:root {
    --ink: #0f172a;
    --ink-soft: #1e293b;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --text-faint: #94a3b8;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --surface-3: #f1f5f9;
    --border: #e2e8f0;
    --border-strong: #cbd5e1;
    --accent: #0f766e;
    --accent-hover: #0d9488;
    --accent-soft: rgba(15, 118, 110, 0.10);
    --accent-ring: rgba(15, 118, 110, 0.22);
    --danger: #b91c1c;
    --danger-soft: #fef2f2;
    --danger-border: #fecaca;
    --concrete: #64748b;
    --eps: #0f766e;
    --sidebar-w: 380px;
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
    --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
    --font: "IBM Plex Sans", "Segoe UI", sans-serif;
    --mono: "IBM Plex Mono", ui-monospace, monospace;

    /* legacy aliases used in JS toggles */
    --primary: var(--accent);
    --primary-hover: var(--accent-hover);
    --text-main: #1e293b;
    --border-color: var(--border);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: var(--font);
    color: var(--text-main);
    background:
        radial-gradient(1200px 600px at 70% -10%, rgba(15, 118, 110, 0.08), transparent 55%),
        linear-gradient(180deg, #e8eef3 0%, #dbe4ec 100%);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* ── Sidebar ─────────────────────────────────────────── */

#sidebar {
    position: absolute;
    top: 0;
    left: 0;
    width: var(--sidebar-w);
    height: 100%;
    background: var(--surface);
    border-right: 1px solid var(--border);
    box-shadow: 4px 0 32px rgba(15, 23, 42, 0.06);
    overflow: hidden;
    z-index: 30;
    padding: 0;
    display: flex;
    flex-direction: column;
}

.sidebar-scroll {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 14px 14px 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-sticky {
    flex: 0 0 auto;
    padding: 10px 14px 14px;
    border-top: 1px solid var(--border);
    background: linear-gradient(180deg, #f8fafc 0%, #fff 40%);
    box-shadow: 0 -6px 16px rgba(15, 23, 42, 0.04);
}

.sticky-kpi {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 8px;
}

.sticky-kpi-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    text-align: center;
}

.sticky-kpi-label {
    display: block;
    font-size: 0.62rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 2px;
}

.sticky-kpi-value {
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--ink);
}

.app-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 2px 2px 8px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2px;
    flex-shrink: 0;
}

.brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 9px;
    display: grid;
    place-items: center;
    color: var(--accent);
    background: linear-gradient(145deg, #ecfdf8 0%, #e0f2f1 100%);
    border: 1px solid #ccfbf1;
    flex-shrink: 0;
}

.brand-name {
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--ink);
    line-height: 1.1;
}

.brand-sub {
    margin-top: 2px;
    font-size: 0.7rem;
    color: var(--text-muted);
    line-height: 1.25;
}

.panel {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0;
    overflow: hidden;
}

.panel-head {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 8px 10px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-family: var(--font);
    text-align: left;
}

.panel-head:hover {
    background: rgba(15, 118, 110, 0.04);
}

.panel-title {
    font-size: 0.66rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin: 0;
}

.panel-chevron {
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--text-faint);
    border-bottom: 2px solid var(--text-faint);
    transform: rotate(45deg);
    transition: transform 0.15s;
    flex-shrink: 0;
    margin-right: 4px;
}

.panel.is-collapsed .panel-chevron {
    transform: rotate(-45deg);
    margin-top: 2px;
}

.panel-body {
    padding: 0 10px 10px;
}

.panel.is-collapsed .panel-body {
    display: none;
}

.field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.input-group {
    margin-bottom: 8px;
}

.input-group:last-child {
    margin-bottom: 0;
}

.pile-soil-row {
    margin-top: 8px;
}

label {
    display: flex;
    align-items: baseline;
    gap: 6px;
    margin-bottom: 4px;
    font-weight: 500;
    font-size: 0.78rem;
    color: var(--ink-soft);
}

.unit {
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 500;
    color: var(--text-faint);
    text-transform: none;
    letter-spacing: 0;
}

input[type="number"],
input[type="text"],
select {
    width: 100%;
    padding: 7px 9px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-family: var(--mono);
    font-weight: 500;
    color: var(--ink);
    background: var(--surface);
    transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

input[type="number"]:hover,
select:hover {
    border-color: #94a3b8;
}

input[type="number"]:focus,
select:focus {
    border-color: var(--accent);
    background: #fff;
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-ring);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2364748b' d='M1.2 1.5L6 6.3l4.8-4.8' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
}

