/* ==========================================================================
   Design System & Variable Declarations
   ========================================================================== */
:root {
    --bg-dark: #060913;
    --text-primary: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.4);
    
    --neon-cyan: #00f2fe;
    --neon-blue: #0070f3;
    --neon-purple: #c084fc;
    
    --font-outfit: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ==========================================================================
   Page Reset & General Layout
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-outfit);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
}

/* ==========================================================================
   Ambient Background Glow (模糊背景後方遊移效果)
   ========================================================================== */
.background-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    overflow: hidden;
}

.blob {
    position: absolute;
    width: 550px;
    height: 550px;
    border-radius: 50%;
    filter: blur(160px); /* 增加模糊值以達到非常溫柔、融和的效果 */
    opacity: 0.28;       /* 適當亮度 */
    mix-blend-mode: screen;
}

.blob-cyan {
    top: -10%;
    left: 15%;
    background: radial-gradient(circle, var(--neon-cyan) 0%, rgba(0,242,254,0) 70%);
    animation: driftBlob1 28s infinite alternate ease-in-out;
}

.blob-purple {
    bottom: -10%;
    right: 15%;
    background: radial-gradient(circle, var(--neon-purple) 0%, rgba(192,132,252,0) 70%);
    animation: driftBlob2 32s infinite alternate ease-in-out;
}

.blob-blue {
    top: 30%;
    right: 25%;
    background: radial-gradient(circle, var(--neon-blue) 0%, rgba(0,112,243,0) 70%);
    animation: driftBlob3 30s infinite alternate ease-in-out;
}

/* 慢速遊移關鍵影格 (Slow drifting animation) */
@keyframes driftBlob1 {
    0% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(150px, 80px) scale(1.1);
    }
    100% {
        transform: translate(50px, 180px) scale(0.9);
    }
}

@keyframes driftBlob2 {
    0% {
        transform: translate(0, 0) scale(0.9);
    }
    50% {
        transform: translate(-120px, -150px) scale(1.15);
    }
    100% {
        transform: translate(-50px, -50px) scale(1);
    }
}

@keyframes driftBlob3 {
    0% {
        transform: translate(0, 0) scale(1.1);
    }
    50% {
        transform: translate(-100px, 120px) scale(0.85);
    }
    100% {
        transform: translate(80px, -60px) scale(1);
    }
}

/* ==========================================================================
   Content Container (置中內容區)
   ========================================================================== */
.content-container {
    text-align: center;
    z-index: 10;
    pointer-events: none; /* 防止滑鼠選取影響視覺體驗 */
    user-select: none;
}

/* Glow Title */
.glow-title {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -2px;
    background: linear-gradient(135deg, #ffffff 40%, var(--neon-cyan) 85%, var(--neon-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 10px rgba(0, 242, 254, 0.15));
    animation: titlePulse 6s infinite alternate ease-in-out;
}

@keyframes titlePulse {
    0% {
        filter: drop-shadow(0 2px 10px rgba(0, 242, 254, 0.1));
        transform: scale(1);
    }
    100% {
        filter: drop-shadow(0 2px 20px rgba(192, 132, 252, 0.2));
        transform: scale(1.02);
    }
}

/* Subtitle */
.subtitle {
    font-size: clamp(0.8rem, 2vw, 1rem);
    font-weight: 600;
    letter-spacing: 6px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-top: 16px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.5));
}