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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: white;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: white;
    color: black;
    padding: 30px 20px;
    text-align: center;
    border-bottom: 2px solid #000;
}

header h1 {
    font-size: 28px;
    margin-bottom: 10px;
}

header p {
    font-size: 14px;
    opacity: 0.9;
}

.content {
    padding: 30px 20px;
}

.guidelines-list {
    list-style: none;
}

.guidelines-list li {
    padding: 0;
    margin-bottom: 10px;
    background: white;
    border-left: 4px solid #000;
    border-radius: 5px;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid #ddd;
}

.guidelines-list f9f9f9er {
    background: #efefef;
}

.guideline-header {
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.guideline-title {
    font-weight: bold;
    color: #000;
    font-size: 16px;
    flex: 1;
}

.expand-icon {
    font-size: 20px;
    color: #000;
    transition: transform 0.3s ease;
    min-width: 20px;
    text-align: center;
}

.guideline-item.expanded .expand-icon {
    transform: rotate(45deg);
}

.guideline-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.guideline-item.expanded .guideline-details {
    max-height: 200px;
    padding: 0 15px 15px 15px;
}

.guideline-cn {
    color: #000;
    font-size: 14px;
    margin-bottom: 8px;
}

.guideline-eng-wrapper {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.guideline-eng {
    color: #333;
    font-size: 13px;
    font-style: italic;
    flex: 1;
}

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.3s ease;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
}

.copy-icon,
.checkmark-icon {
    width: 20px;
    height: 20px;
    stroke: #000;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.checkmark-icon {
    stroke: #4caf50;
    fill: #4caf50;
}

.copy-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    transform: scale(1.2);
}

.copy-btn.copied .copy-icon {
    display: none;
}

footer {
    background: #f5f5f5;
    padding: 20px;
    text-align: center;
    color: #666;
    font-size: 12px;
    border-top: 1px solid #e0e0e0;
}

/* Responsive design for mobile */
@media (max-width: 600px) {
    header h1 {
        font-size: 22px;
    }

    .content {
        padding: 20px 15px;
    }

    .guidelines-list li {
        padding: 12px;
        margin-bottom: 8px;
        font-size: 14px;
    }
}

@media (max-width: 400px) {
    body {
        padding: 10px;
    }

    header {
        padding: 20px 15px;
    }

    header h1 {
        font-size: 20px;
        margin-bottom: 5px;
    }

    header p {
        font-size: 12px;
    }

    .content {
        padding: 15px 12px;
    }

    .guidelines-list li {
        padding: 10px;
        margin-bottom: 6px;
        font-size: 13px;
    }
}