:root {
    --app-bg: #f6f8fb;
    --app-surface: rgba(255, 255, 255, 0.82);
    --app-surface-strong: rgba(255, 255, 255, 0.96);
    --app-text: #171717;
    --app-muted: #6b7280;
    --app-border: rgba(23, 23, 23, 0.1);
    --app-primary: #0077ff;
    --app-primary-strong: #005ec7;
    --app-accent: #12b981;
    --app-danger: #dc2626;
    --app-shadow: 0 18px 42px rgba(35, 45, 60, 0.14);
    --sidebar-width: 236px;
    --panel-width: 360px;
}

[data-bs-theme="dark"] {
    --app-bg: #121212;
    --app-surface: rgba(30, 30, 30, 0.78);
    --app-surface-strong: rgba(32, 32, 32, 0.96);
    --app-text: #f5f5f5;
    --app-muted: #a3a3a3;
    --app-border: rgba(255, 255, 255, 0.12);
    --app-primary: #4da1ff;
    --app-primary-strong: #75b7ff;
    --app-shadow: 0 18px 42px rgba(0, 0, 0, 0.34);
}

* {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    margin: 0;
    background:
        radial-gradient(circle at 12% 10%, rgba(18, 185, 129, 0.12), transparent 32rem),
        radial-gradient(circle at 92% 12%, rgba(0, 119, 255, 0.13), transparent 34rem),
        var(--app-bg);
    color: var(--app-text);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    overflow-x: hidden;
}

button,
input,
select,
textarea {
    font: inherit;
}

.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    min-height: 100vh;
}

.glass-panel {
    border: 1px solid var(--app-border);
    background: var(--app-surface);
    box-shadow: var(--app-shadow);
    backdrop-filter: blur(18px);
}

.app-sidebar {
    position: sticky;
    top: 0;
    z-index: 30;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    height: 100vh;
    padding: 1rem;
    border-right: 1px solid var(--app-border);
    background: var(--app-surface-strong);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.45rem;
}

.brand-mark {
    display: grid;
    width: 42px;
    height: 42px;
    place-items: center;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--app-primary), var(--app-accent));
    color: #fff;
    font-size: 1.35rem;
}

.sidebar-brand strong,
.sidebar-brand span {
    display: block;
}

.sidebar-brand span {
    color: var(--app-muted);
    font-size: 0.78rem;
}

.sidebar-nav {
    display: grid;
    gap: 0.35rem;
}

.nav-tool {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.72rem 0.75rem;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: var(--app-muted);
    text-align: left;
    transition: background 180ms ease, color 180ms ease, transform 180ms ease;
}

.nav-tool:hover,
.nav-tool.active {
    background: rgba(0, 119, 255, 0.12);
    color: var(--app-primary-strong);
    transform: translateX(2px);
}

.sidebar-footer {
    margin-top: auto;
    color: var(--app-muted);
    font-size: 0.76rem;
}

.app-main {
    display: flex;
    flex-direction: column;
    min-width: 0;
    padding: 1rem;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 76px;
    padding: 0.9rem 1rem;
    border-radius: 8px;
}

.topbar h1 {
    margin: 0;
    font-size: clamp(1rem, 2vw, 1.35rem);
    font-weight: 800;
}

.topbar p {
    margin: 0.15rem 0 0;
    color: var(--app-muted);
    font-size: 0.88rem;
}

.topbar-actions,
.toolbar-row,
.stage-toolbar,
.zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.btn-primary {
    --bs-btn-bg: var(--app-primary);
    --bs-btn-border-color: var(--app-primary);
    --bs-btn-hover-bg: var(--app-primary-strong);
    --bs-btn-hover-border-color: var(--app-primary-strong);
    border-radius: 8px;
}

.btn-soft,
.btn-icon {
    border: 1px solid var(--app-border);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.68);
    color: var(--app-text);
}

[data-bs-theme="dark"] .btn-soft,
[data-bs-theme="dark"] .btn-icon {
    background: rgba(255, 255, 255, 0.08);
}

.btn-soft:hover,
.btn-icon:hover {
    border-color: rgba(0, 119, 255, 0.32);
    color: var(--app-primary-strong);
}

.workspace-grid {
    display: grid;
    grid-template-columns: minmax(290px, var(--panel-width)) minmax(0, 1fr);
    gap: 1rem;
    min-height: calc(100vh - 108px);
    margin-top: 1rem;
}

.tool-panels,
.stage-column {
    border-radius: 8px;
}

.tool-panels {
    max-height: calc(100vh - 108px);
    overflow: auto;
    padding: 1rem;
}

.panel-section {
    display: none;
    animation: panelIn 180ms ease;
}

.panel-section.active {
    display: block;
}

@keyframes panelIn {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-title {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.85rem;
}

.section-title.compact {
    margin-top: 1.1rem;
    margin-bottom: 0.5rem;
}

.section-title span {
    font-weight: 800;
}

.section-title small,
.upload-zone span,
.upload-meta {
    color: var(--app-muted);
}

.upload-zone {
    display: grid;
    gap: 0.5rem;
    place-items: center;
    min-height: 212px;
    padding: 1rem;
    border: 1.5px dashed rgba(0, 119, 255, 0.42);
    border-radius: 8px;
    background: rgba(0, 119, 255, 0.07);
    text-align: center;
    transition: border 180ms ease, background 180ms ease, transform 180ms ease;
}

.upload-zone.drag-over {
    border-color: var(--app-accent);
    background: rgba(18, 185, 129, 0.12);
    transform: scale(1.01);
}

