/* ==========================================================================
   LAYOUT — header, mobil navigasyon, bottom action bar, footer
   ========================================================================== */

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: var(--z-header);
  height: var(--header-h);
  display: flex; align-items: center;
  background: transparent;
  border-bottom: var(--bw) solid transparent;
  transition: height var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out), border-color var(--dur-base), box-shadow var(--dur-base);
}
.site-header.is-scrolled {
  height: var(--header-h-scrolled);
  background: rgba(246, 245, 242, .78);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom-color: var(--c-line);
}
.site-header.is-dark { color: var(--c-dark-ink); }
.site-header.is-dark.is-scrolled { background: rgba(13, 15, 18, .72); border-bottom-color: var(--c-dark-line); }

.header-inner { display: flex; align-items: center; gap: 1.5rem; width: 100%; }

.brand { display: inline-flex; align-items: center; flex: none; min-height: var(--touch); }
.brand img { height: 40px; width: auto; transition: height var(--dur-base) var(--ease-out); }
.site-header.is-scrolled .brand img { height: 34px; }
@media (max-width: 575.98px) { .brand img { height: 32px; } .site-header.is-scrolled .brand img { height: 28px; } }
/* Açık zemin: koyu-yazılı logo; koyu zemin: orijinal beyaz logo */
.brand .logo-on-dark { display: none; }
.theme-dark .brand .logo-on-light, .site-header.is-dark .brand .logo-on-light { display: none; }
.theme-dark .brand .logo-on-dark, .site-header.is-dark .brand .logo-on-dark { display: block; }

.nav-main { display: none; margin-inline: auto; }
.nav-main ul { display: flex; gap: .25rem; }
.nav-main a {
  position: relative; display: inline-flex; align-items: center;
  min-height: 42px; padding: 0 .9rem; border-radius: var(--r-sm);
  font-size: var(--fs-body-sm); font-weight: var(--fw-medium); color: var(--c-ink-2); letter-spacing: -.005em;
  transition: color var(--dur-fast), background var(--dur-fast);
}
.nav-main a:hover { color: var(--c-ink); background: rgba(13,15,18,.05); }
.nav-main a[aria-current="page"] { color: var(--c-ink); }
.nav-main a[aria-current="page"]::after {
  content: ""; position: absolute; left: .85rem; right: .85rem; bottom: 6px; height: 2px; border-radius: 2px; background: var(--c-accent);
}
.site-header.is-dark .nav-main a { color: var(--c-dark-ink-2); }
.site-header.is-dark .nav-main a:hover { color: #fff; background: rgba(255,255,255,.07); }
.site-header.is-dark .nav-main a[aria-current="page"] { color: #fff; }

.header-actions { display: flex; align-items: center; gap: .6rem; margin-left: auto; }
.header-actions .btn-cta { padding-inline: 1.5rem; }
.header-actions .link-track { display: none; }
.header-actions .btn-cta { display: none; }
@media (min-width: 992px) {
  .nav-main { display: block; }
  .header-actions .link-track { display: inline-flex; }
  .header-actions .btn-cta { display: inline-flex; }
  .header-actions .nav-toggle { display: none; }
}
@media (min-width: 1200px) { .nav-main a { padding-inline: 1rem; } }

.link-track {
  display: inline-flex; align-items: center; gap: .45rem; min-height: 40px; padding: 0 .75rem;
  font-size: var(--fs-body-sm); font-weight: var(--fw-medium); color: var(--c-ink-2); border-radius: var(--r-sm);
}
.link-track:hover { color: var(--c-ink); background: rgba(13,15,18,.05); }
.link-track .icon { width: 16px; height: 16px; }
.site-header.is-dark .link-track { color: var(--c-dark-ink-2); }

