:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-2: #eef3f8;
  --ink: #15202b;
  --muted: #52616f;
  --line: #d9e1e8;
  --accent: #126a6f;
  --accent-2: #b84a62;
  --shadow: 0 18px 45px rgba(21, 32, 43, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
}

a { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 5vw, 64px);
  background: rgba(247, 248, 251, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  font-weight: 800;
  font-size: 1.05rem;
  text-decoration: none;
  white-space: nowrap;
}

nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

nav a {
  padding: 7px 10px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--surface-2);
}

main {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}

.home-hero {
  padding: clamp(56px, 9vw, 112px) 0 36px;
  max-width: 900px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 980px;
  font-size: clamp(2.25rem, 5vw, 5rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.lede {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.tag-row span {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 700;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 28px 0 72px;
}

.project-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.project-card img,
.project-card video {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: var(--surface-2);
}

.project-card span,
.project-card h2,
.project-card p {
  margin-left: 18px;
  margin-right: 18px;
}

.project-card span {
  margin-top: 18px;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.project-card h2 {
  margin-top: 7px;
  margin-bottom: 8px;
  font-size: 1.1rem;
  line-height: 1.25;
}

.project-card p {
  margin-top: 0;
  margin-bottom: 20px;
  color: var(--muted);
  font-size: 0.95rem;
}

.project-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: clamp(24px, 5vw, 56px);
  align-items: center;
  padding: clamp(44px, 7vw, 82px) 0;
}

.project-hero img,
.project-hero video {
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.writeup-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  padding-bottom: 72px;
}

.toc {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.toc a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

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

article {
  display: grid;
  gap: 18px;
}

.writeup-section {
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.writeup-section h2 {
  margin: 0 0 14px;
  font-size: clamp(1.3rem, 2vw, 1.75rem);
  line-height: 1.2;
}

.writeup-section p {
  margin: 0 0 14px;
  color: var(--muted);
}

.writeup-section p:last-child { margin-bottom: 0; }

.media-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.media-card {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}

.media-card img,
.media-card video {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: contain;
  background: #fdfefe;
}

.project-media {
  display: block;
}

.media-card figcaption {
  padding: 10px 12px;
  color: var(--muted);
  font-size: 0.86rem;
}

.link-list {
  display: grid;
  gap: 10px;
  padding-left: 20px;
  color: var(--muted);
}

.link-list a {
  color: var(--accent);
  font-weight: 700;
}

footer {
  padding: 28px clamp(18px, 5vw, 64px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}

.redirect-page {
  display: grid;
  min-height: 70vh;
  place-items: center;
}

@media (max-width: 900px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  nav { justify-content: flex-start; }

  .project-grid,
  .project-hero,
  .writeup-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .media-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  main { width: min(100% - 28px, 1180px); }

  h1 { font-size: 2.25rem; }

  .project-grid,
  .media-grid,
  .toc {
    grid-template-columns: 1fr;
  }

  .media-card img { height: auto; }
}


.writeup-section h3 {
  margin: 26px 0 10px;
  color: var(--ink);
  font-size: 1.08rem;
  line-height: 1.3;
}

.writeup-section ul {
  color: var(--muted);
}

.math-block {
  overflow-x: auto;
  margin: 18px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.02rem, 2vw, 1.25rem);
  line-height: 1.55;
  white-space: nowrap;
}

.inline-math {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
}

.sqrt {
  display: inline-flex;
  align-items: flex-start;
  gap: 2px;
}

.sqrt > span {
  border-top: 1px solid currentColor;
  padding: 0 3px;
}

.math-gap {
  display: inline-block;
  width: 1.2em;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.video-card {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.video-card video {
  display: block;
  width: 100%;
  background: #101820;
}

.video-card figcaption {
  padding: 10px 12px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 700px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
}


.writeup-section h3 {
  margin: 26px 0 10px;
  color: var(--ink);
  font-size: 1.08rem;
  line-height: 1.3;
}

.writeup-section ul {
  color: var(--muted);
}

.math-block {
  overflow-x: auto;
  margin: 18px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}

.equation-display {
  display: flex;
  align-items: center;
  gap: 14px;
  overflow-x: auto;
  margin: 18px 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
}

.equation-pair {
  gap: 28px;
  flex-wrap: wrap;
}

.eq-symbol {
  white-space: nowrap;
}

.matrix {
  display: inline-grid;
  gap: 2px;
  padding: 4px 10px;
  border-left: 2px solid currentColor;
  border-right: 2px solid currentColor;
  line-height: 1.15;
  text-align: center;
}

.fraction {
  display: inline-grid;
  vertical-align: middle;
  text-align: center;
  line-height: 1.1;
}

.fraction span:first-child {
  padding: 0 6px 3px;
  border-bottom: 1px solid currentColor;
}

.fraction span:last-child {
  padding: 3px 6px 0;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.video-card {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.video-card video {
  display: block;
  width: 100%;
  background: #101820;
}

.video-card figcaption {
  padding: 10px 12px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 700px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
}