/* ============================================================
   Cross-Section Studio — app styles
   Prefix: xs-  |  Theme vars follow site palette (main.css)
   ============================================================ */

:root {
    --xs-primary: #18a9a8;
    --xs-primary-hover: #14908f;
    --xs-primary-glow: rgba(24, 169, 168, 0.3);
    --xs-accent: #6366f1;
    --xs-danger: #ef4444;
    --xs-mono: ui-monospace, 'Cascadia Code', Consolas, 'Courier New', monospace;
}

[data-theme="light"] {
    --xs-bg: #ffffff;
    --xs-bg-alt: #f8fafc;
    --xs-bg-panel: #f1f5f9;
    --xs-bg-inset: #e8edf3;
    --xs-text: #1e293b;
    --xs-text-secondary: #64748b;
    --xs-text-muted: #94a3b8;
    --xs-border: #e2e8f0;
    --xs-border-strong: #cbd5e1;
    --xs-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

[data-theme="dark"] {
    --xs-primary: #22d3d1;
    --xs-primary-hover: #18a9a8;
    --xs-bg: #111827;
    --xs-bg-alt: #0f172a;
    --xs-bg-panel: #1e293b;
    --xs-bg-inset: #162132;
    --xs-text: #f1f5f9;
    --xs-text-secondary: #cbd5e1;
    --xs-text-muted: #94a3b8;
    --xs-border: #334155;
    --xs-border-strong: #475569;
    --xs-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
}

/* ==================== APP SHELL ==================== */
.xs-app {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 1rem 2rem;
}

.xs-app .app-header { padding: 1.25rem 0 0.75rem; }

.xs-app .header-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.xs-app .back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 1rem;
    border: 1px solid var(--xs-border);
    border-radius: 8px;
    background: var(--xs-bg-panel);
    color: var(--xs-text-secondary);
    font-size: 0.85rem;
    text-decoration: none;
    border-bottom: 1px solid var(--xs-border);
    transition: all 0.25s ease;
}

.xs-app .back-btn:hover {
    color: var(--xs-primary);
    border-color: var(--xs-primary);
    transform: translateX(-3px);
}

.xs-app .header-badges { display: flex; gap: 0.5rem; }

.xs-app .header-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.8rem;
    border: 1px solid var(--xs-border);
    border-radius: 999px;
    background: var(--xs-bg-panel);
    color: var(--xs-text-secondary);
    font-size: 0.75rem;
}

.xs-app .header-badge i { color: var(--xs-primary); }

.xs-app .header-content h1 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0 0 0.15rem;
    font-size: 2rem;
    letter-spacing: 0.02em;
    color: var(--xs-text);
}

.xs-app .header-content h1 .xs-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--xs-primary), var(--xs-accent));
    color: #fff;
    font-size: 1.3rem;
    box-shadow: 0 4px 14px var(--xs-primary-glow);
}

.xs-app .header-content h1 .highlight { color: var(--xs-primary); }

.xs-app .header-content > p {
    margin: 0;
    color: var(--xs-text-secondary);
    font-size: 1rem;
}

/* ==================== STUDIO GRID ==================== */
.xs-studio {
    display: grid;
    grid-template-columns: 268px minmax(0, 1fr) 292px;
    grid-template-rows: auto minmax(420px, 62vh) auto;
    grid-template-areas:
        "toolbar toolbar toolbar"
        "left    viewport right"
        "layers  layers   layers";
    gap: 0.75rem;
    margin-top: 1rem;
}

/* ==================== TOOLBAR ==================== */
.xs-toolbar {
    grid-area: toolbar;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.55rem 0.75rem;
    background: var(--xs-bg-panel);
    border: 1px solid var(--xs-border);
    border-radius: 12px;
    box-shadow: var(--xs-shadow);
}

.xs-toolbar .xs-tool-sep {
    width: 1px;
    height: 22px;
    background: var(--xs-border-strong);
    margin: 0 0.25rem;
}

