/*
  Kevin Lan — personal site
  Minimal / brutalist design system. No framework, no build step.
*/

:root {
  --ink: #111111;
  --paper: #f4f2ec;
  --paper-alt: #ffffff;
  --line: #111111;
  --accent: #ff3d1a;
  --muted: #5c5c5c;

  --font-display: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", ui-monospace, Menlo, Consolas, "Liberation Mono", monospace;

  --border: 2px solid var(--ink);
  --border-thick: 4px solid var(--ink);
  --gap: 1.5rem;
  --max: 1120px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a {
  color: var(--ink);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
a:hover { color: var(--accent); }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.mono {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.05;
  margin: 0 0 0.6em;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.4rem, 6vw, 4.6rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1em; }
p.lead { font-size: 1.2rem; }

.muted { color: var(--muted); }

hr {
  border: none;
  border-top: var(--border);
  margin: 2.5rem 0;
}

/* ---------- Nav ---------- */

.site-nav {
  border-bottom: var(--border-thick);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.brand:hover { color: var(--ink); }
.brand .dot { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  border-bottom-color: var(--accent);
  color: var(--ink);
}

.nav-toggle {
  display: none;
  background: none;
  border: var(--border);
  font-family: var(--font-mono);
  padding: 0.4rem 0.7rem;
  cursor: pointer;
}

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: var(--border-thick);
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.5rem 1.25rem;
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: 0.6rem 0; border-bottom: 1px solid #ddd; }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.85rem;
  text-decoration: none;
  padding: 0.85rem 1.4rem;
  border: var(--border);
  background: var(--ink);
  color: var(--paper);
  transition: transform 0.12s ease;
}

.btn:hover {
  color: var(--paper);
  background: var(--accent);
  border-color: var(--accent);
  transform: translate(-2px, -2px);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
}
.btn-outline:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.btn-row { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* ---------- Layout helpers ---------- */

.section { padding: 4.5rem 0; }
.section-tight { padding: 2.5rem 0; }
.section-border-top { border-top: var(--border); }

.grid {
  display: grid;
  gap: var(--gap);
}
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 800px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border: 1px solid var(--ink);
  padding: 0.2rem 0.55rem;
  margin: 0 0.4rem 0.4rem 0;
}

/* ---------- Cards ---------- */

.card {
  border: var(--border);
  background: var(--paper-alt);
  padding: 1.6rem;
}

a.card {
  transition: transform 0.12s ease, border-color 0.12s ease;
}
a.card:hover {
  border-color: var(--accent);
  transform: translate(-2px, -2px);
}
a.card:hover h3 {
  color: var(--accent);
}

.card-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 1rem;
}

.card-flag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--accent);
  color: var(--paper);
  padding: 0.15rem 0.5rem;
  margin-bottom: 0.8rem;
}

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

.hero {
  padding: 4.5rem 0 3.5rem;
  border-bottom: var(--border-thick);
}

.hero-name {
  font-size: clamp(3rem, 9vw, 6.2rem);
  margin-bottom: 0.15em;
}

.hero-role {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--accent);
  margin-bottom: 1.2rem;
}

/* ---------- Timeline ---------- */

.timeline-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: var(--gap);
  padding: 1.6rem 0;
  border-top: var(--border);
}
.timeline-item:last-child { border-bottom: var(--border); }

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

@media (max-width: 640px) {
  .timeline-item { grid-template-columns: 1fr; gap: 0.4rem; }
}

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

.site-footer {
  border-top: var(--border-thick);
  padding: 2.5rem 0;
}

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

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.footer-links a { text-decoration: none; }

/* ---------- Utility ---------- */

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

.photo-frame {
  border: var(--border-thick);
}

.skill-block {
  border-top: var(--border);
  padding: 1.4rem 0;
}
.skill-block:last-child { border-bottom: var(--border); }
.skill-block h4 { margin-bottom: 0.4em; }

@media print {
  .site-nav, .site-footer, .no-print { display: none !important; }
}