.multi-input {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.thickness-field {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px;
}

.thickness-field label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.thickness-field select {
    padding: 7px 8px;
    padding-right: 26px;
    font-size: 0.85rem;
    background-color: var(--surface-2);
}

.shape-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.shape-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px 6px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text-muted);
    cursor: pointer;
    font-family: var(--font);
    font-size: 0.7rem;
    font-weight: 600;
    transition: border-color 0.15s, background 0.15s, color 0.15s, box-shadow 0.15s;
}

.shape-btn svg {
    width: 24px;
    height: 24px;
}

.shape-btn:hover {
    border-color: var(--border-strong);
    color: var(--ink-soft);
    background: var(--surface-3);
}

.shape-btn.active {
    border-color: #5eead4;
    background: var(--accent-soft);
    color: var(--accent);
    box-shadow: 0 0 0 1px rgba(15, 118, 110, 0.15);
}

.check-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    user-select: none;
}

.check-row input[type="checkbox"] {
    margin-top: 3px;
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    flex-shrink: 0;
    cursor: pointer;
}

.check-title {
    display: block;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--ink);
}

.check-sub {
    display: block;
    margin-top: 1px;
    font-size: 0.68rem;
    color: var(--text-muted);
    line-height: 1.3;
}

.piles-fields {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}

.piles-fields[hidden] {
    display: none !important;
}

.spec-chip {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px dashed var(--border-strong);
    font-size: 0.68rem;
    color: var(--text-muted);
    font-family: var(--mono);
}

.spec-chip .dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--text-faint);
}

.note {
    font-size: 0.68rem;
    color: var(--text-faint);
    margin-top: 4px;
    line-height: 1.3;
}

/* ── Actions ─────────────────────────────────────────── */

.actions {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

button.primary-btn,
button.secondary-btn {
    width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: var(--radius);
    cursor: pointer;
    font-family: var(--font);
    font-weight: 600;
    transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.1s, box-shadow 0.15s;
}

button.primary-btn {
    padding: 10px 12px;
    background: linear-gradient(180deg, #11998a 0%, var(--accent) 100%);
    color: #fff;
    border: 1px solid #0f766e;
    font-size: 0.88rem;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.2) inset, 0 4px 12px rgba(15, 118, 110, 0.24);
}

button.primary-btn:hover {
    background: linear-gradient(180deg, #14b8a6 0%, var(--accent-hover) 100%);
}

button.primary-btn:active {
    transform: translateY(1px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.15) inset, 0 2px 8px rgba(15, 118, 110, 0.2);
}

button.secondary-btn {
    padding: 9px 12px;
    background: var(--surface);
    color: var(--text-muted);
    border: 1px solid var(--border);
    font-size: 0.82rem;
    font-weight: 500;
}

button.secondary-btn:hover {
    background: var(--surface-3);
    color: var(--text-main);
    border-color: var(--border-strong);
}

button.secondary-btn.danger {
    color: var(--danger);
    border-color: var(--danger-border);
    background: var(--danger-soft);
}

button.secondary-btn.danger:hover {
    background: #fee2e2;
    border-color: #f87171;
}

/* ── Results ─────────────────────────────────────────── */

.results-panel {
    margin-top: 0;
}

.metric-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 10px;
}

.metric-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px;
}

.metric-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.metric-value {
    display: flex;
    align-items: baseline;
    gap: 5px;
    font-family: var(--mono);
    font-weight: 600;
    font-size: 1.35rem;
    color: var(--ink);
    line-height: 1;
}

.metric-unit {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-faint);
}

.sheet-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.sheet-card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 9px 12px;
    background: var(--surface-3);
    border-bottom: 1px solid var(--border);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.sheet-total {
    font-family: var(--mono);
    color: var(--accent);
    text-transform: none;
    letter-spacing: 0;
    font-size: 0.78rem;
}

.sheet-list {
    padding: 4px 0;
}

.sheet-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    font-size: 0.84rem;
    border-bottom: 1px solid var(--surface-3);
}

.sheet-row:last-child {
    border-bottom: none;
}

.sheet-row-label {
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sheet-swatch {
    width: 8px;
    height: 8px;
    border-radius: 2px;
    flex-shrink: 0;
}

