/* ==========================================================================
   Северный контур — проектное бюро
   Один файл, без внешних зависимостей.
   ========================================================================== */

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- темы ---------- */

:root {
  color-scheme: light;

  --bg: #f5f4ef;
  --bg-alt: #eeece5;
  --surface: #fffefa;
  --text: #14181a;
  --muted: #5c6663;
  --line: #dbd7cd;
  --line-strong: #c3bfb3;
  --accent: #12584a;
  --accent-hover: #0c4137;
  --accent-soft: rgba(18, 88, 74, 0.07);
  --on-accent: #f6faf8;
  --grid: rgba(20, 24, 26, 0.045);
  --shadow: 0 1px 0 rgba(20, 24, 26, 0.03);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-serif: Georgia, "Iowan Old Style", "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --wrap: 1120px;
  --header-h: 68px;
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0e1213;
  --bg-alt: #121819;
  --surface: #151c1d;
  --text: #e7ecea;
  --muted: #93a19c;
  --line: #242c2d;
  --line-strong: #33403f;
  --accent: #7cc4ae;
  --accent-hover: #9ad8c4;
  --accent-soft: rgba(124, 196, 174, 0.09);
  --on-accent: #0b1512;
  --grid: rgba(231, 236, 234, 0.05);
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.4);
}

/* ---------- база ---------- */

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { text-decoration-color: var(--accent); }

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

ul, ol { margin: 0; padding: 0; }
li { list-style: none; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

::selection {
  background: var(--accent);
  color: var(--on-accent);
}

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

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 12px 18px;
  background: var(--accent);
  color: var(--on-accent);
  text-decoration: none;
  transition: top 0.15s ease;
}

.skip-link:focus { top: 12px; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.78em;
  letter-spacing: 0.04em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent);
  flex: 0 0 auto;
}

.lead {
  font-size: 1.14rem;
  line-height: 1.6;
  color: var(--muted);
  max-width: 60ch;
}

/* ---------- шапка ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  flex: 0 0 auto;
}

.brand-mark {
  width: 34px;
  height: 34px;
  color: var(--accent);
  transition: transform 0.25s ease;
}

/* Штрихи внутри знака берут цвет фона темы — иначе в тёмной теме
   светлые полосы почти сливаются со светло-зелёным квадратом. */
.brand-mark g { fill: var(--on-accent); }

.brand:hover .brand-mark { transform: rotate(-4deg); }

.brand-text { display: flex; flex-direction: column; line-height: 1.1; }

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  letter-spacing: 0.01em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 3px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.site-nav a {
  position: relative;
  padding: 8px 12px;
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--muted);
  transition: color 0.15s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s var(--ease);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] { color: var(--text); }

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after { transform: scaleX(1); }

.header-tools {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.lang {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--muted);
  padding: 8px 10px;
  border: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.lang:hover { color: var(--text); border-color: var(--line-strong); }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.icon-btn:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.icon-btn svg { width: 18px; height: 18px; }

.theme-toggle .i-sun { display: none; }
.theme-toggle .i-moon { display: block; }

:root[data-theme="dark"] .theme-toggle .i-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .i-moon { display: none; }

.nav-toggle { display: none; }

/* ---------- герой ---------- */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px);
  background-size: 88px 100%;
  background-position: calc(50% - 44px) 0;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 72px;
  align-items: end;
  padding: 104px 0 80px;
}

.hero h1 {
  margin: 22px 0 26px;
  font-size: clamp(2.35rem, 4.6vw, 3.6rem);
  line-height: 1.04;
  max-width: 15ch;
}

.hero .lead { margin-bottom: 34px; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text);
  font-size: 0.95rem;
  text-decoration: none;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.btn:hover { border-color: var(--text); }

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}

.btn--primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--on-accent);
}

.btn .arrow { transition: transform 0.2s ease; }
.btn:hover .arrow { transform: translateX(3px); }

/* карточка-спецификация */

.spec {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 26px 28px;
  box-shadow: var(--shadow);
}

.spec-title {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 14px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--line);
}

.spec dl { margin: 0; }

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 18px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
}

.spec-row:last-child { border-bottom: 0; padding-bottom: 0; }

.spec dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.spec dd {
  margin: 0;
  font-size: 0.9rem;
  text-align: right;
}

/* ---------- секции ---------- */

.section { padding: 88px 0; }
.section + .section { border-top: 1px solid var(--line); }

.section-head {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  margin-bottom: 56px;
}

.section-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  max-width: 22ch;
}

.section-head .side {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 8px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.section-head .side .n { color: var(--accent); }

.section-foot {
  margin-top: 44px;
  display: flex;
  justify-content: flex-end;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 3px;
  font-size: 0.95rem;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.text-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* ---------- карточки услуг ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.card {
  background: var(--surface);
  padding: 30px 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background 0.2s ease;
}

.card:hover { background: var(--bg-alt); }

.card-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.card h3 {
  font-size: 1.22rem;
  line-height: 1.2;
}

.card p {
  font-size: 0.93rem;
  color: var(--muted);
  margin: 0;
}

.card ul {
  margin-top: 4px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.card li {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 3px 8px;
}

/* ---------- процесс ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 40px 32px;
}

.step {
  padding-top: 22px;
  border-top: 1px solid var(--line-strong);
  position: relative;
}

.step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 42px;
  height: 1px;
  background: var(--accent);
}

