/* ==========================================================================
   ODINN — design tokens
   Палитра и снимки сделаны от реальных материалов: холщовый фон предметной
   съёмки, матовый чёрный 3D-печатных деталей, красный — точный сэмпл с
   тормоза-обечайки (assets/img/about.jpg). Ничего не придумано абстрактно.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Unbounded:wght@500;700;900&family=Golos+Text:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* поверхности */
  --canvas: #EAE6DA;
  --canvas-raised: #F5F3EB;
  --paper: #17150F;
  --paper-raised: #211E16;

  /* текст */
  --ink: #1C1A14;
  --ink-soft: #5B5648;
  --ink-faint: #675F49;
  --on-paper: #EDE7D8;
  --on-paper-soft: #A39C89;

  /* линии */
  --line: #CFC7B0;
  --line-on-paper: #3A362A;

  /* акцент — сэмпл с реальной красной детали (обечайка, tild3161.../ob114.jpg) */
  --signal: #C9402F;
  --signal-bright: #E2543F;
  /* тот же оттенок, но затемнён под текст на светлом холсте — #C9402F
     сам по себе не дотягивает до 4.5:1 на --canvas в мелком кегле */
  --signal-text: #A8331F;

  /* типографика */
  --font-display: 'Unbounded', system-ui, sans-serif;
  --font-body: 'Golos Text', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', monospace;

  --text-hero: clamp(2.75rem, 2.1rem + 3vw, 4.75rem);
  --text-h1: clamp(2.1rem, 1.7rem + 1.8vw, 3.1rem);
  --text-h2: clamp(1.6rem, 1.4rem + 1vw, 2.1rem);
  --text-h3: clamp(1.15rem, 1.05rem + 0.4vw, 1.35rem);
  --text-body: 1.0625rem;
  --text-small: 0.9rem;
  --text-micro: 0.76rem;

  --container: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 3px;

  --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ==========================================================================
   Reset / base
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: light; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }

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

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.eyebrow--on-paper { color: var(--on-paper-soft); }
.eyebrow--hero { display: block; margin-bottom: 1rem; }
.eyebrow--about { display: block; margin-bottom: 0.8rem; }
.eyebrow--steps { display: inline-block; margin-top: 1.3rem; }

.h-display {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ==========================================================================
   Валькнут — фирменный знак, три сцепленных треугольника (узел Одина).
   Используется и как логотип, и как структурный мотив (водяной знак,
   маркер финального шага).
   ========================================================================== */

.valknut { display: block; }

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--canvas);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 0.9rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}
.brand .valknut { width: 26px; height: 26px; flex: none; }

.nav-primary {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-primary__links {
  display: flex;
  gap: 1.75rem;
}
.nav-primary__links a {
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--ink-soft);
  transition: color .18s var(--ease);
}
.nav-primary__links a:hover { color: var(--ink); }
.nav-primary__links a[aria-current="page"] { color: var(--ink); }

.nav-phone {
  font-family: var(--font-mono);
  font-size: var(--text-small);
  white-space: nowrap;
  border-left: 1px solid var(--line);
  padding-left: 1.5rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.4rem;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); display: block; }

@media (max-width: 780px) {
  .nav-phone { display: none; }
  .nav-toggle { display: flex; }
  .nav-primary {
    position: fixed;
    inset: 61px 0 0 0;
    background: var(--canvas);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem var(--gutter);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
  }
  .nav-primary.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .nav-primary__links {
    flex-direction: column;
    gap: 1.5rem;
  }
  .nav-primary__links a { font-size: 1.25rem; }
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.hero h1 {
  font-size: var(--text-hero);
  margin-bottom: 1.3rem;
}
.hero__lede {
  max-width: 46ch;
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin-bottom: 2.1rem;
}
.hero__actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--ink);
  color: var(--on-paper);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-small);
  padding: 0.95rem 1.5rem;
  border-radius: var(--radius);
  transition: background .18s var(--ease), transform .18s var(--ease);
}
.btn svg { transition: transform .18s var(--ease); }
.btn:hover { background: var(--signal); }
.btn:hover svg { transform: translateX(3px); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-small);
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
}
.link-arrow svg { transition: transform .18s var(--ease); }
.link-arrow:hover svg { transform: translateX(3px); }
.link-arrow:hover { color: var(--signal-text); border-color: var(--signal-text); }

