:root {
  color-scheme: light;
  --bg: #ffffff;
  --bg-alt: #f7f7f4;
  --surface: #ffffff;
  --surface-soft: #f7f7f4;
  --ink: #111111;
  --ink-soft: #303030;
  --muted: #686864;
  --line: rgba(17, 17, 17, 0.12);
  --line-strong: rgba(17, 17, 17, 0.24);
  --accent: #111111;
  --accent-blue: #1573ff;
  --nav-bg: rgba(255, 255, 255, 0.9);
  --shadow: none;
  --shadow-soft: none;
  --radius-xl: 8px;
  --radius-lg: 8px;
  --radius-md: 8px;
  --radius-sm: 6px;
  --ease: 180ms ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0f0f0d;
    --bg-alt: #171714;
    --surface: #151512;
    --surface-soft: #1d1d19;
    --ink: #f4f3ee;
    --ink-soft: #d7d5cc;
    --muted: #a3a096;
    --line: rgba(244, 243, 238, 0.14);
    --line-strong: rgba(244, 243, 238, 0.28);
    --accent: #f4f3ee;
    --nav-bg: rgba(15, 15, 13, 0.86);
    --shadow: none;
    --shadow-soft: none;
  }

  .post-card--featured {
    background: linear-gradient(180deg, #1b1a16 0%, var(--surface) 100%);
  }

  .post__body blockquote {
    background: rgba(244, 243, 238, 0.06);
  }

  .post__body .math,
  .code-caption code {
    background: rgba(244, 243, 238, 0.08);
  }

  .text-button:hover {
    background: rgba(244, 243, 238, 0.12);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Manrope", sans-serif;
  background: var(--bg);
  overflow-x: hidden;
  line-height: 1.55;
}

img {
  display: block;
}

a {
  color: var(--ink);
  text-decoration: none;
}

button {
  font: inherit;
  border: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-family: "Manrope", sans-serif;
  font-weight: 650;
  letter-spacing: -0.024em;
  color: var(--ink);
}

/* ---------- Navigation ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 62px;
  padding: 14px clamp(20px, 4vw, 48px);
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-nav__brand {
  font-family: "Instrument Serif", serif;
  font-size: 1.92rem;
  line-height: 1;
  color: var(--ink);
}

.site-nav__links {
  display: flex;
  gap: clamp(14px, 2.2vw, 26px);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.site-nav__links a {
  color: var(--ink-soft);
  transition: color var(--ease);
}

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

/* ---------- Hero ---------- */

.hero {
  width: min(1180px, calc(100% - clamp(40px, 8vw, 96px)));
  margin: 0 auto;
  text-align: left;
  padding: clamp(76px, 14vh, 136px) 0 clamp(54px, 10vh, 88px);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  border-bottom: 1px solid var(--line);
}

.hero--compact {
  padding: clamp(52px, 9vh, 82px) 0 clamp(30px, 6vh, 52px);
}

.blog-hero {
  gap: 8px;
  width: min(1240px, calc(100% - clamp(40px, 8vw, 96px)));
  padding-bottom: clamp(14px, 2.4vh, 22px);
}

.hero__title {
  max-width: 980px;
  font-size: clamp(4.2rem, 14vw, 9.5rem);
  font-weight: 650;
  line-height: 0.95;
  letter-spacing: -0.06em;
}

.hero__title--sm {
  font-size: clamp(2.8rem, 8vw, 5rem);
}

.hero__subtitle {
  margin: 0;
  max-width: 680px;
  color: var(--ink-soft);
  font-size: clamp(1.02rem, 1.5vw, 1.18rem);
  line-height: 1.65;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-weight: 800;
}

/* ---------- Sections ---------- */

.section {
  padding: clamp(46px, 8vh, 84px) clamp(20px, 4vw, 48px);
}

.blog-index {
  padding-top: clamp(20px, 3vh, 30px);
}

.section--alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section__inner {
  width: min(1280px, 100%);
  margin: 0 auto;
}

.section__eyebrow {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section__title {
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  line-height: 1.08;
  margin-bottom: 24px;
  max-width: 32ch;
}

.section__lead {
  max-width: 80ch;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.25vw, 1.08rem);
  line-height: 1.72;
  margin: 0 0 36px;
}

/* ---------- Prose ---------- */

.prose {
  max-width: 68ch;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.prose p {
  margin: 0 0 20px;
}

.prose a {
  color: #4f9cff;
  border-bottom: 1px solid rgba(79, 156, 255, 0.48);
  text-decoration-color: rgba(79, 156, 255, 0.48);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.14em;
}

.prose a:hover {
  border-bottom-color: #4f9cff;
}

.prose__meta {
  margin-top: 32px;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ---------- Cycle diagram ---------- */

.cycle {
  position: relative;
  width: min(720px, 100%);
  aspect-ratio: 600 / 520;
  margin: 40px auto 0;
}

.cycle__arrows {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.cycle__node {
  position: absolute;
  width: clamp(200px, 32%, 260px);
  padding: 20px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transform: translate(-50%, -50%);
}

