/* Vorzayn — Volodymyr Zavrazhyn — personal site
   Swiss / minimal, warm paper + deep ink, JetBrains Mono labels. */

:root{
  --paper: #FAF8F4;
  --paper-rgb: 250, 248, 244;
  --ink: #1A1A1A;
  --ink-2: #6B6660;
  --rule: rgba(0,0,0,0.10);
  --rule-strong: rgba(0,0,0,0.22);
  --surface: #F2EFE8;
  --accent: #C96442;
  --btn-primary: #1A1A1A;
  --btn-primary-fg: #FAF8F4;

  --site-sans: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --site-display: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --site-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
html, body{ margin: 0; padding: 0; background: var(--paper); }
body{
  font-family: var(--site-sans);
  -webkit-font-smoothing: antialiased;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: -0.005em;
  min-height: 100vh;
}
a{ color: inherit; }
ul{ list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4, p{ margin: 0; }
button{ font: inherit; }
img{ max-width: 100%; }

/* ── buttons ─────────────────────────────────────────────────────────── */

.vz-btn, .vz-submit{
  appearance: none;
  -webkit-appearance: none;
  border-radius: 0;
}
.vz-btn{
  font-family: var(--site-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 12px 16px;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--rule-strong);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease;
}
.vz-btn:hover{ filter: brightness(0.95); transform: translateY(-1px); }
.vz-btn.primary{
  background: var(--btn-primary);
  color: var(--btn-primary-fg);
  border-color: var(--btn-primary);
}
.vz-btn.secondary{
  background: var(--surface);
  border-style: dashed;
  border-color: var(--rule-strong);
  color: var(--ink);
}
.vz-btn.full{ width: 100%; justify-content: center; }

/* ── kicker / section head ───────────────────────────────────────────── */

.kicker{
  font-family: var(--site-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 28px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.kicker.dark{
  color: rgba(255,255,255,0.55);
  border-bottom-color: rgba(255,255,255,0.18);
}
.section-head{
  padding: 64px 56px 24px;
  border-top: 1px solid var(--rule-strong);
}
.section-head.dark{ border-top-color: rgba(255,255,255,0.18); }
.section-head p{
  font-family: var(--site-display);
  font-weight: 300;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  max-width: 52ch;
  margin: 0;
  color: var(--ink);
  text-wrap: pretty;
}
.section-head.dark p{ color: var(--paper); }

/* ── nav ──────────────────────────────────────────────────────────────── */

.nav{
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 18px 56px;
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(var(--paper-rgb), 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.nav-brand{
  font-family: var(--site-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.nav-brand-dot{
  display: inline-block;
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(var(--paper-rgb), 1);
}
.nav-links{
  display: flex; gap: 28px; justify-content: center;
  font-family: var(--site-mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase;
}
.vz-navlink{
  position: relative; padding-bottom: 4px; color: var(--ink-2); text-decoration: none;
  transition: color 160ms ease;
}
.vz-navlink::after{
  content: ''; position: absolute; left: 0; right: 0; bottom: 0;
  height: 1px; background: var(--accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform 220ms ease;
}
.vz-navlink:hover::after,
.vz-navlink.active::after{ transform: scaleX(1); }
.vz-navlink.active{ color: var(--ink); }
.nav-actions{ display: flex; align-items: center; gap: 10px; }
.lang-toggle{
  font-family: var(--site-mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  background: transparent; border: 1px solid var(--rule-strong); color: var(--ink);
  padding: 7px 11px; border-radius: 0;
  display: inline-flex; align-items: center;
}
.lang-toggle a{ color: inherit; text-decoration: none; opacity: 0.35; transition: opacity 160ms ease; }
.lang-toggle a:hover{ opacity: 0.7; }
.lang-toggle span.active{ opacity: 1; }
.lang-toggle .sep{ margin: 0 6px; opacity: 0.4; }

/* ── placeholder ──────────────────────────────────────────────────────── */

.placeholder{
  width: 100%;
  position: relative;
  background: repeating-linear-gradient(135deg, rgba(0,0,0,0.025) 0 8px, rgba(0,0,0,0.06) 8px 16px);
  border: 0.5px solid rgba(0,0,0,0.12);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.placeholder-label{
  font-family: var(--site-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(0,0,0,0.55);
  background: rgba(250,248,244,0.85);
  padding: 4px 8px;
  backdrop-filter: blur(2px);
}

