/* =========================================================
   SKY Metal Weight Calculator — Mobile
   app.css  |  All styles for the PWA
   ========================================================= */

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: #E8E6E0;
  color: var(--ink);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}
html[data-theme="blueprint"] body { background: #05101B; }
html[data-theme="paper"]     body { background: #E4DCC9; }

#root { min-height: 100vh; }

.mono {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.strong { font-weight: 600; }
.accent { color: var(--accent); }

/* ---------- CSS custom properties (light theme defaults) ---------- */
:root {
  --canvas:       #FAFAF7;
  --panel:        #FFFFFF;
  --ink:          #0E0E0C;
  --ink-2:        #3A3A36;
  --ink-3:        #7A7A74;
  --rule:         rgba(14,14,12,0.10);
  --rule-strong:  rgba(14,14,12,0.22);
  --grid:         rgba(14,14,12,0.05);
  --metal-fill:   rgba(14,14,12,0.06);
  --dim-line:     rgba(14,14,12,0.3);
  --dim-text:     rgba(14,14,12,0.55);
  --hover:        rgba(14,14,12,0.04);
  --selected:     rgba(14,14,12,0.08);
  --input-bg:     #FFFFFF;
  --danger:       oklch(0.58 0.16 25);
  --chrome:       #F2F2EF;
  --accent:       oklch(0.62 0.14 55);
}

/* ---------- Frame stage (desktop preview wrapper) ---------- */
.frame-stage {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 40px 20px;
  background-image:
    linear-gradient(rgba(14,14,12,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,14,12,0.035) 1px, transparent 1px);
  background-size: 48px 48px;
}
html[data-theme="blueprint"] .frame-stage {
  background-image:
    linear-gradient(rgba(230,240,250,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230,240,250,0.04) 1px, transparent 1px);
}
.no-frame-wrap {
  min-height: 100vh;
  background: var(--canvas);
  display: flex;
  flex-direction: column;
  max-width: 440px;
  margin: 0 auto;
  border-left: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
}

/* ---------- Mobile root ---------- */
.mv-root {
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--canvas);
  min-height: 0;
  padding-top: 60px; /* iOS status bar / dynamic island clearance */
  position: relative;
}
.no-frame-wrap .mv-root { height: 100vh; padding-top: 0; }

/* ---------- App bar ---------- */
.mv-appbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px 10px;
  border-bottom: 1px solid var(--rule);
  background: var(--canvas);
  flex-shrink: 0;
}
.mv-appbar-brand { display: flex; align-items: center; gap: 10px; }
.mv-logo-img {
  height: 30px; width: auto; display: block;
  object-fit: contain;
}
html[data-theme="blueprint"] .mv-logo-img { filter: brightness(1.3) saturate(1.1); }
.mv-brand-name { font-weight: 700; font-size: 12px; letter-spacing: 0.18em; color: var(--ink); line-height: 1.1; }
.mv-brand-sub  { font-size: 10px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.14em; margin-top: 2px; }
.mv-icon-btn {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: transparent;
  border: 1px solid var(--rule-strong);
  color: var(--ink); cursor: pointer; border-radius: 0;
}
.mv-icon-btn:hover { background: var(--hover); }

/* ---------- Scroll area ---------- */
.mv-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 0;
}
.mv-scroll::-webkit-scrollbar { width: 0; }

/* ---------- Hero preview ---------- */
.mv-hero { padding: 16px 16px 0; }
.mv-hero-preview {
  background: var(--panel);
  border: 1px solid var(--rule-strong);
  aspect-ratio: 1 / 0.7;
  display: grid; place-items: center;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 18px 18px;
}
.mv-hero-preview svg { width: 100%; height: 100%; max-height: 240px; }
.mv-hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  border: 1px solid var(--rule-strong);
  border-top: none;
  background: var(--panel);
}
.mv-stat {
  padding: 10px 12px;
  border-right: 1px solid var(--rule);
  display: flex; flex-direction: column; gap: 3px;
}
.mv-stat:last-child { border-right: none; }
.mv-stat-k { font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3); }
.mv-stat-v { font-size: 13px; color: var(--ink); }

/* ---------- Sections ---------- */
.mv-section { padding: 18px 16px 0; }
.mv-section-head {
  display: flex; align-items: center; gap: 10px;
  padding-bottom: 10px;
}
.mv-section-num   { font-family: 'JetBrains Mono', monospace; color: var(--ink-3); font-size: 11px; }
.mv-section-title { font-size: 12px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink); }

