:root {
    --primary-color: #4a6fa5;
    --secondary-color: #166088;
    --accent-color: #4fc3f7;
    --background-color: #f5f7fa;
    --card-color: #ffffff;
    --text-color: #333333;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.tool-category {
    margin-bottom: 30px;
}

.tool-category h2 {
    color: var(--secondary-color);
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.tool-card {
    background-color: var(--card-color);
    border-radius: 10px;
    padding: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.tool-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.tool-card h3 {
    color: var(--secondary-color);
    margin-bottom: 10px;
}

#tool-view {
    background-color: var(--card-color);
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

#back-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

#back-button:hover {
    background-color: var(--secondary-color);
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: #666;
    font-size: 0.9rem;
}

/* 工具样式 */
.tool-input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 15px;
    font-family: inherit;
}

.tool-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    margin-right: 10px;
    margin-bottom: 10px;
    transition: var(--transition);
}

.tool-button:hover {
    background-color: var(--secondary-color);
}

.tool-result {
    margin-top: 20px;
    padding: 15px;
    background-color: #f0f8ff;
    border-radius: 5px;
    border-left: 4px solid var(--accent-color);
}

.tool-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.password-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
    margin-bottom: 15px;
}

.option-checkbox {
    display: flex;
    align-items: center;
    gap: 5px;
}

.qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.footer a {
    color: #666;
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 2rem;
    }
}