.xs-toolbar .xs-spacer { flex: 1; }

/* NOTE: main.css ships aggressive global button rules
   (`[data-theme="dark"] button { background: accent }`, `color:#fff !important`)
   — every selector here is scoped under .xs-app and colors carry !important
   where needed to win that cascade. */
.xs-app .xs-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.42rem 0.85rem;
    border: 1px solid var(--xs-border);
    border-radius: 8px;
    background: var(--xs-bg);
    color: var(--xs-text-secondary) !important;
    font-size: 0.82rem;
    font-weight: 400;
    font-family: inherit;
    line-height: 1.2;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    letter-spacing: 0;
    height: auto;
    box-shadow: none;
}

.xs-app .xs-btn:hover:not(:disabled) {
    background: var(--xs-bg);
    color: var(--xs-primary) !important;
    border-color: var(--xs-primary);
    box-shadow: 0 0 0 3px var(--xs-primary-glow);
    transform: none;
}

.xs-app .xs-btn:active { background: var(--xs-bg-inset); }

.xs-app .xs-btn:disabled { opacity: 0.45; cursor: not-allowed; }

.xs-app .xs-btn.xs-btn--primary {
    background: linear-gradient(135deg, var(--xs-primary), var(--xs-primary-hover));
    border-color: transparent;
    color: #fff !important;
    font-weight: 600;
}

.xs-app .xs-btn.xs-btn--primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--xs-primary), var(--xs-primary-hover));
    color: #fff !important;
    box-shadow: 0 4px 14px var(--xs-primary-glow);
    transform: translateY(-1px);
}

.xs-app .xs-btn.xs-btn--danger:hover:not(:disabled) {
    color: var(--xs-danger) !important;
    border-color: var(--xs-danger);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

/* ==================== PANELS ==================== */
.xs-panel {
    background: var(--xs-bg-panel);
    border: 1px solid var(--xs-border);
    border-radius: 12px;
    box-shadow: var(--xs-shadow);
    overflow-y: auto;
    overflow-x: hidden;
}

.xs-left  { grid-area: left; }
.xs-right { grid-area: right; }

.xs-panel details {
    border-bottom: 1px solid var(--xs-border);
    margin: 0;
}

.xs-panel details:last-child { border-bottom: none; }

.xs-panel summary {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.7rem 0.9rem;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--xs-text-secondary);
    cursor: pointer;
    user-select: none;
    list-style: none;
}

.xs-panel summary::-webkit-details-marker { display: none; }

.xs-panel summary i:first-child {
    color: var(--xs-primary);
    width: 16px;
    text-align: center;
}

.xs-panel summary::after {
    content: '\2039';
    margin-left: auto;
    font-size: 1.1rem;
    color: var(--xs-text-muted);
    transform: rotate(-90deg);
    transition: transform 0.2s ease;
}

.xs-panel details[open] summary::after { transform: rotate(90deg); }

.xs-panel .xs-group { padding: 0.15rem 0.9rem 0.9rem; }

/* ==================== FIELDS ==================== */
.xs-field {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem;
    margin: 0.45rem 0;
}

.xs-field > label {
    flex: 1;
    font-size: 0.8rem;
    color: var(--xs-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.xs-field .xs-unit {
    font-size: 0.68rem;
    color: var(--xs-text-muted);
    font-family: var(--xs-mono);
}

.xs-app input[type="number"].xs-num {
    width: 82px;
    padding: 0.32rem 0.45rem;
    border: 1px solid var(--xs-border-strong);
    border-radius: 6px;
    background: var(--xs-bg);
    color: var(--xs-text);
    font-family: var(--xs-mono);
    font-size: 0.82rem;
    text-align: right;
    height: auto;
}

.xs-app input[type="number"].xs-num:focus {
    border-color: var(--xs-primary);
    box-shadow: 0 0 0 3px var(--xs-primary-glow);
    outline: none;
}

