/* mellenia.co.uk — deep navy + gold/amber academic elegant */
:root,
[data-theme="light"] {
  --bg: #f7f5f0;
  --bg-elevated: #ffffff;
  --bg-alt: #efece4;
  --text: #1a2433;
  --text-muted: #5c6570;
  --border: #d4cfc3;
  --navy: #1a2744;
  --navy-deep: #0f1a2e;
  --primary: #1a2744;
  --primary-hover: #0f1a2e;
  --accent: #b8860b;
  --accent-soft: #c9a227;
  --accent-hover: #9a7209;
  --gold-line: rgba(184, 134, 11, 0.35);
  --hero-grad: linear-gradient(145deg, #0f1a2e 0%, #1a2744 48%, #243656 100%);
  --shadow: 0 10px 30px rgba(15, 26, 46, 0.08);
  --focus: #b8860b;
  --radius: 10px;
  --font-serif: Georgia, "Times New Roman", Times, serif;
  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;
  --max: 1080px;
  --header-h: 4.25rem;
  --on-hero: #f7f5f0;
  --on-hero-muted: rgba(247, 245, 240, 0.78);
}

[data-theme="dark"] {
  --bg: #0c121c;
  --bg-elevated: #141c2b;
  --bg-alt: #101825;
  --text: #e8e4d9;
  --text-muted: #9aa3b0;
  --border: #2a3548;
  --navy: #c9a227;
  --navy-deep: #e8d48b;
  --primary: #d4af37;
  --primary-hover: #e8c547;
  --accent: #d4af37;
  --accent-soft: #e8c547;
  --accent-hover: #f0d060;
  --gold-line: rgba(212, 175, 55, 0.4);
  --hero-grad: linear-gradient(145deg, #070b12 0%, #0f1a2e 50%, #162038 100%);
  --shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
  --focus: #d4af37;
  --on-hero: #e8e4d9;
  --on-hero-muted: rgba(232, 228, 217, 0.75);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-size: 1.05rem;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--accent-hover);
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  background: var(--accent);
  color: #0f1a2e;
  padding: 0.5rem 1rem;
  z-index: 1000;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  left: 0.5rem;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Typography */
h1,
h2,
h3,
h4,
.logo {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 {
  font-size: clamp(2rem, 5vw, 2.85rem);
  margin: 0 0 1rem;
}

h2 {
  font-size: clamp(1.45rem, 3vw, 1.85rem);
  margin: 0 0 0.85rem;
}

h3 {
  font-size: 1.2rem;
  margin: 0 0 0.5rem;
}

p {
  margin: 0 0 1rem;
}

.lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 40rem;
  line-height: 1.75;
}

.section-intro {
  color: var(--text-muted);
  max-width: 38rem;
  margin-bottom: 1.75rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg-elevated) 90%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
  flex-wrap: wrap;
}

.logo {
  font-size: 1.2rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.logo span {
  color: var(--accent);
  font-weight: 400;
  font-style: italic;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.theme-toggle,
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.5rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
  font-family: var(--font-sans);
}

.nav-toggle {
  width: 2.5rem;
  padding: 0;
  font-size: 1.15rem;
}

.nav-wrap {
  display: none;
  width: 100%;
  order: 3;
  padding: 0.5rem 0 1rem;
  border-top: 1px solid var(--border);
}

.nav-wrap.is-open {
  display: block;
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.site-nav a {
  color: var(--text);
  text-decoration: none;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.95rem;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent-hover);
}

/* Hero */
.hero {
  background: var(--hero-grad);
  color: var(--on-hero);
  padding: 4rem 0 4.5rem;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent-soft), transparent);
}

.hero h1 {
  color: var(--on-hero);
}

.hero .lead {
  color: var(--on-hero-muted);
}

.badge {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-soft);
  margin-bottom: 1rem;
  border: 1px solid color-mix(in srgb, var(--accent-soft) 45%, transparent);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.5rem 0 1.75rem;
}

.chip {
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--on-hero) 22%, transparent);
  color: var(--on-hero-muted);
  background: color-mix(in srgb, var(--on-hero) 6%, transparent);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: #0f1a2e;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #0f1a2e;
  border-color: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--on-hero);
  border-color: color-mix(in srgb, var(--on-hero) 35%, transparent);
}

