:root {
    --bg-base: #100805;
    --bg-panel: #1A0F0A;
    --bg-surface: #24140D;
    --bg-hover: #331C12;

    --text-main: #FDF9F7;
    --text-muted: #A38C82;

    --border-color: #331C12;
    --border-hover: #E17055;

    --primary: #E17055;
    --primary-hover: #D65A3D;
    --secondary: #FAB1A0;
    --accent: #00CEC9;

    --danger: #FF7675;
    --danger-hover: #D63031;

    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.5);

    --transition: all 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-main);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
}

/* --- Layout --- */
.app-layout {
    display: flex;
    height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
    width: 320px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary);
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.control-panel {
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 28px;
    flex: 1;
}

/* Hide scrollbar for cleanly designed sidebar */
.scrollable {
    overflow-y: auto;
}

.scrollable::-webkit-scrollbar {
    width: 6px;
}

.scrollable::-webkit-scrollbar-track {
    background: var(--bg-panel);
}

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

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

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

label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    justify-content: space-between;
}

.range-val {
    color: var(--primary);
    font-weight: 600;
}

/* --- Controls --- */
.stepper-row {
    display: flex;
    gap: 16px;
}

.stepper-box {
    flex: 1;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stepper-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
}

.stepper-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.stepper-controls button {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 1.2rem;
    cursor: pointer;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: var(--transition);
}

.stepper-controls button:hover {
    background-color: rgba(225, 112, 85, 0.1);
}

.stepper-controls input {
    width: 40px;
    text-align: center;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-weight: 600;
    font-family: inherit;
    font-size: 1rem;
}

.stepper-controls input:focus {
    outline: none;
}

.stepper-controls input[type=number]::-webkit-inner-spin-button,
.stepper-controls input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.range-box {
    display: flex;
    align-items: center;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-surface);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    transition: var(--transition);
}

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

/* Color Picker */
.color-picker-wrap {
    display: flex;
    align-items: center;
    gap: 16px;
}

input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    background: transparent;
    padding: 0;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

input[type="color"]:hover::-webkit-color-swatch {
    border-color: var(--primary);
}

.color-presets {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.color-preset {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.color-preset:hover {
    transform: scale(1.1);
    border-color: var(--primary);
}

.color-preset.active {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(225, 112, 85, 0.3);
}

.btn-clear-preset {
    font-size: 0.7rem;
    font-weight: bold;
}

/* Buttons */
.export-actions {
    display: flex;
    gap: 8px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    font-family: inherit;
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--bg-surface);
    color: var(--text-muted);
}

.btn-primary {
    background-color: var(--primary);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-surface);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

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

.btn-outline {
    background: transparent;
    border: 1px dashed var(--border-color);
    color: var(--text-muted);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-sm {
    padding: 8px 12px;
    font-size: 0.8rem;
}

.btn-danger {
    background-color: transparent;
    color: var(--danger);
    border: 1px solid rgba(255, 118, 117, 0.3);
}

.btn-danger:hover {
    background-color: rgba(255, 118, 117, 0.1);
    border-color: var(--danger);
}

/* --- Workspace --- */
.workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    background-color: var(--bg-base);
    background-image: radial-gradient(var(--border-color) 1px, transparent 1px);
    background-size: 32px 32px;
}

.workspace-header {
    height: 72px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 32px;
    background-color: rgba(26, 15, 10, 0.8);
    backdrop-filter: blur(8px);
    z-index: 5;
}

.search-box {
    position: relative;
    width: 300px;
}

.search-box svg {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 10px 16px 10px 44px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.9rem;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(225, 112, 85, 0.1);
}

.view-toggles {
    display: flex;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
}

.view-toggle {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 8px 16px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.view-toggle:hover {
    color: var(--text-main);
}

.view-toggle.active {
    background-color: var(--bg-hover);
    color: var(--primary);
}

/* --- Canvas Area --- */
.canvas-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
    padding: 40px;
    position: relative;
}

.canvas-container.dragover {
    background-color: rgba(225, 112, 85, 0.05);
}

.canvas-container.dragover::after {
    content: '';
    position: absolute;
    top: 20px;
    right: 20px;
    bottom: 20px;
    left: 20px;
    border: 2px dashed var(--primary);
    border-radius: var(--radius);
    pointer-events: none;
}

.empty-state {
    text-align: center;
    max-width: 400px;
    cursor: pointer;
    padding: 60px;
    border-radius: var(--radius);
    border: 2px dashed var(--border-color);
    transition: var(--transition);
}

.empty-state:hover {
    border-color: var(--primary);
    background-color: rgba(225, 112, 85, 0.02);
}

.empty-icon {
    color: var(--primary);
    margin-bottom: 24px;
    display: inline-block;
}

.shadow-pulse {
    animation: floating 3s ease-in-out infinite;
}

@keyframes floating {
    0% {
        transform: translateY(0px);
        filter: drop-shadow(0 5px 15px rgba(225, 112, 85, 0.2));
    }

    50% {
        transform: translateY(-10px);
        filter: drop-shadow(0 25px 15px rgba(225, 112, 85, 0.1));
    }

    100% {
        transform: translateY(0px);
        filter: drop-shadow(0 5px 15px rgba(225, 112, 85, 0.2));
    }
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
    font-weight: 600;
}

.empty-state p {
    color: var(--text-muted);
}

/* --- Grid Sheet --- */
.grid-sheet-wrapper {
    background: transparent;
    border-radius: var(--radius);
    overflow: visible;
    position: relative;
}

.grid-sheet-scale {
    transition: transform 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform-origin: center center;
}

.grid-sheet {
    display: grid;
    /* Intentionally injected inline via JS based on row/col settings */
    background: transparent;
    padding: 0;
    /* Handled programmatically via JS for canvas accuracy */
}

.icon-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    position: relative;
    border-radius: 8px;
    transition: border-color 0.2s;
}

/* Checkered background for transparent SVGs */
.icon-cell::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    border-radius: 8px;
    background-image:
        linear-gradient(45deg, #1A0F0A 25%, transparent 25%),
        linear-gradient(-45deg, #1A0F0A 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #1A0F0A 75%),
        linear-gradient(-45deg, transparent 75%, #1A0F0A 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    z-index: 0;
}

.icon-cell svg {
    position: relative;
    z-index: 1;
    /* Color injected inline */
}

/* SVG Object overrides for color masking */
.svg-wrapper {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-cell-actions {
    position: absolute;
    top: 4px;
    right: 4px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    opacity: 0;
    z-index: 5;
    transition: opacity 0.2s;
}

.icon-cell:hover .icon-cell-actions {
    opacity: 1;
}

.cell-action-btn {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.cell-action-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.icon-cell.hidden {
    display: none !important;
}

.toast {
    position: fixed;
    bottom: -60px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--text-main);
    color: var(--bg-base);
    padding: 12px 24px;
    border-radius: 24px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: bottom 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    pointer-events: none;
}

.toast.show {
    bottom: 32px;
}