/* ============================================================
   PDKS Animations — Keyframes & Utility Classes
   ============================================================ */

/* === Keyframes === */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(16px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideDown {
    from {
        max-height: 0;
        opacity: 0;
    }
    to {
        max-height: 500px;
        opacity: 1;
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* === Animation Utility Classes === */

.animate-in {
    animation: fadeInUp var(--duration-reveal) var(--ease-out-expo) both;
}

.animate-fade {
    animation: fadeIn var(--duration-reveal) var(--ease-out-expo) both;
}

.animate-slide-right {
    animation: slideInRight var(--duration-reveal) var(--ease-out-expo) both;
}

.animate-scale {
    animation: scaleIn var(--duration-normal) var(--ease-out-expo) both;
}

/* Stagger delay classes (60ms increments) */
.animate-delay-1 { animation-delay: 60ms; }
.animate-delay-2 { animation-delay: 120ms; }
.animate-delay-3 { animation-delay: 180ms; }
.animate-delay-4 { animation-delay: 240ms; }
.animate-delay-5 { animation-delay: 300ms; }
.animate-delay-6 { animation-delay: 360ms; }
.animate-delay-7 { animation-delay: 420ms; }
.animate-delay-8 { animation-delay: 480ms; }

/* Auto-staggering children */
.stagger-children > *:nth-child(1) { animation-delay: 60ms; }
.stagger-children > *:nth-child(2) { animation-delay: 120ms; }
.stagger-children > *:nth-child(3) { animation-delay: 180ms; }
.stagger-children > *:nth-child(4) { animation-delay: 240ms; }
.stagger-children > *:nth-child(5) { animation-delay: 300ms; }
.stagger-children > *:nth-child(6) { animation-delay: 360ms; }
.stagger-children > *:nth-child(7) { animation-delay: 420ms; }
.stagger-children > *:nth-child(8) { animation-delay: 480ms; }
.stagger-children > *:nth-child(9) { animation-delay: 540ms; }
.stagger-children > *:nth-child(10) { animation-delay: 600ms; }
.stagger-children > *:nth-child(11) { animation-delay: 660ms; }
.stagger-children > *:nth-child(12) { animation-delay: 720ms; }

/* Scroll-triggered animation (initially hidden, revealed by IntersectionObserver) */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity var(--duration-reveal) var(--ease-out-expo),
                transform var(--duration-reveal) var(--ease-out-expo);
}

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

/* Skeleton loading shimmer */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-surface-secondary) 25%,
        var(--color-surface-tertiary) 50%,
        var(--color-surface-secondary) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s var(--ease-out-quart) infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
    border-radius: var(--radius-sm);
}

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

/* Page-load animation — body.loaded triggers */
body:not(.loaded) .animate-on-load {
    opacity: 0;
    transform: translateY(12px);
}

body.loaded .animate-on-load {
    opacity: 1;
    transform: translateY(0);
    transition: opacity var(--duration-reveal) var(--ease-out-expo),
                transform var(--duration-reveal) var(--ease-out-expo);
}

/* ══════════════════════════════════════════════════════════
   MICRO-INTERACTIONS — Step 10 Polish
   ══════════════════════════════════════════════════════════ */

/* === Notification Bell Wiggle === */
@keyframes bellWiggle {
    0%   { transform: rotate(0deg); }
    10%  { transform: rotate(14deg); }
    20%  { transform: rotate(-12deg); }
    30%  { transform: rotate(10deg); }
    40%  { transform: rotate(-8deg); }
    50%  { transform: rotate(5deg); }
    60%  { transform: rotate(-3deg); }
    70%  { transform: rotate(1deg); }
    100% { transform: rotate(0deg); }
}

.pdks-bell-wiggle svg {
    animation: bellWiggle 0.8s var(--ease-out-expo);
    transform-origin: top center;
}

/* === Checkbox Row Flash === */
@keyframes rowFlash {
    0%   { background-color: var(--color-accent-primary-subtle); }
    100% { background-color: transparent; }
}

.pdks-row-flash {
    animation: rowFlash 0.6s var(--ease-out-expo);
}

/* === Input Focus Ring Expand === */
@keyframes focusRingExpand {
    0%   { box-shadow: 0 0 0 0 var(--color-accent-primary-subtle); }
    100% { box-shadow: 0 0 0 4px var(--color-accent-primary-subtle); }
}

.input-pdks-bordered:focus,
.form-control:focus,
.form-select:focus {
    animation: focusRingExpand var(--duration-normal) var(--ease-out-expo) forwards;
}

/* === Skeleton Row Fade In === */
@keyframes skeletonRowFadeIn {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.skeleton-row {
    animation: skeletonRowFadeIn 0.4s var(--ease-out-expo) both;
}

.skeleton-row td {
    padding: 14px 16px;
}

/* === Top Progress Bar === */
.pdks-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 9998;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--duration-fast) var(--ease-out-quart);
}

.pdks-progress-bar.is-active {
    opacity: 1;
}

.pdks-progress-bar__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-primary-hover), var(--color-accent-primary));
    background-size: 200% 100%;
    border-radius: 0 2px 2px 0;
    transition: width 0.3s var(--ease-out-expo), opacity 0.3s var(--ease-out-quart);
    box-shadow: 0 0 8px var(--color-accent-glow);
}

/* === Button Loading State === */
.btn-pdks-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
}

.btn-pdks-loading .pdks-btn-spinner {
    display: inline-block;
}

/* === Table Skeleton Wrapper === */
.table-pdks--skeleton {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.table-pdks--skeleton td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}

/* === Skip-to-Content Link === */
.pdks-skip-link {
    position: fixed;
    top: -100%;
    left: 16px;
    padding: 12px 24px;
    background-color: var(--color-accent-primary);
    color: var(--color-text-inverse);
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    z-index: 10000;
    text-decoration: none;
    transition: top var(--duration-fast) var(--ease-out-expo);
}

.pdks-skip-link:focus {
    top: 16px;
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
    color: var(--color-text-inverse);
}

/* 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;
    }

    .animate-on-scroll {
        opacity: 1;
        transform: none;
    }
}