/* Enhanced Animations with Performance Optimization */

/* Performance-Optimized Animation Variables */
:root {
    /* Core Animation Timing */
    --anim-micro: 0.1s;      /* Immediate feedback */
    --anim-fast: 0.15s;      /* Button interactions */
    --anim-base: 0.2s;       /* Standard transitions */
    --anim-slow: 0.3s;       /* Complex animations */
    --anim-ultra: 0.5s;      /* Entry animations */
    
    /* Easing Functions - Performance Optimized */
    --ease-instant: linear;
    --ease-snap: cubic-bezier(0.4, 0, 0.6, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --ease-elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* TIER 1: CRITICAL INTERACTIONS (Instant Feedback) */
.btn,
.nav-tab,
.dark-mode-btn,
button[type="submit"],
input[type="button"] {
    transition: background-color var(--anim-fast) var(--ease-snap),
                color var(--anim-fast) var(--ease-snap),
                border-color var(--anim-fast) var(--ease-snap),
                box-shadow var(--anim-micro) var(--ease-instant);
    will-change: background-color, color, border-color;
}

.btn:hover,
.nav-tab:hover,
.dark-mode-btn:hover {
    transition: background-color var(--anim-micro) var(--ease-instant),
                color var(--anim-micro) var(--ease-instant),
                transform var(--anim-fast) var(--ease-snap);
}

/* Enhanced Button Interactions */
.btn:active,
.dark-mode-btn:active {
    transform: scale(0.98);
    transition: transform var(--anim-micro) var(--ease-instant);
}

/* TIER 2: CONTENT TRANSITIONS (Standard Performance) */
.project-card,
.skill-category,
.section,
.container {
    transition: transform var(--anim-base) var(--ease-smooth),
                box-shadow var(--anim-base) var(--ease-smooth),
                background-color var(--anim-base) var(--ease-smooth);
    will-change: transform, box-shadow;
}

.project-card:hover {
    transform: translateY(-8px) scale(1.02);
    transition: transform var(--anim-base) var(--ease-elastic),
                box-shadow var(--anim-base) var(--ease-smooth);
}

/* TIER 3: DECORATIVE ANIMATIONS (Enhanced UX) */
.skill-tag {
    transition: transform var(--anim-slow) var(--ease-bounce),
                background-color var(--anim-base) var(--ease-smooth),
                color var(--anim-base) var(--ease-smooth);
    cursor: pointer;
}

.skill-tag:hover {
    transform: scale(1.1) rotate(2deg);
    transition: transform var(--anim-fast) var(--ease-elastic);
}

.skill-tag:active {
    transform: scale(1.05) rotate(1deg);
    transition: transform var(--anim-micro) var(--ease-instant);
}

/* ENHANCED MICRO-INTERACTIONS */
.nav-tab::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width var(--anim-fast) var(--ease-snap);
}

.nav-tab:hover::before,
.nav-tab.active::before {
    width: 100%;
}

/* Icon Hover Animations */
.section-title i,
.contact-item i,
.footer i {
    transition: transform var(--anim-base) var(--ease-bounce),
                color var(--anim-fast) var(--ease-smooth);
}

.section-title:hover i {
    transform: rotate(10deg) scale(1.1);
}

.contact-item:hover i {
    transform: bounceY(5px) scale(1.2);
    animation: iconPulse var(--anim-slow) var(--ease-bounce);
}

/* PERFORMANCE-OPTIMIZED KEYFRAME ANIMATIONS */
@keyframes iconPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

@keyframes bounceIn {
    0% { 
        transform: scale(0.3) translateY(20px);
        opacity: 0;
    }
    50% { 
        transform: scale(1.05) translateY(-5px);
        opacity: 0.8;
    }
    70% { 
        transform: scale(0.95) translateY(2px);
        opacity: 0.9;
    }
    100% { 
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

/* ENHANCED HOVER STATES */
.profile-image img {
    transition: transform var(--anim-slow) var(--ease-elastic),
                filter var(--anim-base) var(--ease-smooth);
}

.profile-image:hover img {
    transform: scale(1.05) rotate(2deg);
    filter: brightness(1.1) contrast(1.1);
}

/* Interactive Elements Enhancement */
.visitor-counter {
    transition: transform var(--anim-base) var(--ease-bounce);
}

.visitor-counter:hover {
    transform: scale(1.05);
}

#visitor-count {
    transition: color var(--anim-fast) var(--ease-smooth);
}

/* MOBILE-OPTIMIZED ANIMATIONS */
@media (max-width: 768px) {
    :root {
        --anim-fast: 0.1s;
        --anim-base: 0.15s;
        --anim-slow: 0.2s;
        --anim-ultra: 0.3s;
    }
    
    .project-card:hover {
        transform: translateY(-4px) scale(1.01);
    }
    
    .skill-tag:hover {
        transform: scale(1.05) rotate(1deg);
    }
}

/* REDUCED MOTION SUPPORT */
@media (prefers-reduced-motion: reduce) {
    :root {
        --anim-micro: 0s;
        --anim-fast: 0s;
        --anim-base: 0s;
        --anim-slow: 0s;
        --anim-ultra: 0s;
    }
    
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* HIGH CONTRAST MODE */
@media (prefers-contrast: high) {
    .btn,
    .nav-tab {
        border-width: 2px;
    }
    
    .btn:hover,
    .nav-tab:hover {
        border-width: 3px;
    }
}

/* GPU ACCELERATION FOR SMOOTH ANIMATIONS */
.project-card,
.skill-tag,
.btn,
.nav-tab,
.dark-mode-btn,
.profile-image img {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* LOADING STATE ANIMATIONS */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* FOCUS STATES WITH ANIMATION */
.btn:focus-visible,
.nav-tab:focus-visible,
.dark-mode-btn:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    transition: outline-color var(--anim-fast) var(--ease-smooth),
                box-shadow var(--anim-fast) var(--ease-smooth);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.dark-mode .btn:focus-visible,
.dark-mode .nav-tab:focus-visible,
.dark-mode .dark-mode-btn:focus-visible {
    outline-color: var(--theme-accent);
    box-shadow: 0 0 0 4px rgba(180, 190, 254, 0.2);
}