/* ============================================================
   The British Dental Institute — tbdi.co.uk
   Design system: Bone / Petrol / Copper — refined edition
   Display: Fraunces · Body: Inter
   ============================================================ */

:root {
  --porcelain: #f6f2ea;
  --paper: #fcfaf5;
  --ink: #0f2126;
  --ink-soft: #40535a;
  --ink-faint: #7d8d8c;
  --crimson: #9a5526;          /* copper */
  --crimson-deep: #71401c;
  --copper-tint: #d9a06b;
  --line: #e3dbc9;
  --line-dark: #22383e;
  --radius: 0px;
  --max: 1180px;
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, 'Segoe UI', sans-serif;
  --shadow-soft: 0 18px 50px -18px rgba(15,33,38,0.18);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--ink);
  background: var(--porcelain);
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; display: block; }
a { color: inherit; }
p a, li a { text-underline-offset: 3px; text-decoration-thickness: 1px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 28px; }

/* ---------- Utility label: the copper eyebrow ---------- */
.eyebrow {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--crimson);
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}
.eyebrow::before {
  content: "";
  width: 48px;
  height: 1px;
  background: linear-gradient(90deg, var(--crimson), var(--copper-tint));
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 480;
  line-height: 1.08;
  letter-spacing: -0.012em;
  font-variation-settings: 'opsz' 60;
}
h1 { font-size: clamp(2.6rem, 5.8vw, 4.6rem); }
h2 { font-size: clamp(2rem, 3.8vw, 2.9rem); }
h3 { font-size: 1.38rem; line-height: 1.22; }
h1 em, h2 em { font-style: italic; font-weight: 420; color: var(--crimson); }

.lede { font-size: 1.16rem; line-height: 1.75; color: var(--ink-soft); max-width: 56ch; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246,242,234,0.9);
  backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}
.header-top {
  border-bottom: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}
.header-top .wrap {
  display: flex;
  justify-content: flex-end;
  gap: 30px;
  padding-top: 8px;
  padding-bottom: 8px;
}
.header-top a { text-decoration: none; transition: color .18s; }
.header-top a:hover { color: var(--crimson); }
.header-main .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
  gap: 24px;
}
.logo img { height: 42px; width: auto; }
.nav { display: flex; align-items: center; gap: 34px; }
.nav a {
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink);
  padding-bottom: 5px;
  border-bottom: 1px solid transparent;
  transition: border-color .2s, color .2s;
}
.nav a:hover, .nav a[aria-current="page"] { border-bottom-color: var(--crimson); color: var(--crimson-deep); }
.nav .btn { border-bottom: none; }
.nav-toggle { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 15px 34px;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  transition: background .22s, color .22s, border-color .22s, transform .22s, box-shadow .22s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-1px); }
.btn-solid { background: var(--ink); color: var(--paper); }
.btn-solid:hover { background: var(--crimson-deep); border-color: var(--crimson-deep); box-shadow: var(--shadow-soft); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { border-color: var(--crimson); color: var(--crimson-deep); }
.btn-crimson { background: var(--crimson); border-color: var(--crimson); color: #fff; }
.btn-crimson:hover { background: var(--crimson-deep); border-color: var(--crimson-deep); box-shadow: var(--shadow-soft); }

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

/* ---------- Hero ---------- */
.hero {
  padding: 110px 0 100px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  top: -220px;
  right: -220px;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(217,160,107,0.16), transparent 65%);
  pointer-events: none;
}
.hero .wrap {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 72px;
  align-items: end;
  position: relative;
}
.hero h1 span { font-style: italic; font-weight: 420; color: var(--crimson); }
.hero .lede { margin: 30px 0 42px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-side {
  border-left: 1px solid var(--copper-tint);
  padding-left: 40px;
  display: grid;
  gap: 34px;
}
.hero-stat .num {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 450;
  font-size: 2.6rem;
  line-height: 1;
  display: block;
  color: var(--ink);
}
.hero-stat .cap {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 8px;
  display: block;
}

/* ---------- Sections ---------- */
.section { padding: 104px 0; }
.section-dark { background: linear-gradient(160deg, var(--ink) 0%, #132a30 100%); color: var(--porcelain); }
.section-dark .eyebrow::before { background: linear-gradient(90deg, var(--copper-tint), transparent); }
.section-dark .eyebrow { color: var(--copper-tint); }
.section-dark .lede { color: #b8c2bd; }
.section-head { max-width: 720px; margin-bottom: 64px; }
.section-head .lede { margin-top: 20px; }

