/**
 * ANIMATIONS.CSS
 * Animations et transitions
 * Scroll reveals, hover effects, keyframes
 */

/* ============================================
   TRANSITIONS COMMUNES
   ============================================ */

.transition--all {
    transition: all var(--transition-base) var(--ease-out);
}

.transition--colors {
    transition: color var(--transition-fast) var(--ease-out),
                background-color var(--transition-fast) var(--ease-out),
                border-color var(--transition-fast) var(--ease-out);
}

.transition--transform {
    transition: transform var(--transition-base) var(--ease-out);
}

.transition--opacity {
    transition: opacity var(--transition-base) var(--ease-out);
}

/* ============================================
   SCROLL REVEAL ANIMATIONS
   ============================================ */

/* Classes ajoutées par JS via IntersectionObserver */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--ease-out),
                transform 0.6s var(--ease-out);
}

.reveal--active {
    opacity: 1;
    transform: translateY(0);
}

/* Variantes de direction */
.reveal--from-left {
    transform: translateX(-50px);
}

.reveal--from-right {
    transform: translateX(50px);
}

.reveal--from-left.reveal--active,
.reveal--from-right.reveal--active {
    transform: translateX(0);
}

/* Stagger delays pour listes */
.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }
.reveal--delay-5 { transition-delay: 0.5s; }

/* ============================================
   FADE ANIMATIONS
   ============================================ */

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

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

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

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

.fade-in {
    animation: fadeIn var(--transition-base) var(--ease-out);
}

.fade-out {
    animation: fadeOut var(--transition-base) var(--ease-out);
}

.fade-in-up {
    animation: fadeInUp var(--transition-base) var(--ease-out);
}

.fade-in-down {
    animation: fadeInDown var(--transition-base) var(--ease-out);
}

/* ============================================
   SLIDE ANIMATIONS
   ============================================ */

@keyframes slideInLeft {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideInUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.slide-in-left {
    animation: slideInLeft var(--transition-slow) var(--ease-out);
}

.slide-in-right {
    animation: slideInRight var(--transition-slow) var(--ease-out);
}

.slide-in-up {
    animation: slideInUp var(--transition-slow) var(--ease-out);
}

/* ============================================
   SCALE ANIMATIONS
   ============================================ */

@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes scaleOut {
    from {
        transform: scale(1);
        opacity: 1;
    }
    to {
        transform: scale(0.9);
        opacity: 0;
    }
}

.scale-in {
    animation: scaleIn var(--transition-base) var(--ease-out);
}

.scale-out {
    animation: scaleOut var(--transition-base) var(--ease-out);
}

/* ============================================
   BOUNCE EFFECT
   ============================================ */

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.bounce {
    animation: bounce 1s var(--ease-in-out);
}

/* ============================================
   SHAKE EFFECT (Error feedback)
   ============================================ */

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    20%, 60% {
        transform: translateX(-5px);
    }
    40%, 80% {
        transform: translateX(5px);
    }
}

.shake {
    animation: shake 0.5s var(--ease-in-out);
}

/* ============================================
   PULSE EFFECT
   ============================================ */

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.pulse {
    animation: pulse 2s var(--ease-in-out) infinite;
}

/* ============================================
   SPINNER (Loading)
   ============================================ */

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner--sm {
    width: 16px;
    height: 16px;
}

.spinner--lg {
    width: 32px;
    height: 32px;
}

/* ============================================
   HERO GRADIENT ANIMATION
   ============================================ */

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

.gradient-animate {
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
}

/* ============================================
   COUNTDOWN ANIMATION (pour stats)
   ============================================ */

@keyframes countUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.count-up {
    display: inline-block;
    animation: countUp 0.5s var(--ease-out);
}

/* ============================================
   CHECKMARK SUCCESS ANIMATION
   ============================================ */

@keyframes checkmark {
    0% {
        stroke-dashoffset: 100;
    }
    100% {
        stroke-dashoffset: 0;
    }
}

@keyframes checkmarkCircle {
    0% {
        stroke-dashoffset: 314;
    }
    100% {
        stroke-dashoffset: 0;
    }
}

.checkmark__circle {
    stroke-dasharray: 314;
    stroke-dashoffset: 314;
    animation: checkmarkCircle 0.6s var(--ease-out) forwards;
}

.checkmark__check {
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    animation: checkmark 0.4s var(--ease-out) 0.3s forwards;
}

/* ============================================
   LOADING SKELETON
   ============================================ */

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

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-bg-offset) 0%,
        var(--color-border-light) 50%,
        var(--color-bg-offset) 100%
    );
    background-size: 200% 100%;
    animation: skeletonShimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

.skeleton--text {
    height: 1em;
    margin-bottom: 0.5em;
}

.skeleton--title {
    height: 1.5em;
    width: 60%;
    margin-bottom: 1em;
}

.skeleton--image {
    aspect-ratio: 4 / 3;
    width: 100%;
}

.skeleton--avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

/* ============================================
   RIPPLE EFFECT (boutons material)
   ============================================ */

.ripple {
    position: relative;
    overflow: hidden;
}

.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 0.6s var(--ease-out),
                height 0.6s var(--ease-out);
}

.ripple:active::after {
    width: 300px;
    height: 300px;
}

/* ============================================
   GLITCH EFFECT (hover accent)
   ============================================ */

@keyframes glitch {
    0%, 100% {
        transform: translate(0);
    }
    20% {
        transform: translate(-2px, 2px);
    }
    40% {
        transform: translate(-2px, -2px);
    }
    60% {
        transform: translate(2px, 2px);
    }
    80% {
        transform: translate(2px, -2px);
    }
}

.glitch:hover {
    animation: glitch 0.3s var(--ease-in-out);
}

/* ============================================
   TYPING EFFECT
   ============================================ */

@keyframes typing {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

@keyframes blink {
    50% {
        border-color: transparent;
    }
}

.typing {
    display: inline-block;
    overflow: hidden;
    white-space: nowrap;
    border-right: 2px solid var(--color-accent);
    animation: typing 3s steps(40) 1s forwards,
               blink 0.75s step-end infinite;
}

/* ============================================
   CARD FLIP ANIMATION
   ============================================ */

.flip-card {
    perspective: 1000px;
}

.flip-card__inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flip-card:hover .flip-card__inner {
    transform: rotateY(180deg);
}

.flip-card__front,
.flip-card__back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}

.flip-card__back {
    transform: rotateY(180deg);
}

/* ============================================
   PROGRESS BAR ANIMATION
   ============================================ */

@keyframes progressFill {
    from {
        width: 0;
    }
}

.progress-bar {
    height: 8px;
    background-color: var(--color-bg-offset);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar__fill {
    height: 100%;
    background-color: var(--color-accent);
    border-radius: var(--radius-full);
    animation: progressFill 1s var(--ease-out) forwards;
}

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

@media (prefers-reduced-motion: reduce) {

    .reveal,
    .transition--all,
    .transition--colors,
    .transition--transform,
    .transition--opacity,
    .fade-in,
    .fade-out,
    .fade-in-up,
    .fade-in-down,
    .slide-in-left,
    .slide-in-right,
    .slide-in-up,
    .scale-in,
    .scale-out,
    .bounce,
    .shake,
    .pulse,
    .gradient-animate,
    .ripple:active::after,
    .flip-card:hover .flip-card__inner,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .spinner {
        animation: none;
        border-top-color: var(--color-accent);
    }

    .skeleton {
        animation: none;
        background: var(--color-bg-offset);
    }
}