/* ========================================
   CircuiTikZ Visual Editor - Styles
   ======================================== */

:root {
    /* Color Palette - Modern Dark Theme */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-elevated: #30363d;

    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;

    --accent-primary: #58a6ff;
    --accent-secondary: #1f6feb;
    --accent-green: #3fb950;
    --accent-orange: #d29922;
    --accent-red: #f85149;
    --accent-purple: #a371f7;

    --border-default: #30363d;
    --border-muted: #21262d;

    /* Gradients */
    --gradient-accent: linear-gradient(135deg, #58a6ff 0%, #a371f7 100%);
    --gradient-surface: linear-gradient(180deg, #21262d 0%, #161b22 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(88, 166, 255, 0.3);

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Layout */
    --header-height: 56px;
    --sidebar-width: 260px;
    --code-panel-height: 180px;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ========================================
   Header
   ======================================== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-default);
    z-index: 100;
}

.header-left,
.header-center,
.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 24px;
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.toolbar-separator {
    width: 1px;
    height: 24px;
    background: var(--border-default);
    margin: 0 var(--space-xs);
}

.tool-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.tool-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.tool-btn.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.tool-btn.danger:hover {
    background: rgba(248, 81, 73, 0.2);
    color: var(--accent-red);
}

/* Grid Control */
.grid-control {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-secondary);
}

.grid-control select {
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 13px;
    cursor: pointer;
    outline: none;
}

.grid-control select:focus {
    border-color: var(--accent-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s ease;
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--text-muted);
}

.btn-icon {
    background: transparent;
    color: var(--text-secondary);
    padding: var(--space-sm);
}

.btn-icon:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-default);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar:last-child {
    border-right: none;
    border-left: 1px solid var(--border-default);
}

.sidebar-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-default);
}

.sidebar-header h2 {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.search-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 13px;
    outline: none;
    transition: border-color 0.15s ease;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-input:focus {
    border-color: var(--accent-primary);
}

/* Component Categories */
.component-categories {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
}

.category {
    margin-bottom: var(--space-sm);
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    text-align: left;
    transition: background 0.15s ease;
}

.category-header:hover {
    background: var(--bg-tertiary);
}

.category-header .arrow {
    transition: transform 0.2s ease;
}

.category.collapsed .category-header .arrow {
    transform: rotate(-90deg);
}

.category-items {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xs);
    padding: var(--space-xs);
    padding-left: var(--space-lg);
}

.category.collapsed .category-items {
    display: none;
}

.component-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-muted);
    border-radius: var(--radius-sm);
    cursor: grab;
    transition: all 0.15s ease;
    user-select: none;
}

.component-item:hover {
    background: var(--bg-elevated);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.component-item:active {
    cursor: grabbing;
}

.component-item svg {
    width: 40px;
    height: 30px;
}

.component-item .name {
    font-size: 10px;
    color: var(--text-secondary);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

/* ========================================
   Canvas Area
   ======================================== */
.canvas-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.canvas-wrapper {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.canvas-wrapper canvas {
    position: absolute;
    top: 0;
    left: 0;
}

#gridCanvas {
    z-index: 1;
}

#mainCanvas {
    z-index: 2;
}

.canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: none;
}

.canvas-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-default);
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.zoom-control {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.zoom-select {
    padding: 2px var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 11px;
    cursor: pointer;
    outline: none;
}

.zoom-select:focus {
    border-color: var(--accent-primary);
}

/* ========================================
   Properties Panel
   ======================================== */
.properties-panel {
    width: 240px;
}

.properties-content {
    flex: 1;
    padding: var(--space-lg);
    overflow-y: auto;
}

.no-selection {
    text-align: center;
    color: var(--text-muted);
    padding: var(--space-xl);
}

.property-group {
    margin-bottom: var(--space-lg);
}

.property-group label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.property-group input,
.property-group select {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 13px;
    outline: none;
}

.property-group input:focus,
.property-group select:focus {
    border-color: var(--accent-primary);
}

.property-row {
    display: flex;
    gap: var(--space-sm);
}

.property-row .property-group {
    flex: 1;
}

.value-input-row {
    display: flex;
    gap: var(--space-xs);
}

/* Transistor Options Checkboxes */
.transistor-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 13px;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--space-xs) 0;
    text-transform: none;
    letter-spacing: normal;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin: 0;
    accent-color: var(--accent-primary);
    cursor: pointer;
}

.checkbox-label:hover {
    color: var(--accent-primary);
}

.option-with-dropdown {
    margin-bottom: var(--space-xs);
}

.option-dropdown {
    margin-top: var(--space-xs);
}

.option-dropdown select {
    width: 100%;
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 12px;
}

/* ========================================
   Code Panel
   ======================================== */
.code-panel {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-default);
    display: flex;
    flex-direction: column;
    max-height: var(--code-panel-height);
    transition: max-height 0.3s ease;
}

.code-panel.collapsed {
    max-height: 44px;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-lg);
    border-bottom: 1px solid var(--border-default);
}

.code-header h3 {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.code-actions {
    display: flex;
    gap: var(--space-sm);
}

.code-content {
    flex: 1;
    overflow: auto;
    padding: var(--space-md);
}

.code-panel.collapsed .code-content {
    display: none;
}

#codeOutput {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-default);
    white-space: pre-wrap;
    word-break: break-word;
}

#codeOutput code {
    color: inherit;
}

/* Syntax highlighting */
.code-keyword {
    color: var(--accent-purple);
}

.code-command {
    color: var(--accent-primary);
}

.code-param {
    color: var(--accent-green);
}

.code-string {
    color: var(--accent-orange);
}

.code-comment {
    color: var(--text-muted);
    font-style: italic;
}

/* ========================================
   Toast Notifications
   ======================================== */
.toast {
    position: fixed;
    bottom: 200px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: var(--space-md) var(--space-xl);
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    background: var(--accent-green);
    color: #fff;
}

.toast.error {
    background: var(--accent-red);
    color: #fff;
}

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

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

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

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

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

.dragging {
    opacity: 0.5;
}

/* Ghost element for drag preview */
.drag-ghost {
    position: fixed;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.8;
    transform: translate(-50%, -50%);
}

/* Selection highlight on canvas */
.component-selected {
    filter: drop-shadow(0 0 4px var(--accent-primary));
}

/* Wire preview during drawing */
.wire-preview {
    stroke: var(--accent-primary);
    stroke-width: 2;
    stroke-dasharray: 5, 5;
    fill: none;
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 1200px) {
    :root {
        --sidebar-width: 220px;
    }

    .properties-panel {
        width: 200px;
    }
}

@media (max-width: 900px) {
    .properties-panel {
        display: none;
    }
}