/* Field Notes (blog) in the homepage's visual language. Scoped to body.field-notes,
   layered over blog.css. Motion states only apply under body.fn-motion, which the
   field-notes controller sets (never under reduced motion). */

body.field-notes {
  --fn-bg: #030305;
  --fn-fg: #f2efe8;
  --fn-dim: rgba(242, 239, 232, 0.6);
  --fn-faint: rgba(242, 239, 232, 0.1);
  --fn-panel: rgba(242, 239, 232, 0.028);
  --fn-sans: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --fn-serif: "Instrument Serif", ui-serif, Georgia, serif;
  --fn-mono: "JetBrains Mono", ui-monospace, monospace;
  --fn-ease: cubic-bezier(0.16, 1, 0.3, 1);
  --fn-gutter: clamp(16px, 4vw, 56px);
  background: var(--fn-bg);
  color: var(--fn-fg);
  overflow-x: hidden;
}

body.field-notes::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

body.field-notes main.container {
  position: relative;
  max-width: none;
  padding: 0;
}

/* blog.css centers with transform, which would trap the fixed hero canvas; use margins. */
body.field-notes .blog-index,
body.field-notes .blog-article-page {
  --blog-bg: var(--fn-bg);
  --blog-panel: var(--fn-panel);
  --blog-panel-raised: rgba(242, 239, 232, 0.05);
  --blog-border: var(--fn-faint);
  --blog-ink: var(--fn-fg);
  --blog-muted: var(--fn-dim);
  position: relative;
  z-index: 1;
  width: min(1320px, calc(100vw - 2 * var(--fn-gutter)));
  margin: 0 auto;
  transform: none;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

/* HUD */
.fn-hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(var(--fn-gutter) * 0.55) var(--fn-gutter) calc(var(--fn-gutter) * 0.9);
  /* Readable over long-form text (the homepage's difference blend turns to mush here). */
  background: linear-gradient(to bottom, rgba(3, 3, 5, 0.94) 0%, rgba(3, 3, 5, 0.72) 55%, rgba(3, 3, 5, 0) 100%);
  color: #fff;
}

.fn-logo {
  display: inline-flex;
  align-items: center;
  color: #fff;
  font: 700 1.15rem/1 var(--fn-sans);
  letter-spacing: -0.04em;
  text-decoration: none;
}

.fn-caret {
  width: 0.5em;
  height: 0.95em;
  margin-left: 0.12em;
  background: currentColor;
  animation: fn-blink 1.05s steps(1) infinite;
}

@keyframes fn-blink { 50% { opacity: 0; } }

.fn-nav { display: flex; gap: clamp(0.9rem, 2.4vw, 2.2rem); }

.fn-nav-link {
  position: relative;
  padding: 0.5rem 0;
  color: #fff;
  font: 500 0.72rem/1 var(--fn-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
}

.fn-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.15rem;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.5s var(--fn-ease);
}

.fn-nav-link:hover::after,
.fn-nav-link.is-current::after { transform: scaleX(1); transform-origin: left; }

.fn-cart-count {
  display: inline-grid;
  place-items: center;
  min-width: 1.5em;
  height: 1.5em;
  margin-left: 0.3em;
  border-radius: 999px;
  background: #fff;
  color: #000;
  letter-spacing: 0;
}

/* Hero particle canvas (index only) */
.fn-hero-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0;
}

.fn-hero-canvas.is-live { transition: none; }

/* Type */
body.field-notes :is(.blog-index-hero h1, .blog-collection-hero h1, .blog-article-header h1, .blog-section-heading h2) {
  font-family: var(--fn-sans);
  font-weight: 700;
  letter-spacing: -0.055em;
}

body.field-notes .blog-index-hero h1 > span:not(.fn-word) {
  font-family: var(--fn-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.02em;
}

body.field-notes :is(.blog-index-kicker, .blog-section-kicker, .blog-card-category, .blog-card-meta, .blog-article-breadcrumbs, .blog-article-meta) {
  font-family: var(--fn-mono);
  letter-spacing: 0.2em;
}

body.field-notes .blog-index-hero {
  min-height: min(100svh, 980px);
  padding-top: clamp(7rem, 18vh, 12rem);
  align-content: end;
  border-bottom-color: var(--fn-faint);
}

body.field-notes .blog-index-hero h1 { font-size: clamp(3.2rem, 8vw, 8rem); line-height: 0.9; }
body.field-notes .blog-index-deck { max-width: 640px; }

body.field-notes .blog-index-meta strong {
  font-family: var(--fn-sans);
  font-size: clamp(3rem, 6vw, 5rem);
  letter-spacing: -0.05em;
}

body.field-notes .blog-collection-hero,
body.field-notes .blog-article-header { padding-top: clamp(6.5rem, 14vh, 9rem); }

