/* Default theme = Light */
:root {
  --bg: #ffffff;
  --fg: #0f172a;
  /* near-black */
  --muted: #334155;
  /* darker slate for readability */
  --accent: #2563eb;
  --card: #ffffff;
  --border: #e5e7eb;
}

/* Dark theme (enabled when .theme-dark class is on <html>) */
:root.theme-dark {
  --bg: #0b0b0d;
  --fg: #e7e7ea;
  --muted: #a6a6ad;
  --accent: #7aa2ff;
  --card: #141418;
  --border: #2a2a33;
}

/* Subtle surfaces & pill colors that adapt to theme */
:root {
  --surface-1: color-mix(in srgb, var(--fg) 6%, var(--bg));
  --surface-2: color-mix(in srgb, var(--fg) 12%, var(--bg));
  --pill-bg: color-mix(in srgb, var(--accent) 18%, var(--card));
  --pill-bd: color-mix(in srgb, var(--accent) 28%, var(--border));
}

:root.theme-dark {
  --surface-1: color-mix(in srgb, var(--fg) 8%, var(--bg));
  --surface-2: color-mix(in srgb, var(--fg) 14%, var(--bg));
  --pill-bg: color-mix(in srgb, var(--accent) 22%, var(--card));
  --pill-bd: color-mix(in srgb, var(--accent) 32%, var(--border));
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 1px 12px color-mix(in srgb, var(--fg) 6%, transparent);
}


/* === Header (final mobile-ready) === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: var(--surface-1);
  border-bottom: 1px solid color-mix(in srgb, var(--fg) 10%, var(--bg));
}

/* Bar height is explicit (no vertical padding). */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 20px;
  height: 60px;
  flex-wrap: nowrap;
}

/* Keep dropdowns above page content and not clipped */
.site-header,
.nav.container {
  position: relative;
  z-index: 1000;
  overflow: visible !important;
}

/* Brand: logo = bar height */
.brand {
  display: flex;
  align-items: center;
  height: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  height: 100%;
  text-decoration: none;
  color: inherit;
}

.brand-logo {
  max-height: 100%;
  width: auto;
  display: block;
}

/* Desktop menu */
.menu {
  display: flex;
  gap: 14px;
  align-items: center;
}

.menu a,
.menu button {
  color: var(--fg);
  text-decoration: none;
  background: none;
  border: none;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  font: inherit;
}

.menu a:hover,
.menu button:hover {
  background: var(--card);
}

/* Dropdowns (desktop hover + mobile via .open) */
.dropdown {
  position: relative;
}

.dropdown-panel {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  display: none;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
  z-index: 9999;
  margin: 0;
}

.dropdown:hover .dropdown-panel,
.dropdown:focus-within .dropdown-panel,   /* add this */
.dropdown.open .dropdown-panel {
  display: block;
}

.dropdown-panel a {
  display: block;
  padding: 10px 12px;
  color: var(--fg);
  border-radius: 8px;
}

.dropdown-panel a small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.dropdown-panel a:hover {
  background: color-mix(in srgb, var(--fg) 8%, var(--bg));
}

/* Hamburger (hidden on desktop) */
.nav-toggle {
  display: none;
}

/* ===== Mobile ===== */
@media (max-width: 720px) {
  .nav {
    height: 56px;
    padding: 0 12px;
    gap: 8px;
  }

  /* show hamburger */
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--pill-bd);
    background: var(--pill-bg);
    color: var(--fg);
    font-size: 20px;
    line-height: 1;
  }

  /* collapse menu by default; open when html.nav-open is set by JS */
  .menu {
    position: absolute;
    left: 0;
    right: 0;
    top: 56px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 8px 12px 12px;
    background: var(--surface-1);
    border-bottom: 1px solid color-mix(in srgb, var(--fg) 10%, var(--bg));
  }

  html.nav-open .menu {
    display: flex;
  }

  .menu a,
  .menu button {
    padding: 12px;
    border-radius: 8px;
    text-align: left;
  }

  /* dropdowns flow in the column (tap to open adds .open) */
  .dropdown {
    position: static;
  }

  .dropdown-panel {
    position: static;
    display: none;
    margin-top: -4px;
    padding: 6px;
    border-radius: 10px;
    border: 1px solid var(--border);
    box-shadow: none;
  }