.sheet-swatch.outer { background: #f7e4e8; border: 1px solid #edd0d6; }
.sheet-swatch.inner { background: #fceef1; border: 1px solid #f7e4e8; }
.sheet-swatch.bottom { background: #edd0d6; border: 1px solid #d4a0aa; }

.sheet-row-value {
    font-family: var(--mono);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--ink);
}

.sheet-row-value span {
    font-weight: 400;
    color: var(--text-faint);
    font-size: 0.75rem;
    margin-left: 2px;
}

/* ── Workspace ───────────────────────────────────────── */

#workspace {
    position: absolute;
    top: 0;
    left: var(--sidebar-w);
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
}

#toolbar {
    position: absolute;
    top: 16px;
    left: 0;
    right: 0;
    z-index: 20;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}

.mode-switch {
    display: flex;
    gap: 2px;
    padding: 4px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: 999px;
    box-shadow: var(--shadow-md);
    pointer-events: auto;
}

.mode-switch button {
    background: transparent;
    border: none;
    padding: 8px 18px;
    border-radius: 999px;
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: background 0.15s, color 0.15s, box-shadow 0.15s;
    margin: 0;
}

.mode-switch button:hover {
    color: var(--ink-soft);
    background: var(--surface-3);
}

.mode-switch button.active {
    background: var(--ink);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.viewport-meta {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(226, 232, 240, 0.9);
    padding: 4px 10px;
    border-radius: 999px;
    pointer-events: none;
}

#canvas-container {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 40%, #f1f5f9 0%, #dce5ee 70%, #cfd9e4 100%);
}

#canvas-2d {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    background: #fafbfc;
    display: none;
}

/* ── Bill view ───────────────────────────────────────── */

#bill-view,
#thermal-view,
#assembly-view,
#analysis-view {
    position: absolute;
    inset: 0;
    background: var(--surface-2);
    display: none;
    padding: 72px 40px 40px;
    overflow-y: auto;
}

.thermal-intro {
    max-width: 720px;
    margin-bottom: 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.45;
}

.eps-type-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    max-width: 820px;
    margin-bottom: 8px;
}

.eps-type-btn {
    display: flex;
    flex-direction: column;
    gap: 6px;
    align-items: flex-start;
    text-align: left;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    cursor: pointer;
    font-family: var(--font);
    color: var(--ink-soft);
    transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.eps-type-btn:hover {
    border-color: var(--accent);
    background: var(--surface-3);
}

.eps-type-btn.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(15, 118, 110, 0.2);
    background: #f0fdfa;
}

.eps-type-btn .eps-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--ink);
}

.eps-type-btn .eps-lambda {
    font-family: var(--font-mono, "IBM Plex Mono", monospace);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
}

.eps-type-btn .eps-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.35;
}

.thermal-kpi-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    max-width: 820px;
    margin: 20px 0 8px;
}

.thermal-kpi {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
}

.thermal-kpi .kpi-label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.thermal-kpi .kpi-value {
    font-family: var(--font-mono, "IBM Plex Mono", monospace);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--ink);
}

.thermal-kpi .kpi-unit {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-left: 4px;
}

.thermal-note {
    max-width: 820px;
    margin-top: 16px;
    padding: 12px 14px;
    border-radius: var(--radius);
    background: var(--surface-3);
    border: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.45;
}

@media (max-width: 900px) {
    .eps-type-grid,
    .thermal-kpi-row {
        grid-template-columns: 1fr;
    }
}

.assembly-intro {
    max-width: 760px;
    margin: 0 0 16px;
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.45;
}

.assembly-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    max-width: 820px;
    margin-bottom: 20px;
}

.assembly-chip {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--ink-soft);
}

.assembly-list {
    list-style: none;
    margin: 0;
    padding: 0;
    max-width: 820px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.assembly-step {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
}

.assembly-step-num {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    display: grid;
    place-items: center;
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 700;
    font-size: 0.85rem;
    font-family: var(--mono);
}

.assembly-step-title {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 4px;
}

.assembly-step-body p {
    margin: 0 0 8px;
    font-size: 0.86rem;
    line-height: 1.45;
    color: var(--text-muted);
}

