/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #1a365d;
  --color-primary-dark: #0f2744;
  --color-accent: #e67e22;
  --color-accent-hover: #d35400;
  --color-bg: #f7f9fc;
  --color-white: #ffffff;
  --color-text: #2d3748;
  --color-text-light: #718096;
  --color-border: #e2e8f0;
  --font-main: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius: 10px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  line-height: 1.6;
  background: var(--color-white);
  overflow-x: hidden;
}

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

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

.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 8px rgba(0,0,0,0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  position: relative;
  gap: 12px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  min-width: 0;
}

.logo-img {
  height: 32px;
  width: auto;
  display: block;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 0.3px;
  white-space: nowrap;
}

.nav {
  display: flex;
  gap: 22px;
  flex-wrap: nowrap;
}

.nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text);
  transition: color 0.2s;
  white-space: nowrap;
}

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

.header-phone {
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.92rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: transform 0.25s, opacity 0.25s;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: 80px 0 90px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.55rem, 4.5vw, 3rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero h1 span {
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2.5vw, 1.15rem);
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 28px;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.25s;
  border: 2px solid transparent;
  cursor: pointer;
}

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

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

.btn-outline {
  background: transparent;
  border-color: rgba(255,255,255,0.6);
  color: white;
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: white;
}

.btn-outline-dark {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn-outline-dark:hover {
  background: var(--color-primary);
  color: white;
}

/* ===== Sections ===== */
.section {
  padding: 64px 0;
}

.section-title {
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 12px;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 40px;
  font-size: clamp(0.95rem, 2.2vw, 1.1rem);
  padding: 0 8px;
}

.section-title-with-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.section-title-with-logo img {
  height: 40px;
  width: auto;
  max-width: min(220px, 70vw);
}

.section-title-with-logo img.blank {
  height: 34px;
  background: #2a2a2a;
  padding: 6px 12px;
  border-radius: 6px;
}

/* ===== About ===== */
.about {
  background: var(--color-bg);
}

.about-text p {
  margin-bottom: 18px;
  font-size: 1.05rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.about-vectors {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.vector {
  background: white;
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.vector h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.vector ul {
  margin: 12px 0 0;
  padding-left: 18px;
}

.vector li {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 8px;
}

/* ===== Partners ===== */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.partner-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 22px;
  box-shadow: var(--shadow);
  text-align: center;
}

.partner-logo {
  height: 52px;
  width: auto;
  max-width: 100%;
  margin: 0 auto 16px;
  object-fit: contain;
}

.partner-card h3 {
  color: var(--color-primary);
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.partner-card .partner-city {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.partner-card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.partner-brands {
  margin-top: 12px;
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.partner-brands img {
  height: 26px;
  width: auto;
  max-width: 140px;
}

.partner-brands img.blank-sm {
  height: 22px;
  background: #2a2a2a;
  padding: 4px 8px;
  border-radius: 4px;
}

/* ===== Brand logos strip ===== */
.brand-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  justify-content: center;
  align-items: center;
  margin: 20px 0 8px;
}

.brand-logos img {
  height: 40px;
  width: auto;
  max-width: min(160px, 42vw);
  object-fit: contain;
}

.brand-logos img.blank {
  height: 32px;
  background: #2a2a2a;
  padding: 6px 12px;
  border-radius: 6px;
}

.hero .brand-logos {
  gap: 16px;
  margin: 8px 0 32px;
}

.hero .brand-logo-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 168px;
  height: 72px;
  background: #ffffff;
  border-radius: 12px;
  padding: 12px 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
  transition:
    transform 0.28s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.28s ease,
    border-color 0.28s ease;
  border: 2px solid transparent;
  cursor: default;
}

.hero .brand-logo-pill:hover {
  transform: translateY(-6px) scale(1.04);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
  border-color: var(--color-accent);
}

.hero .brand-logo-pill img {
  height: 40px;
  width: auto;
  max-width: 140px;
  max-height: 44px;
  object-fit: contain;
  background: transparent !important;
  padding: 0 !important;
  transition: transform 0.28s ease;
}

