/* =========================================================
   Open Your AIs — Editorial Design Tokens
   Tailwind v4 compatible (@theme inline-ready variables)
   ========================================================= */

:root {
  /* ---- Type ---- */
  --font-serif: 'Fraunces', 'GT Super', 'Times New Roman', serif;
  --font-sans: 'IBM Plex Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;

  /* Editorial type scale (clamp-based, fluid) */
  --text-micro: 10px;
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 22px;
  --text-2xl: clamp(28px, 2.4vw, 36px);
  --text-3xl: clamp(36px, 3.4vw, 52px);
  --text-4xl: clamp(48px, 5vw, 80px);
  --text-5xl: clamp(64px, 7vw, 120px);
  --text-monumental: clamp(80px, 12vw, 220px);

  /* ---- Color — Dark (default) ---- */
  --c-bg: #0a0907;
  --c-bg-elev: #13110d;
  --c-bg-inset: #08070500;
  --c-fg: #f4efe6;
  --c-fg-muted: #a8a095;
  --c-fg-dim: #6e685e;
  --c-rule: #2a261f;
  --c-rule-soft: #1a1713;

  --c-accent: oklch(0.72 0.15 55);
  --c-accent-soft: oklch(0.72 0.15 55 / 0.15);

  /* ---- Spacing (editorial rhythm) ---- */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;
  --s-10: 128px;
  --s-11: 192px;
  --s-12: 256px;

  /* ---- Layout ---- */
  --measure-prose: 68ch;
  --measure-narrow: 52ch;
  --gutter: clamp(24px, 5vw, 80px);

  /* ---- Motion ---- */
  --ease-editorial: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-slow: cubic-bezier(0.65, 0, 0.35, 1);
}

[data-theme="light"] {
  --c-bg: #f4efe6;
  --c-bg-elev: #ebe5d9;
  --c-fg: #0a0907;
  --c-fg-muted: #4a463d;
  --c-fg-dim: #8b8578;
  --c-rule: #d6cfbf;
  --c-rule-soft: #e3ddcf;
}

/* ---- Base ---- */
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--c-bg);
  color: var(--c-fg);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'ss01', 'ss02';
  transition: background 600ms var(--ease-editorial), color 600ms var(--ease-editorial);
}
body { overflow-x: hidden; }

::selection { background: var(--c-accent); color: var(--c-bg); }

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 0.95;
  margin: 0;
  font-variation-settings: 'opsz' 144, 'SOFT' 30, 'WONK' 0;
}
h3, h4 { line-height: 1.05; }

p { margin: 0; text-wrap: pretty; }

.mono {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-fg-muted);
}

.rule { height: 1px; background: var(--c-rule); border: 0; width: 100%; }

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: 1680px;
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* ---- Editorial link ---- */
.elink {
  position: relative;
  display: inline-block;
  transition: color 300ms var(--ease-editorial);
}
.elink::after {
  content: '';
  position: absolute;
  left: 0; right: 0;
  bottom: -2px;
  height: 1px;
  background: currentColor;
  transform-origin: left;
  transform: scaleX(1);
  transition: transform 450ms var(--ease-editorial);
}
.elink:hover { color: var(--c-accent); }
.elink:hover::after { transform-origin: right; transform: scaleX(0); }

/* Reveal variant: underline draws in on hover */
.elink-reveal::after { transform: scaleX(0); transform-origin: right; }
.elink-reveal:hover::after { transform: scaleX(1); transform-origin: left; }

/* ---- Marquee ---- */
.marquee {
  display: flex;
  overflow: hidden;
  white-space: nowrap;
  border-block: 1px solid var(--c-rule);
  padding-block: var(--s-5);
  gap: 0;
}
.marquee__track {
  display: flex;
  flex-shrink: 0;
  gap: var(--s-9);
  padding-right: var(--s-9);
  animation: marquee-scroll var(--marquee-dur, 60s) linear infinite;
}
.marquee__item {
  font-family: var(--font-serif);
  font-size: clamp(48px, 7vw, 112px);
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--c-fg);
  display: inline-flex;
  align-items: center;
  gap: var(--s-7);
}
.marquee__item .dot {
  width: 14px; height: 14px; border-radius: 999px; background: var(--c-accent); flex-shrink: 0;
}
.marquee__item--outline {
  color: transparent;
  -webkit-text-stroke: 1px var(--c-fg);
}
@keyframes marquee-scroll {
  from { transform: translate3d(0,0,0); }
  to   { transform: translate3d(-100%,0,0); }
}
.marquee:hover .marquee__track { animation-play-state: paused; }

