/* ============================================================
   HEADER.CSS — Sticky header, nav, search, hamburger drawer
   Real Estate World Modern UI
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255,255,255,0.82);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid rgba(226,232,240,0.6);
  transition: background var(--t-base), border-color var(--t-base), box-shadow var(--t-base);
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  height: 100%;
}

/* Logo */
.site-logo {
  font-family: var(--font-heading);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.5px;
  white-space: nowrap;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 2px;
  transition: opacity var(--t-fast);
}
.site-logo:hover { opacity: 0.85; color: var(--color-text); }
.logo-accent { color: var(--color-primary); }
.logo-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: inline-block;
  margin-bottom: -2px;
  margin-left: 1px;
}

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: var(--sp-5);
}
.site-nav a {
  display: flex;
  align-items: center;
  padding: 7px 15px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: background var(--t-base), color var(--t-base);
}
.site-nav a:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text);
}
.site-nav a.active {
  background: linear-gradient(135deg, var(--color-primary-light), #dbeafe);
  color: var(--color-primary-dark);
  font-weight: 600;
}

/* Header controls */
.header-controls {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-left: auto;
}

/* Icon button */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background var(--t-base), color var(--t-base), transform var(--t-fast);
  flex-shrink: 0;
}
.icon-btn:hover { background: var(--color-bg-tertiary); color: var(--color-text); }
.icon-btn:active { transform: scale(0.9); }

/* Search */
.search-wrapper { display: flex; align-items: center; position: relative; }
.search-input-wrapper {
  position: absolute;
  right: 44px;
  top: 50%;
  transform: translateY(-50%);
  width: 240px;
  overflow: hidden;
  opacity: 1;
  pointer-events: auto;
  transition: width var(--t-base), opacity var(--t-base);
}
.search-input {
  width: 240px;
  padding: 9px 18px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--t-base), box-shadow var(--t-base), background var(--t-base);
}
.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(14,165,233,0.12);
}

/* Theme toggle icons */
.theme-toggle-btn .icon-moon,
[data-theme-toggle] .icon-moon { display: block; }
.theme-toggle-btn .icon-sun,
[data-theme-toggle] .icon-sun  { display: none; }
[data-theme="dark"] .theme-toggle-btn .icon-moon,
[data-theme="dark"] [data-theme-toggle] .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle-btn .icon-sun,
[data-theme="dark"] [data-theme-toggle] .icon-sun  { display: block; }

/* Hamburger */
.hamburger-btn {
  display: none;
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}
.hamburger-btn:hover { background: var(--color-bg-tertiary); }

/* Drawer overlay */
.drawer-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(3px);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--t-base);
}
.drawer-overlay.active { opacity: 1; }

/* Mobile drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  left: -310px;
  width: 290px;
  height: 100dvh;
  background: var(--color-bg);
  z-index: 999;
  padding: var(--sp-10) var(--sp-6) var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
  transition: left var(--t-base), background var(--t-base);
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
}
.mobile-drawer.open { left: 0; }

.drawer-logo {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
}

.mobile-drawer nav {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-top: var(--sp-3);
}
.mobile-drawer nav a {
  display: flex;
  align-items: center;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: background var(--t-base), color var(--t-base);
}
.mobile-drawer nav a:hover { background: var(--color-bg-tertiary); color: var(--color-text); }

.drawer-close-btn {
  position: absolute;
  top: var(--sp-4); right: var(--sp-4);
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full);
  background: var(--color-bg-tertiary);
  color: var(--color-text);
  border: none; cursor: pointer;
  transition: background var(--t-base), transform var(--t-fast);
}
.drawer-close-btn:hover { background: var(--color-border); transform: rotate(90deg); }

/* Ad slot */
.ad-slot-below-header {
  width: 100%;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  font-size: 11px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

/* Responsive */
@media (max-width: 1024px) {
  .site-nav { display: none; }
  .hamburger-btn { display: flex; }
  .drawer-overlay { display: block; }
}
@media (max-width: 480px) {
  .search-input-wrapper.open { width: 180px; }
  .search-input { width: 180px; }
}