.nav-toggle {
  width: var(--touch); height: var(--touch); display: grid; place-items: center; border-radius: var(--r-sm);
  color: var(--c-ink);
}
.nav-toggle:hover { background: rgba(13,15,18,.05); }
.site-header.is-dark .nav-toggle { color: #fff; }
.nav-toggle .bars { width: 20px; height: 12px; position: relative; display: block; }
.nav-toggle .bars::before, .nav-toggle .bars::after {
  content: ""; position: absolute; left: 0; width: 100%; height: 1.75px; background: currentColor; border-radius: 2px;
  transition: transform var(--dur-base) var(--ease-out), top var(--dur-base) var(--ease-out), width var(--dur-base);
}
.nav-toggle .bars::before { top: 0; }
.nav-toggle .bars::after { top: 10px; width: 70%; }
.nav-toggle[aria-expanded="true"] .bars::before { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bars::after { top: 5px; width: 100%; transform: rotate(-45deg); }

/* ---------- Mobil navigasyon paneli ---------- */
.mobile-nav {
  position: fixed; inset: 0; z-index: var(--z-nav);
  background: var(--c-dark); color: var(--c-dark-ink);
  display: flex; flex-direction: column;
  padding: 0 var(--gutter) calc(var(--bottombar-h) + 1rem);
  clip-path: inset(0 0 100% 0);
  visibility: hidden;
  transition: clip-path var(--dur-slow) var(--ease-inout), visibility 0s linear var(--dur-slow);
  overflow-y: auto;
}
.mobile-nav.is-open { clip-path: inset(0 0 0 0); visibility: visible; transition-delay: 0s; }
.mobile-nav::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(var(--c-grid-dot-dark) 1px, transparent 1.2px); background-size: 28px 28px;
  -webkit-mask-image: linear-gradient(to bottom, #000 30%, transparent); mask-image: linear-gradient(to bottom, #000 30%, transparent);
}
.mobile-nav-top { height: var(--header-h); display: flex; align-items: center; justify-content: space-between; flex: none; }
@media (max-width: 575.98px) { .mobile-nav-top { height: var(--header-h-scrolled); } }
.mobile-nav-top .brand img { height: 30px; }
.mobile-nav-close { width: var(--touch); height: var(--touch); display: grid; place-items: center; border-radius: 50%; color: #fff; border: 1px solid var(--c-dark-line-2); }
.mobile-nav-list { flex: 1; display: grid; align-content: start; padding-top: 1.5rem; gap: .1rem; }
.mobile-nav-list a {
  display: flex; align-items: center; justify-content: space-between;
  padding: .9rem 0; min-height: var(--touch);
  font-size: clamp(1.5rem, 1.2rem + 1.6vw, 2rem); font-weight: var(--fw-medium); letter-spacing: var(--ls-snug);
  color: var(--c-dark-ink); border-bottom: 1px solid var(--c-dark-line);
  opacity: 0; transform: translateY(10px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out), color var(--dur-fast);
}
.mobile-nav-list a .idx { font-family: var(--ff-mono); font-size: var(--fs-mono); color: var(--c-dark-ink-3); letter-spacing: var(--ls-mono); }
.mobile-nav-list a:hover, .mobile-nav-list a[aria-current="page"] { color: var(--c-accent); }
.mobile-nav.is-open .mobile-nav-list a { opacity: 1; transform: none; }
.mobile-nav.is-open .mobile-nav-list a:nth-child(1) { transition-delay: 120ms; }
.mobile-nav.is-open .mobile-nav-list a:nth-child(2) { transition-delay: 160ms; }
.mobile-nav.is-open .mobile-nav-list a:nth-child(3) { transition-delay: 200ms; }
.mobile-nav.is-open .mobile-nav-list a:nth-child(4) { transition-delay: 240ms; }
.mobile-nav.is-open .mobile-nav-list a:nth-child(5) { transition-delay: 280ms; }
.mobile-nav.is-open .mobile-nav-list a:nth-child(6) { transition-delay: 320ms; }
.mobile-nav.is-open .mobile-nav-list a:nth-child(7) { transition-delay: 360ms; }
.mobile-nav-foot { display: grid; gap: .75rem; padding-top: 1.5rem; }
.mobile-nav-foot .contact-row { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.mobile-nav-foot .contact-row a {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: var(--control-h);
  border: 1px solid var(--c-dark-line-2); border-radius: var(--r-md); font-size: var(--fs-body-sm); font-weight: var(--fw-medium); color: var(--c-dark-ink);
}
.mobile-nav-foot .contact-row a:hover { border-color: rgba(255,255,255,.4); }
.mobile-nav-foot .t-caption { color: var(--c-dark-ink-3); }

