:root {
    --color-navy: #0A192F;
    --color-slate: #708090;
    --color-white: #FFFFFF;
    --color-bg: #F8F9FA;
    --color-text-main: #333333;
    --color-border: #E0E0E0;
    --color-ad-bg: #EAEAEA;
    --color-ad-border: #CCCCCC;
    
    --font-primary: 'Inter', 'Roboto', sans-serif;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* Typography & Vertical Rhythm */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-navy);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-navy);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-slate);
}

/* Header & Navigation */
header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-navy);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-links a {
    font-weight: 500;
}

.search-bar {
    display: flex;
    align-items: center;
}

.search-bar input {
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-family: var(--font-primary);
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--color-navy);
}

/* Layout */
main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    width: 100%;
}

.content-wrapper {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.main-content {
    flex: 1;
    min-width: 300px;
}

.sidebar {
    width: 300px;
    flex-shrink: 0;
}

/* Ad Placeholders */
.ad-placeholder {
    background-color: var(--color-ad-bg);
    border: 1px dashed var(--color-ad-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-slate);
    font-size: 0.875rem;
    margin: var(--spacing-md) auto;
    text-align: center;
}

.ad-placeholder::before {
    content: "Advertisement";
}

.ad-leaderboard {
    width: 728px;
    height: 90px;
    max-width: 100%;
}

.ad-banner {
    width: 100%;
    height: 90px;
}

.ad-sidebar {
    width: 300px;
    height: 600px;
    position: sticky;
    top: 100px;
}

/* UI Elements */
.breadcrumbs {
    font-size: 0.875rem;
    color: var(--color-slate);
    margin-bottom: var(--spacing-md);
}

.breadcrumbs a {
    color: var(--color-navy);
}

.chips {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.chip {
    background-color: var(--color-navy);
    color: var(--color-white);
    padding: 0.25rem 0.75rem;
    border-radius: 16px;
    font-size: 0.875rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 600px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.form-group input, .form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-family: var(--font-primary);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--color-navy);
}

.btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--color-navy);
    color: var(--color-white);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    font-family: var(--font-primary);
    transition: background-color 0.2s ease;
}

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

.error-msg {
    color: #d93025;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: none;
}

/* Cards (for recent articles) */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.article-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-sm);
    transition: box-shadow 0.2s ease;
}

.article-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.article-card h3 {
    margin-top: var(--spacing-xs);
    font-size: 1.25rem;
}

/* Footer */
footer {
    background-color: var(--color-navy);
    color: var(--color-white);
    padding: var(--spacing-lg) var(--spacing-md);
    margin-top: auto;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-section h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

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

.footer-links li {
    margin-bottom: 0.5rem;
}

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

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

.copyright {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255,255,255,0.1);
    color: var(--color-slate);
    font-size: 0.875rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links, .search-bar {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
    }
    
    .sidebar {
        width: 100%;
    }
    
    .ad-sidebar {
        position: static;
        width: 100%;
        height: 250px;
    }
}