.hero .brand-logo-pill:hover img {
  transform: scale(1.06);
}

.hero .brand-logo-pill img.blank {
  height: 32px;
  background: #2a2a2a !important;
  padding: 6px 12px !important;
  border-radius: 4px;
  max-width: 130px;
}

/* ===== Products ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.product-card {
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.25s, box-shadow 0.25s;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.product-image {
  height: 140px;
  background: linear-gradient(135deg, #2c5282, #1a365d);
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-placeholder {
  font-size: 2.4rem;
  font-weight: 800;
  color: rgba(255,255,255,0.25);
  letter-spacing: 2px;
}

.product-image--brand {
  background: linear-gradient(135deg, #2c5282, #1a365d);
  padding: 28px 20px;
}

.product-image--brand.brand-effa {
  background: linear-gradient(135deg, #c05621, #9c4221);
}

.product-image--brand.brand-veksa {
  background: linear-gradient(135deg, #2b6cb0, #2c5282);
}

.product-image--brand img {
  max-height: 72px;
  width: auto;
  max-width: 90%;
  object-fit: contain;
  margin: 0 auto;
}

.product-image--brand img.blank-logo {
  max-height: 52px;
  background: #2a2a2a;
  padding: 10px 16px;
  border-radius: 8px;
}

.product-info {
  padding: 20px;
  flex-grow: 1;
}

.product-info h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.product-info p {
  font-size: 0.92rem;
  color: var(--color-text-light);
}

/* ===== Spec tables ===== */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 16px 0 28px;
}

.spec-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  margin: 0;
  font-size: 0.92rem;
}

.spec-table th,
.spec-table td {
  border: 1px solid var(--color-border);
  padding: 10px 12px;
  text-align: left;
}

.spec-table th {
  background: var(--color-bg);
  color: var(--color-primary);
  font-weight: 600;
}

.spec-table tr:nth-child(even) {
  background: #fafbfc;
}

/* ===== Docs block ===== */
.docs-block {
  margin: 28px 0;
  padding: 22px;
  background: var(--color-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.docs-block h2 {
  margin-top: 0 !important;
  margin-bottom: 14px;
}

.docs-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.doc-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.doc-btn:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow);
  color: var(--color-accent);
}

/* ===== Calc form ===== */
.calc-block {
  margin: 32px 0;
  padding: 24px;
  background: white;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius);
}

.calc-block h2 {
  margin-top: 0 !important;
  color: var(--color-primary);
}

.calc-block .calc-note {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 18px;
}

.calc-form label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.calc-form .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.calc-form input,
.calc-form select,
.calc-form textarea {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 1rem;
}

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

.calc-form button {
  width: 100%;
  margin-top: 4px;
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  background: white;
  overflow: hidden;
}

.faq-item summary {
  padding: 14px 16px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item .faq-answer {
  padding: 0 16px 14px;
  color: var(--color-text-light);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ===== Advantages ===== */
.advantages {
  background: var(--color-bg);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
}

.advantage-card {
  background: white;
  padding: 24px 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: transform 0.2s;
}

.advantage-card:hover {
  transform: translateY(-3px);
}

.advantage-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.advantage-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.advantage-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* ===== Contacts ===== */
.contacts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-item {
  margin-bottom: 20px;
}

.contact-item strong {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.contact-item p,
.contact-item a {
  font-size: 1rem;
}

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

.contact-form-wrapper {
  background: var(--color-bg);
  padding: 28px 22px;
  border-radius: var(--radius);
}

.contact-form h3 {
  margin-bottom: 16px;
  color: var(--color-primary);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 1rem;
}

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

.contact-form button {
  width: 100%;
  margin-top: 6px;
}

.form-note {
  font-size: 0.78rem;
  color: var(--color-text-light);
  margin-top: 10px;
  text-align: center;
}

/* ===== Footer (unified) ===== */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.8);
  padding: 40px 0 36px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 28px 32px;
  align-items: start;
}

