/* ============================================================
   АЭРОКОНТУР — style.css
   Tokens → Base → Layout → Components → Sections → Responsive
   ============================================================ */

/* ===== Tokens ===== */
:root {
  --ink:        #16202C;
  --navy:       #0E2A45;
  --navy-deep:  #0A2038;
  --cyan:       #DCEEF0;
  --cyan-dim:   rgba(220, 238, 240, .55);
  --paper:      #E8EAE4;
  --paper-steel:#DEE2DC;
  --orange:     #FF5A1F;
  --orange-lt:  #FF8A5C;
  --steel:      #8C97A1;
  --line:       rgba(22, 32, 44, .16);
  --line-cyan:  rgba(220, 238, 240, .22);
  --radius:     2px;
  --maxw:       1180px;

  --font-display: 'Big Shoulders Display', sans-serif;
  --font-body:    'IBM Plex Sans', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; }
html  { scroll-behavior: smooth; }
body  {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: .01em;
  text-transform: uppercase;
  line-height: 1.02;
}
p { margin: 0; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }
.mono { font-family: var(--font-mono); }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ===== Animations ===== */
.flow-line {
  stroke-dasharray: 5 9;
  animation: flow 1.8s linear infinite;
}
.flow-line--slow { animation-duration: 2.6s; }
@keyframes flow { to { stroke-dashoffset: -140; } }

.fan-blades {
  transform-origin: center;
  animation: spin 6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .flow-line, .fan-blades { animation: none !important; }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 14px 22px;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .15s ease, opacity .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary      { background: var(--orange); color: var(--ink); }
.btn--primary:hover{ background: var(--orange-lt); }
.btn--ghost-dark   { border-color: var(--line-cyan); color: var(--cyan); }
.btn--ghost-light  { border-color: var(--ink); color: var(--ink); }
.btn--block        { width: 100%; justify-content: center; }

/* ===== Titleblock (stamp) ===== */
.titleblock {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  border: 1px solid var(--line-cyan);
  min-width: 180px;
}
.titleblock--dark  { background: var(--navy-deep); color: var(--cyan); }
.titleblock--light { border-color: var(--line); }
.titleblock__row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 6px 10px;
  border-top: 1px solid var(--line-cyan);
}
.titleblock--light .titleblock__row { border-top-color: var(--line); }
.titleblock__row:first-child { border-top: none; }
.titleblock__label { color: var(--cyan-dim); }
.titleblock--light .titleblock__label { color: var(--steel); }

/* ===== Section base ===== */
.section        { padding: 88px 0; position: relative; }
.section--dark  { background: var(--navy); color: var(--cyan); }
.section--paper { background: var(--paper); }
.section--steel { background: var(--paper-steel); }

.section__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 14px;
}
.section--dark .eyebrow { color: var(--orange-lt); }

h2.section-title { font-size: clamp(1.9rem, 3.6vw, 2.7rem); max-width: 640px; }
.section-sub { max-width: 480px; color: var(--steel); font-size: .98rem; }
.section--dark .section-sub { color: var(--cyan-dim); }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  gap: 24px;
}
.logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  text-transform: uppercase;
  flex-shrink: 0;
}
.logo span { color: var(--orange); }

.nav-links {
  display: flex;
  gap: 28px;
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.nav-links a {
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: border-color .15s;
}
.nav-links a:hover { border-bottom-color: var(--orange); }

.header-right { display: flex; align-items: center; gap: 18px; }
.header-phone { font-family: var(--font-mono); font-weight: 600; font-size: .95rem; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: 1px solid var(--ink);
  cursor: pointer;
  border-radius: var(--radius);
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: transform .2s, opacity .2s;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  background: radial-gradient(ellipse at 20% 0%, #143657 0%, var(--navy) 55%, var(--navy-deep) 100%);
  color: var(--cyan);
  padding: 64px 0 0;
  overflow: hidden;
  position: relative;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-cyan) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-cyan) 1px, transparent 1px);
  background-size: 42px 42px;
  opacity: .18;
  pointer-events: none;
}
.hero__inner  { position: relative; z-index: 2; }
.hero__grid   { display: grid; grid-template-columns: 1.05fr .95fr; gap: 40px; align-items: center; }
.hero h1      { font-size: clamp(2.3rem, 4.6vw, 3.6rem); color: #fff; margin: 18px 0 22px; max-width: 560px; }
p.lede        { font-size: 1.06rem; color: var(--cyan-dim); max-width: 480px; margin-bottom: 32px; }
.hero__ctas   { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 46px; }

