/* ============================================
   SAO (Sword Art Online) Animations & Effects
   ============================================ */

/* --- Keyframe Animations --- */

@keyframes saoGlow {
    0%, 100% { box-shadow: 0 0 4px rgba(196, 165, 90, 0.06); }
    50% { box-shadow: 0 0 8px rgba(196, 165, 90, 0.1); }
}

@keyframes saoGlowCyan {
    0%, 100% { box-shadow: 0 0 4px rgba(136, 175, 196, 0.06); }
    50% { box-shadow: 0 0 8px rgba(136, 175, 196, 0.1); }
}

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

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

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

@keyframes saoFadeInUp {
    from { opacity: 0; transform: translateY(40px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes saoSlideDown {
    from { opacity: 0; transform: translateY(-15px); }
    to { opacity: 1; transform: translateY(0); }
}

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

@keyframes saoScanLine {
    0% { top: -5%; }
    100% { top: 105%; }
}

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

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

@keyframes saoRotateGlow {
    0% { filter: hue-rotate(0deg); }
    100% { filter: hue-rotate(360deg); }
}

@keyframes saoBorderDraw {
    0% { clip-path: polygon(0 0, 0 0, 0 100%, 0 100%); }
    25% { clip-path: polygon(0 0, 100% 0, 100% 0, 0 100%); }
    50% { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); }
    100% { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); }
}

@keyframes saoFlicker {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.85; }
    75% { opacity: 0.95; }
}

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

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

@keyframes saoMenuExpand {
    from { width: 48px; opacity: 0.8; }
    to { width: var(--expanded-width, 160px); opacity: 1; }
}

@keyframes saoTitleReveal {
    0% { clip-path: inset(0 100% 0 0); opacity: 0; }
    100% { clip-path: inset(0 0 0 0); opacity: 1; }
}

@keyframes saoParticleFloat {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 0.35; }
    90% { opacity: 0.35; }
    100% { transform: translateY(-10vh) rotate(360deg); opacity: 0; }
}

@keyframes saoRingPulse {
    0% { transform: scale(0.8); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
    100% { transform: scale(0.8); opacity: 0.5; }
}

@keyframes saoGlitch {
    0%, 100% { transform: translate(0); }
    20% { transform: translate(-2px, 2px); }
    40% { transform: translate(2px, -2px); }
    60% { transform: translate(-1px, 1px); }
    80% { transform: translate(1px, -1px); }
}

@keyframes saoCountUp {
    from { opacity: 0; transform: scale(0.5); }
    to { opacity: 1; transform: scale(1); }
}

/* --- Particle System (CSS-only) --- */

.sao-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.sao-particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--sao-gold);
    border-radius: 50%;
    animation: saoParticleFloat linear infinite;
    opacity: 0;
    filter: blur(0.5px);
}

.sao-particle:nth-child(1) { left: 5%; animation-duration: 20s; animation-delay: 0s; width: 1px; height: 1px; }
.sao-particle:nth-child(2) { left: 15%; animation-duration: 24s; animation-delay: 3s; width: 2px; height: 2px; }
.sao-particle:nth-child(3) { left: 25%; animation-duration: 18s; animation-delay: 6s; }
.sao-particle:nth-child(4) { left: 35%; animation-duration: 26s; animation-delay: 2s; width: 1px; height: 1px; }
.sao-particle:nth-child(5) { left: 45%; animation-duration: 22s; animation-delay: 5s; }
.sao-particle:nth-child(6) { left: 55%; animation-duration: 19s; animation-delay: 7s; width: 1px; height: 1px; }
.sao-particle:nth-child(7) { left: 65%; animation-duration: 28s; animation-delay: 1s; }
.sao-particle:nth-child(8) { left: 75%; animation-duration: 23s; animation-delay: 4s; width: 2px; height: 2px; }
.sao-particle:nth-child(9) { left: 85%; animation-duration: 25s; animation-delay: 6.5s; }
.sao-particle:nth-child(10) { left: 92%; animation-duration: 20s; animation-delay: 2.5s; width: 1px; height: 1px; }

/* --- SAO Scan Line Effect --- */

.sao-scanline {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(136, 175, 196, 0.04), transparent);
    z-index: 9998;
    pointer-events: none;
    animation: saoScanLine 12s linear infinite;
}

