:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-elevated: #1c2128;
    --border: #30363d;
    --border-focus: #58a6ff;
    --accent: #58a6ff;
    --accent-glow: rgba(88, 166, 255, 0.4);
    --accent-secondary: #3fb950;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --danger: #f85149;
    --warning: #d29922;
    --success: #3fb950;
    --info: #58a6ff;
    --scrollbar-bg: #161b22;
    --scrollbar-thumb: #30363d;
    --panel-width-left: 260px;
    --panel-width-right: 300px;
    --toolbar-height: 48px;
    --statusbar-height: 28px;
    --radius-sm: 4px;
    --radius: 6px;
    --radius-lg: 8px;
    --transition: 0.15s ease;
    --font-mono: 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
}

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

html, body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-sans);
    font-size: 13px;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--scrollbar-bg);
}
::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

input, select, button, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--radius);
    font-size: 12px;
    font-weight: 500;
    transition: all var(--transition);
    white-space: nowrap;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
}
button:hover {
    background: var(--border);
    border-color: var(--text-muted);
}
button:active {
    transform: scale(0.97);
}
button:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 1px;
}
button.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
button.primary:hover {
    background: #4090e0;
    box-shadow: 0 0 12px var(--accent-glow);
}
button.danger {
    background: var(--danger);
    border-color: var(--danger);
    color: #fff;
}
button.danger:hover {
    background: #d93a33;
}
button.icon-only {
    padding: 6px;
    min-width: 32px;
    min-height: 32px;
    font-size: 16px;
}
button.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 8px 6px;
    min-width: 48px;
    font-size: 10px;
    border-radius: var(--radius);
}
button.tool-btn .icon {
    font-size: 18px;
}
button.tool-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    box-shadow: 0 0 10px var(--accent-glow);
}
button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

input[type="text"],
input[type="number"],
input[type="color"],
select {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 5px 8px;
    color: var(--text-primary);
    font-size: 12px;
    transition: border-color var(--transition);
    width: 100%;
}
input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.15);
}
input[type="color"] {
    width: 32px;
    height: 28px;
    padding: 2px;
    cursor: pointer;
}
input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}
input[type="color"]::-webkit-color-swatch {
    border: 1px solid var(--border);
    border-radius: 3px;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-primary);
    cursor: pointer;
    box-shadow: 0 0 6px var(--accent-glow);
    transition: transform var(--transition);
}
input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}
input[type="range"]:focus::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px var(--accent-glow);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b949e' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 24px;
}

label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.app-layout {
    display: grid;
    grid-template-rows: var(--toolbar-height) 1fr var(--statusbar-height);
    grid-template-columns: var(--panel-width-left) 1fr var(--panel-width-right);
    grid-template-areas:
        "toolbar toolbar toolbar"
        "left-panel canvas right-panel"
        "statusbar statusbar statusbar";
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

.toolbar {
    grid-area: toolbar;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 8px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    overflow-x: auto;
    overflow-y: hidden;
}
.toolbar .separator {
    width: 1px;
    height: 24px;
    background: var(--border);
    margin: 0 4px;
    flex-shrink: 0;
}
.toolbar .spacer {
    flex: 1;
}
.toolbar .app-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent);
    margin-right: 12px;
    flex-shrink: 0;
    letter-spacing: -0.3px;
}

.left-panel {
    grid-area: left-panel;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    z-index: 50;
}
.left-panel .panel-section {
    padding: 8px;
    border-bottom: 1px solid var(--border);
}
.left-panel .panel-section:last-child {
    border-bottom: none;
}
.left-panel .section-title {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 6px;
    padding: 0 4px;
}
.left-panel .tool-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
}

.canvas-area {
    grid-area: canvas;
    position: relative;
    overflow: hidden;
    background: #0a0e14;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: default;
}
.canvas-area.panning {
    cursor: grab;
}
.canvas-area.panning:active {
    cursor: grabbing;
}
.canvas-area.cropping {
    cursor: crosshair;
}
.canvas-container {
    position: relative;
    display: inline-block;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
}
.canvas-container canvas {
    display: block;
    image-rendering: auto;
}
.canvas-container .resize-handle {
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--accent);
    border: 2px solid #fff;
    border-radius: 2px;
    z-index: 20;
    pointer-events: auto;
    box-shadow: 0 0 4px rgba(0,0,0,0.5);
}
.canvas-container .resize-handle.nw { top: -5px; left: -5px; cursor: nw-resize; }
.canvas-container .resize-handle.n  { top: -5px; left: 50%; margin-left: -5px; cursor: n-resize; }
.canvas-container .resize-handle.ne { top: -5px; right: -5px; cursor: ne-resize; }
.canvas-container .resize-handle.e  { top: 50%; margin-top: -5px; right: -5px; cursor: e-resize; }
.canvas-container .resize-handle.se { bottom: -5px; right: -5px; cursor: se-resize; }
.canvas-container .resize-handle.s  { bottom: -5px; left: 50%; margin-left: -5px; cursor: s-resize; }
.canvas-container .resize-handle.sw { bottom: -5px; left: -5px; cursor: sw-resize; }
.canvas-container .resize-handle.w  { top: 50%; margin-top: -5px; left: -5px; cursor: w-resize; }

