:root {
    --primary-color: #007AFF; /* Tech Blue */
    --bg-color: #F5F7FA;
    --card-bg: #FFFFFF;
    --text-color: #333333;
    --text-light: #888888;
    --border-color: #E1E4E8;
    --header-height: 60px;
}

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

/* Header */
header {
    background-color: var(--card-bg);
    height: var(--header-height);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none;
    letter-spacing: -0.5px;
}

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

nav a {
    text-decoration: none;
    color: var(--text-light);
    margin-left: 20px;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

/* Container */
.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

/* Card Style */
.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    margin-bottom: 20px;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-2px);
}

/* Post List */
.post-item h2 {
    margin-top: 0;
    font-size: 1.4rem;
}

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

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

.post-meta {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 15px;
}

.post-excerpt {
    color: #555;
    font-size: 1rem;
}

/* Detail Page */
.post-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.post-content h1 {
    font-size: 1.5rem; /* Smaller H1 */
    margin-top: 1.5em;
    color: #222;
}

.post-content h2 {
    font-size: 1.3rem; /* Smaller H2 */
    margin-top: 1.5em;
    color: #222;
}

.post-content h3 {
    font-size: 1.2rem; /* Smaller H3 */
    margin-top: 1.5em;
    color: #222;
}

.post-content pre {
    background: #f4f4f4;
    padding: 15px;
    border-radius: 4px;
    overflow-x: auto;
}

.post-content blockquote {
    border-left: 4px solid var(--primary-color);
    margin: 0;
    padding-left: 20px;
    color: #666;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    box-sizing: border-box;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
}

.btn:hover {
    background-color: #0056b3;
}

.btn-secondary {
    background-color: #6c757d;
}

.btn-danger {
    background-color: #dc3545;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
}

/* Markdown Editor adjustments */
.CodeMirror {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    min-height: 400px;
}