/* 📚 학습포인트: 스크롤 애니메이션 CSS */

/* 기본 상태 (화면에 나타나기 전) */
[data-scroll-reveal] {
    opacity: 0;
    transition: opacity 0.4s ease, transform 0.4s ease;
    will-change: opacity, transform;
}

/* Fade Up 애니몀8이션 */
[data-scroll-reveal="fade-up"] {
    transform: translateY(20px);
}

[data-scroll-reveal="fade-up"].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Fade Down 애니메이션 */
[data-scroll-reveal="fade-down"] {
    transform: translateY(-30px);
}

[data-scroll-reveal="fade-down"].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Fade Left 애니메이션 */
[data-scroll-reveal="fade-left"] {
    transform: translateX(30px);
}

[data-scroll-reveal="fade-left"].revealed {
    opacity: 1;
    transform: translateX(0);
}

/* Fade Right 애니메이션 */
[data-scroll-reveal="fade-right"] {
    transform: translateX(-30px);
}

[data-scroll-reveal="fade-right"].revealed {
    opacity: 1;
    transform: translateX(0);
}

/* Zoom In 애니메이션 */
[data-scroll-reveal="zoom-in"] {
    transform: scale(0.8);
    border: none !important;
    outline: none !important;
}

[data-scroll-reveal="zoom-in"].revealed {
    opacity: 1;
    transform: scale(1);
    border: none !important;
    outline: none !important;
}

/* Zoom Out 애니메이션 */
[data-scroll-reveal="zoom-out"] {
    transform: scale(1.2);
}

[data-scroll-reveal="zoom-out"].revealed {
    opacity: 1;
    transform: scale(1);
}

/* 📚 학습포인트: 지연 시간 설정 */
[data-scroll-delay="100"].revealed {
    transition-delay: 0.1s;
}

[data-scroll-delay="150"].revealed {
    transition-delay: 0.15s;
}

[data-scroll-delay="200"].revealed {
    transition-delay: 0.2s;
}

[data-scroll-delay="250"].revealed {
    transition-delay: 0.25s;
}

[data-scroll-delay="300"].revealed {
    transition-delay: 0.3s;
}

[data-scroll-delay="350"].revealed {
    transition-delay: 0.35s;
}

[data-scroll-delay="400"].revealed {
    transition-delay: 0.4s;
}

/* ======================================
   로딩 애니메이션
   ====================================== */

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
}

/* 📚 학습포인트: 타이핑 효과 */
.typing-text {
    font-size: 3rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    overflow: hidden;
    border-right: 3px solid;
    white-space: nowrap;
    animation: typing 2s steps(10) forwards, blink 0.75s step-end infinite;
}

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

@keyframes blink {
    50% {
        border-color: transparent;
    }
}

/* 로딩 바 */
.loading-bar {
    width: 300px;
    height: 4px;
    background: var(--bg-gray);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 2rem;
}

.loading-progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    width: 0;
    animation: loadingProgress 2s ease forwards;
}

@keyframes loadingProgress {
    to {
        width: 100%;
    }
}

/* ======================================
   커스텀 마우스 커서
   ====================================== */

/* 📚 학습포인트: 커스텀 커서 */
.custom-cursor {
    width: 40px;
    height: 40px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    transition: all 0.15s ease;
    display: none;
    transform: translate(-50%, -50%);
}

.custom-cursor.visible {
    display: block;
}

.custom-cursor.hover {
    width: 60px;
    height: 60px;
    background: rgba(255, 214, 232, 0.2);
}

.cursor-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.custom-cursor.hover .cursor-text {
    opacity: 1;
}

/* 커스텀 커서 비활성화 (성능 최적화) */
@media (min-width: 1024px) {
    body {
        cursor: auto;
    }
    
    a, button, input, textarea {
        cursor: pointer;
    }
    
    .custom-cursor {
        display: none !important;
    }
}

/* ======================================
   버튼 리플 효과
   ====================================== */

/* 📚 학습포인트: 클릭 시 파문 효과 */
.ripple {
    position: relative;
    overflow: hidden;
}

.ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    animation: rippleEffect 0.6s ease-out;
}

/* JavaScript로 생성되는 리플 효과 */
.ripple-effect {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
    transform: scale(0);
    animation: rippleEffect 0.6s ease-out;
    pointer-events: none;
    z-index: 9999;
}

@keyframes rippleEffect {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* ======================================
   카드 틸트 효과 (3D)
   ====================================== */

/* 📚 학습포인트: 마우스 움직임에 따라 카드가 기울어짐 */
.project-card,
.testimonial-card {
    transition: transform 0.1s ease;
    transform-style: preserve-3d;
}

