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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
    padding: 20px 0;
    margin-bottom: 30px;
}

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

header h1 {
    font-size: 24px;
    color: #0066cc;
}

nav a {
    margin-left: 20px;
    text-decoration: none;
    color: #666;
    transition: color 0.3s;
}

nav a:hover {
    color: #0066cc;
}

/* Buttons */
button, .btn {
    background: #0066cc;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    display: inline-block;
    transition: background 0.3s;
}

button:hover, .btn:hover {
    background: #0052a3;
}

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

.btn-danger {
    background: #dc3545;
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

input, textarea, select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

textarea {
    min-height: 150px;
    resize: vertical;
}

/* Cards */
.card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card h2 {
    margin-bottom: 10px;
    color: #333;
}

.card-meta {
    color: #999;
    font-size: 14px;
    margin-bottom: 15px;
}

.card-content {
    color: #666;
    line-height: 1.8;
}

/* Tags */
.tags {
    margin-top: 15px;
}

.tag {
    display: inline-block;
    background: #e9ecef;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    color: #495057;
    margin-right: 8px;
    margin-bottom: 8px;
}

/* Auth forms */
.auth-container {
    max-width: 400px;
    margin: 50px auto;
}

.auth-card {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 30px;
}

/* Messages */
.message {
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
    color: #999;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    header .container {
        flex-direction: column;
        gap: 15px;
    }

    nav {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }
}