:root {
    --color-bg: #f9f9f9;
    --color-text: #1a1a1a;
    --color-heading: #111111;
    --color-muted: #555555;
    --color-brand-black: #111111;
    --color-brand-orange: #f26522;
    --color-card-bg: #ffffff;
    --color-gray: #e0e0e0;
    --font-main: 'Inter', sans-serif;
    --border-radius: 8px;
    --transition-speed: 0.2s;
}

[data-theme="dark"] {
    --color-bg: #121212;
    --color-text: #e0e0e0;
    --color-heading: #ffffff;
    --color-muted: #aaaaaa;
    --color-brand-black: #0a0a0a;
    --color-brand-orange: #f26522;
    --color-card-bg: #1e1e1e;
    --color-gray: #333333;
}

.theme-toggle {
    background: none;
    border: none;
    color: #ffffff;
    font-size: 1.2rem;
    cursor: pointer;
    line-height: 1;
    padding: 0 5px;
    transition: opacity var(--transition-speed);
}

.theme-toggle:hover {
    opacity: 0.8;
}

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

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

a {
    color: var(--color-brand-orange);
    text-decoration: none;
    transition: color var(--transition-speed);
}

a:hover {
    filter: brightness(0.9);
}

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

/* Header */
.site-header {
    background-color: var(--color-brand-black);
    color: #ffffff; /* Navbar is always dark natively */
    padding: 15px 0;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 40px;
    display: block;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    align-items: center;
}

.main-nav a {
    color: #ffffff;
    font-weight: 600;
}

.main-nav a:hover {
    color: var(--color-brand-orange);
}

/* Main Content area */
main {
    flex: 1;
    padding: 40px 20px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 60px 0;
    background-color: var(--color-card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 40px;
}

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

.hero .subtitle {
    font-size: 1.2rem;
    color: var(--color-muted);
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.category-card {
    display: block;
    background: var(--color-card-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    color: var(--color-text);
    text-decoration: none;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    border-top: 4px solid var(--color-brand-orange);
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
    color: var(--color-text);
}

.category-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--color-heading);
}

.category-card p {
    color: var(--color-brand-orange);
    font-weight: 600;
}

/* Lists */
.page-header {
    margin-bottom: 40px;
}

.page-header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    color: var(--color-heading);
}

.category-description {
    font-size: 1.1rem;
    color: var(--color-muted);
}

.article-list {
    display: grid;
    gap: 20px;
}

.article-card {
    background: var(--color-card-bg);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.article-card h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.article-card h2 a {
    color: var(--color-heading);
}

.article-card h2 a:hover {
    color: var(--color-brand-orange);
}

.article-card p {
    color: var(--color-muted);
    margin-bottom: 15px;
}

.read-more {
    font-weight: 600;
}

/* Post */
.post {
    background: var(--color-card-bg);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.post-header {
    margin-bottom: 30px;
    border-bottom: 1px solid var(--color-gray);
    padding-bottom: 20px;
}

.post-header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--color-heading);
}

.post-meta {
    color: var(--color-muted);
    font-size: 0.9rem;
}

.post-content h2, .post-content h3 {
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--color-heading);
}

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

.post-content ul, .post-content ol {
    margin-bottom: 15px;
    padding-left: 20px;
}

/* Footer */
.site-footer {
    background-color: var(--color-brand-black);
    color: #ffffff;
    text-align: center;
    padding: 30px 0;
    margin-top: auto;
}

@media (max-width: 600px) {
    .header-inner {
        flex-direction: column;
        gap: 15px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
}