/* ============================================
   GLOBAL RESET & BASE STYLES
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-ui);
  background-color: var(--bg-base);
  color: var(--txt-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-surface); }
::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--clr-primary); }

/* Selection */
::selection {
  background: hsla(258, 90%, 66%, 0.3);
  color: var(--txt-primary);
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
#main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: hsla(230, 22%, 7%, 0.85);
  border-bottom: 1px solid var(--border-glass);
  transition: box-shadow var(--dur-normal) var(--ease-out),
              background var(--dur-normal) var(--ease-out);
}
#main-header.scrolled {
  box-shadow: var(--shadow-md);
  background: hsla(230, 22%, 7%, 0.95);
}

.nav-container {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
  transition: opacity var(--dur-fast) var(--ease-out);
  flex-shrink: 0;
}
.nav-logo:hover { opacity: 0.85; }
.logo-icon {
  font-size: 1.1rem;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 8px hsla(258, 90%, 66%, 0.5));
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.nav-link {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--txt-secondary);
  white-space: nowrap; /* Kesinlikle alt alta yazma */
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.nav-link:hover, .nav-link.active {
  color: var(--txt-primary);
  background: hsla(220, 20%, 50%, 0.12);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 20px; 
}

/* Mobile Menu */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  margin-left: auto;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--txt-secondary);
  border-radius: 2px;
  transition: all var(--dur-normal) var(--ease-out);
}
.mobile-menu-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.mobile-menu-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: var(--space-4) var(--space-6) var(--space-8);
  border-top: 1px solid var(--border-glass);
  background: hsla(230, 22%, 8%, 0.98);
  gap: var(--space-1);
  overflow-y: auto;
  max-height: 0;
  transition: max-height var(--dur-slow) var(--ease-out),
              padding var(--dur-slow) var(--ease-out);
}
.mobile-menu.open {
  max-height: 80vh; /* Ekranın %80'ine kadar uzayabilir */
  display: flex;
}
.mobile-nav-link {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  color: var(--txt-secondary);
  font-weight: 500;
  transition: all var(--dur-fast);
}
.mobile-nav-link:hover { 
  color: var(--txt-primary); 
  background: hsla(220,20%,50%,0.1); 
}

#mobile-auth-area {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-glass);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* ============================================
   MAIN LAYOUT
   ============================================ */
#view-container {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

.container {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section-padding { padding: var(--space-16) 0; }

/* ============================================
   FOOTER
   ============================================ */
#main-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-glass);
  margin-top: var(--space-20);
}
.footer-container {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: var(--space-16) var(--space-6);
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-16);
}
.footer-brand .logo-text { font-size: 1.1rem; font-weight: 700; }
.footer-brand p {
  color: var(--txt-muted);
  margin-top: var(--space-4);
  font-size: 0.9rem;
  max-width: 240px;
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}
.footer-col { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col h4 {
  color: var(--txt-primary);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--space-2);
}
.footer-col a {
  color: var(--txt-muted);
  font-size: 0.875rem;
  transition: color var(--dur-fast);
}
.footer-col a:hover { color: var(--clr-primary-light); }
.footer-bottom {
  border-top: 1px solid var(--border-glass);
  padding: var(--space-5) var(--space-6);
  text-align: center;
}
.footer-bottom p { color: var(--txt-muted); font-size: 0.8rem; }

/* ============================================
   INITIAL LOADER
   ============================================ */
.initial-loader {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--nav-height));
}
.loader-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--clr-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
#toast-container {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}
.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 500;
  max-width: 360px;
  pointer-events: all;
  backdrop-filter: blur(12px);
  animation: slideInRight var(--dur-slow) var(--ease-out) forwards;
  transition: opacity var(--dur-normal), transform var(--dur-normal);
}
.toast.hiding { animation: slideOutRight var(--dur-normal) var(--ease-in) forwards; }
.toast-icon { font-size: 1.1rem; flex-shrink: 0; }
.toast.success { border-color: hsla(142, 70%, 50%, 0.4); }
.toast.success .toast-icon { color: var(--clr-success); }
.toast.error   { border-color: hsla(4, 90%, 60%, 0.4); }
.toast.error   .toast-icon { color: var(--clr-error); }
.toast.info    { border-color: hsla(210, 90%, 60%, 0.4); }
.toast.info    .toast-icon { color: var(--clr-info); }

/* ============================================
   CATEGORY BADGES
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px var(--space-3);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.badge-tech      { background: hsla(192,95%,55%,0.15); color: var(--cat-tech); }
.badge-science   { background: hsla(142,70%,52%,0.15); color: var(--cat-science); }
.badge-art       { background: hsla(300,80%,65%,0.15); color: var(--cat-art); }
.badge-lifestyle { background: hsla(30,100%,62%,0.15); color: var(--cat-lifestyle); }
.badge-business  { background: hsla(220,90%,65%,0.15); color: var(--cat-business); }
.badge-default   { background: hsla(258,90%,66%,0.15); color: var(--clr-primary-light); }

/* ============================================
   UTILITY CLASSES
   ============================================ */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.text-gradient {
  background: linear-gradient(135deg, var(--clr-primary-light), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.divider {
  height: 1px;
  background: var(--border-glass);
  margin: var(--space-8) 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-actions { display: none; }
  .mobile-menu-btn { display: flex; }
  .footer-container { grid-template-columns: 1fr; gap: var(--space-8); }
  #toast-container { bottom: var(--space-4); right: var(--space-4); left: var(--space-4); }
  .toast { max-width: 100%; }
}