:root {
    --color-bg: #ffffff;
    --color-surface: #f5f5f5;
    --color-text: #1a1a1a;
    --color-text-muted: #666666;
    --color-primary: #0066cc;
    --color-primary-hover: #0052a3;
    --color-success: #16a34a;
    --color-success-hover: #15803d;
    --color-error: #dc2626;
    --color-error-hover: #b91c1c;
    --color-border: #e0e0e0;
    --color-secondary: #6b7280;
    --color-secondary-hover: #4b5563;
    
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: clamp(0.875rem, 2vw, 1rem);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-xl);
}

header h1 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 600;
    color: var(--color-text);
}

.logout-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-surface);
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    transition: background-color 0.2s;
}

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

main {
    flex: 1;
}

.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-xl);
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.login-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.login-subtitle {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-lg);
}

.error-message {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: #fef2f2;
    color: var(--color-error);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
    font-size: 0.875rem;
    border: 1px solid #fecaca;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text);
}

input[type="text"],
input[type="password"],
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    background-color: var(--color-bg);
}

input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

textarea {
    resize: vertical;
    min-height: 120px;
    font-family: var(--font-body);
    line-height: 1.5;
}

input[type="file"] {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.875rem;
    cursor: pointer;
    background-color: var(--color-surface);
}

input[type="file"]:hover {
    border-color: var(--color-primary);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    min-height: 44px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    text-decoration: none;
    text-align: center;
    line-height: 1;
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

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

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

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

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

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

.btn-block {
    width: 100%;
}

.compose-container h2,
.preview-container h2,
.success-container h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.char-count {
    text-align: right;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
    font-family: var(--font-mono);
}

.media-preview {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
}

.media-preview img,
.media-preview video {
    width: 100%;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.media-preview button {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-error);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    cursor: pointer;
}

.media-preview button:hover {
    background-color: var(--color-error-hover);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.post-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.post-buttons .btn {
    width: 100%;
}

.btn-both {
    background-color: var(--color-success);
}

.btn-both:hover {
    background-color: var(--color-success-hover);
}

.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator {
    display: inline;
}

.htmx-request .btn-text {
    display: none;
}

.preview-content {
    margin-bottom: var(--spacing-lg);
}

.preview-section {
    margin-bottom: var(--spacing-lg);
}

.preview-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.preview-box {
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.preview-text {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--color-text);
}

.preview-media {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.preview-media img,
.preview-media video {
    width: 100%;
    display: block;
}

.preview-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.preview-actions .btn {
    width: 100%;
}

.edit-form {
    margin-bottom: var(--spacing-lg);
}

.success-container {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.success-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.success-results {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.success-item {
    padding: var(--spacing-sm) 0;
    color: var(--color-success);
    font-weight: 500;
    font-size: 1rem;
}

.success-actions {
    margin-top: var(--spacing-xl);
}

@media (min-width: 480px) {
    .container {
        padding: var(--spacing-lg);
    }
    
    .post-buttons {
        flex-direction: row;
    }
    
    .post-buttons .btn {
        flex: 1;
    }
    
    .preview-actions {
        flex-direction: row;
    }
    
    .preview-actions .btn {
        flex: 1;
    }
    
    .action-buttons {
        justify-content: flex-start;
    }
}

@media (min-width: 640px) {
    .container {
        padding: var(--spacing-xl);
    }
}