/* ============================================================
   UK Tax Drag - Mega navigation
   - Premium 7-hub mega-menu
   - Responsive (desktop dropdowns / mobile drawer)
   - Light + dark mode aware via CSS variables
   - Designed to replace all legacy .site-nav / .nav-brand patterns
   ============================================================ */

:root {
  --mn-bg: #0f2a20;
  --mn-bg-deep: #0a1f17;
  --mn-text: #faf6ee;
  --mn-text-dim: #d8cfb5;
  --mn-gold: #c9a961;
  --mn-gold-bright: #d8bb79;
  --mn-rule: rgba(201, 169, 97, 0.22);
  --mn-panel-bg: #ffffff;
  --mn-panel-text: #1a3a2e;
  --mn-panel-muted: #6b6353;
  --mn-panel-rule: #e3dac4;
  --mn-panel-hover: #faf6ee;
  --mn-shadow: 0 22px 60px rgba(15, 42, 32, 0.28);
}

html[data-theme="dark"] {
  --mn-bg: #050d09;
  --mn-bg-deep: #020604;
  --mn-text: #f2ead6;
  --mn-text-dim: #c6bca0;
  --mn-panel-bg: #15221c;
  --mn-panel-text: #f2ead6;
  --mn-panel-muted: #b0a78f;
  --mn-panel-rule: #28362d;
  --mn-panel-hover: #1c2a23;
  --mn-shadow: 0 22px 60px rgba(0, 0, 0, 0.55);
}

.tdx-mn {
  background: var(--mn-bg);
  border-bottom: 3px solid var(--mn-gold);
  position: sticky;
  top: 0;
  z-index: 1000;
  font-family: 'Lato', system-ui, -apple-system, sans-serif;
}

.tdx-mn__inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.tdx-mn__brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--mn-text);
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 700;
  font-size: 1.28rem;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.tdx-mn__brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--mn-gold) 0%, var(--mn-gold-bright) 100%);
  color: var(--mn-bg-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Playfair Display', Georgia, serif;
  font-weight: 700;
  font-size: 1.35rem;
  line-height: 1;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25), inset 0 -2px 4px rgba(0, 0, 0, 0.08);
  letter-spacing: -0.02em;
}

.tdx-mn__brand-text { color: var(--mn-text); }
.tdx-mn__brand-text em {
  color: var(--mn-gold);
  font-style: normal;
  font-weight: 700;
}

.tdx-mn__nav {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1 1 auto;
  justify-content: center;
}

.tdx-mn__item {
  position: relative;
}

.tdx-mn__link {
  display: inline-block;
  padding: 1.15rem 1rem;
  color: var(--mn-text);
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.18s ease, background 0.18s ease;
  cursor: pointer;
  border: 0;
  background: transparent;
  font-family: inherit;
  position: relative;
}

.tdx-mn__link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 3px;
  background: var(--mn-gold);
  transform: translateX(-50%);
  transition: width 0.18s ease;
}

.tdx-mn__link:hover,
.tdx-mn__link:focus-visible,
.tdx-mn__item--open .tdx-mn__link {
  color: var(--mn-gold-bright);
  outline: 0;
}

.tdx-mn__link:hover::after,
.tdx-mn__link:focus-visible::after,
.tdx-mn__item--open .tdx-mn__link::after {
  width: calc(100% - 2rem);
}

.tdx-mn__caret {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 0.35rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.18s ease;
  vertical-align: middle;
  margin-top: -3px;
  opacity: 0.7;
}

.tdx-mn__item--open .tdx-mn__caret {
  transform: rotate(-135deg);
  margin-top: 1px;
}

.tdx-mn__panel {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 720px;
  max-width: 900px;
  background: var(--mn-panel-bg);
  color: var(--mn-panel-text);
  border-radius: 0 0 14px 14px;
  box-shadow: var(--mn-shadow);
  padding: 1.6rem 1.8rem;
  display: none;
  border: 1px solid var(--mn-panel-rule);
  border-top: 0;
}

.tdx-mn__item--open .tdx-mn__panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.4rem 1.8rem;
}

.tdx-mn__panel--narrow { min-width: 520px; }
.tdx-mn__item--open .tdx-mn__panel--narrow { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.tdx-mn__col h4 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--mn-panel-muted);
  margin: 0 0 0.7rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--mn-panel-rule);
}

.tdx-mn__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tdx-mn__col li {
  margin: 0;
}

.tdx-mn__col a {
  display: block;
  padding: 0.46rem 0.55rem;
  margin-left: -0.55rem;
  color: var(--mn-panel-text);
  text-decoration: none;
  font-size: 0.92rem;
  line-height: 1.45;
  border-radius: 6px;
  transition: background 0.15s ease, color 0.15s ease;
  font-weight: 500;
}

.tdx-mn__col a:hover,
.tdx-mn__col a:focus-visible {
  background: var(--mn-panel-hover);
  color: var(--mn-gold-deep, #a8862f);
  outline: 0;
}

html[data-theme="dark"] .tdx-mn__col a:hover,
html[data-theme="dark"] .tdx-mn__col a:focus-visible {
  color: var(--mn-gold-bright);
}

