/* ===== Custom Properties ===== */
:root {
  --primary: #1B4332;
  --primary-light: #2D6A4F;
  --primary-dark: #0B2618;
  --accent: #E8871E;
  --accent-light: #F0A04B;
  --accent-dark: #C06B0A;
  --bg: #F5F6F0;
  --surface: #FFFFFF;
  --on-bg: #1A1A1A;
  --on-surface-variant: #5C6058;
  --border: #DDE0D5;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --header-h: 72px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  font-family: var(--font);
  color: var(--on-bg);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ===== Container ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn--lg { padding: 16px 36px; font-size: 16px; }
.btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn--primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(232,135,30,.3);
}
.btn--outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.4);
}
.btn--outline:hover {
  background: rgba(255,255,255,.1);
  border-color: #fff;
}
.btn--header { padding: 10px 24px; font-size: 14px; }

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 1000;
  transition: var(--transition);
  background: transparent;
}
.header.scrolled {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}
.header.scrolled .logo__text,
.header.scrolled .nav__link {
  color: var(--on-bg);
}
.header.scrolled .burger span {
  background: var(--on-bg);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 1001;
}
.logo__svg {
  height: 36px;
  width: auto;
}
.logo__letter {
  fill: #fff;
  transition: fill var(--transition);
}
.logo__roof {
  fill: #E8871E;
}
.header.scrolled .logo__letter {
  fill: var(--primary);
  stroke: var(--primary);
}
.logo__text {
  font-weight: 700;
  font-size: 17px;
  color: #fff;
  transition: var(--transition);
}
.header.scrolled .logo__text { color: var(--primary); }

/* Nav */
.nav {
  display: flex;
  gap: 28px;
}
.nav__link {
  font-weight: 500;
  font-size: 14px;
  color: rgba(255,255,255,.8);
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: var(--transition);
}
.nav__link:hover { color: #fff; }
.nav__link:hover::after { width: 100%; }
.nav__link.active::after { width: 100%; }
.header.scrolled .nav__link { color: var(--on-surface-variant); }
.header.scrolled .nav__link:hover { color: var(--primary); }
.header.scrolled .nav__link.active { color: var(--primary); }

/* Header right */
.header__right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Lang Switcher */
.lang-switcher { position: relative; }
.lang-switcher__btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  color: #fff;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}
.header.scrolled .lang-switcher__btn {
  background: var(--bg);
  border-color: var(--border);
  color: var(--on-bg);
}
.lang-switcher__btn:hover { background: rgba(255,255,255,.2); }
.header.scrolled .lang-switcher__btn:hover { background: var(--border); }
.lang-switcher__dropdown {
  position: absolute;
  top: calc(100% + 8px); right: 0;
  background: var(--surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 6px;
  min-width: 170px;
  opacity: 0; visibility: hidden;
  transform: translateY(-8px);
  transition: var(--transition);
}
.lang-switcher__dropdown.open {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.lang-option {
  display: block; width: 100%;
  padding: 10px 14px;
  border: none; background: none;
  text-align: left;
  font-size: 14px; font-weight: 500;
  color: var(--on-bg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}
.lang-option:hover { background: var(--bg); }
.lang-option.active { background: var(--primary); color: #fff; }

