/* ============================================================================
   css/editors/sprite-sheet-editor.css
   SM Engine - 2D Sprite Sheet & Animation Studio (Windows 11 / Unreal Style)
   ============================================================================ */

.sm-sse-modal {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    display: none;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    padding: 24px;
}

.sm-sse-modal.active {
    display: flex;
}

.sm-sse-window {
    width: 100%;
    height: 100%;
    max-width: 1600px;
    max-height: 940px;
    background: #0f131a;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 12px;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.8), 0 0 1px rgba(255, 255, 255, 0.2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: #e2e8f0;
}

/* Top Bar */
.sm-sse-topbar {
    height: 48px;
    background: #0b0e14;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    flex-shrink: 0;
}

.sm-sse-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.02em;
    color: #f59e0b;
}

.sm-sse-topbar-tools {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sm-sse-divider {
    width: 1px;
    height: 20px;
    background: rgba(255, 255, 255, 0.12);
    margin: 0 4px;
}

.sm-sse-btn {
    height: 30px;
    padding: 0 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 6px;
    color: #cbd5e1;
    font-size: 11.5px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s ease;
}

.sm-sse-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.25);
}

.sm-sse-btn-primary {
    background: linear-gradient(180deg, #f59e0b 0%, #d97706 100%);
    border-color: #f59e0b;
    color: #000;
    font-weight: 750;
}

.sm-sse-btn-primary:hover {
    background: linear-gradient(180deg, #fbbf24 0%, #f59e0b 100%);
    color: #000;
}

.sm-sse-btn-accent {
    background: #0284c7;
    border-color: #38bdf8;
    color: #fff;
}

.sm-sse-close {
    background: transparent;
    border: none;
    color: #94a3b8;
    font-size: 16px;
    cursor: pointer;
    padding: 6px;
}

.sm-sse-close:hover {
    color: #ef4444;
}

/* Workspace 3-Column Body */
.sm-sse-body {
    flex: 1;
    display: grid;
    grid-template-columns: 260px 1fr 320px;
    overflow: hidden;
}

/* Left & Right Sidebars */
.sm-sse-sidebar-left,
.sm-sse-sidebar-right {
    background: #111622;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sm-sse-sidebar-left {
    border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.sm-sse-sidebar-right {
    border-left: 1px solid rgba(255, 255, 255, 0.08);
}

.sm-sse-panel-header {
    height: 36px;
    padding: 0 12px;
    background: #151c2c;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 11px;
    font-weight: 750;
    color: #94a3b8;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Tool Selector Bar */
.sm-sse-tool-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    padding: 8px;
    gap: 4px;
    background: #0b0e14;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sm-sse-tool-btn {
    height: 32px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 4px;
    color: #94a3b8;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.sm-sse-tool-btn:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
}

.sm-sse-tool-btn.active {
    background: rgba(245, 158, 11, 0.15);
    border-color: rgba(245, 158, 11, 0.4);
    color: #f59e0b;
}

/* Slice Inspector */
.sm-sse-slice-inspector {
    padding: 12px;
    background: #0f1420;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sm-sse-prop-title {
    font-size: 9.5px;
    font-weight: 800;
    color: #64748b;
    margin-bottom: 6px;
    letter-spacing: 0.06em;
}

.sm-sse-form-row {
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin-bottom: 6px;
}

.sm-sse-form-row label,
.sm-sse-form-grid-2 label {
    font-size: 10px;
    color: #94a3b8;
}

.sm-sse-input {
    height: 24px;
    background: #06090e;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    padding: 0 6px;
    color: #fff;
    font-size: 11px;
    width: 100%;
    box-sizing: border-box;
}

.sm-sse-form-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.sm-sse-pivot-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3px;
    margin-top: 4px;
}

.sm-sse-pivot-grid button {
    height: 22px;
    background: #182030;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 3px;
    color: #94a3b8;
    font-size: 9.5px;
    font-weight: 700;
    cursor: pointer;
}

.sm-sse-pivot-grid button:hover {
    background: #f59e0b;
    color: #000;
}

/* Slices Scrollable List */
.sm-sse-slice-list {
    flex: 1;
    overflow-y: auto;
    padding: 6px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sm-sse-slice-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    border-radius: 4px;
    border: 1px solid transparent;
    cursor: pointer;
    font-size: 11.5px;
    color: #cbd5e1;
}

.sm-sse-slice-item:hover {
    background: rgba(255, 255, 255, 0.04);
}

.sm-sse-slice-item.active {
    background: rgba(56, 189, 248, 0.12);
    border-color: rgba(56, 189, 248, 0.4);
    color: #38bdf8;
    font-weight: 600;
}

.sm-sse-slice-idx {
    font-size: 10px;
    color: #64748b;
    width: 16px;
}

.sm-sse-slice-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sm-sse-slice-res {
    font-size: 9.5px;
    color: #64748b;
    font-family: monospace;
}

.sm-sse-delete-slice {
    background: transparent;
    border: none;
    color: #64748b;
    cursor: pointer;
    padding: 2px;
}

