/* ============================================
   COMPONENTS — Ahmed Elkelany Portfolio
   Buttons, cards, modals, glass, navigation
   ============================================ */

/* ---- GLASS CARD ---- */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.glass-card:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  box-shadow: 0 8px 32px var(--glow-primary);
  transform: translateY(-2px);
}

.glass-card-strong {
  background: var(--bg-glass-strong);
  backdrop-filter: blur(var(--glass-blur-heavy));
  -webkit-backdrop-filter: blur(var(--glass-blur-heavy));
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
}

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  line-height: 1;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::before {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #fff;
  box-shadow: 0 4px 15px var(--accent-primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--accent-primary-glow);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-glass);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
}

.btn-secondary:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
  color: var(--text-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-3);
}

.btn-ghost:hover {
  color: var(--accent-primary);
  background: var(--glow-primary);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
}

.btn-icon:hover {
  color: var(--accent-primary);
  border-color: var(--border-accent);
  background: var(--bg-glass-hover);
  transform: translateY(-2px);
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ---- FLOATING NAV ---- */
.floating-nav {
  position: fixed;
  top: var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-nav);
  background: var(--bg-glass-strong);
  backdrop-filter: blur(var(--glass-blur-heavy));
  -webkit-backdrop-filter: blur(var(--glass-blur-heavy));
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-1);
  transition: all var(--transition-base);
  opacity: 0;
  pointer-events: none;
}

.floating-nav.visible {
  opacity: 1;
  pointer-events: all;
}

.floating-nav.nav-hidden {
  transform: translateX(-50%) translateY(-120%);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-sans);
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--glow-primary);
}

.nav-link.active {
  color: var(--accent-primary);
  background: var(--accent-primary-glow);
}

.nav-theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  margin-left: var(--space-2);
  flex-shrink: 0;
}

.nav-theme-toggle:hover {
  color: var(--accent-warning);
  border-color: var(--border-hover);
  background: var(--bg-glass-hover);
}

.nav-theme-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-base);
}

.nav-theme-toggle:hover svg {
  transform: rotate(15deg);
}

.nav-divider {
  width: 1px;
  height: 20px;
  background: var(--border-primary);
  margin: 0 var(--space-1);
  flex-shrink: 0;
}

/* ---- MOBILE NAV ---- */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-nav);
  background: var(--bg-glass-strong);
  backdrop-filter: blur(var(--glass-blur-heavy));
  -webkit-backdrop-filter: blur(var(--glass-blur-heavy));
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-2) var(--space-4);
  align-items: center;
  gap: var(--space-1);
  box-shadow: var(--shadow-lg);
}

.mobile-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: var(--space-2) var(--space-3);
  border: none;
  background: none;
  color: var(--text-tertiary);
  font-size: 10px;
  font-weight: var(--weight-medium);
  font-family: var(--font-sans);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  min-width: 44px;
  min-height: 44px;
}

.mobile-nav-btn svg {
  width: 20px;
  height: 20px;
}

.mobile-nav-btn.active {
  color: var(--accent-primary);
  background: var(--accent-primary-glow);
}

.mobile-nav-btn:hover {
  color: var(--text-primary);
}

/* Mobile expanded menu */
.mobile-menu-overlay {
  display: none;
  pointer-events: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-nav) - 1);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.mobile-menu-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu-sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background: var(--bg-glass-strong);
  backdrop-filter: blur(var(--glass-blur-heavy));
  -webkit-backdrop-filter: blur(var(--glass-blur-heavy));
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: var(--space-6) var(--space-6) var(--space-10);
  transform: translateY(100%);
  transition: transform var(--transition-slow);
  display: none;
}

.mobile-menu-sheet.open {
  transform: translateY(0);
}

.mobile-menu-sheet .nav-link {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--space-4) var(--space-4);
  font-size: var(--text-base);
  border-radius: var(--radius-md);
}

.mobile-menu-handle {
  width: 40px;
  height: 4px;
  background: var(--border-hover);
  border-radius: var(--radius-full);
  margin: 0 auto var(--space-6);
}

/* ---- MODAL ---- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  z-index: var(--z-modal);
  background: var(--bg-glass-strong);
  backdrop-filter: blur(var(--glass-blur-heavy));
  -webkit-backdrop-filter: blur(var(--glass-blur-heavy));
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 720px;
  max-height: 85vh;
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-slow);
}

.modal.open {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  z-index: 10;
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal-body {
  padding: var(--space-8);
}

/* ---- TAGS ---- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--accent-primary);
  background: var(--accent-primary-glow);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tag-secondary {
  color: var(--accent-secondary);
  background: var(--accent-secondary-glow);
  border-color: rgba(6, 182, 212, 0.2);
}

.tag-tertiary {
  color: var(--accent-tertiary);
  background: var(--accent-tertiary-glow);
  border-color: rgba(139, 92, 246, 0.2);
}

.tag-neutral {
  color: var(--text-secondary);
  background: var(--bg-glass);
  border-color: var(--border-primary);
}

/* ---- SKILL CHIP ---- */
.skill-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-primary);
  background: var(--bg-glass);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.skill-chip:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-accent);
  box-shadow: 0 2px 12px var(--glow-primary);
  transform: translateY(-1px);
}

.skill-chip .skill-level {
  font-size: var(--text-xs);
  color: var(--accent-primary);
  font-weight: var(--weight-regular);
  opacity: 0.8;
}

/* ---- DIVIDER ---- */
.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-full);
  margin: var(--space-4) auto 0;
}

/* ---- ENTRY TRANSITION ---- */
.entry-screen {
  position: fixed;
  inset: 0;
  z-index: var(--z-entry);
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-4);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.entry-screen.done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.entry-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-color-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color-strong) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0;
  animation: entry-grid-fade 0.6s ease forwards;
}

.entry-text {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--accent-primary);
  letter-spacing: 0.2em;
  z-index: 1;
  opacity: 0;
  animation: entry-text-fade 0.4s ease 0.3s forwards;
}

.entry-line {
  width: 120px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
  z-index: 1;
  opacity: 0;
  animation: entry-line-fade 0.4s ease 0.5s forwards;
}

@keyframes entry-grid-fade {
  to { opacity: 1; }
}

@keyframes entry-text-fade {
  to { opacity: 1; }
}

@keyframes entry-line-fade {
  0% { opacity: 0; width: 0; }
  100% { opacity: 1; width: 120px; }
}