.xs-app select.xs-select {
    padding: 0.32rem 1.6rem 0.32rem 0.5rem;
    border: 1px solid var(--xs-border-strong);
    border-radius: 6px;
    background: var(--xs-bg);
    color: var(--xs-text);
    font-size: 0.8rem;
    font-family: inherit;
    max-width: 150px;
    height: auto;
    cursor: pointer;
}

.xs-app select.xs-select:focus {
    border-color: var(--xs-primary);
    outline: none;
}

.xs-app input[type="range"].xs-range {
    -webkit-appearance: none;
    appearance: none;
    width: 118px;
    height: 4px;
    border-radius: 2px;
    background: var(--xs-border-strong);
    cursor: pointer;
}

.xs-app input[type="range"].xs-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--xs-primary);
    border: 2px solid var(--xs-bg);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.xs-app input[type="range"].xs-range::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--xs-primary);
    border: 2px solid var(--xs-bg);
}

.xs-app input[type="color"].xs-color {
    width: 34px;
    height: 26px;
    padding: 2px;
    border: 1px solid var(--xs-border-strong);
    border-radius: 6px;
    background: var(--xs-bg);
    cursor: pointer;
}

.xs-app input[type="text"].xs-text,
.xs-app textarea.xs-textarea {
    width: 100%;
    padding: 0.38rem 0.5rem;
    border: 1px solid var(--xs-border-strong);
    border-radius: 6px;
    background: var(--xs-bg);
    color: var(--xs-text);
    font-size: 0.82rem;
    font-family: inherit;
    height: auto;
}

.xs-app textarea.xs-textarea { resize: vertical; min-height: 54px; }

.xs-field-note {
    font-size: 0.7rem;
    color: var(--xs-text-muted);
    margin: 0.2rem 0 0.4rem;
    line-height: 1.4;
}

.xs-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--xs-text-secondary);
    cursor: pointer;
}

.xs-check input { accent-color: var(--xs-primary); }

.xs-mini-btn-row { display: flex; gap: 0.4rem; margin-top: 0.55rem; flex-wrap: wrap; }
.xs-mini-btn-row .xs-btn { padding: 0.32rem 0.65rem; font-size: 0.75rem; }

/* ==================== VIEWPORT ==================== */
.xs-viewport {
    grid-area: viewport;
    position: relative;
    border: 1px solid var(--xs-border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--xs-shadow);
    background:
        repeating-conic-gradient(var(--xs-bg-inset) 0% 25%, var(--xs-bg-alt) 0% 50%)
        50% / 22px 22px;
    min-height: 420px;
}

.xs-viewport canvas { display: block; width: 100%; height: 100%; outline: none; }

.xs-hud {
    position: absolute;
    left: 12px;
    bottom: 10px;
    padding: 0.3rem 0.65rem;
    border-radius: 6px;
    background: rgba(15, 23, 42, 0.65);
    color: #e2e8f0;
    font-family: var(--xs-mono);
    font-size: 0.7rem;
    letter-spacing: 0.03em;
    pointer-events: none;
    backdrop-filter: blur(4px);
}

.xs-hud-right {
    position: absolute;
    right: 12px;
    bottom: 10px;
    padding: 0.3rem 0.65rem;
    border-radius: 6px;
    background: rgba(15, 23, 42, 0.65);
    color: #94a3b8;
    font-family: var(--xs-mono);
    font-size: 0.7rem;
    pointer-events: none;
    backdrop-filter: blur(4px);
}

/* ==================== LAYER MANAGER (boring-log strip) ==================== */
.xs-layers {
    grid-area: layers;
    background: var(--xs-bg-panel);
    border: 1px solid var(--xs-border);
    border-radius: 12px;
    box-shadow: var(--xs-shadow);
    padding: 0.65rem 0.75rem 0.75rem;
}

