/**
 * Bridge School — Motion publique (vitrine + portail)
 * Keyframes + classes utilitaires reveal/animation.
 * Dépendance : bridge-public-tokens.css
 *
 * Préfixe classes : .bpub-*
 * Activation : ajouter .bpub-reveal sur un élément → JS applique .is-visible
 */

/* ═══ KEYFRAMES ═══ */

@keyframes bpubFadeUp {
    from { opacity: 0; transform: translateY(28px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes bpubFadeDown {
    from { opacity: 0; transform: translateY(-20px); }
    to   { opacity: 1; transform: translateY(0); }
}

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

@keyframes bpubScaleIn {
    from { opacity: 0; transform: scale(0.92); }
    to   { opacity: 1; transform: scale(1); }
}

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

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

@keyframes bpubFloat {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-8px); }
}

@keyframes bpubPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50%      { transform: scale(1.04); opacity: 0.85; }
}

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

@keyframes bpubGradientShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes bpubCounterPulse {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.08); }
    100% { transform: scale(1); }
}

/* ═══ REVEAL CLASSES — inactive state ═══ */

.bpub-reveal {
    opacity: 0;
    transform: translateY(28px);
    transition:
        opacity var(--bpub-duration-slow) var(--bpub-ease-out),
        transform var(--bpub-duration-slow) var(--bpub-ease-out);
    will-change: opacity, transform;
}

.bpub-reveal--left {
    opacity: 0;
    transform: translateX(-40px);
    transition:
        opacity var(--bpub-duration-slow) var(--bpub-ease-out),
        transform var(--bpub-duration-slow) var(--bpub-ease-out);
    will-change: opacity, transform;
}

.bpub-reveal--right {
    opacity: 0;
    transform: translateX(40px);
    transition:
        opacity var(--bpub-duration-slow) var(--bpub-ease-out),
        transform var(--bpub-duration-slow) var(--bpub-ease-out);
    will-change: opacity, transform;
}

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

.bpub-reveal--down {
    opacity: 0;
    transform: translateY(-20px);
    transition:
        opacity var(--bpub-duration-mid) var(--bpub-ease-out),
        transform var(--bpub-duration-mid) var(--bpub-ease-out);
    will-change: opacity, transform;
}

/* ═══ REVEAL ACTIVE ═══ */

.bpub-reveal.is-visible,
.bpub-reveal--left.is-visible,
.bpub-reveal--right.is-visible,
.bpub-reveal--scale.is-visible,
.bpub-reveal--down.is-visible {
    opacity: 1;
    transform: translate(0, 0) scale(1);
    will-change: auto;
}

/* ═══ STAGGER (enfants d'un conteneur .bpub-stagger) ═══ */

.bpub-stagger > .bpub-reveal:nth-child(1) { transition-delay: 0ms; }
.bpub-stagger > .bpub-reveal:nth-child(2) { transition-delay: 80ms; }
.bpub-stagger > .bpub-reveal:nth-child(3) { transition-delay: 160ms; }
.bpub-stagger > .bpub-reveal:nth-child(4) { transition-delay: 240ms; }
.bpub-stagger > .bpub-reveal:nth-child(5) { transition-delay: 320ms; }
.bpub-stagger > .bpub-reveal:nth-child(6) { transition-delay: 400ms; }
.bpub-stagger > .bpub-reveal:nth-child(7) { transition-delay: 480ms; }
.bpub-stagger > .bpub-reveal:nth-child(8) { transition-delay: 560ms; }

/* ═══ UTILITAIRES HOVER ═══ */

.bpub-hover-lift {
    transition:
        transform var(--bpub-duration-fast) var(--bpub-ease-out),
        box-shadow var(--bpub-duration-fast) var(--bpub-ease-out);
}
.bpub-hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--bpub-shadow-lg);
}
.bpub-hover-lift:active {
    transform: translateY(-1px);
}

/* Tilt 3D léger (desktop) */
.bpub-hover-tilt {
    transition: transform var(--bpub-duration-fast) var(--bpub-ease-out);
    transform-style: preserve-3d;
    perspective: 800px;
}
@media (hover: hover) and (min-width: 769px) {
    .bpub-hover-tilt:hover {
        transform: perspective(800px) rotateX(2deg) rotateY(-2deg) translateY(-4px);
    }
}

