/* ИНЖЕНЕРНОЕ РЕШЕНИЕ — Стили */

/* Fonts: Big Shoulders (headings), IBM Plex Sans (body), IBM Plex Mono (code) */
/* font-display: swap задаётся через URL-параметр Google Fonts (&display=swap) */

/* Системный стек как fallback — минимизирует CLS до загрузки веб-шрифтов */

:root {
  --ink: #1a1818;
  --ink-soft: #4a4848;
  --ink-dim: #807e7e;
  --paper: #fefefe;
  --paper-line: #e8e6e6;
  --paper-fill: #f7f5f5;
  --accent: #d14343;
  --accent-hover: #b33737;
  --focus: #4a90e2;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  /* scroll-behavior управляется JS с учётом prefers-reduced-motion */
  scroll-padding-top: 80px;
}

body {
  font-family: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Big Shoulders Display', 'Big Shoulders', sans-serif;
  font-weight: 700;
  line-height: 1.15;
  margin: 0;
}

h1 { font-size: 3.2rem; }
h2 { font-size: 2.4rem; }
h3 { font-size: 1.6rem; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--accent-hover); }

.wrap {
  max-width: 1350px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--paper-line);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(8px);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}
.brand-mark {
  display: inline-block;
  width: 48px;
  height: 48px;
  background: var(--accent);
  color: var(--paper);
  font-family: 'Big Shoulders', sans-serif;
  font-weight: 700;
  font-size: 22px;
  line-height: 48px;
  text-align: center;
  border-radius: 2px;
  flex-shrink: 0;
}
.brand-text {
  font-family: 'Big Shoulders', sans-serif;
  font-size: 21px;
  font-weight: 700;
  line-height: 1.2;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.brand-text small {
  font-size: 12px;
  font-weight: 400;
  font-family: 'IBM Plex Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--ink-dim);
}

.main-nav {
  display: flex;
  gap: 32px;
  align-items: center;
}
.main-nav a {
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.15s;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--accent);
}

.header-cta {
  background: var(--accent);
  color: var(--paper);
  padding: 10px 20px;
  border-radius: 4px;
  font-weight: 500;
  font-size: 15px;
  white-space: nowrap;
  transition: background 0.15s;
}
.header-cta:hover {
  background: var(--accent-hover);
  color: var(--paper);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--paper-line);
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 4px;
  font-size: 14px;
}

/* Hero */
.hero {
  padding: 80px 0;
  background: linear-gradient(135deg, #f7f5f5 0%, #ebe9e9 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero h1 {
  margin-bottom: 20px;
}
.eyebrow {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
  font-weight: 500;
}
.lede {
  font-size: 19px;
  color: var(--ink-soft);
  margin-bottom: 32px;
  margin-top: revert;
}
.btn-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--paper);
  padding: 14px 28px;
  border-radius: 4px;
  font-weight: 500;
  font-size: 16px;
  border: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
  text-decoration: none;
}
.btn:hover {
  background: var(--accent-hover);
  color: var(--paper);
  transform: translateY(-1px);
}
.btn.ghost {
  background: transparent;
  border: 1px solid var(--ink-soft);
  color: var(--ink-soft);
}
.btn.ghost:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.dim-card {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: 6px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.dim-card .row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--paper-line);
}
.dim-card .row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.dim-card .row span {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}
.dim-card .row b {
  font-weight: 500;
  color: var(--ink);
  font-size: 15px;
  text-align: right;
}

/* Tools Strip */
.tools {
  background: var(--paper);
  border-top: 1px solid var(--paper-line);
  border-bottom: 1px solid var(--paper-line);
  padding: 20px 0;
}
.tools .wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.tools .label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-dim);
}
.chip {
  display: inline-block;
  background: var(--paper-fill);
  border: 1px solid var(--paper-line);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 14px;
  color: var(--ink-soft);
  font-weight: 500;
}

/* Section */
section {
  padding: 80px 0;
}
section.tight {
  padding: 60px 0;
}
.section-head {
  text-align: center;
  margin-bottom: 48px;
}
.section-head h2 {
  margin-top: 8px;
  margin-bottom: 16px;
}
.section-head p {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 700px;
  margin: 0 auto;
}

/* Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.card {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: 6px;
  padding: 28px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}
.card .tag {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: rgba(209, 67, 67, 0.08);
  padding: 4px 10px;
  border-radius: 3px;
  margin-bottom: 12px;
}
.card h3 {
  margin-bottom: 12px;
  font-size: 1.4rem;
}
.card p {
  color: var(--ink-soft);
  font-size: 15px;
  margin-bottom: 16px;
}
.card .more {
  color: var(--accent);
  font-weight: 500;
  font-size: 14px;
}
.card .more:hover {
  text-decoration: underline;
}