.xs-layers-head {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.55rem;
}

.xs-layers-head h3 {
    margin: 0;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--xs-text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.xs-layers-head h3 i { color: var(--xs-primary); }

.xs-layers-total {
    font-family: var(--xs-mono);
    font-size: 0.75rem;
    color: var(--xs-text-muted);
}

.xs-layers-head .xs-spacer { flex: 1; }

.xs-layer-rows { display: flex; flex-direction: column; gap: 0.2rem; }

/* Insert-a-layer-here affordance between rows */
.xs-layer-insert {
    position: relative;
    height: 12px;
    margin: -6px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.12s ease;
    z-index: 1;
}

.xs-layer-insert:hover,
.xs-layer-insert:focus-within { opacity: 1; }

.xs-layer-insert::before {
    content: '';
    position: absolute;
    left: 4px;
    right: 4px;
    top: 50%;
    height: 2px;
    margin-top: -1px;
    background: var(--xs-primary);
    border-radius: 1px;
}

.xs-app .xs-insert-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.08rem 0.6rem;
    border: 1px solid var(--xs-primary);
    border-radius: 999px;
    background: var(--xs-bg);
    color: var(--xs-primary) !important;
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    line-height: 1.5;
    cursor: pointer;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

.xs-app .xs-insert-btn:hover {
    background: var(--xs-primary);
    color: #fff !important;
}

.xs-layer-row {
    display: grid;
    grid-template-columns: 26px 44px minmax(120px, 1.2fr) minmax(150px, 1fr) 110px auto;
    align-items: center;
    gap: 0.6rem;
    padding: 0.35rem 0.55rem;
    border: 1px solid var(--xs-border);
    border-radius: 8px;
    background: var(--xs-bg);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    cursor: pointer;
}

.xs-layer-row:hover { border-color: var(--xs-border-strong); }

.xs-layer-row.is-selected {
    border-color: var(--xs-primary);
    box-shadow: 0 0 0 3px var(--xs-primary-glow);
}

.xs-layer-row.is-hidden { opacity: 0.55; }

.xs-layer-row.is-subgrade { border-style: dashed; }

.xs-layer-move { display: flex; flex-direction: column; gap: 1px; }

.xs-app .xs-layer-move button {
    border: none;
    background: none;
    color: var(--xs-text-muted) !important;
    font-size: 0.6rem;
    line-height: 1;
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 3px;
    box-shadow: none;
}

.xs-app .xs-layer-move button:hover:not(:disabled) { color: var(--xs-primary) !important; background: var(--xs-bg-inset); transform: none; }
.xs-app .xs-layer-move button:disabled { opacity: 0.25; cursor: default; }

.xs-layer-swatch {
    width: 44px;
    height: 30px;
    border-radius: 5px;
    border: 1px solid var(--xs-border-strong);
    background-size: cover;
    background-position: center;
    flex-shrink: 0;
}

.xs-layer-name input {
    width: 100%;
    border: 1px solid transparent;
    border-radius: 5px;
    background: transparent;
    color: var(--xs-text);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.2rem 0.35rem;
    font-family: inherit;
    height: auto;
}

.xs-layer-name input:hover { border-color: var(--xs-border); }
.xs-layer-name input:focus { border-color: var(--xs-primary); background: var(--xs-bg); outline: none; }

.xs-layer-name .xs-layer-spec {
    display: block;
    font-size: 0.66rem;
    color: var(--xs-text-muted);
    padding-left: 0.35rem;
    letter-spacing: 0.04em;
}

.xs-layer-thick {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--xs-mono);
    font-size: 0.72rem;
    color: var(--xs-text-muted);
    white-space: nowrap;
}

.xs-layer-actions { display: flex; gap: 0.15rem; justify-content: flex-end; }

.xs-app .xs-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 27px;
    height: 27px;
    border: none;
    border-radius: 6px;
    background: none;
    color: var(--xs-text-muted) !important;
    font-size: 0.75rem;
    padding: 0;
    cursor: pointer;
    transition: all 0.15s ease;
    box-shadow: none;
}

