/* === Fund Your Internet — Base Styles === */

/* --- Custom properties --- */

:root {
  --colour-text: #1a1a1a;
  --colour-bg: #fafaf8;
  --colour-subtle: #f0efeb;
  --colour-border: #d4d2cb;
  --colour-muted: #5c5c5c;
  --colour-link: #1a4d8f;
  --colour-link-visited: #5b2182;
  --colour-link-hover: #0d3366;
  --colour-error: #c0392b;

  /* Branch colours — wayfinding system */
  --colour-feeds: #1b7a6f;       /* teal — analytical, explanatory */
  --colour-feeds-light: #e6f4f2;
  --colour-feeds-border: #b0d9d3;
  --colour-movement: #a8621a;    /* amber/ochre — community, warmth */
  --colour-movement-light: #faf0e4;
  --colour-movement-border: #e0c5a0;
  --colour-evidence: #4a5e80;    /* slate blue — archival, scholarly */
  --colour-evidence-light: #eaeef4;
  --colour-evidence-border: #b5c2d6;

  /* Active branch (set per-page via template) */
  --colour-branch: var(--colour-link);
  --colour-branch-light: var(--colour-subtle);
  --colour-branch-border: var(--colour-border);

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-heading: Georgia, "Times New Roman", serif;
  --max-width: 42rem;
  --max-width-wide: 58rem;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --space-2xl: 8rem;
}

/* Dark mode: explicit override via toggle */
html[data-theme="dark"] {
  --colour-text: #e8e6e1;
  --colour-bg: #1a1a1a;
  --colour-subtle: #2a2a28;
  --colour-border: #3d3d3a;
  --colour-muted: #a0a0a0;
  --colour-link: #6eaaef;
  --colour-link-visited: #b89adb;
  --colour-link-hover: #9ec5f5;
  --colour-error: #e74c3c;

  --colour-feeds: #4dc4b7;
  --colour-feeds-light: #1e2e2c;
  --colour-feeds-border: #2d4a46;
  --colour-movement: #d4943e;
  --colour-movement-light: #2e2418;
  --colour-movement-border: #4a3820;
  --colour-evidence: #8a9fc0;
  --colour-evidence-light: #1e2330;
  --colour-evidence-border: #2d3a52;
}

/* Dark mode: OS detection when no explicit preference set */
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --colour-text: #e8e6e1;
    --colour-bg: #1a1a1a;
    --colour-subtle: #2a2a28;
    --colour-border: #3d3d3a;
    --colour-muted: #a0a0a0;
    --colour-link: #6eaaef;
    --colour-link-visited: #b89adb;
    --colour-link-hover: #9ec5f5;
    --colour-error: #e74c3c;

    --colour-feeds: #4dc4b7;
    --colour-feeds-light: #1e2e2c;
    --colour-feeds-border: #2d4a46;
    --colour-movement: #d4943e;
    --colour-movement-light: #2e2418;
    --colour-movement-border: #4a3820;
    --colour-evidence: #8a9fc0;
    --colour-evidence-light: #1e2330;
    --colour-evidence-border: #2d3a52;
  }
}

/* --- Reset --- */

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

body, h1, h2, h3, h4, p, ul, ol, figure, blockquote {
  margin: 0;
}

/* --- Base --- */

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--colour-text);
  background: var(--colour-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Typography --- */

h1, h2, h3 {
  font-family: var(--font-heading);
  line-height: 1.25;
  font-weight: normal;
}

h1 {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

h2 {
  font-size: 1.4rem;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.15rem;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-sm);
}

p + p {
  margin-top: 0;
}

blockquote {
  border-left: 3px solid var(--colour-border);
  padding-left: var(--space-md);
  color: var(--colour-muted);
  margin: var(--space-md) 0;
}

ul, ol {
  padding-left: var(--space-md);
  margin-bottom: var(--space-sm);
}

ul:not([class]) > li + li,
ol > li + li {
  margin-top: var(--space-xs);
}

/* --- Links --- */

a {
  color: var(--colour-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:visited {
  color: var(--colour-link-visited);
}

a:hover {
  color: var(--colour-link-hover);
}

a:focus-visible {
  outline: 2px solid var(--colour-link);
  outline-offset: 2px;
  border-radius: 2px;
}

/* --- Layout --- */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
}

.container--wide {
  max-width: var(--max-width-wide);
}

/* --- Skip link (accessibility) --- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: var(--space-xs) var(--space-sm);
  background: var(--colour-text);
  color: var(--colour-bg);
  z-index: 100;
  font-size: 0.875rem;
}

.skip-link:focus {
  position: static;
  display: inline-block;
}

/* --- Site header --- */

.site-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  padding: var(--space-sm) 0;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--colour-text);
}

.site-title:visited {
  color: var(--colour-text);
}

.site-mark {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: normal;
  letter-spacing: 0.05em;
  background: var(--colour-text);
  color: var(--colour-bg);
  padding: 0.15em 0.35em;
  border-radius: 3px;
  line-height: 1;
}

.site-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: normal;
}

/* --- Site footer --- */

.site-footer {
  border-top: 1px solid var(--colour-border);
  padding: var(--space-lg) 0;
  margin-top: var(--space-xl);
}

.site-footer p {
  font-size: 0.85rem;
  color: var(--colour-muted);
  margin-bottom: var(--space-xs);
}

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

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

/* --- Responsive --- */

@media (min-width: 48em) {
  h1 {
    font-size: 2.25rem;
  }
}

/* --- Print --- */

@media print {
  .section-nav-bar,
  .skip-link,
  .back-link,
  .theme-toggle {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
  }

  .container {
    max-width: none;
    padding: 0;
  }

  .strand,
  .bridge,
  .library-entry {
    background: none;
    border-radius: 0;
  }

  .section-hero,
  .homepage-hero {
    background: none;
    padding-top: var(--space-md);
  }
}