:root {
    --bg-color: #121212;
    --panel-bg: #1e1e1e;
    --border-color: #2c2c2c;
    --accent-color: #ff6600;
    --text-color: #e0e0e0;
    --header-bg: #181818;
    --button-bg: #2a2a2a;
    --button-hover: #3a3a3a;
    --atari-blue: #ff6600;
    --font-ui: 'Fira Sans', sans-serif;
    --font-heading: 'Fira Sans', sans-serif;
    --font-mono: 'Fira Code', monospace;
    --sidebar-left-width: 340px;
    --sidebar-right-width: 250px;
    --main-gap: 20px;
    --main-padding: 20px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-ui);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

@media (min-width: 1920px) {
    body {
        height: 100vh;
        overflow: hidden;
    }
}

header {
    background-color: var(--header-bg);
    border-bottom: 2px solid var(--border-color);
    padding: 10px 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
}

.header-title {
    display: flex;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: baseline;
    gap: 8px;
    user-select: none;
    cursor: default;
}

.logo-brand {
    font-size: 24px;
    font-weight: 800;
    color: var(--accent-color);
    letter-spacing: -1px;
    text-shadow: 0 0 10px rgba(255, 102, 0, 0.3);
}

/* .logo-model removed */

.logo-desc {
    font-size: 14px;
    font-weight: 500;
    color: #fff;
    font-family: var(--font-ui);
    text-transform: lowercase;
    letter-spacing: 0.5px;
}

.mode-switch {
    display: flex;
    background-color: #000;
    padding: 3px;
    border-radius: 8px;
    border: 1px solid #333;
    gap: 0;
}

.mode-switch input[type="radio"] {
    display: none;
}

.mode-switch label {
    padding: 6px 15px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    color: #888;
    border-radius: 6px;
    transition: all 0.2s ease;
    text-align: center;
    min-width: 80px;
}

.mode-switch input[type="radio"]:checked+label {
    background-color: var(--accent-color);
    color: #000;
    box-shadow: 0 0 10px rgba(255, 102, 0, 0.4);
}

.mode-switch label:hover:not(:has(prev:checked)) {
    color: #fff;
}

.header-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

#btn-undo {
    color: var(--accent-color);
    border-color: #444;
    padding: 8px 12px;
}

#btn-undo:hover {
    background-color: rgba(255, 102, 0, 0.1);
    border-color: var(--accent-color);
}

button {
    background-color: var(--button-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

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

button.primary {
    background-color: var(--atari-blue);
    border-color: #cc5200;
    color: #121212;
    font-weight: 600;
}

button.primary:hover {
    background-color: #e65c00;
    color: #121212;
}

button:disabled,
button.primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--button-bg);
    border-color: var(--border-color);
    color: #777;
    box-shadow: none;
    transform: none;
}

button:disabled:hover,
button.primary:disabled:hover {
    background-color: var(--button-bg);
    border-color: var(--border-color);
    color: #777;
}

/* Grouped Buttons */
button.font-btn {
    background-color: #1e3a5f;
    border-color: #2c5282;
    color: #ebf8ff;
}

button.font-btn:hover {
    background-color: #2c5282;
    border-color: #4299e1;
    color: #fff;
}

button.map-btn {
    background-color: #1c4532;
    border-color: #276749;
    color: #f0fff4;
}

button.map-btn:hover {
    background-color: #276749;
    border-color: #48bb78;
    color: #fff;
}

button.sys-btn {
    background-color: #2d3748;
    border-color: #4a5568;
    color: #edf2f7;
}

button.sys-btn:hover {
    background-color: #4a5568;
    border-color: #a0aec0;
    color: #fff;
}

main {
    display: flex;
    flex: 1;
    padding: var(--main-padding);
    gap: var(--main-gap);
}

@media (min-width: 1920px) {
    main {
        overflow: hidden;
    }
}

@media (max-width: 1919px) {
    main {
        display: grid !important;
        grid-template-columns: 1fr 1fr 1fr;
        grid-auto-rows: auto;
        gap: var(--main-gap);
        height: auto;
        overflow: visible;
        padding-bottom: 40px;
    }

    .main-content,
    aside.sidebar-left,
    aside.sidebar-right {
        display: contents !important;
    }

    .map-editor-panel {
        grid-column: 1 / -1;
        order: -1;
    }

    .char-editor-panel {
        min-width: 0;
    }

    .font-set-panel {
        min-width: 0;
    }

    .object-library-panel {
        min-width: 0;
        height: 500px;
    }
}

aside.sidebar-left {
    display: flex;
    flex-direction: column;
    gap: 15px;
    /* Reduced gap */
    width: var(--sidebar-left-width);
    flex-shrink: 0;
    min-height: 0;
    overflow: hidden;
}

aside.sidebar-right {
    display: flex;
    flex-direction: column;
    gap: 15px;
    /* Reduced gap */
    width: var(--sidebar-right-width);
    flex-shrink: 0;
    min-height: 0;
    overflow: hidden;
}