.tdx-mn__see-all {
  grid-column: 1 / -1;
  border-top: 1px solid var(--mn-panel-rule);
  margin-top: 0.4rem;
  padding-top: 0.9rem;
  text-align: center;
}

.tdx-mn__see-all a {
  display: inline-block;
  padding: 0.55rem 1.2rem;
  background: var(--mn-bg);
  color: var(--mn-text);
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tdx-mn__see-all a:hover {
  background: var(--mn-gold);
  color: var(--mn-bg);
}

.tdx-mn__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.tdx-mn__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 1.05rem;
  background: transparent;
  color: var(--mn-gold);
  border: 1.5px solid var(--mn-gold);
  border-radius: 999px;
  text-decoration: none;
  font-family: 'Lato', system-ui, sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
  margin-right: 0.35rem;
}

.tdx-mn__cta::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--mn-gold);
  display: inline-block;
  flex-shrink: 0;
  animation: tdx-cta-pulse 2.4s ease-in-out infinite;
}

@keyframes tdx-cta-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.tdx-mn__cta:hover,
.tdx-mn__cta:focus-visible {
  background: var(--mn-gold);
  color: var(--mn-bg-deep);
  outline: 0;
  transform: translateY(-1px);
}

.tdx-mn__cta:hover::before,
.tdx-mn__cta:focus-visible::before {
  background: var(--mn-bg-deep);
  animation: none;
}

@media (max-width: 1024px) {
  .tdx-mn__cta { font-size: 0.72rem; padding: 0.5rem 0.85rem; }
}

@media (max-width: 880px) {
  .tdx-mn__cta {
    /* On mobile, hide the CTA and rely on the in-drawer link */
    display: none;
  }
}

.tdx-mn__icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--mn-text);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  padding: 0;
  font-family: inherit;
}

.tdx-mn__icon-btn:hover,
.tdx-mn__icon-btn:focus-visible {
  background: rgba(201, 169, 97, 0.14);
  border-color: var(--mn-gold);
  color: var(--mn-gold-bright);
  outline: 0;
}

.tdx-mn__icon-btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tdx-mn__mobile-toggle {
  display: none;
}

/* ============================================================
   Mobile
   ============================================================ */
@media (max-width: 1024px) {
  .tdx-mn__inner { padding: 0 1rem; }
  .tdx-mn__link { padding: 1.15rem 0.65rem; font-size: 0.78rem; }
  .tdx-mn__panel { min-width: 580px; padding: 1.3rem; }
}

@media (max-width: 880px) {
  .tdx-mn__inner { min-height: 60px; }
  .tdx-mn__brand { font-size: 1.1rem; }
  .tdx-mn__brand-mark { width: 32px; height: 32px; font-size: 0.95rem; }
  .tdx-mn__nav {
    position: fixed;
    inset: 60px 0 0 0;
    background: var(--mn-bg);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    overflow-y: auto;
    padding: 1rem 0 4rem;
    transform: translateX(100%);
    transition: transform 0.25s ease;
    gap: 0;
  }
  .tdx-mn--open .tdx-mn__nav {
    transform: translateX(0);
  }
  .tdx-mn__item {
    border-bottom: 1px solid var(--mn-rule);
  }
  .tdx-mn__link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.4rem;
    width: 100%;
    text-align: left;
  }
  .tdx-mn__link::after { display: none; }
  .tdx-mn__panel {
    position: static;
    transform: none;
    min-width: 0;
    max-width: none;
    box-shadow: none;
    border: 0;
    border-top: 1px solid var(--mn-rule);
    border-radius: 0;
    padding: 0;
    background: var(--mn-bg-deep);
    color: var(--mn-text);
  }
  .tdx-mn__item--open .tdx-mn__panel {
    display: block;
    padding: 0.8rem 1.4rem 1.2rem;
  }
  .tdx-mn__col {
    padding: 0.8rem 0;
  }
  .tdx-mn__col + .tdx-mn__col {
    border-top: 1px solid var(--mn-rule);
  }
  .tdx-mn__col h4 {
    color: var(--mn-gold);
    border-bottom: 0;
    padding-bottom: 0.3rem;
  }
  .tdx-mn__col a {
    color: var(--mn-text-dim);
    padding: 0.4rem 0;
    margin-left: 0;
    font-size: 0.94rem;
  }
  .tdx-mn__col a:hover,
  .tdx-mn__col a:focus-visible {
    background: transparent;
    color: var(--mn-gold-bright);
  }
  .tdx-mn__see-all {
    border-top: 1px solid var(--mn-rule);
  }
  .tdx-mn__see-all a {
    background: var(--mn-gold);
    color: var(--mn-bg);
  }
  .tdx-mn__mobile-toggle {
    display: inline-flex;
  }
  .tdx-mn__actions { gap: 0.3rem; }
}

/* Skip links and accessibility */
.tdx-mn-skip {
  position: absolute;
  top: -40px;
  left: 8px;
  background: var(--mn-gold);
  color: var(--mn-bg);
  padding: 8px 14px;
  border-radius: 4px;
  z-index: 1100;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.85rem;
}
.tdx-mn-skip:focus { top: 12px; }

/* Print: hide nav */
@media print {
  .tdx-mn { display: none; }
}