/* ===== CSS Custom Properties ===== */
:root {
  --color-primary: #1a365d;
  --color-primary-light: #2a4a7f;
  --color-primary-dark: #0f2340;
  --color-accent: #0d9488;
  --color-accent-light: #14b8a6;
  --color-accent-dark: #0a7a70;
  --color-blue: #2e86de;
  --color-blue-light: #54a0ff;
  --color-white: #ffffff;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;
  --color-text: #1a202c;
  --color-text-light: #64748b;
  --color-text-inverse: #ffffff;

  --font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  --container-max: 1200px;
  --section-padding: 5rem 0;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
  --transition: 0.3s ease;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

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

/* ===== Utilities ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: var(--section-padding);
}

.section--gray {
  background-color: var(--color-gray-50);
}

.section--dark {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-text-inverse);
}

.section__title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  text-align: center;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.section__title--light {
  color: var(--color-white);
}

.section__subtitle {
  font-size: var(--font-size-lg);
  text-align: center;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section__subtitle--light {
  color: var(--color-gray-300);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

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

.btn--primary:hover {
  background: var(--color-blue-light);
  border-color: var(--color-blue-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(46, 134, 222, 0.4);
}

.btn--outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.4);
}

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

.btn--full {
  width: 100%;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.header.scrolled {
  border-bottom-color: var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 2rem;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo__text {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.03em;
}

/* Navigation */
.nav__list {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-600);
  position: relative;
  padding: 0.25rem 0;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-blue);
  transition: width var(--transition);
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Header actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  gap: 0.25rem;
  background: var(--color-gray-100);
  border-radius: var(--border-radius-sm);
  padding: 0.25rem;
}

.lang-switcher__btn {
  background: transparent;
  border: none;
  font-family: var(--font-family);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-gray-500);
  padding: 0.375rem 0.625rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition);
}

.lang-switcher__btn:hover {
  color: var(--color-primary);
}

.lang-switcher__btn.active {
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* Phone */
.header__phone {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
}

/* Mobile nav actions (hidden on desktop) */
.nav__mobile-actions {
  display: none;
}

.header__phone:hover {
  color: var(--color-blue);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg,
      var(--color-primary-dark) 0%,
      var(--color-primary) 40%,
      var(--color-primary-light) 100%
    );
  z-index: 0;
}

.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(13, 148, 136, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(46, 134, 222, 0.1) 0%, transparent 50%);
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero__content {
  position: relative;
  z-index: 1;
  color: var(--color-text-inverse);
  max-width: 800px;
  padding: 4rem 0;
}

.hero__title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}

.hero__subtitle {
  font-size: var(--font-size-xl);
  line-height: 1.6;
  opacity: 0.85;
  margin-bottom: 2.5rem;
  max-width: 640px;
  font-weight: 400;
}

.hero__buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ===== About ===== */
.about__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about__text p {
  margin-bottom: 1.25rem;
  color: var(--color-gray-600);
  line-height: 1.7;
}

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

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.stat {
  background: var(--color-gray-50);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  text-align: center;
  border: 1px solid var(--color-gray-100);
  transition: all var(--transition);
}

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

.stat__number {
  display: block;
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.stat__label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  margin-top: 0.25rem;
  font-weight: 500;
}

/* ===== Equipment Cards ===== */
.equipment__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.card {
  background: var(--color-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card__image {
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: var(--color-gray-100);
}

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

.card:hover .card__image img {
  transform: scale(1.05);
}

.card__body {
  padding: 1.5rem 2rem 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.card__desc {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  line-height: 1.6;
  flex: 1;
}

/* ===== Advantages ===== */
.advantages__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.advantage {
  text-align: center;
  padding: 2rem 1.5rem;
}

.advantage__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1.25rem;
  color: var(--color-accent);
}

.advantage__icon svg {
  width: 100%;
  height: 100%;
}

.advantage h3 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.advantage p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  line-height: 1.6;
}

/* ===== Industries ===== */
.industries__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.industry-card {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: 2rem;
  text-align: center;
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition);
  cursor: default;
}

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

.industry-card__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  color: var(--color-blue);
}

.industry-card__icon svg {
  width: 100%;
  height: 100%;
}

.industry-card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-primary);
}

/* ===== Services ===== */
.services__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.service {
  display: flex;
  gap: 1.5rem;
  padding: 2rem;
  background: var(--color-gray-50);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-gray-100);
  transition: all var(--transition);
}

.service:hover {
  background: var(--color-white);
  border-color: var(--color-gray-200);
  box-shadow: var(--shadow-md);
}