/* Specific content handling for sidebar panels to avoid any scrolling */
aside .panel-content {
    padding: 10px;
    /* Reduced padding from 20px */
    overflow: hidden;
    /* Force hide any rogue scrollbars */
}

/* Exception for Object Library which NEEDS scrolling */
aside.sidebar-right .object-library-panel .panel-content {
    overflow-y: auto;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.tool-btn i {
    display: inline-block;
    line-height: 1;
}

.rotate-90 {
    transform: rotate(90deg);
}

.panel {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    min-height: 0;
}

.panel-header {
    background-color: var(--header-bg);
    padding: 12px 18px;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: var(--text-color);
}

.tool-info {
    font-size: 13px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Modern Controls in Toolbar */
.toolbar-control {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #181818;
    padding: 4px 10px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.toolbar-control label {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    user-select: none;
}

/* Custom Checkbox */
.custom-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border: 2px solid #555;
    border-radius: 4px;
    background-color: #121212;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
}

.custom-checkbox:checked {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.custom-checkbox:checked::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 1px;
    width: 4px;
    height: 8px;
    border: solid #121212;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Custom Color Input */
.custom-color-input {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid #555;
    border-radius: 4px;
    padding: 0;
    cursor: pointer;
    background: none;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.custom-color-input::-webkit-color-swatch-wrapper {
    padding: 0;
}

.custom-color-input::-webkit-color-swatch {
    border: none;
    border-radius: 2px;
}

.custom-color-input:hover {
    transform: scale(1.1);
    border-color: var(--accent-color);
}


.panel-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    /* Changed from center to prevent upward overlap */
    padding: 20px;
    background-color: #0b0f19;
    overflow: auto;
    min-height: 0;
}

.panel-footer {
    padding: 8px 15px;
    font-size: 13px;
    color: #aaa;
    border-top: 1px solid var(--border-color);
    background-color: #1a1a1a;
}

.canvas-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Crucial for retro look */
canvas {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.8);
    cursor: crosshair;
}

#char-editor-canvas {
    width: 256px;
    height: 256px;
    border: 1px solid #444;
}

#font-set-canvas {
    width: 290px;
    height: 290px;
    border: 1px solid #444;
}

#map-canvas {
    width: 960px;
    min-width: 960px;
    border: none;
    /* remove border from canvas, put on wrapper */
    background-color: #000;
    display: block;
}

.map-container {
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.map-wrapper {
    position: relative;
    border: 2px solid #555;
    width: 960px;
    height: fit-content;
}

/* Palette Registers */
.palette-registers {
    display: flex;
    justify-content: space-evenly;
    background-color: var(--header-bg);
    padding: 8px 10px 25px 10px;
    /* Restored bottom padding to fit labels */
    border-bottom: 2px solid var(--border-color);
}

.color-slot {
    width: 32px;
    height: 32px;
    border: 2px solid #555;
    cursor: pointer;
    border-radius: 4px;
    transition: transform 0.1s, border-color 0.1s;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.color-slot:hover {
    transform: scale(1.1);
}

.color-slot.active {
    border-color: var(--accent-color);
    box-shadow: 0 0 8px var(--accent-color);
}

.color-label {
    position: absolute;
    bottom: -18px;
    font-size: 10px;
    font-family: var(--font-mono);
    color: #94a0b8;
    text-align: center;
    white-space: nowrap;
    pointer-events: none;
}

/* Palette Popup */
#palette-popup {
    position: absolute;
    background-color: var(--panel-bg);
    border: 2px solid var(--border-color);
    padding: 10px;
    border-radius: 6px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.8);
    z-index: 1000;
    width: 289px;
}

#palette-popup.hidden {
    display: none;
}

.palette-popup-header {
    font-size: 13px;
    margin-bottom: 12px;
    text-align: center;
    color: var(--text-color);
    font-weight: 600;
}

#palette-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(16, 1fr);
    gap: 1px;
    background-color: #000;
    border: 1px solid #444;
}

.palette-color {
    width: 32px;
    height: 18px;
    cursor: pointer;
}

.palette-color:hover {
    outline: 1px solid white;
    z-index: 2;
}

#object-library-list li {
    padding: 8px;
    border-bottom: 1px solid #333;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.2s;
}

#object-library-list li:hover {
    background-color: #222;
}

#object-library-list li.active {
    background-color: #003366;
    border-left: 3px solid var(--accent-color);
}

