/* ==========================================================
   theme.css — shared design tokens + dark/light theming
   Included by landing, blog, and all sub-pages
   ========================================================== */

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

/* ── DARK THEME (default) ── */
:root, :root[data-theme="dark"] {
  --bg:            #0a0a0a;
  --bg-elevated:   #131313;
  --fg:            #e5e5e5;
  --fg-strong:     #ffffff;
  --mid:           #a3a3a3;
  --dim:           #525252;
  --border:        #262626;
  --border-strong: #404040;
  --red:           #dc2626;  /* Tailwind red-600 */
  --red-hi:        #ef4444;  /* red-500 */
  --red-dim:       #7f1d1d;  /* red-900 */
  --code-bg:       #0f0f0f;
  --overlay:       rgba(0, 0, 0, 0.4);

  color-scheme: dark;
}

/* ── LIGHT THEME ── */
:root[data-theme="light"] {
  --bg:            #fafafa;
  --bg-elevated:   #ffffff;
  --fg:            #171717;
  --fg-strong:     #000000;
  --mid:           #525252;
  --dim:           #a3a3a3;
  --border:        #e5e5e5;
  --border-strong: #d4d4d4;
  --red:           #b91c1c;  /* red-700 */
  --red-hi:        #dc2626;
  --red-dim:       #fecaca;  /* red-200 */
  --code-bg:       #f5f5f5;
  --overlay:       rgba(255, 255, 255, 0.6);

  color-scheme: light;
}

/* ── BASE ── */
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

html, body {
  width: 100%;
  min-height: 100%;
  overflow-x: hidden;
  overflow-x: clip;
  max-width: 100%;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Space Mono', 'Courier New', monospace;
  transition: background 0.2s ease, color 0.2s ease;
  line-height: 1.6;
}

::selection {
  background: var(--red);
  color: var(--fg-strong);
}

/* ── SHARED UTILITIES ── */
.mono { font-family: 'Space Mono', 'Courier New', monospace; }

/* Corner brackets utility (kept as decorative accent) */
.corner-brackets {
  position: relative;
}
.corner-brackets::before,
.corner-brackets::after {
  content: '';
  position: absolute;
  width: 10px;
  height: 10px;
  opacity: 0.6;
  transition: opacity 0.2s;
}
.corner-brackets::before {
  top: 6px; left: 6px;
  border-top: 1px solid var(--red);
  border-left: 1px solid var(--red);
}
.corner-brackets::after {
  bottom: 6px; right: 6px;
  border-bottom: 1px solid var(--red);
  border-right: 1px solid var(--red);
}
.corner-brackets:hover::before,
.corner-brackets:hover::after {
  opacity: 1;
}

/* ── SITE NAV (top bar, shared across all pages) ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.9rem 1.4rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-brand {
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  color: var(--fg-strong);
  text-decoration: none;
  flex-shrink: 0;
  transition: color 0.15s;
}
.site-brand::before {
  content: '›';
  color: var(--red);
  margin-right: 0.4rem;
}
.site-brand:hover { color: var(--red); }

.site-menu {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  flex: 1;
  flex-wrap: wrap;
}

.site-menu a {
  color: var(--mid);
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: lowercase;
  padding: 0.3rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.site-menu a:hover { color: var(--fg-strong); }
.site-menu a[aria-current="page"] {
  color: var(--fg-strong);
  border-bottom-color: var(--red);
}

.site-controls {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-shrink: 0;
}

/* Lang toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
}

.lang-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.25rem 0.4rem;
  font-family: inherit;
  font-size: inherit;
  letter-spacing: inherit;
  text-transform: uppercase;
  color: var(--dim);
  transition: color 0.15s;
  position: relative;
}
.lang-btn.active { color: var(--fg-strong); }
.lang-btn.active::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0.4rem; right: 0.4rem;
  height: 1px;
  background: var(--red);
}
.lang-sep { color: var(--border-strong); font-size: 0.65rem; }

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  cursor: pointer;
  padding: 0.35rem 0.5rem;
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--mid);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  min-height: 28px;
}
.theme-toggle:hover {
  color: var(--fg-strong);
  border-color: var(--border-strong);
}

.theme-icon-dark, .theme-icon-light { display: inline-block; }
:root[data-theme="dark"]  .theme-icon-dark  { display: none; }  /* show sun */
:root[data-theme="light"] .theme-icon-light { display: none; }  /* show moon */

/* Responsive nav */
@media (max-width: 720px) {
  .site-nav-inner {
    gap: 0.8rem;
    padding: 0.7rem 1rem;
    flex-wrap: wrap;
  }
  .site-menu {
    order: 3;
    gap: 1rem;
    width: 100%;
    justify-content: flex-start;
    flex: 0 0 100%;
    padding-top: 0.4rem;
    border-top: 1px solid var(--border);
    margin-top: 0.2rem;
  }
  .site-menu a { font-size: 0.78rem; }
  .site-controls { margin-left: auto; }
}

@media (max-width: 420px) {
  .site-nav-inner { padding: 0.6rem 0.85rem; }
  .site-menu { gap: 0.85rem; }
  .site-menu a { font-size: 0.75rem; }
}

/* Reduce motion honored globally */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}