/* ── hero ─────────────────────────────────────────────────────────────── */

.hero{ padding: 56px 56px 96px; }
.hero-grid{ display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: start; }
.hero h1{
  font-family: var(--site-display); font-weight: 400;
  font-size: clamp(56px, 7.8vw, 124px); line-height: 0.9; letter-spacing: -0.028em;
  margin: 0 0 32px; color: var(--ink);
}
.hero h1 em{ font-style: italic; font-weight: 300; }
.hero-vectors{
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 0 0 40px;
  font-family: var(--site-mono); font-size: 12px; letter-spacing: 0.04em;
}
.hero-vectors li{
  border: 1px solid var(--rule-strong); padding: 6px 12px; color: var(--ink); text-transform: lowercase;
}
.hero-blurb{
  font-family: var(--site-display); font-weight: 300; font-size: 24px; line-height: 1.32;
  letter-spacing: -0.01em; max-width: 34ch; color: var(--ink); margin: 0 0 36px;
  text-wrap: pretty;
}
.hero-ctas{ display: flex; gap: 12px; flex-wrap: wrap; }

/* ── products ─────────────────────────────────────────────────────────── */

.products-wrap{ padding: 24px 56px 96px; }
.products-grid{
  display: grid; grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--rule-strong);
}
.product-card{
  padding: 40px 32px;
  border-bottom: 1px solid var(--rule);
  display: grid; grid-template-rows: auto auto auto 1fr auto; gap: 18px;
  transition: background 200ms ease;
}
.product-card:nth-child(odd){ border-right: 1px solid var(--rule); }
.product-card:hover{ background: var(--surface); }
.product-head{ display: flex; justify-content: space-between; align-items: baseline; }
.product-num{
  font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--ink-2); text-transform: uppercase;
}
.product-active{
  font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--accent); text-transform: uppercase;
  transform: translateX(-6px); opacity: 0; transition: all 200ms ease;
}
.product-card:hover .product-active{ transform: translateX(0); opacity: 1; }
.product-card h3{
  font-family: var(--site-display); font-weight: 400; font-size: clamp(28px, 3vw, 42px); line-height: 1.0;
  letter-spacing: -0.025em; margin: 0; color: var(--ink);
}
.product-card p{ margin: 0; color: var(--ink); font-size: 14.5px; line-height: 1.55; text-wrap: pretty; }
.product-ctas{ display: flex; gap: 10px; flex-wrap: wrap; padding-top: 8px; }

/* ── projects ─────────────────────────────────────────────────────────── */

.projects-wrap{ padding: 0 56px 96px; }
.project-row{
  display: grid; grid-template-columns: 64px 1.1fr 1.4fr 1fr auto; gap: 28px; align-items: center;
  padding: 32px 16px; border-top: 1px solid var(--rule); transition: background 200ms ease; cursor: pointer;
}
.project-row:last-child{ border-bottom: 1px solid var(--rule); }
.project-row:hover{ background: var(--surface); }
.project-num{ font-family: var(--site-mono); font-size: 12px; letter-spacing: 0.14em; color: var(--ink-2); }
.project-row h3{
  font-family: var(--site-display); font-weight: 400; font-size: clamp(22px, 2.6vw, 36px); line-height: 1.0;
  letter-spacing: -0.025em; margin: 0; color: var(--ink);
}
.project-row p{ margin: 0; color: var(--ink-2); font-size: 14.5px; line-height: 1.5; text-wrap: pretty; }
.project-thumb{ width: 100%; }
.project-cta{
  font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--rule-strong); padding-bottom: 3px;
  white-space: nowrap; transition: border-color 200ms ease;
}
.project-row:hover .project-cta{ border-color: var(--accent); }

/* ── certificates ─────────────────────────────────────────────────────── */

.certs-wrap{ padding: 24px 56px 96px; }
.certs-grid{ display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.vz-cert{ margin: 0; cursor: zoom-in; }
.vz-cert figcaption{
  margin-top: 14px; padding-top: 10px; border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between; align-items: baseline;
  transition: border-color 200ms ease;
}
.vz-cert:hover figcaption{ border-top-color: var(--accent); }
.cert-num{ font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--ink-2); text-transform: uppercase; }
.cert-title{ font-family: var(--site-display); font-weight: 400; font-size: 20px; letter-spacing: -0.01em; color: var(--ink); }

/* ── newspaper ────────────────────────────────────────────────────────── */

.paper-wrap{ padding: 16px 56px 96px; }
.paper-grid{
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  border-top: 1px solid var(--rule-strong); padding-top: 28px;
}
.vz-post{ display: flex; flex-direction: column; gap: 12px; cursor: pointer; }
.post-meta{
  font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.12em; color: var(--ink-2); text-transform: uppercase;
  display: flex; justify-content: space-between; padding-top: 4px; border-top: 1px solid var(--rule);
}
.vz-post h4{
  font-family: var(--site-display); font-weight: 400; font-size: 22px; line-height: 1.15; letter-spacing: -0.015em;
  margin: 0; color: var(--ink);
}
.vz-post:hover h4{ text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.vz-post p{ margin: 0; color: var(--ink-2); font-size: 13.5px; line-height: 1.5; }
.post-read{
  margin-top: auto; font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink);
}
.paper-footer{ display: flex; justify-content: space-between; align-items: center; margin-top: 48px; }
.paper-count{ font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--ink-2); text-transform: uppercase; }