.sm-sse-delete-slice:hover {
    color: #ef4444;
}

/* Center Canvas Viewport */
.sm-sse-viewport-wrap {
    position: relative;
    flex: 1;
    overflow: hidden;
    cursor: crosshair;
    background: #111622;
}

.sm-sse-canvas-hud {
    position: absolute;
    bottom: 12px;
    left: 12px;
    background: rgba(11, 14, 20, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    border-radius: 4px;
    padding: 4px 10px;
    display: flex;
    gap: 12px;
    font-size: 11px;
    color: #94a3b8;
    pointer-events: none;
}

/* Right Panel: Preview & Clips */
.sm-sse-preview-box {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sm-sse-preview-canvas-wrap {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0b0e14;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.sm-sse-preview-controls {
    display: flex;
    gap: 4px;
}

.sm-sse-preview-controls button,
.sm-sse-mini-btn {
    width: 24px;
    height: 24px;
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    color: #cbd5e1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
}

.sm-sse-mini-btn {
    width: auto;
    padding: 0 8px;
    gap: 4px;
}

.sm-sse-preview-footer {
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sm-sse-slider-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 11px;
}

.sm-sse-slider-row input[type="range"] {
    accent-color: #f59e0b;
}

.sm-sse-toggle-row {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: #94a3b8;
}

.sm-sse-clips-manager {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sm-sse-clips-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sm-sse-clip-card {
    background: #182030;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 6px;
    padding: 8px 10px;
    cursor: pointer;
}

.sm-sse-clip-card.active {
    border-color: #f59e0b;
    background: rgba(245, 158, 11, 0.12);
}

.sm-sse-clip-head {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    margin-bottom: 4px;
}

.sm-sse-clip-body {
    display: flex;
    gap: 12px;
    font-size: 10.5px;
    color: #94a3b8;
}

.sm-sse-empty-hint {
    padding: 20px;
    text-align: center;
    color: #64748b;
    font-size: 11px;
    font-style: italic;
}

/* Grid Dialog */
.sm-sse-dialog-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.sm-sse-dialog {
    width: 320px;
    background: #111622;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.7);
}

.sm-sse-dialog h3 {
    margin: 0 0 12px;
    font-size: 13px;
    color: #f8fafc;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sm-sse-dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 14px;
}

/* Asset-aware production workflow ------------------------------------------------ */
.sm-sse-brand > div {
    display: grid;
    gap: 1px;
}

.sm-sse-asset-context {
    color: #7f91aa;
    font-size: 9px;
    font-weight: 600;
    letter-spacing: .02em;
    max-width: 340px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sm-sse-source-warning {
    max-width: 560px;
    overflow: hidden;
    color: #ffbd5d;
    font-size: 9px;
    font-weight: 700;
    line-height: 1.25;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sm-sse-btn-save {
    background: #173b31;
    border-color: #2f8067;
    color: #c5f4df;
}

.sm-sse-btn-save:hover,
.sm-sse-btn-save.is-dirty {
    background: #1f5b49;
    border-color: #5fe0ae;
    color: #fff;
}

.sm-sse-btn-save:disabled {
    cursor: not-allowed;
    opacity: .45;
}

.sm-sse-timeline {
    flex: 0 0 92px;
    min-height: 92px;
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    background: #0a0f19;
    border-top: 1px solid rgba(148, 163, 184, .16);
    overflow: hidden;
}

.sm-sse-timeline-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    color: #788aa5;
    background: #0d1421;
    border-right: 1px solid rgba(148, 163, 184, .12);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: .06em;
}

.sm-sse-frame-strip {
    display: flex;
    align-items: center;
    gap: 7px;
    min-width: 0;
    overflow-x: auto;
    padding: 9px 12px;
    scrollbar-color: #34435c transparent;
}

.sm-sse-timeline-empty {
    color: #60708a;
    font-size: 11px;
    font-style: italic;
}

.sm-sse-frame-chip {
    flex: 0 0 56px;
    height: 68px;
    display: grid;
    grid-template-rows: 48px 16px;
    gap: 2px;
    padding: 2px;
    color: #8999b2;
    background: #121b2a;
    border: 1px solid rgba(148, 163, 184, .18);
    border-radius: 5px;
    cursor: pointer;
    font: 700 9px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
}

.sm-sse-frame-chip:hover {
    border-color: #f0ad3d;
    color: #fff;
}

.sm-sse-frame-chip.active {
    background: #163a52;
    border-color: #38bdf8;
    box-shadow: 0 0 0 1px rgba(56, 189, 248, .24);
    color: #d9f5ff;
}

.sm-sse-frame-thumb {
    display: block;
    width: 100%;
    height: 48px;
    background-color: #1b2638;
    background-repeat: no-repeat;
    image-rendering: pixelated;
}

@media (max-width: 980px) {
    .sm-sse-modal { padding: 10px; }
    .sm-sse-window { max-height: none; }
    .sm-sse-body { grid-template-columns: 210px 1fr 250px; }
    .sm-sse-topbar-tools .sm-sse-btn { padding: 0 7px; }
    .sm-sse-topbar-tools .sm-sse-btn:not(.sm-sse-btn-save) { font-size: 0; }
    .sm-sse-topbar-tools .sm-sse-btn i { font-size: 12px; }
}