/* yinuoyin.com — one stylesheet, no build step */
:root {
  --ink: #161616;
  --muted: #5c5c5c;
  --line: #e4e2de;
  --paper: #ffffff;
  --wash: #f6f4f1;
  --accent: #b4491f;      /* terracotta */
  --accent-soft: #f4e3db;
  --slate: #2f6f9f;       /* second series (validated with accent) */
  --radius: 16px;
  --max: 1080px;
  --display: "Rubik", system-ui, sans-serif;
  --mono: "Roboto Mono", ui-monospace, monospace;
  --body: "Rubik", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--body);
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- top nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; justify-content: space-between; align-items: center; height: 56px; }
.nav a { text-decoration: none; font: 500 13px var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.nav .links { display: flex; gap: 20px; }
.nav .links a:hover { color: var(--accent); }

/* ---------- full-screen panels + scroll cue ---------- */
.panel { min-height: 100vh; min-height: 100svh; position: relative; display: flex; flex-direction: column; justify-content: center; padding: 72px 0 96px; }
.scroll-cue {
  position: absolute; left: 50%; bottom: 24px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  font: 500 12px var(--mono); letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); text-decoration: none;
}
.scroll-cue .arrow { font-size: 20px; line-height: 1; animation: nudge 1.8s ease-in-out infinite; }
.scroll-cue:hover { color: var(--accent); }
@keyframes nudge { 0%,100% { transform: translateY(0); } 50% { transform: translateY(6px); } }
@media (prefers-reduced-motion: reduce) { .scroll-cue .arrow { animation: none; } }

/* ---------- hero ---------- */
.hero .wrap { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.hero h1 { font: 800 clamp(40px, 6vw, 64px)/1.02 var(--display); text-transform: uppercase; margin: 0 0 16px; letter-spacing: -.01em; }
.eyebrow { font: 500 13px var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0 0 12px; }
.hero .role { font: 600 15px var(--mono); letter-spacing: .08em; text-transform: uppercase; margin: 0 0 20px; }
.hero .pitch { font-size: 19px; color: #3a3a3a; max-width: 44ch; margin: 0 0 12px; }
.hero .pitch-note { font-size: 16px; color: var(--muted); max-width: 44ch; margin: 0 0 28px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn {
  display: inline-block; padding: 10px 22px; border-radius: 999px;
  background: var(--ink); color: #fff; text-decoration: none;
  font: 600 14px var(--mono); letter-spacing: .04em;
}
.btn:hover { background: var(--accent); }
.btn.ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--ink); }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); background: transparent; }
.hero-art { border-radius: 24px; background: var(--wash); padding: 24px; }

/* ---------- section headings ---------- */
.section-title { font: 800 28px var(--display); text-transform: uppercase; margin: 0 0 8px; }
.section-sub { color: var(--muted); margin: 0 0 40px; max-width: 60ch; }

/* ---------- project cards ---------- */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px 32px; }
.card { text-decoration: none; display: block; }
.card .thumb { border-radius: var(--radius); overflow: hidden; background: var(--wash); aspect-ratio: 16 / 10; display: grid; place-items: center; transition: transform .2s ease; }
.card .thumb svg { width: 100%; height: 100%; }
.card:hover .thumb { transform: translateY(-3px); }
.card h3 { font: 700 19px var(--mono); margin: 16px 0 4px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .tag { font: 500 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }

.also { margin-top: 56px; padding-top: 32px; border-top: 1px solid var(--line); }
.also h3 { font: 700 15px var(--mono); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 16px; }
.also ul { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 32px; }
.also li { font-size: 15px; color: var(--muted); }
.also li b { color: var(--ink); font-weight: 600; }

/* ---------- experience ---------- */
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li { display: grid; grid-template-columns: 180px 1fr; gap: 24px; padding: 20px 0; border-top: 1px solid var(--line); }
.timeline .when { font: 500 14px var(--mono); color: var(--muted); }
.timeline h3 { margin: 0; font: 600 18px var(--display); }
.timeline p { margin: 4px 0 0; color: var(--muted); font-size: 15px; }

