\coming-soon.css
:root {
    --primary-bg: #0f0f0f;
    --secondary-bg: #1a1a1a;
    --accent-bg: #2a2a2a;
    --border-color: #3a3a3a;
    --primary-text: #ffffff;
    --secondary-text: #a0a0a0;
    --accent-color: #808080;
    --accent-hover: #999999;
    --gradient-primary: linear-gradient(135deg, #404040, #606060);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--primary-bg);
    color: var(--primary-text);
    overflow: hidden;
    height: 100vh;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    position: relative;
    background: var(--primary-bg);
}

.content {
    text-align: center;
    max-width: 500px;
    padding: 60px 40px;
    background: var(--secondary-bg);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-heavy);
    position: relative;
    z-index: 10;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.icon {
    font-size: 4rem;
    margin-bottom: 2rem;
    animation: bounce 2s infinite;
    color: var(--accent-color);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

p {
    font-size: 1.2rem;
    color: var(--secondary-text);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--accent-bg);
    border-radius: 4px;
    margin: 2rem 0 1rem;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    width: 65%;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    animation: progressMove 3s ease-in-out infinite;
}

@keyframes progressMove {
    0%, 100% {
        transform: translateX(0);
    }
    50% {
        transform: translateX(5px);
    }
}

.progress-text {
    font-size: 1rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 2rem;
}

.back-link {
    margin-top: 3rem;
}

.back-button {
    background: var(--gradient-primary);
    color: white;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-block;
    position: relative;
    overflow: hidden;
}

.back-button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s ease, height 0.3s ease;
}

.back-button:hover::after {
    width: 300px;
    height: 300px;
}

.back-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

/* 粒子動畫 */
.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent-color);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.particle:nth-child(1) {
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    top: 60%;
    left: 80%;
    animation-delay: 1s;
}

.particle:nth-child(3) {
    top: 80%;
    left: 40%;
    animation-delay: 2s;
}

.particle:nth-child(4) {
    top: 30%;
    left: 70%;
    animation-delay: 3s;
}

.particle:nth-child(5) {
    top: 70%;
    left: 10%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.7;
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
        opacity: 1;
    }
}

/* 響應式設計 */
@media (max-width: 768px) {
    .content {
        margin: 20px;
        padding: 40px 30px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .icon {
        font-size: 3rem;
    }
    
    p {
        font-size: 1.1rem;
    }
}