/* === Fund Your Internet — Visual Enhancements === */
/* Theme toggle, icons, hero treatments, figure shortcode */

/* --- Theme toggle --- */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: none;
  border: 1px solid var(--colour-border);
  border-radius: 4px;
  padding: 0.3em 0.6em;
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--colour-muted);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
  line-height: 1;
}

.theme-toggle:hover {
  color: var(--colour-text);
  border-color: var(--colour-text);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--colour-link);
  outline-offset: 2px;
}

.theme-toggle-icon {
  width: 0.9em;
  height: 0.9em;
  flex-shrink: 0;
}

/* --- Section icons --- */

.section-icon {
  width: 1.2em;
  height: 1.2em;
  vertical-align: -0.15em;
  display: inline-block;
}

.strand-label .section-icon,
.bridge-section .section-icon {
  width: 1em;
  height: 1em;
  vertical-align: -0.1em;
}

h1 .section-icon {
  width: 1em;
  height: 1em;
  vertical-align: -0.05em;
}

/* --- Section navigation bar (below hero) --- */

.section-nav-bar {
  border-bottom: 1px solid var(--colour-border);
  background: var(--colour-subtle);
}

.section-nav-bar ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: center;
  gap: var(--space-xs);
}

.section-nav-bar li {
  display: contents;
}

.section-nav-link {
  display: flex;
  align-items: center;
  gap: 0.35em;
  padding: 0.6rem var(--space-sm);
  font-size: 0.85rem;
  color: var(--colour-muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.section-nav-link:visited {
  color: var(--colour-muted);
}

.section-nav-link:hover {
  color: var(--colour-text);
}

.section-nav-link:focus-visible {
  outline: 2px solid var(--colour-link);
  outline-offset: 2px;
}

.section-nav-link .section-icon {
  width: 1em;
  height: 1em;
  vertical-align: -0.1em;
  opacity: 0.7;
}

.section-nav-link--one-thing:hover,
.section-nav-link--one-thing[aria-current="page"] {
  color: var(--colour-text);
  border-bottom-color: var(--colour-text);
}

.section-nav-link--old-way:hover,
.section-nav-link--old-way[aria-current="page"] {
  color: var(--colour-feeds);
  border-bottom-color: var(--colour-feeds);
}

.section-nav-link--new-way:hover,
.section-nav-link--new-way[aria-current="page"] {
  color: var(--colour-movement);
  border-bottom-color: var(--colour-movement);
}

.section-nav-link--evidence:hover,
.section-nav-link--evidence[aria-current="page"] {
  color: var(--colour-evidence);
  border-bottom-color: var(--colour-evidence);
}

.section-nav-link[aria-current="page"] .section-icon {
  opacity: 1;
}

/* --- Section hero (photo + desaturated gradient fade) --- */

.section-hero {
  padding: calc(var(--space-2xl) + 3rem) var(--space-md) var(--space-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.section-hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-xs);
}

.section-hero .section-hero-subtitle {
  font-size: 1.1rem;
  color: var(--colour-muted);
  max-width: 36rem;
  margin: 0 auto;
}

.section-hero--old-way h1 { color: var(--colour-feeds); }
.section-hero--new-way h1 { color: var(--colour-movement); }
.section-hero--evidence h1 { color: var(--colour-evidence); }

/* --- Homepage hero backdrop --- */

.homepage-hero {
  padding: calc(var(--space-lg) + 3rem) 0 0;
  position: relative;
  overflow: hidden;
}

.homepage-hero .container {
  padding-bottom: var(--space-lg);
}

/* --- Hero image layers (shared) --- */

.section-hero::before,
.homepage-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  filter: grayscale(30%);
  opacity: 0.7;
}

.section-hero::after,
.homepage-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 10%, var(--colour-bg) 100%);
}

.section-hero > *,
.homepage-hero > * {
  position: relative;
  z-index: 1;
}

/* Per-hero image assignments */

.homepage-hero::before { background-image: url("/images/hero/homepage.jpg"); }
.section-hero--old-way::before { background-image: url("/images/hero/old-way.jpg"); }
.section-hero--new-way::before { background-image: url("/images/hero/new-way.jpg"); }
.section-hero--evidence::before { background-image: url("/images/hero/evidence.jpg"); }

/* Section-tinted gradient overlays */

.section-hero--old-way::after {
  background: linear-gradient(to bottom,
    color-mix(in srgb, var(--colour-feeds-light) 20%, transparent) 0%,
    var(--colour-bg) 100%);
}

.section-hero--new-way::after {
  background: linear-gradient(to bottom,
    color-mix(in srgb, var(--colour-movement-light) 20%, transparent) 0%,
    var(--colour-bg) 100%);
}

.section-hero--evidence::after {
  background: linear-gradient(to bottom,
    color-mix(in srgb, var(--colour-evidence-light) 20%, transparent) 0%,
    var(--colour-bg) 100%);
}

/* Hero images — dark mode (explicit toggle) */

html[data-theme="dark"] .section-hero::before,
html[data-theme="dark"] .homepage-hero::before {
  filter: grayscale(50%);
  opacity: 0.35;
}

/* Hero images — dark mode (OS detection) */

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .section-hero::before,
  html:not([data-theme="light"]) .homepage-hero::before {
    filter: grayscale(80%);
    opacity: 0.2;
  }
}

/* --- Figure shortcode --- */

.content-figure {
  margin: var(--space-lg) 0;
  position: relative;
}

.content-figure img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
}

.content-figure figcaption {
  font-size: 0.85rem;
  color: var(--colour-muted);
  margin-top: var(--space-xs);
}

.content-figure-icon {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-sm);
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--colour-bg);
  border-radius: 50%;
  opacity: 0.9;
  color: var(--colour-branch);
}

.content-figure-icon .section-icon {
  width: 1.4em;
  height: 1.4em;
}

/* --- Responsive hero --- */

@media (min-width: 48em) {
  .section-hero h1 {
    font-size: 3rem;
  }
}

/* --- Print: hide hero image layers --- */

@media print {
  .section-hero::before,
  .section-hero::after,
  .homepage-hero::before,
  .homepage-hero::after {
    display: none;
  }
}