/* style.css — UK Baseline design tokens + components */

/* Fonts */
@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300&display=swap');

/* ─── DESIGN TOKENS ─────────────────────────────────────── */
:root {
  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Content widths */
  --content-narrow:  640px;
  --content-default: 960px;
  --content-wide:    1200px;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
}

/* ─── LIGHT MODE ─────────────────────────────────────────── */
:root, [data-theme='light'] {
  /* Surfaces — cool slate, intelligence feel */
  --color-bg:             #F4F5F7;
  --color-surface:        #FAFAFA;
  --color-surface-2:      #FFFFFF;
  --color-surface-offset: #ECEEF1;
  --color-divider:        #DDE0E6;
  --color-border:         #C8CDD6;

  /* Text */
  --color-text:         #1A1D23;
  --color-text-muted:   #6B7280;
  --color-text-faint:   #9CA3AF;
  --color-text-inverse: #F9FAFB;

  /* Primary — deep ink blue, authority */
  --color-primary:           #1E3A5F;
  --color-primary-hover:     #162D4A;
  --color-primary-active:    #0E2035;
  --color-primary-highlight: #D0DBE8;

  /* Accent — precise teal for data callouts */
  --color-accent:       #0F7B74;
  --color-accent-hover: #0A5C57;

  /* Verified badge */
  --color-verified:    #166534;
  --color-verified-bg: #DCFCE7;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(30,58,95,0.08);
  --shadow-md: 0 4px 12px rgba(30,58,95,0.10);
  --shadow-lg: 0 12px 32px rgba(30,58,95,0.14);
}

/* ─── DARK MODE ──────────────────────────────────────────── */
[data-theme='dark'] {
  --color-bg:             #0F1117;
  --color-surface:        #161820;
  --color-surface-2:      #1C1F2A;
  --color-surface-offset: #131520;
  --color-divider:        #252836;
  --color-border:         #2E3245;
  --color-text:           #E2E5ED;
  --color-text-muted:     #8B91A0;
  --color-text-faint:     #555C70;
  --color-text-inverse:   #0F1117;
  --color-primary:        #6B9FD4;
  --color-primary-hover:  #4F85BE;
  --color-primary-active: #3A6FA8;
  --color-primary-highlight: #1E2D40;
  --color-accent:         #34C5BB;
  --color-accent-hover:   #22A89F;
  --color-verified:       #4ADE80;
  --color-verified-bg:    #14532D;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0F1117;
    --color-surface:        #161820;
    --color-surface-2:      #1C1F2A;
    --color-surface-offset: #131520;
    --color-divider:        #252836;
    --color-border:         #2E3245;
    --color-text:           #E2E5ED;
    --color-text-muted:     #8B91A0;
    --color-text-faint:     #555C70;
    --color-text-inverse:   #0F1117;
    --color-primary:        #6B9FD4;
    --color-primary-hover:  #4F85BE;
    --color-primary-active: #3A6FA8;
    --color-primary-highlight: #1E2D40;
    --color-accent:         #34C5BB;
    --color-accent-hover:   #22A89F;
    --color-verified:       #4ADE80;
    --color-verified-bg:    #14532D;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  }
}

/* ─── LAYOUT ─────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 5vw, var(--space-16));
}
.container--narrow { max-width: var(--content-default); }
.container--tight  { max-width: var(--content-narrow); }

/* ─── HEADER / NAV ───────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow var(--transition-interactive);
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding-block: var(--space-4);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}
.nav__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}
.nav__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color var(--transition-interactive);
}
.nav__links a:hover,
.nav__links a.active { color: var(--color-primary); }

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background var(--transition-interactive),
              color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-sm);
}
.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.btn--ghost:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  background: transparent;
  cursor: pointer;
  transition: color var(--transition-interactive),
              border-color var(--transition-interactive);
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-text-muted); }

/* Mobile nav */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}
.nav__hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-5);
    box-shadow: var(--shadow-md);
  }
  .nav__links.open { display: flex; }
  .nav__hamburger { display: flex; }
}

