/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Loading State */
.btn.is-loading {
    position: relative;
    color: transparent;
}

.btn.is-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Primary Button */
.btn-primary {
    background: var(--accent-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

/* Secondary Button */
.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--header-text);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.2);
}

/* Preset Theme Button */
.btn-preset {
    background: var(--app-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-preset:hover:not(:disabled) {
    background: var(--border-color);
}

.btn-preset.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Scale Button */
.btn-scale {
    background: var(--app-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    min-width: 40px;
}

.btn-scale:first-child {
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.btn-scale:last-child {
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.btn-scale:not(:first-child) {
    margin-left: -1px;
}

.btn-scale:hover:not(:disabled) {
    background: var(--border-color);
    z-index: 1;
}

.btn-scale.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    z-index: 2;
}

/* Select Styles */
select {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--panel-bg);
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
}

select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Input Styles */
input[type="number"] {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--panel-bg);
    color: var(--text-primary);
    outline: none;
}

input[type="number"]:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--text-primary);
    color: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
}

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

.toast.error {
    background: var(--error-color);
}

.toast.warning {
    background: var(--warning-color);
}

.toast-close {
    background: none;
    border: none;
    color: inherit;
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0.7;
    padding: 0;
    margin-left: var(--spacing-sm);
}

.toast-close:hover {
    opacity: 1;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-overlay.hidden {
    display: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
    text-align: center;
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state-text {
    font-size: 1rem;
}

/* Diagram-specific color sections */
#diagram-specific-colors.hidden {
    display: none;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--app-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Focus Visible */
:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Margin Slider */
.margin-slider {
    width: 80px;
    height: 6px;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
}

.margin-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s ease;
}

.margin-slider::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
}

.margin-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent-color);
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: background 0.2s ease;
}

.margin-slider::-moz-range-thumb:hover {
    background: var(--accent-hover);
}

#margin-value {
    min-width: 40px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* PDF Warning */
.pdf-warning {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.4);
    border-radius: var(--radius-sm);
    color: #d97706;
    font-size: 0.8rem;
    margin-bottom: var(--spacing-sm);
}

.pdf-warning .warning-icon {
    font-size: 1rem;
    color: #f59e0b;
}

.pdf-warning.hidden {
    display: none;
}

/* Export Preview */
.export-preview {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    color: var(--accent-color);
    font-size: 0.8rem;
    text-align: center;
    min-height: 1.5em;
}

.export-preview:empty {
    display: none;
}