/**
 * ============================================
 * RATIO-AI - Animazioni
 * ============================================
 * 
 * Animazioni CSS per transizioni fluide,
 * feedback visivi e micro-interazioni.
 */

/* ============================================
   KEYFRAME ANIMATIONS
   ============================================ */

/* Fade in */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Fade in up */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fade in down */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Slide in from right */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Slide in from left */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

/* Shake (per errori) */
@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(5px);
    }
}

/* Pulse */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* Glow pulse */
@keyframes glowPulse {
    0%, 100% {
        box-shadow: 0 0 5px rgba(99, 102, 241, 0.3);
    }
    50% {
        box-shadow: 0 0 20px rgba(99, 102, 241, 0.6);
    }
}

/* Ripple effect */
@keyframes ripple {
    0% {
        transform: scale(0);
        opacity: 1;
    }
    100% {
        transform: scale(2);
        opacity: 0;
    }
}

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

/* Check mark draw */
@keyframes drawCheck {
    0% {
        stroke-dashoffset: 100;
    }
    100% {
        stroke-dashoffset: 0;
    }
}

/* Progress fill */
@keyframes progressFill {
    from {
        width: 0%;
    }
}

/* Floating */
@keyframes floating {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Gradient shift */
@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* ============================================
   ANIMATION CLASSES
   ============================================ */

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

.animate-fadeInUp {
    animation: fadeInUp var(--transition-slow) ease-out;
}

.animate-fadeInDown {
    animation: fadeInDown var(--transition-slow) ease-out;
}

.animate-slideInRight {
    animation: slideInRight var(--transition-slow) ease-out;
}

.animate-slideInLeft {
    animation: slideInLeft var(--transition-slow) ease-out;
}

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

.animate-bounce {
    animation: bounce 1s ease-in-out infinite;
}

.animate-shake {
    animation: shake 0.5s ease-in-out;
}

.animate-pulse {
    animation: pulse 2s ease-in-out infinite;
}

.animate-spin {
    animation: spin 1s linear infinite;
}

.animate-float {
    animation: floating 3s ease-in-out infinite;
}

/* ============================================
   STAGGERED ANIMATIONS
   ============================================ */

.stagger-children > * {
    opacity: 0;
    animation: fadeInUp var(--transition-slow) ease-out forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 50ms; }
.stagger-children > *:nth-child(3) { animation-delay: 100ms; }
.stagger-children > *:nth-child(4) { animation-delay: 150ms; }
.stagger-children > *:nth-child(5) { animation-delay: 200ms; }
.stagger-children > *:nth-child(6) { animation-delay: 250ms; }
.stagger-children > *:nth-child(7) { animation-delay: 300ms; }
.stagger-children > *:nth-child(8) { animation-delay: 350ms; }
.stagger-children > *:nth-child(9) { animation-delay: 400ms; }
.stagger-children > *:nth-child(10) { animation-delay: 450ms; }

/* ============================================
   HOVER EFFECTS
   ============================================ */

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

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

/* Scale on hover */
.hover-scale {
    transition: transform var(--transition-base);
}

.hover-scale:hover {
    transform: scale(1.05);
}

/* Glow on hover */
.hover-glow {
    transition: box-shadow var(--transition-base);
}

.hover-glow:hover {
    box-shadow: var(--shadow-glow);
}

/* ============================================
   TRANSITION UTILITIES
   ============================================ */

.transition-none {
    transition: none !important;
}

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

.transition-fast {
    transition-duration: var(--transition-fast);
}

.transition-slow {
    transition-duration: var(--transition-slow);
}

/* ============================================
   INPUT FOCUS ANIMATIONS
   ============================================ */

.form-input,
.form-textarea,
.form-select {
    transition: 
        border-color var(--transition-base),
        background-color var(--transition-base),
        box-shadow var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    animation: glowPulse 2s ease-in-out infinite;
}

/* ============================================
   BUTTON ANIMATIONS
   ============================================ */

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

/* Ripple effect on click */
.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

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

/* Loading state */
.btn.loading {
    pointer-events: none;
    color: transparent;
}

.btn.loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ============================================
   CHECKBOX/RADIO ANIMATIONS
   ============================================ */

.checkbox-item,
.radio-item {
    transition: 
        background-color var(--transition-base),
        border-color var(--transition-base),
        transform var(--transition-fast);
}

.checkbox-item:active,
.radio-item:active {
    transform: scale(0.98);
}

.checkbox-custom,
.radio-custom {
    transition: 
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        transform var(--transition-fast);
}

.checkbox-item:hover .checkbox-custom,
.radio-item:hover .radio-custom {
    transform: scale(1.1);
}

.checkbox-item.selected .checkbox-custom,
.radio-item.selected .radio-custom {
    animation: scaleIn var(--transition-fast) ease-out;
}

/* ============================================
   SLIDE TRANSITIONS
   ============================================ */

.question-slide {
    transition: 
        opacity var(--transition-slow),
        transform var(--transition-slow),
        visibility var(--transition-slow);
}

/* Entering from right */
.question-slide.entering-right {
    opacity: 0;
    transform: translateX(50px);
}

/* Entering from left */
.question-slide.entering-left {
    opacity: 0;
    transform: translateX(-50px);
}

/* Exiting to left */
.question-slide.exiting-left {
    opacity: 0;
    transform: translateX(-50px);
}

/* Exiting to right */
.question-slide.exiting-right {
    opacity: 0;
    transform: translateX(50px);
}

/* ============================================
   VALIDATION ANIMATIONS
   ============================================ */

.form-input.error,
.form-textarea.error,
.form-select.error {
    animation: shake 0.5s ease-in-out;
}

.form-input.valid,
.form-textarea.valid,
.form-select.valid {
    animation: scaleIn 0.2s ease-out;
}

/* Error message appearance */
.error-message {
    transition: 
        opacity var(--transition-base),
        transform var(--transition-base);
}

.error-message.visible {
    animation: fadeInUp 0.3s ease-out;
}

/* ============================================
   SUCCESS ANIMATIONS
   ============================================ */

.success-checkmark {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: block;
    stroke-width: 2;
    stroke: var(--success-500);
    stroke-miterlimit: 10;
    margin: 0 auto;
    box-shadow: inset 0px 0px 0px var(--success-500);
    animation: fill 0.4s ease-in-out 0.4s forwards,
               scale 0.3s ease-in-out 0.9s both;
}

.success-checkmark__circle {
    stroke-dasharray: 166;
    stroke-dashoffset: 166;
    stroke-width: 2;
    stroke-miterlimit: 10;
    stroke: var(--success-500);
    fill: none;
    animation: stroke 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.success-checkmark__check {
    transform-origin: 50% 50%;
    stroke-dasharray: 48;
    stroke-dashoffset: 48;
    animation: stroke 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.8s forwards;
}

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

@keyframes fill {
    100% {
        box-shadow: inset 0px 0px 0px 30px rgba(16, 185, 129, 0.1);
    }
}

@keyframes scale {
    0%, 100% {
        transform: none;
    }
    50% {
        transform: scale3d(1.1, 1.1, 1);
    }
}

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

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .gradient-orb {
        animation: none;
    }
    
    .question-slide {
        transition: opacity 0.01ms;
        transform: none !important;
    }
}