/* Sara Yong – portfolio styles
   One stylesheet shared by every page. Colors and sizes live in the
   variables just below, so changing the look starts there. */

:root {
  --ink: #111;          /* main text */
  --muted: #6b6b6b;     /* secondary text: categories, dates */
  --line: #e6e6e6;      /* thin dividers */
  --paper: #fff;        /* page background */
  --tile: #f4f4f4;      /* background behind images while they load */

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --gutter: clamp(16px, 4vw, 48px);  /* space at the page edges */
  --wide: 1200px;                     /* widest the page content gets */
  --text: 40rem;                      /* comfortable reading width */
}

/* ---------- Basics ---------- */

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { color: var(--muted); }
a:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

h1, h2, h3 { line-height: 1.15; margin: 0; font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }

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

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--paper); padding: 8px 12px;
}
.skip:focus { left: 8px; top: 8px; }

/* ---------- Header ---------- */

.site-header .wrap {
  display: flex; justify-content: space-between; align-items: baseline;
  padding-top: 28px; padding-bottom: 28px;
}
.site-name { font-weight: 600; text-decoration: none; }
.site-nav a { text-decoration: none; margin-left: 24px; }
.site-nav a:first-child { margin-left: 0; }

/* ---------- Home: two columns ---------- */

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

.home { padding-top: 32px; }

.home-intro { margin-bottom: 48px; max-width: 26rem; }
.home-intro p { font-size: 1.125rem; }
.home-name { font-size: 2rem; margin-bottom: 24px; }
.home-name a { text-decoration: none; }

/* Wide screens: narrow intro on the left that stays put, work on the right */
@media (min-width: 900px) {
  .home {
    display: grid;
    grid-template-columns: minmax(240px, 300px) 1fr;
    gap: 64px;
    align-items: start;
  }
  .home-intro { position: sticky; top: 32px; margin-bottom: 0; }
}

.work-list { display: grid; gap: clamp(56px, 8vw, 96px); }

.work-image {
  display: block;
  aspect-ratio: 2 / 1;
  background: #333;     /* matches the grey frame in the placeholder thumbnails */
  overflow: hidden;
}
.work-image img {
  width: 100%; height: 100%;
  object-fit: contain;
  transition: opacity 0.2s ease;
}
.work-image:hover img { opacity: 0.85; }

.work-caption {
  display: grid;
  gap: 16px var(--gutter);
  margin-top: 20px;
}
@media (min-width: 640px) {
  .work-caption { grid-template-columns: 1fr 2fr; }
}
.work-who h2 { font-size: 1.125rem; }
.work-who p { color: var(--muted); margin: 2px 0 0; }
.work-what h3 { font-size: 1.0625rem; font-weight: 500; margin-bottom: 8px; }
.work-what p { color: var(--muted); font-size: 0.9375rem; }


.button {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid var(--ink); border-radius: 4px;
  font-size: 0.875rem; text-decoration: none;
}
.button:hover { background: var(--ink); color: var(--paper); }

/* ---------- Project grid (home + "More projects") ---------- */

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px var(--gutter);
  list-style: none; margin: 0; padding: 0;
}
@media (min-width: 640px) {
  .grid { grid-template-columns: 1fr 1fr; }
}

.card a { display: block; text-decoration: none; }
.card img {
  width: 100%; aspect-ratio: 1 / 1; object-fit: cover;
  background: var(--tile);
  transition: opacity 0.2s ease;
}
.card a:hover img { opacity: 0.85; }
.card a:hover { color: inherit; }
.card h2, .card h3 { font-size: 1.125rem; margin-top: 16px; }
.card .category { color: var(--muted); font-size: 0.9375rem; margin: 2px 0 0; }

/* ---------- Project page ---------- */

.project-head { padding: clamp(32px, 7vw, 80px) 0 clamp(32px, 5vw, 56px); }
.eyebrow {
  color: var(--muted); font-size: 0.8125rem;
  text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 12px;
}
.project-head h1 { font-size: clamp(2rem, 6vw, 4rem); }
.summary { font-size: 1.25rem; max-width: var(--text); margin: 20px 0 0; }

.details {
  display: flex; flex-wrap: wrap; gap: 12px 48px;
  margin: 32px 0 0; padding: 20px 0 0;
  border-top: 1px solid var(--line);
}
.details dt { color: var(--muted); font-size: 0.8125rem; }
.details dd { margin: 0; }

.figure { margin: 0 0 clamp(48px, 8vw, 96px); }
.figure img { width: 100%; background: var(--tile); }
.figure.narrow img { max-width: 420px; margin: 0 auto; }
.figure figcaption {
  max-width: var(--text); margin: 12px auto 0;
  color: var(--muted); font-size: 0.875rem;
}

.section ul { padding-left: 1.25em; margin: 0 0 1em; }
.section li { margin-bottom: 0.5em; }
.credits { color: var(--muted); font-size: 0.9375rem; }