.project-card.tilt {
    animation: tilt 0.3s ease;
}

@keyframes tilt {
    0% {
        transform: perspective(1000px) rotateX(0deg) rotateY(0deg);
    }
    50% {
        transform: perspective(1000px) rotateX(5deg) rotateY(5deg);
    }
    100% {
        transform: perspective(1000px) rotateX(0deg) rotateY(0deg);
    }
}

/* ======================================
   모달 애니메이션
   ====================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    animation: fadeIn 0.3s ease;
}

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

.modal-content {
    position: relative;
    max-width: 1000px;
    max-height: 90vh;
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.4s ease;
    z-index: 1;
}

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

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    /* 항상 명확하게 보이도록 배경색 강화 */
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    /* 항상 보이도록 opacity 1로 고정 */
    opacity: 1;
    visibility: visible;
    transition: all var(--transition-fast);
    /* 아이콘 색상 */
    color: #ffffff;
    font-size: 20px;
}

.modal-close:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: rotate(90deg);
}

.modal-close:active {
    transform: scale(0.9) rotate(90deg);
}

/* 모달 슬라이더 */
.modal-slider {
    position: relative;
    height: 500px;
    overflow: hidden;
    background: var(--bg-gray);
}

.modal-slider-track {
    display: flex;
    height: 100%;
    transition: transform var(--transition-base);
}

.modal-slider-track img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    flex-shrink: 0;
}

.modal-slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    /* 고정된 크기 */
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    /* 클릭 모션 transition */
    transition: transform 0.1s ease, background 0.15s ease;
    z-index: 10;
}

.modal-slider-btn.prev {
    left: 20px;
}

.modal-slider-btn.next {
    right: 20px;
}

.modal-slider-btn:hover {
    background: var(--primary-color);
}

.modal-slider-btn:active {
    /* 눌리는 모션 - 위치 유지하면서 작아짐 */
    transform: translateY(-50%) scale(0.92);
}

.modal-slider-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.modal-slider-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all var(--transition-base);
}

.modal-slider-dot.active {
    background: var(--bg-white);
    width: 30px;
    border-radius: 5px;
}

/* 모달 정보 */
.modal-info {
    padding: var(--spacing-xl);
}

.modal-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.modal-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.modal-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.modal-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-light);
    border-radius: var(--radius-md);
}

.modal-detail {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.modal-detail strong {
    color: var(--text-primary);
    font-weight: 600;
}

.modal-detail span {
    color: var(--text-secondary);
}

.modal-story {
    margin-bottom: var(--spacing-lg);
}

.modal-story h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.modal-story p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.modal-navigation {
    display: flex;
    gap: var(--spacing-md);
}

.modal-nav-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: var(--spacing-md);
    background: var(--bg-light);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    /* 고정된 높이 */
    min-height: 48px;
    /* 클릭 모션 transition */
    transition: transform 0.1s ease, background 0.15s ease;
}

.modal-nav-btn:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.modal-nav-btn:active {
    /* 눌리는 모션 */
    transform: translateY(0) scale(0.98);
}

/* ======================================
   토스트 알림
   ====================================== */

/* 📚 학습포인트: 알림 메시지 */
.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-white);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    z-index: var(--z-tooltip);
    transition: bottom 0.3s ease;
}

.toast.show {
    bottom: 30px;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(-50%) rotate(0deg); }
    25% { transform: translateX(-50%) rotate(-2deg); }
    75% { transform: translateX(-50%) rotate(2deg); }
}

.toast-icon {
    font-size: 1.25rem;
}

.toast.success {
    border-left: 4px solid #10B981;
}

.toast.success .toast-icon::before {
    content: '✓';
    color: #10B981;
}

.toast.error {
    border-left: 4px solid #EF4444;
}

.toast.error .toast-icon::before {
    content: '✕';
    color: #EF4444;
}

.toast.info {
    border-left: 4px solid #3B82F6;
}

.toast.info .toast-icon::before {
    content: 'ℹ';
    color: #3B82F6;
}

/* ======================================
   스켈레톤 로딩
   ====================================== */

/* 📚 학습포인트: 이미지 로딩 전 플레이스홀더 */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-gray) 0%,
        var(--bg-light) 50%,
        var(--bg-gray) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

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

/* ======================================
   반응형 애니메이션
   ====================================== */

@media (max-width: 768px) {
    .typing-text {
        font-size: 2rem;
    }
    
    .loading-bar {
        width: 250px;
    }
    
    .modal-content {
        max-width: 95%;
        margin: var(--spacing-md);
    }
    
    .modal-slider {
        height: 300px;
    }
    
    .modal-details {
        grid-template-columns: 1fr;
    }
    
    .modal-navigation {
        flex-direction: column;
    }
    
    /* 모바일에서 커스텀 커서 비활성화 */
    .custom-cursor {
        display: none !important;
    }
}

/* ======================================
   접근성 (Reduced Motion)
   ====================================== */

/* 📚 학습포인트: 애니메이션을 원하지 않는 사용자를 위한 설정 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}