/* ------------------------------------------------------------------
   MLED.ME — design tokens + components
   Dark-first. Light theme lives under [data-theme="light"].
   ------------------------------------------------------------------ */

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

html,
body,
h1, h2, h3, h4,
p, figure, blockquote, dl, dd {
  margin: 0;
}

img {
  max-width: 100%;
  display: block;
}

/* ---------- Design tokens ---------- */
:root {
  /* dark palette (default) */
  --bg: #0E1018;
  --surface: #161A28;
  --surface-2: #1E2438;
  --border: #262C40;
  --text: #E8EAF2;
  --text-muted: #A6ADC8;
  --brand: #2A3A7C;
  --accent: #7C8CFF;
  --accent-hover: #9AA7FF;
  --focus: #7C8CFF;
  --logo-chip-bg: #F4F5FA;
  --logo-chip-shadow: 0 1px 3px rgb(0 0 0 / 0.35);
  color-scheme: dark;

  /* spacing scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;

  --measure: 65ch;
  --header-height: 72px;
}

html[data-theme="light"] {
  --bg: #F7F8FC;
  --surface: #FFFFFF;
  --surface-2: #EEF0F8;
  --border: #DADEEE;
  --text: #1B2140;
  --text-muted: #545B7A;
  --brand: #2A3A7C;
  --accent: #2A3A7C;
  --accent-hover: #1E2C63;
  --focus: #2A3A7C;
  --logo-chip-bg: transparent;
  --logo-chip-shadow: none;
  color-scheme: light;
}

/* No-JS fallback: honour OS preference before the toggle script has run */
@media (prefers-color-scheme: light) {
  html:not([data-theme]) {
    --bg: #F7F8FC;
    --surface: #FFFFFF;
    --surface-2: #EEF0F8;
    --border: #DADEEE;
    --text: #1B2140;
    --text-muted: #545B7A;
    --brand: #2A3A7C;
    --accent: #2A3A7C;
    --accent-hover: #1E2C63;
    --focus: #2A3A7C;
    --logo-chip-bg: transparent;
    --logo-chip-shadow: none;
    color-scheme: light;
  }
}

/* ---------- Base ---------- */
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: clamp(1rem, 0.95rem + 0.4vw, 1.125rem);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 700;
}

h1 {
  font-size: clamp(2rem, 1.6rem + 2.5vw, 3rem);
}

h2 {
  font-size: clamp(1.5rem, 1.3rem + 1.2vw, 2rem);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

p {
  margin-bottom: var(--space-3);
}

ul, ol {
  margin: 0 0 var(--space-3);
  padding-left: 1.3em;
}

li {
  margin-bottom: var(--space-2);
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Keep focused elements clear of the header (SC 2.4.11) */
:focus-visible {
  scroll-margin-top: calc(var(--header-height) + var(--space-3));
}

/* ---------- Motion ---------- */
* {
  transition: none;
}

@media (prefers-reduced-motion: no-preference) {
  .theme-toggle,
  .theme-toggle svg {
    transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
  }
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -100px;
  background: var(--surface);
  color: var(--text);
  padding: var(--space-2) var(--space-3);
  border: 2px solid var(--focus);
  border-radius: 6px;
  z-index: 100;
}

.skip-link:focus {
  top: var(--space-3);
}

/* ---------- Layout ---------- */
.wrap {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ---------- Header ---------- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  min-height: var(--header-height);
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.logo-link {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
}

.logo-chip {
  display: inline-flex;
  align-items: center;
  background: var(--logo-chip-bg);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  box-shadow: var(--logo-chip-shadow);
}

.logo-chip img {
  display: block;
  height: 32px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.site-nav ul {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--accent);
}

/* ---------- Theme toggle ---------- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-moon {
  display: none;
}

html[data-theme="light"] .theme-toggle .icon-sun {
  display: none;
}

html[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

/* ---------- Hero (home) ---------- */
.hero {
  padding: var(--space-7) 0 var(--space-6);
}

.hero p {
  max-width: var(--measure);
  color: var(--text-muted);
  font-size: clamp(1.05rem, 1rem + 0.3vw, 1.25rem);
}

.hero .tagline {
  color: var(--text);
  font-size: clamp(1.15rem, 1.05rem + 0.5vw, 1.4rem);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

/* ---------- Main content / article ---------- */
.article {
  padding: var(--space-6) 0 var(--space-7);
}

.page-header h1,
.hero h1 {
  max-width: var(--measure);
}

.page-header {
  margin-bottom: var(--space-5);
}

.byline {
  color: var(--text-muted);
  font-size: 0.95em;
  margin-top: var(--space-2);
}

.prose {
  max-width: var(--measure);
}

.prose > * {
  max-width: var(--measure);
}

/* ---------- Blockquote / pull-quote ---------- */
blockquote {
  margin: var(--space-5) 0;
  padding: var(--space-4) var(--space-4);
  background: var(--surface-2);
  border-left: 4px solid var(--brand);
  border-radius: 4px;
  font-style: italic;
  color: var(--text);
}

blockquote p:last-child {
  margin-bottom: 0;
}

.prose > blockquote {
  max-width: none;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-5) 0;
  color: var(--text-muted);
  font-size: 0.9em;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: space-between;
  align-items: center;
}

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

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

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .wrap {
    padding: 0 var(--space-3);
  }

  .site-header .wrap {
    justify-content: center;
  }

  .site-nav {
    justify-content: center;
  }
}