/* ============================================================
   AidBio site chrome — shared by every page (index, aidweather,
   portfolio/*, and any future page).

   Owns: layout tokens, base reset, type helpers, buttons, the fixed
   header (logo, links, theme + language switchers, mobile menu), the
   optional local sub-navigation strip, hero base, footer, reveal.

   Brand tokens (colour, type, spacing, radii, shadows, motion) come
   from assets/ds/styles.css, vendored from the aidbio-design repo.
   Page-specific components stay in each page's own <style>/CSS file.
   Header + footer HTML is generated — see scripts/sync-chrome.py.
   ============================================================ */

:root {
  color-scheme: light dark;

  /* Layout */
  --max-w: 1200px;
  --nav-h: 76px;
  --subnav-h: 52px;

  /* Shared heading scale (used by .heading-* and portfolio h1/h2/h3) */
  --fs-h1: clamp(38px, 6vw, 76px);
  --fs-h2: clamp(28px, 4vw, 40px);
  --fs-h3: 22px;
  --fs-page-title: clamp(34px, 5vw, 56px); /* editorial page titles (portfolio chapters) */

  /* Nav backdrop — not a DS token (translucency tuned per page) */
  --surface-nav: rgba(251, 252, 254, 0.82);
}

html[data-theme="dark"] {
  --surface-nav: rgba(14, 18, 25, 0.82);
}

/* ============================================================ Base */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  margin: 0;
  font-family: var(--font-ui);
  background: var(--surface-base);
  color: var(--text-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition:
    background-color var(--dur-base) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition:
    color var(--dur-fast) var(--ease-out),
    opacity var(--dur-fast) var(--ease-out);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

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

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

.container {
  width: min(calc(100% - 2 * var(--space-4)), var(--max-w));
  margin-inline: auto;
}

/* Theme-paired logo images */
.mark-dark {
  display: none;
}

html[data-theme="dark"] .mark-light {
  display: none;
}

html[data-theme="dark"] .mark-dark {
  display: block;
}

/* ============================================================ Type */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.eyebrow.warm {
  color: var(--accent-warm);
}

.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.heading-lg {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--text-strong);
  max-width: 15ch;
}

.heading-md {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--text-strong);
}

.accent-italic {
  font-style: italic;
  color: var(--accent);
}

.headline-nature {
  color: var(--spectrum-indigo);
}

.headline-decoded {
  color: var(--spectrum-coral);
}

/* Sparse gradient-clip accent word — used once per major section
   heading, never on the hero (which keeps its own flat two-color
   split above) and never on eyebrows. */
.accent-spectrum {
  background-image: var(--gradient-aurora);
  color: var(--spectrum-indigo);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.accent-spectrum.grad-dawn {
  background-image: var(--gradient-dawn);
}

.accent-spectrum.grad-flora {
  background-image: var(--gradient-flora);
}

.accent-spectrum.grad-iris {
  background-image: var(--gradient-iris);
}

.accent-spectrum.grad-ember {
  background-image: var(--gradient-ember);
}

.accent-spectrum.grad-spectrum {
  background-image: var(--gradient-spectrum);
}

@media print {
  .accent-spectrum {
    background-image: none;
    -webkit-text-fill-color: currentColor;
    color: var(--text-strong);
  }
}

@media (forced-colors: active) {
  .accent-spectrum {
    background-image: none;
    -webkit-text-fill-color: currentColor;
  }
}

.text-lead {
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text-muted);
}

.mono {
  font-family: var(--font-data);
}

/* ============================================================ Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 22px;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  transition:
    transform var(--dur-base) var(--ease-spring),
    background-color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--brand-blue);
  color: var(--text-on-accent);
}

.btn-primary:hover {
  background: var(--brand-blue-press);
  box-shadow: var(--glow-blue);
}

.btn-warm {
  background: var(--brand-orange);
  color: var(--text-on-accent);
}

.btn-warm:hover {
  background: var(--brand-orange-press);
  box-shadow: var(--glow-orange);
}

