/* 애니메이션 키프레임 정의 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

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

@keyframes slideInFromTop {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes bounceIn {
    0% {
        transform: scale(0.3);
        opacity: 0;
    }
    50% {
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

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

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

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

@keyframes countUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

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

@keyframes rotateIn {
    from {
        transform: rotate(-180deg) scale(0.5);
        opacity: 0;
    }
    to {
        transform: rotate(0deg) scale(1);
        opacity: 1;
    }
}

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

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

/* 애니메이션 클래스 */
.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out forwards;
}

.animate-fadeInLeft {
    animation: fadeInLeft 0.6s ease-out forwards;
}

.animate-fadeInRight {
    animation: fadeInRight 0.6s ease-out forwards;
}

.animate-fadeIn {
    animation: fadeIn 0.6s ease-out forwards;
}

.animate-slideInFromTop {
    animation: slideInFromTop 0.8s ease-out forwards;
}

.animate-bounceIn {
    animation: bounceIn 0.8s ease-out forwards;
}

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

.animate-float {
    animation: float 3s ease-in-out infinite;
}

.animate-countUp {
    animation: countUp 0.8s ease-out forwards;
}

.animate-slideInFromBottom {
    animation: slideInFromBottom 0.6s ease-out forwards;
}

.animate-rotateIn {
    animation: rotateIn 0.8s ease-out forwards;
}

/* 초기 상태 (애니메이션 시작 전) */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.animate-on-scroll.animate {
    opacity: 1;
    transform: translateY(0);
}

/* 지연 애니메이션 */
.animate-delay-100 {
    animation-delay: 0.1s;
}

.animate-delay-200 {
    animation-delay: 0.2s;
}

.animate-delay-300 {
    animation-delay: 0.3s;
}

.animate-delay-400 {
    animation-delay: 0.4s;
}

.animate-delay-500 {
    animation-delay: 0.5s;
}

/* 스크롤 애니메이션을 위한 초기 상태 */
.scroll-animation {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.scroll-animation.animate {
    opacity: 1;
    transform: translateY(0);
}

/* 특별한 애니메이션 효과들 */
.header {
    animation: slideInFromTop 0.8s ease-out;
}

.hero-content {
    animation: fadeInUp 1.5s ease-out 0.5s both;
}

.hero-title {
    animation: fadeInUp 1.5s ease-out 0.8s both;
}

/* 히어로 비디오 페이드인 */
.hero-video {
    opacity: 0;
    animation: fadeIn 2s ease-out 0.2s both;
}

.video-overlay {
    opacity: 0;
    animation: fadeIn 1s ease-out 0.5s both;
}

/* 작업 아이템 호버 애니메이션 */
.work-item {
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.work-item:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

/* 포트폴리오 아이템 애니메이션 */
.portfolio-item {
    transition: all 0.4s ease;
}

.portfolio-item:hover {
    transform: scale(1.05) rotate(1deg);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

/* 통계 카운터 애니메이션 */
.stat-number {
    opacity: 0;
    transform: translateY(20px);
}

.stat-number.count-up {
    animation: countUp 1s ease-out forwards;
}

/* 상태 아이템 애니메이션 */
.status-item {
    transform: translateX(-50px);
    opacity: 0;
    transition: all 0.6s ease-out;
}

.status-item.animate {
    transform: translateX(0);
    opacity: 1;
}

/* 폼 애니메이션 */
.form-group {
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.6s ease-out;
}

.form-group.animate {
    transform: translateY(0);
    opacity: 1;
}

/* 버튼 애니메이션 */
.btn-more,
.submit-btn,
.download-btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn-more::before,
.submit-btn::before,
.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

.btn-more:hover::before,
.submit-btn:hover::before,
.download-btn:hover::before {
    left: 100%;
}

/* 로딩 애니메이션 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* 모달 애니메이션 */
.modal {
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    transform: scale(0.7) translateY(-50px);
    transition: all 0.3s ease;
}

.modal.show .modal-content {
    transform: scale(1) translateY(0);
}

/* 텍스트 애니메이션 */
.typewriter {
    overflow: hidden;
    border-right: 2px solid #007bff;
    white-space: nowrap;
    animation: typeWriter 3s steps(40, end), blink 0.75s step-end infinite;
}

/* 그라디언트 애니메이션 */
.gradient-animation {
    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 반응형 애니메이션 조정 */
@media (max-width: 768px) {
    .animate-fadeInLeft,
    .animate-fadeInRight {
        animation: fadeInUp 0.6s ease-out forwards;
    }
    
    .work-item:hover {
        transform: translateY(-5px);
    }
    
    .portfolio-item:hover {
        transform: scale(1.02);
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 스크롤 인디케이터 */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(to right, #007bff, #0056b3);
    z-index: 9999;
    transition: width 0.3s ease;
}

/* 커스텀 스크롤바 애니메이션 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(to bottom, #007bff, #0056b3);
    border-radius: 5px;
    transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(to bottom, #0056b3, #004085);
}