.service__number {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--color-accent);
  opacity: 0.3;
  line-height: 1;
  flex-shrink: 0;
  min-width: 3rem;
}

.service h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.service p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  line-height: 1.6;
}

/* ===== Contact ===== */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-sm);
  outline: none;
  transition: all var(--transition);
}

.form-input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.form-input:focus {
  border-color: var(--color-accent-light);
  background: rgba(255, 255, 255, 0.15);
}

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

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-info__item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-info__item svg {
  flex-shrink: 0;
  color: var(--color-accent-light);
  margin-top: 2px;
}

.contact-info__item strong {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 0.25rem;
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-info__item p {
  color: var(--color-gray-200);
}

.contact-map {
  border-radius: var(--border-radius);
  overflow: hidden;
  margin-top: 0.5rem;
}

.contact-map__placeholder {
  background: rgba(255, 255, 255, 0.08);
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
  height: 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
}

.contact-map__placeholder svg {
  color: var(--color-gray-400);
  opacity: 0.5;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: 3rem 0 1.5rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer__brand .logo__text {
  color: var(--color-white);
  display: inline-block;
  margin-bottom: 0.75rem;
}

.footer__brand p {
  font-size: var(--font-size-sm);
  line-height: 1.6;
  max-width: 360px;
}

.footer__nav h4,
.footer__contacts h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer__nav a {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  transition: color var(--transition);
}

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

.footer__contacts p {
  font-size: var(--font-size-sm);
  margin-bottom: 0.25rem;
}

.footer__bottom {
  padding-top: 1.5rem;
  text-align: center;
  font-size: var(--font-size-xs);
}

/* ===== Scroll Animations ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animation for grid children */
.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }

/* ===== Responsive: Tablet (768px) ===== */
@media (max-width: 1024px) {
  .equipment__grid,
  .advantages__grid,
  .industries__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .about__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 3.5rem 0;
    --header-height: 64px;
  }

  /* Hero centered on mobile */
  .hero__content {
    padding: 3rem 0;
    text-align: center;
    margin: 0 auto;
  }

  .hero__title {
    font-size: var(--font-size-3xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-lg);
    margin-left: auto;
    margin-right: auto;
  }

  .hero__buttons {
    flex-direction: column;
    align-items: center;
  }

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

  .section__title {
    font-size: var(--font-size-2xl);
  }

  .section__subtitle {
    font-size: var(--font-size-base);
    margin-bottom: 2rem;
  }

  /* Mobile nav */
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-white);
    box-shadow: var(--shadow-xl);
    padding: calc(var(--header-height) + 2rem) 2rem 2rem;
    transition: right var(--transition);
    z-index: 999;
  }

  .nav.open {
    right: 0;
  }

  .nav__list {
    flex-direction: column;
    gap: 0;
  }

  .nav__link {
    display: block;
    padding: 0.875rem 0;
    font-size: var(--font-size-base);
    border-bottom: 1px solid var(--color-gray-100);
  }

  .nav__link::after {
    display: none;
  }

  .nav__mobile-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-gray-200);
  }

  .nav__mobile-actions .lang-switcher {
    align-self: flex-start;
  }

  .nav__mobile-actions .header__phone {
    font-size: var(--font-size-base);
  }

  .hamburger {
    display: flex;
  }

  .header__actions {
    display: none;
  }

  /* Overlay */
  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 998;
  }

  .nav-overlay.visible {
    display: block;
  }

  /* Grids — single column, centered */
  .equipment__grid,
  .advantages__grid,
  .industries__grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

  .about__grid {
    text-align: center;
  }

  .about__stats {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Cards centered on mobile */
  .card__body {
    text-align: center;
  }

  .card__image {
    height: 200px;
  }

  /* Services centered on mobile */
  .service {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
  }

  .service__number {
    min-width: auto;
  }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .contact-info {
    text-align: center;
  }

  .contact-info__item {
    justify-content: center;
  }

  .contact-map__placeholder {
    margin: 0 auto;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .footer__brand p {
    max-width: none;
    margin-left: auto;
    margin-right: auto;
  }

  .footer__nav ul {
    align-items: center;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: var(--font-size-2xl);
  }

  .hero__subtitle {
    font-size: var(--font-size-base);
  }

  .stat {
    padding: 1.25rem;
  }

  .stat__number {
    font-size: var(--font-size-2xl);
  }

  .card__body {
    padding: 1.25rem;
  }

  .card__image {
    height: 180px;
  }

  .equipment__grid,
  .advantages__grid,
  .industries__grid {
    max-width: 100%;
  }

  .container {
    padding: 0 1rem;
  }
}