/* --- SAO Hexagonal Grid Background --- */

.sao-hex-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    opacity: 0.015;
    background-image: 
        linear-gradient(30deg, var(--sao-gold) 12%, transparent 12.5%, transparent 87%, var(--sao-gold) 87.5%, var(--sao-gold)),
        linear-gradient(150deg, var(--sao-gold) 12%, transparent 12.5%, transparent 87%, var(--sao-gold) 87.5%, var(--sao-gold)),
        linear-gradient(30deg, var(--sao-gold) 12%, transparent 12.5%, transparent 87%, var(--sao-gold) 87.5%, var(--sao-gold)),
        linear-gradient(150deg, var(--sao-gold) 12%, transparent 12.5%, transparent 87%, var(--sao-gold) 87.5%, var(--sao-gold)),
        linear-gradient(60deg, rgba(196, 165, 90, 0.25) 25%, transparent 25.5%, transparent 75%, rgba(196, 165, 90, 0.25) 75%, rgba(196, 165, 90, 0.25)),
        linear-gradient(60deg, rgba(196, 165, 90, 0.25) 25%, transparent 25.5%, transparent 75%, rgba(196, 165, 90, 0.25) 75%, rgba(196, 165, 90, 0.25));
    background-size: 60px 104px;
    background-position: 0 0, 0 0, 30px 52px, 30px 52px, 0 0, 30px 52px;
}

/* --- Scroll-triggered Reveal Classes --- */

.sao-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.sao-reveal-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.sao-reveal-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.sao-reveal-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.sao-reveal-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Stagger delays for grid children */
.sao-stagger > *:nth-child(1) { transition-delay: 0s; }
.sao-stagger > *:nth-child(2) { transition-delay: 0.1s; }
.sao-stagger > *:nth-child(3) { transition-delay: 0.2s; }
.sao-stagger > *:nth-child(4) { transition-delay: 0.3s; }
.sao-stagger > *:nth-child(5) { transition-delay: 0.4s; }
.sao-stagger > *:nth-child(6) { transition-delay: 0.5s; }

/* --- SAO Panel / Card Base Style --- */

.sao-panel {
    background: linear-gradient(145deg, rgba(15, 20, 40, 0.85), rgba(8, 12, 28, 0.95));
    border: 1px solid rgba(196, 165, 90, 0.08);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.sao-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--sao-gold), transparent);
    opacity: 0.25;
}

.sao-panel::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(136, 175, 196, 0.06), transparent);
}

/* --- SAO Corner Decorations --- */

.sao-corners {
    position: relative;
}

.sao-corners::before,
.sao-corners::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border-color: var(--sao-gold);
    border-style: solid;
    opacity: 0.2;
    pointer-events: none;
}

.sao-corners::before {
    top: -1px;
    left: -1px;
    border-width: 2px 0 0 2px;
}

.sao-corners::after {
    bottom: -1px;
    right: -1px;
    border-width: 0 2px 2px 0;
}

/* --- SAO Divider --- */

.sao-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--sao-gold), transparent);
    margin: 2rem 0;
    opacity: 0.15;
    position: relative;
}

.sao-divider::after {
    content: '◆';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--sao-gold);
    font-size: 10px;
    background: var(--sao-bg-deep);
    padding: 0 10px;
}

/* --- SAO Loading Spinner --- */

.sao-loader {
    width: 50px;
    height: 50px;
    border: 2px solid rgba(196, 165, 90, 0.05);
    border-top: 2px solid var(--sao-gold);
    border-radius: 50%;
    animation: saoHexRotate 1s linear infinite;
    position: relative;
}

.sao-loader::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    right: 3px;
    bottom: 3px;
    border: 2px solid rgba(136, 175, 196, 0.05);
    border-bottom: 2px solid var(--sao-cyan);
    border-radius: 50%;
    animation: saoHexRotate 0.6s linear infinite reverse;
}

/* --- Respect reduced motion --- */

@media (prefers-reduced-motion: reduce) {
    .sao-particles,
    .sao-scanline {
        display: none !important;
    }
    
    .sao-reveal,
    .sao-reveal-left,
    .sao-reveal-right {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }
    
    .sao-panel::before,
    .sao-panel::after {
        animation: none !important;
    }
}

/* --- Mobile optimizations --- */

@media (max-width: 768px) {
    .sao-particles {
        display: none;
    }
    
    .sao-hex-bg {
        opacity: 0.015;
    }
    
    .sao-scanline {
        animation-duration: 12s;
    }
}