.btn-secondary {
  background: var(--surface-card);
  border-color: var(--border-default);
  color: var(--text-strong);
}

.btn-secondary:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.section {
  padding: var(--space-7) 0;
}

/* Alternate section band — same treatment as the process / how-it-works sections */
.section-alt {
  background: var(--surface-sunken);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

/* ============================================================ Nav */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 1000;
  height: var(--nav-h);
  background: var(--surface-nav);
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition:
    background-color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out);
}

/* Spectrum hairline — the brand's synesthetic accent */
.nav::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient-spectrum);
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.brand-mark {
  height: 30px;
  width: auto;
  flex: 0 0 auto;
}

.brand-word {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-strong);
  line-height: 1;
}

.brand-aid {
  color: var(--brand-blue);
}

.brand-bio {
  color: var(--brand-orange);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-body);
}

.nav-links a:hover {
  color: var(--accent);
  background: var(--accent-tint);
}

.nav-links a.nav-cta {
  margin-left: var(--space-2);
  background: var(--brand-blue);
  color: var(--text-on-accent);
  font-weight: 600;
}

.nav-links a.nav-cta:hover {
  background: var(--brand-blue-press);
  color: var(--text-on-accent);
}

.has-submenu {
  position: relative;
}

.submenu {
  list-style: none;
  margin: 0;
  padding: var(--space-2);
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition:
    opacity var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out),
    visibility var(--dur-fast) var(--ease-out);
}

.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.submenu a {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-body);
  white-space: nowrap;
}

.submenu a:hover {
  color: var(--accent);
  background: var(--accent-tint);
}

.theme-switcher {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  background: var(--surface-card);
  box-shadow: var(--shadow-sm);
  gap: 2px;
  flex-wrap: nowrap;
}

.theme-option {
  border: 0;
  background: transparent;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  transition:
    background-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

.theme-option:hover {
  color: var(--text-strong);
}

.theme-option[aria-pressed="true"] {
  color: var(--accent);
  background: var(--accent-tint);
  font-weight: 600;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--border-subtle);
  background: var(--surface-card);
  color: var(--text-strong);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 999;
  background: var(--surface-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-lg);
  padding: var(--space-3) var(--space-4) var(--space-4);
}

.mobile-menu.open {
  display: block;
}

.mobile-menu a {
  display: block;
  padding: 12px var(--space-2);
  font-size: 16px;
  font-weight: 500;
  color: var(--text-strong);
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-menu a:last-child {
  border-bottom: 0;
  margin-top: var(--space-2);
  text-align: center;
}

.hero {
  position: relative;
  padding: calc(var(--nav-h) + var(--space-6)) 0 var(--space-6);
  overflow: clip;
}

.hero::before {
  content: "";
  position: absolute;
  right: -12rem;
  top: -10rem;
  width: 38rem;
  height: 38rem;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(232, 119, 46, 0.1),
    transparent 66%
  );
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  left: -10rem;
  bottom: -12rem;
  width: 36rem;
  height: 36rem;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(46, 75, 223, 0.1),
    transparent 68%
  );
  pointer-events: none;
}

.hero-desc {
  margin: var(--space-4) 0 var(--space-5);
  max-width: 56ch;
  font-size: 18px;
  line-height: 1.6;
  color: var(--text-muted);
}

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

/* ============================================================ Footer */
.footer {
  background: var(--ink-950);
  color: var(--ink-300);
  font-size: 14px;
  padding: var(--space-6) 0 var(--space-4);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: var(--space-5);
  flex-wrap: wrap;
  padding-bottom: var(--space-5);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.footer-brand img {
  height: 26px;
  width: auto;
}

.footer-brand .brand-word {
  font-size: 20px;
}

.footer-blurb {
  margin: 0;
  max-width: 34ch;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-400);
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-col-h {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-500);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.footer-col a {
  font-size: 13.5px;
  color: var(--ink-300);
}

.footer-col a:hover {
  color: #fff;
}

.footer-bar {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
  padding-top: var(--space-4);
  border-top: 1px solid var(--ink-900);
  font-size: 12.5px;
  color: var(--ink-500);
}

