/* ./css/animations.css
 * Smooth animations and transitions for the Slow Build Check-In questionnaire.
 * 
 * Includes page transitions, hover effects, micro-animations, and loading states.
 * Designed to feel gentle and calming, never jarring or overwhelming.
 * 
 * Dependencies: variables.css must be loaded first.
 */

/* ========================================
   Keyframe Animations
   ======================================== */

/* Gentle fade in */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fade in with scale */
@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Gentle pulse */
@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

/* Soft bounce */
@keyframes softBounce {

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

    50% {
        transform: translateY(-5px);
    }
}

/* Heart beat */
@keyframes heartbeat {

    0%,
    100% {
        transform: scale(1);
    }

    25% {
        transform: scale(1.1);
    }

    50% {
        transform: scale(1);
    }

    75% {
        transform: scale(1.1);
    }
}

/* Shimmer loading effect */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

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

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

    to {
        transform: rotate(360deg);
    }
}

/* Float */
@keyframes float {

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

    50% {
        transform: translateY(-10px);
    }
}

/* Check mark draw */
@keyframes checkDraw {
    0% {
        stroke-dashoffset: 24;
    }

    100% {
        stroke-dashoffset: 0;
    }
}

/* ========================================
   Animation Utility Classes
   ======================================== */
.animate-fadeIn {
    animation: fadeIn var(--transition-normal) ease forwards;
}

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

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

.animate-fadeInScale {
    animation: fadeInScale var(--transition-slow) ease forwards;
}

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

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

.animate-heartbeat {
    animation: heartbeat 1.5s ease-in-out infinite;
}

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

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

/* ========================================
   Page Transitions
   ======================================== */
.page {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow) ease,
        transform var(--transition-slow) ease;
}

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

.page.exit {
    opacity: 0;
    transform: translateY(-20px);
}

/* ========================================
   Question Card Transitions
   ======================================== */
.question-card {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity var(--transition-slow) ease,
        transform var(--transition-slow) ease;
}

.question-card.active {
    opacity: 1;
    transform: translateX(0);
}

.question-card.exit-left {
    opacity: 0;
    transform: translateX(-30px);
}

.question-card.exit-right {
    opacity: 0;
    transform: translateX(30px);
}

/* Staggered entrance for options - ensure visibility after animation */
.question-options .checkbox-wrapper,
.question-options .radio-wrapper {
    animation: fadeInUp var(--transition-normal) ease both;
}

.question-options .checkbox-wrapper:nth-child(1),
.question-options .radio-wrapper:nth-child(1) {
    animation-delay: 0.05s;
}

.question-options .checkbox-wrapper:nth-child(2),
.question-options .radio-wrapper:nth-child(2) {
    animation-delay: 0.1s;
}

.question-options .checkbox-wrapper:nth-child(3),
.question-options .radio-wrapper:nth-child(3) {
    animation-delay: 0.15s;
}

.question-options .checkbox-wrapper:nth-child(4),
.question-options .radio-wrapper:nth-child(4) {
    animation-delay: 0.2s;
}

.question-options .checkbox-wrapper:nth-child(5),
.question-options .radio-wrapper:nth-child(5) {
    animation-delay: 0.25s;
}

.question-options .checkbox-wrapper:nth-child(6),
.question-options .radio-wrapper:nth-child(6) {
    animation-delay: 0.3s;
}

.question-options .checkbox-wrapper:nth-child(7),
.question-options .radio-wrapper:nth-child(7) {
    animation-delay: 0.35s;
}

/* ========================================
   Button Interactions
   ======================================== */
.btn {
    position: relative;
    overflow: hidden;
}

/* Ripple effect */
.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
}

.btn:active::after {
    width: 200px;
    height: 200px;
    opacity: 1;
    transition: width 0.3s ease, height 0.3s ease, opacity 0.5s ease;
}

/* ========================================
   Checkbox/Radio Animations
   ======================================== */
.checkbox-custom,
.radio-custom {
    transition: all var(--transition-fast);
}

.checkbox-input:checked+.checkbox-custom,
.radio-input:checked+.radio-custom {
    animation: fadeInScale var(--transition-fast) ease;
}

/* Selection pop */
.checkbox-wrapper:active .checkbox-custom,
.radio-wrapper:active .radio-custom {
    transform: scale(0.9);
}

/* ========================================
   Progress Bar Animation
   ======================================== */
.progress-fill {
    transition: width var(--transition-slow) cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ========================================
   Card Hover Effects
   ======================================== */
.card {
    transition: transform var(--transition-normal) ease,
        box-shadow var(--transition-normal) ease;
}

.card:hover {
    transform: translateY(-4px);
}

/* ========================================
   Loading States
   ======================================== */
.skeleton {
    background: linear-gradient(90deg,
            var(--color-bg-hover) 0%,
            var(--color-bg-elevated) 50%,
            var(--color-bg-hover) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ========================================
   Theme Transition
   ======================================== */
body,
.card,
.btn,
.input,
.progress-bar {
    transition: background-color var(--transition-normal) ease,
        border-color var(--transition-normal) ease,
        color var(--transition-normal) ease;
}

/* Theme Switch Animation - Elegant Bloom Effect */
@keyframes themeBloom {
    0% {
        opacity: 1;
        transform: scale(1);
    }

    40% {
        opacity: 0.92;
        transform: scale(1.005);
    }

    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes themeFadeShift {
    0% {
        filter: brightness(1) saturate(1);
    }

    30% {
        filter: brightness(1.03) saturate(0.95);
    }

    100% {
        filter: brightness(1) saturate(1);
    }
}

/* Theme transitioning state */
body.theme-transitioning {
    animation: themeBloom 400ms ease-out, themeFadeShift 400ms ease-out;
}

body.theme-transitioning .card,
body.theme-transitioning .btn:not(.nav-restart),
body.theme-transitioning .nav {
    animation: themeBloom 400ms ease-out;
}

/* Subtle glow pulse on theme toggle button during switch */
body.theme-transitioning .theme-toggle {
    animation: pulse 300ms ease-in-out;
}

/* ========================================
   Success Animation
   ======================================== */
.success-icon {
    width: 48px;
    height: 48px;
    background: var(--color-success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeInScale var(--transition-slow) ease;
}

.success-icon svg {
    stroke: white;
    stroke-width: 3;
    stroke-dasharray: 24;
    animation: checkDraw 0.4s ease 0.2s forwards;
}

/* ========================================
   Hover Lift Effect
   ======================================== */
.hover-lift {
    transition: transform var(--transition-normal) ease,
        box-shadow var(--transition-normal) ease;
}

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

/* ========================================
   Reduced Motion Support
   ======================================== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .page,
    .question-card {
        opacity: 1;
        transform: none;
    }
}