/* ============================================================
   NANO-Z-COATING CA — Light industrial redesign
   Языковая система: печатный лист. Бумага, краска, CMYK-шкалы,
   карточки-выкраски (ink chips), моно-подписи как на паспортах
   качества.
   ============================================================ */

:root {
  /* Paper & ink */
  --paper: #fbfbf9;
  --paper-tint: #f2f2ee;
  --ink: #17181c;
  --ink-soft: #55575f;
  --rule: #e0e0da;
  --rule-strong: #c9c9c2;

  /* Process colors */
  --cyan: #009fda;
  --cyan-dark: #007cad;
  --magenta: #d6006d;
  --yellow: #f2c500;
  --key: #17181c;
  --green: #00915a;
  --violet: #5b4b9e;

  /* Type */
  --font-display: "Archivo", "Arial Narrow", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "Consolas", monospace;

  --container: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ CMYK registration strip ============ */
.cmyk-strip {
  display: flex;
  height: 6px;
  width: 100%;
}
.cmyk-strip span { flex: 1; }
.cmyk-strip__c { background: var(--cyan); }
.cmyk-strip__m { background: var(--magenta); }
.cmyk-strip__y { background: var(--yellow); }
.cmyk-strip__k { background: var(--key); }

/* ============ Typography helpers ============ */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 20px;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  margin: 0 0 18px;
}

.section-subtitle {
  max-width: 620px;
  color: var(--ink-soft);
  margin: 0;
}

.section-head { margin-bottom: 56px; }

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid var(--ink);
  border-radius: 0;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn--primary {
  background: var(--ink);
  color: var(--paper);
}
.btn--primary:hover { background: var(--cyan); border-color: var(--cyan); color: #fff; }

.btn--outline {
  background: transparent;
  color: var(--ink);
}
.btn--outline:hover { background: var(--ink); color: var(--paper); }

.btn--inverse {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}
.btn--inverse:hover { background: var(--cyan); border-color: var(--cyan); color: #fff; }

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(255, 255, 255, 0.4);
}
.btn--ghost:hover { border-color: var(--paper); }

.btn--large { padding: 16px 30px; font-size: 0.85rem; }
.btn--full { width: 100%; }

.btn.is-sent {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

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

/* ============ Header ============ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  transition: box-shadow 0.25s ease;
}
.header--scrolled { box-shadow: 0 1px 0 var(--rule-strong), 0 8px 24px rgba(23, 24, 28, 0.06); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}

.logo-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--cyan);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.02em;
}
.logo-text sup {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.55em;
  color: var(--cyan-dark);
  margin-left: 3px;
}

.nav { display: flex; align-items: center; gap: 36px; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 28px;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.nav-link:hover { color: var(--ink); border-bottom-color: var(--cyan); }

.nav-actions { display: flex; align-items: center; gap: 20px; }

.nav-phone {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink);
  text-decoration: none;
}
.nav-phone:hover { color: var(--cyan-dark); }

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}
.mobile-toggle span {
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.mobile-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.mobile-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Hero ============ */
.hero {
  border-bottom: 1px solid var(--rule);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 48px;
  align-items: center;
  padding-top: 88px;
  padding-bottom: 88px;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 6.5vw, 4.8rem);
  line-height: 0.98;
  letter-spacing: -0.015em;
  text-transform: uppercase;
  margin: 0 0 28px;
}

.hero-title__accent { color: var(--cyan); }

.hero-description {
  max-width: 520px;
  color: var(--ink-soft);
  font-size: 1.05rem;
  margin: 0 0 36px;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* Swatch fan — фирменный элемент: веер выкрасок */
.swatch-fan {
  position: relative;
  height: 420px;
}

.swatch {
  position: absolute;
  width: 190px;
  height: 260px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  color: #fff;
  box-shadow: 0 12px 32px rgba(23, 24, 28, 0.18);
  transform-origin: bottom left;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}
.swatch::after {
  /* отверстие как у веера Pantone */
  content: "";
  position: absolute;
  top: 12px;
  left: 14px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  opacity: 0.85;
}

.swatch--c { background: var(--cyan); left: 6%; bottom: 40px; transform: rotate(-14deg); z-index: 1; }
.swatch--m { background: var(--magenta); left: 24%; bottom: 48px; transform: rotate(-4deg); z-index: 2; }
.swatch--y { background: var(--yellow); color: var(--ink); left: 42%; bottom: 52px; transform: rotate(6deg); z-index: 3; }
.swatch--k { background: var(--key); left: 60%; bottom: 50px; transform: rotate(16deg); z-index: 4; }

.swatch-fan:hover .swatch--c { transform: rotate(-22deg) translateY(-8px); }
.swatch-fan:hover .swatch--m { transform: rotate(-8deg) translateY(-14px); }
.swatch-fan:hover .swatch--y { transform: rotate(10deg) translateY(-14px); }
.swatch-fan:hover .swatch--k { transform: rotate(24deg) translateY(-8px); }

.swatch-code {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  opacity: 0.85;
}

