/* ============================================
   SOLIDARMOR 朔铠 - 丝网制品独立站
   Professional B2B Wire Mesh Export Website
   ============================================ */

/* === CSS Variables / Design Tokens === */
:root {
  /* Primary Colors - Industrial Blue-Gray */
  --color-primary: #1a3a5c;
  --color-primary-dark: #0f2440;
  --color-primary-light: #2a5a8c;
  --color-accent: #c9a227;
  --color-accent-light: #f5d77a;
  --color-accent-dark: #a07d1a;

  /* Neutrals */
  --color-white: #ffffff;
  --color-off-white: #f8f9fa;
  --color-light-gray: #e9ecef;
  --color-gray: #6c757d;
  --color-dark-gray: #343a40;
  --color-black: #1a1a1a;

  /* Functional */
  --color-success: #28a745;
  --color-danger: #dc3545;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.16);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.2);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --transition: all 0.3s ease;
  --font-heading: 'Arial Black', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-dark-gray);
  line-height: 1.7;
  background: var(--color-white);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

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

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.3;
  color: var(--color-black);
}

/* === Utility Classes === */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section--gray { background: var(--color-off-white); }
.section--dark { background: var(--color-primary-dark); color: var(--color-white); }
.section--primary { background: var(--color-primary); color: var(--color-white); }

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  text-align: center;
  margin-bottom: 12px;
  position: relative;
}

.section__subtitle {
  text-align: center;
  color: var(--color-gray);
  font-size: 1.05rem;
  max-width: 650px;
  margin: 0 auto 50px;
}

.section--dark .section__subtitle,
.section--primary .section__subtitle {
  color: rgba(255,255,255,0.7);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  letter-spacing: 0.3px;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-black);
  border-color: var(--color-accent);
}
.btn--primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn--dark {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.btn--dark:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* === Header / Navigation === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.header--scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header__logo img,
.header__logo svg {
  height: 48px;
  width: auto;
  min-width: 140px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__link {
  padding: 8px 16px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-dark-gray);
  border-radius: var(--radius-sm);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform 0.25s ease;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-primary);
}
.nav__link:hover::after,
.nav__link.active::after {
  transform: scaleX(1);
}

.nav__link--cta {
  background: var(--color-accent);
  color: var(--color-black) !important;
  font-weight: 700;
  padding: 10px 24px !important;
}
.nav__link--cta::after { display: none; }
.nav__link--cta:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}

/* Mobile menu toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}
.nav__toggle span {
  width: 26px;
  height: 2.5px;
  background: var(--color-dark-gray);
  border-radius: 2px;
  transition: var(--transition);
}

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 16px;
  padding-left: 16px;
  border-left: 1px solid var(--color-light-gray);
}

.lang-btn {
  padding: 4px 10px;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  background: none;
  color: var(--color-gray);
  transition: var(--transition);
}
.lang-btn.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}
.lang-btn:hover:not(.active) {
  border-color: var(--color-light-gray);
  color: var(--color-dark-gray);
}

/* === Hero Section === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, #1a4a6c 100%);
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(201,162,39,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.04) 0%, transparent 50%);
}

.hero__pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0.04;
  background-image:
    linear-gradient(var(--color-white) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-white) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero__content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero__text {
  color: var(--color-white);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(201,162,39,0.15);
  border: 1px solid rgba(201,162,39,0.3);
  color: var(--color-accent-light);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.hero__title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  color: var(--color-white);
  margin-bottom: 20px;
  line-height: 1.15;
}

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

.hero__desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.78);
  margin-bottom: 36px;
  max-width: 520px;
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero__stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.12);
}

.hero__stat-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--color-accent);
  font-family: var(--font-heading);
}

.hero__stat-label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  margin-top: 2px;
}

/* Hero Visual - Wire Mesh Pattern */
.hero__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__mesh-display {
  width: 420px;
  height: 420px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mesh-circle {
  position: absolute;
  border: 1px solid rgba(201,162,39,0.2);
  border-radius: 50%;
  animation: meshPulse 4s ease-in-out infinite;
}
.mesh-circle:nth-child(1) { width: 100%; height: 100%; animation-delay: 0s; }
.mesh-circle:nth-child(2) { width: 80%; height: 80%; animation-delay: 0.5s; }
.mesh-circle:nth-child(3) { width: 60%; height: 60%; animation-delay: 1s; }
.mesh-circle:nth-child(4) { width: 40%; height: 40%; animation-delay: 1.5s; }

