/* ============================================================
   Animations — animations.css
   IntersectionObserver 入場、Keyframes、浮動效果
   ============================================================ */

/* ── Animate on Scroll ── */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity var(--duration-slow) var(--ease-out),
        transform var(--duration-slow) var(--ease-out);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-fade {
    opacity: 0;
    transition: opacity var(--duration-slow) var(--ease-out);
}

.animate-fade.visible {
    opacity: 1;
}

.animate-left {
    opacity: 0;
    transform: translateX(-32px);
    transition: opacity var(--duration-slow) var(--ease-out),
        transform var(--duration-slow) var(--ease-out);
}

.animate-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.animate-right {
    opacity: 0;
    transform: translateX(32px);
    transition: opacity var(--duration-slow) var(--ease-out),
        transform var(--duration-slow) var(--ease-out);
}

.animate-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.animate-scale {
    opacity: 0;
    transform: scale(0.92);
    transition: opacity var(--duration-slow) var(--ease-out),
        transform var(--duration-slow) var(--ease-out);
}

.animate-scale.visible {
    opacity: 1;
    transform: scale(1);
}

/* ── Stagger Delay ── */
.stagger>* {
    transition-delay: calc(var(--stagger-i, 0) * 0.08s);
}

/* ── Keyframes ── */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(32px);
    }

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes float {

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

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

@keyframes pulse-glow {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(212, 160, 23, 0.3);
    }

    50% {
        box-shadow: 0 0 0 8px rgba(212, 160, 23, 0);
    }
}

@keyframes slide-in-right {
    from {
        transform: translateX(100%);
    }

    to {
        transform: translateX(0);
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@keyframes shimmer {
    from {
        background-position: -200% 0;
    }

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

/* ── Hero particles ── */
.hero-particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    animation: float 6s ease-in-out infinite;
    pointer-events: none;
}

/* ── Loading skeleton ── */
.skeleton {
    background: linear-gradient(90deg,
            var(--color-neutral-200) 25%,
            var(--color-neutral-100) 37%,
            var(--color-neutral-200) 63%);
    background-size: 400% 100%;
    animation: shimmer 1.4s ease infinite;
    border-radius: var(--radius-md);
}