* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #2c5f2d;
  --color-primary-hover: #1e4520;
  --color-dark: #1a1a1a;
  --color-light: #f8f9fa;
  --color-gray: #6c757d;
  --color-white: #ffffff;
  
  --font-main: 'Roboto', system-ui, sans-serif;
  
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  --shadow: 0 4px 12px rgba(0,0,0,0.1);
  --radius: 8px;
}

body {
  font-family: var(--font-main);
  line-height: 1.6;
  color: var(--color-dark);
  background: var(--color-white);
}

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

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

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

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

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

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

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

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

.section {
  padding: var(--spacing-xl) 0;
}

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

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

.section__title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.header {
  position: sticky;
  top: 0;
  background: var(--color-white);
  box-shadow: var(--shadow);
  z-index: 100;
  padding: 1rem 0;
}

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

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 0.5px;
}

.nav__list {
  display: flex;
  gap: var(--spacing-md);
}

.nav__link {
  font-weight: 500;
  transition: color 0.3s;
}

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

.header__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
}

.header__toggle span {
  width: 24px;
  height: 3px;
  background: var(--color-dark);
  border-radius: 2px;
}

.nav__close {
  display: none;
}

.hero {
  background-image: url('images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  color: var(--color-white);
  text-align: center;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.25) 0%,
    transparent 45%,
    #ffffff 100%
  );
  z-index: 1;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  margin: 0 auto;
  padding: var(--spacing-md);
  padding-bottom: 120px;
}

.hero__title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero__subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.9;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.project-card {
  background: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}

.project-card:hover {
  transform: translateY(-5px);
}

.project-card__img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.project-card__body {
  padding: var(--spacing-md);
}

.project-card__title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.project-card__meta {
  color: var(--color-gray);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.project-card__desc {
  margin-bottom: var(--spacing-sm);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.service-item {
  text-align: center;
  padding: var(--spacing-md);
}

.service-item__icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.service-item__title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.about__list {
  margin-top: var(--spacing-sm);
}

.about__list li {
  margin-bottom: 0.5rem;
}

.about__img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.contacts__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.contacts__address,
.contacts__phone,
.contacts__email {
  margin-bottom: var(--spacing-sm);
  font-size: 1.1rem;
}

.contacts__phone a,
.contacts__email a {
  color: var(--color-primary);
  font-weight: 500;
}

.contacts__social {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.social-link {
  padding: 0.5rem 1rem;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius);
  transition: background 0.3s;
}

.social-link:hover {
  background: rgba(255,255,255,0.2);
}

.contact-form {
  background: var(--color-white);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  color: var(--color-dark);
}

.contact-form__title {
  margin-bottom: var(--spacing-md);
}

.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-label {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 500;
  font-size: 0.9rem;
}

.form-input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #ddd;
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.3s;
}

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

.form-input--textarea {
  resize: vertical;
  min-height: 100px;
}

.form-note {
  font-size: 0.8rem;
  color: var(--color-gray);
  margin-top: var(--spacing-sm);
  text-align: center;
}

.form-message {
  font-size: 0.95rem;
  font-weight: 500;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.contact-form button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.footer {
  background: #111;
  color: #aaa;
  padding: var(--spacing-md) 0;
  text-align: center;
  font-size: 0.9rem;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.footer__nav {
  display: flex;
  gap: var(--spacing-md);
}

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

.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.modal.active {
  display: flex;
}

.modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.7);
}

.modal__content {
  position: relative;
  background: var(--color-white);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  color: var(--color-dark);
}

.modal__close {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-gray);
}

.modal__close:hover {
  color: var(--color-dark);
}

@media (max-width: 768px) {
  .header__toggle { display: flex; }
  .nav {
    position: fixed; top: 0; right: -100%;
    width: 80%; max-width: 300px; height: 100vh;
    background: var(--color-white); padding: var(--spacing-lg) var(--spacing-md);
    transition: right 0.3s ease; box-shadow: -4px 0 12px rgba(0,0,0,0.1); z-index: 101;
  }
  .nav.active { right: 0; }
  .nav__list { flex-direction: column; gap: var(--spacing-md); }
  .nav__close {
    display: block; position: absolute; top: 1rem; right: 1rem;
    background: none; border: none; font-size: 2rem; cursor: pointer;
  }
  .about__grid, .contacts__grid { grid-template-columns: 1fr; }
  .footer__inner { flex-direction: column; text-align: center; }
  .hero__title { font-size: 2rem; }
  .section__title { font-size: 1.5rem; }
}