/* ── Tokens ─────────────────────────────────────────────────────────── */
:root {
  --bg: #fafaf8;
  --fg: #111110;
  --fg-muted: #6b6a67;
  --fg-faint: #a8a7a4;
  --border: #e4e3e0;
  --tag-bg: #f0efec;
  --tag-fg: #6b6a67;
  --btn-primary-bg: #111110;
  --btn-primary-fg: #fafaf8;
  --btn-ghost-border: #d4d3d0;
  --btn-ghost-fg: #111110;
  --card-bg: #fafaf8;
  --card-border: #e4e3e0;

  --font-serif: "Noto Serif", Georgia, serif;
  --font-sans: "DM Sans", system-ui, sans-serif;

  --max-w: 960px;
  --gutter: clamp(1.25rem, 5vw, 2.5rem);
  --section-gap: clamp(4rem, 8vw, 6rem);
  --anim-duration: 0.5s;
}

[data-theme="dark"] {
  --bg: #111110;
  --fg: #f0efec;
  --fg-muted: #a8a7a4;
  --fg-faint: #6b6a67;
  --border: #2a2a28;
  --tag-bg: #1e1e1c;
  --tag-fg: #a8a7a4;
  --btn-primary-bg: #f0efec;
  --btn-primary-fg: #111110;
  --btn-ghost-border: #3a3a38;
  --btn-ghost-fg: #f0efec;
  --card-bg: #111110;
  --card-border: #2a2a28;
}

/* ── Reset ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ── Layout helpers ─────────────────────────────────────────────────── */
.container {
  width: min(var(--max-w), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.divider {
  border: none;
  border-top: 0.5px solid var(--border);
  margin: 0;
}

/* ── Nav ────────────────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 0.5px solid var(--border);
  transition: background-color 0.3s ease;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--fg-muted);
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 0.5px;
  background: var(--fg);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.nav-links a:hover { color: var(--fg); }
.nav-links a:hover::after { transform: scaleX(1); }

.nav-right {
  display: flex;
  align-items: center;
  gap: 2rem;
}

#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--fg-muted);
  font-size: 1rem;
  padding: 0.25rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease;
}

#theme-toggle:hover { color: var(--fg); }

#theme-toggle .icon {
  display: inline-block;
  transition: transform 0.3s ease;
}

#theme-toggle.switching .icon { transform: rotate(20deg); }

/* ── Hero ───────────────────────────────────────────────────────────── */
.hero {
  padding-block: clamp(4rem, 10vw, 7rem) clamp(3rem, 6vw, 5rem);
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 1.5rem;
}

.headline {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 600;
  margin-bottom: 1.75rem;
}

.headline em {
  font-style: italic;
  font-weight: 400;
}

.hero-bio {
  font-size: 1.0625rem;
  color: var(--fg-muted);
  max-width: 42ch;
  margin-bottom: 2.25rem;
  line-height: 1.65;
}

.cta-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.625rem 1.25rem;
  border-radius: 6px;
  cursor: pointer;
  border: 0.5px solid transparent;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-fg);
  border-color: var(--btn-primary-bg);
}

.btn-ghost {
  background: transparent;
  color: var(--btn-ghost-fg);
  border-color: var(--btn-ghost-border);
}

.btn-ghost:hover { border-color: var(--fg-muted); }

/* ── Section labels ─────────────────────────────────────────────────── */
.section-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 2rem;
}

/* ── Work section ───────────────────────────────────────────────────── */
.work-section {
  padding-block: var(--section-gap);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  border: 0.5px solid var(--card-border);
  border-radius: 8px;
  overflow: hidden;
}

.project-card {
  background: var(--card-bg);
  padding: 2rem;
  border-right: 0.5px solid var(--card-border);
  border-bottom: 0.5px solid var(--card-border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 0.2s ease;
  position: relative;
}

.project-card:nth-child(2n) { border-right: none; }
.project-card:nth-last-child(-n+2) { border-bottom: none; }

.project-card:hover { transform: translateY(-3px); }

.card-tag {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--tag-fg);
  background: var(--tag-bg);
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  width: fit-content;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.6;
  flex: 1;
}

.card-link {
  font-size: 0.8125rem;
  color: var(--fg-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: auto;
  transition: color 0.15s ease, gap 0.15s ease;
}

.card-link:hover { color: var(--fg); gap: 0.4rem; }

/* ── About section ──────────────────────────────────────────────────── */
.about-section {
  padding-block: var(--section-gap);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.about-bio {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

.interests-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 0.875rem;
}

.tag-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--tag-fg);
  background: var(--tag-bg);
  border: 0.5px solid var(--border);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
}

/* ── Custom text blocks ─────────────────────────────────────────────── */
.custom-block {
  padding-block: var(--section-gap);
}

.block-heading {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.block-body {
  color: var(--fg-muted);
  line-height: 1.75;
  max-width: 68ch;
}

/* ── Writing section ────────────────────────────────────────────────── */
.writing-section {
  padding-block: var(--section-gap);
}

.post-list {
  display: flex;
  flex-direction: column;
}

.post-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-block: 1.125rem;
  border-top: 0.5px solid var(--border);
}

.post-row:last-child { border-bottom: 0.5px solid var(--border); }

.post-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 400;
  transition: transform 0.15s ease, color 0.15s ease;
}

.post-row:hover .post-title {
  transform: translateX(4px);
  color: var(--fg);
}

.post-title { color: var(--fg-muted); }

.post-row a { display: contents; }
.post-row a:hover .post-title { color: var(--fg); }

.post-date {
  font-size: 0.8125rem;
  color: var(--fg-faint);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Footer ─────────────────────────────────────────────────────────── */
footer {
  border-top: 0.5px solid var(--border);
  padding-block: 2rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.footer-label {
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  color: var(--fg-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.8125rem;
  color: var(--fg-faint);
  transition: color 0.15s ease;
}

.footer-links a:hover { color: var(--fg); }

/* ── Animations ─────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: no-preference) {
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: none; }
  }

  .anim {
    opacity: 0;
    animation: fadeUp var(--anim-duration, 0.5s) cubic-bezier(0.22, 1, 0.36, 1) forwards;
  }
}

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .project-grid { grid-template-columns: 1fr; }
  .project-card { border-right: none; }
  .project-card:nth-last-child(-n+2) { border-bottom: 0.5px solid var(--card-border); }
  .project-card:last-child { border-bottom: none; }

  .about-grid { grid-template-columns: 1fr; }

  .nav-links { display: none; }

  .footer-inner { flex-direction: column; align-items: flex-start; gap: 1rem; }
}