/* ─── HERO ───────────────────────────────────────────────── */
.hero {
  padding-block: clamp(var(--space-16), 10vw, var(--space-32));
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%,
    color-mix(in srgb, var(--color-primary) 8%, transparent) 0%,
    transparent 70%);
  pointer-events: none;
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-6);
}
.hero__eyebrow::before {
  content: '';
  display: block;
  width: 20px; height: 1px;
  background: var(--color-accent);
}
.hero__eyebrow::after {
  content: '';
  display: block;
  width: 20px; height: 1px;
  background: var(--color-accent);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--color-text);
  margin-bottom: var(--space-6);
  max-width: 14ch;
  margin-inline: auto;
  line-height: 1.05;
}

.hero__tagline {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  font-weight: 300;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero__description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-inline: auto;
  margin-bottom: var(--space-10);
  line-height: 1.7;
}
.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ─── STATS BAR ──────────────────────────────────────────── */
.stats-bar {
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
  padding-block: var(--space-8);
}
.stats-bar__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-8);
  text-align: center;
}
.stat__value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-1);
}
.stat__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

/* ─── SECTION ────────────────────────────────────────────── */
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}
.section--alt { background: var(--color-surface); }

.section__header {
  margin-bottom: var(--space-12);
}
.section__eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
  line-height: 1.1;
  margin-bottom: var(--space-4);
}
.section__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 56ch;
  line-height: 1.7;
}

/* ─── BRIEF CARDS ────────────────────────────────────────── */
.briefs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-6);
}

.brief-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--transition-interactive),
              transform var(--transition-interactive),
              border-color var(--transition-interactive);
  display: flex;
  flex-direction: column;
}
.brief-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-primary-highlight);
}

.brief-card__header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-divider);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brief-card__number {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.brief-card__tag {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.brief-card__tag--new {
  background: var(--color-verified-bg);
  color: var(--color-verified);
}

.brief-card__body {
  padding: var(--space-6);
  flex: 1;
  display: flex;
  flex-direction: column;
}
.brief-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-3);
  line-height: 1.15;
}
.brief-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  flex: 1;
  margin-bottom: var(--space-5);
  max-width: unset;
}
.brief-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.brief-card__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.brief-card__footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-divider);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.source-badge {
  font-size: var(--text-xs);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  border: 1px solid var(--color-divider);
  font-weight: 500;
}

/* Coming soon card */
.brief-card--coming {
  opacity: 0.6;
  cursor: default;
}
.brief-card--coming:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--color-border);
}

/* ─── STANDARDS / HOW IT WORKS ───────────────────────────── */
.standards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-6);
}
.standard-card {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.standard-card__icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
}
.standard-card__title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.standard-card__body {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: unset;
}

/* ─── VERIFIED BANNER ────────────────────────────────────── */
.verified-banner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6);
  background: var(--color-verified-bg);
  border: 1px solid color-mix(in srgb, var(--color-verified) 30%, transparent);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--color-verified);
  font-weight: 500;
  margin-bottom: var(--space-8);
}

/* ─── SUBSCRIBE SECTION ──────────────────────────────────── */
.subscribe-section {
  background: var(--color-primary);
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
  text-align: center;
  color: var(--color-text-inverse);
}
.subscribe-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
  color: #fff;
}
.subscribe-section p {
  font-size: var(--text-base);
  opacity: 0.8;
  margin-bottom: var(--space-8);
  max-width: 44ch;
  margin-inline: auto;
}
.subscribe-form {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
  max-width: 480px;
  margin-inline: auto;
}
.subscribe-form input[type="email"] {
  flex: 1;
  min-width: 220px;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.12);
  color: #fff;
  font-size: var(--text-sm);
  outline: none;
}
.subscribe-form input[type="email"]::placeholder { color: rgba(255,255,255,0.55); }
.subscribe-form input[type="email"]:focus {
  border-color: rgba(255,255,255,0.7);
  background: rgba(255,255,255,0.18);
}
.btn--white {
  background: #fff;
  color: var(--color-primary);
  font-weight: 600;
}
.btn--white:hover { background: #f0f4f8; }

