/**
 * animations.css - 애니메이션 효과
 * ANTIGRAVITY Effects: Celestial Dance, Bubble Rise, Fade In
 */

/* ============================================
   Base Animation Utilities
   ============================================ */
.animate-fade-in {
    animation: fadeIn 0.5s ease forwards;
}

.animate-slide-up {
    animation: slideUp 0.5s ease forwards;
}

.animate-slide-down {
    animation: slideDown 0.5s ease forwards;
}

.animate-scale-in {
    animation: scaleIn 0.3s ease forwards;
}

.animate-bounce {
    animation: bounce 0.6s ease;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

.animate-shake {
    animation: shake 0.5s ease;
}

.animate-spin {
    animation: spin 1s linear infinite;
}

/* ============================================
   Keyframe Definitions
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

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

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

@keyframes slideRight {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes scaleOut {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0.8);
    }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* ============================================
   ANTIGRAVITY: Celestial Dance
   천체의 춤 - 우주적 회전 애니메이션
   ============================================ */
.celestial-dance {
    animation: celestialDance 20s ease-in-out infinite;
}

@keyframes celestialDance {
    0% {
        transform: rotate(0deg) translateX(0) rotate(0deg);
    }
    25% {
        transform: rotate(90deg) translateX(20px) rotate(-90deg);
    }
    50% {
        transform: rotate(180deg) translateX(0) rotate(-180deg);
    }
    75% {
        transform: rotate(270deg) translateX(-20px) rotate(-270deg);
    }
    100% {
        transform: rotate(360deg) translateX(0) rotate(-360deg);
    }
}

/* Celestial Orbit Effect */
.celestial-orbit {
    position: relative;
}

.celestial-orbit::before,
.celestial-orbit::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    animation: orbit 8s linear infinite;
}

.celestial-orbit::after {
    animation-delay: -4s;
    background: var(--primary);
}

@keyframes orbit {
    from {
        transform: rotate(0deg) translateX(60px) rotate(0deg);
    }
    to {
        transform: rotate(360deg) translateX(60px) rotate(-360deg);
    }
}

/* ============================================
   ANTIGRAVITY: Bubble Rise
   거품 상승 - 떠오르는 거품 효과
   ============================================ */
.bubble-container {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: -1;
}

.bubble {
    position: absolute;
    bottom: -100px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%,
        rgba(255, 255, 255, 0.4),
        rgba(102, 126, 234, 0.1));
    animation: bubbleRise linear infinite;
}

@keyframes bubbleRise {
    0% {
        transform: translateY(0) scale(1);
        opacity: 0.8;
    }
    50% {
        opacity: 0.6;
    }
    100% {
        transform: translateY(-120vh) scale(0.5);
        opacity: 0;
    }
}

/* Bubble variations */
.bubble:nth-child(1) {
    width: 40px;
    height: 40px;
    left: 10%;
    animation-duration: 15s;
    animation-delay: 0s;
}

.bubble:nth-child(2) {
    width: 25px;
    height: 25px;
    left: 20%;
    animation-duration: 12s;
    animation-delay: 2s;
}

.bubble:nth-child(3) {
    width: 50px;
    height: 50px;
    left: 35%;
    animation-duration: 18s;
    animation-delay: 4s;
}

.bubble:nth-child(4) {
    width: 30px;
    height: 30px;
    left: 50%;
    animation-duration: 14s;
    animation-delay: 1s;
}

.bubble:nth-child(5) {
    width: 35px;
    height: 35px;
    left: 65%;
    animation-duration: 16s;
    animation-delay: 3s;
}

.bubble:nth-child(6) {
    width: 20px;
    height: 20px;
    left: 80%;
    animation-duration: 13s;
    animation-delay: 5s;
}

.bubble:nth-child(7) {
    width: 45px;
    height: 45px;
    left: 90%;
    animation-duration: 17s;
    animation-delay: 2.5s;
}

