/* ===========================================
   Components - Cards, Nav, Timeline, Buttons
   =========================================== */

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  z-index: var(--z-fixed);
  display: flex;
  gap: var(--space-1);
  transition: border-color var(--transition-base);
}

.nav-link {
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}

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

.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent-primary);
  border-radius: var(--radius-full);
}

/* ===== Cards ===== */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  position: relative;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-tertiary);
  color: var(--accent-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.card-description {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* ===== Project Cards ===== */
.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.project-image {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg-tertiary);
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 15, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-content {
  padding: var(--space-5);
}

.project-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.project-description {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
  line-height: var(--leading-relaxed);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.project-tech li {
  font-size: var(--text-xs);
  color: var(--accent-primary);
  background: var(--bg-tertiary);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

.project-links {
  display: flex;
  gap: var(--space-4);
}

.project-links a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.project-links a:hover {
  color: var(--accent-primary);
}

.project-links svg {
  width: 16px;
  height: 16px;
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent-primary);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-10);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-8) - 5px);
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-primary);
  transition: background var(--transition-base), transform var(--transition-base);
  z-index: 1;
}

.timeline-item:hover::before {
  background: var(--accent-primary);
  transform: scale(1.3);
}

.timeline-date {
  font-size: var(--text-sm);
  color: var(--accent-primary);
  font-family: var(--font-mono);
  margin-bottom: var(--space-2);
}

.timeline-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}

.timeline-company {
  color: var(--text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-3);
}

.timeline-description {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-weight: 500;
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-primary {
  background: var(--accent-primary);
  color: var(--bg-primary);
}

.btn-primary:hover {
  filter: brightness(0.95);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

/* ===== Social Links ===== */
.social-links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.social-link:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.social-link svg {
  width: 18px;
  height: 18px;
}

/* ===== Scroll Indicator ===== */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-muted);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: var(--accent-primary);
  opacity: 0.6;
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% {
    opacity: 0.3;
    transform: scaleY(1);
  }
  50% {
    opacity: 1;
    transform: scaleY(1.2);
  }
}

/* ===== Footer ===== */
.footer {
  padding: var(--space-12) 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer-text {
  color: var(--text-muted);
  font-size: var(--text-sm);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.footer-links a {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-primary);
}

/* ===== Interaction Hint ===== */
.interaction-hint {
  position: absolute;
  bottom: var(--space-8);
  right: var(--space-8);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  opacity: 0; /* Start hidden */
  pointer-events: none; /* Let clicks pass through to background */
  animation: fadeIn 2s ease 2s forwards; /* Fade in after 2 seconds */
  z-index: 10;
}

.interaction-hint svg {
  width: 14px;
  height: 14px;
  opacity: 0.7;
}

/* Hide hint on small mobile screens to avoid clutter */
@media (max-width: 640px) {
  .interaction-hint {
    display: none;
  }
}