/* ---- Reveal on scroll ---- */
/* Only hide when JS has marked the page ready AND the element hasn't revealed yet.
   If JS never runs, content stays visible. */
html.js-ready [data-reveal]:not(.is-in) {
  opacity: 0;
  transform: translateY(28px);
}
[data-reveal] {
  transition: opacity 900ms var(--ease-editorial), transform 900ms var(--ease-editorial);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
[data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal="split"] { overflow: hidden; }
html.js-ready [data-reveal="split"]:not(.is-in) .split-line {
  transform: translateY(110%);
}
[data-reveal="split"] .split-line {
  display: block;
  transition: transform 1100ms var(--ease-editorial);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal="split"].is-in .split-line { transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html.js-ready [data-reveal]:not(.is-in),
  html.js-ready [data-reveal="split"]:not(.is-in) .split-line {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ---- Parallax (modern browsers) ---- */
@supports (animation-timeline: view()) {
  .parallax-up {
    animation: parallax-up linear both;
    animation-timeline: view();
    animation-range: entry 0% exit 100%;
  }
  @keyframes parallax-up {
    from { transform: translate3d(0, 8%, 0) scale(1.08); }
    to   { transform: translate3d(0, -8%, 0) scale(1.08); }
  }
  .parallax-down {
    animation: parallax-down linear both;
    animation-timeline: view();
    animation-range: entry 0% exit 100%;
  }
  @keyframes parallax-down {
    from { transform: translate3d(0, -6%, 0); }
    to   { transform: translate3d(0, 6%, 0); }
  }
}

/* ---- Placeholder imagery (striped) ---- */
.ph {
  position: relative;
  background:
    repeating-linear-gradient(135deg,
      rgba(244,239,230,0.05) 0 14px,
      rgba(244,239,230,0.02) 14px 28px),
    linear-gradient(180deg, #1a1813 0%, #0f0d0a 100%);
  color: var(--c-fg-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  isolation: isolate;
}
.ph::before {
  content: attr(data-label);
  position: absolute;
  top: 14px; left: 14px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-fg-muted);
  opacity: 0.75;
}
.ph::after {
  content: '';
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(244,239,230,0.08);
  pointer-events: none;
}
[data-theme="light"] .ph {
  background:
    repeating-linear-gradient(135deg,
      rgba(10,9,7,0.05) 0 14px,
      rgba(10,9,7,0.02) 14px 28px),
    linear-gradient(180deg, #e8e1d1 0%, #d8d0be 100%);
  color: #4a463d;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 18px 28px 18px 32px;
  border-radius: 999px;
  border: 1px solid var(--c-fg);
  font-family: var(--font-sans);
  font-size: 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 380ms var(--ease-editorial);
  background: transparent;
  color: var(--c-fg);
}
.btn:hover {
  background: var(--c-fg);
  color: var(--c-bg);
  padding-right: 36px;
}
.btn .arr { transition: transform 380ms var(--ease-editorial); }
.btn:hover .arr { transform: translateX(4px); }

.btn--filled {
  background: var(--c-fg);
  color: var(--c-bg);
}
.btn--filled:hover { background: var(--c-accent); border-color: var(--c-accent); color: var(--c-bg); }

/* ---- Focus ---- */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---- Scrollbar (subtle) ---- */
html { scrollbar-color: var(--c-rule) transparent; scrollbar-width: thin; }

/* ---- Reading progress ---- */
.progress {
  position: fixed;
  inset: 0 auto auto 0;
  right: 0;
  height: 2px;
  background: transparent;
  z-index: 80;
}
.progress__fill {
  height: 100%;
  background: var(--c-accent);
  width: 0%;
  transition: width 120ms linear;
}