.assembly-step-body strong {
    color: var(--ink-soft);
}

.assembly-step-content {
    font-size: 0.86rem;
    line-height: 1.45;
    color: var(--text-muted);
}

.assembly-step-content p {
    margin: 0 0 8px;
}

.assembly-subhead {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--ink);
    margin: 14px 0 8px;
}

.assembly-mini {
    margin: 8px 0 12px;
    padding-left: 1.2rem;
    color: var(--text-muted);
}

.assembly-mini li {
    margin-bottom: 4px;
}

.assembly-callout {
    margin: 10px 0 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    background: #f0fdfa;
    border: 1px solid #99f6e4;
    font-size: 0.82rem;
    color: var(--ink-soft);
    line-height: 1.4;
}

.assembly-seq {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin: 10px 0 12px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent);
}

.assembly-seq span:not(.seq-arrow) {
    padding: 4px 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
}

.seq-arrow {
    color: var(--text-faint);
    font-weight: 400;
}

.assembly-scheme {
    margin: 12px 0 8px;
    max-width: 820px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 12px 12px;
    overflow: hidden;
}

.assembly-scheme-label {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 8px;
}

.assembly-svg {
    display: block;
    width: 100%;
    height: auto;
    max-height: 360px;
    border-radius: 6px;
}

.join-svg {
    max-width: 360px;
    margin: 8px 0 4px;
}

.assembly-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 8px;
    font-size: 0.72rem;
    color: var(--text-muted);
}

.assembly-legend i {
    display: inline-block;
    width: 14px;
    height: 10px;
    border-radius: 2px;
    margin-right: 4px;
    vertical-align: middle;
}

.lg-full {
    background: #f7e4e8;
    border: 1.5px solid #d4a0aa;
}

.lg-cut {
    background: #ffedd5;
    border: 1.5px dashed #ea580c;
}

.assembly-cut-table {
    max-width: 820px;
    margin-bottom: 10px;
}

.assembly-cut-table .cut-row td {
    color: #c2410c;
}

.assembly-chip.chip-cut {
    border-color: #fdba74;
    background: #fff7ed;
    color: #c2410c;
}

.assembly-overview {
    max-width: 820px;
    margin-bottom: 8px;
}

.assembly-empty {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.analysis-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    max-width: 900px;
    margin-bottom: 8px;
}

.analysis-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
}

.analysis-card-title {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 6px;
}

.analysis-card p {
    margin: 0;
    font-size: 0.82rem;
    line-height: 1.45;
    color: var(--text-muted);
}

.analysis-card.strong {
    border-color: #99f6e4;
    background: #f0fdfa;
}

.analysis-card.weak-high {
    border-color: #fca5a5;
    background: #fef2f2;
}

.analysis-card.weak-med {
    border-color: #fcd34d;
    background: #fffbeb;
}

.analysis-card.weak-low {
    border-color: #cbd5e1;
    background: var(--surface);
}

.analysis-soil {
    max-width: 900px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    margin-bottom: 8px;
}

.analysis-soil ul {
    margin: 8px 0 0;
    padding-left: 1.2rem;
    color: var(--text-muted);
    font-size: 0.86rem;
    line-height: 1.45;
}

.analysis-soil-meta {
    margin: 10px 0 0;
    font-size: 0.78rem;
    color: var(--text-faint);
}

.analysis-actions-table {
    max-width: 900px;
}

@media (max-width: 900px) {
    .analysis-grid {
        grid-template-columns: 1fr;
    }
}

.bill-header {
    font-size: 0.95rem;
    font-weight: 700;
    margin: 28px 0 12px;
    color: var(--ink);
    display: flex;
    align-items: center;
    gap: 10px;
}

.bill-header::before {
    content: "";
    width: 4px;
    height: 1.1em;
    border-radius: 2px;
    background: var(--accent);
}

.bill-header:first-child {
    margin-top: 0;
}

.bill-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 8px;
    box-shadow: var(--shadow-sm);
}

.bill-table th,
.bill-table td {
    padding: 11px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    color: var(--text-main);
    font-size: 0.88rem;
}

.bill-table th {
    background: var(--surface-3);
    font-weight: 600;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.bill-table tr:last-child td {
    border-bottom: none;
}

.bill-table td strong {
    font-family: var(--mono);
    color: var(--accent);
    font-size: 0.95rem;
}