/* Unit toggle */
.mv-unit-toggle {
  margin-left: auto; display: flex;
  border: 1px solid var(--rule-strong);
}
.mv-unit-toggle button {
  background: transparent; border: none; padding: 4px 8px;
  font: inherit; font-size: 10.5px; font-family: 'JetBrains Mono', monospace;
  color: var(--ink-3); cursor: pointer;
  border-right: 1px solid var(--rule);
}
.mv-unit-toggle button:last-child { border-right: none; }
.mv-unit-toggle button.on { background: var(--ink); color: var(--canvas); }

/* ---------- Selector rows ---------- */
.mv-selector {
  width: 100%;
  display: grid; grid-template-columns: 36px 1fr 16px;
  gap: 10px; align-items: center;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--rule-strong);
  cursor: pointer; text-align: left; font: inherit; color: var(--ink);
  min-height: 56px;
}
.mv-selector:hover { background: var(--hover); }
.mv-sel-icon {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: var(--canvas);
  border: 1px solid var(--rule);
  color: var(--ink-2);
}
.mv-sel-main  { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.mv-sel-title { font-size: 14px; font-weight: 500; color: var(--ink); }
.mv-sel-sub   { font-size: 11px; color: var(--ink-3); }
.mv-chev      { color: var(--ink-3); font-size: 18px; line-height: 1; font-weight: 300; }

.mat-swatch { width: 18px; height: 18px; border: 1px solid var(--rule-strong); }

/* ---------- Dimension grid ---------- */
.mv-dim-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.mv-field { display: flex; flex-direction: column; gap: 6px; }
.mv-field label {
  font-size: 10.5px; color: var(--ink-3);
  text-transform: uppercase; letter-spacing: 0.1em;
}
.mv-optional { text-transform: none; letter-spacing: 0; opacity: 0.7; }
.mv-input {
  display: flex; align-items: center;
  border: 1px solid var(--rule-strong);
  background: var(--input-bg);
  min-height: 44px;
}
.mv-input:focus-within { border-color: var(--accent); }
.mv-input input,
.mv-input select {
  flex: 1; min-width: 0; border: none; background: transparent;
  color: var(--ink); font-family: 'JetBrains Mono', monospace;
  font-size: 15px; padding: 10px 12px; outline: none;
}
.mv-input input[type="text"] { font-family: 'Inter', sans-serif; }
.mv-input select {
  font-family: 'JetBrains Mono', monospace; font-size: 13px;
  border-left: 1px solid var(--rule); padding: 10px 12px;
  background: var(--input-bg); cursor: pointer;
}
.mv-suffix, .mv-prefix {
  padding: 0 12px; color: var(--ink-3);
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  border-left: 1px solid var(--rule);
}
.mv-prefix { border-left: none; border-right: 1px solid var(--rule); }
/* Remove spinners */
.mv-input input[type="number"]::-webkit-outer-spin-button,
.mv-input input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.mv-input input[type="number"] { -moz-appearance: textfield; }

/* ---------- Stepper ---------- */
.mv-stepper-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.mv-stepper { display: flex; flex-direction: column; gap: 6px; }
.mv-stepper label { font-size: 10.5px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.1em; }
.mv-stepper-ctrl {
  display: grid; grid-template-columns: 44px 1fr 44px;
  border: 1px solid var(--rule-strong); background: var(--input-bg);
  min-height: 44px;
}
.mv-stepper-ctrl button {
  background: transparent; border: none; color: var(--ink);
  font-size: 20px; cursor: pointer; font-family: inherit;
  border-right: 1px solid var(--rule);
}
.mv-stepper-ctrl button:last-child { border-right: none; border-left: 1px solid var(--rule); }
.mv-stepper-ctrl button:hover { background: var(--hover); }
.mv-stepper-val { display: flex; align-items: center; justify-content: center; gap: 4px; }
.mv-stepper-val input {
  width: 100%; min-width: 0; border: none; background: transparent;
  color: var(--ink); text-align: center;
  font-family: 'JetBrains Mono', monospace; font-size: 15px;
  outline: none; padding: 0;
}
.mv-stepper-val span {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  color: var(--ink-3); padding-right: 8px;
}