.footer .logo,
.footer .footer-logo {
  color: white;
  margin-bottom: 10px;
}

.footer .logo-text {
  color: white;
}

.footer-left p {
  font-size: 0.88rem;
  margin-bottom: 8px;
  line-height: 1.5;
}

.footer-contacts a {
  color: rgba(255,255,255,0.95);
  font-weight: 600;
  transition: color 0.2s;
}

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

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

.footer-nav a {
  color: rgba(255,255,255,0.85);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.footer-right p {
  font-size: 0.88rem;
  margin-bottom: 6px;
}

.footer-address {
  opacity: 0.75;
  font-size: 0.85rem !important;
}

/* ===== Product page ===== */
.product-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  padding: 48px 0 40px;
}

.product-hero h1 {
  font-size: clamp(1.4rem, 3.5vw, 2.1rem);
  margin-bottom: 10px;
  line-height: 1.25;
}

.product-hero .breadcrumb {
  font-size: 0.85rem;
  opacity: 0.75;
  margin-bottom: 12px;
}

.product-hero .breadcrumb a {
  color: white;
  text-decoration: underline;
}

.product-content {
  padding: 40px 0;
}

.product-content h2 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin: 28px 0 12px;
}

.product-content h2:first-child {
  margin-top: 0;
}

.product-content ul {
  padding-left: 18px;
  margin-bottom: 16px;
}

.product-content li {
  margin-bottom: 6px;
}

.product-content p {
  margin-bottom: 14px;
}

.back-link {
  display: inline-block;
  margin-top: 28px;
  color: var(--color-primary);
  font-weight: 600;
}

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

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .nav {
    gap: 14px;
  }
  .nav a {
    font-size: 0.85rem;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    padding: 8px 0;
    z-index: 99;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 14px 20px;
    border-bottom: 1px solid var(--color-border);
    font-size: 1rem;
  }

  .nav a:last-child {
    border-bottom: none;
  }

  .header-phone {
    font-size: 0.82rem;
    margin-right: 4px;
  }

  .calc-form .form-row {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 56px 0 64px;
  }

  .section {
    padding: 48px 0;
  }

  .contacts-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-nav {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px 18px;
  }

  .footer .logo,
  .footer .footer-logo {
    justify-content: center;
  }

  .logo-text {
    font-size: 0.95rem;
  }

  .logo-img {
    height: 28px;
  }

  .brand-logos img {
    height: 34px;
  }

  .brand-logos img.blank {
    height: 28px;
  }

  .hero .brand-logo-pill {
    width: 140px;
    height: 60px;
    padding: 10px 12px;
  }

  .hero .brand-logo-pill img {
    height: 34px;
    max-width: 112px;
  }

  .hero .brand-logo-pill img.blank {
    height: 28px;
  }

  .section-title-with-logo img {
    height: 34px;
  }

  .product-hero {
    padding: 36px 0 32px;
  }

  .docs-block,
  .calc-block {
    padding: 18px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 14px;
  }

  .header-inner {
    height: 58px;
  }

  .nav {
    top: 58px;
  }

  .header-phone {
    display: none;
  }

  .logo-text {
    font-size: 0.88rem;
  }

  .logo-img {
    height: 26px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-buttons .btn {
    width: 100%;
    text-align: center;
  }

  .brand-logos {
    gap: 10px;
  }

  .hero .brand-logos {
    gap: 10px;
  }

  .hero .brand-logo-pill {
    width: 110px;
    height: 52px;
    padding: 8px 10px;
  }

  .hero .brand-logo-pill img {
    height: 28px;
    max-width: 90px;
  }

  .hero .brand-logo-pill img.blank {
    height: 24px;
    padding: 4px 8px !important;
  }

  .docs-grid {
    flex-direction: column;
  }

  .doc-btn {
    justify-content: center;
  }

  .products-grid {
    grid-template-columns: 1fr;
  }

  .partners-grid,
  .advantages-grid,
  .about-vectors {
    grid-template-columns: 1fr;
  }
}