:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    padding-top: 80px;
}

/* Header */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.8rem;
    color: var(--primary-color) !important;
}

.navbar-nav .nav-link {
    font-weight: 500;
    color: var(--text-dark) !important;
    margin: 0 0.5rem;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--primary-color) !important;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 4rem 0;
    margin-bottom: 3rem;
}

/* Search Bar */
.search-container {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 3rem;
}

.search-input {
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 12px 20px;
    font-size: 1.1rem;
}

.search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.25);
}

/* Category Filters */
.category-filters {
    margin-bottom: 2rem;
}

.category-btn {
    background: white;
    border: 2px solid var(--border-color);
    color: var(--text-dark);
    padding: 8px 20px;
    border-radius: 25px;
    margin: 0 5px 10px 0;
    transition: all 0.3s ease;
}

.category-btn:hover,
.category-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Tool Cards */
.tool-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    height: 100%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: relative;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    text-decoration: none;
    color: inherit;
}

.tool-card .icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    color: white;
}

.tool-card h5 {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.tool-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin: 0;
}

.tool-card .badge {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 0.7rem;
}

/* Advertisement Spaces */
.ad-banner {
    background: var(--bg-light);
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    padding: 2rem;
    text-align: center;
    margin: 3rem 0;
    color: var(--text-light);
}

.ad-sidebar {
    background: var(--bg-light);
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    padding: 1.5rem;
    text-align: center;
    color: var(--text-light);
    margin-bottom: 2rem;
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Category Icons */
.security { background: linear-gradient(135deg, #dc2626, #b91c1c); }
.network { background: linear-gradient(135deg, #059669, #047857); }
.converter { background: linear-gradient(135deg, #7c3aed, #6d28d9); }
.generator { background: linear-gradient(135deg, #ea580c, #dc2626); }
.developer { background: linear-gradient(135deg, #0891b2, #0e7490); }
.text { background: linear-gradient(135deg, #ca8a04, #a16207); }

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer h5 {
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .tool-card {
        margin-bottom: 1rem;
    }

    .page-header {
        padding: 2rem 0;
    }
}