.swatch-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.02em;
}

/* Hero stats — линейка вдоль нижней кромки */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--rule);
}

.hero-stat {
  padding: 28px 24px 32px 0;
}
.hero-stat + .hero-stat { border-left: 1px solid var(--rule); padding-left: 24px; }

.hero-stat-value {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2.1rem;
  line-height: 1;
  margin-bottom: 8px;
}

.hero-stat-label {
  font-size: 0.82rem;
  color: var(--ink-soft);
  max-width: 220px;
}

/* ============ Sections ============ */
.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--rule);
}

.section--tinted { background: var(--paper-tint); }

/* ============ Features: ruled grid ============ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--rule-strong);
  border-left: 1px solid var(--rule-strong);
}

.feature-cell {
  padding: 28px 24px 34px;
  border-right: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  transition: background 0.2s ease;
}
.feature-cell:hover { background: var(--paper-tint); }

.feature-index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--cyan-dark);
  letter-spacing: 0.12em;
}

.feature-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  margin: 14px 0 10px;
}

.feature-desc {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 0;
}

.feature-cell--cta {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: 16px;
  background: var(--ink);
}
.feature-cell--cta:hover { background: var(--ink); }

.feature-cta-text {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--paper);
  font-size: 1.05rem;
  margin: 0;
}
.feature-cell--cta .btn--outline { color: var(--paper); border-color: rgba(255,255,255,0.5); }
.feature-cell--cta .btn--outline:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }

/* ============ Category tabs ============ */
.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-bottom: 48px;
  border: 1px solid var(--rule-strong);
  background: var(--paper);
  width: fit-content;
  max-width: 100%;
}

.category-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: transparent;
  color: var(--ink-soft);
  border: none;
  border-right: 1px solid var(--rule);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.category-tab:last-child { border-right: none; }
.category-tab:hover { color: var(--ink); background: var(--paper-tint); }
.category-tab--active { background: var(--ink); color: var(--paper); }
.category-tab--active:hover { background: var(--ink); color: var(--paper); }

.tab-dot {
  width: 9px;
  height: 9px;
  display: inline-block;
}
.tab-dot--inks { background: var(--cyan); }
.tab-dot--deposit { background: var(--magenta); }
.tab-dot--deaerators { background: var(--yellow); }
.tab-dot--coatings { background: var(--key); }
.category-tab--active .tab-dot--coatings { background: var(--paper); }
.tab-dot--retention { background: var(--green); }
.tab-dot--brighteners { background: var(--violet); }

/* ============ Product chips (Pantone-style) ============ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.chip {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--rule-strong);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.chip:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(23, 24, 28, 0.12);
}

.chip-swatch {
  position: relative;
  height: 116px;
  padding: 14px 16px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  color: #fff;
}
.chip-swatch--inks { background: var(--cyan); }
.chip-swatch--deposit { background: var(--magenta); }
.chip-swatch--deaerators { background: var(--yellow); color: var(--ink); }
.chip-swatch--coatings { background: var(--key); }
.chip-swatch--retention { background: var(--green); }
.chip-swatch--brighteners { background: var(--violet); }

.chip-formula {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.chip-badge {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.22);
}
.chip-swatch--deaerators .chip-badge { background: rgba(23, 24, 28, 0.12); }

.chip-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 20px;
}

.chip-cat {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.chip-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.25;
  margin: 0 0 10px;
}

.chip-desc {
  font-size: 0.86rem;
  color: var(--ink-soft);
  margin: 0 0 18px;
  flex: 1;
}

.chip-specs {
  margin: 0 0 18px;
  border-top: 1px solid var(--rule);
}
.chip-spec {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.8rem;
}
.chip-spec dt { color: var(--ink-soft); margin: 0; }
.chip-spec dd { margin: 0; font-family: var(--font-mono); font-size: 0.76rem; text-align: right; }

.chip-actions { display: flex; gap: 10px; }
.chip-actions .btn { flex: 1; padding: 10px 12px; font-size: 0.72rem; }

/* ============ Advantages ============ */
.advantages-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: start;
}

.advantage-list { margin-top: 40px; }

.advantage-item {
  display: flex;
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid var(--rule);
}

.advantage-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan-dark);
  padding-top: 4px;
}

.advantage-content h4 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  margin: 0 0 8px;
}
.advantage-content p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0;
}

/* Stats panel — таблица паспорта качества */
.stats-panel {
  border: 1px solid var(--rule-strong);
  background: #fff;
}

.stats-panel-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0;
  padding: 16px 20px;
  background: var(--ink);
  color: var(--paper);
}

.stats-table {
  width: 100%;
  border-collapse: collapse;
}
.stats-table td {
  padding: 20px;
  border-bottom: 1px solid var(--rule);
  vertical-align: middle;
}
.stats-table tr:last-child td { border-bottom: none; }

.stats-key { font-size: 0.88rem; color: var(--ink-soft); }

.stats-val {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.9rem;
  text-align: right;
  white-space: nowrap;
  width: 1%;
}

/* ============ Ecology ============ */
.ecology-process {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding-top: 40px;
  margin-bottom: 56px;
}

