/* ═══════════════════════════════════════════════════════════
   ITHEMBALETHU — ANIMATION SYSTEM
   Keyframes, scroll reveals, transitions
   ═══════════════════════════════════════════════════════════ */

/* ── Keyframes ─────────────────────────────────────────── */

/* Heavy drop-in (elements settle with weight) */
@keyframes dropIn {
    0% {
        opacity: 0;
        transform: translateY(-40px) scale(0.95);
    }

    60% {
        transform: translateY(4px) scale(1.01);
    }

    80% {
        transform: translateY(-2px) scale(0.995);
    }

    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Slide up reveal */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(60px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Slide in from left */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-60px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Slide in from right */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(60px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Scale in */
@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Fade in */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Pulse glow */
@keyframes pulseGlow {

    0%,
    100% {
        box-shadow: 0 0 20px var(--color-safety-yellow-glow);
    }

    50% {
        box-shadow: 0 0 40px var(--color-safety-yellow-glow),
            0 0 60px rgba(255, 215, 0, 0.1);
    }
}

/* Float */
@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

/* Shimmer for loading states */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

/* Dust particles floating */
@keyframes dustFloat {
    0% {
        opacity: 0;
        transform: translateY(0) translateX(0);
    }

    20% {
        opacity: 0.6;
    }

    80% {
        opacity: 0.3;
    }

    100% {
        opacity: 0;
        transform: translateY(-100px) translateX(30px);
    }
}

/* Progress bar fill */
@keyframes fillProgress {
    from {
        width: 0;
    }

    to {
        width: var(--progress, 0%);
    }
}

/* Typing cursor blink */
@keyframes blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

/* Scan line (for blueprint effect) */
@keyframes scanLine {
    0% {
        transform: translateY(-100%);
    }

    100% {
        transform: translateY(100vh);
    }
}

/* ── Scroll Reveal Classes ─────────────────────────────── */
/* Elements start hidden, become visible via Intersection Observer */

.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity var(--transition-slow),
        transform var(--transition-heavy);
    will-change: opacity, transform;
}

.reveal--left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity var(--transition-slow),
        transform var(--transition-heavy);
    will-change: opacity, transform;
}

.reveal--right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity var(--transition-slow),
        transform var(--transition-heavy);
    will-change: opacity, transform;
}

.reveal--scale {
    opacity: 0;
    transform: scale(0.85);
    transition: opacity var(--transition-slow),
        transform var(--transition-heavy);
    will-change: opacity, transform;
}

.reveal--drop {
    opacity: 0;
    transform: translateY(-30px);
    transition: opacity var(--transition-slow),
        transform var(--transition-heavy);
    will-change: opacity, transform;
}

/* Active state (when in viewport) */
.reveal.is-visible,
.reveal--left.is-visible,
.reveal--right.is-visible,
.reveal--scale.is-visible,
.reveal--drop.is-visible {
    opacity: 1;
    transform: translate(0) scale(1);
}

/* Stagger children animation delays */
.stagger>*:nth-child(1) {
    transition-delay: 0ms;
}

.stagger>*:nth-child(2) {
    transition-delay: 100ms;
}

.stagger>*:nth-child(3) {
    transition-delay: 200ms;
}

.stagger>*:nth-child(4) {
    transition-delay: 300ms;
}

.stagger>*:nth-child(5) {
    transition-delay: 400ms;
}

.stagger>*:nth-child(6) {
    transition-delay: 500ms;
}

.stagger>*:nth-child(7) {
    transition-delay: 600ms;
}

.stagger>*:nth-child(8) {
    transition-delay: 700ms;
}

/* ── Hover Transitions ─────────────────────────────────── */
.hover-lift {
    transition: transform var(--transition-base),
        box-shadow var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.hover-glow {
    transition: box-shadow var(--transition-base);
}

.hover-glow:hover {
    box-shadow: var(--shadow-glow);
}

.hover-scale {
    transition: transform var(--transition-base);
}

.hover-scale:hover {
    transform: scale(1.05);
}

/* ── Section Transitions (Morphing) ─────────────────── */
.section-morph {
    position: relative;
}

.section-morph::before {
    content: '';
    position: absolute;
    top: -80px;
    left: 0;
    right: 0;
    height: 160px;
    background: linear-gradient(to bottom,
            transparent,
            var(--section-bg, var(--color-asphalt)));
    z-index: var(--z-base);
    pointer-events: none;
}

/* ── Parallax Layers ──────────────────────────────────── */
.parallax-container {
    position: relative;
    overflow: hidden;
}

.parallax-layer {
    will-change: transform;
    transition: transform 0.1s linear;
}

.parallax-layer--slow {
    --parallax-speed: 0.3;
}

.parallax-layer--medium {
    --parallax-speed: 0.5;
}

.parallax-layer--fast {
    --parallax-speed: 0.7;
}

/* ── Progress Bar ──────────────────────────────────────── */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg,
            var(--color-safety-yellow),
            var(--color-safety-yellow-dark));
    z-index: calc(var(--z-nav) + 1);
    transition: width 50ms linear;
    box-shadow: var(--shadow-glow);
}

/* ── Custom Cursor ─────────────────────────────────────── */
.custom-cursor {
    position: fixed;
    top: 0;
    left: 0;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-safety-yellow);
    border-radius: 50%;
    pointer-events: none;
    z-index: var(--z-cursor);
    transition: width 0.2s, height 0.2s, border-color 0.2s;
    transform: translate(-50%, -50%);
    mix-blend-mode: difference;
}

.custom-cursor--hover {
    width: 50px;
    height: 50px;
    border-color: var(--color-safety-yellow);
    background: var(--color-safety-yellow-glow);
}

.custom-cursor__dot {
    position: fixed;
    top: 0;
    left: 0;
    width: 6px;
    height: 6px;
    background: var(--color-safety-yellow);
    border-radius: 50%;
    pointer-events: none;
    z-index: var(--z-cursor);
    transform: translate(-50%, -50%);
}

/* ── Loading Screen ─────────────────────────────────────── */
.loader {
    position: fixed;
    inset: 0;
    background: var(--color-asphalt);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loader.is-hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader__bar {
    width: 200px;
    height: 3px;
    background: var(--color-asphalt-lighter);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: var(--space-md);
}

.loader__bar-fill {
    height: 100%;
    background: var(--color-safety-yellow);
    border-radius: var(--radius-full);
    animation: fillProgress 1.5s var(--ease-out-expo) forwards;
    --progress: 100%;
}

.loader__text {
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    color: var(--color-safety-yellow);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-top: var(--space-sm);
}