.hero__diagram { position: relative; }
.hero__diagram .titleblock { position: absolute; right: 0; bottom: -26px; }
.duct-svg { width: 100%; }
.svg-label { font-family: var(--font-mono); }

.dimline {
  display: flex;
  align-items: center;
  gap: 10px 28px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--cyan-dim);
  border-top: 1px solid var(--line-cyan);
  padding: 18px 0 54px;
}
.dimline b { color: #fff; font-weight: 600; }
.dimline .sep { color: var(--cyan-dim); }

/* ============================================================
   PAINS
   ============================================================ */
.pains-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.pain-card { background: var(--paper); padding: 30px 26px; }
.pain-card .num { display: block; font-family: var(--font-mono); color: var(--orange); font-size: .85rem; margin-bottom: 14px; }
.pain-card h3 { font-size: 1.05rem; font-family: var(--font-body); font-weight: 700; text-transform: none; letter-spacing: 0; margin-bottom: 10px; }
.pain-card p  { color: var(--steel); font-size: .92rem; }

/* ============================================================
   SERVICES — spec table
   ============================================================ */
.spec-table { border-top: 1px solid var(--line); }
.spec-row {
  display: grid;
  grid-template-columns: 90px 1.1fr 1.6fr;
  gap: 28px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.spec-row .id { font-family: var(--font-mono); color: var(--orange); font-size: 1.1rem; }
.spec-row h3  { font-size: 1.15rem; font-family: var(--font-body); font-weight: 700; text-transform: none; letter-spacing: 0; }
.spec-row p   { color: var(--steel); font-size: .94rem; }

/* ============================================================
   INDUSTRIES
   ============================================================ */
.industry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.industry-card {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.industry-card svg { width: 38px; height: 38px; }
.industry-card h3  { font-size: 1.02rem; font-family: var(--font-body); font-weight: 700; text-transform: none; letter-spacing: 0; }
.industry-card p   { color: var(--steel); font-size: .9rem; }

/* ============================================================
   PROCESS
   ============================================================ */
.process-track { margin-bottom: 40px; overflow: hidden; }
.process-track svg { width: 100%; height: 60px; }

.process-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px 24px; }
.process-card { border-top: 2px solid var(--orange); padding-top: 16px; }
.process-card .num { display: block; font-family: var(--font-mono); color: var(--orange); font-size: 1.3rem; margin-bottom: 8px; }
.process-card h3   { font-size: 1rem; font-family: var(--font-body); font-weight: 700; text-transform: none; letter-spacing: 0; color: #fff; margin-bottom: 8px; }
.process-card p    { color: var(--cyan-dim); font-size: .9rem; }

/* ============================================================
   TRUST
   ============================================================ */
.trust-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}
.trust-badge {
  border: 1px solid var(--line);
  padding: 24px 18px;
  text-align: center;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.trust-badge svg { width: 38px; height: 38px; }
.trust-badge p   { font-size: .84rem; color: var(--ink); font-weight: 500; }

/* ============================================================
   CONTACT FORM
   ============================================================ */
.form-section { background: var(--navy-deep); color: var(--cyan); }
.form-grid    { display: grid; grid-template-columns: .9fr 1.1fr; gap: 60px; align-items: start; }
.form-grid h2 { color: #fff; }
.form-info .lede { color: var(--cyan-dim); margin-top: 18px; }
.form-note { margin-top: 22px; font-size: .86rem; color: var(--cyan-dim); }

