/* Portfolio - Petr Kurkin
   Brutalist structure x friendly color. Tokens in :root. */

/* @font-face (self-hosted, latin woff2) */
@font-face { font-family: 'Anton'; font-style: normal; font-weight: 400; font-display: swap; src: url('/assets/fonts/Anton-400-latin.woff2') format('woff2'); }
@font-face { font-family: 'Space Grotesk'; font-style: normal; font-weight: 400 700; font-display: swap; src: url('/assets/fonts/SpaceGrotesk-latin.woff2') format('woff2'); }
@font-face { font-family: 'Space Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url('/assets/fonts/SpaceMono-400-latin.woff2') format('woff2'); }
@font-face { font-family: 'Space Mono'; font-style: normal; font-weight: 700; font-display: swap; src: url('/assets/fonts/SpaceMono-700-latin.woff2') format('woff2'); }

/* Design tokens */
:root {
  --bg: #FFFFFF; --bg-alt: #EBF0ED; --ink: #141414; --ink-muted: #5C5C5C;
  --accent: #F47920; --accent-2: #7A5CFF; --accent-3: #FFD400; --on-accent: #141414;
  --font-display: 'Anton', 'Arial Narrow', sans-serif;
  --font-body: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'Space Mono', ui-monospace, monospace;
  --fs-hero: clamp(2.75rem, 10vw, 7rem); --fs-h1: clamp(2rem, 5vw, 3.5rem);
  --fs-h2: clamp(1.5rem, 3vw, 2.25rem); --fs-body: 1rem; --fs-small: .875rem; --fs-label: .75rem;
  --s1: .5rem; --s2: 1rem; --s3: 1.5rem; --s4: 2.5rem; --s5: 4rem;
  --radius: 0; --border: 2px solid var(--ink);
  --container: 1200px; --gutter: clamp(1rem, 4vw, 2.5rem);
}

/* Reset / base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font-body); font-size: var(--fs-body); line-height: 1.55; color: var(--ink); background: var(--bg); -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3, h4, p { margin: 0; }
h1, h2, h3 { line-height: 1.02; letter-spacing: .01em; }

/* Layout primitives */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--s5); }
.section--alt { background: var(--bg-alt); }
.section--tight { padding-block: var(--s4); }

/* Typography */
.display { font-family: var(--font-display); font-weight: 400; text-transform: uppercase; }
.mono-label { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-muted); }
.lede { font-size: clamp(1.125rem, 2vw, 1.375rem); line-height: 1.5; max-width: 46ch; }

/* Header / nav */
.site-header { position: sticky; top: 0; z-index: 50; background: var(--bg); border-bottom: var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); min-height: 68px; }
.brand { font-family: var(--font-display); font-size: 1.5rem; text-transform: uppercase; letter-spacing: .02em; text-decoration: none; }
.brand span { color: var(--accent); }
.nav__links { display: flex; align-items: center; gap: var(--s3); }
.nav__links a { font-family: var(--font-mono); font-size: var(--fs-small); text-transform: uppercase; letter-spacing: .06em; text-decoration: none; }
.nav__links a:hover { color: var(--accent); }
.nav__toggle { display: none; font-family: var(--font-mono); font-size: var(--fs-small); text-transform: uppercase; background: var(--bg); border: var(--border); padding: .5em .9em; cursor: pointer; }

/* Buttons */
.btn { display: inline-block; font-family: var(--font-body); font-weight: 700; font-size: var(--fs-small); text-transform: uppercase; letter-spacing: .04em; text-decoration: none; padding: .85em 1.4em; border: var(--border); background: var(--accent); color: var(--on-accent); transition: transform .15s ease, box-shadow .15s ease; }
.btn:hover, .btn:focus-visible { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--ink); }
.btn--ghost { background: var(--bg); color: var(--ink); }
.btn--ink { background: var(--ink); color: var(--bg); }

/* Hero */
.hero { padding-block: clamp(4rem, 12vw, 8rem) var(--s5); }
.hero__eyebrow { margin-bottom: var(--s3); }
.hero__title { font-family: var(--font-display); font-size: var(--fs-hero); text-transform: uppercase; line-height: .92; }
.hero__title .accent { color: var(--accent); }
.hero__row { display: flex; flex-wrap: wrap; gap: var(--s3); align-items: flex-end; justify-content: space-between; margin-top: var(--s4); }
.hero__meta { font-family: var(--font-mono); font-size: var(--fs-small); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-muted); }

/* Metrics strip */
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); border: var(--border); }
.metric { padding: var(--s3); border-right: var(--border); }
.metric:last-child { border-right: 0; }
.metric__num { font-family: var(--font-display); font-size: var(--fs-h2); text-transform: uppercase; }
.metric__label { font-family: var(--font-mono); font-size: var(--fs-label); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-muted); margin-top: var(--s1); }