@keyframes meshPulse {
  0%, 100% { opacity: 0.2; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.03); }
}

.hero__mesh-icon {
  width: 180px;
  height: 180px;
  position: relative;
  z-index: 2;
}

/* === Product Categories === */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.product-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--color-light-gray);
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

.product-card__image {
  height: 220px;
  background: linear-gradient(135deg, var(--color-off-white), var(--color-light-gray));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.product-card:hover .product-card__image img {
  transform: scale(1.08);
}

.product-card__image-icon {
  font-size: 64px;
  opacity: 0.15;
  color: var(--color-primary);
}

.product-card__badge {
  position: absolute;
  top: 14px;
  left: 14px;
  background: var(--color-accent);
  color: var(--color-black);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.product-card__body {
  padding: 24px;
}

.product-card__title {
  font-size: 1.2rem;
  margin-bottom: 8px;
  font-family: var(--font-body);
  font-weight: 700;
}

.product-card__desc {
  font-size: 0.9rem;
  color: var(--color-gray);
  margin-bottom: 16px;
  line-height: 1.6;
}

.product-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9rem;
}
.product-card__link:hover {
  color: var(--color-accent-dark);
  gap: 10px;
}

/* === Advantages Section === */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 30px;
}

.advantage-item {
  text-align: center;
  padding: 36px 24px;
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition);
}
.advantage-item:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-4px);
  border-color: rgba(201,162,39,0.3);
}

.advantage-item__icon {
  width: 68px;
  height: 68px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
}

.advantage-item__title {
  font-size: 1.1rem;
  color: var(--color-white);
  margin-bottom: 10px;
  font-family: var(--font-body);
  font-weight: 700;
}

.advantage-item__desc {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.6;
}

/* === Certifications === */
.cert-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 40px;
  align-items: center;
}

.cert-item {
  text-align: center;
  padding: 20px 30px;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  min-width: 160px;
  transition: var(--transition);
}
.cert-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.cert-item__icon {
  font-size: 42px;
  margin-bottom: 10px;
}
.cert-item__name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-dark-gray);
}

/* === CTA Banner === */
.cta-banner {
  background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent), var(--color-accent-light));
  border-radius: var(--radius-xl);
  padding: 60px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: rgba(255,255,255,0.08);
  border-radius: 50%;
}
.cta-banner__title {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  color: var(--color-black);
  margin-bottom: 14px;
  position: relative;
}
.cta-banner__desc {
  font-size: 1.05rem;
  color: rgba(0,0,0,0.65);
  margin-bottom: 30px;
  position: relative;
  max-width: 550px;
  margin-left: auto;
  margin-right: auto;
}

/* === About Page === */
.about-hero {
  padding: 140px 0 70px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-white);
  text-align: center;
}
.about-hero__title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--color-white);
  margin-bottom: 14px;
}
.about-hero__desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.72);
  max-width: 600px;
  margin: 0 auto;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-text h2 {
  font-size: 1.8rem;
  margin-bottom: 20px;
}
.about-text p {
  color: var(--color-gray);
  margin-bottom: 16px;
  line-height: 1.8;
}
.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-off-white), var(--color-light-gray));
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
  opacity: 0.3;
}

.timeline {
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-accent);
}
.timeline-item {
  position: relative;
  padding-bottom: 36px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-white);
  box-shadow: var(--shadow-sm);
}
.timeline-item__year {
  font-weight: 800;
  color: var(--color-accent-dark);
  font-size: 1.1rem;
  font-family: var(--font-heading);
}
.timeline-item__text {
  color: var(--color-gray);
  margin-top: 4px;
}

/* === Products Page === */
.products-hero {
  padding: 140px 0 70px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-white);
  text-align: center;
}
.products-hero__title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--color-white);
  margin-bottom: 14px;
}

.product-category {
  margin-bottom: 60px;
}
.category-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--color-light-gray);
}
.category-header__icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}
.category-header__title {
  font-size: 1.5rem;
  font-family: var(--font-body);
  font-weight: 700;
}