.crop-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 15;
}
.crop-overlay.active {
    pointer-events: auto;
}
.crop-shade {
    position: absolute;
    background: rgba(0, 0, 0, 0.55);
    pointer-events: none;
}
.crop-box {
    position: absolute;
    border: 2px dashed #fff;
    box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.55);
    cursor: move;
    z-index: 16;
}
.crop-box .crop-handle {
    position: absolute;
    width: 10px;
    height: 10px;
    background: #fff;
    border: 1px solid var(--accent);
    z-index: 17;
}
.crop-box .crop-handle.nw { top: -5px; left: -5px; cursor: nw-resize; }
.crop-box .crop-handle.n  { top: -5px; left: 50%; margin-left: -5px; cursor: n-resize; }
.crop-box .crop-handle.ne { top: -5px; right: -5px; cursor: ne-resize; }
.crop-box .crop-handle.e  { top: 50%; margin-top: -5px; right: -5px; cursor: e-resize; }
.crop-box .crop-handle.se { bottom: -5px; right: -5px; cursor: se-resize; }
.crop-box .crop-handle.s  { bottom: -5px; left: 50%; margin-left: -5px; cursor: s-resize; }
.crop-box .crop-handle.sw { bottom: -5px; left: -5px; cursor: sw-resize; }
.crop-box .crop-handle.w  { top: 50%; margin-top: -5px; left: -5px; cursor: w-resize; }
.crop-dimensions {
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 11px;
    font-family: var(--font-mono);
    white-space: nowrap;
    pointer-events: none;
}

.right-panel {
    grid-area: right-panel;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    overflow-y: auto;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    z-index: 50;
}
.right-panel .panel-section {
    padding: 8px;
    border-bottom: 1px solid var(--border);
}
.right-panel .panel-section:last-child {
    border-bottom: none;
}
.right-panel .section-title {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 6px;
    padding: 0 4px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
}
.right-panel .section-title .collapse-icon {
    font-size: 10px;
    transition: transform var(--transition);
}
.right-panel .section-title.collapsed .collapse-icon {
    transform: rotate(-90deg);
}
.right-panel .section-content {
    overflow: hidden;
    transition: max-height 0.3s ease;
}
.right-panel .section-content.collapsed {
    max-height: 0 !important;
}

.adjustment-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
}
.adjustment-row label {
    min-width: 70px;
    margin-bottom: 0;
    font-size: 11px;
}
.adjustment-row input[type="range"] {
    flex: 1;
}
.adjustment-row input[type="number"] {
    width: 60px;
    text-align: center;
    font-family: var(--font-mono);
}
.adjustment-row button {
    padding: 2px 6px;
    font-size: 10px;
    min-width: auto;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px 8px;
}
.info-grid .info-label {
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}
.info-grid .info-value {
    font-size: 11px;
    font-family: var(--font-mono);
    color: var(--text-primary);
    text-align: right;
}

.statusbar {
    grid-area: statusbar;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 12px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    font-size: 11px;
    color: var(--text-secondary);
    z-index: 100;
    overflow: hidden;
}
.statusbar .status-message {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.statusbar .status-info {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-muted);
    white-space: nowrap;
}

.drop-zone {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.drop-zone.active {
    opacity: 1;
    background: rgba(88, 166, 255, 0.08);
    border: 2px dashed var(--accent);
    pointer-events: auto;
}
.drop-zone-content {
    text-align: center;
    color: var(--accent);
}
.drop-zone-content .drop-icon {
    font-size: 48px;
    display: block;
    margin-bottom: 8px;
}
.drop-zone-content .drop-text {
    font-size: 16px;
    font-weight: 600;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    pointer-events: none;
    user-select: none;
}
.empty-state .empty-icon {
    font-size: 64px;
    display: block;
    margin-bottom: 12px;
    opacity: 0.3;
}
.empty-state .empty-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.empty-state .empty-subtitle {
    font-size: 13px;
    color: var(--text-muted);
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.15s ease;
}
.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    min-width: 400px;
    max-width: 90vw;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.2s ease;
}
.modal h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.modal .form-group {
    margin-bottom: 12px;
}
.modal .form-row {
    display: flex;
    gap: 8px;
    align-items: flex-end;
}
.modal .form-row > * {
    flex: 1;
}
.modal .modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.anchor-grid {
    display: grid;
    grid-template-columns: repeat(3, 32px);
    grid-template-rows: repeat(3, 32px);
    gap: 2px;
}
.anchor-btn {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: 3px;
    font-size: 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
.anchor-btn:hover {
    background: var(--border);
}
.anchor-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.quality-preset-btns {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}
.quality-preset-btns button {
    font-size: 10px;
    padding: 3px 8px;
}

.tab-bar {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}
.tab-btn {
    flex: 1;
    padding: 6px 8px;
    font-size: 11px;
    font-weight: 600;
    text-align: center;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    border-radius: 0;
}
.tab-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}
.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes slideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.statusbar .saving {
    animation: pulse 1s infinite;
    color: var(--warning);
}

@media (max-width: 1100px) {
    .app-layout {
        grid-template-columns: 200px 1fr 260px;
    }
    :root {
        --panel-width-left: 200px;
        --panel-width-right: 260px;
    }
}
@media (max-width: 900px) {
    .app-layout {
        grid-template-columns: 1fr;
        grid-template-rows: var(--toolbar-height) 1fr var(--statusbar-height);
        grid-template-areas:
            "toolbar"
            "canvas"
            "statusbar";
    }
    .left-panel, .right-panel {
        display: none;
    }
    .left-panel.mobile-visible,
    .right-panel.mobile-visible {
        display: flex;
        position: fixed;
        top: var(--toolbar-height);
        bottom: var(--statusbar-height);
        width: 280px;
        z-index: 200;
    }
    .left-panel.mobile-visible {
        left: 0;
    }
    .right-panel.mobile-visible {
        right: 0;
    }
}