:root {
  --color-primary: #39a1ff;
  --color-secondary: #00c3ed;
  --color-dark-bg: #111827;
  --color-dark-text: #374151;
  --color-light-text: #d1d5db;
  --color-light-gray-text: #9ca3af;
  --color-white: #ffffff;
  --color-overlay: rgba(17, 17, 17, 0.8);
  --color-light-blue-bg: #eff6ff;
  --color-dark-blue-text: #0a3469;
}

body {
  margin: 0;
  font-family: 'Segoe UI', 'Poppins', sans-serif;
  background-color: var(--color-white);
  color: var(--color-dark-text);
}

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

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Mobile Navigation */
.mobile-nav-toggle {
  background: none;
  border: none;
  display: none;
  flex-direction: column;
  gap: 4px;
  margin-left: auto;
  cursor: pointer;
}
.mobile-nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-dark-text);
}

@media (max-width: 1024px) {
  .main-nav { display: none; }
  .mobile-nav-toggle { display: inline-flex; }
}

.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 2000;
}
.mobile-nav-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav {
  position: fixed;
  right: -100%;
  top: 0;
  height: 100vh;
  width: 80%;
  max-width: 320px;
  background: var(--color-white);
  box-shadow: -4px 0 24px rgba(0,0,0,0.12);
  transition: right 0.3s ease;
  z-index: 2001;
  display: flex;
  flex-direction: column;
  padding: 20px;
}
.mobile-nav.active { right: 0; }
.mobile-nav__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.mobile-nav__title { font-weight: 700; }
.mobile-nav__close {
  background: none;
  border: none;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}
.mobile-nav__links { display: flex; flex-direction: column; gap: 14px; }
.mobile-nav__links a { font-weight: 600; color: var(--color-dark-text); }
.mobile-nav__footer { margin-top: auto; color: var(--color-light-gray-text); }

/* Responsive Styles */
@media (max-width: 1024px) {
  .footer-main {
    grid-template-columns: 1fr 1fr !important;
  }
  .container {
    padding: 0 16px;
  }
}

@media (max-width: 992px) {
  /* Διόρθωση: η σελίδα χρησιμοποιεί .main-nav */
  .main-nav { display: none; }
}

@media (max-width: 768px) {
  .container {
    padding: 0 12px;
  }
  /* Στοίχιση κάθετα των στηλών tracking σε mobile */
  .tracking-container { flex-direction: column; gap: 20px; }
  .tracking-left-col { width: 100%; height: 420px; }
  .tracking-right-col { width: 100%; height: auto; padding: 24px; }
  .left-col-title { font-size: 24px; }
  .left-col-subtitle { font-size: 16px; }
  .form-content { gap: 24px; }
  .footer-main {
    grid-template-columns: 1fr !important;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  .btn {
    padding: 12px 20px;
    font-size: 16px;
  }
  h1, h2 {
    font-size: 28px;
  }
  h3 {
    font-size: 22px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 8px;
  }
  .tracking-left-col { height: 360px; }
  .tracking-left-col .technician-img {
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: auto;
    margin-left: 0;
  }
  .btn {
    padding: 10px 16px;
    font-size: 14px;
  }
  h1, h2 {
    font-size: 24px;
  }
  h3 {
    font-size: 20px;
  }
  .form-group label {
    font-size: 14px;
  }
  .form-group input,
  .form-group textarea,
  .form-group select {
    font-size: 16px;
    padding: 12px;
  }
}

@media (max-width: 360px) {
  .container {
    padding: 0 6px;
  }
  h1, h2 {
    font-size: 22px;
  }
  h3 {
    font-size: 18px;
  }
}