/* framed фото — сигнатурная рамка с уголками-засечками, как отметки калибровки */
.framed {
  position: relative;
  padding: 14px;
}
.framed::before,
.framed::after,
.framed__corner {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  border: 1.5px solid var(--ink);
}
.framed::before { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.framed::after { bottom: 0; right: 0; border-left: 0; border-top: 0; }
.framed__corner--tr { top: 0; right: 0; border-left: 0; border-bottom: 0; }
.framed__corner--bl { bottom: 0; left: 0; border-right: 0; border-top: 0; }
.framed__media {
  overflow: hidden;
  background: var(--ink);
}
.framed__media img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.framed figcaption {
  margin-top: 0.8rem;
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: flex;
  justify-content: space-between;
}

.hero__frame .framed__media { aspect-ratio: 4 / 5; }

@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__frame { order: -1; max-width: 420px; }
}

/* ==========================================================================
   Секции — общие отступы
   ========================================================================== */

.section { padding-block: clamp(3rem, 7vw, 6rem); }
.section--tight { padding-block: clamp(2rem, 5vw, 3.5rem); }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
  margin-bottom: clamp(2rem, 4vw, 3rem);
  flex-wrap: wrap;
}
.section-head h2 { font-size: var(--text-h2); max-width: 22ch; }
.section-head .eyebrow { margin-bottom: 0.6rem; display: block; }
.section-lede {
  color: var(--ink-soft);
  max-width: 60ch;
  margin-bottom: 2.5rem;
}

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

/* ==========================================================================
   Каталог — карточки инструкций
   ========================================================================== */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 900px) {
  .card-grid { grid-template-columns: 1fr; max-width: 480px; }
}

.part-card {
  display: block;
  background: var(--canvas-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}
.part-card:hover { border-color: var(--ink); transform: translateY(-3px); }

.part-card__media {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--ink);
}
.part-card__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .5s var(--ease);
}
.part-card:hover .part-card__media img { transform: scale(1.045); }

.part-card__body { padding: 1.4rem 1.5rem 1.6rem; }
.part-card__body .eyebrow { display: block; margin-bottom: 0.55rem; }
.part-card__title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.35;
  margin-bottom: 1.1rem;
}
.part-card__go {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.part-card__go svg { transition: transform .18s var(--ease); }
.part-card:hover .part-card__go { color: var(--signal-text); }
.part-card:hover .part-card__go svg { transform: translateX(3px); }

/* ==========================================================================
   О нас
   ========================================================================== */

.about__grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.about__media .framed__media { aspect-ratio: 3 / 2; }
.about h2 { margin-bottom: 1.1rem; }
.about p { color: var(--ink-soft); }
.about p + p { margin-top: 1rem; }
@media (max-width: 860px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__media { max-width: 480px; }
}

/* ==========================================================================
   Хлебная крошка + шапка инструкции
   ========================================================================== */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 2rem;
  transition: color .18s var(--ease);
}
.back-link:hover { color: var(--signal-text); }
.back-link svg { transform: scaleX(-1); }

.manual-intro { padding-block: clamp(2rem, 5vw, 3.5rem) clamp(2.5rem, 5vw, 4rem); }
.manual-intro__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.manual-intro h1 { margin: 0.6rem 0 1.2rem; }
.manual-intro__lede {
  color: var(--ink-soft);
  max-width: 48ch;
  font-size: 1.05rem;
}
.manual-intro__cover .framed__media { aspect-ratio: 16 / 10; }
@media (max-width: 900px) {
  .manual-intro__grid { grid-template-columns: 1fr; }
  .manual-intro__cover { order: -1; }
}