.ecology-timeline-track {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--rule);
}

.ecology-timeline-fill {
  width: 0;
  height: 100%;
  background: var(--cyan);
  transition: width 0.2s linear, height 0.2s linear;
}

.process-step {
  opacity: 0.35;
  transition: opacity 0.4s ease;
}
.process-step--active { opacity: 1; }

.process-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan-dark);
  margin-bottom: 12px;
}

.process-content h4 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  margin: 0 0 8px;
}
.process-content p {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0;
}

.ecology-info-card {
  border: 1px solid var(--rule-strong);
  background: #fff;
  padding: 36px;
}

.ecology-statement {
  font-size: 0.92rem;
  color: var(--ink-soft);
  margin: 0 0 28px;
  max-width: 900px;
}

.ecology-callout {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}

.callout-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.callout-phone {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--ink);
  text-decoration: none;
}
.callout-phone:hover { color: var(--cyan-dark); }

/* ============ CTA — печатный «оборот» листа ============ */
.cta {
  background: var(--ink);
  color: var(--paper);
}

.cta-wrapper {
  padding-top: 96px;
  padding-bottom: 96px;
  text-align: center;
}

.cta-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  text-transform: uppercase;
  line-height: 1.05;
  margin: 0 0 18px;
}

.cta-desc {
  color: rgba(251, 251, 249, 0.65);
  max-width: 540px;
  margin: 0 auto 36px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 24px;
}

.cta-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(251, 251, 249, 0.45);
  margin: 0;
}

/* ============ Contact ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 64px;
  align-items: start;
}

.contact-item {
  padding: 20px 0;
  border-top: 1px solid var(--rule);
}
.contact-item:last-child { border-bottom: 1px solid var(--rule); }

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.contact-value { font-size: 0.95rem; }
.contact-value a { color: var(--ink); text-decoration: none; }
.contact-value a:hover { color: var(--cyan-dark); }

.contact-form {
  border: 1px solid var(--rule-strong);
  background: #fff;
  padding: 36px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group { margin-bottom: 20px; }

.form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: 0;
  transition: border-color 0.2s ease;
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--cyan);
}
.form-input::placeholder,
.form-textarea::placeholder { color: #9a9ca3; }

.form-textarea { min-height: 120px; resize: vertical; }

/* ============ Footer ============ */
.footer {
  background: var(--ink);
  color: rgba(251, 251, 249, 0.7);
  padding: 72px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

.logo--footer { color: var(--paper); }
.footer-brand p { font-size: 0.86rem; margin: 16px 0 0; max-width: 320px; }

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper);
  margin-bottom: 18px;
}

.footer-links { display: flex; flex-direction: column; gap: 10px; }

.footer-link {
  font-size: 0.86rem;
  color: rgba(251, 251, 249, 0.6);
  text-decoration: none;
}
.footer-link:hover { color: var(--paper); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-top: 28px;
  border-top: 1px solid rgba(251, 251, 249, 0.12);
}

.footer-copyright { font-size: 0.78rem; }

.footer-socials { display: flex; gap: 20px; }

.footer-social {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(251, 251, 249, 0.6);
  text-decoration: none;
}
.footer-social:hover { color: var(--paper); }

/* ============ Reveal animations ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .swatch { transition: none; }
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; padding-top: 64px; padding-bottom: 64px; }
  .hero-visual { display: flex; justify-content: center; }
  .swatch-fan { height: 340px; width: 100%; max-width: 560px; }
  .swatch { width: 160px; height: 220px; }

  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .advantages-grid { grid-template-columns: 1fr; gap: 48px; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .ecology-process { grid-template-columns: repeat(2, 1fr); }
  .ecology-timeline-track { display: none; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--rule-strong);
    padding: 8px 0;
  }
  .nav-links.is-open { display: flex; }
  .nav-links li { border-top: 1px solid var(--rule); }
  .nav-link { display: block; padding: 14px 24px; border-bottom: none; }

  .nav-actions { display: none; }
  .mobile-toggle { display: flex; }

  .hero-stats { grid-template-columns: 1fr 1fr; }
  .hero-stat { padding: 20px 16px 24px 0; }
  .hero-stat + .hero-stat { border-left: none; padding-left: 0; }
  .hero-stat:nth-child(even) { border-left: 1px solid var(--rule); padding-left: 16px; }
  .hero-stat:nth-child(n+3) { border-top: 1px solid var(--rule); }

  .swatch-fan { height: 300px; }
  .swatch { width: 132px; height: 184px; }
  .swatch--c { left: 0; }
  .swatch--m { left: 22%; }
  .swatch--y { left: 44%; }
  .swatch--k { left: 64%; }

  .features-grid { grid-template-columns: 1fr; }
  .products-grid { grid-template-columns: 1fr; }
  .ecology-process { grid-template-columns: 1fr; gap: 24px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .category-tabs { width: 100%; }
  .category-tab { flex: 1 1 auto; justify-content: center; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { width: 100%; }
  .cta-actions .btn { width: 100%; }
}