/* ============================================
   ANTIGRAVITY: Fade In (with variants)
   페이드 인 - 점진적 등장 효과
   ============================================ */
.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    animation: fadeInUp 0.6s ease forwards;
}

.fade-in-down {
    opacity: 0;
    transform: translateY(-40px);
    animation: fadeInDown 0.6s ease forwards;
}

.fade-in-left {
    opacity: 0;
    transform: translateX(40px);
    animation: fadeInLeft 0.6s ease forwards;
}

.fade-in-right {
    opacity: 0;
    transform: translateX(-40px);
    animation: fadeInRight 0.6s ease forwards;
}

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

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

@keyframes fadeInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Staggered fade-in for lists */
.stagger-fade-in > * {
    opacity: 0;
    animation: fadeInUp 0.5s ease forwards;
}

.stagger-fade-in > *:nth-child(1) { animation-delay: 0.1s; }
.stagger-fade-in > *:nth-child(2) { animation-delay: 0.2s; }
.stagger-fade-in > *:nth-child(3) { animation-delay: 0.3s; }
.stagger-fade-in > *:nth-child(4) { animation-delay: 0.4s; }
.stagger-fade-in > *:nth-child(5) { animation-delay: 0.5s; }
.stagger-fade-in > *:nth-child(6) { animation-delay: 0.6s; }
.stagger-fade-in > *:nth-child(7) { animation-delay: 0.7s; }
.stagger-fade-in > *:nth-child(8) { animation-delay: 0.8s; }
.stagger-fade-in > *:nth-child(9) { animation-delay: 0.9s; }
.stagger-fade-in > *:nth-child(10) { animation-delay: 1s; }

/* ============================================
   Game-Specific Animations
   ============================================ */

/* Letter tile animations */
@keyframes letterPop {
    0% { transform: scale(0) rotate(-10deg); }
    60% { transform: scale(1.15) rotate(5deg); }
    100% { transform: scale(1) rotate(0deg); }
}

@keyframes letterSelect {
    0% { transform: scale(1); }
    50% { transform: scale(0.9); }
    100% { transform: scale(1) translateY(-8px); }
}

@keyframes letterDeselect {
    0% { transform: scale(1) translateY(-8px); }
    100% { transform: scale(1) translateY(0); }
}

@keyframes letterCorrect {
    0% { transform: scale(1); background: var(--game-success); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

@keyframes letterWrong {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-8px); }
    40%, 80% { transform: translateX(8px); }
}

@keyframes letterShuffle {
    0% { transform: rotate(0deg) scale(1); }
    25% { transform: rotate(-15deg) scale(0.9); }
    50% { transform: rotate(0deg) scale(1); }
    75% { transform: rotate(15deg) scale(0.9); }
    100% { transform: rotate(0deg) scale(1); }
}

/* Score animations */
@keyframes scorePopup {
    0% {
        opacity: 0;
        transform: translateY(0) scale(0.5);
    }
    50% {
        opacity: 1;
        transform: translateY(-30px) scale(1.2);
    }
    100% {
        opacity: 0;
        transform: translateY(-60px) scale(0.8);
    }
}

@keyframes scoreIncrease {
    0% { transform: scale(1); }
    50% { transform: scale(1.3); color: var(--game-gold); }
    100% { transform: scale(1); }
}

/* Streak fire effect */
@keyframes streakFire {
    0%, 100% {
        text-shadow:
            0 0 4px #ff8800,
            0 0 8px #ff6600,
            0 0 12px #ff4400;
        transform: scale(1);
    }
    50% {
        text-shadow:
            0 0 8px #ffaa00,
            0 0 16px #ff8800,
            0 0 24px #ff6600;
        transform: scale(1.1);
    }
}

/* Timer warning pulse */
@keyframes timerWarning {
    0%, 100% {
        background: var(--game-warning);
        transform: scale(1);
    }
    50% {
        background: var(--game-warning-light);
        transform: scale(1.05);
    }
}

@keyframes timerDanger {
    0%, 100% {
        background: var(--game-error);
        transform: scale(1);
    }
    50% {
        background: var(--game-error-light);
        transform: scale(1.1);
    }
}

