/* ============================================================
   SERVET İNŞAAT — animations.css
   ============================================================ */

/* ---------- Scroll-reveal fade-up ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.75s ease, transform 0.75s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ---------- Scroll-down bounce ---------- */
@keyframes bounce-down {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50%       { transform: translateY(10px); opacity: 1; }
}
.scroll-indicator {
  animation: bounce-down 1.8s ease-in-out infinite;
}

/* ---------- Hamburger lines ---------- */
@keyframes line-top-open {
  0%   { transform: translateY(0) rotate(0); }
  50%  { transform: translateY(8px) rotate(0); }
  100% { transform: translateY(8px) rotate(45deg); }
}
@keyframes line-mid-open {
  0%   { opacity: 1; transform: scaleX(1); }
  100% { opacity: 0; transform: scaleX(0); }
}
@keyframes line-bot-open {
  0%   { transform: translateY(0) rotate(0); }
  50%  { transform: translateY(-8px) rotate(0); }
  100% { transform: translateY(-8px) rotate(-45deg); }
}
@keyframes line-top-close {
  0%   { transform: translateY(8px) rotate(45deg); }
  50%  { transform: translateY(8px) rotate(0); }
  100% { transform: translateY(0) rotate(0); }
}
@keyframes line-mid-close {
  0%   { opacity: 0; transform: scaleX(0); }
  100% { opacity: 1; transform: scaleX(1); }
}
@keyframes line-bot-close {
  0%   { transform: translateY(-8px) rotate(-45deg); }
  50%  { transform: translateY(-8px) rotate(0); }
  100% { transform: translateY(0) rotate(0); }
}

/* ---------- Tab fade ---------- */
@keyframes tab-fade-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.tab-content.active {
  animation: tab-fade-in 0.45s ease forwards;
}

/* ---------- Gold underline hover ---------- */
.nav-link-underline {
  position: relative;
  display: inline-block;
}
.nav-link-underline::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 0; height: 1px;
  background: #C9A84C;
  transition: width 0.3s ease;
}
.nav-link-underline:hover::after { width: 100%; }

/* ---------- Button pulse (arrow circles) ---------- */
@keyframes ring-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(201,168,76,0.35); }
  70%  { box-shadow: 0 0 0 10px rgba(201,168,76,0); }
  100% { box-shadow: 0 0 0 0 rgba(201,168,76,0); }
}
.btn-circle:hover {
  animation: ring-pulse 1s ease-out;
}

/* ---------- Overlay backdrop ---------- */
.menu-overlay {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}
.menu-overlay.open {
  opacity: 1;
  visibility: visible;
}

/* ---------- Slide panel ---------- */
.slide-panel {
  transform: translateX(-100%);
  transition: transform 0.45s cubic-bezier(0.77, 0, 0.175, 1);
}
.slide-panel.open {
  transform: translateX(0);
}