.cycle__node--top {
  top: 17%;
  left: 50%;
}

.cycle__node--right {
  top: 83%;
  left: 78%;
}

.cycle__node--left {
  top: 83%;
  left: 22%;
}

.cycle__index {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
  line-height: 1;
}

.cycle__node h3 {
  font-family: "Manrope", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.cycle__node p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.55;
}

@media (max-width: 760px) {
  .cycle {
    aspect-ratio: auto;
    display: grid;
    gap: 16px;
  }

  .cycle__arrows {
    display: none;
  }

  .cycle__node {
    position: static;
    transform: none;
    width: 100%;
  }
}

/* ---------- Code block ---------- */

.code-block {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: #141414;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-top: 18px;
}

.code-block__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: #1e1e1e;
  color: #d5d5d0;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.code-block__head .text-button {
  color: #d5d5d0;
  background: rgba(255, 255, 255, 0.06);
}

.code-block__head .text-button:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
}

.code-block__file {
  font-family: "JetBrains Mono", monospace;
  letter-spacing: 0;
}

.code-block pre {
  margin: 0;
  padding: 22px 24px;
  color: #f3f3ef;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.92rem;
  line-height: 1.6;
  overflow-x: auto;
}

.code-block code {
  font-family: inherit;
}

.tok-k {
  color: #8eb7ff;
}

.tok-c {
  color: #8f8f89;
  font-style: italic;
}

.tok-s {
  color: #9ee6b5;
}

.tok-n {
  color: #f2cf8d;
}

.code-caption {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.code-caption code {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.88em;
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(23, 20, 17, 0.06);
}

/* ---------- CTA ---------- */

.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.cta {
  display: inline-flex;
  align-items: center;
  padding: 14px 22px;
  border-radius: var(--radius-lg);
  background: var(--ink);
  color: var(--bg);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--ease), background var(--ease);
}

.cta:hover {
  transform: translateY(-1px);
  background: #000;
}

.cta--ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line-strong);
}

.cta--ghost:hover {
  background: var(--surface);
}

/* ---------- Blog list ---------- */

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.post-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--ease), background var(--ease);
}

.post-card:hover {
  border-color: var(--line-strong);
  background: var(--surface-soft);
}

.post-card--featured {
  background: var(--surface-soft);
  border-color: var(--line-strong);
}

.post-card--featured .post-card__meta {
  color: var(--accent);
}

.post-card__link {
  display: block;
  padding: 26px 28px;
  color: inherit;
}

.post-card__meta {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.post-card__title {
  font-size: clamp(1.5rem, 2.6vw, 1.95rem);
  margin: 0 0 12px;
  line-height: 1.15;
}

.post-card__excerpt {
  margin: 0 0 16px;
  color: var(--ink-soft);
  font-size: 1.02rem;
  max-width: 62ch;
}

.post-card__cta {
  margin: 0;
  color: var(--accent);
  font-weight: 800;
  font-size: 0.95rem;
}

/* ---------- Post ---------- */

.post {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px clamp(20px, 4vw, 32px) 100px;
}

.post__back {
  display: inline-block;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.post__back:hover {
  color: var(--ink);
}

.post__meta {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.post__title {
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.06;
  margin-bottom: 18px;
}

.post__authors {
  margin: 0 0 40px;
  color: var(--muted);
  font-size: 0.98rem;
  font-style: italic;
}

.post__body {
  font-size: 1.08rem;
}

.post__body h2 {
  font-size: 1.6rem;
  margin: 36px 0 14px;
}

.post__body ul,
.post__body ol {
  padding-left: 22px;
  margin: 0 0 20px;
}

.post__body li {
  margin-bottom: 8px;
}

.post__lede {
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--ink);
  margin-bottom: 32px;
}

.post__body blockquote {
  margin: 28px 0;
  padding: 18px 24px;
  border-left: 3px solid var(--accent);
  background: var(--surface-soft);
  color: var(--ink);
  font-family: "Manrope", sans-serif;
  font-size: 1.12rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.post__body .math {
  font-family: "JetBrains Mono", monospace;
  background: var(--surface-soft);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  text-align: center;
}

.post__figure {
  margin: 36px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.post__figure img {
  width: 100%;
  height: auto;
  display: block;
}

.post__figure figcaption {
  padding: 16px 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.55;
}

.post--showcase {
  max-width: 1180px;
}

.showcase-post {
  max-width: none;
}

.showcase-intro,
.showcase-section__intro {
  max-width: 76ch;
}

.showcase-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.showcase-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 0.86rem;
  font-weight: 700;
  border-bottom: 1px solid var(--line);
}

.showcase-nav a:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

.showcase-nav li {
  margin: 0;
}

.showcase-section {
  margin-top: 58px;
  padding-top: 42px;
  border-top: 1px solid var(--line);
}

.showcase-section h2 {
  font-size: clamp(1.9rem, 3.4vw, 2.7rem);
  line-height: 1.08;
  margin: 0 0 16px;
}

.showcase-grid {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.showcase-example {
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.showcase-example h3 {
  font-family: "Manrope", sans-serif;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  margin: 0 0 14px;
}

