/* ========================================================================
   GIFTAWEB — Animation Keyframes & Utilities
   Smooth, intentional, premium micro-interactions
   ======================================================================== */

/* ----- Entrance Animations ----- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.85);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ----- Floating & Breathing ----- */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-12px); }
}

@keyframes floatGentle {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    33% { transform: translateY(-8px) rotate(1deg); }
    66% { transform: translateY(-4px) rotate(-1deg); }
}

@keyframes floatSlow {
    0%, 100% { transform: translateY(0) rotate(var(--float-rotate, 0deg)); }
    50% { transform: translateY(-15px) rotate(calc(var(--float-rotate, 0deg) + 2deg)); }
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    14% { transform: scale(1.15); }
    28% { transform: scale(1); }
    42% { transform: scale(1.1); }
    56% { transform: scale(1); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@keyframes breathe {
    0%, 100% { transform: scale(1); opacity: 0.7; }
    50% { transform: scale(1.05); opacity: 1; }
}

/* ----- Shimmer & Sparkle ----- */
@keyframes shimmer {
    0% { background-position: -200% center; }
    100% { background-position: 200% center; }
}

@keyframes sparkle {
    0%, 100% { opacity: 0; transform: scale(0) rotate(0deg); }
    50% { opacity: 1; transform: scale(1) rotate(180deg); }
}

@keyframes twinkle {
    0%, 100% { opacity: 0.2; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1.2); }
}

/* ----- Scroll Indicator ----- */
@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); opacity: 0.5; }
    50% { transform: translateY(10px); opacity: 1; }
}

/* ----- Rotation ----- */
@keyframes spinSlow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes wiggle {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(3deg); }
    75% { transform: rotate(-3deg); }
}

/* ----- Path Drawing ----- */
@keyframes drawLine {
    from { stroke-dashoffset: var(--path-length, 1000); }
    to { stroke-dashoffset: 0; }
}

/* ----- Typewriter ----- */
@keyframes typewriter {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes blinkCursor {
    0%, 100% { border-right-color: var(--rose); }
    50% { border-right-color: transparent; }
}

/* ----- Envelope Animation ----- */
@keyframes envelopeFlap {
    0% { transform: rotateX(0deg); }
    100% { transform: rotateX(180deg); }
}

@keyframes letterSlideUp {
    0% { transform: translateY(60px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

@keyframes letterUnfold {
    0% { transform: scaleY(0); transform-origin: bottom; }
    100% { transform: scaleY(1); transform-origin: bottom; }
}

/* ----- Confetti Burst ----- */
@keyframes confettiFall {
    0% {
        transform: translateY(-20px) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

@keyframes confettiBurst {
    0% {
        transform: translate(0, 0) scale(0);
        opacity: 0;
    }
    20% {
        opacity: 1;
        transform: translate(var(--tx, 0), var(--ty, 0)) scale(1);
    }
    100% {
        transform: translate(calc(var(--tx, 0) * 2), calc(var(--ty, 0) + 200px)) scale(0.5);
        opacity: 0;
    }
}

/* ----- Magical Reveal (Builder) ----- */
@keyframes magicGlow {
    0% { box-shadow: 0 0 0 0 rgba(255, 143, 171, 0); }
    50% { box-shadow: 0 0 40px 15px rgba(255, 143, 171, 0.3); }
    100% { box-shadow: 0 0 0 0 rgba(255, 143, 171, 0); }
}

@keyframes starTrail {
    0% { transform: translate(0, 0) scale(0); opacity: 0; }
    20% { opacity: 1; transform: translate(var(--sx), var(--sy)) scale(1); }
    100% { opacity: 0; transform: translate(calc(var(--sx) * 3), calc(var(--sy) * 3)) scale(0); }
}

@keyframes revealGlow {
    0% { filter: blur(20px); opacity: 0; transform: scale(0.9); }
    60% { filter: blur(5px); opacity: 0.8; }
    100% { filter: blur(0); opacity: 1; transform: scale(1); }
}

@keyframes stampIn {
    0% { transform: scale(3) rotate(-15deg); opacity: 0; }
    60% { transform: scale(0.9) rotate(2deg); opacity: 1; }
    80% { transform: scale(1.05) rotate(-1deg); }
    100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

/* ----- Wave Divider ----- */
@keyframes waveMove {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ===========================
   ANIMATION UTILITY CLASSES
   Applied by IntersectionObserver
   =========================== */
.fade-in-up,
.fade-in-down,
.fade-in-left,
.fade-in-right,
.scale-in {
    opacity: 0;
    transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
}

.fade-in-up { transform: translateY(40px); }
.fade-in-down { transform: translateY(-30px); }
.fade-in-left { transform: translateX(-40px); }
.fade-in-right { transform: translateX(40px); }
.scale-in { transform: scale(0.85); }

/* Visible state */
.fade-in-up.visible,
.fade-in-down.visible,
.fade-in-left.visible,
.fade-in-right.visible,
.scale-in.visible {
    opacity: 1;
    transform: translate(0) scale(1);
}

/* Staggered delays */
.delay-1 { transition-delay: 0.1s !important; }
.delay-2 { transition-delay: 0.2s !important; }
.delay-3 { transition-delay: 0.3s !important; }
.delay-4 { transition-delay: 0.4s !important; }
.delay-5 { transition-delay: 0.5s !important; }
.delay-6 { transition-delay: 0.6s !important; }
.delay-7 { transition-delay: 0.7s !important; }
.delay-8 { transition-delay: 0.8s !important; }

/* Stagger children */
.stagger-children > * {
    opacity: 0;
    transform: translateY(25px);
    transition: opacity 0.6s var(--ease-smooth), transform 0.6s var(--ease-smooth);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.05s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.15s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.2s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.25s; opacity: 1; transform: translateY(0); }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.3s; opacity: 1; transform: translateY(0); }

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .fade-in-up, .fade-in-down, .fade-in-left, .fade-in-right, .scale-in {
        opacity: 1;
        transform: none;
    }
}