/* ==========================================================================
   Сборочная линия — сигнатурный элемент страниц-инструкций.
   Шаги реально идут по порядку сборки, поэтому нумерация здесь несёт
   смысл, а не украшает: вертикальная линия — как след сборочного стапеля,
   от шага к шагу.
   ========================================================================== */

.steps {
  position: relative;
  padding-top: 0.5rem;
}
.steps::before {
  content: '';
  position: absolute;
  top: 30px;
  bottom: 30px;
  left: 27px;
  width: 1px;
  background: var(--line);
}

.step {
  position: relative;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 0 clamp(1.5rem, 4vw, 3.5rem);
  padding-block: clamp(2rem, 4vw, 2.75rem);
}
.step + .step { border-top: 1px solid var(--line); }

.step__tag {
  position: relative;
  z-index: 1;
  width: 54px; height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--on-paper);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.05rem;
  border-radius: var(--radius);
}
.step--final .step__tag {
  background: var(--signal);
  color: #fff;
}

.step__content {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}
.step--no-photo .step__content { grid-template-columns: 1fr; }

.step__title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.2rem;
  line-height: 1.4;
  margin-bottom: 0.65rem;
}
.step__caption { color: var(--ink-soft); }

.step__media {
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3 / 4;
  background: var(--ink);
}
.step__media img { width: 100%; height: 100%; object-fit: cover; }

@media (max-width: 760px) {
  .step { grid-template-columns: 44px 1fr; }
  .step__tag { width: 40px; height: 40px; font-size: 0.85rem; }
  .steps::before { left: 22px; }
  .step__content { grid-template-columns: 1fr; }
  .step__media { max-width: 320px; aspect-ratio: 4/5; margin-top: 0.5rem; }
}

.manual-outro {
  margin-top: clamp(2rem, 5vw, 3rem);
  padding: clamp(1.75rem, 4vw, 2.5rem);
  background: var(--canvas-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.manual-outro p { max-width: 42ch; color: var(--ink-soft); }
.manual-outro strong { color: var(--ink); font-weight: 700; }

/* ==========================================================================
   Инструкции — список (страница /manuals/)
   ========================================================================== */

.page-head {
  padding-block: clamp(2.5rem, 6vw, 4rem) clamp(1.5rem, 4vw, 2rem);
}
.page-head h1 { margin: 0.6rem 0 1rem; }
.page-head p { color: var(--ink-soft); max-width: 56ch; }

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--paper);
  color: var(--on-paper);
  position: relative;
  overflow: hidden;
}
.site-footer .valknut-mark {
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 420px;
  height: 420px;
  opacity: 0.05;
  pointer-events: none;
}
.site-footer__inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(3rem, 6vw, 5rem) 2rem;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 3rem;
}
.footer-brand { display: flex; align-items: center; gap: 0.6rem; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; margin-bottom: 1.1rem; }
.footer-brand .valknut { width: 26px; height: 26px; }
.footer-brand .valknut path,
.footer-brand .valknut polygon { fill: var(--on-paper); }
.site-footer p { color: var(--on-paper-soft); max-width: 34ch; }

.footer-col h3 {
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--on-paper-soft);
  margin-bottom: 1.1rem;
}
.footer-col ul { display: flex; flex-direction: column; gap: 0.7rem; }
.footer-col a { font-size: var(--text-small); transition: color .18s var(--ease); }
.footer-col a:hover { color: var(--signal-bright); }
.footer-contact { font-family: var(--font-mono); font-size: var(--text-small); }

.site-footer__bottom {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line-on-paper);
  padding-block: 1.5rem;
  display: flex;
  justify-content: space-between;
  font-size: var(--text-micro);
  color: var(--on-paper-soft);
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  flex-wrap: wrap;
  gap: 0.75rem;
}

@media (max-width: 760px) {
  .site-footer__inner { grid-template-columns: 1fr; gap: 2.25rem; }
}

/* ==========================================================================
   Утилиты
   ========================================================================== */

.stack-gap-sm > * + * { margin-top: 0.5rem; }