/* Custom variables for theme matching */
:root {
  --color-bg-dark: #0f1012;
  --color-bg-card: #16171a;
  --color-accent-orange: #ff5a00;
  --color-text-white: #ffffff;
  --color-text-gray: #9ca3af;
}

/* Base resets & behavior */
html {
  scroll-behavior: smooth;
  background-color: var(--color-bg-dark);
  color: var(--color-text-white);
  font-family: 'Inter', sans-serif;
  overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-dark);
}

::-webkit-scrollbar-thumb {
  background: #27272a;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-orange);
}

/* Active Nav Indicator and Hover Styles */
.nav-link {
  position: relative;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-orange);
  transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link:hover {
  color: var(--color-text-white) !important;
}

/* Custom Sticky Header transitions */
header {
  transition: background-color 0.3s ease, padding 0.3s ease, box-shadow 0.3s ease;
}

header.sticky {
  background-color: rgba(15, 16, 18, 0.9);
  backdrop-filter: blur(12px);
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* Animations for Intersection Observer */
.reveal-fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-fade-in.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animation delays */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }

/* Filter button active styles */
.filter-btn {
  position: relative;
  transition: all 0.3s ease;
}

.filter-btn::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-orange);
  transition: width 0.3s ease;
}

.filter-btn.active::after {
  width: 100%;
}

/* Micro-interaction on Cards */
.project-card {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
}

.project-card img {
  transition: transform 0.5s ease;
}

.project-card:hover img {
  transform: scale(1.03);
}

/* Mobile Navigation Overlay */
#mobile-menu {
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

#mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}