:root {
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-border: #e0e0e0;
    --color-accent: #0066cc;
    --color-accent-hover: #0052a3;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
        Arial, sans-serif;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --transition: all 0.3s ease;
}

html.dark-mode {
    --color-bg: #1a1a1a;
    --color-text: #ffffff;
    --color-text-secondary: #b0b0b0;
    --color-border: #333333;
    --color-accent: #4d94ff;
    --color-accent-hover: #66a3ff;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    transition: var(--transition);
}

/* Header & Navigation */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    transition: var(--transition);
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.theme-toggle,
.subscribe-btn,
.subscribe-cta {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
    font-family: var(--font-family);
}

.theme-toggle:hover,
.subscribe-btn:hover,
.subscribe-cta:hover {
    background-color: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* Hide subscribe buttons */
.subscribe-btn,
.subscribe-cta {
    display: none;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 200;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--color-bg);
    padding: var(--spacing-xl);
    border-radius: 8px;
    max-width: 400px;
    width: 90%;
    position: relative;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-text);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--color-accent);
}

.modal h2 {
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-xl);
}

.subscribe-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.subscribe-form input {
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    background-color: var(--color-bg);
    color: var(--color-text);
    border-radius: 4px;
    font-family: var(--font-family);
}

.subscribe-form button[type="submit"] {
    background-color: var(--color-accent);
    color: white;
    border: none;
    padding: var(--spacing-md);
    cursor: pointer;
    border-radius: 4px;
    font-weight: 600;
    transition: var(--transition);
}

.subscribe-form button[type="submit"]:hover {
    background-color: var(--color-accent-hover);
}

.skip-btn {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    padding: var(--spacing-md);
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
    font-family: var(--font-family);
}

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

/* Main Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

/* Hero Section */
.hero {
    margin-bottom: var(--spacing-xl);
}

.hero h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
}

.tagline {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.bio {
    margin-top: var(--spacing-lg);
}

.bio p {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.social-link {
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.social-link:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* Posts Section */
.posts {
    margin-top: var(--spacing-xl);
}

.posts h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    font-weight: 700;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.post-card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: var(--color-accent);
}

html.dark-mode .post-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.post-thumbnail {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--color-border);
}

.post-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.post-card:hover .post-thumbnail img {
    transform: scale(1.05);
}

.post-card-content {
    padding: var(--spacing-md);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.post-date {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

.post-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    flex-grow: 1;
}

.post-link {
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition);
}

.post-link:hover {
    color: var(--color-accent);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    color: var(--color-text-secondary);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xl);
}

.footer p {
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .posts-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

@media (max-width: 640px) {
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .hero h1 {
        font-size: var(--font-size-xl);
    }

    .posts-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .post-thumbnail {
        height: 150px;
    }

    .nav {
        gap: var(--spacing-sm);
    }

    .theme-toggle,
    .subscribe-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }

    .modal-content {
        padding: var(--spacing-lg);
    }

    .social-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}