:root {
    --bg:        #f4f4f7;
    --panel:     #ffffff;
    --border:    #d6d6dd;
    --accent:    #2563eb;
    --accent-fg: #ffffff;
    --muted:     #6b6b76;
    --header:    #f5f5fa;
    --error:     #b91c1c;
    --locked:    #a4a4ad;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: #1a1a1a;
    font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    height: 100%;
}

#app {
    max-width: 1100px;
    margin: 0 auto;
    padding: 12px 18px 24px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top bar */
#topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 8px 0 16px;
}
#topbar h1 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    flex: 1;
}

main { flex: 1; }

/* Generic chrome panel */
.chrome {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.hidden { display: none !important; }

/* Wizard chrome */
#wizard-header {
    background: var(--header);
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
}
#wizard-step-label {
    font-weight: 600;
    font-size: 15px;
}
#wizard-step-desc {
    color: var(--muted);
    margin-top: 4px;
    white-space: pre-wrap;
}
#wizard-content { padding: 16px; min-height: 320px; }

#wizard-footer, #propsheet-footer {
    border-top: 1px solid var(--border);
    padding: 10px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--header);
}
.spacer { flex: 1; }

/* Buttons */
button {
    font: inherit;
    padding: 6px 14px;
    border: 1px solid var(--border);
    background: var(--panel);
    border-radius: 4px;
    cursor: pointer;
}
button:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}
button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}
button.primary {
    background: var(--accent);
    color: var(--accent-fg);
    border-color: var(--accent);
}
button.primary:hover:not(:disabled) { color: var(--accent-fg); }
button.ghost { background: transparent; }

select {
    font: inherit;
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--panel);
}

/* Propsheet two-column body */
#propsheet-body {
    display: flex;
    min-height: 380px;
}
#propsheet-list {
    list-style: none;
    margin: 0;
    padding: 0;
    width: 220px;
    border-right: 1px solid var(--border);
    background: var(--header);
}
#propsheet-list li {
    padding: 8px 12px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    user-select: none;
}
#propsheet-list li:hover { background: #ebebf2; }
#propsheet-list li.active {
    background: var(--accent);
    color: var(--accent-fg);
}
#propsheet-list li.locked {
    color: var(--locked);
    cursor: not-allowed;
}
#propsheet-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}
#propsheet-page { flex: 1; padding: 16px; }
#propsheet-error {
    color: var(--error);
    padding: 0 16px 8px;
    min-height: 16px;
    font-size: 13px;
}

/* Fields */
.field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 14px;
    max-width: 600px;
}
.field.disabled { opacity: 0.55; }
.field label.field-label {
    font-weight: 500;
}
.field .tip {
    color: var(--muted);
    font-size: 12px;
}
.field input[type=text],
.field input[type=number],
.field textarea,
.field select {
    font: inherit;
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--panel);
}
.field textarea { resize: vertical; min-height: 80px; }
.field.checkbox, .field.radio {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}
.field.checkbox label, .field.radio label { font-weight: normal; }
.field .pathrow { display: flex; gap: 6px; }
.field .pathrow input { flex: 1; }

/* Section divider - heading-only row, no input */
.field.section {
    margin: 18px 0 6px 0;
    border-top: 1px solid var(--border);
    padding-top: 10px;
}
.field.section .section-heading {
    margin: 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--muted);
    text-transform: none;
    letter-spacing: 0;
}

/* Action buttons embedded in a wizard page */
.field.button {
    flex-direction: row;
    align-items: flex-start;
    margin-bottom: 10px;
}
.field.button button.wizard-action {
    font: inherit;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--panel);
    cursor: pointer;
}
.field.button button.wizard-action:hover {
    background: var(--accent);
    color: var(--accent-fg);
    border-color: var(--accent);
}

.field-error {
    color: var(--error);
    font-size: 12px;
    min-height: 14px;
}

/* Clamp grid (step 8 hand-coded) */
.clamp-grid table {
    border-collapse: collapse;
    width: 100%;
    max-width: 360px;
    margin-top: 8px;
}
.clamp-grid th, .clamp-grid td {
    border: 1px solid var(--border);
    padding: 4px 8px;
    text-align: left;
}
.clamp-grid th { background: var(--header); font-weight: 500; }
.clamp-grid tr.selected { background: #dbeafe; }
.clamp-grid .row-actions { margin-top: 6px; display: flex; gap: 6px; }

