/* ========================================
   PlotLab - Professional Styles
   ======================================== */

/* ========== CSS Variables ========== */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-primary-light: #eff6ff;
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f7f8fa;
    --color-bg-tertiary: #f9fafb;
    --color-bg-hover: #f3f4f6;
    --color-border: #e5e7eb;
    --color-border-dark: #d0d5dd;
    --color-border-light: #d1d5db;
    --color-text-primary: #0f172a;
    --color-text-secondary: #374151;
    --color-text-tertiary: #4b5563;
    --color-text-muted: #6b7280;
    --color-text-heading: #111827;
    
    /* Spacing */
    --spacing-xs: 0.25rem;   /* 4px */
    --spacing-sm: 0.375rem;  /* 6px */
    --spacing-md: 0.5rem;    /* 8px */
    --spacing-lg: 0.625rem;  /* 10px */
    --spacing-xl: 0.75rem;   /* 12px */
    --spacing-2xl: 0.9375rem;/* 15px */
    --spacing-3xl: 1.25rem;  /* 20px */
    --spacing-4xl: 1.5rem;   /* 24px */
    
    /* Borders */
    --radius-sm: 0.25rem;  /* 4px */
    --radius-md: 0.375rem; /* 6px */
    --radius-lg: 0.5rem;   /* 8px */
    --radius-xl: 0.75rem;  /* 12px */
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 2px 8px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 4px 6px rgba(37, 99, 235, 0.4);
    --shadow-focus: 0 0 0 3px rgba(37, 99, 235, 0.15);
    --shadow-panel: 4px 0 12px rgba(15, 23, 42, 0.08);
    --shadow-toolbar: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-modal: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
    --shadow-inset: inset 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-button: 0 1px 3px rgba(37, 99, 235, 0.3);
    --shadow-selected: 0 0 0 2px rgba(37, 99, 235, 0.1);
    
    /* Typography */
    --font-size-xs: 0.625rem;   /* 10px */
    --font-size-sm: 0.6875rem;  /* 11px */
    --font-size-base: 0.75rem;  /* 12px */
    --font-size-md: 0.8125rem;  /* 13px */
    --font-size-lg: 0.875rem;   /* 14px */
    --font-size-xl: 1rem;       /* 16px */
    --font-size-2xl: 1.125rem;  /* 18px */
    --font-size-close: 1.5rem;  /* 24px */
    
    /* Layout */
    --sidebar-width: 360px;
    --sidebar-width-mobile: 100%;
    
    /* Transitions */
    --transition-fast: all 0.2s;
    
    /* Z-index */
    --z-modal: 5000;
}

/* ========== Dark Theme ========== */
[data-theme="dark"] {
    /* Colors */
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-primary-light: #1e3a5f;
    --color-bg-primary: #1e1e1e;
    --color-bg-secondary: #121212;
    --color-bg-tertiary: #2a2a2a;
    --color-bg-hover: #333333;
    --color-border: #3a3a3a;
    --color-border-dark: #4a4a4a;
    --color-border-light: #444444;
    --color-text-primary: #e0e0e0;
    --color-text-secondary: #b0b0b0;
    --color-text-tertiary: #909090;
    --color-text-muted: #707070;
    --color-text-heading: #f0f0f0;
    
    /* Shadows (adjusted for dark backgrounds) */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 4px 6px rgba(59, 130, 246, 0.3);
    --shadow-focus: 0 0 0 3px rgba(59, 130, 246, 0.25);
    --shadow-panel: 4px 0 12px rgba(0, 0, 0, 0.5);
    --shadow-toolbar: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-modal: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    --shadow-inset: inset 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-button: 0 1px 3px rgba(59, 130, 246, 0.4);
    --shadow-selected: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

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

html {
    font-size: 16px; /* Base for rem units */
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    font-size: var(--font-size-lg);
    overflow: hidden;
}

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

/* ========== Layout ========== */
.container {
    display: flex;
    height: 100vh;
}

/* ========== Toolbar Buttons ========== */
.toolbar__btn {
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
}

.toolbar__btn:hover:not(:disabled) {
    background-color: var(--color-bg-hover);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.toolbar__btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ========== Sidebar ========== */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-bg-primary);
    border-right: 1px solid var(--color-border-dark);
    overflow-y: auto;
    flex-shrink: 0;
    box-shadow: var(--shadow-panel);
}

.sidebar-content {
    padding: var(--spacing-2xl);
}

.sidebar h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-3xl);
    color: var(--color-text-primary);
}

/* ========== Panels ========== */
.panel {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
}

.panel h2 {
    font-size: var(--font-size-md);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-heading);
}

