/* =========================================================
   СХЕМА — token system
   Color: bg #0E1420, panel #131B2B, line #2A3A52,
          cyan #5EE6FF, amber #FFB648, text #E7EDF5, dim #8FA0B8
   Type: display Unbounded / body Manrope / mono JetBrains Mono
   ========================================================= */

:root {
  --bg: #0E1420;
  --panel: #131B2B;
  --panel-2: #18223A;
  --line: #2A3A52;
  --line-soft: #1C2740;
  --cyan: #5EE6FF;
  --amber: #FFB648;
  --text: #E7EDF5;
  --dim: #8FA0B8;

  --font-display: 'Unbounded', sans-serif;
  --font-body: 'Manrope', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --maxw: 1180px;
  --gutter: clamp(20px, 5vw, 64px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  position: relative;
}

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

a { color: inherit; text-decoration: none; }

.mono { font-family: var(--font-mono); letter-spacing: 0.02em; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

/* faint blueprint grid behind everything */
.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.35;
  mask-image: linear-gradient(to bottom, black 0%, black 60%, transparent 100%);
}

main, header, footer { position: relative; z-index: 1; }

/* ---------- header ---------- */
.site-header {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 20px var(--gutter);
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(14, 20, 32, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.main-nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  color: var(--dim);
}

.main-nav a { transition: color 0.2s ease; }
.main-nav a:hover { color: var(--cyan); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background: var(--cyan);
  color: #07121C;
}
.btn-primary:hover { transform: translateY(-1px); background: #7FECFF; }

.btn-ghost {
  border: 1px solid var(--line);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.header-cta { display: inline-flex; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 1.5px;
  background: var(--text);
  margin: 0 7px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: clamp(64px, 12vw, 140px) var(--gutter) clamp(80px, 10vw, 120px);
  max-width: var(--maxw);
  margin: 0 auto;
  overflow: hidden;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 480px;
  align-items: center;
  gap: 48px;
  position: relative;
  z-index: 2;
}

.hero-inner { max-width: 600px; position: relative; z-index: 2; }

.hero-diploma {
  flex-shrink: 0;
  position: relative;
  align-self: start;
  padding-top: 58px;
}
.hero-diploma img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
  display: block;
}

@media (max-width: 860px) {
  .hero-layout { grid-template-columns: 1fr; }
  .hero-diploma { display: none; }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--dim);
  margin: 0 0 28px;
  text-transform: uppercase;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}
.dot-amber { background: var(--amber); }
.dot-cyan { background: var(--cyan); }

.hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 6.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.01em;
  margin: 0 0 28px;
}

.cycle-wrap {
  display: inline-block;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.55em;
  vertical-align: middle;
  border-bottom: 2px solid var(--cyan);
  padding-bottom: 2px;
}

.hero-sub {
  font-size: 18px;
  color: var(--dim);
  max-width: 540px;
  margin: 0 0 40px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-trace {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  opacity: 0.55;
}
.hero-trace path { display: none; }
.hero-trace .node-cyan { display: none; }
.hero-trace path {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}
.hero-trace .node { stroke: none; }
.hero-trace .node-amber { fill: var(--amber); }
.hero-trace .node-cyan { fill: var(--cyan); }

/* decorative center spine between sections (desktop only) */
.spine { display: none; }

/* ---------- sections ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(56px, 8vw, 96px) var(--gutter);
  border-top: 1px solid var(--line-soft);
}

.section-eyebrow {
  color: var(--cyan);
  font-size: 13px;
  margin: 0 0 16px;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 42px);
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

.section-lead {
  color: var(--dim);
  max-width: 620px;
  font-size: 16px;
  margin: 0 0 36px;
}

/* ---------- services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  margin-top: 8px;
}

.service-card {
  background: var(--panel);
  padding: 28px 24px;
  transition: background 0.2s ease;
}
.service-card:hover { background: var(--panel-2); }

.service-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--amber);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 2px 8px;
  margin-bottom: 16px;
}

.service-card h3 {
  font-family: var(--font-display);
  font-size: 19px;
  margin: 0 0 10px;
}

.service-card p {
  color: var(--dim);
  font-size: 14.5px;
  margin: 0;
}

/* ---------- portfolio ---------- */
.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.filter-btn {
  background: none;
  border: 1px solid var(--line);
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.filter-btn:hover { border-color: var(--cyan); color: var(--text); }
.filter-btn.is-active {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #07121C;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.case-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-radius: 6px;
  padding: 24px;
  transition: transform 0.18s ease, border-color 0.18s ease;
}
.case-card:hover {
  transform: translateY(-3px);
  border-color: var(--cyan);
}

.case-stamp {
  position: absolute;
  top: 0;
  right: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0 6px 0 6px;
  padding: 4px 10px;
  background: var(--panel-2);
}

.case-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
}

.case-type {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  text-transform: uppercase;
}

.case-year {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--dim);
}

.case-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 0 0 4px;
  padding-right: 50px;
}

.case-client {
  color: var(--dim);
  font-size: 13px;
  margin: 0 0 16px;
}

.case-card dl {
  margin: 0 0 16px;
  font-size: 14px;
}
.case-card dt {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--dim);
  text-transform: uppercase;
  margin-top: 10px;
}
.case-card dd {
  margin: 4px 0 0;
  color: var(--text);
}

.case-stack {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.case-stack span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--dim);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 2px 8px;
}

.case-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  border-top: 1px solid var(--line-soft);
  padding-top: 14px;
  transition: gap 0.15s ease;
}
.case-link:hover { gap: 10px; }

.case-card.is-hidden { display: none; }

/* ---------- process ---------- */
.process-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.process-list li {
  display: flex;
  gap: 28px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
  align-items: flex-start;
}

.process-index {
  font-size: 13px;
  color: var(--cyan);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 4px 9px;
  flex-shrink: 0;
  margin-top: 2px;
}

.process-list h3 {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 0 0 6px;
}

.process-list p {
  color: var(--dim);
  margin: 0;
  max-width: 540px;
}

/* ---------- faq ---------- */
.faq-list {
  border-top: 1px solid var(--line-soft);
}

.faq-item {
  border-bottom: 1px solid var(--line-soft);
}

.faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 22px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 17px;
}
.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary:hover span:first-child { color: var(--cyan); }

.faq-icon {
  position: relative;
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}
.faq-icon::before,
.faq-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--cyan);
  transform: translate(-50%, -50%);
  transition: transform 0.2s ease;
}
.faq-icon::before { width: 12px; height: 1.5px; }
.faq-icon::after { width: 1.5px; height: 12px; }

.faq-item[open] .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg) scaleY(0); }

.faq-item p {
  color: var(--dim);
  max-width: 640px;
  margin: 0 0 24px;
  font-size: 15px;
}

/* ---------- contact ---------- */
.section-contact { border-bottom: 1px solid var(--line-soft); }

.contact-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- footer ---------- */
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding: 32px var(--gutter) 48px;
  max-width: var(--maxw);
  margin: 0 auto;
}
.site-footer .mono { color: var(--dim); font-size: 13px; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .main-nav, .header-cta { display: none; }
  .nav-toggle { display: flex; }

  .main-nav.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line-soft);
    padding: 16px var(--gutter) 24px;
    gap: 16px;
  }
}

@media (max-width: 540px) {
  .hero-title { font-size: clamp(32px, 9vw, 44px); }
  .process-list li { gap: 16px; }
}