### style.css
```css
/*
Theme Name: Urdu News Theme
Description: A clean, RTL Urdu news theme for serious journalism.
Version: 1.0
Author: AI-Generated
Text Domain: urdu-news
License: GPL v2 or later
*/

/* Import Urdu-compatible font */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Arabic:wght@400;700&display=swap');

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans Arabic', sans-serif;
    direction: rtl; /* RTL for Urdu */
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

/* Mobile-first responsive design */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

header {
    background-color: #fff;
    border-bottom: 1px solid #ddd;
    padding: 10px 0;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav li {
    margin: 0 10px;
}

nav a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
}

main {
    padding: 20px 0;
}

.section {
    margin-bottom: 30px;
}

.lead-story {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.lead-story img {
    width: 100%;
    height: auto;
    margin-bottom: 15px;
}

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

@media (min-width: 768px) {
    .latest-news {
        grid-template-columns: repeat(2, 1fr);
    }
}

.category-block {
    background-color: #fff;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.category-block h2 {
    font-size: 1.2em;
    margin-bottom: 10px;
}

.post-item {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.post-item:last-child {
    border-bottom: none;
}

.post-item img {
    width: 100%;
    height: auto;
    margin-bottom: 10px;
}

.post-meta {
    font-size: 0.9em;
    color: #666;
    margin-bottom: 10px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
}

/* Single post and archive styles */
.single-post, .archive {
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.single-post img {
    width: 100%;
    height: auto;
    margin-bottom: 15px;
}

/* SEO-friendly semantic styles */
article {
    margin-bottom: 20px;
}

h1, h2, h3 {
    font-weight: 700;
}
```