/* ========== Fieldset ========== */
fieldset {
    border: none;
    padding: 0;
    margin: 0;
}

legend {
    font-size: var(--font-size-md);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-heading);
    padding: 0;
}

/* ========== Form Groups (BEM) ========== */
.form__group {
    margin-bottom: var(--spacing-lg);
}

.form__group label {
    display: block;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-tertiary);
}

.form__group input[type="number"],
.form__group input[type="text"],
.form__group select,
.form__group textarea {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    box-shadow: var(--shadow-inset);
    transition: var(--transition-fast);
}

.form__group textarea {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
    font-size: var(--font-size-sm);
    resize: vertical;
    min-height: 90px;
    max-height: 400px;
}

/* Consolidated Focus Styles */
.form__group input:focus,
.form__group textarea:focus,
.form__group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}

.form__group select {
    cursor: pointer;
}

.size-display {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

.form-hint {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    line-height: 1.3;
}

/* ========== Buttons (BEM) ========== */
button {
    cursor: pointer;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    transition: var(--transition-fast);
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-bg-primary);
    width: 100%;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-button);
}

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

.btn--secondary {
    background-color: var(--color-bg-hover);
    color: var(--color-text-secondary);
    width: 100%;
    border: 1px solid var(--color-border-light);
}

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

/* ========== SVG List (BEM) ========== */
.svg-list {
    list-style: none;
    max-height: 200px;
    overflow-y: auto;
}

.svg-list__item {
    padding: var(--spacing-lg);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.svg-list__item:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-border-light);
}

.svg-list__item--selected {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-selected);
}

.svg-list__item .svg-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--color-text-secondary);
}

.svg-list__controls {
    display: flex;
    gap: var(--spacing-xs);
}

.svg-list__controls button {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    width: auto;
    margin: 0;
}

.svg-list__controls button:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-text-muted);
}

.pen-color-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-normal);
    min-width: 80px;
}

.pen-color-select:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-primary);
}

.pen-color-select:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

.hatch-checkbox {
    margin-right: var(--spacing-xs);
    cursor: pointer;
}

/* ========================================
   Project List
   ======================================== */

.project-list {
    list-style: none;
    max-height: 400px;
    overflow-y: auto;
}

.project-list__item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
}

.project-list__item:hover {
    background-color: var(--color-bg-hover);
    transform: translateX(2px);
}

.project-info {
    flex: 1;
}

.project-info strong {
    display: block;
    font-size: var(--font-size-base);
    color: var(--color-text-heading);
    margin-bottom: var(--spacing-xs);
}

.project-info small {
    display: inline-block;
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-xs);
}

.project-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.project-controls button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn--danger {
    background-color: #dc2626;
    color: white;
}

.btn--danger:hover {
    background-color: #b91c1c;
}

/* ========== Zone List (BEM) ========== */
.zone-list {
    list-style: none;
    max-height: 200px;
    overflow-y: auto;
}

.zone-list__item {
    padding: var(--spacing-lg);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.zone-list__item:hover {
    background-color: var(--color-bg-hover);
}

/* ========== Preset Grid/List (BEM) ========== */
.preset-list {
    list-style: none;
    max-height: 200px;
    overflow-y: auto;
}

.preset-grid {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-lg);
}

.preset-grid__card {
    padding: var(--spacing-xl);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
}

.preset-grid__card:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

/* ========== Main Content ========== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg-secondary);
}

.toolbar {
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-xl) var(--spacing-3xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-toolbar);
}

.toolbar h2 {
    font-size: var(--font-size-lg);
    color: var(--color-text-heading);
    font-weight: 600;
}

.toolbar__controls {
    display: flex;
    gap: var(--spacing-lg);
}

.toolbar__controls button {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-bg-hover);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    width: auto;
    margin: 0;
}

.toolbar__controls button:hover {
    background-color: var(--color-border);
    border-color: var(--color-text-muted);
}

/* ========== Canvas Container ========== */
#canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
}

#preview-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* ========== Modal ========== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: var(--z-modal);
    background-color: rgba(15, 23, 42, 0.5);
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-modal);
    width: 80%;
    max-width: 900px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: var(--spacing-2xl) var(--spacing-4xl);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: var(--font-size-xl);
    color: var(--color-text-heading);
    font-weight: 600;
}

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

.modal-header button:hover {
    background-color: var(--color-bg-hover);
    color: var(--color-text-heading);
}

.modal-body {
    padding: var(--spacing-4xl);
    flex: 1;
    overflow: auto;
}

#gcode-content {
    width: 100%;
    height: 100%;
    min-height: 400px;
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-heading);
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-base);
    padding: var(--spacing-xl);
    resize: none;
}

.modal-footer {
    padding: var(--spacing-xl) var(--spacing-4xl);
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: var(--spacing-lg);
    justify-content: flex-end;
}