/* ---------- Breakdown card ---------- */
.mv-breakdown {
  margin: 18px 16px 0;
  border: 1px solid var(--rule-strong);
  background: var(--panel);
}
.mv-breakdown-head {
  padding: 10px 14px;
  font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink-3);
  border-bottom: 1px solid var(--rule);
}
.mv-br-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 9px 14px; font-size: 12.5px;
  border-bottom: 1px dashed var(--rule);
}
.mv-br-row:last-child { border-bottom: none; }
.mv-br-row.strong { background: var(--selected); }
.mv-br-row.strong > span:last-child { font-size: 15px; font-weight: 600; }
.mv-br-row.accent > span:last-child { color: var(--accent); }
.mv-br-row > span:first-child { color: var(--ink-2); }

/* ---------- Sticky result bar ---------- */
.mv-sticky {
  flex-shrink: 0;
  display: grid; grid-template-columns: 1fr auto;
  gap: 12px; align-items: center;
  padding: 10px 14px;
  background: var(--panel);
  border-top: 1px solid var(--rule-strong);
  transition: background 0.3s;
}
.mv-sticky.flash { background: color-mix(in oklch, var(--accent) 12%, var(--panel)); }
.mv-sticky-nums {
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center; gap: 10px;
}
.mv-sticky-k { font-size: 9.5px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3); }
.mv-sticky-v { font-size: 17px; font-weight: 600; margin-top: 2px; }
.mv-sticky-div { width: 1px; height: 28px; background: var(--rule-strong); }
.mv-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 16px;
  background: var(--accent); color: white; border: none;
  font: inherit; font-size: 13px; font-weight: 600; letter-spacing: 0.02em;
  cursor: pointer; min-height: 44px;
}
.mv-cta:hover { filter: brightness(1.05); }

/* ---------- Tab bar ---------- */
.mv-tabbar {
  flex-shrink: 0;
  display: grid; grid-template-columns: repeat(4, 1fr);
  background: var(--chrome);
  border-top: 1px solid var(--rule-strong);
  padding-bottom: env(safe-area-inset-bottom, 0);
}
.tab-btn {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 8px 4px 10px;
  background: transparent; border: none; color: var(--ink-3);
  cursor: pointer; font: inherit;
  transition: color 0.15s;
}
.tab-btn.on { color: var(--ink); }
.tab-btn.on .tab-label { color: var(--accent); }
.tab-icon-wrap { position: relative; }
.tab-badge {
  position: absolute; top: -4px; right: -8px;
  background: var(--accent); color: white;
  font-family: 'JetBrains Mono', monospace; font-size: 9px;
  padding: 1px 5px; border-radius: 999px;
  min-width: 16px; text-align: center;
}
.tab-label { font-size: 10px; letter-spacing: 0.02em; }

/* ---------- Bottom sheets ---------- */
.sheet-backdrop {
  position: absolute; inset: 0; z-index: 100;
  background: rgba(0,0,0,0.35);
  display: flex; align-items: flex-end;
  animation: fadeIn 0.2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.sheet-panel {
  width: 100%; background: var(--canvas);
  border-top: 1px solid var(--rule-strong);
  max-height: 85%; display: flex; flex-direction: column;
  animation: slideUp 0.25s ease;
}
@keyframes slideUp { from { transform: translateY(100%); } to { transform: translateY(0); } }
.sheet-grabber {
  width: 36px; height: 4px; background: var(--rule-strong);
  border-radius: 2px; margin: 8px auto 0;
}
.sheet-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px; border-bottom: 1px solid var(--rule);
}
.sheet-title { font-size: 13px; font-weight: 600; letter-spacing: 0.04em; color: var(--ink); }
.sheet-close {
  background: none; border: none; color: var(--accent);
  font: inherit; font-size: 13px; font-weight: 600; cursor: pointer;
}
.sheet-scroll { overflow-y: auto; flex: 1; }
.sheet-body { padding: 12px 16px 20px; }
.sheet-group { margin-bottom: 18px; }
.sheet-group-title {
  font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink-3); margin-bottom: 8px;
}

