:root {
    --bg-dark: #121212;
    --bg-panel: #1e1e1e;
    --accent: #00d4ff;
    --text-main: #e0e0e0;
    --text-muted: #a0a0a0;
    --border: #333;
    --canvas-bg: #000000;
    --modal-bg: #1e1e1e;
    --modal-overlay: rgba(0, 0, 0, 0.5);
    --mode-canvas: #ff9f43;
}

*::-webkit-scrollbar {
    display: none;
}

* {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

body {
    font-family: 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex: 1;
    height: 100%;
    width: 100%;
    position: relative;
}

.animation-section {
    flex: 1;
    background-color: #0a0a0a;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    min-height: 50vh;
    cursor: default;
}

.animation-section.canvas-mode {
    cursor: grab;
}

.animation-section.canvas-mode:active {
    cursor: grabbing;
}

#animContainer {
    flex: 1;
    background-color: #0a0a0a;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    min-height: 100%;
    cursor: default;
    z-index: 45;
}

#playerTime {
    position: absolute;
    bottom: 225px;
    width: 100%;
    font-size: 12px;
    padding-left: 10px;
    display: flex;
    align-items: center;
    justify-content: start;
}

canvas#mainCanvas {
    touch-action: none;
    display: block;
    transform-origin: center center;
    transition: transform 0.1s ease-out;
}

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

.operations-section {
    max-height: 100vh;
    width: 320px;
    background-color: var(--bg-panel);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 10px;
    overflow-y: auto;
    z-index: 10;
}

h2 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.menu-group {
    margin-bottom: 25px;
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    margin-right: 8px;
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.player-btn {
    background: transparent;
    border: 0;
    color: var(--text-main);
    padding: 2px 4px;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    margin-right: 8px;
    font-size: 1.1rem;
}

.player-btn:hover,
.player-btn:active {
    color: var(--accent);
}

.action-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 3px 6px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.icon-btn:hover,
.icon-btn.active,
.action-btn:hover {
    background-color: rgba(0, 212, 255, 0.1);
    border-color: var(--accent);
    color: var(--accent);
}

.icon-btn.mode-active {
    background-color: rgba(255, 159, 67, 0.2);
    border-color: var(--mode-canvas);
    color: var(--mode-canvas);
}

.icon-btn.mode-active:hover {
    background-color: rgba(255, 159, 67, 0.3);
}

.icon-btn:disabled,
.player-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
}

.icon-24 {
    width: 24px;
    height: 24px;
}

.tool-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    display: block;
}

.playback-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.time-display {
    font-family: monospace;
    font-size: .8rem;
    color: var(--accent);
    min-width: 50px;
    text-align: center;
}

.duration-display {
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
    min-width: 50px;
    margin-left: auto;
}

.modal-overlay {
    position: fixed;
    bottom: 0;
    right: 5px;
    width: auto;
    height: auto;
    background: transparent;
    display: none;
    justify-content: center;
    align-items: flex-end;
    z-index: 10;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.open {
    display: block;
    pointer-events: auto;
}

.modal-overlay.open .modal-content {
    display: block;
    transform: translateY(0);
}

.popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.02);
    border-top-left-radius: 4px;
    border-top-right-radius: 4px;
    flex-shrink: 0;
}

.popup-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
}

.close-popup-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
}

.close-popup-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.1);
}

.popup-body {
    padding: 7px 10px;
    max-height: 200px;
    overflow-y: auto;
    flex: 1;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.form-group {
    margin-bottom: 15px;
}

.form-row {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 10px;
}

.form-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.section-title {
    font-size: 0.9rem;
    color: var(--accent);
    margin: 15px 0 10px 0;
    font-weight: 600;
    border-bottom: 1px solid var(--border);
    padding-bottom: 5px;
}

input[type="color"] {
    border: none;
    width: 35px;
    height: 35px;
    cursor: pointer;
    background: none;
    overflow: hidden;
    padding: 0;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border);
    color: white;
    border-radius: 6px;
    font-family: inherit;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
}

.btn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 15px;
}

.btn-danger {
    background: rgba(255, 50, 50, 0.1);
    border-color: rgba(255, 50, 50, 0.3);
    color: #ff6b6b;
}

.btn-danger:hover {
    background: rgba(255, 50, 50, 0.2);
    border-color: #ff6b6b;
}

.btn-primary {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--accent);
    color: var(--accent);
}

.btn-primary:hover {
    background: rgba(0, 212, 255, 0.2);
}

.shape-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.shape-option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 3px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.shape-option:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--accent);
}