/* ---------- case study pages ---------- */
.case-head { padding: 72px 0 32px; }
.case-head h1 { font: 800 clamp(32px, 5vw, 48px)/1.08 var(--display); margin: 0 0 20px; }
.lead { font-size: 20px; line-height: 1.55; max-width: 62ch; margin: 0; }
.meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 36px 0 0; padding: 20px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.meta dt { font: 500 12px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.meta dd { margin: 4px 0 0; font-size: 15px; }
.prose { max-width: 70ch; }
.prose h2 { font: 700 22px var(--display); margin: 56px 0 12px; }
.prose p, .prose li { color: #2b2b2b; }
.prose ol, .prose ul { padding-left: 22px; }
.prose li { margin-bottom: 10px; }
.figure { margin: 36px 0; }
.figure .frame { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; background: #fff; }
.figure figcaption { font: 400 13px var(--mono); color: var(--muted); margin-top: 10px; }
.placeholder { border: 1.5px dashed #cfcac3; border-radius: var(--radius); background: var(--wash); padding: 40px 24px; text-align: center; font: 500 13px var(--mono); color: var(--muted); }
.todo { background: #fff4c2; padding: 0 4px; border-radius: 3px; font-size: .92em; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 12px 0 0; }
.chips li { font: 500 13px var(--mono); padding: 4px 12px; border-radius: 999px; background: var(--accent-soft); color: #7a2f12; margin: 0; }
.pager { display: flex; justify-content: space-between; gap: 16px; margin: 72px 0 0; padding: 24px 0; border-top: 1px solid var(--line); font: 500 14px var(--mono); }
.pager a { text-decoration: none; }
.pager a:hover { color: var(--accent); }

/* ---------- footer ---------- */
footer { padding: 40px 0; border-top: 1px solid var(--line); font: 400 13px var(--mono); color: var(--muted); }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

/* ---------- small screens ---------- */
@media (max-width: 760px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .nav .links { gap: 12px; }
  .nav .links a { font-size: 11px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 32px; }
  .hero-art { order: -1; max-width: 360px; }
  .cards, .also ul { grid-template-columns: 1fr; }
  .timeline li { grid-template-columns: 1fr; gap: 4px; }
  .meta { grid-template-columns: 1fr; gap: 12px; }
  .figure .frame { padding: 12px; overflow-x: auto; }
}

/* ---------- case study additions ---------- */
.step { display: inline-grid; place-items: center; width: 28px; height: 28px; margin-right: 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font: 600 14px var(--mono); vertical-align: 3px; }
.prose h2[id] { scroll-margin-top: 72px; }
.detail { font-size: 15.5px; color: #3a3a3a; border-left: 2px solid var(--line); padding-left: 16px; }
.detail strong { font: 600 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-right: 4px; }
.system .frame { padding: 12px; }
.system svg a rect { transition: stroke .15s ease, stroke-width .15s ease; }
.system svg a:hover rect, .system svg a:focus rect { stroke: #b4491f; stroke-width: 2; }
.system svg a { cursor: pointer; }
@media (max-width: 760px) { .system svg { min-width: 680px; } .system figcaption::after { content: " Scroll sideways to see the full diagram."; } }

/* ---------- example output card ---------- */
.stat-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 24px; margin: 24px 0 8px; background: var(--wash); }
.stat-card-title { font: 600 12px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin: 0; }
.stat-card-sub { margin: 4px 0 16px; font-size: 15px; color: var(--muted); }
.stat-card dl { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 0; }
.stat-card dt { font: 500 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.stat-card dd { margin: 4px 0 0; font: 700 28px var(--display); color: var(--ink); }
@media (max-width: 760px) { .stat-card dl { grid-template-columns: repeat(2, 1fr); } }
.prose .stat-card-title { color: var(--accent); }

/* ---------- spec table + code-style figure ---------- */
.spec { width: 100%; border-collapse: collapse; margin: 16px 0 24px; font-size: 15px; }
.spec th { text-align: left; font: 500 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); padding: 8px 12px 8px 0; border-bottom: 1px solid var(--line); }
.spec td { padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec td:first-child { font-weight: 600; white-space: nowrap; }
.codeblock { border: 1px solid var(--line); border-radius: var(--radius); background: var(--wash); padding: 18px 20px; font-family: var(--mono); }
.prose .codeblock p { margin: 0; }
.prose .codeblock .cb-label { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-top: 12px; }
.prose .codeblock .cb-label:first-child { margin-top: 0; }
.prose .codeblock .cb-line { font-size: 14px; color: var(--ink); margin-top: 4px; }
.codeblock .cb-line span { display: inline-block; background: var(--accent-soft); color: #7a2f12; border-radius: 6px; padding: 1px 8px; margin: 2px 2px 2px 0; }
@media (max-width: 760px) { .spec td:first-child { white-space: normal; } }