/* Level up celebration */
@keyframes levelUp {
    0% {
        transform: scale(0) rotate(-180deg);
        opacity: 0;
    }
    50% {
        transform: scale(1.2) rotate(10deg);
        opacity: 1;
    }
    100% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
}

/* Confetti effect */
@keyframes confettiFall {
    0% {
        transform: translateY(-100%) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    top: -10px;
    animation: confettiFall 3s ease-out forwards;
    z-index: var(--z-toast);
}

.confetti:nth-child(odd) {
    border-radius: 50%;
}

.confetti:nth-child(even) {
    border-radius: 2px;
}

/* ============================================
   Hover & Interactive Effects
   ============================================ */
.hover-lift {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.hover-glow {
    transition: box-shadow var(--transition-base);
}

.hover-glow:hover {
    box-shadow: var(--shadow-glow);
}

.hover-scale {
    transition: transform var(--transition-base);
}

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

/* Ripple effect */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, rgba(255,255,255,0.3) 10%, transparent 10%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10);
    opacity: 0;
    transition: transform 0.5s, opacity 0.5s;
}

.ripple:active::after {
    transform: scale(0);
    opacity: 1;
    transition: 0s;
}

/* Glow pulse */
@keyframes glowPulse {
    0%, 100% {
        box-shadow: 0 0 5px var(--primary), 0 0 10px var(--primary);
    }
    50% {
        box-shadow: 0 0 20px var(--primary), 0 0 30px var(--primary);
    }
}

.glow-pulse {
    animation: glowPulse 2s ease-in-out infinite;
}

/* ============================================
   Loading States
   ============================================ */
.skeleton {
    background: linear-gradient(90deg,
        var(--bg-tertiary) 0%,
        var(--bg-secondary) 50%,
        var(--bg-tertiary) 100%);
    background-size: 200% 100%;
    animation: skeleton 1.5s ease-in-out infinite;
}

@keyframes skeleton {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.loading-dots::after {
    content: '';
    animation: loadingDots 1.5s infinite;
}

@keyframes loadingDots {
    0% { content: ''; }
    25% { content: '.'; }
    50% { content: '..'; }
    75% { content: '...'; }
}

/* ============================================
   Cosmic Background Effects
   ============================================ */
.cosmic-bg {
    position: relative;
    overflow: hidden;
}

.cosmic-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(118, 75, 162, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 40% 80%, rgba(240, 147, 251, 0.1) 0%, transparent 40%);
    animation: cosmicShift 30s ease-in-out infinite;
    pointer-events: none;
}

@keyframes cosmicShift {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(-5%, -5%) rotate(5deg); }
    50% { transform: translate(-10%, 0) rotate(0deg); }
    75% { transform: translate(-5%, 5%) rotate(-5deg); }
}

/* Star twinkle effect */
.star {
    position: absolute;
    width: 4px;
    height: 4px;
    background: white;
    border-radius: 50%;
    animation: twinkle 3s ease-in-out infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.5); }
}

/* ============================================
   Text Effects
   ============================================ */
.gradient-text {
    background: var(--gradient-cosmic);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-shimmer {
    background: linear-gradient(
        90deg,
        var(--text-primary) 0%,
        var(--primary) 50%,
        var(--text-primary) 100%
    );
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
    to { background-position: 200% center; }
}

/* Typewriter effect */
.typewriter {
    overflow: hidden;
    border-right: 2px solid var(--primary);
    white-space: nowrap;
    animation:
        typing 3s steps(40, end),
        blinkCursor 0.75s step-end infinite;
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes blinkCursor {
    from, to { border-color: transparent; }
    50% { border-color: var(--primary); }
}

/* ============================================
   Page Transition Effects
   ============================================ */
.page-enter {
    opacity: 0;
    transform: translateY(20px);
}

.page-enter-active {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.page-exit {
    opacity: 1;
}

.page-exit-active {
    opacity: 0;
    transition: opacity 0.3s ease;
}