/* ---------- Course cards ---------- */
.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.course-card {
  background: var(--paper);
  padding: 40px 34px 34px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 15px;
  transition: background .22s, box-shadow .22s, transform .22s;
  position: relative;
  z-index: 0;
}
.course-card:hover {
  background: #fff;
  box-shadow: var(--shadow-soft);
  transform: translateY(-3px);
  z-index: 1;
}
.course-card:hover h3 { color: var(--crimson-deep); }
.course-card .tag {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--crimson);
}
.course-card h3 { transition: color .2s; }
.course-card p { font-size: 15px; line-height: 1.68; color: var(--ink-soft); flex: 1; }
.course-card .meta {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  display: flex;
  gap: 18px;
  border-top: 1px solid var(--line);
  padding-top: 15px;
}
.course-card.flagship { background: var(--ink); }
.course-card.flagship h3, .course-card.flagship .arrow { color: var(--porcelain); }
.course-card.flagship p { color: #b8c2bd; }
.course-card.flagship .meta { color: #8fa09b; border-top-color: var(--line-dark); }
.course-card.flagship:hover { background: #132a30; }
.course-card.flagship:hover h3 { color: var(--copper-tint); }

/* ---------- Filter bar (courses page) ---------- */
.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.filter-bar button {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  padding: 11px 24px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all .18s;
}
.filter-bar button:hover { border-color: var(--crimson); color: var(--crimson-deep); }
.filter-bar button.active { background: var(--ink); border-color: var(--ink); color: var(--paper); }

/* ---------- Pillars (why TBDI) ---------- */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 52px;
}
.pillar { border-top: 1px solid var(--copper-tint); padding-top: 26px; }
.pillar h3 { margin-bottom: 13px; }
.pillar p { font-size: 15.5px; line-height: 1.7; color: var(--ink-soft); }
.section-dark .pillar { border-top-color: var(--copper-tint); }
.section-dark .pillar p { color: #b8c2bd; }

/* ---------- Faculty ---------- */
.faculty-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px;
}
.faculty-card h3 { font-size: 1.16rem; margin-bottom: 5px; }
.faculty-card .role { font-size: 11.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--crimson); margin-bottom: 11px; }
.faculty-card p { font-size: 14.5px; line-height: 1.66; color: var(--ink-soft); }
.faculty-card { border-top: 1px solid var(--line); padding-top: 22px; transition: border-color .25s; }
.faculty-card:hover { border-top-color: var(--crimson); }

/* ---------- Module rail (flagship course page) ---------- */
.module-rail { border-left: 1px solid var(--copper-tint); margin-left: 8px; }
.module {
  position: relative;
  padding: 0 0 48px 48px;
}
.module:last-child { padding-bottom: 0; }
.module::before {
  content: attr(data-n);
  position: absolute;
  left: -21px;
  top: -3px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--porcelain);
  border: 1px solid var(--crimson);
  color: var(--crimson);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.module h3 { margin-bottom: 9px; }
.module .where {
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 11px;
}
.module p { color: var(--ink-soft); font-size: 15.5px; line-height: 1.7; max-width: 62ch; }

/* ---------- Two-column info ---------- */
.split { display: grid; grid-template-columns: 5fr 7fr; gap: 80px; align-items: start; }
.split.rev { grid-template-columns: 7fr 5fr; }
.sticky-side { position: sticky; top: 130px; }

/* ---------- Fact table ---------- */
.fact-table { width: 100%; border-collapse: collapse; font-size: 15.5px; }
.fact-table th, .fact-table td { text-align: left; padding: 15px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.fact-table th { font-weight: 600; width: 42%; padding-right: 20px; }
.fact-table td { color: var(--ink-soft); }

/* ---------- FAQ ---------- */
details.faq {
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
}
details.faq summary {
  font-family: var(--font-display);
  font-weight: 480;
  font-size: 1.2rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  transition: color .2s;
}
details.faq summary:hover { color: var(--crimson-deep); }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; font-family: var(--font-body); font-weight: 400; color: var(--crimson); font-size: 1.5rem; transition: transform .25s; }
details.faq[open] summary::after { transform: rotate(45deg); }
details.faq p { margin-top: 15px; color: var(--ink-soft); line-height: 1.72; max-width: 68ch; }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--crimson-deep), var(--crimson));
  color: #fff;
  padding: 84px 0;
}
.cta-band .wrap { display: flex; align-items: center; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.cta-band h2 { max-width: 22ch; }
.cta-band .btn { border-color: rgba(255,255,255,0.85); color: #fff; }
.cta-band .btn:hover { background: #fff; color: var(--crimson-deep); border-color: #fff; }

/* ---------- Testimonial ---------- */
.quote {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 440;
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  line-height: 1.45;
  max-width: 32ch;
  position: relative;
  padding-left: 34px;
}
.quote::before {
  content: "\201C";
  position: absolute;
  left: 0;
  top: -12px;
  font-size: 3.4rem;
  line-height: 1;
  color: var(--copper-tint);
  font-style: normal;
}
.quote-attrib { margin-top: 26px; font-size: 12.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); }