/* Titleblock */
.titleblock {
  background: var(--paper-fill);
  border-top: 1px solid var(--paper-line);
  border-bottom: 1px solid var(--paper-line);
  padding: 16px 0;
}
.titleblock .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.titleblock .crumb {
  font-size: 13px;
  color: var(--ink-dim);
}
.titleblock .crumb a {
  color: var(--ink-dim);
  text-decoration: none;
}
.titleblock .crumb a:hover {
  color: var(--accent);
}
.titleblock span {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  color: var(--ink-dim);
  letter-spacing: 0.04em;
}
.titleblock span b {
  color: var(--ink);
  font-weight: 500;
  margin-right: 4px;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}
.step {
  position: relative;
  padding-left: 40px;
}
.step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 24px;
  height: 24px;
  background: var(--accent);
  border-radius: 50%;
}
.step h3 {
  margin-bottom: 8px;
  font-size: 1.2rem;
}
.step p {
  color: var(--ink-soft);
  font-size: 15px;
}

/* Speclist */
.speclist {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px 32px;
}
.speclist li {
  padding-left: 28px;
  position: relative;
  font-size: 16px;
  color: var(--ink-soft);
}
.speclist li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* Chiplist */
.chiplist {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.chiplist a {
  background: var(--paper-fill);
  border: 1px solid var(--paper-line);
  padding: 10px 18px;
  border-radius: 4px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s;
}
.chiplist a:hover {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
}

/* Form Section */
.form-section {
  background: var(--paper-fill);
  padding: 80px 0;
}
.form-section form {
  max-width: 700px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field.full {
  grid-column: 1 / -1;
}
.field label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-dim);
}
.field input,
.field textarea {
  padding: 12px 16px;
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  font-family: inherit;
  font-size: 15px;
  background: var(--paper);
  transition: border-color 0.15s;
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--focus);
}
.field textarea {
  min-height: 120px;
  resize: vertical;
}

/* File Drop */
.file-drop {
  border: 2px dashed var(--paper-line);
  border-radius: 6px;
  padding: 40px 24px;
  text-align: center;
  color: var(--ink-dim);
  font-size: 14px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  position: relative;
}
.file-drop:hover,
.file-drop:focus,
.file-drop.dragover {
  border-color: var(--accent);
  background: rgba(209, 67, 67, 0.02);
  outline: none;
}
.file-drop input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
#file-list {
  list-style: none;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
#file-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--paper);
  border: 1px solid var(--paper-line);
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 13px;
}
#file-list button {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-weight: 500;
}
#file-list button:hover {
  text-decoration: underline;
}

/* Consent */
.consent {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 12px;
}
.consent input[type="checkbox"] {
  margin-top: 4px;
  cursor: pointer;
}
.consent label {
  cursor: pointer;
}

.submit-row {
  display: flex;
  align-items: center;
  gap: 16px;
}
#form-status {
  font-size: 14px;
  color: var(--ink-soft);
}
#form-status.success {
  color: #16a34a;
}
#form-status.error {
  color: var(--accent);
}

/* Contact Strip */
.contact-strip {
  background: var(--paper);
  border-top: 1px solid var(--paper-line);
  border-bottom: 1px solid var(--paper-line);
  padding: 40px 0;
}
.contact-strip .wrap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}
.contact-strip .label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  margin-bottom: 6px;
}
.contact-strip a {
  font-size: 16px;
  font-weight: 500;
  color: var(--accent);
}

/* Footer */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,0.7);
  padding: 32px 0;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.site-footer a {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  margin-left: 20px;
}
.site-footer a:hover {
  color: #fff;
}

/* Responsive */
@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  h1 { font-size: 2.6rem; }
  h2 { font-size: 2rem; }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--paper-line);
    flex-direction: column;
    align-items: stretch;
    padding: 20px 24px;
    gap: 16px;
  }
  .main-nav.open {
    display: flex;
  }
  .nav-toggle {
    display: block;
  }
  .header-cta {
    display: none;
  }
  #mobile-cta {
    display: block !important;
  }
  .form-section form {
    grid-template-columns: 1fr;
  }
  h1 { font-size: 2.2rem; }
}

/* Responsive */
@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  h1 { font-size: 2.6rem; }
  h2 { font-size: 2rem; }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--paper-line);
    flex-direction: column;
    align-items: stretch;
    padding: 20px 24px;
    gap: 16px;
  }
  .main-nav.open {
    display: flex;
  }
  .nav-toggle {
    display: block;
  }
  .header-cta {
    display: none;
  }
  #mobile-cta {
    display: block !important;
  }
  .form-section form {
    grid-template-columns: 1fr;
  }
  h1 { font-size: 2.2rem; }
}

/* Уважаем prefers-reduced-motion — убираем анимации для чувствительных пользователей */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Принудительный показ focus-outline для клавиатурной навигации */
:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 2px;
}