:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #10b981;
    --dark-bg: #0f172a;
    --dark-card: #1e293b;
    --light-bg: #f8fafc;
    --text-main: #334155;
    --text-light: #94a3b8;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
}

[data-theme="dark"] {
    --light-bg: #0f172a;
    --text-main: #f1f5f9;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-light: #cbd5e1;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--light-bg);
    color: var(--text-main);
    transition: background-color 0.3s, color 0.3s;
}

/* Glassmorphism */
.glass-effect {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

/* Cards */
.tool-card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    height: 100%;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

[data-theme="dark"] .tool-card {
    background: var(--dark-card);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 10px 24px;
    font-weight: 600;
    border-radius: 8px;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}

/* Header & Footer */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
}

footer {
    background-color: #fff;
    border-top: 1px solid #e2e8f0;
}

[data-theme="dark"] footer {
    background-color: var(--dark-card);
    border-color: #334155;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.025em;
}

.text-gradient {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Search Bar */
.search-wrapper {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: 16px 24px;
    border-radius: 50px;
    border: 2px solid transparent;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    font-size: 1.1rem;
    transition: all 0.3s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .search-input {
    background-color: var(--dark-card);
    color: #fff;
}

#tools-grid .col {
    display: block; /* Ensure visibility for filtering */
}

/* Ad Placeholders */
.ad-container {
    background-color: #f1f5f9;
    border: 1px dashed #cbd5e1;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #64748b;
    margin: 20px auto;
    width: 100%;
    max-width: 728px;
    height: 90px;
}

[data-theme="dark"] .ad-container {
    background-color: #1e293b;
    border-color: #475569;
}

.ad-sidebar {
    height: 600px;
    width: 300px;
}

/* Sidebar support */
@media (min-width: 992px) {
    .tool-page-layout {
        display: grid;
        grid-template-columns: 1fr 320px;
        gap: 30px;
    }
}