.xs-app .xs-icon-btn:hover:not(:disabled) { color: var(--xs-primary) !important; background: var(--xs-bg-inset); transform: none; }
.xs-app .xs-icon-btn.xs-icon-btn--danger:hover:not(:disabled) { color: var(--xs-danger) !important; background: rgba(239, 68, 68, 0.1); }
.xs-app .xs-icon-btn:disabled { opacity: 0.3; cursor: default; }
.xs-app .xs-icon-btn.is-active { color: var(--xs-primary) !important; }

/* ==================== MATERIAL LIBRARY (right panel) ==================== */
.xs-mat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.45rem;
    margin-top: 0.35rem;
}

.xs-app .xs-mat-tile {
    border: 1px solid var(--xs-border);
    border-radius: 8px;
    background: var(--xs-bg);
    padding: 0.3rem;
    cursor: pointer;
    text-align: center;
    transition: all 0.15s ease;
    box-shadow: none;
    font-weight: 400;
    font-size: inherit;
}

.xs-app .xs-mat-tile:hover {
    background: var(--xs-bg);
    border-color: var(--xs-primary);
    transform: translateY(-1px);
    box-shadow: none;
}

.xs-app .xs-mat-tile.is-active {
    border-color: var(--xs-primary);
    box-shadow: 0 0 0 3px var(--xs-primary-glow);
}

.xs-app .xs-mat-tile .xs-mat-thumb {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: 5px;
    background-color: var(--xs-bg-inset);
    background-size: cover;
    background-position: center;
    border: 1px solid var(--xs-border);
    margin-bottom: 0.25rem;
}

.xs-mat-group-label {
    grid-column: 1 / -1;
    margin: 0.45rem 0 -0.1rem;
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    color: var(--xs-text-muted);
}

.xs-mat-group-label:first-child { margin-top: 0.1rem; }

.xs-app .xs-mat-tile .xs-mat-label {
    display: block;
    font-size: 0.62rem;
    line-height: 1.25;
    color: var(--xs-text-secondary);
    font-weight: 600;
}

.xs-selected-layer-tag {
    display: inline-block;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding: 0.25rem 0.7rem;
    margin: 0.55rem 0.9rem 0;
    border-radius: 999px;
    background: var(--xs-bg-inset);
    border: 1px solid var(--xs-border);
    color: var(--xs-primary);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

/* ==================== TOAST ==================== */
.xs-toast-wrap {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10050;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    pointer-events: none;
}

.xs-toast {
    padding: 0.55rem 1.1rem;
    border-radius: 8px;
    background: var(--xs-bg-panel);
    border: 1px solid var(--xs-primary);
    color: var(--xs-text);
    font-size: 0.82rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    animation: xsToastIn 0.25s ease;
}

@keyframes xsToastIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1180px) {
    .xs-studio {
        grid-template-columns: 240px minmax(0, 1fr);
        grid-template-rows: auto minmax(380px, 56vh) auto auto;
        grid-template-areas:
            "toolbar toolbar"
            "left    viewport"
            "right   right"
            "layers  layers";
    }
}

@media (max-width: 800px) {
    .xs-studio {
        grid-template-columns: minmax(0, 1fr);
        grid-template-rows: auto minmax(320px, 50vh) auto auto auto;
        grid-template-areas:
            "toolbar"
            "viewport"
            "left"
            "right"
            "layers";
    }

    .xs-layer-row {
        grid-template-columns: 26px 40px minmax(90px, 1fr) 100px auto;
    }

    .xs-layer-row .xs-layer-mat-cell { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .xs-btn, .xs-layer-row, .xs-mat-tile, .xs-app .back-btn { transition: none; }
    .xs-toast { animation: none; }
}