/* ============================================================
   Shared theme for all pages: palette, base type, links, and
   the light/dark toggle button. Page-specific styles live in
   assets/css/home.css and Neighbor2Inverse/style.css.
   Color palette adapted from linear.app
   ============================================================ */

/* ── Fonts ───────────────────────────────────────────────────
   Lato is served from this site (assets/fonts/, SIL Open Font
   License, see OFL.txt) rather than from Google Fonts, so no
   visitor data is sent to a third party. Files are Google's
   latin / latin-ext subsets; the browser only downloads the
   subset a page actually needs.                                */
@font-face {
  font-family: "Lato";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/lato-400-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Lato";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/lato-400-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Lato";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/lato-400-italic-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Lato";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/lato-400-italic-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Lato";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../fonts/lato-700-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Lato";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../fonts/lato-700-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* ── Design tokens ───────────────────────────────────────────
   Light is the default. Dark applies when the toggle sets
   data-theme="dark" on <html> (see assets/js/theme.js), or,
   before the toggle has been used / without JavaScript, when
   the system prefers dark.                                     */
:root {
  --bg:            #ffffff;
  --bg-subtle:     #f8f8f8;
  --bg-hover:      #f4f4f5;
  --text:          #282a30;   /* headings, titles, own name */
  --text-body:     #3c4149;   /* paragraphs, author lists   */
  --muted:         #6f6e77;   /* summaries, labels, footer  */
  --faint:         #86848d;   /* separators                 */
  --rule:          #e9e8ea;
  --ring:          rgba(0, 0, 0, 0.08);
  --link:          #5e6ad2;   /* indigo accent */
  --link-hover:    #282a30;
  --tile-line:     rgba(94, 106, 210, 0.11);
  color-scheme: only light;   /* "only": browsers must not auto-darken it */
}

:root[data-theme="dark"] {
  --bg:            #08090a;
  --bg-subtle:     #0f1011;
  --bg-hover:      #141516;
  --text:          #f7f8f8;
  --text-body:     #d0d6e0;
  --muted:         #8a8f98;
  --faint:         #62666d;
  --rule:          #23252a;
  --ring:          rgba(255, 255, 255, 0.08);
  --link:          #828fff;
  --link-hover:    #f7f8f8;
  --tile-line:     rgba(130, 143, 255, 0.10);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:            #08090a;
    --bg-subtle:     #0f1011;
    --bg-hover:      #141516;
    --text:          #f7f8f8;
    --text-body:     #d0d6e0;
    --muted:         #8a8f98;
    --faint:         #62666d;
    --rule:          #23252a;
    --ring:          rgba(255, 255, 255, 0.08);
    --link:          #828fff;
    --link-hover:    #f7f8f8;
    --tile-line:     rgba(130, 143, 255, 0.10);
    color-scheme: dark;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-body);
  font-family: "Lato", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

a {
  color: var(--link);
  text-decoration: none;
  transition: color 0.15s;
}

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

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

/* ── Light/dark toggle button (each page positions it) ───── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.theme-toggle:focus-visible { border-radius: 8px; }

.theme-toggle svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Show the moon in light mode (click → dark), the sun in dark mode */
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }