/* =============================================================
   css/theme.css
   Shared design tokens and layout primitives.
   Linked by all HTML pages on both domains (main and sub).
   ============================================================= */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;1,300;1,400&family=Karla:wght@300;400;500&display=swap');

/* Design tokens: light (default) */
:root {
  --bg:           #ffffff;
  --text:         #1a1a1a;
  --subtext:      #555555;
  --meta:         #888888;
  --accent:       #00bcd4;
  --accent-dim:   rgba(0, 188, 212, 0.16);
  --line-color:   rgba(0, 188, 212, 0.72);
  --card-bg:      rgba(255, 255, 255, 0.88);
  --border:       rgba(0, 0, 0, 0.08);
  --link:         #1a1a1a;

  /* Content column width — guide lines anchor to this */
  --col-width: 680px;
  /* Gap between guide line and the content edge */
  --line-gap: 18px;
}

/* Design tokens: dark */
[data-theme="dark"] {
  --bg:           #0d0d0d;
  --text:         #f0f0f0;
  --subtext:      #aaaaaa;
  --meta:         #666666;
  --accent:       #00e5ff;
  --accent-dim:   rgba(0, 229, 255, 0.10);
  --line-color:   rgba(0, 229, 255, 0.65);
  --card-bg:      rgba(20, 20, 20, 0.92);
  --border:       rgba(255, 255, 255, 0.08);
  --link:         #f0f0f0;
}

/* ── Reset ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  min-height: 100%;
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Karla', sans-serif;
  font-weight: 300;
  line-height: 1.6;
  transition: background-color 0.35s ease, color 0.35s ease;
}

/* Theme toggle button — fixed top-left, present on every page */
#theme-toggle {
  position: fixed;
  top: 14px;
  left: 18px;
  z-index: 300;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 32px;
  padding: 0;
  opacity: 0.65;
  transition: opacity 0.2s;
}
#theme-toggle:hover { opacity: 1; }
#theme-toggle img {
  width: 28px;
  height: 28px;
  display: block;
}

/* Cyan guide lines — fixed vertically, desktop only */
/*
  They sit var(--line-gap) outside the content column edges,
  40px from top and bottom so as to never touch the viewport edge.
*/
.guide-line {
  position: fixed;
  top: 40px;
  bottom: 40px;
  width: 1.5px;
  background: var(--line-color);
  z-index: 10;
  pointer-events: none;
  transition: background 0.35s;
}
.guide-line-left {
  left: calc((100vw - var(--col-width)) / 2 - var(--line-gap));
}
.guide-line-right {
  right: calc((100vw - var(--col-width)) / 2 - var(--line-gap));
}

/* Hide (cyan) guide lines when viewport is too narrow to make sense */
@media (max-width: 820px) {
  .guide-line { display: none; }
}

/* Shared typography helpers */
h1, h2, h3, h4 {
  font-family: 'Cormorant Garamond', serif;
  color: var(--text);
  transition: color 0.35s;
}

/* Thin cyan divider */
.divider {
  width: 52px;
  height: 1px;
  background: var(--accent);
  opacity: 0.45;
}

/* Small uppercase nav / back link */
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--accent);
  transition: opacity 0.2s;
}
.nav-link:hover { opacity: 0.65; }

/* Outline button */
.btn-outline {
  display: inline-block;
  padding: 10px 30px;
  border: 1.5px solid var(--accent);
  border-radius: 4px;
  text-decoration: none;
  color: var(--accent);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
  transition: background 0.22s, color 0.22s;
}
.btn-outline:hover {
  background: var(--accent);
  color: #fff;
}

/* Footer */
footer {
  text-align: center;
  padding: 28px 24px;
  font-size: 0.76rem;
  color: var(--subtext);
  opacity: 0.55;
}