:root {
    /* Colors - Light Mode */
    --primary-red: #FF0000;
    --primary-dark: #0F0F0F;
    --secondary-pink: #E4405F;
    --accent-orange: #F56040;
    --accent-purple: #833AB4;
    
    --bg-color: #ffffff;
    --text-color: #0F0F0F;
    --card-bg: rgba(255, 255, 255, 0.8);
    --border-color: rgba(0, 0, 0, 0.1);
    --nav-bg: rgba(255, 255, 255, 0.9);
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
    
    --gradient-insta: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    --gradient-yt: linear-gradient(90deg, #FF0000 0%, #CC0000 100%);
}

[data-theme="dark"] {
    --bg-color: #0F0F0F;
    --text-color: #F1F1F1;
    --card-bg: rgba(30, 30, 30, 0.6);
    --border-color: rgba(255, 255, 255, 0.1);
    --nav-bg: rgba(15, 15, 15, 0.9);
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* Glassmorphism */
.glass {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}

/* Navbar */
nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-yt);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Dropdown */
.dropdown {
    position: relative;
    cursor: pointer;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 250px;
    background: var(--nav-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    padding: 0.5rem 0;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a {
    display: block;
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
}

/* Theme Toggle */
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-color);
}

/* Hero Section */
.hero {
    position: relative;
    padding: 100px 5% 150px;
    text-align: center;
    overflow: hidden;
}

#particle-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    background: var(--gradient-yt);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto 2.5rem;
    opacity: 0.8;
}

.cta-group {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.btn {
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary-red);
    color: white;
    box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Tool Grid */
.tool-section {
    padding: 80px 5%;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.tool-card {
    padding: 2.5rem;
    transition: transform 0.3s, border-color 0.3s;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.tool-card:hover {
    transform: scale(1.03);
    border-color: var(--primary-red);
}

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

.tool-card h3 {
    margin-bottom: 1rem;
}

.tool-card p {
    font-size: 0.95rem;
    opacity: 0.7;
    margin-bottom: 1.5rem;
}

/* Footer */
footer {
    background: var(--primary-dark);
    color: #fff;
    padding: 80px 5% 40px;
    margin-top: 100px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 50px;
}

.footer-col h4 {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 0.8rem;
}

.footer-col a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-col a:hover {
    color: #fff;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.6;
}

/* Tool Specific Utilities */
.tool-container {
    max-width: 900px;
    margin: 40px auto;
    padding: 40px;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.input-group input, 
.input-group textarea, 
.input-group select {
    width: 100%;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.input-group input:focus {
    border-color: var(--primary-red);
}

.result-card {
    margin-top: 30px;
    padding: 2rem;
    display: none;
}

.score-display {
    font-size: 3rem;
    font-weight: 800;
    margin: 1rem 0;
    color: var(--primary-red);
}

.progress-bar {
    width: 100%;
    height: 10px;
    background: rgba(0,0,0,0.1);
    border-radius: 5px;
    margin: 1rem 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-yt);
    width: 0%;
    transition: width 0.5s ease;
}

/* SEO Content Section */
.seo-content {
    max-width: 900px;
    margin: 80px auto;
    padding: 0 20px;
}

.seo-content h2 { margin: 2rem 0 1rem; }
.seo-content p { margin-bottom: 1.5rem; opacity: 0.8; }
.seo-content ul { margin-bottom: 1.5rem; padding-left: 1.5rem; }

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .nav-links { display: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .tool-container { padding: 20px; }
}