:root {
    --bg-color: #F8F9FA;
    --text-color: #212529;
    --primary-color: #0D6EFD;
    --border-color: #DEE2E6;
    --card-bg: #FFFFFF;
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #E0E0E0;
    --primary-color: #60A5FA;
    --border-color: #333333;
    --card-bg: #1E1E1E;
}

* {
    box-sizing: border-box;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0.8rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

header nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

header h1 {
    margin: 0;
    font-size: 1.5rem;
}

header a {
    text-decoration: none;
    color: var(--text-color);
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    white-space: nowrap;
}

nav a:hover {
    color: var(--primary-color);
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.post-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    transition: transform 0.2s;
}

.post-card:hover {
    transform: translateY(-4px);
}

.post-card h2 {
    margin-top: 0;
}

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

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

.post-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.post-header h1 {
    margin: 0;
    line-height: 1.2;
}

.post-meta {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.7;
}

.btn-theme {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    white-space: nowrap;
}

hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

.btn-theme:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Markdown Content Styling */
.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
}

.post-content pre {
    background-color: #2D2D2D;
    color: #F8F8F2;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
}

.post-content code {
    font-family: 'Fira Code', monospace;
}

footer {
    text-align: center;
    padding: 2rem;
    opacity: 0.6;
    font-size: 0.9rem;
}