body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
    color: #333;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}
.header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}
.header h1 {
    font-size: 2.5em;
    font-weight: 300;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}
.header p {
    color: #666;
    font-size: 1em;
}
.back-button {
    display: inline-block;
    margin-bottom: 20px;
    padding: 10px 20px;
    background: #f0f0f0;
    color: #667eea;
    text-decoration: none;
    border-radius: 25px;
    transition: all 0.3s ease;
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}
.back-button:hover {
    background: #e0e0e0;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}
.tool-card {
    background: #ffffff;
    border-radius: 12px;
    border: 1px solid #e8ecf1;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    transition: all 0.25s ease;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.tool-card:hover {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
    border-color: #cdd3db;
}
.tool-card-body {
    padding: 20px 22px 14px;
    flex: 1;
}
.tool-card-body .tool-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}
.tool-card-body h3 {
    font-size: 1.15em;
    color: #333;
    margin: 0 0 6px 0;
    font-weight: 600;
}
.tool-card-body p {
    color: #666;
    font-size: 0.9em;
    margin: 0;
    line-height: 1.5;
}
.tool-card-footer {
    padding: 12px 22px;
    border-top: 1px solid #f0f0f0;
    display: flex;
    justify-content: flex-end;
}
.tool-card-footer .open-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}
.tool-card-footer .open-btn:hover {
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.45);
    transform: translateY(-1px);
}
@media (max-width: 768px) {
    .header h1 {
        font-size: 2em;
    }
    .tools-grid {
        grid-template-columns: 1fr;
    }
}