/* Shape picker grid */
.sheet-shape-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.sheet-shape {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 12px 8px;
  background: var(--panel); border: 1px solid var(--rule-strong);
  color: var(--ink-2); cursor: pointer; font: inherit;
  min-height: 88px; position: relative;
}
.sheet-shape:hover { background: var(--hover); }
.sheet-shape.on { background: var(--selected); border-color: var(--ink); color: var(--ink); }
.sheet-shape-icon { color: var(--ink-2); }
.sheet-shape.on .sheet-shape-icon { color: var(--ink); }
.sheet-shape-name { font-size: 10.5px; text-align: center; line-height: 1.2; font-weight: 500; }
.sheet-shape-badge {
  position: absolute; top: 4px; right: 4px;
  font-size: 8.5px; font-family: 'JetBrains Mono', monospace;
  color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.06em;
}

/* Material list */
.mat-list { display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--rule-strong); }
.mat-list-row {
  display: grid; grid-template-columns: 32px 1fr auto; gap: 12px;
  padding: 12px 14px; background: transparent; border: none;
  border-bottom: 1px solid var(--rule);
  color: var(--ink); cursor: pointer; text-align: left; font: inherit;
  min-height: 56px; align-items: center;
}
.mat-list-row:last-child { border-bottom: none; }
.mat-list-row:hover { background: var(--hover); }
.mat-list-row.on { color: var(--accent); }
.mat-list-row.on .mat-list-name { font-weight: 600; }
.mat-swatch-lg { width: 32px; height: 32px; border: 1px solid var(--rule-strong); }
.mat-list-main { display: flex; flex-direction: column; gap: 2px; }
.mat-list-name { font-size: 14px; color: var(--ink); }
.mat-list-rho  { font-size: 11px; color: var(--ink-3); }

/* Unit converter */
.conv-block { margin-bottom: 18px; }
.conv-mobile {
  display: grid; grid-template-columns: 1fr 18px 1fr;
  gap: 8px; align-items: center;
}
.conv-mobile .mv-input input.accent { color: var(--accent); font-weight: 600; }
.conv-eq { text-align: center; color: var(--ink-3); font-family: 'JetBrains Mono', monospace; font-size: 15px; }

/* ---------- Estimate (cart) tab ---------- */
.cart-tab { padding: 8px 0 16px; }
.cart-tab-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  padding: 12px 16px 10px;
  border-bottom: 1px solid var(--rule-strong);
}
.cart-tab-title { font-size: 20px; font-weight: 700; color: var(--ink); letter-spacing: -0.01em; }
.cart-tab-sub   { font-size: 11px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.1em; margin-top: 3px; }
.link-btn {
  background: none; border: none; color: var(--ink-3);
  font: inherit; font-size: 11px; cursor: pointer;
  text-transform: uppercase; letter-spacing: 0.1em; padding: 4px 2px;
}
.link-btn:hover { color: var(--ink); }

.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 60px 24px; text-align: center; gap: 6px;
}
.empty-mark  { font-size: 48px; color: var(--rule-strong); font-family: 'JetBrains Mono', monospace; margin-bottom: 12px; line-height: 1; }
.empty-title { font-size: 15px; color: var(--ink); font-weight: 500; }
.empty-sub   { font-size: 12px; color: var(--ink-3); max-width: 240px; line-height: 1.5; }

.cart-m-list { display: flex; flex-direction: column; background: var(--panel); border-bottom: 1px solid var(--rule-strong); }
.cart-m-row {
  display: grid; grid-template-columns: 28px 1fr auto;
  gap: 10px; padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  align-items: flex-start;
}
.cart-m-row:last-child { border-bottom: none; }
.cart-m-num   { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--ink-3); padding-top: 2px; }
.cart-m-body  { min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.cart-m-title { display: flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 500; color: var(--ink); }
.cart-m-title span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cart-m-meta  { font-size: 10.5px; color: var(--ink-3); }
.cart-m-nums  { display: flex; gap: 12px; font-size: 12px; margin-top: 2px; }
.cart-m-actions { display: flex; flex-direction: column; gap: 4px; }
.cart-m-actions button {
  width: 28px; height: 28px; background: transparent;
  border: 1px solid transparent; color: var(--ink-3);
  cursor: pointer; font-size: 14px; line-height: 1;
}
.cart-m-actions button:hover { border-color: var(--rule-strong); color: var(--ink); }
.cart-m-actions button.danger:hover { color: var(--danger); border-color: var(--danger); }