.shape-option i {
    font-size: 1.5rem;
    color: var(--text-main);
}

.shape-option span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.rn-slider-wrapper {
    display: flex;
    justify-content: center;
    margin: 5px 0;
}

#toastContainer {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    pointer-events: none;
}

.toast {
    background: #222;
    color: #fff;
    padding: 10px 18px;
    border-radius: 6px;
    margin-top: 8px;
    font-size: 13px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.25s ease;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .animation-section {
        flex: none;
        height: 60vh;
        width: 100%;
        border-bottom: 1px solid var(--border);
    }

    .operations-section {
        width: 100%;
        height: 40vh;
        border-left: none;
        border-top: 1px solid var(--border);
    }

    .modal-content {
        height: auto;
    }
}

.modal-header-drag-handle {
    cursor: grab;
    touch-action: none;
    user-select: none;
}

.modal-header-drag-handle:active {
    cursor: grabbing;
}

.modal-content.is-dragging {
    position: fixed !important;
    margin: 0 !important;
    bottom: auto !important;
    right: auto !important;
    transition: none !important;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6) !important;
}

@media (min-width: 768px) {
    .modal-content {
        border-radius: 4px;
        border-bottom: 1px solid var(--border);
        background: var(--modal-bg);
        transform: translateY(20px);
        margin-bottom: 20px;
        min-width: 300px;
    }
}

@media (max-width: 768px) {
    .modal-content {
        position: fixed;
        overflow-y: auto;
        background: var(--modal-bg);
        bottom: 0;
        left: 0;
        border-bottom: none;
        border-radius: 4px 4px 0 0;
        min-width: 300px;
    }

}

.pivot-handle {
    fill: var(--mode-canvas);
    stroke: #ffffff;
    stroke-width: 2;
    cursor: move;
    touch-action: none;
    pointer-events: all;
}

.pivot-handle:hover {
    fill: #ffcc80;
    stroke: #ffffff;
    stroke-width: 3;
}

.pivot-handle:active {
    fill: #ff9f43;
}

#btnResetPivot {
    background: rgba(255, 159, 67, 0.1);
    border-color: var(--mode-canvas);
    color: var(--mode-canvas);
}

#btnResetPivot:hover {
    background: rgba(255, 159, 67, 0.2);
}

#animContainer {
    position: relative;
    overflow: hidden;
}

#mainCanvas {
    position: absolute;
    top: 0;
    left: 0;
}

#timelineContainer {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 220px;
    background: #111;
    border-top: 1px solid #333;

    display: grid;
    grid-template-columns: 200px 1fr;
    grid-template-rows: 40px 1fr;

    overflow: auto;
    z-index: 49;
}

#trackHeader {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-left: 10px;
    background: #1a1a1a;
    border-right: 1px solid #333;
    border-bottom: 1px solid #333;
    font-size: 12px;
    z-index: 49;
}

#timelineRuler {
    position: relative;
    overflow: auto;
    will-change: transform;
    grid-column: 2;
    grid-row: 1;
    background: #0d0d0d;
    border-bottom: 1px solid #333;
    z-index: 48;
}

#trackLabels {
    grid-column: 1;
    grid-row: 2;
    overflow: hidden;
    background: #1a1a1a;
    border-right: 1px solid #333;
    z-index: 48;
}

#timelineTracksWrapper {
    width: 100%;
    grid-column: 2;
    grid-row: 2;
    overflow: auto;
    position: relative;
    z-index: 47;
    touch-action: none;
}

#timelineTracks {
    position: relative;
    z-index: 47;
}

.track-label {
    height: 36px;
    display: flex;
    align-items: center;
    padding-left: 10px;
    border-bottom: 1px solid #222;
    font-size: 12px;
    color: #ccc;
}

.track-row {
    height: 36px;
    border-bottom: 1px solid #222;
    position: relative;
}

.keyframe {
    position: absolute;
    top: 50%;
    width: 12px;
    height: 12px;
    background: #00ff00;
    transform: translate(-50%, -50%) rotate(45deg);
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.15s ease;
}

.keyframe:hover {
    background: #ffd166;
    transform: translate(-50%, -50%) rotate(45deg) scale(1.15);
    box-shadow: 0 0 6px rgba(255, 209, 102, 0.7);
}

.keyframe.active {
    background: #ff9f43;
    border: 2px solid #ffffff;
    transform: translate(-50%, -50%) rotate(45deg) scale(1.25);
    box-shadow: 0 0 8px rgba(255, 159, 67, 0.8);
}

.keyframe-item.active {
    background: rgba(0, 212, 255, 0.15);
    border: 1px solid #00d4ff;
}