.bill-export {
    margin: 8px 0 20px;
}

.bill-export .primary-btn {
    max-width: 320px;
}

/* ── Zoom / 2D tools ─────────────────────────────────── */

#zoom-toolbar {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 6px;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    display: none;
    flex-direction: column;
    gap: 4px;
    z-index: 25;
}

#zoom-toolbar .tool-divider {
    height: 1px;
    background: var(--border);
    margin: 4px 2px;
}

#zoom-toolbar button {
    width: 36px;
    height: 36px;
    border: 1px solid transparent;
    background: transparent;
    border-radius: 8px;
    font-size: 1.05rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ink-soft);
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

#zoom-toolbar button:hover {
    background: var(--surface-3);
    color: var(--accent);
}

#zoom-toolbar button.active-tool {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: #99f6e4;
}

/* ── Scrollbar ───────────────────────────────────────── */

#sidebar::-webkit-scrollbar,
.sidebar-scroll::-webkit-scrollbar,
#bill-view::-webkit-scrollbar,
#thermal-view::-webkit-scrollbar,
#assembly-view::-webkit-scrollbar,
#analysis-view::-webkit-scrollbar {
    width: 8px;
}

#sidebar::-webkit-scrollbar-track,
.sidebar-scroll::-webkit-scrollbar-track,
#bill-view::-webkit-scrollbar-track,
#thermal-view::-webkit-scrollbar-track,
#assembly-view::-webkit-scrollbar-track,
#analysis-view::-webkit-scrollbar-track {
    background: transparent;
}

#sidebar::-webkit-scrollbar-thumb,
.sidebar-scroll::-webkit-scrollbar-thumb,
#bill-view::-webkit-scrollbar-thumb,
#thermal-view::-webkit-scrollbar-thumb,
#assembly-view::-webkit-scrollbar-thumb,
#analysis-view::-webkit-scrollbar-thumb {
    background-color: #cbd5e1;
    border-radius: 4px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

#sidebar::-webkit-scrollbar-thumb:hover,
.sidebar-scroll::-webkit-scrollbar-thumb:hover,
#bill-view::-webkit-scrollbar-thumb:hover,
#thermal-view::-webkit-scrollbar-thumb:hover,
#assembly-view::-webkit-scrollbar-thumb:hover,
#analysis-view::-webkit-scrollbar-thumb:hover {
    background-color: #94a3b8;
}

/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 1100px) {
    :root {
        --sidebar-w: 340px;
    }

    .mode-switch button {
        padding: 7px 10px;
        font-size: 0.74rem;
    }
}

@media (max-width: 860px) {
    body {
        overflow: auto;
    }

    #sidebar {
        position: relative;
        width: 100%;
        height: auto;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid var(--border);
        overflow: visible;
    }

    .sidebar-scroll {
        overflow: visible;
        flex: none;
    }

    .sidebar-sticky {
        position: sticky;
        bottom: 0;
        z-index: 5;
    }

    #workspace {
        position: relative;
        left: 0;
        height: 70vh;
        min-height: 480px;
    }

    #toolbar {
        top: 12px;
    }
}

/* ── Print actions / doc header ──────────────────────── */

.print-actions {
    display: flex;
    gap: 10px;
    margin: 0 0 18px;
    max-width: 820px;
}

.print-actions .primary-btn {
    width: auto;
    min-width: 240px;
    padding: 11px 18px;
}

.print-doc-header {
    display: none;
}

.print-footer-note {
    display: none;
    margin-top: 24px;
    font-size: 0.75rem;
    color: #94a3b8;
}

.bill-total-row td {
    background: var(--surface-3);
}

/* ── Print ───────────────────────────────────────────── */

@media print {
    @page {
        size: A4;
        margin: 12mm 14mm;
    }

    html,
    body {
        background: #fff !important;
        overflow: visible !important;
        height: auto !important;
        color: #0f172a;
    }

    #sidebar,
    #toolbar,
    #zoom-toolbar,
    .no-print,
    .print-actions,
    .screen-only {
        display: none !important;
    }

    #workspace,
    #canvas-container {
        position: static !important;
        left: auto !important;
        inset: auto !important;
        width: 100% !important;
        height: auto !important;
        min-height: 0 !important;
        overflow: visible !important;
        background: #fff !important;
        padding: 0 !important;
        margin: 0 !important;
    }

