/* ===== Keyframe Animations ===== */

/* Fade Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

/* Heartbeat */
@keyframes heartbeat {
    0%, 100% {
        transform: scale(1);
    }
    15% {
        transform: scale(1.15);
    }
    30% {
        transform: scale(1);
    }
    45% {
        transform: scale(1.1);
    }
}

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

/* Shake (for confetti button) */
@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(5px);
    }
}

/* Float (for hearts) */
@keyframes floatUp {
    0% {
        opacity: 1;
        transform: translateY(100vh) rotate(0deg) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(-100px) rotate(720deg) scale(0.5);
    }
}

/* Confetti Fall */
@keyframes confettiFall {
    0% {
        opacity: 1;
        transform: translateY(-10px) rotate(0deg);
    }
    100% {
        opacity: 0;
        transform: translateY(100vh) rotate(720deg);
    }
}

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

/* Glow */
@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 5px var(--purple-400), 0 0 10px var(--purple-500);
    }
    50% {
        box-shadow: 0 0 20px var(--purple-400), 0 0 30px var(--purple-500);
    }
}

/* Swing */
@keyframes swing {
    0%, 100% {
        transform: rotate(-3deg);
    }
    50% {
        transform: rotate(3deg);
    }
}

/* Scale Pop */
@keyframes scalePop {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

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

/* ===== Floating Hearts Styles ===== */
.floating-heart {
    position: absolute;
    bottom: -30px;
    pointer-events: none;
    z-index: 5;
    will-change: transform, opacity;
}

.floating-heart svg {
    width: 100%;
    height: 100%;
}

/* ===== Confetti Styles ===== */
.confetti {
    position: absolute;
    top: -20px;
    width: 10px;
    height: 10px;
    animation: confettiFall linear forwards;
    pointer-events: none;
}

.confetti.square {
    border-radius: 2px;
}

.confetti.circle {
    border-radius: 50%;
}

.confetti.ribbon {
    width: 8px;
    height: 20px;
    border-radius: 2px;
}

/* Confetti Colors */
.confetti.purple-1 { background: var(--purple-400); }
.confetti.purple-2 { background: var(--purple-500); }
.confetti.purple-3 { background: var(--purple-300); }
.confetti.gold { background: var(--gold); }
.confetti.white { background: white; }
.confetti.pink { background: var(--purple-pastel-1); }

/* ===== Interactive Element Animations ===== */

/* Photo hover effect */
.photo-placeholder:hover .placeholder-icon {
    animation: scalePop 0.5s ease;
}

/* Button shine effect */
.nav-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: left 0.5s ease;
}

.nav-btn:hover::after {
    left: 100%;
}

/* Love note reveal */
.love-note {
    perspective: 1000px;
}

/* Dream items stagger animation */
.dream-item {
    opacity: 0;
    animation: fadeInUp 0.4s ease forwards;
}

.dream-item:nth-child(1) { animation-delay: 0.05s; }
.dream-item:nth-child(2) { animation-delay: 0.1s; }
.dream-item:nth-child(3) { animation-delay: 0.15s; }
.dream-item:nth-child(4) { animation-delay: 0.2s; }

/* Page turn hint - subtle fade only */
.cover-hint {
    animation: pulse 3s ease-in-out infinite;
}

/* Music button playing state */
.music-btn.playing svg {
    opacity: 0.9;
}

/* Milestone badge - subtle shine on hover only */
.milestone-badge {
    position: relative;
    overflow: hidden;
}

@media (hover: hover) {
    .milestone-badge::after {
        content: '';
        position: absolute;
        top: -50%;
        left: -100%;
        width: 50%;
        height: 200%;
        background: linear-gradient(
            90deg,
            transparent,
            rgba(255, 255, 255, 0.25),
            transparent
        );
        transition: left 0.6s ease;
    }
    
    .milestone-badge:hover::after {
        left: 150%;
    }
}

/* Anniversary counter - no glow, cleaner look */
.anniversary-counter {
    /* Static, elegant appearance */
}

/* Letter - static, no animation for cleaner look */
.letter-container {
    /* Removed swing animation - too distracting */
}

/* ===== Page Transition Helpers ===== */
.page-entering {
    animation: fadeIn 0.3s ease;
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .floating-heart,
    .confetti {
        display: none;
    }
}