/* ============== RESET & BASE ============== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #FAFAFA;
  --white: #FFFFFF;
  --text: #1A1A1A;
  --text-soft: #5C5C5C;
  --text-muted: #8E8E8E;
  --border: #E5E5E5;
  --border-soft: #F0F0F0;
  --accent: #D9430D;
  --accent-hover: #B8370A;
  --accent-soft: #FDF1EC;
  --success: #2E8B57;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.08);
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 { font-size: 36px; }
h2 { font-size: 28px; }
h3 { font-size: 20px; }
h4 { font-size: 17px; }

p { color: var(--text-soft); }

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 64px 0;
}

.section-title {
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-soft);
  margin-bottom: 32px;
  max-width: 720px;
}

/* ============== BUTTONS ============== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: background 0.18s, color 0.18s, border-color 0.18s;
  white-space: nowrap;
}

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

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

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

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

.btn-light {
  background: var(--white);
  color: var(--text);
  border: 1px solid var(--border);
}

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

.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
}

.btn-block {
  width: 100%;
}

/* ============== HEADER ============== */
.header {
  position: sticky;
  top: 0;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.logo-mark {
  width: 32px;
  height: 32px;
  background: var(--text);
  color: var(--white);
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 16px;
}

.nav {
  display: flex;
  gap: 28px;
  margin-left: auto;
}

.nav a {
  font-size: 14px;
  color: var(--text-soft);
  transition: color 0.18s;
  position: relative;
  padding: 4px 0;
}

.nav a:hover {
  color: var(--text);
}

.nav a.active {
  color: var(--text);
  font-weight: 600;
}

.nav a.active::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang {
  display: flex;
  gap: 2px;
  background: var(--bg);
  padding: 3px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.lang button {
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--text-muted);
  transition: background 0.18s, color 0.18s;
}

.lang button.active {
  background: var(--text);
  color: var(--white);
}

.phone {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

.phone:hover {
  color: var(--accent);
}

.menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  align-items: center;
  justify-content: center;
}

/* ============== HERO ============== */
.hero {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 56px 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-lead {
  font-size: 17px;
  color: var(--text-soft);
  margin-bottom: 32px;
  max-width: 540px;
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-meta {
  display: flex;
  gap: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.hero-meta div {
  display: flex;
  flex-direction: column;
}

.hero-meta strong {
  font-size: 22px;
  font-weight: 800;
  line-height: 1.2;
}

.hero-meta span {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 2px;
}

.hero-image {
  aspect-ratio: 5/4;
  background: var(--bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

.hero-image svg {
  width: 100%;
  height: 100%;
}

/* ============== FEATURE STRIP ============== */
.features {
  background: var(--white);
  padding: 36px 0;
  border-bottom: 1px solid var(--border);
}

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

.feature {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.feature-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
}

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

.feature-text strong {
  font-size: 15px;
  font-weight: 700;
  display: block;
  margin-bottom: 2px;
}

.feature-text span {
  font-size: 13px;
  color: var(--text-soft);
  line-height: 1.45;
}

/* ============== MODEL CARDS GRID ============== */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.section-head .section-title {
  margin-bottom: 6px;
}

.section-head p {
  font-size: 15px;
  max-width: 520px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--text);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-image {
  aspect-ratio: 4/3;
  background: var(--bg);
  position: relative;
  overflow: hidden;
}

.card-image svg {
  width: 100%;
  height: 100%;
  display: block;
}

.card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--white);
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid var(--border);
}

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

.card-title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 4px;
}

.card-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.card-specs {
  display: flex;
  gap: 16px;
  margin-bottom: 18px;
  padding: 14px 0;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
}

.card-specs div {
  flex: 1;
}

.card-specs span {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}

.card-specs strong {
  font-size: 14px;
  font-weight: 700;
}

.card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.card-price {
  display: flex;
  flex-direction: column;
}

.card-price small {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.card-price strong {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}

.card-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.18s;
}

.card:hover .card-link {
  gap: 8px;
}

/* ============== MODEL DETAIL PAGE ============== */
.crumbs {
  padding: 16px 0;
  font-size: 13px;
  color: var(--text-muted);
}

.crumbs a {
  color: var(--text-soft);
}

.crumbs a:hover {
  color: var(--accent);
}

.crumbs span {
  margin: 0 6px;
  color: var(--border);
}

.product {
  padding: 16px 0 48px;
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 40px;
  align-items: start;
}

.product-gallery {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.product-gallery-main {
  aspect-ratio: 16/10;
  background: var(--bg);
}