/* PEPS viewer (3D STEP/IGES via occt-import-js + three.js) */
.peps-viewer { max-width: none; }
.peps-viewer .viewer-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
}
.peps-viewer .viewer-status {
    color: var(--muted);
    font-size: 12px;
    flex: 1;
    min-width: 200px;
}
.peps-viewer .viewer-status.error {
    color: var(--error);
    font-weight: 600;
}
/* Loading state: amber pill. Scoped to viewer-status only so it works
   in both .peps-viewer (embedded) and .cad-viewer-host (standalone). */
.viewer-status.loading {
    background: #fff3cd;
    border-radius: 3px;
    padding: 1px 7px;
    color: #7a5500;
    font-weight: 500;
}
.peps-viewer .viewer-sep {
    width: 1px;
    height: 22px;
    background: var(--border);
    margin: 0 4px;
}
.peps-viewer .viewer-toolbar button.active {
    background: var(--accent);
    color: var(--accent-fg);
    border-color: var(--accent);
}
.peps-viewer .viewer-toolbar button.snap-toggle {
    padding: 4px 9px;
    font-weight: 600;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    min-width: 26px;
}
.peps-viewer .viewer-toolbar button.snap-toggle.active {
    background: #475569;
    color: #ffffff;
    border-color: #475569;
}
.peps-viewer .viewer-toolbar button.snap-toggle:not(.active) {
    color: var(--muted);
}
.peps-viewer .viewer-toolbar button.up-axis-toggle {
    padding: 4px 9px;
    font-weight: 600;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    min-width: 30px;
}
.peps-viewer .viewer-toolbar button.view-preset {
    padding: 4px 8px;
    min-width: 34px;
    font-size: 12px;
}
.peps-viewer .viewer-toolbar button.proj-toggle {
    padding: 4px 9px;
    font-weight: 600;
    min-width: 50px;
    font-size: 12px;
}
.peps-viewer .viewer-toolbar input.bg-picker {
    width: 28px;
    height: 26px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
}
.peps-viewer .viewer-toolbar button.bg-reset {
    padding: 4px 7px;
    font-size: 14px;
    min-width: 26px;
}
.peps-viewer .viewer-toolbar button.spin-toggle {
    padding: 4px 10px;
    font-size: 12px;
}
.peps-viewer .viewer-toolbar button.dxf-toggle {
    padding: 4px 10px;
    font-size: 12px;
}
.peps-viewer .viewer-toolbar button.measure-toggle {
    padding: 4px 10px;
    font-size: 12px;
}

/* Pressed state for every toggle in the toolbar.
   These buttons all carried an .active class and nothing styled it, so a
   toggle looked identical on and off - you could only tell by whether the
   drawing changed. Inset shadow plus a darker ground reads as pushed in at
   a glance, which is what a toggle owes you. */
.peps-viewer .viewer-toolbar button.dxf-toggle.active,
.peps-viewer .viewer-toolbar button.measure-toggle.active {
    background: #1f6fd0;
    border-color: #1a5fb4;
    color: #fff;
    /* NOT font-weight. Bold glyphs are wider, so pressing a toggle changed
       its width and the wrapping toolbar re-flowed - buttons jumped to
       another line out from under the cursor. text-shadow thickens the
       glyphs without touching their metrics. */
    text-shadow: 0 0 0.4px currentColor, 0 0 0.4px currentColor;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.28);
}
.peps-viewer .viewer-toolbar button.dxf-toggle.active:hover,
.peps-viewer .viewer-toolbar button.measure-toggle.active:hover {
    background: #1a5fb4;
}
/* Disabled must not be mistakeable for pressed. */
.peps-viewer .viewer-toolbar button.dxf-toggle:disabled {
    opacity: 0.42;
    box-shadow: none;
}
/* Measure readout. Amber when live so it reads as the same object as
   the amber measurement line on the drawing. */
.peps-viewer .viewer-toolbar .viewer-measure-out {
    color: #92400e;
    font-weight: 600;
}
.peps-viewer .viewer-toolbar input.dxf-fill-color {
    width: 28px;
    height: 26px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
}
.peps-viewer .viewer-toolbar input.dxf-fill-color:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.peps-viewer .viewer-toolbar input.dxf-fill-opacity {
    width: 80px;
    height: 18px;
    cursor: pointer;
}
.peps-viewer .viewer-toolbar input.dxf-fill-opacity:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.peps-viewer .viewer-canvas {
    border: 1px solid var(--border);
    border-radius: 4px;
    background: #1f2937;
    color: #d1d5db;
    min-height: 480px;
    height: 480px;
    width: 100%;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    transition: border-color 120ms, background 120ms;
}
.peps-viewer .viewer-canvas.drag-over {
    border-color: var(--accent);
    background: #28354a;
}
.peps-viewer .viewer-hint {
    padding: 24px;
    color: #d1d5db;
    pointer-events: none;
}
.peps-viewer .viewer-hint em { color: #9ca3af; }

/* Summary block */
.summary-text {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    white-space: pre-wrap;
    background: #fafafe;
    border: 1px solid var(--border);
    padding: 12px;
    border-radius: 4px;
}

/* Result */
#result-pane { padding: 18px; }
#result-pane pre {
    background: #0f172a;
    color: #d1d5db;
    padding: 14px;
    border-radius: 4px;
    overflow: auto;
    font: 12px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

#footer-note {
    color: var(--muted);
    font-size: 12px;
    margin-top: 18px;
    text-align: center;
}

/* Confirm dialog (themed yes/no modal) */
.confirm-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.confirm-overlay.open { display: flex; }
.confirm-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 6px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.18);
    min-width: 340px;
    max-width: 480px;
    padding: 18px 20px 14px;
}
.confirm-title {
    margin: 0 0 8px;
    font-size: 15px;
    font-weight: 600;
}
.confirm-msg {
    margin: 0 0 18px;
    color: #1a1a1a;
    line-height: 1.4;
}
.confirm-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}