/* ---------- Mobile bottom action bar ---------- */
.bottom-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: var(--z-sticky);
  height: calc(var(--bottombar-h) + env(safe-area-inset-bottom));
  padding: .5rem var(--gutter) calc(.5rem + env(safe-area-inset-bottom));
  background: rgba(255,255,255,.86);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-top: var(--bw) solid var(--c-line);
  display: grid; grid-template-columns: auto auto 1fr; gap: .5rem;
  transform: translateY(0);
  transition: transform var(--dur-slow) var(--ease-out);
}
.bottom-bar.is-hidden { transform: translateY(110%); }
.bottom-bar .btn { min-height: 48px; border-radius: var(--r-md); }
.bottom-bar .btn-icon { width: 48px; }
.bottom-bar .btn-icon .icon { width: 20px; height: 20px; }
@media (min-width: 992px) { .bottom-bar { display: none; } }
@media (max-width: 991.98px) { body { padding-bottom: calc(var(--bottombar-h) + env(safe-area-inset-bottom)); } }
body.no-bottom-bar { padding-bottom: 0; }
body.no-bottom-bar .bottom-bar { display: none; }

/* ---------- Footer ---------- */
.site-footer {
  position: relative; overflow: hidden;
  background: var(--c-dark); color: var(--c-dark-ink-2);
  padding-top: clamp(3.5rem, 2.5rem + 4vw, 6rem);
}
.site-footer::before {
  content: ""; position: absolute; inset: 0 0 auto; height: 60%; pointer-events: none;
  background-image: radial-gradient(var(--c-grid-dot-dark) 1px, transparent 1.2px); background-size: 28px 28px;
  -webkit-mask-image: linear-gradient(to bottom, #000, transparent); mask-image: linear-gradient(to bottom, #000, transparent);
}
.footer-route { position: absolute; left: 0; right: 0; top: 0; height: 2px; pointer-events: none; }
.footer-grid { position: relative; display: grid; gap: 2.5rem; }
@media (min-width: 768px) { .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; } }
@media (min-width: 992px) { .footer-grid { grid-template-columns: 1.6fr 1fr 1fr 1fr 1.2fr; gap: 2rem; } }
.footer-brand { display: grid; gap: 1.1rem; align-content: start; max-width: 320px; }
.footer-brand img { height: 40px; width: auto; }
.footer-brand p { font-size: var(--fs-body-sm); color: var(--c-dark-ink-2); margin: 0; }
.footer-col h4 { font-family: var(--ff-mono); font-size: var(--fs-mono); letter-spacing: var(--ls-mono); text-transform: uppercase; color: var(--c-dark-ink-3); margin-bottom: 1rem; font-weight: var(--fw-medium); }
.footer-col ul { display: grid; gap: .1rem; }
.footer-col a { display: inline-flex; align-items: center; min-height: 32px; font-size: var(--fs-body-sm); color: var(--c-dark-ink-2); transition: color var(--dur-fast); }
.footer-col a:hover { color: #fff; }
.footer-contact { display: grid; gap: .6rem; font-size: var(--fs-body-sm); }
.footer-contact a, .footer-contact address { color: var(--c-dark-ink-2); }
.footer-contact a:hover { color: #fff; }
.footer-contact .frow { display: flex; gap: .6rem; align-items: flex-start; }
.footer-contact .frow .icon { width: 16px; height: 16px; margin-top: 4px; color: var(--c-dark-ink-3); flex: none; }
.footer-bottom {
  position: relative;
  display: flex; flex-wrap: wrap; gap: .75rem 1.5rem; align-items: center; justify-content: space-between;
  margin-top: 3.5rem; padding: 1.25rem 0; border-top: 1px solid var(--c-dark-line);
  font-size: var(--fs-caption); color: var(--c-dark-ink-3);
}
.footer-bottom ul { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-bottom a:hover { color: #fff; }
.footer-wordmark {
  position: relative; display: block; width: 100%; height: auto;
  margin-top: 1.5rem; margin-bottom: -2px; user-select: none; pointer-events: none;
}