/**
 * GitSniper Effects Library
 *
 * Shared CSS effects for animations, transitions, and micro-interactions.
 * Follows the design system defined in DESIGN.md.
 */

/* ==========================================================================
   CSS CUSTOM PROPERTIES
   ========================================================================== */

:root {
    /* Design system colours */
    --gs-primary-black: #0A0A0B;
    --gs-secondary-black: #1A1A1C;
    --gs-accent-black: #2A2A2D;
    --gs-border: #3A3A3D;
    --gs-hover: #58585B;
    --gs-text-primary: #E8E8E9;
    --gs-text-secondary: #A8A8AA;
    --gs-text-tertiary: #6B6B6D;
    --gs-success: #10B981;
    --gs-error: #DC2626;
    --gs-warning: #F59E0B;

    /* Animation timing */
    --gs-timing-fast: 0.2s;
    --gs-timing-standard: 0.3s;
    --gs-timing-slow: 0.4s;
    --gs-easing-primary: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --gs-easing-complex: cubic-bezier(0.4, 0, 0.2, 1);
}


/* ==========================================================================
   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;
        scroll-behavior: auto !important;
    }

    .particles-container,
    .particle {
        display: none !important;
    }

    .glow-band {
        animation: none !important;
        opacity: 0.7 !important;
    }

    .reveal {
        opacity: 1 !important;
        transform: none !important;
    }

    .hero-title .char {
        opacity: 1 !important;
        transform: none !important;
    }
}


/* ==========================================================================
   FLOATING PARTICLES
   ========================================================================== */

.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background-color: var(--gs-border);
    opacity: 0.2;
    animation: particle-drift var(--particle-duration, 20s) linear infinite;
    animation-delay: var(--particle-delay, 0s);
}

@keyframes particle-drift {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 0;
    }
    10% {
        opacity: 0.2;
    }
    90% {
        opacity: 0.2;
    }
    100% {
        transform: translate(
            var(--particle-x, 100px),
            var(--particle-y, -200px)
        ) scale(var(--particle-scale, 0.5));
        opacity: 0;
    }
}


/* ==========================================================================
   GRADIENT GLOW BREATHING
   ========================================================================== */

@keyframes glow-breathe {
    0%, 100% {
        opacity: 0.6;
    }
    50% {
        opacity: 0.8;
    }
}

.glow-band {
    animation: glow-breathe 8s var(--gs-easing-primary) infinite;
}


/* ==========================================================================
   NOISE TEXTURE OVERLAY
   ========================================================================== */

.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 1;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
}


/* ==========================================================================
   ENTRANCE ANIMATIONS
   ========================================================================== */

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

.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--gs-timing-slow) ease-out,
                transform var(--gs-timing-slow) ease-out;
}

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

.stagger-children > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--gs-timing-slow) ease-out,
                transform var(--gs-timing-slow) ease-out;
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.4s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.5s; }
.stagger-children.visible > *:nth-child(7) { transition-delay: 0.6s; }
.stagger-children.visible > *:nth-child(8) { transition-delay: 0.7s; }
.stagger-children.visible > *:nth-child(9) { transition-delay: 0.8s; }
.stagger-children.visible > *:nth-child(10) { transition-delay: 0.9s; }

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


/* ==========================================================================
   HERO TEXT CHARACTER ANIMATION
   ========================================================================== */

.hero-title .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(30px) rotateX(-20deg);
    animation: char-reveal var(--gs-timing-slow) var(--gs-easing-primary) forwards;
    animation-delay: var(--char-delay, 0s);
}

/* Mobile: disable character animation, show text immediately */
@media (max-width: 768px) {
    .hero-title .char {
        opacity: 1;
        transform: none;
        animation: none;
    }
}

@keyframes char-reveal {
    0% {
        opacity: 0;
        transform: translateY(30px) rotateX(-20deg);
    }
    60% {
        opacity: 1;
        transform: translateY(-5px) rotateX(5deg);
    }
    100% {
        opacity: 1;
        transform: translateY(0) rotateX(0deg);
    }
}