/* Chips */
body.field-notes .blog-topic-chip {
  position: relative;
  border-color: color-mix(in srgb, var(--category-accent) 55%, transparent);
  background: color-mix(in srgb, var(--category-accent) 6%, transparent);
  transition: background 0.4s var(--fn-ease), box-shadow 0.4s var(--fn-ease), border-color 0.4s;
}

body.field-notes .blog-topic-chip:hover {
  border-color: var(--category-accent);
  background: color-mix(in srgb, var(--category-accent) 22%, transparent);
  box-shadow: 0 0 28px -6px var(--category-accent);
}

/* Cards: glass panels with an accent glow that follows the cursor, and 3D tilt. */
body.field-notes :is(.blog-lead-card, .blog-secondary-card, .blog-post-card, .blog-category-directory-card, .blog-series-directory-card, .blog-continue-series-card, .blog-series-sequence li > a) {
  position: relative;
  border-color: var(--fn-faint);
  border-radius: 22px;
  background: var(--fn-panel);
  transform: perspective(1100px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
  transform-style: preserve-3d;
  transition: transform 0.6s var(--fn-ease), border-color 0.4s, background 0.4s, box-shadow 0.6s var(--fn-ease);
}

body.field-notes :is(.blog-lead-card, .blog-secondary-card, .blog-post-card, .blog-category-directory-card, .blog-series-directory-card, .blog-continue-series-card, .blog-series-sequence li > a)::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 50%), color-mix(in srgb, var(--category-accent, #59c8d8) 22%, transparent), transparent 60%);
  transition: opacity 0.4s;
}

body.field-notes :is(.blog-lead-card, .blog-secondary-card, .blog-post-card, .blog-category-directory-card, .blog-series-directory-card, .blog-continue-series-card, .blog-series-sequence li > a):hover {
  border-color: color-mix(in srgb, var(--category-accent, #59c8d8) 70%, transparent);
  background: rgba(242, 239, 232, 0.045);
  box-shadow: 0 30px 80px -40px color-mix(in srgb, var(--category-accent, #59c8d8) 55%, transparent);
}

body.field-notes :is(.blog-lead-card, .blog-secondary-card, .blog-post-card, .blog-category-directory-card, .blog-series-directory-card, .blog-continue-series-card, .blog-series-sequence li > a):hover::before { opacity: 1; }
body.field-notes .is-tilting { transition: transform 0.12s linear, border-color 0.4s, background 0.4s, box-shadow 0.6s var(--fn-ease); }

body.field-notes :is(.blog-lead-card, .blog-secondary-card, .blog-post-card, .blog-category-directory-card, .blog-series-directory-card, .blog-continue-series-card) img,
body.field-notes .blog-series-sequence li > a img {
  filter: saturate(0.8) brightness(0.86);
  transition: filter 0.6s var(--fn-ease), transform 0.9s var(--fn-ease);
}

body.field-notes :is(.blog-lead-card, .blog-secondary-card, .blog-post-card, .blog-category-directory-card, .blog-series-directory-card, .blog-continue-series-card):hover img,
body.field-notes .blog-series-sequence li > a:hover img {
  filter: saturate(1.08) brightness(1);
  transform: scale(1.04);
}

body.field-notes .blog-post-card-image,
body.field-notes .blog-lead-card,
body.field-notes .blog-secondary-card { overflow: hidden; }

body.field-notes :is(.blog-lead-card, .blog-secondary-card, .blog-post-card, .blog-category-directory-card, .blog-series-directory-card) h3 {
  font-family: var(--fn-sans);
  letter-spacing: -0.035em;
}