/* Work grid */
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: var(--s3); margin-bottom: var(--s4); }
.section-head h2 { font-family: var(--font-display); font-size: var(--fs-h2); text-transform: uppercase; }
.work-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s4) var(--s3); }
.work-card { display: block; text-decoration: none; border: var(--border); background: var(--bg); transition: transform .15s ease, box-shadow .15s ease; }
.work-card__media { aspect-ratio: 3 / 2; overflow: hidden; border-bottom: var(--border); }
.work-card__media img { width: 100%; height: 100%; object-fit: cover; }
.work-card__body { padding: var(--s3); }
.work-card__meta { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: var(--fs-label); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-muted); }
.work-card__title { font-family: var(--font-display); font-size: clamp(1.4rem, 2.4vw, 2rem); text-transform: uppercase; margin-top: var(--s1); line-height: 1; }
.work-card__desc { font-size: var(--fs-small); color: var(--ink-muted); margin-top: var(--s2); }
.work-card:hover { transform: translate(-3px, -3px); box-shadow: 6px 6px 0 var(--ink); }
.work-card:hover .work-card__title { color: var(--accent); }

/* Tags */
.tags { display: flex; flex-wrap: wrap; gap: var(--s1); }
.tag { font-family: var(--font-mono); font-size: var(--fs-label); text-transform: uppercase; letter-spacing: .04em; padding: .3em .7em; border: 1px solid var(--ink); }
.tag--accent { background: var(--accent); border-color: var(--accent); }

/* About / content blocks */
.prose { max-width: 68ch; }
.prose p + p { margin-top: var(--s3); }
.prose-lg { font-size: clamp(1.25rem, 2.4vw, 1.75rem); line-height: 1.4; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s4); }
.feature-list { list-style: none; margin: 0; padding: 0; }
.feature-list li { padding: var(--s2) 0; border-bottom: 1px solid var(--ink); display: flex; gap: var(--s2); }
.feature-list .num { font-family: var(--font-mono); color: var(--accent); }

/* Case study */
.case-hero { padding-block: clamp(3rem, 8vw, 6rem) var(--s4); }
.case-hero h1 { font-family: var(--font-display); font-size: var(--fs-h1); text-transform: uppercase; }
.case-meta { display: grid; grid-template-columns: repeat(3, auto); gap: var(--s3); margin-top: var(--s4); }
.case-meta dt { font-family: var(--font-mono); font-size: var(--fs-label); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-muted); }
.case-meta dd { margin: 0; font-weight: 600; }
.case-section { padding-block: var(--s4); border-top: var(--border); }
.case-section h2 { font-family: var(--font-display); font-size: var(--fs-h2); text-transform: uppercase; }
.case-index { font-family: var(--font-mono); color: var(--accent); margin-right: var(--s2); }
.case-figure { border: var(--border); aspect-ratio: 16 / 9; margin: var(--s3) 0; display: grid; place-items: center; background: var(--bg-alt); font-family: var(--font-mono); color: var(--ink-muted); }
.placeholder-note { background: var(--accent-3); border: var(--border); padding: var(--s2) var(--s3); font-family: var(--font-mono); font-size: var(--fs-small); }

/* Prev / next */
.case-nav { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s3); border: var(--border); }
.case-nav a { padding: var(--s3); text-decoration: none; display: flex; flex-direction: column; gap: var(--s1); }
.case-nav a:last-child { text-align: right; align-items: flex-end; border-left: var(--border); }
.case-nav .dir { font-family: var(--font-mono); font-size: var(--fs-label); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-muted); }
.case-nav .link { font-family: var(--font-display); font-size: var(--fs-h2); text-transform: uppercase; }
.case-nav a:hover .link { color: var(--accent); }

/* Utility heading */
.u-h2 { font-family: var(--font-display); text-transform: uppercase; font-size: var(--fs-h2); line-height: 1.05; }

/* Contact / footer */
.contact { background: var(--ink); color: var(--bg); }
.contact .mono-label { color: rgba(255, 255, 255, .6); }
.contact h2 { font-family: var(--font-display); font-size: var(--fs-h1); text-transform: uppercase; }
.contact a { color: var(--accent-3); }
.site-footer { background: var(--ink); color: rgba(255, 255, 255, .6); border-top: 2px solid rgba(255, 255, 255, .15); }
.footer-row { display: flex; flex-wrap: wrap; gap: var(--s2); justify-content: space-between; padding-block: var(--s3); font-family: var(--font-mono); font-size: var(--fs-label); text-transform: uppercase; letter-spacing: .06em; }
.footer-row a { text-decoration: none; }
.footer-row a:hover { color: var(--accent-3); }

/* Reveal on scroll (only hidden when JS is present) */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .5s ease, transform .5s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* Focus (a11y) */
a:focus-visible, .btn:focus-visible, button:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 2px; }

/* Responsive */
@media (max-width: 760px) {
  .work-grid { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr; }
  .metric { border-right: 0; border-bottom: var(--border); }
  .metric:last-child { border-bottom: 0; }
  .case-meta { grid-template-columns: 1fr; gap: var(--s2); }
  .case-nav { grid-template-columns: 1fr; }
  .case-nav a:last-child { border-left: 0; border-top: var(--border); text-align: left; align-items: flex-start; }
  .section-head { flex-direction: column; align-items: flex-start; }
  .nav__toggle { display: inline-block; }
  .nav__links { position: absolute; top: 100%; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; background: var(--bg); border-bottom: var(--border); }
  .nav__links.is-open { display: flex; }
  .nav__links a { padding: var(--s2) var(--gutter); border-top: 1px solid var(--ink); }
  .hero__row { flex-direction: column; align-items: flex-start; }
}