:root {
    /* Motus Palette */
    --color-bg: #ffffff;
    --color-text-main: #1a1a1a;
    --color-text-muted: #555555;
    --color-accent: #1484e6;
    --color-accent-dark: #0f6cb8;
    --color-bg-track: #f7f9fb;
    --color-border: #e0e0e0;
    --font-mono: 'Space Mono', monospace;
    --radius-md: 12px;
}

* {
    box-sizing: border-box;
}

::selection {
    background: var(--color-accent);
    color: #ffffff;
}

/* Minimal Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #e0e0e0;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #bdbdbd;
}

body {
    font-family: var(--font-mono);
    background-color: var(--color-bg);
    color: var(--color-text-main);
    margin: 0;
    padding: 0;
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: grid;
    grid-template-columns: 400px 1fr;
    width: 100%;
    height: 100%;
}

@media (max-width: 800px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 50vh;
        /* split canvas / settings */
    }

    .sidebar {
        border-right: none;
        border-top: 1px solid var(--color-border);
        order: 2;
    }

    .canvas-wrapper {
        order: 1;
    }
}

/* Sidebar */
.sidebar {
    background-color: #ffffff;
    border-right: 1px solid var(--color-border);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    overflow-y: auto;
    z-index: 10;
    box-shadow: 4px 0 12px rgba(0, 0, 0, 0.02);
}

header h1 {
    font-size: 1.25rem;
    margin: 0 0 0.5rem 0;
    font-weight: 700;
    letter-spacing: -0.5px;
}

header p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.4;
}

header a {
    color: var(--color-accent);
    text-decoration: none;
}

/* Section Headings */
.section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 8px;
    margin-bottom: 12px;
    font-weight: 700;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 8px;
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.control-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

/* Tighter inputs row */
.inputs-compact {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Inputs & Sliders */
input[type="number"] {
    padding: 6px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-family: 'Space Mono', monospace;
    width: 70px;
    font-size: 0.85rem;
    text-align: center;
    outline: none;
    transition: border-color 0.2s;
}

input[type="number"]:focus {
    border-color: var(--color-accent);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Motus-style Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 42px;
    height: 24px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .3s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

input:checked+.slider:before {
    transform: translateX(18px);
}

button {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text-main);
    padding: 8px 12px;
    border-radius: 8px;
    font-family: var(--font-mono);
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
}

button:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: #f0f7ff;
}

button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

button.primary {
    background-color: var(--color-accent);
    color: white;
    border: none;
}

button.primary:hover {
    background-color: var(--color-accent-dark);
}

/* Removed button.danger:hover to keep it blue */

button.icon-only {
    padding: 6px;
}

/* Tool Toggle */
.tool-toggle {
    display: flex;
    background: var(--color-bg-track);
    padding: 4px;
    border-radius: var(--radius-md);
    gap: 4px;
}

.tool-option {
    flex: 1;
    padding: 8px;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.tool-option.active {
    background: white;
    color: var(--color-accent);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* Output Area */
.output-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 12px;
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.output-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

.copy-actions {
    display: flex;
    gap: 6px;
}

.copy-btn {
    height: 24px;
    padding: 0 8px;
    font-size: 0.7rem;
}

.copy-btn .material-symbols-outlined {
    font-size: 14px;
}

textarea {
    width: 100%;
    height: 70px;
    padding: 10px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    background-color: var(--color-bg-track);
    color: var(--color-text-muted);
    line-height: 1.4;
    resize: vertical;
}

textarea:focus {
    outline: 1px solid var(--color-accent);
    background-color: white;
}

/* Canvas Area */
.canvas-wrapper {
    background-color: var(--color-bg-track);
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    /* Hide overflow for pan/zoom */
    touch-action: none;
    /* Prevent browser handling */

    /* Dots Pattern */
    background-image:
        radial-gradient(var(--color-border) 1px, transparent 1px);
    background-size: 20px 20px;
}

canvas {
    /* Canvas is now a viewport, transparent background */
    background-color: transparent;
    /* No shadow on canvas element itself, we draw "paper" with shadow */
    box-shadow: none;
    cursor: crosshair;
    display: block;
    touch-action: none;
}

/* Grid Overlay on Canvas - REMOVED CSS GRID, Drawn in Canvas */
/* canvas.show-grid {} */

.canvas-wrapper.mode-select canvas {
    cursor: default;
}

#reset-view-btn {
    position: absolute;
    bottom: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 1px solid var(--color-border);
    z-index: 200;
    color: var(--color-text-muted);
    transition: all 0.2s;
}

#reset-view-btn:hover {
    color: var(--color-accent);
    transform: scale(1.1);
}

/* Helpers */
/* Canvas is now fullscreen in wrapper, but we still need brush visuals to act correctly */
/* They are updated in js */
#brush-helper {
    position: absolute;
    pointer-events: none;
    border: 2px solid rgba(20, 132, 230, 0.8);
    background-color: rgba(20, 132, 230, 0.1);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    display: none;
    z-index: 10000000;
    /* High Z-index */
    transition: width 0.1s, height 0.1s, opacity 0.2s;
    ;
}

