* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: #F5F5F5;
    color: #333333;
    line-height: 1.5;
    min-height: 100vh;
}

.header {
    background: linear-gradient(135deg, #3498db, #2c3e50);
    color: white;
    padding: clamp(0.75rem, 2vw, 0.9375rem);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.back-btn {
    color: white;
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    background: none;
    border: 0.125rem solid #ffffff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: clamp(2rem, 5vw, 2.5rem);
    height: clamp(2rem, 5vw, 2.5rem);
    border-radius: 0.625rem;
    transition: background-color 0.2s;
}

.back-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.header-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 500;
    text-align: center;
    flex: 1;
}

.container {
    padding: clamp(1rem, 3vw, 1.25rem);
    max-width: 37.5rem;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 3.75rem);
}

.notice-card {
    background: white;
    border-radius: 0.75rem;
    padding: clamp(1.5rem, 4vw, 2rem);
    box-shadow: 0 0.125rem 0.5rem rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 100%;
    max-width: 22rem;
}

.notice-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #f39c12;
}

.notice-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.notice-content {
    font-size: 1rem;
    color: #666;
    line-height: 1.6;
}

.highlight-text {
    color: #e74c3c;
    font-weight: 600;
}

@media (max-width: 30rem) {
    .container {
        padding: 0.75rem;
    }
    
    .notice-card {
        padding: 1.25rem;
    }
    
    .notice-icon {
        font-size: 2.5rem;
    }
    
    .notice-title {
        font-size: 1.125rem;
    }
}