:root {
    --gb-darkest: #0F380F;
    --gb-dark: #306230;
    --gb-light: #8BAC0F;
    --gb-lightest: #9BBC0F;
    --bg-primary: #0a0e14;
    --bg-secondary: #111821;
    --bg-tertiary: #1a2130;
    --text-primary: #b8c7d6;
    --text-bright: #d4e0ed;
    --accent-teal: #2d6e6e;
    --accent-purple: #5a3d7a;
    --accent-green: #9BBC0F;
    --border-color: #1e2a3a;
    --glow-green: rgba(155, 188, 15, 0.3);
}

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

body {
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background grid pattern */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: 
        linear-gradient(rgba(155, 188, 15, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(155, 188, 15, 0.02) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
    z-index: 0;
}

#app {
    position: relative;
    z-index: 1;
}

/* Header */
header {
    position: relative;
    background: linear-gradient(135deg, #0d1a1a 0%, #1a1030 50%, #0d1a1a 100%);
    border-bottom: 2px solid var(--accent-green);
    padding: 20px 24px;
    overflow: hidden;
}

.header-inner {
    position: relative;
    z-index: 2;
}

.header-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.gb-icon {
    display: inline-block;
    width: 32px;
    height: 40px;
    background: linear-gradient(180deg, #8a8a9a 0%, #6a6a7a 100%);
    border-radius: 4px 4px 0 0;
    border: 2px solid #555;
    position: relative;
    font-size: 0;
}
.gb-icon::after {
    content: '';
    position: absolute;
    top: 8px; left: 5px;
    width: 18px; height: 16px;
    background: var(--gb-dark);
    border: 2px solid var(--gb-darkest);
    border-radius: 2px;
}

h1 {
    font-family: 'Silkscreen', monospace;
    font-size: 28px;
    font-weight: 700;
    color: var(--accent-green);
    text-shadow: 0 0 20px var(--glow-green), 0 0 40px rgba(155,188,15,0.15);
    letter-spacing: 2px;
}

h1 .accent {
    filter: none;
}

.subtitle {
    font-size: 11px;
    color: var(--accent-teal);
    margin-top: 4px;
    letter-spacing: 3px;
    text-transform: uppercase;
    font-weight: 300;
}

.scanline-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0,0,0,0.15) 2px,
        rgba(0,0,0,0.15) 4px
    );
    pointer-events: none;
    z-index: 1;
}

/* Drop Zone */
.drop-zone {
    padding: 40px 24px;
    display: flex;
    justify-content: center;
}

.cartridge-slot {
    width: 100%;
    max-width: 480px;
    border: 2px dashed var(--accent-teal);
    border-radius: 8px;
    padding: 40px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: linear-gradient(180deg, rgba(45,110,110,0.05) 0%, rgba(45,110,110,0.02) 100%);
    position: relative;
}

.cartridge-slot:hover, .cartridge-slot.dragover {
    border-color: var(--accent-green);
    background: linear-gradient(180deg, rgba(155,188,15,0.08) 0%, rgba(155,188,15,0.02) 100%);
    box-shadow: 0 0 30px rgba(155,188,15,0.1);
    transform: translateY(-2px);
}

.slot-label {
    font-family: 'Silkscreen', monospace;
    font-size: 10px;
    color: var(--accent-teal);
    letter-spacing: 4px;
    margin-bottom: 20px;
    opacity: 0.7;
}

.slot-opening {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.drop-text {
    font-size: 14px;
    color: var(--text-primary);
}

.drop-text strong {
    color: var(--accent-green);
}

.drop-sub {
    font-size: 11px;
    color: #556677;
}

#file-input {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    opacity: 0;
    cursor: pointer;
}

/* ROM Info */
.rom-info {
    display: flex;
    justify-content: center;
    gap: 12px;
    padding: 0 24px 16px;
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 11px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.type-badge {
    background: rgba(155,188,15,0.15);
    border-color: rgba(155,188,15,0.3);
    color: var(--accent-green);
    font-weight: 600;
}

/* Controls */
.controls-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    align-items: flex-end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.control-group label {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: #556677;
    font-weight: 600;
}

.control-group input[type="range"] {
    width: 180px;
    accent-color: var(--accent-green);
    height: 4px;
}

.hex-input {
    width: 90px;
    padding: 4px 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--accent-green);
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    text-align: center;
}

.hex-input:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 8px var(--glow-green);
}

.btn-group {
    display: flex;
    gap: 0;
}

.btn-group button {
    padding: 4px 10px;
    font-size: 11px;
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s;
}

.btn-group button:first-child { border-radius: 4px 0 0 4px; }
.btn-group button:last-child { border-radius: 0 4px 4px 0; }
.btn-group button + button { border-left: none; }

