/* 
   MultiTool Hub - Main CSS 
   Modern, Responsive, and Light/Dark Mode Ready
*/

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;

    --bg-light: #f1f5f9;
    --text-light: #0f172a;
    --card-light: rgba(255, 255, 255, 0.9);
    --border-light: rgba(226, 232, 240, 0.8);

    --bg-dark: #020617;
    --text-dark: #f8fafc;
    --card-dark: rgba(30, 41, 59, 0.8);
    --border-dark: rgba(51, 65, 85, 0.8);

    /* Default Theme Variables */
    --bg-main: var(--bg-light);
    --text-main: var(--text-light);
    --card-main: var(--card-light);
    --border-main: var(--border-light);

    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

[data-theme="dark"] {
    --bg-main: var(--bg-dark);
    --text-main: var(--text-dark);
    --card-main: var(--card-dark);
    --border-main: var(--border-dark);
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    padding: 0;
    transition: var(--transition);
    line-height: 1.6;
}

* {
    box-sizing: border-box;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Header Styles */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--card-main);
    border-bottom: 1px solid var(--border-main);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: 8rem 2rem;
    text-align: center;
    background: radial-gradient(circle at top right, #6366f1, #8b5cf6, #3b82f6);
    color: white;
    border-radius: 0 0 4rem 4rem;
    box-shadow: var(--shadow-lg);
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 1.25rem 1.5rem;
    border-radius: 9999px;
    border: none;
    font-size: 1.1rem;
    box-shadow: var(--shadow-lg);
    outline: none;
}

/* Category Filter */
.categories {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.category-btn {
    padding: 0.6rem 1.2rem;
    border-radius: 9999px;
    border: 1px solid var(--border-main);
    background: var(--card-main);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

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

/* Global Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.6rem;
    border-radius: 9999px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    gap: 0.5rem;
    font-size: 1rem;
    background: var(--card-main);
    color: var(--text-main);
    border: 1px solid var(--border-main);
    text-decoration: none;
    outline: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.btn-primary {
    background: var(--primary-color);
    color: white !important;
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 8px 16px -4px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: #64748b;
    color: white !important;
    border-color: #64748b;
}

.btn-danger {
    background: #ef4444;
    color: white !important;
    border-color: #ef4444;
}

.btn-danger:hover {
    background: #dc2626;
    box-shadow: 0 8px 16px -4px rgba(239, 68, 68, 0.5);
}

.btn-success {
    background: #10b981;
    color: white !important;
    border-color: #10b981;
}

.btn-warning {
    background: #f59e0b;
    color: white !important;
    border-color: #f59e0b;
}

.btn-block {
    display: flex;
    width: 100%;
}

/* Tool Grid */
.tool-grid {
    max-width: 1200px;
    margin: 0 auto 5rem;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.tool-card {
    background: var(--card-main);
    padding: 2.5rem 2rem;
    border-radius: 2rem;
    border: 1px solid var(--border-main);
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(4px);
}

.tool-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
    background: var(--card-light);
}

.tool-card i {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.tool-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.tool-card p {
    font-size: 0.9rem;
    color: #64748b;
}

/* Footer Section */
footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 5rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 4rem;
}

.footer-section h4 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    max-width: 1200px;
    margin: 4rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid #1e293b;
    text-align: center;
    font-size: 0.9rem;
}

.social-links a {
    color: #94a3b8;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--primary-color);
    transform: scale(1.2);
}

/* Ad Placements */
.ad-slot {
    background: var(--bg-main);
    border: 2px dashed var(--border-main);
    margin: 2.5rem auto;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    color: var(--text-main);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 1.5rem;
    opacity: 0.6;
    position: relative;
    overflow: hidden;
}

.ad-slot::before {
    content: 'ADVERTISEMENT';
    font-size: 0.7rem;
    position: absolute;
    top: 5px;
    left: 10px;
    letter-spacing: 1px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .footer-content {
        grid-template-columns: 1fr;
    }
}