.modal-footer button {
    width: auto;
    margin: 0;
}

/* ========== Scrollbars ========== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-hover);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-light);
    border-radius: 5px;
}

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

/* ========== G-Code Tabs ========== */
.modal-tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-secondary);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-2xl);
    background-color: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--color-text-secondary);
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    background-color: var(--color-bg-primary);
}

.tab-content {
    display: none;
}

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

/* ========== G-Code Syntax Highlighting ========== */
.gcode-preview {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-heading);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    overflow-x: auto;
    overflow-y: auto;
    white-space: pre;
    min-height: 400px;
    height: 100%;
    width: 100%;
}

.gcode-comment {
    color: #22c55e; /* Green */
    font-style: italic;
}

.gcode-command {
    color: #3b82f6; /* Blue */
    font-weight: 700;
}

.gcode-axis {
    color: #f59e0b; /* Orange */
    font-weight: 600;
}

.gcode-value {
    color: #8b5cf6; /* Purple */
}

.gcode-param {
    color: #ec4899; /* Pink */
    font-weight: 600;
}

/* Dark theme adjustments for G-Code */
[data-theme="dark"] .gcode-comment {
    color: #4ade80;
}

[data-theme="dark"] .gcode-command {
    color: #60a5fa;
}

[data-theme="dark"] .gcode-axis {
    color: #fbbf24;
}

[data-theme="dark"] .gcode-value {
    color: #a78bfa;
}

[data-theme="dark"] .gcode-param {
    color: #f472b6;
}

/* ========== Validation Panel ========== */
.validation-panel {
    background-color: var(--color-bg-tertiary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-2xl);
}

.validation-summary {
    padding: var(--spacing-lg) var(--spacing-2xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.validation-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #10b981;
}

.validation-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #f59e0b;
}

.validation-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #ef4444;
}

[data-theme="dark"] .validation-success {
    background-color: #064e3b;
    color: #a7f3d0;
    border-color: #10b981;
}

[data-theme="dark"] .validation-warning {
    background-color: #78350f;
    color: #fde68a;
    border-color: #f59e0b;
}

[data-theme="dark"] .validation-error {
    background-color: #7f1d1d;
    color: #fecaca;
    border-color: #ef4444;
}

.validation-section {
    margin-top: var(--spacing-lg);
}

.validation-section h4 {
    font-size: var(--font-size-sm);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-heading);
}

.validation-section ul {
    list-style: none;
    padding-left: 0;
}

.validation-section li {
    padding: var(--spacing-sm) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
}

.validation-section li:last-child {
    border-bottom: none;
}

.validation-errors li::before {
    content: "❌ ";
    margin-right: var(--spacing-sm);
}

.validation-warnings li::before {
    content: "⚠️ ";
    margin-right: var(--spacing-sm);
}

/* ========================================
   Collision Warning Banner
   ======================================== */

.collision-warning {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: 0 var(--spacing-xl) var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, #ff6b6b, #ff4757);
    border: 2px solid #ee5a6f;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.collision-warning__icon {
    font-size: 24px;
    line-height: 1;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.collision-warning__content {
    flex: 1;
    color: white;
    font-size: var(--font-size-sm);
}

.collision-warning__content strong {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.collision-warning__dismiss {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    font-size: 20px;
    font-weight: bold;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-normal);
    padding: 0;
    line-height: 1;
}

.collision-warning__dismiss:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

/* ========================================
   Responsive Design
   ======================================== */

/* ========== Tablet (768px and below) ========== */
@media (max-width: 768px) {
    .sidebar {
        width: var(--sidebar-width-mobile);
        border-right: none;
        border-bottom: 1px solid var(--color-border-dark);
        max-height: 40vh;
    }
    
    .container {
        flex-direction: column;
    }
    
    .toolbar h2 {
        font-size: var(--font-size-base);
    }
    
    .toolbar__controls {
        gap: var(--spacing-md);
    }
    
    .toolbar__controls button {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }
    
    .modal-content {
        width: 95%;
        max-height: 90vh;
    }
}

/* ========== Mobile (480px and below) ========== */
@media (max-width: 480px) {
    html {
        font-size: 14px; /* Reduce base size for mobile */
    }
    
    .sidebar-content {
        padding: var(--spacing-lg);
    }
    
    .panel {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }
    
    button {
        min-height: 44px; /* Touch-friendly */
        min-width: 44px;
    }
    
    .toolbar {
        padding: var(--spacing-lg);
    }
    
    .toolbar__controls {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .modal-content {
        width: 100%;
        max-width: 100%;
        border-radius: 0;
        max-height: 100vh;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--spacing-lg);
    }
}