.form-box {
  background: var(--navy);
  border: 1px solid var(--line-cyan);
  padding: 32px;
}
.field { margin-bottom: 18px; display: flex; flex-direction: column; gap: 8px; }
.field label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--cyan-dim);
}
.field .req { color: var(--orange-lt); }
.field input, .field select, .field textarea {
  background: var(--navy-deep);
  border: 1px solid var(--line-cyan);
  color: #fff;
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: .95rem;
  border-radius: var(--radius);
  transition: border-color .15s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--orange-lt);
}
.field input::placeholder, .field textarea::placeholder { color: var(--steel); }
.field input.is-invalid { border-color: #e05555; }
.field-error { display: none; font-size: .8rem; color: #e07070; font-family: var(--font-mono); }
.field-error.is-visible { display: block; }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { background: var(--ink); color: var(--cyan-dim); padding: 48px 0 28px; }
.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(220, 238, 240, .15);
  padding-bottom: 32px;
  margin-bottom: 24px;
}
.footer-brand .logo { color: #fff; }
.footer-brand p { margin-top: 10px; max-width: 220px; font-size: .86rem; }
.footer-col { font-size: .86rem; }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: .74rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--steel);
  margin: 0 0 10px;
}
.footer-col p + p { margin-top: 6px; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  font-size: .78rem;
  font-family: var(--font-mono);
  color: var(--steel);
  flex-wrap: wrap;
  gap: 10px;
}

/* ============================================================
   MOBILE STICKY CTA
   ============================================================ */
.mobile-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: var(--navy-deep);
  border-top: 1px solid var(--line-cyan);
  padding: 12px 16px;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.mobile-cta .phone { color: #fff; font-family: var(--font-mono); font-weight: 600; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 980px) {
  .hero__grid    { grid-template-columns: 1fr; }
  .pains-grid    { grid-template-columns: repeat(2, 1fr); }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid  { grid-template-columns: repeat(2, 1fr); }
  .trust-grid    { grid-template-columns: repeat(3, 1fr); }
  .form-grid     { grid-template-columns: 1fr; }
  .spec-row      { grid-template-columns: 60px 1fr; }
  .spec-row p    { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
  .section { padding: 60px 0; }
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--paper);
    flex-direction: column;
    gap: 0;
    border-top: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height .25s ease;
  }
  .nav-links.is-open { max-height: 360px; }
  .nav-links a { padding: 14px 28px; border-bottom: 1px solid var(--line); }
  .nav-toggle  { display: flex; }
  .header-phone { display: none; }

  .pains-grid    { grid-template-columns: 1fr; }
  .industry-grid { grid-template-columns: 1fr; }
  .process-grid  { grid-template-columns: 1fr; }
  .trust-grid    { grid-template-columns: repeat(2, 1fr); }
  .field-row     { grid-template-columns: 1fr; }

  .hero__ctas .btn { flex: 1 1 100%; justify-content: center; }

  .mobile-cta { display: flex; }
  body { padding-bottom: 64px; }
}

/* ============================================================
   PROJECTS
   ============================================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.project-card {
  background: var(--paper);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.project-card__diagram {
  background: var(--navy);
  overflow: hidden;
  line-height: 0;
}
.project-card__diagram svg {
  width: 100%;
  height: auto;
  display: block;
}
.project-card__body {
  padding: 22px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}
.project-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.project-tag {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--orange);
  border: 1px solid var(--orange);
  padding: 3px 8px;
  border-radius: var(--radius);
}
.project-area {
  font-size: .82rem;
  color: var(--steel);
}
.project-card h3 {
  font-size: 1rem;
  font-family: var(--font-body);
  font-weight: 700;
  text-transform: none;
  letter-spacing: 0;
  line-height: 1.3;
}
.project-card p {
  font-size: .88rem;
  color: var(--steel);
  line-height: 1.5;
}
.project-specs {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  margin-top: auto;
}
.project-specs li {
  font-size: .82rem;
  color: var(--ink);
}
.project-specs .mono {
  color: var(--orange);
}

@media (max-width: 980px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 680px) {
  .projects-grid { grid-template-columns: 1fr; }
}