.btn-group button.active, .btn-group button:hover {
    background: rgba(155,188,15,0.15);
    border-color: var(--accent-green);
    color: var(--accent-green);
}

.export-btn {
    padding: 4px 14px;
    font-size: 11px;
    font-family: 'JetBrains Mono', monospace;
    background: rgba(155,188,15,0.1);
    border: 1px solid rgba(155,188,15,0.3);
    border-radius: 4px;
    color: var(--accent-green);
    cursor: pointer;
    transition: all 0.2s;
}
.export-btn:hover {
    background: rgba(155,188,15,0.2);
    box-shadow: 0 0 12px var(--glow-green);
}

.toggle-btn {
    padding: 4px 14px;
    font-size: 11px;
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s;
}
.toggle-btn.active {
    background: rgba(155,188,15,0.15);
    border-color: var(--accent-green);
    color: var(--accent-green);
}

/* Workspace */
.workspace {
    display: flex;
    gap: 0;
    padding: 0;
}

.canvas-wrapper {
    flex: 1;
    overflow: auto;
    position: relative;
    padding: 16px;
    max-height: calc(100vh - 260px);
    min-height: 400px;
}

#tile-canvas {
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    display: block;
    cursor: crosshair;
}

.canvas-scanlines {
    position: absolute;
    top: 16px; left: 16px;
    pointer-events: none;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 1px,
        rgba(0,0,0,0.08) 1px,
        rgba(0,0,0,0.08) 2px
    );
}

.canvas-scanlines.off {
    display: none;
}

/* Side Panel */
.side-panel {
    width: 280px;
    min-width: 280px;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
    max-height: calc(100vh - 260px);
}

.panel-section {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.panel-section h3 {
    font-family: 'Silkscreen', monospace;
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent-teal);
    margin-bottom: 12px;
}

.tile-detail {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#detail-canvas {
    width: 100%;
    max-width: 248px;
    aspect-ratio: 1;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.tile-info {
    font-size: 11px;
    color: #556677;
}

.tile-info p {
    margin: 2px 0;
}

.tile-info .label {
    color: var(--accent-teal);
}

.tile-info .value {
    color: var(--accent-green);
}

.hex-dump {
    font-size: 10px;
    line-height: 1.6;
    color: #445566;
    background: var(--bg-primary);
    padding: 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    word-break: break-all;
    max-height: 120px;
    overflow-y: auto;
}

/* Palette */
.palette-viewer {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.palette-row {
    display: flex;
    flex-wrap: wrap;
    gap: 3px;
}

.palette-color {
    width: 22px;
    height: 22px;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 2px;
    cursor: pointer;
    transition: transform 0.1s;
    position: relative;
}

.palette-color:hover {
    transform: scale(1.3);
    z-index: 2;
    border-color: var(--accent-green);
}

.palette-color .tooltip {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 2px 6px;
    font-size: 9px;
    color: var(--text-bright);
    white-space: nowrap;
    border-radius: 3px;
    margin-bottom: 4px;
}

.palette-color:hover .tooltip {
    display: block;
}

.palette-controls {
    margin-top: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.palette-controls label {
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: #556677;
}

.palette-controls select {
    padding: 4px 8px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
}

.palette-controls select:focus {
    outline: none;
    border-color: var(--accent-green);
}

/* Error */
.error-msg {
    margin: 16px 24px;
    padding: 12px 16px;
    background: rgba(180, 40, 40, 0.15);
    border: 1px solid rgba(180, 40, 40, 0.3);
    border-radius: 4px;
    color: #e55;
    font-size: 12px;
}

/* Footer */
footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    font-size: 11px;
    color: #334455;
    border-top: 1px solid var(--border-color);
    margin-top: 20px;
}

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

footer a:hover {
    color: var(--accent-green);
}

.hidden { display: none !important; }

/* Responsive */
@media (max-width: 900px) {
    .workspace {
        flex-direction: column;
    }
    .side-panel {
        width: 100%;
        min-width: unset;
        border-left: none;
        border-top: 1px solid var(--border-color);
        max-height: unset;
    }
    .canvas-wrapper {
        max-height: 50vh;
    }
    .controls-bar {
        gap: 10px;
    }
    .control-group input[type="range"] {
        width: 120px;
    }
    h1 { font-size: 20px; }
}

@media (max-width: 600px) {
    .controls-bar {
        padding: 12px 16px;
    }
    .canvas-wrapper {
        padding: 8px;
    }
    .panel-section {
        padding: 12px;
    }
    footer {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-teal);
}

/* Selection highlight on tile grid */
.tile-highlight {
    position: absolute;
    border: 2px solid var(--accent-green);
    box-shadow: 0 0 8px var(--glow-green);
    pointer-events: none;
}