/* WP06 Phase 4: Spring Animations and Micro-interactions */
/* Physics-based motion for accordions, badges, and interactive elements */

/* =============================================================================
   SPRING EASING CURVES
   ============================================================================= */

/* Spring easing curves for natural, physics-based motion */
:root {
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-spring-soft: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-spring-bounce: cubic-bezier(0.68, -0.6, 0.32, 1.6);
}

/* =============================================================================
   SPRING KEYFRAMES
   ============================================================================= */

/* Spring expand animation for accordions */
@keyframes springExpand {
    0% {
        opacity: 0;
        transform: translateY(-8px) scale(0.98);
    }
    60% {
        opacity: 1;
        transform: translateY(2px) scale(1.01);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Spring collapse animation */
@keyframes springCollapse {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(-8px) scale(0.98);
    }
}

/* Spring slide up (for bottom sheet) */
@keyframes springSlideUp {
    0% {
        transform: translateY(100%);
    }
    60% {
        transform: translateY(-3%);
    }
    100% {
        transform: translateY(0);
    }
}

/* Badge bounce on appear */
@keyframes badgeBounce {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Gentle bounce for hover states */
@keyframes gentleBounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(3px);
    }
}

/* =============================================================================
   ACCORDION SPRING ANIMATIONS
   ============================================================================= */

/* Accordion spring animation classes */
.accordion-section.expanded .accordion-inner {
    animation: springExpand 350ms var(--ease-spring) forwards;
}

/* Icon rotation with spring */
.accordion-section .accordion-icon {
    transition: transform 350ms var(--ease-spring);
}

.accordion-section.expanded .accordion-icon {
    transform: rotate(180deg);
}

/* =============================================================================
   STAGGERED REVEAL FOR ACCORDION SECTIONS
   ============================================================================= */

/* Stagger delays for accordion sections opening */
.metadata-accordions .accordion-section:nth-child(1) .accordion-inner {
    animation-delay: 0ms;
}
.metadata-accordions .accordion-section:nth-child(2) .accordion-inner {
    animation-delay: 50ms;
}
.metadata-accordions .accordion-section:nth-child(3) .accordion-inner {
    animation-delay: 100ms;
}
.metadata-accordions .accordion-section:nth-child(4) .accordion-inner {
    animation-delay: 150ms;
}
.metadata-accordions .accordion-section:nth-child(5) .accordion-inner {
    animation-delay: 200ms;
}

/* Stagger reveal for detail items within accordion */
.details-list .detail-item,
.insights-list .insight-item {
    opacity: 0;
    animation: fadeInUp 300ms var(--ease-spring-soft) forwards;
}

.accordion-section.expanded .details-list .detail-item:nth-child(1),
.accordion-section.expanded .insights-list .insight-item:nth-child(1) {
    animation-delay: 50ms;
}
.accordion-section.expanded .details-list .detail-item:nth-child(2),
.accordion-section.expanded .insights-list .insight-item:nth-child(2) {
    animation-delay: 100ms;
}
.accordion-section.expanded .details-list .detail-item:nth-child(3),
.accordion-section.expanded .insights-list .insight-item:nth-child(3) {
    animation-delay: 150ms;
}
.accordion-section.expanded .details-list .detail-item:nth-child(4),
.accordion-section.expanded .insights-list .insight-item:nth-child(4) {
    animation-delay: 200ms;
}
.accordion-section.expanded .details-list .detail-item:nth-child(5),
.accordion-section.expanded .insights-list .insight-item:nth-child(5) {
    animation-delay: 250ms;
}

/* Keep items visible after animation */
.accordion-section.expanded .details-list .detail-item,
.accordion-section.expanded .insights-list .insight-item {
    opacity: 1;
}

/* =============================================================================
   MICRO-INTERACTIONS
   ============================================================================= */

/* Button press effect */
.micro-press {
    transition: transform 100ms ease;
}

.micro-press:active {
    transform: scale(0.97);
}

/* Icon pop on hover */
.micro-icon-pop i,
.micro-icon-pop .fas,
.micro-icon-pop .far {
    transition: transform 200ms var(--ease-spring);
}

.micro-icon-pop:hover i,
.micro-icon-pop:hover .fas,
.micro-icon-pop:hover .far {
    transform: scale(1.15);
}

/* Ripple effect mixin (apply to buttons) */
.micro-ripple {
    position: relative;
    overflow: hidden;
}

.micro-ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 400ms ease, height 400ms ease, opacity 400ms ease;
    opacity: 0;
}

.micro-ripple:active::after {
    width: 200%;
    height: 200%;
    opacity: 1;
    transition: width 0ms, height 0ms, opacity 0ms;
}

/* =============================================================================
   BADGE AND ICON ANIMATIONS
   ============================================================================= */

/* Preview badge bounce */
.preview-badge {
    animation: badgeBounce 300ms var(--ease-spring) forwards;
}

/* Section icon glow on hover */
.section-icon {
    transition: transform 200ms var(--ease-spring), box-shadow 200ms ease;
}

.accordion-header:hover .section-icon {
    transform: scale(1.1);
}

/* Toggle button chevron bounce */
.details-toggle .toggle-icon {
    transition: transform 300ms var(--ease-spring);
}

.article-card.details-expanded .details-toggle .toggle-icon {
    transform: rotate(180deg);
}

.details-toggle:hover .toggle-icon {
    animation: gentleBounce 600ms ease infinite;
}

.article-card.details-expanded .details-toggle:hover .toggle-icon {
    animation: none;
    transform: rotate(180deg);
}

/* =============================================================================
   REDUCED MOTION
   ============================================================================= */

@media (prefers-reduced-motion: reduce) {
    .accordion-section.expanded .accordion-inner,
    .preview-badge,
    .details-list .detail-item,
    .insights-list .insight-item {
        animation: none;
        opacity: 1;
    }

    .accordion-section .accordion-icon,
    .section-icon,
    .details-toggle .toggle-icon,
    .micro-icon-pop i,
    .micro-icon-pop .fas,
    .micro-icon-pop .far {
        transition: none;
    }

    .details-toggle:hover .toggle-icon {
        animation: none;
    }
}