.cart-m-totals { padding: 16px; background: var(--panel); border-top: 2px solid var(--ink); }
.tot-m-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 6px 0; font-size: 12.5px;
}
.tot-m-row.big {
  padding-top: 10px; margin-top: 6px;
  border-top: 1px dashed var(--rule);
  font-size: 14px;
}
.tot-m-row.big .mono { font-size: 20px; }
.cart-m-btn-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 14px; }
.mv-btn-secondary {
  background: transparent; border: 1px solid var(--rule-strong);
  color: var(--ink); font: inherit; font-size: 12px;
  padding: 10px 12px; cursor: pointer; min-height: 40px;
}
.mv-btn-secondary:hover { background: var(--hover); }

/* ---------- History tab ---------- */
.hist-m-list { display: flex; flex-direction: column; background: var(--panel); }
.hist-m-row {
  display: grid; grid-template-columns: 24px 1fr auto;
  gap: 10px; padding: 12px 16px; align-items: center;
  background: transparent; border: none;
  border-bottom: 1px solid var(--rule);
  cursor: pointer; font: inherit; text-align: left; color: var(--ink);
}
.hist-m-row:hover { background: var(--hover); }
.hist-m-icon  { color: var(--ink-3); }
.hist-m-body  { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.hist-m-title { font-size: 13px; color: var(--ink); font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hist-m-meta  { font-size: 10.5px; color: var(--ink-3); }
.hist-m-time  { font-size: 10.5px; color: var(--ink-3); }

/* ---------- More tab ---------- */
.more-tab { padding: 8px 0 16px; }
.more-section { padding: 12px 16px 0; }
.more-section-title {
  font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink-3); margin-bottom: 8px; padding-left: 2px;
}
.more-row {
  width: 100%;
  display: grid; grid-template-columns: 32px 1fr 16px; gap: 12px;
  padding: 12px 14px; background: var(--panel); border: 1px solid var(--rule-strong);
  border-bottom: none;
  align-items: center;
  cursor: pointer; text-align: left; font: inherit; color: var(--ink);
  min-height: 52px;
}
.more-row:last-child { border-bottom: 1px solid var(--rule-strong); }
.more-row:hover { background: var(--hover); }
.more-row-icon { width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid var(--rule); color: var(--ink-2); }
.more-row-main { display: flex; flex-direction: column; gap: 2px; }
.more-row-main > span:first-child { font-size: 14px; color: var(--ink); }
.more-row-main small { font-size: 11px; color: var(--ink-3); }

.about-card {
  padding: 18px 16px; background: var(--panel);
  border: 1px solid var(--rule-strong);
  display: flex; flex-direction: column; gap: 6px;
}
.about-name  { font-weight: 700; letter-spacing: 0.16em; font-size: 13px; color: var(--ink); }
.about-sub   { font-size: 12px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.1em; }
.about-notes { font-size: 10.5px; color: var(--ink-3); margin-top: 2px; }
.about-text  { font-size: 12.5px; color: var(--ink-2); line-height: 1.5; margin-top: 8px; }

/* ---------- Tweaks / display settings ---------- */
.tweaks-panel {
  position: fixed; bottom: 16px; right: 16px; width: 260px;
  background: var(--panel); border: 1px solid var(--rule-strong); z-index: 200;
  box-shadow: 0 12px 30px rgba(0,0,0,0.18);
}
.tp-head { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; border-bottom: 1px solid var(--rule); font-size: 12px; font-weight: 600; }
.tp-body { padding: 12px 14px; display: flex; flex-direction: column; gap: 12px; }
.tp-field { display: flex; flex-direction: column; gap: 6px; }
.tp-label { font-size: 10px; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.14em; }
.tp-opts, .tw-opts { display: flex; flex-wrap: wrap; gap: 6px; }
.tw-opt {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 10px; border: 1px solid var(--rule-strong); background: var(--panel);
  cursor: pointer; font: inherit; font-size: 11.5px; color: var(--ink-2); text-transform: capitalize;
}
.tw-opt:hover { background: var(--hover); }
.tw-opt.on { border-color: var(--ink); color: var(--ink); background: var(--selected); }
.tw-sw { width: 12px; height: 12px; border: 1px solid var(--rule-strong); display: inline-block; }
.tw-sw-light     { background: #FAFAF7; }
.tw-sw-blueprint { background: #0C1824; }
.tw-sw-paper     { background: #F5EFE4; }
.icon-btn {
  background: none; border: 1px solid var(--rule); width: 24px; height: 24px;
  display: grid; place-items: center; cursor: pointer; color: var(--ink); font-size: 16px;
}

/* ---------- calc-tab convenience wrapper ---------- */
.calc-tab {}