/* ---------- photo figures and figure rows ---------- */
.frame.photo { padding: 0; overflow: hidden; }
.frame.photo img { width: 100%; }
.frame.photo.narrow { max-width: 560px; }
.fig-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin: 24px 0; }
.fig-row.three { grid-template-columns: repeat(3, 1fr); }
.fig-row .figure { margin: 0; }
.fig-row figcaption { font-size: 12px; line-height: 1.5; }
@media (max-width: 760px) { .fig-row, .fig-row.three { grid-template-columns: 1fr; } }
.fig-row .frame.photo img { aspect-ratio: 3 / 2; object-fit: cover; }

.mine { display: inline-block; vertical-align: 4px; margin-left: 8px; padding: 2px 10px; border-radius: 999px; background: var(--accent); color: #fff; font: 600 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; }

/* ---------- hero globe, social icons, more links ---------- */
.hero-art { position: relative; aspect-ratio: 1 / 1; padding: 0; }
#globe { width: 100%; height: 100%; display: block; cursor: grab; touch-action: pan-y; }
#globe:active { cursor: grabbing; }
.social { display: flex; gap: 14px; margin: 0 0 24px; }
.social a { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 999px; border: 1.5px solid var(--line); color: var(--ink); }
.social a:hover { border-color: var(--accent); color: var(--accent); }
.social svg { width: 18px; height: 18px; fill: currentColor; }
.more-links { margin: 40px 0 0; display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: baseline; font-size: 15px; }
.more-links span { font: 600 12px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.more-links a { color: var(--ink); text-decoration-color: var(--accent); text-underline-offset: 3px; }
.more-links a:hover { color: var(--accent); }

/* hero role on one line (wraps only on small screens) */
.hero .role { font-size: 13px; letter-spacing: .05em; white-space: nowrap; }
@media (max-width: 760px) { .hero .role { white-space: normal; } }
#experience.panel { min-height: auto; padding-bottom: 96px; }

/* ---------- resume page ---------- */
.resume { max-width: 860px; padding-top: 56px; padding-bottom: 40px; }
.resume-head h1 { font: 800 clamp(30px, 5vw, 42px)/1.1 var(--display); margin: 0 0 8px; }
.resume-contact { color: var(--muted); font-size: 15px; margin: 0 0 8px; }
.resume-contact a { color: inherit; }
.resume h2 { font: 600 13px var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 40px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.job { margin: 0 0 22px; }
.job-top, .job-role { display: flex; justify-content: space-between; gap: 16px; }
.job-top h3 { margin: 0; font: 600 17px var(--display); }
.job-top span, .job-role span:last-child { font: 400 13px var(--mono); color: var(--muted); white-space: nowrap; }
.job-role { font-size: 15px; margin-top: 2px; }
.job ul, .resume ul.plain { margin: 8px 0 0; padding-left: 20px; }
.job li, .resume ul.plain li { font-size: 15px; line-height: 1.55; margin-bottom: 6px; }
.see { font: 500 12px var(--mono); color: var(--accent); white-space: nowrap; text-decoration: none; }
.skills { margin: 0; }
.skills div { display: grid; grid-template-columns: 190px 1fr; gap: 16px; padding: 6px 0; }
.skills dt { font-weight: 600; font-size: 15px; }
.skills dd { margin: 0; font-size: 15px; }
.resume-actions { margin: 32px 0 0; }
@media (max-width: 760px) { .job-top, .job-role { flex-direction: column; gap: 0; } .skills div { grid-template-columns: 1fr; gap: 2px; } }
@media print {
  .nav, footer, .resume-actions, .see { display: none !important; }
  html, body { font-size: 8.4pt; line-height: 1.28; }
  .wrap { padding: 0; }
  .resume { padding: 0; max-width: none; }
  .resume-head h1 { font-size: 16pt; margin: 0 0 1pt; }
  .resume-contact { font-size: 8.4pt; margin: 0; }
  .resume h2 { font-size: 8pt; margin: 6pt 0 3pt; padding-bottom: 1.5pt; }
  .job { margin: 0 0 4pt; break-inside: avoid; }
  .job-top h3 { font-size: 9.4pt; }
  .job-top span, .job-role span:last-child { font-size: 8pt; }
  .job-role { font-size: 8.6pt; margin-top: 0; line-height: 1.25; }
  .job ul, .resume ul.plain { margin-top: 2pt; padding-left: 11pt; }
  .job li, .resume ul.plain li, .skills dd, .skills dt { font-size: 8.3pt; line-height: 1.28; margin-bottom: 0.6pt; }
  .skills div { grid-template-columns: 105pt 1fr; gap: 6pt; padding: 0.5pt 0; }
  /* the printed page is narrower than the phone breakpoint: keep desktop layout */
  .job-top, .job-role { flex-direction: row !important; gap: 12pt !important; }
  .skills div { grid-template-columns: 105pt 1fr !important; gap: 6pt !important; }
  .resume-head, .resume section { margin-left: 0; margin-right: 0; }
  a { color: inherit; text-decoration: none; }
  @page { size: letter; margin: 0.4in 0.45in; }
}