.step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.step h3 {
  font-size: 1.1rem;
  margin: 10px 0 8px;
}

.step p {
  font-size: 0.92rem;
  color: var(--muted);
  margin: 0;
}

/* ---------- проекты ---------- */

.cases { border-top: 1px solid var(--line); }

.case {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr) 220px;
  gap: 32px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  text-decoration: none;
  transition: background 0.2s ease;
}

.case:hover { background: var(--accent-soft); }

.case-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  line-height: 1.7;
}

.case h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.case p {
  font-size: 0.93rem;
  color: var(--muted);
  margin: 0;
  max-width: 58ch;
}

.case-fact {
  font-size: 0.88rem;
  color: var(--text);
  border-left: 1px solid var(--accent);
  padding-left: 16px;
  line-height: 1.5;
}

/* ---------- цифры ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.stat {
  background: var(--surface);
  padding: 28px 26px 30px;
}

.stat b {
  display: block;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}

.stat span {
  font-size: 0.86rem;
  color: var(--muted);
  line-height: 1.45;
  display: block;
}

/* ---------- CTA ---------- */

.cta {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: center;
}

.cta h2 {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  margin-bottom: 10px;
  max-width: 24ch;
}

.cta p {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
  max-width: 54ch;
}

/* ---------- подвал ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  margin-top: 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.7fr) minmax(0, 0.7fr);
  gap: 48px;
  padding: 60px 0 48px;
}

.footer-brand p {
  color: var(--muted);
  font-size: 0.9rem;
  max-width: 40ch;
  margin: 16px 0 0;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

.site-footer ul li { margin-bottom: 9px; }

.site-footer ul a {
  text-decoration: none;
  font-size: 0.93rem;
  color: var(--text);
  transition: color 0.15s ease;
}

.site-footer ul a:hover { color: var(--accent); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 20px 0 28px;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  color: var(--muted);
}

.footer-bottom a { text-decoration: none; }
.footer-bottom a:hover { color: var(--text); }

/* ---------- внутренние страницы ---------- */

.page-head {
  border-bottom: 1px solid var(--line);
  padding: 72px 0 56px;
  position: relative;
  overflow: hidden;
}

.page-head::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to right, var(--grid) 1px, transparent 1px);
  background-size: 88px 100%;
  background-position: calc(50% - 44px) 0;
  pointer-events: none;
}

.page-head .wrap { position: relative; }

.page-head h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 18px 0 20px;
  max-width: 20ch;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 22px;
}

.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { color: var(--text); }

.prose { max-width: 68ch; }
.prose p { font-size: 1.02rem; }
.prose h2 {
  font-size: 1.5rem;
  margin: 42px 0 14px;
}
.prose h3 {
  font-size: 1.16rem;
  margin: 30px 0 10px;
}
.prose ul { margin: 0 0 1.2em; }
.prose ul li {
  list-style: none;
  position: relative;
  padding-left: 22px;
  margin-bottom: 8px;
  font-size: 0.98rem;
  color: var(--muted);
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--accent);
}
.prose a { color: var(--accent); }

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}

.service-block {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 32px;
}

.service-block:first-of-type { border-top: 1px solid var(--line); }
.service-block:last-of-type { border-bottom: 0; }

.service-block .num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--accent);
  padding-top: 4px;
}

.service-block h2 { font-size: 1.45rem; margin-bottom: 12px; }
.service-block p { color: var(--muted); font-size: 0.97rem; max-width: 62ch; }

.deliverables {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.deliverables li {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 4px 9px;
}

.contact-card {
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 32px;
}

.contact-list dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 22px;
}

.contact-list dt:first-child { margin-top: 0; }

.contact-list dd {
  margin: 6px 0 0;
  font-size: 1rem;
}

.contact-list dd a {
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 1px;
}

.contact-list dd a:hover { border-color: var(--accent); color: var(--accent); }

.note {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 20px;
  color: var(--muted);
  font-size: 0.93rem;
  margin: 28px 0;
}

/* ---------- 404 ---------- */

.error-page {
  min-height: 62vh;
  display: flex;
  align-items: center;
  padding: 80px 0;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: 18px;
}

.error-page h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 18px;
}

/* ---------- адаптив ---------- */

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 72px 0 64px;
    align-items: start;
  }
  .hero h1 { max-width: 20ch; }
  .section-head { grid-template-columns: 1fr; gap: 18px; }
  .section-head .side { padding-top: 0; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case { grid-template-columns: 100px minmax(0, 1fr); }
  .case-fact { grid-column: 2; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .two-col { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }

  .wrap { padding: 0 20px; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 20px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    margin-left: 0;
  }

  .site-nav[data-open="true"] { display: flex; }

  .site-nav a {
    padding: 13px 4px;
    border-bottom: 1px solid var(--line);
    font-size: 1rem;
  }

  .site-nav a::after { display: none; }

  .header-tools { margin-left: auto; }

  .section { padding: 64px 0; }

  .stats { grid-template-columns: 1fr 1fr; }

  .case { grid-template-columns: 1fr; gap: 12px; }
  .case-fact { grid-column: 1; border-left: 0; border-top: 1px solid var(--line); padding: 12px 0 0; }

  .cta { grid-template-columns: 1fr; padding: 32px; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; padding: 44px 0 36px; }

  .service-block { grid-template-columns: 1fr; gap: 12px; }

  .page-head { padding: 52px 0 40px; }
}

@media (max-width: 420px) {
  .steps { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
}