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

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

/* 背景装饰 */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: backgroundMove 20s linear infinite;
    pointer-events: none;
}

@keyframes backgroundMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

#app {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    padding: 3rem 2.5rem;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
}

header {
    text-align: center;
    margin-bottom: 2.5rem;
}

h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 0.8rem;
    line-height: 1.2;
}

.subtitle {
    font-size: 1rem;
    color: #718096;
    font-weight: 400;
}

.button-container {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    margin-bottom: 2rem;
}

.nav-button {
    display: flex;
    align-items: center;
    padding: 1.5rem;
    border: none;
    border-radius: 12px;
    background: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.nav-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    transition: width 0.3s ease;
}

.nav-button:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.nav-button:hover::before {
    width: 100%;
    opacity: 0.1;
}

.nav-button:active {
    transform: translateX(3px) scale(0.98);
}

.nav-button > .fab {
    font-size: 2rem;
    margin-right: 1.2rem;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.nav-button:hover > .fab {
    transform: scale(1.1);
}

.button-content {
    flex: 1;
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.button-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: #2d3748;
}

.button-desc {
    font-size: 0.85rem;
    color: #718096;
}

.nav-button .arrow {
    font-size: 1.2rem;
    color: #cbd5e0;
    margin-left: 1rem;
    transition: all 0.3s ease;
}

.nav-button:hover .arrow {
    color: inherit;
    transform: translateX(5px);
}

/* Facebook 按钮配色 */
.facebook {
    color: #1877f2;
}

.facebook::before {
    background: #1877f2;
}

.facebook:hover {
    background: linear-gradient(135deg, #e8f2ff 0%, #f0f7ff 100%);
}

/* LINE 按钮配色 */
.line {
    color: #06c755;
}

.line::before {
    background: #06c755;
}

.line:hover {
    background: linear-gradient(135deg, #e6f9f0 0%, #f0fcf5 100%);
}

.credits {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid #e2e8f0;
}

.credits p {
    font-size: 0.85rem;
    color: #a0aec0;
    line-height: 1.6;
}

/* 移动端适配 */
@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    
    .container {
        padding: 2rem 1.5rem;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .nav-button {
        padding: 1.2rem;
    }
    
    .nav-button > .fab {
        font-size: 1.6rem;
        margin-right: 1rem;
    }
    
    .button-title {
        font-size: 1rem;
    }
    
    .button-desc {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1.8rem 1.2rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 0.85rem;
    }
    
    .button-container {
        gap: 1rem;
    }
    
    .nav-button {
        padding: 1rem;
    }
    
    .nav-button > .fab {
        font-size: 1.4rem;
        margin-right: 0.8rem;
    }
    
    .button-title {
        font-size: 0.95rem;
    }
    
    .button-desc {
        font-size: 0.75rem;
    }
    
    .nav-button .arrow {
        font-size: 1rem;
        margin-left: 0.5rem;
    }
    
    .credits p {
        font-size: 0.8rem;
    }
}