/* ============================================
   OrthoAlign Rehab — Animations
   Tasteful, Performant, Accessible
   ============================================ */

/* ----------------------------------------
   KEYFRAME DEFINITIONS
   ---------------------------------------- */

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
        padding-top: 0;
        padding-bottom: 0;
    }
    to {
        opacity: 1;
        max-height: 500px;
        padding-top: var(--space-4);
        padding-bottom: var(--space-4);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

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

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

@keyframes ripple {
    0% {
        transform: scale(0);
        opacity: 0.4;
    }
    100% {
        transform: scale(4);
        opacity: 0;
    }
}

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

@keyframes borderGlow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(24, 99, 220, 0.15);
    }
    50% {
        box-shadow: 0 0 30px rgba(24, 99, 220, 0.3);
    }
}

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

@keyframes drawLine {
    from { height: 0; }
    to { height: 100%; }
}

/* ----------------------------------------
   SCROLL REVEAL SYSTEM
   Elements start hidden, revealed by JS
   ---------------------------------------- */

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1),
                transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
    will-change: opacity, transform;
}

.reveal--left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1),
                transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
    will-change: opacity, transform;
}

.reveal--right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1),
                transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
    will-change: opacity, transform;
}

.reveal--scale {
    opacity: 0;
    transform: scale(0.92);
    transition: opacity 0.7s cubic-bezier(0.23, 1, 0.32, 1),
                transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
    will-change: opacity, transform;
}

/* Active state (revealed) */
.reveal.is-visible,
.reveal--left.is-visible,
.reveal--right.is-visible,
.reveal--scale.is-visible {
    opacity: 1;
    transform: translateY(0) translateX(0) scale(1);
}

/* Stagger delays for grid children */
.stagger-1 { transition-delay: 0.05s; }
.stagger-2 { transition-delay: 0.1s; }
.stagger-3 { transition-delay: 0.15s; }
.stagger-4 { transition-delay: 0.2s; }
.stagger-5 { transition-delay: 0.25s; }
.stagger-6 { transition-delay: 0.3s; }
.stagger-7 { transition-delay: 0.35s; }
.stagger-8 { transition-delay: 0.4s; }
.stagger-9 { transition-delay: 0.45s; }
.stagger-10 { transition-delay: 0.5s; }
.stagger-11 { transition-delay: 0.55s; }
.stagger-12 { transition-delay: 0.6s; }

/* ----------------------------------------
   COMPONENT ANIMATIONS
   ---------------------------------------- */

/* Card hover lift */
.hover-lift {
    transition: transform var(--transition-base),
                box-shadow var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}

/* Button ripple effect */
.btn-ripple {
    position: relative;
    overflow: hidden;
}

.btn-ripple .ripple-circle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    animation: ripple 0.6s ease-out forwards;
    pointer-events: none;
}

/* Floating badge animation */
.float-animation {
    animation: float 3s ease-in-out infinite;
}

/* Pulse for badges / live indicators */
.pulse-animation {
    animation: pulse 2s ease-in-out infinite;
}

/* Glow effect for pricing card */
.glow-animation {
    animation: borderGlow 3s ease-in-out infinite;
}

/* Loading spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
}

/* ----------------------------------------
   ACCORDION ANIMATION
   ---------------------------------------- */
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.23, 1, 0.32, 1),
                padding 0.4s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.3s ease;
    opacity: 0;
}

.accordion-item.is-open .accordion-content {
    opacity: 1;
}

/* Accordion chevron rotation */
.accordion-icon {
    transition: transform var(--transition-base);
}

.accordion-item.is-open .accordion-icon {
    transform: rotate(180deg);
}

/* ----------------------------------------
   MODAL ANIMATION
   ---------------------------------------- */
.modal-backdrop {
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base),
                visibility var(--transition-base);
}

.modal-backdrop.is-active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    opacity: 0;
    transform: translateY(20px) scale(0.97);
    transition: opacity var(--transition-base),
                transform var(--transition-spring);
}

.modal-backdrop.is-active .modal-content {
    opacity: 1;
    transform: translateY(0) scale(1);
}

/* ----------------------------------------
   NAV ANIMATIONS
   ---------------------------------------- */
.nav-scrolled {
    background: var(--glass-bg) !important;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--glass-border);
}

/* Hamburger animation */
.hamburger-line {
    transition: transform var(--transition-base),
                opacity var(--transition-fast);
}

.hamburger.is-active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.is-active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.is-active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile drawer */
.mobile-drawer {
    transform: translateX(100%);
    transition: transform var(--transition-smooth);
}

.mobile-drawer.is-open {
    transform: translateX(0);
}

/* ----------------------------------------
   COUNTER ANIMATION
   ---------------------------------------- */
.counter-value {
    display: inline-block;
    animation: countUp 0.5s ease-out forwards;
}

/* ----------------------------------------
   TIMELINE ANIMATION
   ---------------------------------------- */
.timeline-line {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: var(--gradient-brand);
    animation: drawLine 1.5s ease-out forwards;
}

/* ----------------------------------------
   PREFERS REDUCED MOTION OVERRIDE
   ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    .reveal,
    .reveal--left,
    .reveal--right,
    .reveal--scale {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .hover-lift:hover {
        transform: none;
    }

    .float-animation,
    .pulse-animation,
    .glow-animation {
        animation: none;
    }

    .accordion-content {
        transition: none;
    }

    .modal-backdrop,
    .modal-content {
        transition: none;
    }

    .mobile-drawer {
        transition: none;
    }
}