:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
}

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

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

/* Main Content */
.main-content {
    flex: 1;
    padding: 40px 0;
}

/* Hero Section */
.hero {
    text-align: center;
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--text-main);
    margin-bottom: 10px;
}

.hero p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Checker Card */
.checker-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    max-width: 700px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.input-group input {
    flex: 1;
    padding: 15px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

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

.btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
}

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

.btn:active {
    transform: scale(0.98);
}

/* Result Card */
.result-card {
    margin-top: 30px;
    padding: 20px;
    border-radius: 8px;
    background: var(--bg-color);
    border: 1px solid var(--border);
    display: none;
    animation: fadeIn 0.5s ease;
}

.result-card.active {
    display: block;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.score-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
}

.score-details h3 {
    margin-bottom: 5px;
}

.status-badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: white;
}

.status-high { background: var(--success); }
.status-medium { background: var(--warning); }
.status-low { background: var(--danger); }

.metrics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.metric-item {
    background: white;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
}

/* Standard Pages */
.page-header {
    text-align: center;
    margin-bottom: 30px;
}

.content-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.content-card h2, .content-card h3 {
    margin: 20px 0 10px;
}

.content-card p {
    margin-bottom: 15px;
}

.content-card ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

/* Blog Layout */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.blog-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    transition: transform 0.3s;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-5px);
}

.blog-image {
    width: 100%;
    height: 200px;
    background: var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.blog-content {
    padding: 20px;
    flex: 1;
}

.blog-content h3 {
    margin-bottom: 10px;
    color: var(--primary);
}

.blog-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Footer */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border);
    padding: 30px 0;
    margin-top: auto;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 15px;
    font-size: 0.9rem;
}

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

/* Loader */
.loader {
    display: none;
    text-align: center;
    margin-top: 20px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
}