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}
.burger span {
  width: 24px; height: 2px;
  background: #fff;
  transition: var(--transition);
  border-radius: 2px;
}
.burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 0 80px;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, var(--primary-dark) 0%, var(--primary) 40%, var(--primary-light) 100%);
  z-index: -2;
}
.hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 70% 20%, rgba(232,135,30,.2) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(45,106,79,.4) 0%, transparent 50%);
}
.hero__bg::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--bg), transparent);
}
.hero__content {
  text-align: center;
  color: #fff;
  position: relative;
}
.hero__badge {
  display: inline-block;
  padding: 8px 24px;
  background: rgba(232,135,30,.2);
  border: 1px solid rgba(232,135,30,.4);
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 28px;
  animation: fadeInDown .7s ease;
}
.hero__title {
  font-size: clamp(40px, 7vw, 80px);
  font-weight: 800;
  letter-spacing: 2px;
  margin-bottom: 12px;
  animation: fadeInUp .7s ease;
}
.hero__subtitle {
  font-size: clamp(18px, 3vw, 26px);
  font-weight: 500;
  opacity: .9;
  margin-bottom: 12px;
  animation: fadeInUp .7s ease .1s both;
}
.hero__slogan {
  font-size: clamp(15px, 2vw, 18px);
  opacity: .7;
  max-width: 650px;
  margin: 0 auto 40px;
  line-height: 1.7;
  animation: fadeInUp .7s ease .2s both;
}
.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
  animation: fadeInUp .7s ease .3s both;
}
.hero__stats {
  display: flex;
  justify-content: center;
  gap: 56px;
  flex-wrap: wrap;
  animation: fadeInUp .7s ease .4s both;
}
.stat { text-align: center; }
.stat__number {
  font-size: 48px;
  font-weight: 800;
  color: var(--accent-light);
  display: inline;
}
.stat__plus {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent-light);
}
.stat__label {
  display: block;
  font-size: 14px;
  opacity: .75;
  margin-top: 4px;
}
.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
  color: rgba(255,255,255,.4);
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== Section Titles ===== */
.section__title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  color: var(--primary);
}
.section__title--left { text-align: left; }
.section__desc {
  text-align: center;
  color: var(--on-surface-variant);
  font-size: 16px;
  margin-bottom: 48px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Services ===== */
.services { padding: 80px 0 100px; }
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 0;
  background: var(--accent);
  transition: height .4s ease;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.service-card:hover::before { height: 100%; }
.service-card__icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.service-card__icon .material-icons-outlined { font-size: 28px; color: #fff; }
.service-card__title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--primary);
}
.service-card__text {
  color: var(--on-surface-variant);
  font-size: 14px;
  line-height: 1.7;
}

/* ===== About ===== */
.about {
  padding: 80px 0 100px;
  background: var(--surface);
}
.about__grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 48px;
  align-items: start;
}
.about__text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--on-surface-variant);
  margin-bottom: 16px;
}
.about__details {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}
.about__detail {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  background: var(--bg);
  border-radius: var(--radius-md);
}
.about__detail .material-icons-outlined {
  font-size: 22px;
  color: var(--primary);
  margin-top: 2px;
}
.about__detail div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.about__detail strong {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--on-surface-variant);
}
.about__detail span { font-size: 14px; font-weight: 500; }

/* About visual block */
.about__visual {
  background: linear-gradient(145deg, var(--primary-dark), var(--primary));
  border-radius: var(--radius-xl);
  padding: 48px 32px;
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.about__visual::before {
  content: '';
  position: absolute;
  top: -50px; right: -50px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(232,135,30,.2), transparent 70%);
  border-radius: 50%;
}
.about__visual-icon {
  margin-bottom: 20px;
}
.about__visual-icon .material-icons-outlined {
  font-size: 64px;
  color: var(--accent-light);
}
.about__visual-text {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 32px;
  line-height: 1.4;
}
.about__visual-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.about__visual-stats > div {
  background: rgba(255,255,255,.1);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.about__visual-stats strong {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent-light);
}
.about__visual-stats span { font-size: 12px; opacity: .8; }

/* ===== Projects ===== */
.projects {
  padding: 80px 0 100px;
}
.projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.project-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.project-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.project-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.project-card__header .material-icons-outlined {
  font-size: 32px;
  color: var(--primary);
}
.project-card__tag {
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  background: #E8F5E9;
  color: #2E7D32;
}
.project-card__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
  line-height: 1.4;
}
.project-card__text {
  font-size: 14px;
  color: var(--on-surface-variant);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 20px;
}
.project-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.project-card__sum {
  font-weight: 700;
  font-size: 16px;
  color: var(--accent-dark);
}
.project-card__year {
  font-size: 13px;
  color: var(--on-surface-variant);
}

