/* BiTA Premium Animations - Apple-Level Polish */

/* =================================
   KEYFRAMES - REFINED
   ================================= */

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.1);
    }
}

@keyframes gentle-glow {
    0%, 100% {
        opacity: 0.4;
        filter: blur(60px);
    }
    50% {
        opacity: 0.6;
        filter: blur(80px);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    25% {
        transform: translateY(-8px) rotate(1deg);
    }
    75% {
        transform: translateY(4px) rotate(-1deg);
    }
}

@keyframes subtle-bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-6px);
    }
}

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

/* Refined fade animations with Apple-like easing */
@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(60px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fade-in-scale {
    from {
        opacity: 0;
        transform: scale(0.92);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slide-in-left {
    from {
        opacity: 0;
        transform: translateX(-100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slide-in-right {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes blur-in {
    from {
        opacity: 0;
        filter: blur(20px);
        transform: scale(1.05);
    }
    to {
        opacity: 1;
        filter: blur(0);
        transform: scale(1);
    }
}

@keyframes reveal-up {
    from {
        clip-path: inset(100% 0 0 0);
        transform: translateY(20px);
    }
    to {
        clip-path: inset(0 0 0 0);
        transform: translateY(0);
    }
}

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

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

@keyframes draw-line {
    from {
        stroke-dashoffset: 1000;
    }
    to {
        stroke-dashoffset: 0;
    }
}

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

/* Particle float - more natural movement */
@keyframes particle-rise {
    0% {
        transform: translateY(0) translateX(0) scale(0);
        opacity: 0;
    }
    10% {
        opacity: 0.8;
        transform: translateY(-10vh) translateX(5px) scale(1);
    }
    90% {
        opacity: 0.6;
    }
    100% {
        transform: translateY(-100vh) translateX(-10px) scale(0.5);
        opacity: 0;
    }
}

/* Staggered letter animation */
@keyframes letter-fade-in {
    from {
        opacity: 0;
        transform: translateY(30px) rotateX(-90deg);
    }
    to {
        opacity: 1;
        transform: translateY(0) rotateX(0);
    }
}

/* =================================
   APPLE-STYLE EASING CURVES
   ================================= */

:root {
    /* Apple's signature easing curves */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-in-out-quint: cubic-bezier(0.83, 0, 0.17, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* =================================
   INITIAL ANIMATION STATES
   ================================= */

.animate-fade-in,
.animate-fade-in-up,
.animate-fade-in-scale,
.animate-blur-in,
.animate-slide-left,
.animate-slide-right {
    opacity: 0;
}

/* =================================
   ANIMATION TRIGGERS
   ================================= */

.animate-fade-in {
    animation: fade-in 1s var(--ease-out-expo) forwards;
}

.animate-fade-in-up {
    animation: fade-in-up 1.2s var(--ease-out-expo) forwards;
}

.animate-fade-in-scale {
    animation: fade-in-scale 1s var(--ease-out-expo) forwards;
}

.animate-blur-in {
    animation: blur-in 1.4s var(--ease-out-expo) forwards;
}

.animate-slide-left {
    animation: slide-in-left 1.2s var(--ease-out-expo) forwards;
}

.animate-slide-right {
    animation: slide-in-right 1.2s var(--ease-out-expo) forwards;
}

/* Staggered delays - refined timing */
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.35s; }
.delay-4 { animation-delay: 0.5s; }
.delay-5 { animation-delay: 0.7s; }
.delay-6 { animation-delay: 0.9s; }

/* =================================
   SCROLL-TRIGGERED ANIMATIONS
   ================================= */

.animate-on-scroll {
    opacity: 0;
    transform: translateY(80px);
    transition: 
        opacity 0.9s var(--ease-out-expo),
        transform 0.9s var(--ease-out-expo);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Scale variant */
.animate-on-scroll.scale-in {
    transform: translateY(40px) scale(0.95);
}

.animate-on-scroll.scale-in.visible {
    transform: translateY(0) scale(1);
}

/* Blur variant */
.animate-on-scroll.blur-in {
    filter: blur(10px);
    transform: translateY(60px) scale(1.02);
}

