/* ============================================================
   Surface Engineering Handbook - Styles
   Clean, professional, responsive, light theme
   ============================================================ */
:root {
  --c-primary: #1f5f8b;
  --c-primary-dark: #15405e;
  --c-accent: #e08a1e;
  --c-bg: #f4f6f9;
  --c-surface: #ffffff;
  --c-border: #dfe5ec;
  --c-text: #1f2a36;
  --c-text-soft: #5a6b7b;
  --c-sidebar: #14304a;
  --c-sidebar-text: #cfe0ee;
  --c-sidebar-active: #1f5f8b;
  --shadow: 0 1px 3px rgba(20, 48, 74, .08), 0 6px 18px rgba(20, 48, 74, .06);
  --radius: 10px;
  --maxw: 1180px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "Microsoft YaHei", "PingFang SC", Roboto, Helvetica, Arial, sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.65;
  font-size: 15px;
}

/* ===== Top bar ===== */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  height: 58px; padding: 0 16px;
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.12);
}
.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.brand { display: flex; align-items: center; gap: 9px; text-decoration: none; color: #fff; font-weight: 700; }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--c-accent); color: #fff; font-weight: 800; font-size: 14px;
}
.brand-text { font-size: 16px; letter-spacing: .3px; }
.icon-btn {
  background: rgba(255,255,255,.12); border: none; color: #fff;
  width: 38px; height: 38px; border-radius: 8px; font-size: 18px; cursor: pointer;
}
.icon-btn:hover { background: rgba(255,255,255,.22); }

.top-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 13px; border-radius: 8px;
  background: rgba(255,255,255,.14); color: #fff; text-decoration: none;
  font-size: 13.5px; font-weight: 600; white-space: nowrap;
}
.top-btn:hover { background: rgba(255,255,255,.26); }
.top-btn .ic { font-size: 15px; }

.lang-wrap select {
  appearance: none; -webkit-appearance: none;
  background: rgba(255,255,255,.14) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6'><path d='M0 0l5 6 5-6z' fill='white'/></svg>") no-repeat right 10px center;
  border: none; color: #fff; padding: 8px 30px 8px 12px; border-radius: 8px;
  font-size: 13.5px; font-weight: 600; cursor: pointer;
}
.lang-wrap select option { color: #1f2a36; }

/* ===== Layout ===== */
.layout { display: flex; align-items: flex-start; min-height: calc(100vh - 58px - 46px); }
.sidebar {
  width: 290px; flex: 0 0 290px;
  background: var(--c-sidebar); color: var(--c-sidebar-text);
  position: sticky; top: 58px; height: calc(100vh - 58px - 46px);
  overflow-y: auto; padding: 14px 10px;
}
.search-box { position: relative; margin-bottom: 12px; }
.search-box input {
  width: 100%; padding: 9px 30px 9px 32px; border-radius: 8px;
  border: 1px solid rgba(255,255,255,.15); background: rgba(255,255,255,.08);
  color: #fff; font-size: 13.5px;
}
.search-box input::placeholder { color: rgba(255,255,255,.6); }
.search-ic { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); opacity: .7; }

.module-nav .m-group { margin-bottom: 6px; }
.m-link {
  display: flex; align-items: center; gap: 9px; width: 100%;
  padding: 9px 11px; border-radius: 8px; cursor: pointer;
  color: var(--c-sidebar-text); text-decoration: none; font-size: 14px;
  border: none; background: none; text-align: left;
}
.m-link:hover { background: rgba(255,255,255,.08); }
.m-link.active { background: var(--c-sidebar-active); color: #fff; font-weight: 600; }
.m-ico { width: 22px; text-align: center; font-size: 16px; flex: 0 0 22px; }
.m-count { margin-left: auto; font-size: 11px; opacity: .6; background: rgba(255,255,255,.1); padding: 1px 7px; border-radius: 10px; }

