-h3);
  margin-bottom: 1.6rem;
}
.term-group { margin-bottom: 2.4rem; }
.term-group:last-child { margin-bottom: 0; }
.term-group-label {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 0.7rem;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 0.2rem;
}
.term-list { list-style: none; padding: 0; margin: 0; }
.term-row {
  display: grid;
  grid-template-columns: 11rem 1fr auto auto auto;
  align-items: center;
  gap: 1rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--line);
}
.term-date { font-family: var(--sans); font-weight: 700; font-size: 1.02rem; color: var(--ink); }
.term-meta { font-family: var(--sans); font-size: var(--fs-label); color: var(--mute); letter-spacing: 0.04em; }
.term-price { font-family: var(--sans); font-weight: 600; color: var(--ink-2); }
.term-status {
  font-family: var(--sans);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--ink);
  border: 1px solid var(--line);
  padding: 0.25em 0.6em;
  border-radius: 100px;
}

.noscript-note, .cal-fallback {
  font-family: var(--sans);
  font-size: var(--fs-label);
  color: var(--mute);
  margin-bottom: 2rem;
}

/* ---------- Admissions & fees ---------- */
.admissions-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 1rem + 4vw, 5rem);
  align-items: start;
}
.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.4rem;
  padding-block: 1.6rem;
  border-top: 1px solid var(--line);
}
.step:first-child { border-top: 2px solid var(--ink); }
.step-no {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 1.4rem;
  line-height: 1;
  width: 2.6rem; height: 2.6rem;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--ink);
  flex: none;
}
.step-title { font-family: var(--sans); font-size: 1.15rem; font-weight: 700; margin-bottom: 0.35rem; }
.step p { color: var(--ink-2); font-size: 1rem; }

.fees {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(1.6rem, 1rem + 2vw, 2.6rem);
  border-radius: var(--radius);
}
.fees-h {
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: color-mix(in oklch, var(--paper) 70%, transparent);
  margin-bottom: 1.2rem;
}
.fee-table { margin-bottom: 1.4rem; }
.fee-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-block: 0.9rem;
  border-bottom: 1px solid color-mix(in oklch, var(--paper) 22%, transparent);
}
.fee-row dt {
  font-family: var(--sans);
  font-weight: 600;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.fee-row dt span {
  font-size: 0.72rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: color-mix(in oklch, var(--paper) 60%, transparent);
}
.fee-row dd { font-family: var(--sans); font-weight: 700; font-size: 1.3rem; }
.fee-total { border-bottom: none; padding-top: 1.1rem; }
.fee-total dt { justify-content: center; font-size: 1.05rem; text-transform: uppercase; letter-spacing: 0.1em; }
.fee-total dd { font-size: 2rem; }
.fees-fine { font-size: 0.9rem; color: color-mix(in oklch, var(--paper) 72%, transparent); line-height: 1.55; margin-bottom: 1.2rem; }
.fees-links { display: flex; flex-direction: column; gap: 0.6rem; }
.fees-links a {
  font-family: var(--sans);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  color: var(--paper);
  border-bottom: 1px solid color-mix(in oklch, var(--paper) 35%, transparent);
  padding-bottom: 0.2rem;
  width: fit-content;
  transition: border-color 0.2s var(--ease);
}
.fees-links a:hover { border-color: var(--paper); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--paper);
  padding-top: clamp(3rem, 2rem + 3vw, 5rem);
  padding-bottom: 2.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: clamp(1.5rem, 1rem + 2vw, 3rem);
  padding-bottom: clamp(2.5rem, 2rem + 2vw, 4rem);
  border-bottom: 1px solid var(--line);
}
.footer-mark { width: min(100%, 300px); height: auto; margin-bottom: 1rem; }
.footer-tag {
  font-family: var(--sans);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--mute);
  font-weight: 600;
}
.footer-label {
  font-family: var(--sans);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 1rem;
}
.footer-links { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.6rem; }
.footer-links a {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink-2);
  transition: color 0.2s var(--ease);
}
.footer-links a:hover { color: var(--ink); }
.footer-base {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 1.6rem;
  font-family: var(--sans);
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--mute);
}

/* ---------- Scroll-margin for anchors ---------- */
:where(#intro, #about, #programme, #calendar, #admissions, #contact) {
  scroll-margin-top: clamp(70px, 8vw, 90px);
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.12s; }

/* =====================================================================
   Responsive
   ===================================================================== */
@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-figure { order: -1; max-width: 460px; }
  .hero-figure img { aspect-ratio: 16 / 10; }
  .admissions-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .calendar-grid { grid-template-columns: 1fr; max-width: 26rem; }
  .module { grid-template-columns: 1fr; gap: 0.5rem; }
  .module-numeral { position: static; font-size: clamp(3rem, 14vw, 4.5rem); }
  .spec-row { grid-template-columns: 1fr; gap: 0.15rem; padding-block: 0.7rem; }
  .term-row {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "date price"
      "meta status"
      "btn btn";
    gap: 0.5rem 1rem;
  }
  .term-date { grid-area: date; }
  .term-meta { grid-area: meta; }
  .term-price { grid-area: price; text-align: right; }
  .term-status { grid-area: status; justify-self: start; }
  .term-row .btn { grid-area: btn; justify-content: center; margin-top: 0.4rem; }
}

@media (max-width: 420px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn .arrow { transition: none; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}