.btn-ghost:hover {
  background: color-mix(in srgb, var(--on-hero) 10%, transparent);
  color: var(--on-hero);
}

.btn-solid {
  background: var(--primary);
  color: #f7f5f0;
  border-color: var(--primary);
}

[data-theme="dark"] .btn-solid {
  color: #0f1a2e;
}

.btn-solid:hover {
  background: var(--primary-hover);
  color: #f7f5f0;
  border-color: var(--primary-hover);
}

[data-theme="dark"] .btn-solid:hover {
  color: #0f1a2e;
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent-hover);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

/* Sections */
.section {
  padding: 3.5rem 0;
}

.section-alt {
  background: var(--bg-alt);
  border-block: 1px solid var(--border);
}

.page-hero {
  padding: 2.75rem 0 2rem;
  border-bottom: 1px solid var(--gold-line);
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--accent) 6%, var(--bg)) 0%,
    var(--bg) 100%
  );
}

.page-hero p {
  color: var(--text-muted);
  max-width: 40rem;
  margin: 0;
}

/* Cards & grids */
.grid-2 {
  display: grid;
  gap: 1.25rem;
}

.grid-3 {
  display: grid;
  gap: 1.25rem;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.4rem;
  box-shadow: var(--shadow);
}

.card .icon {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.card p {
  color: var(--text-muted);
  margin-bottom: 0;
  font-size: 0.98rem;
}

.card a.card-link {
  display: inline-block;
  margin-top: 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--gold-line);
}

.timeline li {
  position: relative;
  padding: 0 0 1.75rem 1.5rem;
}

.timeline li:last-child {
  padding-bottom: 0;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -0.4rem;
  top: 0.35rem;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}

.timeline h3 {
  margin-bottom: 0.35rem;
}

.timeline p {
  color: var(--text-muted);
  margin: 0;
}

.principle {
  display: grid;
  gap: 0.35rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.principle:last-child {
  border-bottom: none;
}

.principle .num {
  font-family: var(--font-serif);
  color: var(--accent);
  font-size: 0.9rem;
  letter-spacing: 0.06em;
}

.quote-block {
  border-left: 3px solid var(--accent);
  padding: 0.25rem 0 0.25rem 1.25rem;
  margin: 1.5rem 0;
}

.quote-block p {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-style: italic;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.quote-block cite {
  font-style: normal;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Form */
.form {
  display: grid;
  gap: 1.1rem;
  max-width: 32rem;
}

.form label {
  display: grid;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.92rem;
}

.form input,
.form textarea,
.form select {
  font: inherit;
  font-weight: 400;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elevated);
  color: var(--text);
}

.form textarea {
  min-height: 9rem;
  resize: vertical;
}

.form-note {
  color: var(--text-muted);
  font-size: 0.92rem;
  max-width: 36rem;
}

.form-success {
  display: none;
  margin: 1rem 0;
  padding: 1rem 1.15rem;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  background: color-mix(in srgb, var(--accent) 12%, var(--bg-elevated));
  color: var(--text);
}

.form-success.is-visible {
  display: block;
}

/* Prose pages */
.prose {
  max-width: 40rem;
}

.prose h2 {
  margin-top: 2rem;
}

.prose ul {
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose li::marker {
  color: var(--accent);
}

/* Footer */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 1.75rem 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--text-muted);
}

.site-footer a:hover {
  color: var(--accent);
}

/* Desktop nav */
@media (min-width: 800px) {
  .header-inner {
    flex-wrap: nowrap;
  }

  .header-actions {
    order: 3;
    margin-left: 0;
  }

  .nav-toggle {
    display: none;
  }

  .nav-wrap {
    display: block;
    width: auto;
    order: 2;
    flex: 1;
    padding: 0;
    border: none;
    margin-left: 1.5rem;
  }

  .site-nav {
    flex-direction: row;
    justify-content: flex-end;
    gap: 0.15rem;
  }

  .site-nav a {
    padding: 0.45rem 0.8rem;
  }

  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }

  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .btn {
    transition: none;
  }
}