/* ============================================================
   Tim's personal site — design system
   ============================================================ */

:root {
  --bg: #FFF8F0;
  --bg-2: #FDEFE0;
  --surface: #FFFFFF;
  --ink: #1A1410;
  --ink-2: #4A4038;
  --ink-3: #8A7D70;
  --line: rgba(26, 20, 16, 0.10);
  --accent: #FF5A1F;
  --accent-2: #FFB627;
  --accent-soft: rgba(255, 90, 31, 0.10);
  --shadow-sm: 0 1px 2px rgba(26, 20, 16, 0.04), 0 0 0 1px rgba(26, 20, 16, 0.04);
  --shadow-md: 0 12px 32px -12px rgba(26, 20, 16, 0.18);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="dark"] {
  --bg: #14110E;
  --bg-2: #1C1814;
  --surface: #1F1A15;
  --ink: #FBF6EF;
  --ink-2: #C9BEB1;
  --ink-3: #8A7D70;
  --line: rgba(251, 246, 239, 0.10);
  --accent: #FF7A45;
  --accent-2: #FFB627;
  --accent-soft: rgba(255, 122, 69, 0.14);
  --shadow-md: 0 12px 32px -12px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
  overflow-x: hidden;
}

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

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

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 0.5em;
}
h1 { font-size: clamp(2.4rem, 6vw, 4.5rem); letter-spacing: -0.035em; }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); }
h3 { font-size: 1.35rem; }
p { margin: 0 0 1em; color: var(--ink-2); }
.lead { font-size: 1.2rem; color: var(--ink-2); max-width: 60ch; }
code { font-family: var(--font-mono); font-size: 0.92em; background: var(--bg-2); padding: 2px 6px; border-radius: 6px; }

/* ---------- Layout ---------- */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}
.section { padding: 80px 0; }
.section--tight { padding: 48px 0; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  max-width: 1080px;
  margin: 0 auto;
}
.nav__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.nav__brand span { color: var(--accent); }
.nav__links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav__links a {
  font-size: 0.95rem;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--ink-2);
  transition: all 0.2s var(--ease);
}
.nav__links a:hover { background: var(--accent-soft); color: var(--accent); }
.nav__links a.active { color: var(--accent); }
.theme-toggle {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  width: 36px; height: 36px;
  border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  margin-left: 8px;
  transition: all 0.2s var(--ease);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { width: 16px; height: 16px; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 100px 0 80px; overflow: hidden; }
.hero__blob {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 65%);
  opacity: 0.25;
  border-radius: 50%;
  filter: blur(40px);
  z-index: 0;
  animation: blob-drift 22s ease-in-out infinite;
}
.hero__blob--2 {
  top: 40%; left: -15%;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 65%);
  opacity: 0.18;
  animation-delay: -8s;
  animation-duration: 28s;
}
@keyframes blob-drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(80px, -40px) scale(1.1); }
  66% { transform: translate(-40px, 60px) scale(0.95); }
}
.hero__inner { position: relative; z-index: 1; }
.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 6px 14px;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  margin-bottom: 28px;
}
.hero__tag::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px var(--accent-soft); }
  50% { box-shadow: 0 0 0 8px transparent; }
}
.hero h1 { max-width: 14ch; margin-bottom: 24px; }
.hero h1 em { font-style: normal; color: var(--accent); position: relative; }
.hero h1 em::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0.08em;
  height: 0.18em;
  background: var(--accent-2);
  opacity: 0.35;
  z-index: -1;
}
.hero__sub { font-size: 1.25rem; color: var(--ink-2); max-width: 58ch; margin-bottom: 36px; }
.hero__cta { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 0.98rem;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  font-family: var(--font-body);
}
.btn--primary { background: var(--accent); color: white; }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px -10px var(--accent); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn svg { width: 16px; height: 16px; transition: transform 0.25s var(--ease); }
.btn:hover svg { transform: translateX(3px); }

/* ---------- Section header ---------- */
.section__header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 40px; gap: 24px; flex-wrap: wrap; }
.section__header h2 { margin: 0; }
.section__link { display: inline-flex; align-items: center; gap: 6px; color: var(--accent); font-weight: 500; }
.section__link:hover { gap: 10px; }