.sub-nav { margin: 2px 0 4px 30px; border-left: 1px solid rgba(255,255,255,.12); }
.sub-link {
  display: block; padding: 6px 10px; border-radius: 6px; cursor: pointer;
  color: rgba(207,224,238,.85); text-decoration: none; font-size: 13px;
  border: none; background: none; width: 100%; text-align: left;
}
.sub-link:hover { background: rgba(255,255,255,.07); color: #fff; }
.sub-link.active { color: #fff; font-weight: 600; background: rgba(31,95,139,.5); }

/* ===== Content ===== */
.content { flex: 1 1 auto; padding: 26px 30px 50px; min-width: 0; }
.content-inner { max-width: var(--maxw); margin: 0 auto; }

.breadcrumb { font-size: 13px; color: var(--c-text-soft); margin-bottom: 10px; }
.breadcrumb a { color: var(--c-primary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

.page-title { font-size: 27px; font-weight: 800; margin: 4px 0 6px; color: var(--c-primary-dark); }
.page-sub { color: var(--c-text-soft); font-size: 14.5px; margin-bottom: 18px; }

.module-intro {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-accent); border-radius: var(--radius);
  padding: 16px 20px; box-shadow: var(--shadow); margin-bottom: 22px;
}

/* technique cards / sections */
.tech-card {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 26px;
  overflow: hidden; scroll-margin-top: 70px;
}
.tech-head {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 20px; background: linear-gradient(90deg, #eef4fa, #fff);
  border-bottom: 1px solid var(--c-border);
}
.tech-head h3 { margin: 0; font-size: 19px; color: var(--c-primary-dark); }
.tech-badge { font-size: 11px; background: var(--c-primary); color: #fff; padding: 2px 9px; border-radius: 20px; }
.tech-body { padding: 6px 20px 18px; }

.section {
  padding: 14px 0; border-bottom: 1px dashed var(--c-border);
}
.section:last-child { border-bottom: none; }
.section-head {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; color: var(--c-primary); font-size: 15.5px; margin-bottom: 8px;
}
.section-head .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--c-accent); }
.section p { margin: 6px 0; }

ul.flist { margin: 6px 0; padding-left: 20px; }
ul.flist li { margin: 4px 0; }
ul.flist li b { color: var(--c-primary-dark); }

/* tables */
.tbl-wrap { overflow-x: auto; margin: 10px 0; }
table.data {
  border-collapse: collapse; width: 100%; font-size: 13.5px; background: #fff;
}
table.data th, table.data td {
  border: 1px solid var(--c-border); padding: 8px 11px; text-align: left; vertical-align: top;
}
table.data th { background: var(--c-primary); color: #fff; font-weight: 600; }
table.data tr:nth-child(even) td { background: #f7fafc; }
table.data td.k { font-weight: 600; color: var(--c-primary-dark); white-space: nowrap; }

/* diagrams */
.diagram-wrap {
  margin: 14px 0; background: #fbfdff; border: 1px solid var(--c-border);
  border-radius: 8px; padding: 12px; text-align: center;
}
.diagram-wrap svg { max-width: 100%; height: auto; }
.diagram-cap { font-size: 12.5px; color: var(--c-text-soft); margin-top: 6px; }

.callout {
  display: flex; gap: 10px; padding: 11px 14px; border-radius: 8px;
  font-size: 13.5px; margin: 12px 0;
}
.callout.tip { background: #eaf6ee; border: 1px solid #bfe3cb; color: #1d5b34; }
.callout.warn { background: #fdf0e3; border: 1px solid #f3cfa8; color: #8a4b12; }
.callout .ci { font-size: 16px; }

