/* css/header.css */
:root {
  --primary: #1A7A6E;
  --primary-dark: #0F5A50;
  --text-dark: #1E2A2E;
  --text-light: #4A5B62;
  --bg-white: #FFFFFF;
  --border: #E2E8E6;
}

.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--bg-white);
  z-index: 1000;
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
  padding: 0 5%;
}

.site-header.scrolled {
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.header-inner {
  max-width: 1320px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.nav-desktop {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-desktop a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  font-size: 0.85rem;
  transition: color 0.2s;
}

.nav-desktop a:hover,
.nav-desktop a.active {
  color: #1a7a6e;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 2px;
  background: var(--text-dark);
  transition: 0.2s;
}

.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

.nav-mobile {
  position: fixed;
  top: 70px;
  right: -100%;
  width: 80%;
  max-width: 280px;
  height: calc(100vh - 70px);
  background: var(--bg-white);
  flex-direction: column;
  padding: 2rem;
  gap: 1.5rem;
  transition: right 0.3s;
  box-shadow: -2px 0 10px rgba(0,0,0,0.05);
  z-index: 999;
}

.nav-mobile.open {
  right: 0;
}

.nav-mobile a {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  display: block;
}

@media (max-width: 768px) {
  .nav-desktop { display: none; }
  .hamburger { display: flex; }
  .nav-mobile { display: flex; }
}