/* ---- Top nav ---- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 70;
  padding: 24px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: color-mix(in oklab, var(--c-bg) 70%, transparent);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid color-mix(in oklab, var(--c-rule) 50%, transparent);
}
.nav__brand {
  font-family: var(--font-serif);
  font-size: 22px;
  letter-spacing: -0.02em;
  display: flex; align-items: center; gap: 10px;
}
.nav__brand .glyph {
  width: 28px; height: 28px; border-radius: 999px;
  border: 1px solid var(--c-fg);
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 11px;
}
.nav__links {
  display: flex; gap: var(--s-7);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.nav__links a { position: relative; padding: 6px 0; }
.nav__links a::after {
  content: ''; position: absolute; inset: auto 0 0 0; height: 1px; background: var(--c-fg);
  transform: scaleX(0); transform-origin: right; transition: transform 360ms var(--ease-editorial);
}
.nav__links a:hover::after,
.nav__links a[aria-current="page"]::after { transform: scaleX(1); transform-origin: left; }

/* ---- Footer ---- */
.ft {
  padding: var(--s-9) var(--gutter) var(--s-6);
  border-top: 1px solid var(--c-rule);
  margin-top: var(--s-10);
}
.ft__mono {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--c-fg-muted);
}
.ft__giant {
  font-family: var(--font-serif);
  font-size: clamp(80px, 16vw, 260px);
  letter-spacing: -0.04em;
  line-height: 0.85;
  margin-top: var(--s-7);
  white-space: nowrap;
  overflow: hidden;
}

/* ---- Prose (blog post) ---- */
.prose {
  font-family: var(--font-sans);
  font-size: 19px;
  line-height: 1.65;
  color: var(--c-fg);
  max-width: var(--measure-prose);
  margin-inline: auto;
}
.prose > * + * { margin-top: 1.4em; }
.prose p { text-wrap: pretty; }
.prose h2 {
  font-family: var(--font-serif);
  font-size: clamp(32px, 3.2vw, 48px);
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-top: 2.2em;
  margin-bottom: 0.5em;
}
.prose h3 {
  font-family: var(--font-serif);
  font-size: clamp(24px, 2vw, 30px);
  margin-top: 2em;
  margin-bottom: 0.3em;
}
.prose a { border-bottom: 1px solid var(--c-fg-muted); transition: all 300ms var(--ease-editorial); }
.prose a:hover { color: var(--c-accent); border-bottom-color: var(--c-accent); }
.prose blockquote {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3vw, 44px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 2em -6ch;
  padding: 0;
  border: 0;
  color: var(--c-fg);
  text-wrap: balance;
}
.prose blockquote::before { content: '"'; font-family: var(--font-serif); }
.prose blockquote::after { content: '"'; font-family: var(--font-serif); }
.prose blockquote cite {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-fg-muted);
  font-style: normal;
  margin-top: 18px;
}
.prose figure { margin: 2.2em 0; }
.prose figure figcaption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-fg-muted);
  margin-top: 12px;
  display: flex; gap: 18px;
}
.prose figure figcaption .n { color: var(--c-accent); }

/* Drop cap */
.prose > p.lead::first-letter,
.prose > p:first-of-type.dropcap::first-letter {
  font-family: var(--font-serif);
  float: left;
  font-size: 6.2em;
  line-height: 0.85;
  padding: 8px 14px 0 0;
  color: var(--c-fg);
  font-weight: 400;
}

.prose .lead {
  font-size: 24px;
  line-height: 1.5;
  font-weight: 300;
  color: var(--c-fg);
  letter-spacing: -0.005em;
}

/* ---- AdSense slot ---- */
.adsense-slot {
  margin: var(--s-8) auto;
  padding: var(--s-5);
  border: 1px dashed var(--c-rule);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-fg-dim);
  max-width: var(--measure-prose);
}

/* ---- Utilities ---- */
.hline {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: var(--s-5);
  padding-block: var(--s-4);
}
.hline hr { border: 0; height: 1px; background: var(--c-rule); width: 100%; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--s-5);
}

.caps {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* Editorial aesthetic — all post imagery in black & white */
.hero__img,
.card__img,
.post-head__img {
  filter: grayscale(1) contrast(1.03);
  transition: filter 600ms var(--ease-editorial);
}