body {
    margin: 0;
    padding: 0;
    font-family: system-ui, Arial, sans-serif;
    background: #f4f4f6;
    color: #222;
}

/* Header */
.site-header {
    background: white;
    border-bottom: 1px solid #ddd;
    padding: 15px 0;
}

.container {
    max-width: 1100px;
    margin: auto;
    padding: 0 20px;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 22px;
    font-weight: 700;
    color: #1d4ed8;
    text-decoration: none;
}

/* Menu */
.menu {
    list-style: none;
    display: flex;
    gap: 20px;
}

.menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

.menu a.active,
.menu a:hover {
    color: #1d4ed8;
    font-weight: 600;
}

.menu-toggle {
    display: none;
}

/* Breadcrumb */
#breadcrumb {
    max-width: 1100px;
    margin: 15px auto;
    padding-left: 20px;
    color: #555;
    font-size: 14px;
}

/* Content */
.content-area {
    margin-top: 40px;
}

.tool-box {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
}

.cat {
    display: block;
    padding: 20px;
    background: #fff;
    text-align: center;
    border-radius: 10px;
    font-weight: 500;
    color: #1d4ed8;
    text-decoration: none;
    border: 1px solid #e5e7eb;
}

.cat:hover {
    background: #eef4ff;
}

/* Footer */
.site-footer {
    background: #1d4ed8;
    padding: 18px;
    text-align: center;
    color: white;
    margin-top: 40px;
}

.site-footer a {
    color: white;
    text-decoration: none;
    font-weight: 500;
}

/* Mobile */
@media (max-width: 768px) {
    .menu {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 60px;
        right: 20px;
        padding: 15px;
        border: 1px solid #ddd;
    }

    .menu-toggle {
        display: block;
        background: none;
        border: none;
        font-size: 26px;
    }
}