.animate-on-scroll.blur-in.visible {
    filter: blur(0);
    transform: translateY(0) scale(1);
}

/* Stagger delays for grids */
.animate-on-scroll[data-delay="0"] { transition-delay: 0s; }
.animate-on-scroll[data-delay="100"] { transition-delay: 0.1s; }
.animate-on-scroll[data-delay="150"] { transition-delay: 0.15s; }
.animate-on-scroll[data-delay="200"] { transition-delay: 0.2s; }
.animate-on-scroll[data-delay="300"] { transition-delay: 0.3s; }
.animate-on-scroll[data-delay="400"] { transition-delay: 0.4s; }
.animate-on-scroll[data-delay="500"] { transition-delay: 0.5s; }

/* =================================
   HOVER MICRO-INTERACTIONS
   ================================= */

/* Subtle lift */
.hover-lift {
    transition: transform 0.4s var(--ease-out-expo);
}

.hover-lift:hover {
    transform: translateY(-6px);
}

/* Magnetic effect (cards) */
.hover-magnetic {
    transition: transform 0.3s var(--ease-out-expo);
}

/* Scale with spring */
.hover-scale {
    transition: transform 0.4s var(--ease-spring);
}

.hover-scale:hover {
    transform: scale(1.03);
}

/* Glow on hover */
.hover-glow {
    position: relative;
}

.hover-glow::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--color-accent), transparent);
    border-radius: inherit;
    opacity: 0;
    z-index: -1;
    transition: opacity 0.4s var(--ease-smooth);
    filter: blur(15px);
}

.hover-glow:hover::before {
    opacity: 0.5;
}

/* Link underline animation */
.hover-underline {
    position: relative;
}

.hover-underline::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s var(--ease-out-expo);
}

.hover-underline:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* =================================
   BUTTON MICRO-INTERACTIONS
   ================================= */

/* Ripple effect on click */
.btn {
    position: relative;
    overflow: hidden;
}

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

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

/* Icon arrow animation */
.btn-icon {
    transition: transform 0.3s var(--ease-spring);
}

.btn:hover .btn-icon {
    transform: translateX(6px);
}

/* =================================
   LOADING STATES
   ================================= */

.loading-skeleton {
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.05) 0%,
        rgba(255, 255, 255, 0.1) 50%,
        rgba(255, 255, 255, 0.05) 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-lg);
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 2px solid rgba(255, 193, 7, 0.2);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* =================================
   SCROLL INDICATOR
   ================================= */

.scroll-indicator {
    animation: subtle-bounce 2s var(--ease-in-out-quint) infinite;
}

/* =================================
   TEXT ANIMATIONS
   ================================= */

/* Gradient text animation */
.text-gradient-animated {
    background: linear-gradient(
        90deg,
        var(--color-accent) 0%,
        var(--color-accent-light) 25%,
        var(--color-accent) 50%,
        var(--color-accent-light) 75%,
        var(--color-accent) 100%
    );
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 4s linear infinite;
}

/* Character by character reveal (JS-controlled) */
.char-reveal .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s var(--ease-out-expo), transform 0.5s var(--ease-out-expo);
}

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

/* =================================
   PARALLAX UTILS
   ================================= */

.parallax-slow {
    will-change: transform;
}

.parallax-medium {
    will-change: transform;
}

.parallax-fast {
    will-change: transform;
}

/* =================================
   CURSOR EFFECTS (Optional)
   ================================= */

.cursor-glow {
    position: fixed;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 193, 7, 0.08) 0%, transparent 70%);
    pointer-events: none;
    transform: translate(-50%, -50%);
    z-index: 0;
    transition: opacity 0.3s;
    filter: blur(30px);
}

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

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .animate-on-scroll,
    .animate-fade-in,
    .animate-fade-in-up {
        opacity: 1;
        transform: none;
        filter: none;
    }
    
    .cursor-glow {
        display: none;
    }
}