/* ============================================================ Reveal */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--dur-slower) var(--ease-out),
    transform var(--dur-slower) var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 {
  transition-delay: 80ms;
}

.delay-2 {
  transition-delay: 160ms;
}

/* ============================================================ Local sub-nav
   Page-family navigation (portfolio chapters, AidWeather sections).
   Sits directly under the fixed header; the header itself never changes. */
body.has-subnav {
  padding-top: var(--nav-h);
}

body.has-subnav .hero {
  padding-top: var(--space-6);
}

html {
  scroll-padding-top: calc(var(--nav-h) + 12px);
}

html:has(body.has-subnav) {
  scroll-padding-top: calc(var(--nav-h) + var(--subnav-h) + 12px);
}

.subnav {
  position: sticky;
  top: var(--nav-h);
  z-index: 900;
  height: var(--subnav-h);
  background: var(--surface-nav);
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.subnav-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: 100%;
}

.subnav-label {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.subnav-links {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.subnav-links::-webkit-scrollbar {
  display: none;
}

.subnav-links a {
  flex: 0 0 auto;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--text-body);
}

.subnav-links a:hover {
  color: var(--accent);
  background: var(--accent-tint);
}

.subnav-links a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-tint);
  font-weight: 600;
}

.subnav-links a.subnav-ext {
  margin-left: auto;
}

/* Theme switcher lives in the top bar on wide screens and moves into the
   mobile menu on phones, so the logo + wordmark are never squeezed. */
.mobile-menu {
  max-height: calc(100vh - var(--nav-h));
  max-height: calc(100dvh - var(--nav-h));
  overflow-y: auto;
}

.mobile-menu .theme-switcher {
  margin-top: var(--space-3);
}

.mobile-menu .theme-switcher:not(.lang-switcher) {
  display: none;
}

.mobile-menu a.mobile-sublink {
  padding-left: var(--space-4);
  font-size: 14px;
}

/* Current-page marker in the main header (e.g. Founder on the portfolio) */
.nav-links a[aria-current="page"],
.nav-links a[aria-current="true"],
.submenu a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-tint);
}

/* Footer note slot (per-page provenance / licence line) */
.footer-note {
  margin: 0;
  padding: var(--space-3) 0 var(--space-4);
  max-width: 72ch;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-400);
}

.footer-note a {
  color: var(--ink-300);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer-note a:hover {
  color: #fff;
}

/* ============================================================ Figures
   One figure treatment for every page: card surface, 18px radius,
   soft shadow, mono caption. */
.figure {
  margin: 0;
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.figure img,
.figure svg {
  display: block;
  width: 100%;
  height: auto;
}

.figure-media {
  padding: var(--space-4);
  background: var(--surface-card);
}

.figure figcaption {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border-subtle);
  background: var(--surface-sunken);
  font-family: var(--font-data);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
}

/* ============================================================ Responsive (chrome) */
@media (max-width: 880px) {
  .nav-links {
    display: none;
  }

  .nav-actions .lang-switcher {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }
}

@media (max-width: 780px) {
  .hero {
    padding-top: calc(var(--nav-h) + var(--space-5));
  }

  body.has-subnav .hero {
    padding-top: var(--space-5);
  }
}

@media (max-width: 560px) {
  :root {
    --nav-h: 68px;
    --subnav-h: 48px;
  }

  .nav-actions > .theme-switcher:not(.lang-switcher) {
    display: none;
  }

  .mobile-menu .theme-switcher:not(.lang-switcher) {
    display: inline-flex;
  }

  .brand-word {
    font-size: 19px;
  }

  .theme-option {
    padding: 5px 9px;
    font-size: 12px;
  }

  .subnav-label {
    display: none;
  }

  /* Long button labels wrap instead of overflowing 320px screens */
  .btn {
    white-space: normal;
    text-align: center;
  }

  .footer-top {
    flex-direction: column;
    gap: var(--space-4);
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}