  .dropdown.open .dropdown-panel {
    display: block;
  }
}

/* --- Global safe bits you can keep elsewhere --- */
html,
body {
  overflow-x: hidden;
}

img,
video,
canvas,
svg {
  max-width: 100%;
  height: auto;
}

pre {
  max-width: 100%;
  overflow: auto;
}

table {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  display: block;
}


/* Filled pill theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--pill-bg);
  color: var(--fg);
  border: 1px solid var(--pill-bd);
  border-radius: 999px;
  /* pill */
  cursor: pointer;
  font: inherit;
  box-shadow: 0 1px 0 color-mix(in srgb, var(--fg) 8%, transparent);
  transition: transform 120ms ease, box-shadow 120ms ease, filter 120ms ease;
}

.theme-toggle:hover {
  filter: brightness(1.03);
  box-shadow: 0 2px 10px color-mix(in srgb, var(--fg) 10%, transparent);
}

.theme-toggle:active {
  transform: translateY(1px);
}

.theme-toggle:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 2px;
}

/* keep if you still use the wrapper/label */
.theme-label {
  margin-right: 6px;
  font-size: 0.9em;
  color: var(--fg);
  vertical-align: middle;
}

.theme-control {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Footer */
.site-footer {
  border-top: 1px solid color-mix(in srgb, var(--fg) 10%, var(--bg));
  background: var(--surface-1);
  /* match header surface */
  color: var(--fg);
  padding: 24px 20px;
}

.site-footer .row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.site-footer .row.two {
  grid-template-columns: 1fr 1fr;
}

.site-footer a {
  color: var(--muted);        /* softer than body text */
  font-weight: 500;           /* semi-bold so links stand out a bit */
  text-decoration: none;      /* keep clean */
  transition: color 0.2s ease;
}

.site-footer a:hover {
  color: var(--accent);       /* brighter accent color on hover */
}

/* Footer grid fix for mobile */
@media (max-width: 720px) {
  .site-footer .row.two {
    grid-template-columns: 1fr;
  }
}


/* Newsletter */
.newsletter {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  /* allow button to move to next line */
}

.newsletter input[type=email] {
  flex: 1 1 240px;
  /* grow but can shrink */
  min-width: 0;
  /* prevents overflow */
  padding: 10px 12px;
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.newsletter button {
  flex: 0 0 auto;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  font-weight: 600;
}

.newsletter button:hover {
  filter: brightness(1.05);
}

/* On very narrow phones, button full width */
@media (max-width: 420px) {
  .newsletter button {
    width: 100%;
  }
}


/* Main content helpers */
.prose h1 {
  font-size: 32px;
  margin: 18px 0 12px;
}

.prose h2 {
  font-size: 22px;
  margin-top: 18px;
}

.prose p,
.prose li {
  color: var(--fg);
}

/* readable in both themes */
.prose small,
.prose .muted {
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 16px;
}

.grid.cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 800px) {
  .grid.cols-3 {
    grid-template-columns: 1fr;
  }
}

/* Newsletter form styles */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 1px, 1px);
  white-space: nowrap;
  border: 0;
}

form.newsletter {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .5rem;
  max-width: 520px;
}

form.newsletter input[type="text"],
form.newsletter input[type="email"] {
  grid-column: 1 / -1;
  padding: .6rem .7rem;
  border: 1px solid var(--border, #e5e7eb);
  border-radius: .5rem;
}

form.newsletter button[disabled] {
  opacity: .6;
  cursor: default;
}

.nl-msg {
  font-size: .9rem;
  margin: .25rem 0 0;
  grid-column: 1 / -1;
}

.nl-msg[data-state="ok"] {
  color: #0a7f2e;
}

.nl-msg[data-state="error"] {
  color: #b00020;
}

.nl-msg[data-state="pending"] {
  color: #6b7280;
}

/* Force the grid-form submit button to be filled, in both themes */
form.newsletter button[type="submit"],
/* also apply to the flex version for consistency */
.newsletter button {
  justify-self: start;
  padding: 10px 14px;
  border-radius: .5rem;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  background: var(--accent);
  color: #fff;
  /* readable on your blue accent in light & dark */
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 1px 6px color-mix(in srgb, var(--fg) 12%, transparent);
  transition: filter .15s ease, transform .05s ease, box-shadow .15s ease;
}

form.newsletter button[type="submit"]:hover,
.newsletter button:hover {
  filter: brightness(1.05);
  box-shadow: 0 3px 14px color-mix(in srgb, var(--fg) 16%, transparent);
}

form.newsletter button[type="submit"]:active,
.newsletter button:active {
  transform: translateY(1px);
}

form.newsletter button[disabled],
.newsletter button[disabled] {
  opacity: .6;
  cursor: default;
  filter: none;
  box-shadow: none;
}