/* home / index grid */
.home-hero {
  background: linear-gradient(120deg, var(--c-primary), var(--c-primary-dark));
  color: #fff; border-radius: var(--radius); padding: 30px 34px; margin-bottom: 26px;
  box-shadow: var(--shadow);
}
.home-hero h1 { margin: 0 0 8px; font-size: 30px; }
.home-hero p { margin: 0; opacity: .92; max-width: 720px; }
.home-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.home-card {
  background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 18px 20px; box-shadow: var(--shadow); cursor: pointer; transition: transform .12s, box-shadow .12s;
  text-decoration: none; color: inherit; display: block;
}
.home-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(20,48,74,.14); border-color: var(--c-primary); }
.home-card .hc-ico { font-size: 28px; }
.home-card h3 { margin: 8px 0 4px; font-size: 17px; color: var(--c-primary-dark); }
.home-card p { margin: 0; font-size: 13px; color: var(--c-text-soft); }
.home-card .hc-tags { margin-top: 8px; font-size: 11.5px; color: var(--c-primary); }

/* search results */
.result-item {
  background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 8px;
  padding: 12px 16px; margin-bottom: 10px; box-shadow: var(--shadow);
}
.result-item a { font-weight: 600; color: var(--c-primary); text-decoration: none; }
.result-item .snippet { font-size: 13px; color: var(--c-text-soft); margin-top: 4px; }
mark { background: #ffe9a8; padding: 0 2px; border-radius: 3px; }

/* footer */
.site-footer {
  text-align: center; padding: 14px; font-size: 12.5px; color: var(--c-text-soft);
  background: var(--c-surface); border-top: 1px solid var(--c-border);
}
.site-footer a { color: var(--c-primary); text-decoration: none; }
.site-footer .sep { margin: 0 8px; opacity: .5; }

/* overlay for mobile */
.overlay { display: none; position: fixed; inset: 58px 0 0 0; background: rgba(0,0,0,.4); z-index: 40; }
body.sb-open .overlay { display: block; }

/* responsive */
@media (max-width: 860px) {
  .sidebar {
    position: fixed; left: 0; top: 58px; z-index: 45;
    transform: translateX(-100%); transition: transform .22s ease;
    height: calc(100vh - 58px); width: 280px;
  }
  body.sb-open .sidebar { transform: translateX(0); }
  .content { padding: 18px 16px 40px; }
  .brand-text { display: none; }
  .top-btn span:not(.ic) { display: none; }
  .top-btn { padding: 8px 10px; }
}
@media (max-width: 520px) {
  .page-title { font-size: 22px; }
  .home-hero { padding: 22px; }
}

/* ===== Tools: calculators / compare / picker ===== */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; margin: 4px 0 26px; }
.tool-card { display: block; border: 1px solid var(--c-border, #d9e2ea); border-radius: 14px; padding: 16px; background: #fff; text-decoration: none; transition: transform .15s, box-shadow .15s; }
.tool-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(20,48,74,.14); border-color: var(--c-primary); }
.tool-card .tc-ico { font-size: 26px; }
.tool-card h3 { margin: 8px 0 4px; font-size: 16px; color: var(--c-primary-dark); }
.tool-card p { margin: 0; font-size: 12.5px; color: var(--c-text-soft); }

.calc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; margin-top: 10px; }
.calc-card { border: 1px solid var(--c-border, #d9e2ea); border-radius: 14px; padding: 16px 18px; background: #fff; }
.calc-card h3 { margin: 0 0 12px; font-size: 15.5px; color: var(--c-primary-dark); }
.calc-wide { grid-column: 1 / -1; }
.calc-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.calc-row label { font-size: 13px; color: var(--c-text-soft); }
.calc-row input, .calc-row select { width: 150px; padding: 6px 9px; border: 1px solid #ccd7e0; border-radius: 8px; font-size: 13.5px; color: #233746; background: #fff; }
.calc-out { margin-top: 4px; padding: 10px 12px; border-radius: 10px; background: #eef4fa; color: var(--c-primary-dark); font-size: 14px; font-weight: 500; }
.calc-note { margin: 14px 0 0; font-size: 12px; color: var(--c-text-soft); }

