:root {
    --bg-primary: #f8fafc;
    --bg-surface: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --border: #e2e8f0;
    --font-sans: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

[data-theme="dark"] {
    --bg-primary: #090d16;
    --bg-surface: #111827;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --border: #1f2937;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.25s ease, border-color 0.25s ease;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
}

header {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    padding: 1.25rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
}

.logo span {
    color: var(--accent);
}

#theme-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

#theme-toggle:hover {
    background-color: var(--bg-primary);
    border-color: var(--accent);
}

.hero {
    padding: 4rem 0 3rem 0;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.04em;
    margin-bottom: 1rem;
    max-width: 700px;
}

.hero p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
}

.posts-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 5rem;
}

.post-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 2rem;
    border-radius: 12px;
}

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

.post-meta {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.post-card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.post-card h2 a {
    color: var(--text-primary);
    text-decoration: none;
}

.post-card h2 a:hover {
    color: var(--accent);
}

.post-card p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

.post-tags {
    display: flex;
    gap: 0.5rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    color: var(--text-secondary);
}

footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
}