/* ════════════════════════════════════════════════════════════════
   IMMERSIVE EXPERIENCE DESIGN - 沉浸式體驗設計
   ════════════════════════════════════════════════════════════════ */

/* 1. 動態背景粒子系統 */
.immersive-bg {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    background: linear-gradient(135deg, #08060e 0%, #1a0f2e 50%, #0d0620 100%);
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: radial-gradient(circle, rgba(255,255,255,0.8), rgba(255,255,255,0));
    border-radius: 50%;
    pointer-events: none;
    animation: float 20s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0) scale(1); opacity: 0; }
    10% { opacity: 1; }
    50% { opacity: 0.8; }
    90% { opacity: 0; }
}

/* 2. 視差滾動效果 */
.parallax-section {
    position: relative;
    overflow: hidden;
}

.parallax-layer {
    position: absolute;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    will-change: transform;
}

.parallax-layer.bg-1 {
    transform: translateZ(0);
}

.parallax-layer.bg-2 {
    transform: translateZ(-1px) scale(1.001);
}

.parallax-layer.bg-3 {
    transform: translateZ(-2px) scale(1.002);
}

/* 3. 滾動觸發動畫 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.34, 1.56, 0.64, 1),
                transform 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.scroll-reveal.stagger-1 { transition-delay: 0.1s; }
.scroll-reveal.stagger-2 { transition-delay: 0.2s; }
.scroll-reveal.stagger-3 { transition-delay: 0.3s; }
.scroll-reveal.stagger-4 { transition-delay: 0.4s; }

/* 4. 3D 深度感設計 */
.depth-card {
    position: relative;
    perspective: 1000px;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.23, 1, 0.320, 1);
}

.depth-card:hover {
    transform: rotateX(5deg) rotateY(-5deg) translateZ(20px);
}

.depth-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.1), transparent);
    border-radius: inherit;
    pointer-events: none;
}

/* 5. 流暢的轉場動畫 */
.page-transition {
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, #a855f7, #06b6d4);
    z-index: 9999;
    pointer-events: none;
    animation: slideOut 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes slideOut {
    0% {
        transform: translateX(0);
        opacity: 1;
    }
    100% {
        transform: translateX(100%);
        opacity: 0;
    }
}

@keyframes slideIn {
    0% {
        transform: translateX(-100%);
        opacity: 0;
    }
    100% {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 6. 互動式視覺回饋 */
.interactive-element {
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}

.interactive-element::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.2), transparent);
    border-radius: inherit;
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.4s ease;
    pointer-events: none;
}

.interactive-element:hover::after {
    opacity: 1;
    transform: scale(1.2);
}

.interactive-element:active {
    transform: scale(0.98);
}

/* 7. 漸變色彩動畫背景 */
.gradient-animate {
    background: linear-gradient(
        -45deg,
        #a855f7,
        #06b6d4,
        #ec4899,
        #a855f7
    );
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

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

/* 8. 音效視覺化 */
.sound-wave {
    display: inline-flex;
    gap: 3px;
    align-items: center;
}

.sound-bar {
    width: 3px;
    height: 12px;
    background: linear-gradient(180deg, #a855f7, #06b6d4);
    border-radius: 2px;
    animation: soundPulse 0.6s ease-in-out infinite;
}

.sound-bar:nth-child(1) { animation-delay: 0s; }
.sound-bar:nth-child(2) { animation-delay: 0.1s; }
.sound-bar:nth-child(3) { animation-delay: 0.2s; }
.sound-bar:nth-child(4) { animation-delay: 0.1s; }
.sound-bar:nth-child(5) { animation-delay: 0s; }

@keyframes soundPulse {
    0%, 100% { height: 12px; }
    50% { height: 24px; }
}

/* 9. 光暈效果 */
.glow-effect {
    position: relative;
}

.glow-effect::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.3), transparent);
    border-radius: inherit;
    filter: blur(8px);
    animation: glowPulse 3s ease-in-out infinite;
    pointer-events: none;
}

@keyframes glowPulse {
    0%, 100% {
        opacity: 0.5;
        filter: blur(8px);
    }
    50% {
        opacity: 1;
        filter: blur(12px);
    }
}

/* 10. 響應式設計 */
@media (max-width: 768px) {
    .depth-card:hover {
        transform: rotateX(2deg) rotateY(-2deg) translateZ(10px);
    }
    
    .parallax-layer.bg-2 {
        transform: translateZ(-0.5px) scale(1.0005);
    }
    
    .parallax-layer.bg-3 {
        transform: translateZ(-1px) scale(1.001);
    }
}

@media (prefers-reduced-motion: reduce) {
    .scroll-reveal,
    .depth-card,
    .particle,
    .sound-bar,
    .glow-effect::before {
        animation: none !important;
        transition: none !important;
    }
}