.compare-pick { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 12px 0; padding: 14px 16px; border: 1px dashed var(--c-border, #cbd7e1); border-radius: 12px; background: #fbfdff; }
.compare-pick > span { font-size: 13.5px; color: var(--c-text-soft); }
.cmp-group { width: 100%; margin-top: 6px; font-size: 12px; font-weight: 500; color: var(--c-primary); text-transform: uppercase; letter-spacing: .04em; }
.cmp-item { display: inline-flex; align-items: center; gap: 5px; margin: 3px 12px 3px 0; font-size: 13px; color: #233746; cursor: pointer; }
.btn { padding: 9px 18px; border: 0; border-radius: 9px; background: var(--c-primary); color: #fff; font-size: 14px; cursor: pointer; }
.btn:hover { opacity: .9; }
.compare-res { margin-top: 8px; }
.cmp-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 18px; }
.cmp-card { border: 1px solid var(--c-border, #d9e2ea); border-radius: 14px; padding: 16px; background: #fff; }
.cmp-card .diagram-wrap { margin-bottom: 10px; }
.cmp-title { font-size: 16px; font-weight: 500; color: var(--c-primary-dark); text-decoration: none; }
.cmp-title:hover { text-decoration: underline; }
.cmp-mod { font-size: 12px; color: var(--c-text-soft); margin-bottom: 10px; }
.cmp-tbl { margin-top: 8px; }
.cmp-tbl td { font-size: 12.5px; }
.cost-bar { display: inline-block; width: 54px; height: 7px; border-radius: 4px; background: #e3ebf2; vertical-align: middle; margin-right: 6px; overflow: hidden; }
.cost-bar i { display: block; height: 100%; background: var(--c-primary); }
.chip { display: inline-block; margin: 2px 4px 2px 0; padding: 2px 9px; border-radius: 20px; background: #eef4fa; color: var(--c-primary-dark); font-size: 11.5px; }

.picker-form { margin: 12px 0; padding: 16px 18px; border: 1px dashed var(--c-border, #cbd7e1); border-radius: 12px; background: #fbfdff; }
.picker-form .calc-row { max-width: 420px; }
.picker-needs { align-items: flex-start; }
.picker-needs > div { flex: 1; }
.pick-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; margin-top: 6px; }
.pick-card { display: block; border: 1px solid var(--c-border, #d9e2ea); border-radius: 14px; padding: 14px 16px; background: #fff; text-decoration: none; transition: transform .15s, box-shadow .15s; }
.pick-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(20,48,74,.14); border-color: var(--c-primary); }
.pick-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.pick-head b { font-size: 15px; color: var(--c-primary-dark); }
.pick-mod { font-size: 11.5px; color: var(--c-text-soft); }
.pick-tags { margin: 8px 0 6px; }
.pick-meta { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 12px; color: var(--c-text-soft); }

/* ===== Dark mode ===== */
body.dark {
  --c-primary: #4f9ed0;
  --c-primary-dark: #8fc3e8;
  --c-accent: #f0a94e;
  --c-bg: #111920;
  --c-surface: #1a2632;
  --c-border: #2b3a49;
  --c-text: #d6e2ee;
  --c-text-soft: #93a6b8;
  --c-sidebar: #0c141c;
  --c-sidebar-text: #c9dcec;
  --c-sidebar-active: #1f5f8b;
  --shadow: 0 1px 3px rgba(0,0,0,.45), 0 6px 18px rgba(0,0,0,.35);
}
body.dark .tech-head { background: linear-gradient(90deg, #1c2c3a, #1a2632); }
body.dark table.data { background: #1a2632; }
body.dark table.data tr:nth-child(even) td { background: #1e2c3a; }
body.dark table.data td.k { color: #8fc3e8; }
body.dark .diagram-wrap { background: #16222e; }
body.dark .callout.tip { background: #173027; border-color: #2a5c44; color: #9fdcb8; }
body.dark .callout.warn { background: #33271a; border-color: #6e4c26; color: #f2c98a; }
body.dark mark { background: #6e5a24; color: #ffe9a8; }
body.dark .tool-card, body.dark .calc-card, body.dark .cmp-card, body.dark .pick-card,
body.dark .result-item { background: #1a2632; }
body.dark .calc-out { background: #1c2c3a; color: #8fc3e8; }
body.dark .compare-pick, body.dark .picker-form { background: #141f2a; }
body.dark .calc-row input, body.dark .calc-row select { background: #1a2632; border-color: #3a4d5f; color: #d6e2ee; }
body.dark .chip { background: #1c2c3a; color: #8fc3e8; }
body.dark .cost-bar { background: #2b3a49; }
body.dark .home-card:hover, body.dark .tool-card:hover, body.dark .pick-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,.55); }
body.dark .cmp-item { color: #d6e2ee; }
body.dark .pick-mod, body.dark .cmp-mod { color: #93a6b8; }

