:root {
  --primary: #308dc8;
  --secondary: #455a64;
  --gray: #6c757d;
  --light-gray: #f8f9fa;
  --dark-gray: #343a40;

  --font-family: 'Montserrat', sans-serif;
  --font-weight-bold: 700;
  --font-weight-medium: 600;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 3rem;

  --border-radius: 8px;
  --btn-padding: 0.8rem 2rem;
  --transition-duration: 0.3s;
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  --shadow-light: 0 2px 15px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 5px 15px rgba(0, 0, 0, 0.08);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  color: var(--dark-gray);
  background-color: var(--light-gray);
  margin: 0;
  padding: 0;
}

/* Заголовки */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--secondary);
}

/* Посилання */
a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-duration) var(--ease-in-out);
}
a:hover,
a:focus-visible {
  color: var(--secondary);
  outline: none;
}

/* Фокус для доступності */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Кнопки */
.btn,
.contact-form button {
  background-color: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--border-radius);
  padding: var(--btn-padding);
  cursor: pointer;
  transition: background-color var(--transition-duration) var(--ease-in-out),
              box-shadow var(--transition-duration) var(--ease-in-out);
  font-weight: var(--font-weight-medium);
  display: inline-block;
  text-align: center;
  user-select: none;
  box-shadow: var(--shadow-light);
}

.btn:hover,
.contact-form button:hover,
.btn:focus-visible,
.contact-form button:focus-visible {
  background-color: #0062cc;
  box-shadow: var(--shadow-medium);
  outline: none;
}

/* Форма контакту */
.contact-form {
  background-color: #fff;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  max-width: 600px;
  margin: var(--spacing-lg) auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.contact-form input,
.contact-form textarea {
  padding: var(--spacing-sm);
  border: 1px solid var(--gray);
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: 1rem;
  resize: vertical;
  transition: border-color var(--transition-duration) var(--ease-in-out);
}

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

/* Навігація */
.navbar {
  background-color: #fff;
  box-shadow: var(--shadow-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.navbar .logo {
  font-weight: var(--font-weight-bold);
  font-size: 1.5rem;
  color: var(--primary);
}

.navbar .nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.navbar .nav-link {
  color: var(--secondary);
  font-weight: var(--font-weight-medium);
  padding: 0.5rem 0;
  transition: color var(--transition-duration) var(--ease-in-out);
  cursor: pointer;
}
.navbar .nav-link:hover,
.navbar .nav-link:focus-visible {
  color: var(--primary);
  outline: none;
}

/* Галерея портфоліо */
.portfolio {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.portfolio-item {
  background: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-duration) var(--ease-in-out);
  will-change: transform, opacity;
}

.portfolio-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-medium);
}

.portfolio-item img {
  width: 100%;
  height: auto;
  object-fit: cover;
  flex-shrink: 0;
}

.portfolio-item .description {
  padding: var(--spacing-md);
  color: var(--secondary);
  font-size: 1rem;
  flex-grow: 1;
}

/* Ховання елементів портфоліо */
.portfolio-item.hidden {
  opacity: 0;
  height: 0;
  padding: 0;
  margin: 0;
  overflow: hidden;
  pointer-events: none;
  transition: opacity var(--transition-duration) var(--ease-in-out),
              height var(--transition-duration) var(--ease-in-out),
              padding var(--transition-duration) var(--ease-in-out),
              margin var(--transition-duration) var(--ease-in-out);
}

/* Анімації */
.animate {
  animation-duration: 1s;
  animation-fill-mode: both;
  will-change: opacity, transform;
}

/* Медіа-запити */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-sm);
  }
  .navbar .nav-links {
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
  }
  .navbar .nav-link {
    width: 100%;
    padding: var(--spacing-sm) 0;
  }
  .contact-form {
    padding: var(--spacing-md);
    margin: var(--spacing-md);
  }
}

@media (max-width: 400px) {
  body {
    font-size: 14px;
  }
  .btn,
  .contact-form button {
    padding: 0.6rem 1.5rem;
  }
}
.portfolio-img {
  transition: transform 0.3s ease;
}
.portfolio-item:hover .portfolio-img {
  transform: scale(1.03);
}
.text-truncate-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.empty-state {
  max-width: 500px;
  margin: 0 auto;
}