/* ==========================================================================
   INTERACTIVE MICRO-INTERACTIONS
   ========================================================================== */

/* Button glow effect */
.btn-glow {
    position: relative;
    transition: transform var(--gs-timing-fast) var(--gs-easing-primary),
                box-shadow var(--gs-timing-fast) var(--gs-easing-primary);
}

.btn-glow::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    background: linear-gradient(
        135deg,
        rgba(232, 232, 233, 0.1) 0%,
        rgba(232, 232, 233, 0.05) 50%,
        rgba(232, 232, 233, 0.1) 100%
    );
    opacity: 0;
    transition: opacity var(--gs-timing-fast) var(--gs-easing-primary);
    z-index: -1;
}

.btn-glow:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 20px rgba(232, 232, 233, 0.1);
}

.btn-glow:hover::before {
    opacity: 1;
}

/* Animated underline link */
.link-animated {
    position: relative;
    text-decoration: none;
}

.link-animated::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--gs-text-primary);
    transition: width var(--gs-timing-standard) var(--gs-easing-primary);
}

.link-animated:hover::after {
    width: 100%;
}

/* Card lift effect */
.card-lift {
    transition: transform var(--gs-timing-fast) var(--gs-easing-primary),
                box-shadow var(--gs-timing-fast) var(--gs-easing-primary);
}

.card-lift:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

/* Click ripple effect */
.ripple-container {
    position: relative;
    overflow: hidden;
}

.ripple {
    position: absolute;
    border-radius: 50%;
    background-color: rgba(232, 232, 233, 0.2);
    transform: scale(0);
    animation: ripple-effect 0.6s linear forwards;
    pointer-events: none;
}

@keyframes ripple-effect {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Accessible focus pulse - only hide outline for keyboard focus with custom ring */
.focus-pulse:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--gs-primary-black),
                0 0 0 4px var(--gs-text-primary);
    animation: focus-pulse-animation 2s var(--gs-easing-primary) infinite;
}

/* Infinite animation is intentional: only runs when element is focused,
   providing important accessibility feedback for keyboard users */
@keyframes focus-pulse-animation {
    0%, 100% {
        box-shadow: 0 0 0 2px var(--gs-primary-black),
                    0 0 0 4px var(--gs-text-primary);
    }
    50% {
        box-shadow: 0 0 0 2px var(--gs-primary-black),
                    0 0 0 6px rgba(232, 232, 233, 0.5);
    }
}


/* ==========================================================================
   PLATFORM BADGES
   ========================================================================== */

.platform-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    justify-content: center;
}

.platform-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background-color: var(--gs-secondary-black);
    border: 1px solid var(--gs-border);
    border-radius: 8px;
    color: var(--gs-text-secondary);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.3px;
    text-decoration: none;
    transition: background-color var(--gs-timing-fast) var(--gs-easing-primary),
                border-color var(--gs-timing-fast) var(--gs-easing-primary),
                color var(--gs-timing-fast) var(--gs-easing-primary),
                transform var(--gs-timing-fast) var(--gs-easing-primary);
}

.platform-badge svg,
.platform-badge img {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.platform-badge:hover {
    background-color: var(--gs-accent-black);
    border-color: var(--gs-hover);
    color: var(--gs-text-primary);
    transform: translateY(-2px);
}

.platform-badge:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--gs-primary-black),
                0 0 0 4px var(--gs-text-primary);
}

/* Footer platforms row */
.footer-platforms {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    justify-content: center;
    padding: 16px 0;
}

.footer-platforms .platform-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background-color: transparent;
    border: 1px solid var(--gs-border);
    color: var(--gs-text-tertiary);
    transition: background-color var(--gs-timing-fast) var(--gs-easing-primary),
                border-color var(--gs-timing-fast) var(--gs-easing-primary),
                color var(--gs-timing-fast) var(--gs-easing-primary);
}

.footer-platforms .platform-icon svg {
    width: 18px;
    height: 18px;
}

.footer-platforms .platform-icon:hover {
    background-color: var(--gs-secondary-black);
    border-color: var(--gs-hover);
    color: var(--gs-text-primary);
}