#desktop-hint {
    transition: opacity 1s ease-in-out;
}

#brush-point {
    position: absolute;
    width: 8px;
    height: 8px;
    background-color: var(--color-accent);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    display: none;
    z-index: 101;
}

#mouse-target {
    position: absolute;
    width: 6px;
    height: 6px;
    border: 2px solid rgba(0, 0, 0, 0.4);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    display: none;
    z-index: 102;
}

#desktop-hint {
    position: absolute;
    bottom: 12px;
    left: 16px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    opacity: 0.7;
    pointer-events: none;
    transition: opacity 1s ease-in-out;
}

#canvas-placeholder {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Only show on devices with fine pointer (mouse) */
@media (pointer: coarse) {
    #desktop-hint {
        display: none;
    }
}

/* Collapsible Sections */
.section-header-collapsible {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 8px;
    margin-bottom: 8px;
    transition: color 0.2s;
}

.section-header-collapsible:hover .section-title {
    color: var(--color-accent);
}

.dropdown-icon {
    font-size: 20px;
    color: var(--color-text-muted);
    transition: transform 0.3s;
}

.ref-image-item {
    transition: box-shadow 0.2s;
}

.ref-image-item:hover {
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1) !important;
}

/* Coord Styles */
.coord-container {
    display: flex;
    flex-direction: column;
    font-family: 'Space Mono', monospace;
    font-size: 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-bg-track);
    overflow: hidden;
    margin-top: 4px;
}

.coord-prefix {
    background: var(--color-bg);
    padding: 6px 8px;
    border-bottom: 1px solid #eee;
    color: #555;
    font-weight: 600;
}

.coord-textarea {
    border: none;
    padding: 8px;
    outline: none;
    font-family: 'Space Mono', monospace;
    resize: vertical;
    min-height: 60px;
    width: 100%;
    box-sizing: border-box;
    color: var(--color-text-main);
    display: block;
    background: var(--color-bg-track);
}

.coord-suffix {
    background: var(--color-bg);
    padding: 6px 8px;
    border-top: 1px solid #eee;
    color: #888;
}

/* Coordinate Inputs Refinement */
.coord-textarea {
    border-radius: 0 !important;
}

.coord-textarea:focus {
    outline: 2px solid var(--color-accent) !important;
    z-index: 5;
    position: relative;
}

textarea:disabled {
    background-color: #fafafa;
    color: #bbb;
    cursor: not-allowed;
}

/* Allow outline to be visible if possible, though overflow hidden on container might clip it. 
   We'll set overflow to visible on the container if needed, but let's try this first. 
   Actually, let's override the container overflow if strictly needed, but let's stick to the request.
*/
/* Desmos & Extra Controls */
.control-row.spaced-top {
    margin-top: 12px;
    margin-bottom: 4px;
}

.control-row.spaced-small {
    margin-top: 8px;
}

.help-text {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    margin: 4px 0 12px 0;
}

/* Refactored Utility Classes */
.section-title.reset {
    border: none;
    margin: 0;
    padding: 0;
}

.section-title.flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.dec-input-container {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-right: 10px;
}

.dec-label {
    font-size: 0.7rem;
    text-transform: none;
    font-weight: 400;
}

.dec-input {
    width: 40px;
    padding: 2px 4px;
    font-size: 0.8rem;
}

.warning-box {
    color: var(--color-accent);
    font-size: 0.8rem;
    margin-top: 8px;
    display: none;
    background: rgba(20, 132, 230, 0.1);
    padding: 8px;
    border-radius: 4px;
    border: 1px solid rgba(20, 132, 230, 0.2);
}

.spacer-bottom {
    height: 24px;
}

.w-100 { width: 100%; }
.mt-4 { margin-top: 4px; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.gap-8 { gap: 8px; }
.flex-1 { flex: 1; }


/* Export Section Refactor */
.export-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}
.no-margin { margin: 0; }
.divider {
    border-top: 1px solid #eee;
    margin: 8px 0;
}
.import-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}
.import-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    min-width: 20px;
    font-weight: bold;
}
.import-input {
    font-family: var(--font-mono);
    flex: 1;
    padding: 4px;
    font-size: 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
}


/* Refactor Round 2 */
.input-separator {
    color: var(--color-text-muted);
}
.tool-icon {
    font-size: 18px;
}
.button-group {
    display: flex; gap: 8px; margin-top: 8px;
}
.hidden { display: none; }
.ref-list {
    display: flex; flex-direction: column; gap: 8px;
}
.help-text-top {
    font-size: 0.7rem; 
    color: var(--color-text-muted); 
    margin: 8px 0 0 0;
}
.warning-icon {
    vertical-align: middle; font-size: 16px; margin-right: 4px;
}
.sidebar-footer {
    margin-top: auto; 
    padding-top: 20px; 
    border-top: 1px solid var(--color-border);
}
.hint-icon {
    vertical-align: middle; font-size: 14px;
}