.upload-zone i {
    color: var(--app-primary);
    font-size: 2.5rem;
}

.upload-meta {
    display: grid;
    gap: 0.45rem;
    margin-top: 0.8rem;
    font-size: 0.84rem;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
    margin-bottom: 0.85rem;
}

.control-stack {
    display: grid;
    gap: 0.55rem;
    margin: 0.75rem 0;
}

.control-stack label {
    display: grid;
    gap: 0.2rem;
    color: var(--app-muted);
    font-size: 0.84rem;
}

.form-control,
.form-select {
    border-color: var(--app-border);
    border-radius: 8px;
}

.form-range::-webkit-slider-thumb {
    background: var(--app-primary);
}

.page-list,
.layer-list {
    display: grid;
    gap: 0.55rem;
    max-height: 47vh;
    margin-top: 0.85rem;
    overflow: auto;
}

.page-card,
.layer-card {
    display: grid;
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 0.65rem;
    align-items: center;
    padding: 0.55rem;
    border: 1px solid var(--app-border);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.58);
    cursor: pointer;
}

[data-bs-theme="dark"] .page-card,
[data-bs-theme="dark"] .layer-card {
    background: rgba(255, 255, 255, 0.06);
}

.page-card.active,
.layer-card.active {
    border-color: var(--app-primary);
    box-shadow: 0 0 0 3px rgba(0, 119, 255, 0.14);
}

.page-card img {
    width: 76px;
    height: 96px;
    object-fit: contain;
    border-radius: 6px;
    background: #fff;
}

.page-card strong,
.layer-card strong {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.9rem;
}

.page-card small,
.layer-card small {
    color: var(--app-muted);
}

.segmented {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.35rem;
    margin-bottom: 0.85rem;
    padding: 0.25rem;
    border: 1px solid var(--app-border);
    border-radius: 8px;
}

.segmented button {
    border: 0;
    border-radius: 6px;
    padding: 0.55rem;
    background: transparent;
    color: var(--app-muted);
}

.segmented button.active {
    background: var(--app-primary);
    color: #fff;
}

.stage-column {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    min-width: 0;
    overflow: hidden;
}

.stage-toolbar {
    justify-content: space-between;
    padding: 0.75rem;
    border-bottom: 1px solid var(--app-border);
}

.status-pill {
    max-width: min(48vw, 420px);
    overflow: hidden;
    border: 1px solid var(--app-border);
    border-radius: 999px;
    padding: 0.35rem 0.75rem;
    color: var(--app-muted);
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.82rem;
}

.canvas-wrap {
    position: relative;
    display: grid;
    min-height: 420px;
    overflow: auto;
    place-items: center;
    padding: 2rem;
    background-image:
        linear-gradient(45deg, rgba(0, 0, 0, 0.035) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(0, 0, 0, 0.035) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(0, 0, 0, 0.035) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(0, 0, 0, 0.035) 75%);
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    background-size: 20px 20px;
}

#editorCanvas {
    display: block;
    width: min(100%, 780px);
    height: auto;
    border-radius: 2px;
    background: #fff;
    box-shadow: 0 22px 52px rgba(0, 0, 0, 0.24);
    touch-action: none;
}

.toast {
    border: 1px solid var(--app-border);
    border-radius: 8px;
    background: var(--app-surface-strong);
    color: var(--app-text);
    backdrop-filter: blur(14px);
}

.toast.toast-danger {
    border-color: rgba(220, 38, 38, 0.45);
}

.toast.toast-warning {
    border-color: rgba(245, 158, 11, 0.45);
}

.sortable-ghost {
    opacity: 0.45;
}

@media (max-width: 1180px) {
    .app-shell {
        grid-template-columns: 78px minmax(0, 1fr);
    }

    .app-sidebar {
        align-items: center;
        padding: 0.75rem;
    }

    .sidebar-brand div:not(.brand-mark),
    .nav-tool span,
    .sidebar-footer {
        display: none;
    }

    .nav-tool {
        justify-content: center;
    }
}

@media (max-width: 991.98px) {
    .app-shell {
        display: block;
    }

    .app-sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        width: min(82vw, 300px);
        transform: translateX(-105%);
        transition: transform 220ms ease;
    }

    .app-sidebar.open {
        transform: translateX(0);
    }

    .sidebar-brand div:not(.brand-mark),
    .nav-tool span,
    .sidebar-footer {
        display: block;
    }

    .nav-tool {
        justify-content: flex-start;
    }

    .workspace-grid {
        grid-template-columns: 1fr;
    }

    .tool-panels {
        max-height: none;
    }
}

@media (max-width: 640px) {
    .app-main {
        padding: 0.65rem;
    }

    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .topbar-actions {
        width: 100%;
    }

    .topbar-actions .btn-primary {
        flex: 1 1 140px;
    }

    .canvas-wrap {
        min-height: 360px;
        padding: 1rem;
    }

    .tool-grid {
        grid-template-columns: 1fr;
    }
}

@media print {
    body {
        background: #fff;
    }

    .app-sidebar,
    .topbar,
    .tool-panels,
    .stage-toolbar,
    .toast-container {
        display: none !important;
    }

    .app-shell,
    .app-main,
    .workspace-grid,
    .stage-column,
    .canvas-wrap {
        display: block;
        min-height: auto;
        margin: 0;
        padding: 0;
        box-shadow: none;
        border: 0;
        background: #fff;
    }

    #editorCanvas {
        width: 100vw !important;
        box-shadow: none;
    }
}