#timelinePlayhead {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 1px;
    background: red;
    pointer-events: none;
    z-index: 100;
}

.track-label.active {
    background: #00d4ff22;
    color: #00d4ff;
}

.track-row.active {
    background: #00d4ff10;
}

#timelineResizeHandle {
    position: absolute;
    top: 1px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 8px;
    background: rgb(68, 68, 68, .5);
    border-radius: 4px;
    cursor: ns-resize;
    z-index: 49;
    transition: background 0.2s;
}

#timelineResizeHandle:hover {
    background: #00d4ff;
}

#btnPencil.mode-active {
    background-color: rgba(0, 212, 255, 0.2);
    border-color: var(--accent);
    color: var(--accent);
}

#btnPencil.mode-active:hover {
    background-color: rgba(0, 212, 255, 0.3);
}

.animation-section.pencil-mode {
    cursor: crosshair;
}

.pencil-preview {
    stroke: var(--accent);
    stroke-width: 2;
    fill: none;
    pointer-events: none;
}

#btnPencil.mode-active,
#btnBrush.mode-active,
#btnEraser.mode-active {
    background-color: rgba(0, 212, 255, 0.2);
    border-color: var(--accent);
    color: var(--accent);
}

select {
    width: 100%;
    padding: 10px 12px;
    background: rgba(20, 20, 30, 0.9);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: 'Segoe UI', Roboto, sans-serif;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2300d4ff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'></polyline></svg>");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 14px;
}

select:hover {
    border-color: var(--accent);
    background: rgba(30, 30, 45, 0.95);
}

select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

select option {
    background: #1e1e2e;
    color: var(--text-main);
    padding: 10px;
    font-size: 0.85rem;
}

select option:hover {
    background: var(--accent);
    color: #000;
}

select option:checked {
    background: var(--accent);
    color: #000;
}

select::-ms-expand {
    display: none;
}

.form-label {
    display: block;
    font-size: 0.75rem;
    color: var(--accent);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.select-wrapper {
    position: relative;
    width: 100%;
}

.select-wrapper::after {
    content: '▼';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent);
    font-size: 10px;
    pointer-events: none;
}

#easingSelect {
    background: linear-gradient(135deg, rgba(20, 20, 30, 0.95) 0%, rgba(30, 30, 45, 0.95) 100%);
    font-weight: 500;
}

#easingSelect option {
    font-weight: normal;
}

select optgroup {
    background: #1a1a2a;
    color: var(--accent);
    font-weight: bold;
    font-style: normal;
    padding: 5px;
}

.progress-bar-container {
    background: #333;
    border-radius: 10px;
    height: 20px;
    margin: 10px 0;
    overflow: hidden;
}

#exportProgressBar {
    width: 0%;
    background: var(--accent);
    border-radius: 10px;
    height: 100%;
    transition: width 0.3s ease;
}

#exportProgressText {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

#exportModal .modal-content {
    max-width: 450px;
}

#confirmDialog .modal-content {
    max-width: 400px;
    z-index: 100;
}

#confirmDialog .popup-body p {
    color: var(--text-main);
    line-height: 1.5;
}

#confirmDialog .btn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 10px;
}

.help-section {
    margin-bottom: 25px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 15px;
}

.help-section h3 {
    color: var(--accent);
    margin-bottom: 12px;
    font-size: 1.1rem;
}

.help-section h4 {
    color: var(--text-main);
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.help-section ul,
.help-section ol {
    margin-left: 20px;
    color: var(--text-muted);
    line-height: 1.6;
}

.help-section li {
    margin-bottom: 5px;
}

.help-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.help-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 6px;
}

.help-icon {
    font-size: 1.2rem;
    min-width: 30px;
    text-align: center;
}

.help-tip {
    background: rgba(0, 212, 255, 0.1);
    border-left: 3px solid var(--accent);
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
    font-size: 0.85rem;
}

kbd {
    background: #2d2d2d;
    border-radius: 4px;
    padding: 2px 6px;
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--accent);
    border: 1px solid #555;
}

.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 15px;
}

.shortcut-category {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    padding: 12px;
}

.shortcut-category h4 {
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border);
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

#helpModal {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    justify-content: center;
    align-items: center;
    z-index: 1400;
}

#helpModal .popup-body::-webkit-scrollbar {
    width: 8px;
}

#helpModal .popup-body::-webkit-scrollbar-track {
    background: var(--bg-dark);
    border-radius: 4px;
}

#helpModal .popup-body::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

#helpModal .popup-body::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

#btnSelectionTool.mode-active {
    background-color: rgba(0, 212, 255, 0.2);
    border-color: var(--accent);
    color: var(--accent);
}