.object-info-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
    flex: 1;
    min-width: 0;
    /* Important for ellipsis */
    overflow: hidden;
}

.object-name-label {
    font-size: 13px;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
    display: block;
}

.object-thumbnail {
    background: #000;
    max-width: 160px;
    height: auto;
    display: block;
    image-rendering: pixelated;
    border-radius: 2px;
}

.delete-object-btn {
    background: none;
    border: none;
    color: #ff4444;
    cursor: pointer;
    font-size: 16px;
    padding: 0 5px;
}

.delete-object-btn:hover {
    color: #ff0000;
    transform: scale(1.1);
}

#export-dialog::backdrop,
#instruction-modal::backdrop,
#options-modal::backdrop {
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(3px);
}

#instruction-modal {
    max-width: 75vw;
    width: 75%;
}

.help-modal {
    background-color: #1a1a1a;
    color: #eee;
    border: 2px solid var(--accent-color);
    border-radius: 12px;
    padding: 0;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
    overflow: hidden;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.help-modal .modal-header {
    background-color: #222;
    padding: 15px 20px;
    border-bottom: 1px solid #333;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.help-modal .modal-header h2 {
    margin: 0;
    color: var(--accent-color);
    font-size: 1.2rem;
}

.help-modal .modal-body {
    padding: 20px;
    overflow-y: auto;
    max-height: calc(80vh - 120px);
    line-height: 1.6;
}

.help-modal section {
    margin-bottom: 25px;
}

.help-modal h3 {
    margin-top: 0;
    color: #fff;
    border-bottom: 1px solid #444;
    padding-bottom: 8px;
    margin-bottom: 12px;
    font-size: 1rem;
}

.help-modal ul {
    padding-left: 20px;
}

.help-modal li {
    margin-bottom: 10px;
}

.help-modal kbd {
    background-color: #444;
    border-radius: 4px;
    border: 1px solid #666;
    padding: 2px 6px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: #fff;
    box-shadow: 0 2px 0 #222;
}

.help-modal .modal-footer {
    padding: 15px 20px;
    background-color: #222;
    border-top: 1px solid #333;
    text-align: right;
}

.help-modal .close-btn {
    background: none;
    border: none;
    color: #888;
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.2s;
}

.help-modal .close-btn:hover {
    color: #fff;
}

.confirmation-modal {
    max-width: 400px;
}

.confirmation-modal .modal-body {
    padding: 20px;
    text-align: center;
    font-size: 1.1rem;
}

.confirmation-modal .modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Character Editor Tools */
.char-editor-container {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.char-tools {
    display: flex;
    flex-direction: column;
    gap: 5px;
    flex-shrink: 0;
}

.tool-btn {
    width: 28px !important;
    height: 28px !important;
    min-width: 28px !important;
    min-height: 28px !important;
    padding: 0 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    font-size: 16px !important;
    background-color: var(--button-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s;
    overflow: visible;
}

.map-editor-container {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 20px;
    justify-content: center;
}

.map-tools {
    display: flex;
    flex-direction: column;
    gap: 5px;
    flex-shrink: 0;
    margin-top: 5px;
}

.tool-btn:hover {
    background-color: var(--button-hover);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.tool-btn.danger:hover {
    background-color: #833;
    border-color: #f44;
    color: #fff;
}

/* CRT Preview Modal */
.crt-modal {
    max-width: 100vw;
    max-height: 100vh;
    width: auto;
    height: auto;
    border-radius: 0;
    background: #000;
    overflow: hidden;
    /* Hide scrollbars */
    border: none;
    padding: 0;
    margin: auto;
}

.crt-modal::backdrop {
    background: #000;
}

.crt-modal-body {
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
    padding: 0 !important;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

.crt-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 95%;
    max-height: 95%;
}

.crt-screen {
    position: relative;
    background: #000;
    display: flex;
    box-shadow: 0 0 100px rgba(255, 255, 255, 0.05);
}

#crt-canvas {
    max-width: 100%;
    max-height: 100vh;
    height: auto;
    display: block;
    image-rendering: auto;
}

.crt-controls {
    position: absolute;
    bottom: 15px;
    width: 100%;
    text-align: center;
    color: #444;
    font-size: 11px;
    font-family: inherit;
    pointer-events: none;
    z-index: 20;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Responsive Design */
@media (max-width: 1600px) {
    :root {
        --sidebar-left-width: 300px;
        --sidebar-right-width: 220px;
        --main-gap: 15px;
        --main-padding: 15px;
    }
}

@media (max-width: 1200px) {
    header {
        padding: 5px 10px;
        gap: 5px;
    }

    .logo-brand {
        font-size: 20px;
    }

    .logo-desc {
        display: none;
    }
}