/**
 * Page Transitions & Animations
 * Creates fluid, smooth transitions for a super soft flow
 */

/* =============================================================================
   SMOOTH SCROLLING
   ============================================================================= */

html {
    scroll-behavior: smooth;
}

/* Disable smooth scroll when user prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

/* =============================================================================
   PAGE TRANSITIONS (Fallback for all browsers)
   ============================================================================= */

body {
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Page loaded - fade in */
body.page-loaded {
    opacity: 1;
}

/* Page transitioning out - fade out */
body.page-transitioning-out {
    opacity: 0;
}

/* =============================================================================
   VIEW TRANSITIONS API (Modern Browsers)
   ============================================================================= */

/* Root transition for page navigation */
::view-transition-old(root) {
    animation: fadeOut 0.3s cubic-bezier(0.4, 0, 1, 1);
}

::view-transition-new(root) {
    animation: fadeIn 0.4s cubic-bezier(0, 0, 0.2, 1);
}

/* =============================================================================
   HERO ANIMATIONS
   ============================================================================= */

/* Hero elements start invisible */
.hero-animate {
    opacity: 0;
    transform: translateY(30px);
    animation: heroFadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes heroFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Split hero sides */
.hero-side {
    opacity: 0;
    animation: splitHeroFadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes splitHeroFadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* =============================================================================
   SCROLL ANIMATIONS
   ============================================================================= */

/* Elements ready to animate */
.animate-ready {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Elements animate in when visible */
.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animations for grid items */
.projects-grid .animate-ready,
.games-grid .animate-ready,
.skills-grid .animate-ready,
.tech-grid .animate-ready {
    transition-delay: calc(var(--animation-order, 0) * 0.1s);
}

/* Set animation order based on position */
.project-card:nth-child(1),
.game-card:nth-child(1),
.skill-card:nth-child(1) {
    --animation-order: 1;
}

.project-card:nth-child(2),
.game-card:nth-child(2),
.skill-card:nth-child(2) {
    --animation-order: 2;
}

.project-card:nth-child(3),
.game-card:nth-child(3),
.skill-card:nth-child(3) {
    --animation-order: 3;
}

.project-card:nth-child(4),
.game-card:nth-child(4),
.skill-card:nth-child(4) {
    --animation-order: 4;
}

.project-card:nth-child(5),
.game-card:nth-child(5),
.skill-card:nth-child(5) {
    --animation-order: 5;
}

.project-card:nth-child(6),
.game-card:nth-child(6),
.skill-card:nth-child(6) {
    --animation-order: 6;
}

/* =============================================================================
   HOVER TRANSITIONS
   ============================================================================= */

/* Smooth all hover effects */
a,
button,
.btn,
.project-card,
.game-card,
.skill-card,
.tech-card,
.filter-btn,
.hero-side {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Image hover effects */
.project-image img,
.game-image img {
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =============================================================================
   NAVIGATION TRANSITIONS
   ============================================================================= */

/* Header on scroll */
.header {
    transition: background-color 0.3s ease,
                box-shadow 0.3s ease,
                padding 0.3s ease;
}

/* Mobile menu */
.nav-menu {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.3s ease;
}

.nav-menu.active {
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.3s ease;
}

/* =============================================================================
   FILTER TRANSITIONS
   ============================================================================= */

/* Filter buttons */
.filter-btn {
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.filter-btn:hover {
    transform: translateY(-2px);
}

.filter-btn.active {
    transform: scale(1.05);
}

/* Projects filtering */
.project-card,
.game-card {
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.4s;
}

.project-card.hidden,
.game-card.hidden {
    opacity: 0;
    transform: scale(0.9);
    visibility: hidden;
}

/* =============================================================================
   SECTION TRANSITIONS
   ============================================================================= */

/* Section headers fade in */
.section-header {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.section-header.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* =============================================================================
   FORM TRANSITIONS
   ============================================================================= */

/* Form inputs */
.form-input,
.form-textarea {
    transition: border-color 0.3s ease,
                box-shadow 0.3s ease,
                transform 0.2s ease;
}

.form-input:focus,
.form-textarea:focus {
    transform: translateY(-2px);
}

/* =============================================================================
   BUTTON TRANSITIONS
   ============================================================================= */

/* All buttons */
.btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

/* Button hover effect */
.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

/* =============================================================================
   LOADING STATES
   ============================================================================= */

/* Skeleton loading animation */
@keyframes skeleton-loading {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

.skeleton {
    animation: skeleton-loading 1.5s ease-in-out infinite;
    background: linear-gradient(
        90deg,
        #f0f0f0 0px,
        #e0e0e0 40px,
        #f0f0f0 80px
    );
    background-size: 200px 100%;
}

/* =============================================================================
   PAGE-SPECIFIC ANIMATIONS
   ============================================================================= */

/* About section */
.about-section .section-title {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}

.about-text {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.4s forwards;
}

.about-cta {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.6s forwards;
}

/* Contact section */
.contact-section .section-title {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}

.contact-text {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.3s forwards;
}

.contact-form {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.4s forwards;
}

/* =============================================================================
   KEYFRAME ANIMATIONS
   ============================================================================= */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }
    to {
        opacity: 0;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* =============================================================================
   REDUCED MOTION
   ============================================================================= */

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    body {
        opacity: 1;
    }
    
    .hero-animate,
    .animate-ready {
        opacity: 1;
        transform: none;
    }
}

/* =============================================================================
   MOBILE OPTIMIZATIONS
   ============================================================================= */

@media (max-width: 768px) {
    /* Faster animations on mobile */
    body {
        transition-duration: 0.3s;
    }
    
    .animate-ready {
        transition-duration: 0.4s;
    }
    
    /* Reduce stagger delay on mobile */
    .projects-grid .animate-ready,
    .games-grid .animate-ready,
    .skills-grid .animate-ready {
        transition-delay: calc(var(--animation-order, 0) * 0.05s);
    }
}

/* =============================================================================
   PERFORMANCE OPTIMIZATIONS
   ============================================================================= */

/* Use GPU acceleration for transforms */
.hero-side,
.project-card,
.game-card,
.animate-ready,
.btn {
    will-change: transform, opacity;
}

/* Remove will-change after animation */
.animate-in {
    will-change: auto;
}

/* =============================================================================
   ACCESSIBILITY
   ============================================================================= */

/* Focus indicators with smooth transitions */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 4px;
    transition: outline-offset 0.2s ease;
}

/* =============================================================================
   CUSTOM EASINGS
   ============================================================================= */

:root {
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-cubic: cubic-bezier(0.33, 1, 0.68, 1);
    --ease-in-out-cubic: cubic-bezier(0.65, 0, 0.35, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}