/* ---------- Cards / Projects ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all 0.35s var(--ease);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 240px;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 0%), var(--accent-soft), transparent 60%);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--shadow-md); }
.card:hover::before { opacity: 1; }
.card__tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--ink-2); margin-bottom: 20px; }
.card__footer { margin-top: auto; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.chip {
  font-size: 0.78rem;
  padding: 4px 10px;
  background: var(--bg-2);
  border-radius: 999px;
  color: var(--ink-2);
}
.card__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--accent);
  font-weight: 500;
  font-size: 0.95rem;
  margin-left: auto;
}
.card__link:hover { gap: 8px; }

/* ---------- Post list ---------- */
.posts { display: flex; flex-direction: column; }
.post-row {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  transition: all 0.25s var(--ease);
}
.post-row:hover { padding-left: 12px; }
.post-row:hover .post-row__title { color: var(--accent); }
.post-row__date { font-family: var(--font-mono); font-size: 0.85rem; color: var(--ink-3); }
.post-row__title { font-family: var(--font-display); font-size: 1.2rem; font-weight: 600; color: var(--ink); transition: color 0.25s var(--ease); margin: 0 0 4px; }
.post-row__excerpt { color: var(--ink-2); font-size: 0.95rem; margin: 0; }
.post-row__tags { display: flex; gap: 6px; flex-wrap: wrap; }

/* ---------- Filter bar ---------- */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.filter-bar button {
  font-family: var(--font-body);
  font-size: 0.92rem;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-2);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s var(--ease);
}
.filter-bar button:hover { border-color: var(--accent); color: var(--accent); }
.filter-bar button.active { background: var(--accent); color: white; border-color: var(--accent); }

/* ---------- About page ---------- */
.about-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 720px) {
  .about-layout { grid-template-columns: 1fr; gap: 32px; }
}
.about-photo {
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 700;
  position: sticky;
  top: 100px;
}
.about-prose p { font-size: 1.1rem; line-height: 1.75; }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 32px; margin: 40px 0; }
.timeline::before {
  content: "";
  position: absolute;
  left: 6px; top: 8px; bottom: 8px;
  width: 2px;
  background: var(--line);
}
.timeline__item { position: relative; padding-bottom: 32px; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -32px; top: 6px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.timeline__date { font-family: var(--font-mono); font-size: 0.82rem; color: var(--ink-3); margin-bottom: 4px; }
.timeline__title { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; margin-bottom: 4px; }
.timeline__desc { color: var(--ink-2); font-size: 0.98rem; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 40px 0;
  margin-top: 80px;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer__meta { color: var(--ink-3); font-size: 0.92rem; }
.footer__socials { display: flex; gap: 8px; }
.footer__socials a {
  width: 36px; height: 36px;
  border-radius: 999px;
  border: 1px solid var(--line);
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--ink-2);
  transition: all 0.2s var(--ease);
}
.footer__socials a:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.footer__socials svg { width: 16px; height: 16px; }

/* ---------- Blog post (rendered Markdown) ---------- */
.prose {
  max-width: 68ch;
  margin: 0 auto;
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--ink-2);
}
.prose h1, .prose h2, .prose h3 { color: var(--ink); margin-top: 1.8em; }
.prose h1 { font-size: 2.4rem; margin-top: 0; }
.prose a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 20px;
  margin: 1.5em 0;
  color: var(--ink);
  font-style: italic;
}
.prose pre {
  background: var(--bg-2);
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 0.92rem;
  line-height: 1.55;
  border: 1px solid var(--line);
}
.prose pre code { background: transparent; padding: 0; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose img { border-radius: var(--radius-sm); margin: 1.5em 0; }
.post-meta {
  text-align: center;
  margin-bottom: 48px;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 0.88rem;
}
.post-meta .post-meta__tags { display: inline-flex; gap: 6px; margin-left: 12px; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ---------- Utilities ---------- */
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

@media (max-width: 720px) {
  .nav__links a { display: none; }
  .nav__links a.active { display: inline-flex; }
  .section { padding: 60px 0; }
  .post-row { grid-template-columns: 1fr; gap: 8px; padding: 18px 0; }
  .post-row__date { order: -1; }
  .post-row__tags { order: 1; }
  .hero { padding: 60px 0; }
}