.product-gallery-main svg {
  width: 100%;
  height: 100%;
}

.product-info {
  position: sticky;
  top: 88px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.product-info h1 {
  font-size: 28px;
  margin-bottom: 4px;
}

.product-info-tag {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.product-price {
  padding: 16px 0;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 20px;
}

.product-price small {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.product-price strong {
  display: block;
  font-size: 26px;
  font-weight: 800;
  line-height: 1.1;
}

.product-price em {
  font-style: normal;
  font-size: 13px;
  color: var(--text-soft);
  display: block;
  margin-top: 4px;
}

.product-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 24px;
}

.product-spec {
  padding: 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.product-spec span {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 2px;
}

.product-spec strong {
  font-size: 14px;
  font-weight: 700;
}

.product-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.product-actions .btn-block {
  padding: 14px;
}

.product-meta {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border-soft);
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Product sections (description, equipment, layouts) */
.product-section {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
}

.product-section h2 {
  font-size: 21px;
  margin-bottom: 16px;
}

.product-section p {
  font-size: 15px;
  line-height: 1.6;
  margin-bottom: 14px;
}

.product-section p:last-child {
  margin-bottom: 0;
}

/* Equipment table */
.equip-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.equip-table tr {
  border-bottom: 1px solid var(--border-soft);
}

.equip-table tr:last-child {
  border-bottom: none;
}

.equip-table td {
  padding: 12px 0;
  vertical-align: top;
}

.equip-table td:first-child {
  color: var(--text-muted);
  width: 40%;
  padding-right: 16px;
}

.equip-table td:last-child {
  color: var(--text);
  font-weight: 500;
}

/* Layouts grid in product */
.layouts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}

.layout-item {
  background: var(--bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 14px;
}

.layout-svg {
  aspect-ratio: 5/4;
  background: var(--white);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  overflow: hidden;
}

.layout-svg svg {
  width: 100%;
  height: 100%;
}

.layout-item strong {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 2px;
}

.layout-item span {
  font-size: 12px;
  color: var(--text-muted);
}

/* ============== PHOTO GALLERY (product page) ============== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.gallery-item {
  aspect-ratio: 4/3;
  background: var(--bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.gallery-placeholder {
  display: grid;
  place-items: center;
  background:
    linear-gradient(45deg, transparent 49%, var(--border) 49%, var(--border) 51%, transparent 51%),
    var(--bg);
  background-size: 20px 20px;
}

.gallery-placeholder span {
  background: var(--white);
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: 999px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--border);
}

@media (max-width: 720px) {
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============== HOW WE WORK (steps) ============== */
.steps {
  background: var(--white);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.step {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 15px;
}

.step strong {
  font-size: 16px;
  font-weight: 700;
}

.step p {
  font-size: 14px;
  color: var(--text-soft);
  line-height: 1.5;
}

/* ============== CALCULATOR ============== */
.calc-page .calc-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 32px;
  align-items: start;
}

.calc-options {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.calc-group {
  margin-bottom: 28px;
}

.calc-group:last-child {
  margin-bottom: 0;
}

.calc-group h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 14px;
}

.calc-models {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.calc-model {
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 10px;
  text-align: center;
  background: var(--white);
  transition: border-color 0.18s, background 0.18s;
}

.calc-model:hover {
  border-color: var(--text-soft);
}

.calc-model input {
  position: absolute;
  opacity: 0;
}

.calc-model strong {
  display: block;
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 2px;
}

.calc-model small {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
}

.calc-model.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.calc-model.selected strong {
  color: var(--accent);
}

.calc-extras {
  display: flex;
  flex-direction: column;
}

.calc-extra {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-soft);
  cursor: pointer;
}

.calc-extra:last-child {
  border-bottom: none;
}

.calc-extra-info {
  flex: 1;
}

.calc-extra-info strong {
  font-size: 14px;
  font-weight: 700;
  display: block;
  margin-bottom: 2px;
}

.calc-extra-info span {
  font-size: 12px;
  color: var(--text-muted);
}

.calc-extra-price {
  font-size: 13px;
  color: var(--text-soft);
  font-weight: 600;
  white-space: nowrap;
}

.toggle {
  width: 40px;
  height: 22px;
  background: var(--border);
  border-radius: 999px;
  position: relative;
  flex-shrink: 0;
  transition: background 0.2s;
}

.toggle::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--white);
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 2px rgba(0,0,0,0.15);
}

.toggle.on {
  background: var(--accent);
}

.toggle.on::after {
  transform: translateX(18px);
}

.calc-summary {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: sticky;
  top: 88px;
}

