/* =====================================
   PORTFOLIO STACK 3D - AUTO-ROTATING
   ===================================== */

/* === CONTAINER === */
.portfolio-stack-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 2rem;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* === STACK WRAPPER === */
.portfolio-stack {
    position: relative;
    width: 100%;
    height: 500px;
    perspective: 1500px;
    transform-style: preserve-3d;
}

/* === INDIVIDUAL CARD === */
.portfolio-stack-card {
    position: absolute;
    width: 100%;
    max-width: 700px;
    height: 450px;
    left: 50%;
    top: 50%;
    transform-origin: center center;
    cursor: pointer;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
}

/* === STACK POSITIONING (3 visible cards) === */
/* Card position 0 - Front (active) */
.portfolio-stack-card[data-position="0"] {
    transform: translate(-50%, -50%) translateZ(0px) scale(1);
    z-index: 30;
    opacity: 1;
}

/* Card position 1 - Middle */
.portfolio-stack-card[data-position="1"] {
    transform: translate(-50%, -50%) translateZ(-100px) translateY(20px) scale(0.9);
    z-index: 20;
    opacity: 0.7;
}

/* Card position 2 - Back */
.portfolio-stack-card[data-position="2"] {
    transform: translate(-50%, -50%) translateZ(-200px) translateY(40px) scale(0.8);
    z-index: 10;
    opacity: 0.4;
}

/* Cards beyond position 2 - Hidden */
.portfolio-stack-card[data-position="3"],
.portfolio-stack-card[data-position="4"],
.portfolio-stack-card[data-position="5"] {
    transform: translate(-50%, -50%) translateZ(-300px) translateY(60px) scale(0.7);
    z-index: 0;
    opacity: 0;
    pointer-events: none;
}

/* === CARD IMAGE WRAPPER === */
.card-image-wrapper {
    position: relative;
    width: 100%;
    height: 350px;
    overflow: hidden;
    background: linear-gradient(135deg, #e0e0e0, #f5f5f5);
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

/* === OVERLAY ON HOVER === */
.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.portfolio-stack-card:hover .card-overlay {
    opacity: 1;
}

.portfolio-stack-card:hover .card-image {
    transform: scale(1.05);
}

/* === CARD INFO (Title + URL) === */
.card-info {
    padding: 1.5rem 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border-top: 1px solid var(--glass-border);
}

.card-title {
    font-family: var(--font-title);
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.card-url {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-light);
    letter-spacing: 0.5px;
}

/* === HOVER EFFECTS === */
.portfolio-stack-card[data-position="0"]:hover {
    transform: translate(-50%, -55%) translateZ(20px) scale(1.02);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
}

/* Pause animation on hover */
.portfolio-stack.paused .portfolio-stack-card {
    /* Animation is controlled by JS */
}

/* === STACK INDICATOR === */
.stack-indicator {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-gray);
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    z-index: 100;
}

.current-project {
    font-weight: 700;
    color: var(--text-dark);
}

/* === LOADING PLACEHOLDER (if no images yet) === */
.card-image-wrapper:empty::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #e0e0e0, #f5f5f5);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* === ANIMATIONS === */
/* Fade out (when card exits) */
@keyframes fadeOutLeft {
    from {
        opacity: 1;
        transform: translate(-50%, -50%) translateZ(0px) scale(1);
    }
    to {
        opacity: 0;
        transform: translate(-120%, -50%) translateZ(-100px) scale(0.8) rotateY(-20deg);
    }
}

/* Fade in (when card enters from back) */
@keyframes fadeInFromBack {
    from {
        opacity: 0;
        transform: translate(-50%, -50%) translateZ(-300px) translateY(60px) scale(0.7);
    }
    to {
        opacity: 0.4;
        transform: translate(-50%, -50%) translateZ(-200px) translateY(40px) scale(0.8);
    }
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .portfolio-stack-container {
        min-height: 500px;
        padding: 2rem 1rem;
    }
    
    .portfolio-stack {
        height: 450px;
    }
    
    .portfolio-stack-card {
        max-width: 90%;
        height: 400px;
    }
    
    .card-image-wrapper {
        height: 300px;
    }
    
    .card-title {
        font-size: 1.5rem;
    }
    
    .card-url {
        font-size: 0.85rem;
    }
    
    /* Simplify stack on mobile - only show front card clearly */
    .portfolio-stack-card[data-position="1"] {
        transform: translate(-50%, -50%) translateZ(-80px) translateY(15px) scale(0.92);
        opacity: 0.5;
    }
    
    .portfolio-stack-card[data-position="2"] {
        transform: translate(-50%, -50%) translateZ(-150px) translateY(30px) scale(0.85);
        opacity: 0.2;
    }
}

@media (max-width: 480px) {
    .portfolio-stack-card {
        height: 350px;
    }
    
    .card-image-wrapper {
        height: 250px;
    }
    
    .card-info {
        padding: 1rem 1.5rem;
    }
    
    .card-title {
        font-size: 1.3rem;
    }
}

/* === ACCESSIBILITY === */
.portfolio-stack-card:focus {
    outline: 3px solid var(--text-dark);
    outline-offset: 5px;
}

.portfolio-stack-card:focus-visible {
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4), 0 0 0 5px rgba(0, 0, 0, 0.2);
}