/* CSS Variables for Theming */
:root {
    /* Dark Theme (Default) */
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-hover: #3a3a3a;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #666666;
    --accent-primary: #4a9eff;
    --accent-hover: #3a8eef;
    --border-color: #333333;
    --success-color: #4ade80;
    --warning-color: #fbbf24;
    --danger-color: #ef4444;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-hover: #dee2e6;
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05);
}

/* Font Themes */
[data-font="system"] {
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

[data-font="mono"] {
    --font-primary: var(--font-mono);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Main Container */
.browser-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
}

/* Header Bar */
.header-bar {
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-lg);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.tab-controls {
    display: flex;
    align-items: center;
    flex: 1;
    gap: var(--spacing-sm);
    min-width: 0;
}

.tabs-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex: 1;
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--text-muted) transparent;
}

.tabs-container::-webkit-scrollbar {
    height: 4px;
}

.tabs-container::-webkit-scrollbar-track {
    background: transparent;
}

.tabs-container::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 2px;
}

/* Tab Styles */
.tab {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    min-width: 140px;
    max-width: 200px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
    position: relative;
    flex-shrink: 0;
}

.tab:hover {
    background-color: var(--bg-hover);
    transform: translateY(-1px);
}

.tab.active {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.tab-title {
    flex: 1;
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tab-close {
    background: none;
    border: none;
    color: currentColor;
    cursor: pointer;
    padding: 2px;
    border-radius: var(--radius-sm);
    font-size: 18px;
    line-height: 1;
    opacity: 0.7;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.tab-close:hover {
    background-color: rgba(255, 255, 255, 0.2);
    opacity: 1;
}

.tab.active .tab-close:hover {
    background-color: rgba(0, 0, 0, 0.2);
}

/* New Tab Button */
.new-tab-btn {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    width: 32px;
    height: 32px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.new-tab-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-1px);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

/* DoH Indicator */
.doh-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 12px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.doh-indicator.active {
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.doh-indicator.inactive {
    background-color: var(--text-muted);
    border-color: var(--text-muted);
    color: white;
}

.doh-toggle {
    background: none;
    border: none;
    color: currentColor;
    cursor: pointer;
    font-size: 12px;
    padding: 0;
    transition: transform var(--transition-fast);
}

.doh-toggle:hover {
    transform: scale(1.2);
}

/* Settings Button */
.settings-btn {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    width: 32px;
    height: 32px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.settings-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-1px);
}

/* Address Bar */
.address-bar {
    background-color: var(--bg-secondary);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.address-input-container {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: all var(--transition-fast);
}

.address-input-container:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.1);
}

.address-icon {
    color: var(--text-muted);
    flex-shrink: 0;
}

#addressInput {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-primary);
    outline: none;
}

#addressInput::placeholder {
    color: var(--text-muted);
}

.go-btn {
    background-color: var(--accent-primary);
    border: none;
    color: white;
    border-radius: var(--radius-md);
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.go-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Tab Content */
.tab-content {
    flex: 1;
    position: relative;
    background-color: var(--bg-primary);
    overflow: hidden;
}

.tab-iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: none;
    background-color: white;
}

.tab-iframe.active {
    display: block;
}

/* Status Bar */
.status-bar {
    background-color: var(--bg-secondary);
    padding: var(--spacing-sm) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.status-indicators {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.proxy-status {
    color: var(--success-color);
    font-weight: 500;
}

.memory-status {
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-primary);
}

.modal-header h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.modal-content {
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: 60vh;
}

/* Settings Modal */
.setting-group {
    margin-bottom: var(--spacing-xl);
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-group h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-color);
}

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

.setting-item label {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.setting-item select {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.setting-item select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.2);
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    cursor: pointer;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--text-muted);
    border-radius: 12px;
    transition: all var(--transition-fast);
}

.toggle-slider:before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--accent-primary);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

/* Link Buttons */
.link-btn {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.link-btn:hover {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
    transform: translateY(-1px);
}

/* Notes Modal */
.notes-content {
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    white-space: pre-wrap;
    font-family: var(--font-primary);
}

/* Loading States */
.loading-spinner {
    display: inline-block;
    width: 12px;
    height: 12px;
    border: 2px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .header-bar {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }
    
    .address-bar {
        padding: var(--spacing-sm);
    }
    
    .modal {
        width: 95%;
        margin: var(--spacing-lg);
    }
    
    .setting-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}

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

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

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

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

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

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

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