.calc-summary h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 8px;
}

.calc-total {
  font-size: 30px;
  font-weight: 800;
  margin-bottom: 4px;
  line-height: 1.1;
}

.calc-total-note {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.calc-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 16px 0;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  max-height: 280px;
  overflow-y: auto;
}

.calc-list li {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 4px 0;
  gap: 12px;
}

.calc-list li span:first-child {
  color: var(--text-soft);
  flex: 1;
}

.calc-list li span:last-child {
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
}

/* ============== CONTACTS PAGE ============== */
.contacts-page .container > h1 {
  margin: 16px 0 32px;
}

.contacts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.contacts-block {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.contacts-block h3 {
  font-size: 18px;
  margin-bottom: 18px;
}

.contact-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-soft);
}

.contact-row:last-child {
  border-bottom: none;
}

.contact-row span {
  font-size: 13px;
  color: var(--text-muted);
}

.contact-row strong {
  font-size: 14px;
  font-weight: 700;
}

.contact-row a:hover {
  color: var(--accent);
}

/* ============== FORM ============== */
.form .field {
  margin-bottom: 14px;
}

.form label {
  display: block;
  font-size: 13px;
  color: var(--text-soft);
  margin-bottom: 6px;
  font-weight: 600;
}

.form input,
.form select,
.form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14px;
  background: var(--white);
  color: var(--text);
  transition: border-color 0.18s;
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--text);
}

.form textarea {
  resize: vertical;
  min-height: 88px;
}

.form .btn-primary {
  margin-top: 6px;
}

.form-note {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 12px;
  line-height: 1.5;
}

.form-success {
  display: none;
  background: #E7F6EC;
  color: #1A6B3E;
  padding: 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-top: 12px;
  text-align: center;
}

.form-success.show {
  display: block;
}

/* ============== CONTACT CTA SECTION ============== */
.contact-cta {
  background: var(--white);
  border-top: 1px solid var(--border);
}

.contact-cta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-cta-info h2 {
  margin-bottom: 16px;
}

.contact-cta-info p {
  font-size: 16px;
  margin-bottom: 28px;
  max-width: 460px;
}

.contact-cta-list {
  list-style: none;
  border-top: 1px solid var(--border);
}

.contact-cta-list li {
  display: flex;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-soft);
}

.contact-cta-list li span:first-child {
  color: var(--text-muted);
  font-size: 13px;
}

.contact-cta-list li span:last-child {
  font-weight: 600;
}

.form-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.form-card h3 {
  margin-bottom: 18px;
}

/* ============== FOOTER ============== */
footer {
  background: #111;
  color: rgba(255,255,255,0.7);
  padding: 56px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-brand strong {
  display: block;
  color: var(--white);
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 10px;
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  max-width: 300px;
  line-height: 1.5;
}

.footer-col h5 {
  color: var(--white);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  font-weight: 700;
}

.footer-col a {
  display: block;
  padding: 5px 0;
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  transition: color 0.18s;
}

.footer-col a:hover {
  color: var(--white);
}

.footer-bottom {
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* ============== WHATSAPP FLOAT ============== */
.wa-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 52px;
  height: 52px;
  background: #25D366;
  border-radius: 50%;
  display: grid;
  place-items: center;
  z-index: 40;
  box-shadow: 0 8px 20px rgba(37,211,102,0.35);
  transition: transform 0.2s;
}

.wa-float:hover {
  transform: scale(1.08);
}

.wa-float svg {
  width: 26px;
  height: 26px;
  color: var(--white);
}

/* ============== RESPONSIVE ============== */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: 1fr; }
  .product-info { position: static; }
  .calc-page .calc-grid { grid-template-columns: 1fr; }
  .calc-summary { position: static; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-cta-grid { grid-template-columns: 1fr; }
  .contacts-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  h1 { font-size: 28px; }
  h2 { font-size: 24px; }
  .hero h1 { font-size: 32px; }
  .hero { padding: 36px 0; }
  .section { padding: 48px 0; }

  .nav { display: none; }
  .nav.open {
    display: flex;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 12px 24px 20px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
  }
  .nav.open a { padding: 10px 0; }

  .menu-btn { display: inline-flex; }
  .phone { display: none; }

  .features-grid { grid-template-columns: 1fr; gap: 20px; }
  .steps-grid { grid-template-columns: 1fr; gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 8px; }

  .calc-models { grid-template-columns: repeat(2, 1fr); }
  .hero-meta { flex-wrap: wrap; gap: 18px 28px; }
  .product-specs { grid-template-columns: 1fr 1fr; }
}