:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #6b7280;
    --secondary-hover: #4b5563;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --success-color: #10b981;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.header h1 {
    color: var(--primary-color);
    font-size: 1.875rem;
    font-weight: 700;
}

.auth-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.main-content {
    min-height: 70vh;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: 1px solid transparent;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    background: transparent;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

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

.btn-danger {
    background-color: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

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

.hidden {
    display: none !important;
}

.error-message {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
}

.error-message h2 {
    color: var(--danger-color);
    margin-bottom: 1rem;
}

.admin-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

#post-form {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: var(--shadow);
}

#post-form h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.input-container {
    margin-bottom: 1.5rem;
}

.input-container label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.input-form {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 1rem;
    transition: border-color 0.2s ease-in-out;
}

.input-form:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.input-form[type="date"] {
    max-width: 200px;
}

textarea.input-form {
    min-height: 100px;
    resize: vertical;
    font-family: inherit;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

#posts-list {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 2rem;
    box-shadow: var(--shadow);
}

#posts-list h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.post-list-item {
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0;
}

.post-list-item:last-child {
    border-bottom: none;
}

.post-list-item h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.post-list-item p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

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

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .admin-actions {
        flex-direction: column;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .post-actions {
        flex-direction: column;
    }
}