/* Bobo Labs — Swiss / International typographic single page
   Design tokens first, then layout. Edit tokens to re-skin the whole site. */

:root {
  /* Color — disciplined: near-white, near-black ink, one accent */
  --color-bg: oklch(98.5% 0 0);
  --color-ink: oklch(17% 0 0);
  --color-muted: oklch(46% 0 0);
  --color-line: oklch(87% 0 0);
  --color-accent: oklch(57% 0.21 27);
  --color-accent-ink: oklch(98% 0 0);

  /* Type — system stack, zero dependency; mono for technical labels */
  --font-sans: "Helvetica Neue", "Inter", system-ui, -apple-system, "PingFang TC", "Noto Sans TC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", monospace;

  --text-eyebrow: 0.8125rem;
  --text-body: clamp(1rem, 0.95rem + 0.3vw, 1.1875rem);
  --text-h2: clamp(1.75rem, 1.2rem + 2.4vw, 3rem);
  --text-hero: clamp(2.75rem, 1rem + 8vw, 7rem);

  /* Space — modular rhythm, not uniform padding everywhere */
  --space-section: clamp(4.5rem, 3rem + 7vw, 9rem);
  --wrap-max: 76rem;
  --wrap-pad: clamp(1.25rem, 0.5rem + 3vw, 3.5rem);

  --duration: 320ms;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.wrap {
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding-inline: var(--wrap-pad);
}

/* Accessibility ---------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-ink);
  color: var(--color-bg);
  padding: 0.75rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Header ----------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.0625rem;
}
.brand-mark {
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: 1.25rem;
}

.nav-list {
  display: flex;
  gap: clamp(1rem, 0.5rem + 2vw, 2.5rem);
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}
.nav-list a {
  text-decoration: none;
  color: var(--color-muted);
  padding-block: 0.25rem;
  border-bottom: 1px solid transparent;
  transition: color var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}
.nav-list a:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

/* Hero ------------------------------------------------------------------- */
.hero {
  padding-block: clamp(4rem, 2rem + 9vw, 9rem) var(--space-section);
  border-bottom: 1px solid var(--color-line);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-eyebrow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 1.75rem;
}

.hero-title {
  font-size: var(--text-hero);
  line-height: 0.98;
  letter-spacing: -0.035em;
  font-weight: 800;
  max-width: 16ch;
}
.hero-title .accent { color: var(--color-accent); }

.hero-lede {
  margin-top: 2rem;
  max-width: 52ch;
  color: var(--color-muted);
  font-size: clamp(1.0625rem, 1rem + 0.4vw, 1.3125rem);
}

.hero-actions {
  margin-top: 2.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  padding: 0.85rem 1.5rem;
  text-decoration: none;
  border: 1px solid var(--color-ink);
  transition: transform var(--duration) var(--ease),
              background-color var(--duration) var(--ease),
              color var(--duration) var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--color-ink);
  color: var(--color-bg);
}
.btn-primary:hover { background: var(--color-accent); border-color: var(--color-accent); }
.btn-ghost { background: transparent; }
.btn-ghost:hover { background: var(--color-ink); color: var(--color-bg); }

/* Section heads ---------------------------------------------------------- */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding-block: 0 clamp(2rem, 1rem + 3vw, 3.5rem);
  border-bottom: 2px solid var(--color-ink);
  margin-bottom: clamp(2.5rem, 1.5rem + 4vw, 4.5rem);
}
.section-index {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent);
  font-weight: 600;
}
.section-head h2 {
  font-size: var(--text-h2);
  letter-spacing: -0.03em;
  font-weight: 800;
}

.work, .writing, .contact { padding-block: var(--space-section); }
.work, .writing { border-bottom: 1px solid var(--color-line); }

/* Project grid — editorial, lead card breaks the grid ------------------- */
.project-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}

.project-card {
  background: var(--color-bg);
  padding: clamp(1.75rem, 1rem + 2.5vw, 2.75rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 16rem;
  transition: background-color var(--duration) var(--ease);
}
.project-card:hover { background: oklch(96% 0 0); }
.project-card--lead { grid-column: 1 / -1; }

.project-meta { display: flex; gap: 0.5rem; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
  border: 1px solid var(--color-line);
  padding: 0.2rem 0.6rem;
}

.project-title {
  font-size: clamp(1.375rem, 1rem + 1.5vw, 2rem);
  letter-spacing: -0.025em;
  font-weight: 700;
}
.project-card--lead .project-title { font-size: clamp(1.75rem, 1rem + 2.5vw, 2.75rem); }

.project-desc { color: var(--color-muted); max-width: 54ch; }

.project-foot {
  margin-top: auto;
  padding-top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}
.project-stack { color: var(--color-muted); }
.project-link {
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: color var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}
.project-link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Link list (writing) ---------------------------------------------------- */
.link-list { list-style: none; }
.link-list li { border-top: 1px solid var(--color-line); }
.link-list li:last-child { border-bottom: 1px solid var(--color-line); }
.link-list a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.5rem;
  padding: 1.5rem 0;
  text-decoration: none;
  transition: padding-inline var(--duration) var(--ease);
}
.link-list a:hover { padding-inline-start: 0.75rem; }
.link-title { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.02em; }
.link-note { color: var(--color-muted); font-size: 0.9375rem; }

.tag--live { color: var(--color-accent); border-color: var(--color-accent); }
.tag--private { color: var(--color-muted); border-style: dashed; }
.project-note { color: var(--color-muted); }
.link-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.5rem;
  padding: 1.5rem 0;
}

/* Contact ---------------------------------------------------------------- */
.contact-lede { font-size: clamp(1.25rem, 1rem + 1vw, 1.75rem); max-width: 30ch; }
.contact-list {
  list-style: none;
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2.5rem;
  font-family: var(--font-mono);
}
.contact-list a {
  text-decoration: none;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 0.15rem;
  transition: border-color var(--duration) var(--ease);
}
.contact-list a:hover { border-bottom-color: var(--color-accent); }

/* Footer ----------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding-block: 2.5rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-muted);
}

/* Responsive ------------------------------------------------------------- */
@media (max-width: 40rem) {
  .project-grid { grid-template-columns: 1fr; }
  .nav-list { gap: 1.1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}