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.form-grid .full { grid-column: 1 / -1; }
label { font-size: 12px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; display: block; margin-bottom: 9px; color: var(--ink-soft); }
input, select, textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 16px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  transition: border-color .2s;
}
input:hover, select:hover, textarea:hover { border-color: var(--copper-tint); }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--crimson); outline-offset: 0; border-color: var(--crimson); }

/* ---------- Footer ---------- */
.site-footer {
  background: linear-gradient(180deg, var(--ink), #0b1a1e);
  color: #b8c2bd;
  padding: 84px 0 40px;
  font-size: 15px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 52px; margin-bottom: 60px; }
.site-footer h4 { font-family: var(--font-body); font-size: 11px; font-weight: 600; letter-spacing: 0.26em; text-transform: uppercase; color: var(--copper-tint); margin-bottom: 20px; }
.site-footer ul { list-style: none; display: grid; gap: 11px; }
.site-footer a { text-decoration: none; transition: color .18s; }
.site-footer a:hover { color: var(--porcelain); }
.footer-brand img { height: 38px; width: auto; filter: invert(1) brightness(1.7); margin-bottom: 20px; opacity: 0.94; }
.footer-legal { border-top: 1px solid var(--line-dark); padding-top: 30px; display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; font-size: 12.5px; letter-spacing: 0.02em; color: #8fa09b; }

/* ---------- Breadcrumb ---------- */
.crumbs { font-size: 12.5px; letter-spacing: 0.03em; color: var(--ink-faint); padding: 24px 0 0; }
.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--crimson); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero .wrap, .split, .split.rev { grid-template-columns: 1fr; gap: 48px; }
  .hero-side { border-left: none; border-top: 1px solid var(--copper-tint); padding: 30px 0 0; grid-template-columns: repeat(3, 1fr); }
  .course-grid, .pillars { grid-template-columns: 1fr 1fr; }
  .faculty-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .sticky-side { position: static; }
}
@media (max-width: 640px) {
  .header-top { display: none; }
  .nav { display: none; }
  .nav.open {
    display: grid;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 22px 28px 30px;
    gap: 18px;
    box-shadow: var(--shadow-soft);
  }
  .nav-toggle {
    display: block;
    background: none;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 9px 14px;
    font-size: 14px;
    font-family: var(--font-body);
    cursor: pointer;
  }
  .hero { padding: 64px 0; }
  .hero-side { grid-template-columns: 1fr; gap: 22px; }
  .course-grid, .pillars, .faculty-grid, .form-grid { grid-template-columns: 1fr; }
  .section { padding: 68px 0; }
}


/* ---------- Photography: unified petrol grade ---------- */
.figure {
  position: relative;
  overflow: hidden;
  border-radius: 0;
}
.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.82) contrast(1.04) brightness(1.01);
}
.figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15,33,38,0.06), rgba(15,33,38,0.22));
  mix-blend-mode: multiply;
  pointer-events: none;
}
.figure::before {
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px solid rgba(217,160,107,0.45);
  z-index: 1;
  pointer-events: none;
}
.figure.tall { aspect-ratio: 4 / 5; }
.figure.wide { aspect-ratio: 16 / 10; }

/* hero with figure */
.hero-figure { position: relative; }
.hero-figure .figure { aspect-ratio: 4 / 5; box-shadow: var(--shadow-soft); }
.hero-figure .figure-caption {
  position: absolute;
  left: -22px;
  bottom: 34px;
  background: var(--ink);
  color: var(--porcelain);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 12px 20px;
  z-index: 2;
}

/* stat band under hero */
.stat-band { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--paper); }
.stat-band .wrap { display: grid; grid-template-columns: repeat(3,1fr); gap: 32px; padding-top: 34px; padding-bottom: 34px; }

/* photo band strip */
.photo-band { display: grid; grid-template-columns: 5fr 4fr 3fr; gap: 18px; margin-top: 64px; }
.photo-band .figure { aspect-ratio: auto; height: 300px; }

/* split with figure */
.split .figure { position: sticky; top: 130px; }

@media (max-width: 960px) {
  .stat-band .wrap { grid-template-columns: repeat(3,1fr); gap: 18px; }
  .photo-band { grid-template-columns: 1fr 1fr; }
  .photo-band .figure:last-child { display: none; }
  .split .figure { position: static; }
}
@media (max-width: 640px) {
  .stat-band .wrap { grid-template-columns: 1fr; }
  .photo-band { grid-template-columns: 1fr; }
  .photo-band .figure { height: 220px; }
  .hero-figure .figure-caption { left: 0; }
}