/* ═══ FLOAT (icônes décoratives) ═══ */

.bpub-float {
    animation: bpubFloat 3s ease-in-out infinite;
}
.bpub-float--slow {
    animation: bpubFloat 5s ease-in-out infinite;
}

/* ═══ SHIMMER (skeleton placeholder) ═══ */

.bpub-shimmer {
    background: linear-gradient(
        90deg,
        var(--bpub-surface-warm) 25%,
        var(--bpub-surface-alt) 50%,
        var(--bpub-surface-warm) 75%
    );
    background-size: 400% 100%;
    animation: bpubShimmer 1.5s ease-in-out infinite;
}

/* ═══ GRADIENT MESH HERO (fond animé) ═══ */

.bpub-grad-mesh {
    background-size: 200% 200%;
    animation: bpubGradientShift 12s ease infinite;
}

/* ═══ PULSE CTA ═══ */

.bpub-pulse-cta {
    animation: bpubPulse 4s ease-in-out infinite;
}

/* ═══ COUNTER PULSE (post-count) ═══ */

.bpub-counter-done {
    animation: bpubCounterPulse 0.4s var(--bpub-ease-spring);
}

/* ═══ PREFERS-REDUCED-MOTION ═══ */

@media (prefers-reduced-motion: reduce) {
    .bpub-reveal,
    .bpub-reveal--left,
    .bpub-reveal--right,
    .bpub-reveal--scale,
    .bpub-reveal--down {
        opacity: 1;
        transform: none;
        transition: none;
        will-change: auto;
    }
    .bpub-float,
    .bpub-float--slow,
    .bpub-pulse-cta,
    .bpub-grad-mesh,
    .bpub-shimmer {
        animation: none;
    }
    .bpub-hover-lift:hover {
        transform: none;
    }
    .bpub-hover-tilt:hover {
        transform: none;
    }
}

/* ═══ PAGE LOADER (vitrine transition) ═══ */

.bs-page-loader {
    position: fixed;
    inset: 0;
    z-index: 999999;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f7fafc;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.45s cubic-bezier(0.4, 0, 0.2, 1),
                visibility 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}
.bs-page-loader.is-active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}
.bs-page-loader.is-leaving {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}
.bs-page-loader-glow {
    position: absolute;
    width: min(520px, 78vw);
    height: min(520px, 78vw);
    border-radius: 50%;
    background: radial-gradient(
        circle,
        rgba(0, 86, 179, 0.18) 0%,
        rgba(201, 162, 39, 0.1) 42%,
        transparent 70%
    );
    pointer-events: none;
}
.bs-page-loader-inner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0;
}
.bs-page-loader-stage {
    position: relative;
    width: 168px;
    height: 168px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.bs-page-loader-rings {
    position: absolute;
    inset: 0;
    pointer-events: none;
}
.bs-page-loader-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 3px solid transparent;
    box-sizing: border-box;
}
.bs-page-loader-ring--1 {
    inset: 0;
    border-top-color: #003566;
    border-right-color: rgba(0, 53, 102, 0.25);
    animation: bsPageLoaderSpin 1.1s linear infinite;
}
.bs-page-loader-ring--2 {
    inset: 10px;
    border-bottom-color: #0056b3;
    border-left-color: rgba(0, 86, 179, 0.2);
    animation: bsPageLoaderSpin 1.45s linear infinite reverse;
}
.bs-page-loader-ring--3 {
    inset: 20px;
    border-left-color: #c9a227;
    border-top-color: rgba(253, 230, 138, 0.55);
    animation: bsPageLoaderSpin 0.95s linear infinite;
}
@keyframes bsPageLoaderSpin {
    to { transform: rotate(360deg); }
}
.bs-page-loader-logo {
    position: relative;
    z-index: 2;
    width: 104px;
    height: 104px;
    border-radius: 50%;
    object-fit: contain;
    object-position: center;
    background: #fff;
    padding: 8px;
    box-shadow: 0 14px 36px rgba(10, 31, 53, 0.14);
}
.bs-page-loader-logo-ph {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 44px;
    line-height: 1;
}

@media (prefers-reduced-motion: reduce) {
    .bs-page-loader {
        transition: opacity 0.15s ease, visibility 0.15s ease;
    }
    .bs-page-loader-ring {
        animation: none !important;
        border-color: rgba(0, 53, 102, 0.2);
        border-top-color: #003566;
    }
}