/* Two images side by side; stacks on phones */
.figure.pair { display: grid; gap: var(--gutter); }
@media (min-width: 640px) {
  .figure.pair { grid-template-columns: 1fr 1fr; }
}
.figure + .figure { margin-top: calc(-1 * clamp(48px, 8vw, 96px) + var(--gutter)); }

.section { max-width: var(--text); margin: 0 auto clamp(48px, 8vw, 96px); }
.section h2 { font-size: 1.5rem; margin-bottom: 16px; }

.more { border-top: 1px solid var(--line); padding-top: 40px; margin-top: 32px; }
.more > h2 { font-size: 1rem; color: var(--muted); font-weight: 500; margin-bottom: 24px; }
.more .grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.more .card { max-width: 360px; }

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

.site-footer { margin-top: clamp(64px, 10vw, 128px); padding: 48px 0 40px; border-top: 1px solid var(--line); }
.site-footer h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); font-weight: 500; margin-bottom: 16px; }
.contact { list-style: none; margin: 0 0 48px; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 32px; font-size: 1.125rem; }
.legal { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 32px; color: var(--muted); font-size: 0.875rem; }
.legal p { margin: 0; }

/* ---------- Case study extras (Mercator.ai) ---------- */

/* Brand accents used only on the Mercator.ai visuals */
.theme-mercator, .stat-cover {
  --brand-dark: #1f2b22;
  --brand: #027a3b;
  --brand-soft: #b3d7c4;
  --brand-tint: #eef5f0;
}

/* Signal timeline diagram */
.timeline-figure { background: var(--brand-tint); padding: clamp(20px, 4vw, 40px); }
.timeline {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 12px;
}
.timeline li {
  display: flex; flex-direction: column; gap: 2px;
  padding: 12px 14px; background: var(--paper);
  border-left: 4px solid var(--line);
}
.timeline li.early { border-left-color: var(--brand); }
.tl-name { font-weight: 600; }
.tl-when { color: var(--muted); font-size: 0.875rem; }
.tl-bands { display: none; }
@media (min-width: 760px) {
  .timeline { grid-template-columns: repeat(5, 1fr); }
  .timeline li { border-left: 0; border-top: 4px solid var(--line); }
  .timeline li.early { border-top-color: var(--brand); }
  .tl-bands {
    display: grid; grid-template-columns: 3fr 2fr; gap: 12px;
    margin-top: 12px; font-size: 0.8125rem; font-weight: 500;
  }
  .tl-bands span { padding: 6px 10px; }
  .tl-band-early { background: var(--brand); color: #fff; }
  .tl-band-late { background: var(--line); color: var(--muted); }
}
.timeline-figure figcaption { max-width: none; margin-left: 0; }

/* Cover made from type instead of a photo (home page and cards) */
.stat-cover {
  display: flex; flex-direction: column; justify-content: center; gap: 8px;
  height: 100%; padding: 8%;
  background: var(--brand-dark); color: #fff;
}
.stat-cover-value {
  font-size: clamp(1.75rem, 5vw, 3.5rem); font-weight: 600;
  letter-spacing: -0.03em; line-height: 1;
  color: var(--brand-soft);
}
.stat-cover-label { font-size: clamp(0.8125rem, 1.4vw, 1rem); opacity: 0.8; }
.card .stat-cover { aspect-ratio: 1 / 1; height: auto; }
.card .stat-cover-value { font-size: clamp(1.5rem, 3vw, 2rem); }

/* Version timeline: four releases instead of five signals */
.timeline .tl-when { order: -1; font-size: 0.8125rem; color: var(--brand, var(--muted)); font-weight: 600; }
.tl-note { color: var(--muted); font-size: 0.875rem; }
@media (min-width: 760px) {
  .timeline.versions { grid-template-columns: repeat(4, 1fr); }
}

/* Small label above the TL;DR statement */
.step {
  color: var(--muted);
  font-size: 0.8125rem; font-weight: 600; line-height: 1.4;
  text-transform: uppercase; letter-spacing: 0.08em;
  margin: 0 0 12px;
}

/* Headings that follow a paragraph or list inside the same section */
.section p + h2,
.section ul + h2 { margin-top: 40px; }

/* Executive summary statement under a case study header */
.impact {
  max-width: var(--text);
  margin: 0 auto clamp(48px, 8vw, 96px);
}
.impact .step { margin-bottom: 8px; }
.impact-text {
  font-size: 1.25rem;
  line-height: 1.45; margin: 0;
}
.impact-text strong { color: var(--ink); font-weight: 600; }

/* Bulleted list with bold lead-ins, e.g. the Mercator "my focus was" list */
.section .focus-list { margin: 20px 0 0; padding-left: 1.25em; }
.section .focus-list li { margin-bottom: 20px; }

/* Numbered goal headings, e.g. "1. Find — Search and find project leads" */
.section .goal-head { font-size: 1.0625rem; font-weight: 600; line-height: 1.35; margin: 0 0 6px; }
.section p + .goal-head { margin-top: 24px; }
.section .goal-head + p + p { margin-top: 32px; }