/* ===== Advantages ===== */
.advantages {
  padding: 80px 0 100px;
  background: linear-gradient(145deg, var(--primary-dark), var(--primary));
  color: #fff;
  position: relative;
  overflow: hidden;
}
.advantages::before {
  content: '';
  position: absolute;
  top: -80px; right: -60px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(232,135,30,.15), transparent 70%);
  border-radius: 50%;
}
.advantages .section__title { color: #fff; }
.advantages .section__desc { color: rgba(255,255,255,.7); }
.advantages__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.advantage-card {
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
}
.advantage-card:hover {
  background: rgba(255,255,255,.14);
  transform: translateY(-3px);
}
.advantage-card__number {
  font-size: 36px;
  font-weight: 800;
  color: var(--accent-light);
  opacity: .5;
  margin-bottom: 12px;
}
.advantage-card__title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}
.advantage-card__text {
  font-size: 14px;
  line-height: 1.7;
  opacity: .8;
}

/* ===== Contacts ===== */
.contacts {
  padding: 80px 0 100px;
  background: var(--surface);
}
.contacts__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.contacts__info {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.contact-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--bg);
  border-radius: var(--radius-md);
  transition: var(--transition);
}
.contact-row:hover { box-shadow: var(--shadow-sm); }
.contact-row__icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-row__icon .material-icons-outlined { color: #fff; font-size: 22px; }
.contact-row__content { flex: 1; }
.contact-row__label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--on-surface-variant);
  font-weight: 600;
  margin-bottom: 2px;
}
.contact-row__value {
  font-size: 14px;
  font-weight: 500;
  color: var(--on-bg);
}
.contacts__map {
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 400px;
  box-shadow: var(--shadow-md);
}

/* ===== Footer ===== */
.footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,.8);
  padding: 48px 0 32px;
}
.footer__inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.footer__brand .logo__text { color: #fff; }
.footer__tagline { font-size: 14px; opacity: .7; margin-top: 8px; }
.footer__copy { font-size: 13px; opacity: .5; margin-top: 12px; }
.footer__links h4,
.footer__info h4 {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
  color: var(--accent-light);
}
.footer__links { display: flex; flex-direction: column; gap: 10px; }
.footer__link { font-size: 14px; opacity: .7; transition: var(--transition); }
.footer__link:hover { opacity: 1; color: var(--accent-light); }
.footer__info { display: flex; flex-direction: column; gap: 8px; font-size: 14px; }
.footer__info a { opacity: .7; transition: var(--transition); }
.footer__info a:hover { color: var(--accent-light); opacity: 1; }
.footer__info p { opacity: .7; }

/* ===== Back to top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden;
  transform: translateY(16px);
  transition: var(--transition);
  z-index: 100;
}
.back-to-top.visible {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.back-to-top:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
[data-animate] {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity .6s ease, transform .6s ease;
}
[data-animate].animated {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .services__grid { grid-template-columns: repeat(2, 1fr); }
  .projects__grid { grid-template-columns: repeat(2, 1fr); }
  .advantages__grid { grid-template-columns: repeat(2, 1fr); }
  .about__grid { grid-template-columns: 1fr; gap: 40px; }
  .contacts__grid { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 768px) {
  :root { --header-h: 64px; }
  .nav {
    position: fixed;
    inset: 0;
    background: var(--primary-dark);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    opacity: 0; visibility: hidden;
    transition: var(--transition);
  }
  .nav.open { opacity: 1; visibility: visible; }
  .nav__link {
    font-size: 20px;
    color: rgba(255,255,255,.9) !important;
  }
  .burger { display: flex; }
  .btn--header { display: none; }
  .hero__stats { gap: 32px; }
  .services__grid,
  .projects__grid,
  .advantages__grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero__stats { flex-direction: column; gap: 20px; }
  .stat__number { font-size: 36px; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .btn--lg { text-align: center; justify-content: center; }
}