    #canvas-2d,
    #canvas-container > canvas,
    #thermal-view {
        display: none !important;
    }

    #bill-view,
    #assembly-view,
    #analysis-view {
        display: none !important;
        position: static !important;
        inset: auto !important;
        width: 100% !important;
        height: auto !important;
        overflow: visible !important;
        background: #fff !important;
        padding: 0 !important;
        margin: 0 !important;
    }

    body[data-print-doc="bill"] #bill-view,
    body[data-print-doc="assembly"] #assembly-view,
    body[data-print-doc="analysis"] #analysis-view {
        display: block !important;
    }

    /* jei data-print-doc nenustatytas — atsarginis */
    body:not([data-print-doc]) #bill-view:not([style*="display: none"]),
    body:not([data-print-doc]) #assembly-view:not([style*="display: none"]),
    body:not([data-print-doc]) #analysis-view:not([style*="display: none"]) {
        display: block !important;
    }

    .print-doc-header {
        display: block !important;
        margin: 0 0 18px;
        padding-bottom: 12px;
        border-bottom: 2px solid #0f766e;
    }

    .print-doc-brand {
        font-size: 11pt;
        font-weight: 700;
        letter-spacing: 0.14em;
        color: #0f766e;
    }

    .print-doc-title {
        margin-top: 4px;
        font-size: 16pt;
        font-weight: 700;
        color: #0f172a;
    }

    .print-doc-meta {
        margin-top: 4px;
        font-size: 9pt;
        color: #64748b;
    }

    .print-footer-note {
        display: block !important;
        page-break-inside: avoid;
    }

    .bill-header {
        margin: 16px 0 8px;
        font-size: 11pt;
        page-break-after: avoid;
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }

    .bill-table {
        box-shadow: none !important;
        border-radius: 0 !important;
        page-break-inside: auto;
        max-width: none !important;
        width: 100% !important;
    }

    .bill-table th,
    .bill-table td {
        padding: 6px 8px;
        font-size: 9pt;
    }

    .bill-table thead {
        display: table-header-group;
    }

    .bill-table tr {
        page-break-inside: avoid;
    }

    .bill-total-row td,
    .bill-table th {
        background: #f1f5f9 !important;
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }

    .assembly-intro {
        font-size: 9pt;
        max-width: none;
    }

    .assembly-chips {
        max-width: none;
        margin-bottom: 12px;
    }

    .assembly-chip {
        font-size: 8pt;
        padding: 3px 7px;
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }

    .assembly-list {
        max-width: none;
        gap: 10px;
    }

    .assembly-step {
        break-inside: avoid;
        page-break-inside: avoid;
        box-shadow: none;
        padding: 10px 12px;
        border-color: #cbd5e1;
    }

    .assembly-step-num {
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }

    .assembly-step-title {
        font-size: 10.5pt;
        page-break-after: avoid;
    }

    .assembly-step-content,
    .assembly-step-content p {
        font-size: 9pt;
        color: #334155 !important;
    }

    .assembly-scheme {
        break-inside: avoid;
        page-break-inside: avoid;
        max-width: none;
        box-shadow: none;
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }

    .assembly-svg {
        max-height: 280px;
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }

    .assembly-callout,
    .thermal-note {
        break-inside: avoid;
        page-break-inside: avoid;
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
        font-size: 8.5pt;
    }

    .assembly-cut-table {
        max-width: none;
    }

    .assembly-overview,
    .assembly-seq {
        max-width: none;
    }

    .assembly-seq span:not(.seq-arrow) {
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }

    .analysis-grid {
        grid-template-columns: 1fr 1fr;
        max-width: none;
        break-inside: avoid;
    }

    .analysis-card,
    .analysis-soil {
        break-inside: avoid;
        page-break-inside: avoid;
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
        max-width: none;
    }

    .analysis-actions-table {
        max-width: none;
    }
}
.silto-return {
    display: inline-flex;
    align-items: center;
    margin: 14px 16px 0;
    padding: 7px 10px;
    border: 1px solid var(--border, #d7dce1);
    border-radius: 6px;
    color: var(--text, #263238);
    background: rgba(255, 255, 255, .72);
    font-size: 12px;
    font-weight: 700;
    line-height: 1;
    text-decoration: none;
}

.silto-return:hover {
    border-color: #4d7564;
    color: #315f50;
}