/* 부드러운 페이지 로딩 효과 */

/* 초기 상태 */
body {
    opacity: 0;
    transition: opacity 0.5s ease;
}

body.loaded {
    opacity: 1;
}

/* 페이지 전환 효과 */
body.page-transition {
    opacity: 0;
    transform: scale(0.98);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* 히어로 섹션 애니메이션 */
.hero-section, .hero-modern {
    animation: heroSlideIn 1s ease forwards;
}

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

/* 카드 호버 효과 개선 */
.course-card, .stat-card, .content-card {
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.course-card:hover, .stat-card:hover, .content-card:hover {
    transform: translateY(-8px) scale(1.02);
}

/* 버튼 클릭 효과 */
.btn, button, a[class*="btn"] {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

/* 스크롤 애니메이션 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(50px);
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* 텍스트 페이드인 효과 */
.text-fade-in {
    opacity: 0;
    animation: textFadeIn 1s ease forwards;
    animation-delay: 0.5s;
}

@keyframes textFadeIn {
    to {
        opacity: 1;
    }
}

/* 이미지 로딩 플레이스홀더 */
.image-wrapper {
    position: relative;
    background: linear-gradient(90deg, 
        rgba(74, 144, 226, 0.1) 0%, 
        rgba(74, 144, 226, 0.2) 50%, 
        rgba(74, 144, 226, 0.1) 100%);
    background-size: 200% 100%;
    animation: imageShimmer 1.5s infinite;
}

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

.image-wrapper img {
    opacity: 0;
    transition: opacity 0.6s ease;
}

.image-wrapper img.loaded {
    opacity: 1;
}

/* 카운터 애니메이션 */
.counter {
    display: inline-block;
    opacity: 0;
    transform: translateY(20px);
}

.counter.active {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.6s ease;
}

/* 그라데이션 애니메이션 */
.gradient-animate {
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite;
}

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

/* 모바일 터치 피드백 */
@media (max-width: 768px) {
    .touchable {
        -webkit-tap-highlight-color: rgba(74, 144, 226, 0.2);
    }
    
    .touchable:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
}

/* 스크롤바 커스터마이징 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #4a90e2 0%, #7b68ee 100%);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #5ba0f2 0%, #8b6efe 100%);
}

/* 페이지 전환 효과 */
.page-enter {
    animation: pageEnter 0.6s ease forwards;
}

@keyframes pageEnter {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.page-exit {
    animation: pageExit 0.4s ease forwards;
}

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