/* Archive */
body.field-notes .blog-archive-filters {
  border: 1px solid var(--fn-faint);
  border-radius: 22px;
  background: var(--fn-panel);
  backdrop-filter: none;
}

body.field-notes .blog-archive-filters :is(input, select) {
  border: 1px solid var(--fn-faint);
  border-radius: 12px;
  background: rgba(3, 3, 5, 0.6);
  color: var(--fn-fg);
}

body.field-notes .blog-archive-filters :is(input, select):focus {
  outline: none;
  border-color: #59c8d8;
  box-shadow: 0 0 0 3px rgba(89, 200, 216, 0.2);
}

body.field-notes .blog-archive-filters input[type="submit"] {
  border: 0;
  border-radius: 999px;
  background: var(--fn-fg);
  color: #030305;
  font-family: var(--fn-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
}

/* Article */
body.field-notes .blog-article-hero {
  overflow: hidden;
  border-radius: 28px;
}

body.field-notes .blog-article-hero > img {
  transform: scale(1.06);
  will-change: transform;
}

body.field-notes .blog-content {
  color: rgba(242, 239, 232, 0.86);
  font-size: clamp(1.05rem, 1.2vw, 1.15rem);
  line-height: 1.78;
}

body.field-notes .blog-content :is(h2, h3) {
  font-family: var(--fn-sans);
  letter-spacing: -0.035em;
}

body.field-notes .blog-content a {
  color: var(--fn-fg);
  text-decoration: underline;
  text-decoration-color: var(--category-accent, #59c8d8);
  text-underline-offset: 4px;
}

body.field-notes .blog-content blockquote { border-left-color: var(--category-accent, #59c8d8); }

.fn-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 70;
  height: 3px;
  background: var(--fn-progress, #59c8d8);
  box-shadow: 0 0 12px var(--fn-progress, #59c8d8);
  transform-origin: left;
  transform: scaleX(0);
}

/* Footer */
.fn-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(4rem, 8vw, 7rem);
  padding: clamp(4rem, 9vw, 8rem) var(--fn-gutter) calc(var(--fn-gutter) + env(safe-area-inset-bottom));
  border-top: 1px solid var(--fn-faint);
}

.fn-footer-big {
  margin: 0 0 clamp(2.5rem, 5vw, 4rem);
  color: var(--fn-fg);
  font: 700 clamp(2.4rem, 6.5vw, 6.5rem)/0.9 var(--fn-sans);
  letter-spacing: -0.055em;
}

.fn-footer-big em { font-family: var(--fn-serif); font-weight: 400; letter-spacing: -0.02em; }

.fn-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.8rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--fn-faint);
}

.fn-footer-links a,
.fn-footer-fine {
  color: var(--fn-dim);
  font: 500 0.72rem/1.6 var(--fn-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.3s;
}

.fn-footer-links a:hover { color: var(--fn-fg); }
.fn-footer-fine { margin: 1.4rem 0 0; letter-spacing: 0.1em; }

/* Motion (controller-gated) */
body.fn-motion .fn-reveal {
  opacity: 0;
  translate: 0 32px;
  transition: opacity 0.9s var(--fn-ease), translate 1.1s var(--fn-ease), transform 0.6s var(--fn-ease), border-color 0.4s, background 0.4s, box-shadow 0.6s var(--fn-ease);
  transition-delay: calc(var(--i, 0) * 70ms);
}

body.fn-motion .fn-reveal.is-in { opacity: 1; translate: 0 0; }
body.fn-motion .fn-reveal.is-in.is-tilting { transition-delay: 0s; }

body.fn-motion .fn-split.fn-reveal { opacity: 1; translate: none; }

.fn-split .fn-word {
  display: inline-block;
  overflow: hidden;
  padding-bottom: 0.1em;
  margin-bottom: -0.1em;
  vertical-align: top;
}

.fn-split .fn-word > span { display: inline-block; }

body.fn-motion .fn-split .fn-word > span {
  translate: 0 108%;
  transition: translate 1.1s var(--fn-ease);
  transition-delay: calc(var(--w, 0) * 45ms + 80ms);
}

body.fn-motion .fn-split.is-in .fn-word > span { translate: 0 0; }

@media (max-width: 760px) {
  .fn-nav-link--wide { display: none; }
  body.field-notes .blog-index-hero { min-height: auto; padding-top: 7rem; }
}

@media (prefers-reduced-motion: reduce) {
  .fn-caret { animation: none; }
}