/* ── contacts (dark band) ────────────────────────────────────────────── */

.contacts{ background: var(--ink); color: var(--paper); }
.contacts-grid{ display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; padding: 24px 56px 96px; }
.vz-contact-row{
  display: grid; grid-template-columns: 120px 1fr auto; align-items: baseline; gap: 16px;
  padding: 24px 0; border-top: 1px solid rgba(255,255,255,0.18);
  color: var(--paper); text-decoration: none; transition: padding 200ms ease;
}
.vz-contact-row:hover{ padding-left: 12px; }
.contact-label{ font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: rgba(255,255,255,0.55); }
.contact-value{ font-family: var(--site-display); font-weight: 400; font-size: clamp(22px, 2.4vw, 32px); letter-spacing: -0.015em; }
.contact-arrow{ font-family: var(--site-mono); font-size: 14px; opacity: 0.6; }
.contacts-quote{
  margin-top: 32px; padding: 20px 0; border-top: 1px solid rgba(255,255,255,0.18);
  font-family: var(--site-display); font-style: italic; font-weight: 300; font-size: 18px; line-height: 1.4;
  color: rgba(255,255,255,0.7); max-width: 40ch;
}
.contact-form{ display: flex; flex-direction: column; gap: 22px; }
.field{ display: flex; flex-direction: column; gap: 6px; }
.field-label{
  font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(255,255,255,0.55); display: flex; justify-content: space-between;
  transition: color 160ms ease;
}
.field-label .error{ text-transform: none; letter-spacing: 0.04em; color: #FF8A6B; }
.field.has-error .field-label{ color: #FF8A6B; }
.field input{
  background: transparent; border: none; border-bottom: 1px solid rgba(255,255,255,0.3);
  padding: 12px 0; color: var(--paper); font-family: var(--site-display); font-size: 22px; letter-spacing: -0.01em;
  outline: none; transition: border-color 160ms ease; width: 100%;
}
.field input:focus{ border-bottom-color: rgba(255,255,255,0.7); }
.field.has-error input{ border-bottom-color: #FF8A6B; }
.form-actions{ display: flex; align-items: center; gap: 16px; margin-top: 12px; flex-wrap: wrap; }
.vz-submit{
  font-family: var(--site-mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  padding: 16px 24px; background: var(--btn-primary); color: var(--btn-primary-fg);
  border: none; cursor: pointer; display: inline-flex; align-items: center; gap: 12px;
  transition: transform 160ms ease, filter 160ms ease;
}
.vz-submit:hover{ filter: brightness(1.05); transform: translateY(-1px); }
.vz-submit .rule{ width: 18px; height: 1px; background: var(--btn-primary-fg); }
.sent-msg{
  font-family: var(--site-mono); font-size: 12px; letter-spacing: 0.1em; color: var(--accent); text-transform: uppercase;
  display: none;
}
.sent-msg.show{ display: inline; }

/* ── footer ───────────────────────────────────────────────────────────── */

.site-footer{
  padding: 28px 56px; border-top: 1px solid rgba(255,255,255,0.18);
  font-family: var(--site-mono); font-size: 11px; letter-spacing: 0.14em; color: rgba(255,255,255,0.5); text-transform: uppercase;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 16px;
}
.footer-version{ display: inline-flex; align-items: center; gap: 8px; justify-self: center; }
.footer-dot{ width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: inline-block; }
.footer-made{ text-align: right; }

/* ── responsive ───────────────────────────────────────────────────────── */

@media (max-width: 980px){
  .nav, .hero, .section-head, .products-wrap, .projects-wrap,
  .certs-wrap, .paper-wrap, .contacts-grid, .site-footer{
    padding-left: 28px; padding-right: 28px;
  }
  .hero-grid, .contacts-grid{ grid-template-columns: 1fr; }
  .products-grid{ grid-template-columns: 1fr; }
  .product-card:nth-child(odd){ border-right: none; }
  .certs-grid{ grid-template-columns: 1fr 1fr; }
  .paper-grid{ grid-template-columns: 1fr 1fr; }
  .project-row{ grid-template-columns: 40px 1fr auto; }
  .project-row p, .project-thumb{ display: none; }
}

@media (max-width: 620px){
  .nav-links{ display: none; }
  .certs-grid{ grid-template-columns: 1fr; }
  .paper-grid{ grid-template-columns: 1fr; }
  .hero h1{ font-size: 64px; }
}