.product-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.product-item {
  background: var(--color-white);
  border: 1px solid var(--color-light-gray);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition);
}
.product-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.product-item__name {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}
.product-item__spec {
  font-size: 0.85rem;
  color: var(--color-gray);
  line-height: 1.6;
}

/* === Contact / RFQ Form === */
.contact-hero {
  padding: 140px 0 70px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-white);
  text-align: center;
}
.contact-hero__title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--color-white);
  margin-bottom: 14px;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: start;
}

.contact-info {
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px;
  height: fit-content;
}
.contact-info__title {
  font-size: 1.4rem;
  color: var(--color-white);
  margin-bottom: 28px;
  font-family: var(--font-body);
  font-weight: 700;
}
.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-start;
}
.contact-info-item__icon {
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-info-item__label {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.6);
  margin-bottom: 2px;
}
.contact-info-item__value {
  font-weight: 600;
  font-size: 0.98rem;
}

.rfq-form {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-light-gray);
}
.rfq-form__title {
  font-size: 1.4rem;
  margin-bottom: 28px;
  font-family: var(--font-body);
  font-weight: 700;
}

.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--color-dark-gray);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-light-gray);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-body);
  transition: var(--transition);
  background: var(--color-white);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26,58,92,0.1);
}
.form-group textarea {
  resize: vertical;
  min-height: 110px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* === Footer === */
.footer {
  background: var(--color-black);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer__brand p {
  margin-top: 14px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.55);
}
.footer__col-title {
  color: var(--color-white);
  font-size: 1rem;
  font-family: var(--font-body);
  font-weight: 700;
  margin-bottom: 20px;
}
.footer__links li {
  margin-bottom: 10px;
}
.footer__links a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
}
.footer__links a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}
.footer__bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 0.84rem;
  color: rgba(255,255,255,0.4);
}

/* === Factory Page === */
.factory-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 56px;
}
.factory-stat {
  text-align: center;
  padding: 32px 20px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-light-gray);
}
.factory-stat__num {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--color-accent-dark);
  font-family: var(--font-heading);
}
.factory-stat__label {
  font-size: 0.88rem;
  color: var(--color-gray);
  margin-top: 4px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.process-step {
  text-align: center;
  padding: 28px 20px;
  position: relative;
}
.process-step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  font-weight: 800;
  font-size: 1.1rem;
  margin: 0 auto 16px;
}
.process-step__title {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 8px;
  font-family: var(--font-body);
}
.process-step__desc {
  font-size: 0.85rem;
  color: var(--color-gray);
  line-height: 1.6;
}

/* === Responsive === */
@media (max-width: 1024px) {
  .hero__content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero__desc {
    margin-left: auto;
    margin-right: auto;
  }
  .hero__actions {
    justify-content: center;
  }
  .hero__stats {
    justify-content: center;
  }
  .hero__visual {
    display: none;
  }
  .about-content {
    grid-template-columns: 1fr;
  }
  .contact-layout {
    grid-template-columns: 1fr;
  }
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
  .factory-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 20px;
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%);
    transition: transform 0.3s ease;
    gap: 4px;
  }
  .nav.open {
    transform: translateY(0);
  }
  .nav__link {
    width: 100%;
    padding: 12px 16px;
    text-align: center;
  }
  .nav__toggle {
    display: flex;
  }
  .lang-switch {
    display: none;
  }
  .section {
    padding: 56px 0;
  }
  .products-grid {
    grid-template-columns: 1fr;
  }
  .advantages-grid {
    grid-template-columns: 1fr 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .factory-stats {
    grid-template-columns: 1fr 1fr;
  }
  .process-steps {
    grid-template-columns: 1fr 1fr;
  }
  .hero__stats {
    flex-direction: column;
    gap: 20px;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .process-steps {
    grid-template-columns: 1fr;
  }
  .cta-banner {
    padding: 36px 24px;
  }
  .rfq-form {
    padding: 24px;
  }
  .contact-info {
    padding: 28px;
  }
}

/* === Animations === */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Scroll to top button */
.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 46px;
  height: 46px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}
.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}
.scroll-top:hover {
  background: var(--color-accent);
  color: var(--color-black);
  transform: translateY(-3px);
}