.showcase-media {
  margin-top: 12px;
}

.showcase-media img {
  width: 100%;
  max-height: 760px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.showcase-media--single img,
.showcase-media--stack img {
  display: block;
}

.showcase-media--stack {
  display: grid;
  gap: 12px;
}

.showcase-media--row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(180px, 100%), 1fr));
  gap: 12px;
  align-items: start;
}

.showcase-media--row img {
  max-height: 460px;
}

/* ---------- Inference demo ---------- */

.demo {
  display: grid;
  gap: 22px;
  margin-top: 12px;
}

.visualizer {
  min-height: 286px;
  display: grid;
  place-items: center;
  padding: 22px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow-x: auto;
}

.visualizer__empty {
  max-width: 420px;
  margin: 0;
  color: var(--muted);
  text-align: center;
  line-height: 1.7;
}

.visualizer__content {
  width: max-content;
  min-width: 100%;
  display: flex;
  gap: 22px;
  align-items: center;
  justify-content: flex-start;
}

.visualizer__inputs {
  display: flex;
  flex-wrap: nowrap;
  gap: 16px;
  justify-content: flex-start;
  flex: 0 0 auto;
  padding-bottom: 2px;
}

.visualizer__arrow,
.builder__arrow {
  display: grid;
  place-items: center;
  font-family: "Manrope", sans-serif;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.builder {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(220px, 300px);
  gap: 20px;
  align-items: center;
}

.drop-zone {
  min-height: 104px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  flex-wrap: nowrap;
  padding: 16px;
  border-radius: var(--radius-lg);
  border: 1px dashed var(--line-strong);
  background: var(--surface-soft);
  overflow-x: auto;
  transition:
    border-color var(--ease),
    background var(--ease),
    box-shadow var(--ease);
}

.drop-zone--output {
  justify-content: center;
}

.drop-zone.is-hovered {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(21, 115, 255, 0.12);
}

.drop-zone__hint {
  color: var(--muted);
  font-size: 0.96rem;
  white-space: nowrap;
}

.equation-notation {
  margin: 0;
  min-height: 28px;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.01em;
  text-align: center;
}

.token-tray {
  padding: 18px 0 2px;
  border-top: 1px solid var(--line);
}

.token-tray__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.token-tray__actions {
  display: flex;
  gap: 14px;
}

.text-button {
  min-height: 30px;
  padding: 5px 9px;
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  color: var(--ink-soft);
  font-weight: 800;
  font-size: 0.84rem;
  transition:
    color var(--ease),
    background var(--ease),
    border-color var(--ease);
}

.text-button:hover {
  color: var(--ink);
  background: rgba(17, 17, 17, 0.08);
}

.token-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.token-box {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  user-select: none;
  box-shadow: var(--shadow-soft);
  transition:
    transform var(--ease),
    box-shadow var(--ease),
    border-color var(--ease),
    opacity var(--ease);
}

.token-box[draggable="true"] {
  cursor: grab;
}

.token-box.is-drag-source {
  opacity: 0.45;
}

.token-box__stripe {
  width: 7px;
  height: 24px;
  border-radius: 4px;
  background: currentColor;
}

.token-box__label {
  font-weight: 700;
  font-size: 0.95rem;
}

.token-box__remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-sm);
  background: rgba(23, 20, 17, 0.06);
  color: inherit;
  line-height: 1;
}

.token-box--rgb {
  color: #1573ff;
}

.token-box--depth {
  color: #606a76;
}

.token-box--feature {
  color: #8b5cf6;
}

.token-box--control {
  color: #dc4f69;
}

.token-box--custom {
  color: #3f7f58;
}

.image-card,
.image-card--empty {
  width: auto;
  flex: 0 0 auto;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.image-card img {
  width: auto;
  height: auto;
  max-width: 320px;
  max-height: 220px;
  object-fit: contain;
}

.image-card figcaption,
.image-card--empty span {
  display: block;
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
  text-align: center;
}

.image-card--output img {
  max-width: 380px;
  max-height: 260px;
}

.image-card--empty {
  display: grid;
  place-items: center;
  min-height: 240px;
  color: var(--muted);
}

.image-card--empty span {
  border-top: 0;
}

.token-bank__status {
  color: var(--muted);
  line-height: 1.7;
}

.is-dragging .drop-zone {
  border-style: solid;
}

/* ---------- Footer ---------- */

.site-footer {
  padding: 24px clamp(20px, 4vw, 48px);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
  flex-wrap: wrap;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .builder {
    grid-template-columns: 1fr;
  }

  .visualizer__arrow,
  .builder__arrow {
    min-height: 48px;
  }

  .drop-zone,
  .drop-zone--output {
    justify-content: center;
  }

  .token-bank {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .site-nav {
    padding: 14px 18px;
  }

  .site-nav__links {
    gap: 16px;
    font-size: 0.88rem;
  }

  .visualizer {
    min-height: 220px;
    padding: 18px;
  }

  .token-tray__head {
    align-items: flex-start;
    flex-direction: column;
  }

  .token-tray__actions {
    gap: 18px;
  }

  .post-card__link {
    padding: 24px 22px;
  }
}