/* ============================================================
   HematoForum 2026 — Animations & Transitions
   ============================================================ */

/* ---------- Scroll Reveal (applied via JS IntersectionObserver) ---------- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.reveal-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.reveal-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.reveal-scale {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Stagger children */
.stagger-children>* {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-children.visible>*:nth-child(1) {
    transition-delay: 0.05s;
}

.stagger-children.visible>*:nth-child(2) {
    transition-delay: 0.1s;
}

.stagger-children.visible>*:nth-child(3) {
    transition-delay: 0.15s;
}

.stagger-children.visible>*:nth-child(4) {
    transition-delay: 0.2s;
}

.stagger-children.visible>*:nth-child(5) {
    transition-delay: 0.25s;
}

.stagger-children.visible>*:nth-child(6) {
    transition-delay: 0.3s;
}

.stagger-children.visible>*:nth-child(7) {
    transition-delay: 0.35s;
}

.stagger-children.visible>*:nth-child(8) {
    transition-delay: 0.4s;
}

.stagger-children.visible>* {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Hero title animation ---------- */
@keyframes hero-title-in {
    0% {
        opacity: 0;
        transform: translateY(30px);
        filter: blur(8px);
    }

    100% {
        opacity: 1;
        transform: translateY(0);
        filter: blur(0);
    }
}

.hero-animate-title {
    animation: hero-title-in 1s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.hero-animate-subtitle {
    animation: hero-title-in 1s cubic-bezier(0.22, 1, 0.36, 1) 0.15s forwards;
    opacity: 0;
}

.hero-animate-desc {
    animation: hero-title-in 1s cubic-bezier(0.22, 1, 0.36, 1) 0.3s forwards;
    opacity: 0;
}

.hero-animate-meta {
    animation: hero-title-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.45s forwards;
    opacity: 0;
}

.hero-animate-buttons {
    animation: hero-title-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.6s forwards;
    opacity: 0;
}

.hero-animate-countdown {
    animation: hero-title-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.75s forwards;
    opacity: 0;
}

.hero-animate-badge {
    animation: hero-title-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0s forwards;
    opacity: 0;
}

/* ---------- Countdown flip animation ---------- */
@keyframes flip-number {
    0% {
        transform: rotateX(0);
    }

    50% {
        transform: rotateX(-90deg);
        opacity: 0;
    }

    50.01% {
        transform: rotateX(90deg);
        opacity: 0;
    }

    100% {
        transform: rotateX(0);
        opacity: 1;
    }
}

.countdown-number.flip {
    animation: flip-number 0.5s ease-in-out;
}

/* ---------- Pulse animation for live dot ---------- */
@keyframes pulse-dot {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(220, 38, 38, 0.6);
    }

    50% {
        box-shadow: 0 0 0 6px rgba(220, 38, 38, 0);
    }
}

.hero-badge .dot {
    animation: blink 2s ease-in-out infinite, pulse-dot 2s ease-in-out infinite;
}

/* ---------- Card hover effects ---------- */
.speaker-card,
.section-card,
.sponsor-card,
.stat-card {
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
        box-shadow 0.35s ease,
        border-color 0.35s ease;
}

/* ---------- Button ripple effect ---------- */
.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--ripple-x, 50%) var(--ripple-y, 50%), rgba(255, 255, 255, 0.25) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.5s ease;
    border-radius: inherit;
    pointer-events: none;
}

.btn:active::after {
    opacity: 1;
    transition: opacity 0s;
}

/* ---------- Language switcher transition ---------- */
[data-lang-key] {
    transition: opacity 0.2s ease;
}

.lang-switching [data-lang-key] {
    opacity: 0;
}

/* ---------- Loading skeleton ---------- */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

.skeleton {
    background: linear-gradient(90deg,
            rgba(255, 255, 255, 0.04) 25%,
            rgba(255, 255, 255, 0.08) 50%,
            rgba(255, 255, 255, 0.04) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
}

/* ---------- Smooth scroll indicator ---------- */
@keyframes scroll-down {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(8px);
    }

    60% {
        transform: translateY(4px);
    }
}

/* ---------- Gradient border animation (for general sponsor) ---------- */
@keyframes border-glow {

    0%,
    100% {
        border-color: rgba(245, 158, 11, 0.4);
        box-shadow: 0 0 20px rgba(245, 158, 11, 0.1);
    }

    50% {
        border-color: rgba(245, 158, 11, 0.8);
        box-shadow: 0 0 40px rgba(245, 158, 11, 0.2);
    }
}

.sponsor-card-general {
    animation: border-glow 3s ease-in-out infinite;
}

/* ---------- Form focus animation ---------- */
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

/* ---------- Gallery hover zoom ---------- */
.gallery-item {
    transition: transform 0.3s ease;
}

.gallery-item:hover {
    transform: scale(1.02);
}

/* ---------- Nav link underline animation ---------- */
.nav-links a::after {
    transition: width 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Back to top button ---------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: var(--accent-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px);
    transition: all 0.3s ease;
    z-index: 900;
    box-shadow: 0 4px 15px rgba(220, 38, 38, 0.3);
    border: none;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(220, 38, 38, 0.45);
}