/* ============================================================
   SITE HEADER + MAIN NAV
   Rehber: minimal, ince, logo solda + linkler sağda.
   Sticky, ince border-bottom. Linkler uppercase + tracking.
   Mobile'de hamburger → tam ekran tipografik overlay.
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-bg);
  border-bottom: var(--border-thin);
  transition: background var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-7);
  min-height: 80px;
}

.site-header__brand {
  margin-right: auto;
}

/* === Brand === */
.site-header__brand {
  display: inline-flex;
  align-items: center;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.site-header__brand:hover {
  opacity: 0.7;
}

.site-header__logo {
  height: 44px;
  width: auto;
  display: block;
}

@media (max-width: 1024px) {
  .site-header__logo {
    height: 36px;
  }
}

/* === CTA (Teklif Al) === */
.site-header__cta {
  display: inline-flex;
  align-items: center;
  padding: var(--space-3) var(--space-5);
  background: var(--color-heading);
  color: var(--color-bg);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  border: 0;
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out);
}

.site-header__cta:hover {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

@media (max-width: 1024px) {
  .site-header__cta {
    padding: var(--space-2) var(--space-3);
    font-size: 11px;
  }
}

@media (max-width: 480px) {
  .site-header__cta {
    display: none;
  }
}

/* === Main Nav === */
.main-nav {
  display: flex;
  align-items: center;
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-7);
}

.main-nav__item {
  position: relative;
}

.main-nav__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-heading);
  padding: var(--space-2) 0;
  transition: color var(--duration-fast) var(--ease-out);
}

.main-nav__link:hover,
.main-nav__link[aria-expanded="true"] {
  color: var(--color-accent);
}

/* Submenu trigger (button) — link ile aynı görünüm */
.main-nav__trigger {
  background: none;
  border: 0;
  cursor: pointer;
  font-family: inherit;
}

.main-nav__chevron {
  transition: transform var(--duration-fast) var(--ease-out);
}

.main-nav__trigger[aria-expanded="true"] .main-nav__chevron {
  transform: rotate(180deg);
}

/* === Submenu (desktop dropdown) === */
.main-nav__submenu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--color-bg);
  border: var(--border-thin);
  padding: var(--space-3) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out),
              visibility 0s linear var(--duration-fast);
  z-index: var(--z-overlay);
}

.main-nav__item--has-submenu:hover .main-nav__submenu,
.main-nav__item--has-submenu:focus-within .main-nav__submenu,
.main-nav__trigger[aria-expanded="true"] + .main-nav__submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition-delay: 0s;
}

.main-nav__sublink {
  display: block;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--weight-regular);
  text-transform: none;
  letter-spacing: var(--tracking-normal);
  color: var(--color-text);
  white-space: nowrap;
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.main-nav__sublink:hover {
  color: var(--color-accent);
  background: var(--color-bg-alt);
}

/* === Hamburger Toggle === */
.main-nav__toggle {
  display: none;
  position: relative;
  width: 32px;
  height: 32px;
  z-index: calc(var(--z-modal) + 1);
}

.main-nav__toggle-bar {
  position: absolute;
  left: 4px;
  right: 4px;
  height: 1.5px;
  background: var(--color-heading);
  transition: transform var(--duration-fast) var(--ease-out),
              opacity var(--duration-fast) var(--ease-out),
              top var(--duration-fast) var(--ease-out);
}

.main-nav__toggle-bar:nth-child(1) { top: 10px; }
.main-nav__toggle-bar:nth-child(2) { top: 16px; }
.main-nav__toggle-bar:nth-child(3) { top: 22px; }

.main-nav__toggle[aria-expanded="true"] .main-nav__toggle-bar:nth-child(1) {
  top: 16px;
  transform: rotate(45deg);
}
.main-nav__toggle[aria-expanded="true"] .main-nav__toggle-bar:nth-child(2) {
  opacity: 0;
}
.main-nav__toggle[aria-expanded="true"] .main-nav__toggle-bar:nth-child(3) {
  top: 16px;
  transform: rotate(-45deg);
}

/* === Mobile (≤1024px) — fullscreen overlay === */
@media (max-width: 1024px) {
  .site-header__inner {
    min-height: 64px;
  }

  .main-nav__toggle {
    display: block;
  }

  .main-nav__list {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: var(--space-5);
    padding: var(--space-9) var(--container-pad);
    background: var(--color-bg);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-base) var(--ease-out),
                visibility 0s linear var(--duration-base);
    z-index: var(--z-modal);
  }

  .main-nav__toggle[aria-expanded="true"] ~ .main-nav__list {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
  }

  .main-nav__link {
    font-size: var(--text-2xl);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-wide);
    padding: var(--space-1) 0;
  }

  .main-nav__chevron {
    width: 16px;
    height: 12px;
  }

  /* Submenu mobile: accordion (statik, position dropdown değil) */
  .main-nav__submenu {
    position: static;
    min-width: 0;
    width: 100%;
    border: 0;
    padding: var(--space-3) 0 0 var(--space-5);
    background: transparent;
    opacity: 1;
    visibility: visible;
    transform: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--duration-base) var(--ease-out);
  }

  .main-nav__trigger[aria-expanded="true"] + .main-nav__submenu {
    max-height: 400px;
  }

  .main-nav__sublink {
    font-size: var(--text-lg);
    padding: var(--space-2) 0;
  }

  /* Body scroll lock */
  body.is-nav-open {
    overflow: hidden;
  }
}

/* ============================================================
   TRANSPARENT HEADER — sadece anasayfada (.home body class)
   Header fixed olur, hero tam viewport dolar.
   Scroll > 100px → .is-scrolled → beyaz arka plana döner.
   ============================================================ */

/* Fixed pozisyon, belge akışı dışı */
.home .site-header {
  position: fixed;
  width: 100%;
  background: transparent;
  border-bottom-color: transparent;
}

/* Scrolled state — beyaz header */
.home .site-header.is-scrolled {
  background: var(--color-bg);
  border-bottom-color: var(--color-border);
  box-shadow: 0 2px 24px rgba(0, 0, 0, 0.07);
}

/* Nav linkleri — beyaz */
.home .site-header:not(.is-scrolled) .main-nav__link,
.home .site-header:not(.is-scrolled) .main-nav__trigger {
  color: #fff;
  transition: color var(--duration-fast) var(--ease-out);
}

.home .site-header:not(.is-scrolled) .main-nav__link:hover,
.home .site-header:not(.is-scrolled) .main-nav__trigger:hover,
.home .site-header:not(.is-scrolled) .main-nav__link[aria-expanded="true"],
.home .site-header:not(.is-scrolled) .main-nav__trigger[aria-expanded="true"] {
  color: rgba(255, 255, 255, 0.65);
}

/* Logo — beyazlaştır */
.home .site-header:not(.is-scrolled) .site-header__logo {
  filter: brightness(0) invert(1);
  transition: filter var(--duration-base) var(--ease-out);
}

/* CTA butonu — outline/şeffaf */
.home .site-header:not(.is-scrolled) .site-header__cta {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.55);
}

.home .site-header:not(.is-scrolled) .site-header__cta:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.9);
  color: #fff;
}

/* Hamburger çizgileri — beyaz */
.home .site-header:not(.is-scrolled) .main-nav__toggle-bar {
  background: #fff;
}

/* Menü açıkken X butonu koyu renkte kalsın (overlay beyaz) */
.home .site-header:not(.is-scrolled) .main-nav__toggle[aria-expanded="true"] .main-nav__toggle-bar {
  background: var(--color-heading);
}