.subscribe-note {
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  opacity: 0.6;
}

/* ─── FOOTER ─────────────────────────────────────────────── */
.site-footer {
  background: #163A3F;
  border-top: 3px solid #20808D;
  padding-block: var(--space-14);
  margin-top: var(--space-16);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: var(--space-8);
}
.footer__brand {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.04em;
}
.footer__links {
  display: flex;
  gap: var(--space-8);
  list-style: none;
}
.footer__links a {
  font-size: var(--text-sm);
  color: #BCE2E7;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  transition: color 0.2s;
}
.footer__links a:hover { color: #FFFFFF; }
.footer__note {
  font-size: var(--text-sm);
  color: #8CB8BE;
  margin-top: var(--space-6);
  text-align: center;
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: var(--space-8);
  padding-bottom: var(--space-2);
  border-top: 1px solid #2A6B73;
  padding-top: var(--space-5);
}

/* ─── PAGE HEADER (inner pages) ──────────────────────────── */
.page-header {
  padding-block: clamp(var(--space-10), 6vw, var(--space-20));
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
}
.page-header__eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.page-header__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.page-header__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 56ch;
  line-height: 1.7;
}

/* ─── ABOUT PAGE ─────────────────────────────────────────── */
.about-prose {
  max-width: 65ch;
}
.about-prose h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
}
.about-prose p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-4);
  max-width: unset;
}
.about-prose ul {
  padding-left: var(--space-5);
  margin-bottom: var(--space-4);
}
.about-prose li {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-2);
  max-width: unset;
}
.caveat-block {
  padding: var(--space-5) var(--space-6);
  background: color-mix(in srgb, var(--color-accent) 8%, var(--color-surface));
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-block: var(--space-6);
}
.caveat-block p {
  color: var(--color-text);
  font-size: var(--text-sm);
  margin-bottom: 0;
}

/* ─── BRIEF DETAIL PAGE ──────────────────────────────────── */
.graphics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}
.graphic-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.graphic-item__img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: #1B474D;
}
.graphic-item__info {
  padding: var(--space-4);
}
.graphic-item__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.graphic-item__sub {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ─── ANIMATIONS ─────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up {
  animation: fadeUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}
.fade-up--delay-1 { animation-delay: 0.1s; }
.fade-up--delay-2 { animation-delay: 0.2s; }
.fade-up--delay-3 { animation-delay: 0.3s; }

/* ─── DOMAIN BADGE ────────────────────────────────────────── */
.nav__domain {
  font-size: 11px;
  font-weight: 700;
  color: #FFFFFF;
  text-decoration: none;
  letter-spacing: 0.06em;
  text-transform: lowercase;
  opacity: 0.80;
  margin-right: var(--space-4);
  white-space: nowrap;
  transition: opacity 0.2s;
}
.nav__domain:hover { opacity: 1; }

/* ─── NAV DROPDOWN ──────────────────────────────────────── */
.nav__dropdown {
  position: relative;
}
.nav__dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  transition: color var(--transition-interactive);
  font-family: inherit;
}
.nav__dropdown-toggle:hover { color: var(--color-primary); }
.nav__dropdown-toggle svg {
  width: 12px; height: 12px;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}
.nav__dropdown.open .nav__dropdown-toggle svg { transform: rotate(180deg); }
.nav__dropdown-toggle.active { color: var(--color-primary); }

.nav__dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 180px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-2) 0;
  z-index: 200;
  list-style: none;
}
.nav__dropdown.open .nav__dropdown-menu { display: block; }
.nav__dropdown-menu li a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color var(--transition-interactive),
              background var(--transition-interactive);
}
.nav__dropdown-menu li a:hover,
.nav__dropdown-menu li a.active {
  color: var(--color-primary);
  background: var(--color-surface-alt);
}

@media (max-width: 768px) {
  .nav__dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-top: 1px solid var(--color-border);
    border-radius: 0;
    padding: var(--space-2) 0 0 var(--space-4);
    margin-top: var(--space-2);
  }
  .nav__dropdown.open .nav__dropdown-menu { display: block; }
}