/* ---------- one-screen home page (desktop / laptop) ---------- */
.count { font: 500 13px var(--mono); letter-spacing: .08em; text-transform: none; color: var(--accent); vertical-align: middle; margin-left: 10px; }
.work-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; }
.work-head .section-sub { margin-bottom: 0; }
.rail-nav { display: flex; gap: 8px; flex: none; }
.rail-btn { width: 38px; height: 38px; border-radius: 999px; border: 1.5px solid var(--line); background: #fff; color: var(--ink); font: 500 16px var(--mono); cursor: pointer; }
.rail-btn:hover { border-color: var(--accent); color: var(--accent); }
.rail { display: flex; gap: 24px; overflow-x: auto; scroll-snap-type: x mandatory; padding: 20px 2px 12px; margin-top: 8px; scrollbar-width: thin; scrollbar-color: var(--line) transparent; -webkit-mask-image: linear-gradient(to right, #000 88%, transparent); mask-image: linear-gradient(to right, #000 88%, transparent); }
.rail .card { flex: 0 0 clamp(240px, 27vw, 330px); scroll-snap-align: start; }
.rail .card:last-child { margin-right: 12%; }
.rail .card .thumb { aspect-ratio: auto; height: clamp(120px, 26vh, 220px); }
.rail .card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.rail .card h3 { font-size: 16px; margin: 10px 0 2px; }
.rail .card p { font-size: 14px; line-height: 1.45; }
.rail .card .tag { font-size: 11px; display: block; margin-top: 10px; }
.work-foot { margin-top: 12px; border-top: 1px solid var(--line); padding-top: 12px; }
.more-links.small { margin: 0 0 6px; font-size: 13px; }
.also-line { margin: 0; font-size: 13px; color: var(--muted); line-height: 1.5; }
.also-line span, .more-links.small span { font: 600 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-right: 10px; }
.screen-foot { margin: 0; text-align: center; font: 400 12px var(--mono); color: var(--muted); }

@media (min-width: 761px) and (min-height: 560px) {
  html { scroll-snap-type: y mandatory; scroll-padding-top: 56px; }
  .screen { height: calc(100vh - 56px); height: calc(100svh - 56px); min-height: 0; padding: 24px 0 64px; overflow: hidden; scroll-snap-align: start; }
  #experience.screen { padding-bottom: 24px; justify-content: space-between; }
  #experience.screen > .wrap { margin-top: auto; margin-bottom: auto; width: 100%; }
  #experience .timeline li { padding: clamp(8px, 1.6vh, 18px) 0; }
  #experience .section-sub { margin-bottom: clamp(12px, 3vh, 40px); }
}
@media (max-width: 760px), (max-height: 559px) {
  .rail .card { flex-basis: 78vw; }
  .rail .card .thumb { height: auto; aspect-ratio: 16 / 10; }
  .work-head { align-items: flex-start; }
  .rail-nav { display: none; }
}