/* ============================================================================
   Page Transitions
   ============================================================================ */

:root {
    --transition-duration: 500ms;
    --transition-easing: cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* Transition Overlay Container */
#transition-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
}

/* ============================================================================
   Transition Types
   ============================================================================ */

/* Fade Transition */
.transition-fade {
    background: #000000;
    opacity: 0;
    width: 100%;
    height: 100%;
    transition: opacity var(--transition-duration) var(--transition-easing);
}

.transition-fade.active {
    opacity: 1;
}

/* Wipe Right */
.transition-wipe-right {
    background: #000000;
    width: 0%;
    height: 100%;
    transform-origin: left;
    transition: width var(--transition-duration) var(--transition-easing);
}

.transition-wipe-right.active {
    width: 100%;
}

/* Wipe Left */
.transition-wipe-left {
    background: #000000;
    width: 0%;
    height: 100%;
    transform-origin: right;
    margin-left: auto;
    transition: width var(--transition-duration) var(--transition-easing);
}

.transition-wipe-left.active {
    width: 100%;
}

/* Wipe Down */
.transition-wipe-down {
    background: #000000;
    width: 100%;
    height: 0%;
    transform-origin: top;
    transition: height var(--transition-duration) var(--transition-easing);
}

.transition-wipe-down.active {
    height: 100%;
}

/* Wipe Up */
.transition-wipe-up {
    background: #000000;
    width: 100%;
    height: 0%;
    transform-origin: bottom;
    margin-top: auto;
    transition: height var(--transition-duration) var(--transition-easing);
}

.transition-wipe-up.active {
    height: 100%;
}

/* Circle Wipe */
.transition-circle {
    background: #000000;
    width: 200vmax;
    height: 200vmax;
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    transition: transform var(--transition-duration) var(--transition-easing);
}

.transition-circle.active {
    transform: translate(-50%, -50%) scale(1);
}

/* Diamond Wipe */
.transition-diamond {
    background: #000000;
    width: 141.42vmax; /* sqrt(2) * 100 for diagonal coverage */
    height: 141.42vmax;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg) scale(0);
    transition: transform var(--transition-duration) var(--transition-easing);
}

.transition-diamond.active {
    transform: translate(-50%, -50%) rotate(45deg) scale(1);
}

/* Slide Right */
.transition-slide-right {
    background: #000000;
    width: 100%;
    height: 100%;
    transform: translateX(-100%);
    transition: transform var(--transition-duration) var(--transition-easing);
}

.transition-slide-right.active {
    transform: translateX(0%);
}

/* Slide Left */
.transition-slide-left {
    background: #000000;
    width: 100%;
    height: 100%;
    transform: translateX(100%);
    transition: transform var(--transition-duration) var(--transition-easing);
}

.transition-slide-left.active {
    transform: translateX(0%);
}

/* Bars (Horizontal blinds effect) */
.transition-bars {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
}

.transition-bars .bar {
    flex: 1;
    background: #000000;
    transform: scaleX(0);
    transform-origin: left;
}

.transition-bars.active .bar {
    transform: scaleX(1);
    transition: transform var(--transition-duration) var(--transition-easing);
}

/* Stagger the bars for a cooler effect */
.transition-bars.active .bar:nth-child(1) { transition-delay: 0ms; }
.transition-bars.active .bar:nth-child(2) { transition-delay: 50ms; }
.transition-bars.active .bar:nth-child(3) { transition-delay: 100ms; }
.transition-bars.active .bar:nth-child(4) { transition-delay: 150ms; }
.transition-bars.active .bar:nth-child(5) { transition-delay: 200ms; }
.transition-bars.active .bar:nth-child(6) { transition-delay: 150ms; }
.transition-bars.active .bar:nth-child(7) { transition-delay: 100ms; }
.transition-bars.active .bar:nth-child(8) { transition-delay: 50ms; }

/* Pixel Dissolve */
.transition-pixels {
    display: grid;
    grid-template-columns: repeat(20, 1fr);
    grid-template-rows: repeat(20, 1fr);
    width: 100%;
    height: 100%;
}

.transition-pixels .pixel {
    background: #000000;
    opacity: 0;
}

.transition-pixels.active .pixel {
    opacity: 1;
    transition: opacity calc(var(--transition-duration) * 0.6) ease-out;
}

/* Randomize pixel animation delays for dissolve effect */
.transition-pixels.active .pixel:nth-child(odd) { transition-delay: 0ms; }
.transition-pixels.active .pixel:nth-child(even) { transition-delay: 50ms; }
.transition-pixels.active .pixel:nth-child(3n) { transition-delay: 100ms; }
.transition-pixels.active .pixel:nth-child(5n) { transition-delay: 150ms; }
.transition-pixels.active .pixel:nth-child(7n) { transition-delay: 200ms; }

/* Zoom */
.transition-zoom {
    background: #000000;
    width: 100%;
    height: 100%;
    transform: scale(0);
    transition: transform var(--transition-duration) var(--transition-easing);
}

.transition-zoom.active {
    transform: scale(1);
}