/* dark mode: inline SVG diagrams */
body.dark .diagram-wrap svg text { fill: #d6e2ee; }
body.dark .diagram-wrap svg text[fill="#6b8194"] { fill: #93a6b8; }
body.dark .diagram-wrap svg rect[fill="#eef4fa"] { fill: #1e2e3d; }
body.dark .diagram-wrap svg rect[fill="#fff"] { fill: #16222e; }
body.dark .diagram-wrap svg rect[fill="#fbfdff"] { fill: #16222e; }
body.dark .diagram-wrap svg rect[fill="#cdd6de"] { fill: #2b3a49; }
body.dark .diagram-wrap svg line[stroke="#eef3f7"] { stroke: #223242; }
body.dark .diagram-wrap svg line[stroke="#d6e1ea"] { stroke: #2b3a49; }
body.dark .diagram-wrap svg line[stroke="#9fb4c4"] { stroke: #93a6b8; }
body.dark .diagram-wrap svg line[stroke="#9fb0bd"] { stroke: #93a6b8; }
body.dark .diagram-wrap svg line[stroke="#e3ecf3"] { stroke: #223242; }
body.dark .diagram-wrap svg circle[stroke="#e3ecf3"] { stroke: #223242; }
body.dark .diagram-wrap svg circle[fill="#1f5f8b"] { fill: #4f9ed0; }
body.dark .diagram-wrap svg circle[fill="#e08a1e"] { fill: #f0a94e; }
body.dark .diagram-wrap svg polygon[fill="#e08a1e"] { fill: #f0a94e; }
body.dark .diagram-wrap svg path[stroke="#e08a1e"] { stroke: #f0a94e; }
body.dark .diagram-wrap svg line[stroke="#e08a1e"] { stroke: #f0a94e; }
body.dark .diagram-wrap svg polyline[stroke="#e08a1e"] { stroke: #f0a94e; }

/* ===== Mobile polish ===== */
@media (max-width: 860px) {
  .content { padding: 20px 18px 40px; }
}
@media (max-width: 620px) {
  .content { padding: 16px 13px 40px; }
  .top-btn span:not(.ic) { display: none; }
  .top-btn { padding: 8px 10px; }
  .brand-text { font-size: 14px; }
  .calc-row { flex-direction: column; align-items: stretch; }
  .calc-row input, .calc-row select { width: 100%; }
  .calc-grid { grid-template-columns: 1fr; }
  .cmp-grid, .pick-grid { grid-template-columns: 1fr; }
  .diagram-wrap { padding: 8px; overflow-x: auto; }
  .diagram-wrap svg { min-width: 320px; }
  .home-hero { padding: 22px 20px; }
  .home-hero h1 { font-size: 24px; }
  .tech-head { padding: 12px 14px; }
  .tech-body { padding: 4px 14px 14px; }
  .section-head { font-size: 14.5px; }
  .page-title { font-size: 23px; }
  .compare-pick { flex-direction: column; align-items: flex-start; }
  .picker-form .calc-row { max-width: none; }
}

/* ===== Print / PDF export ===== */
@media print {
  body { background: #fff !important; color: #1f2a36; }
  body.dark {
    --c-primary: #1f5f8b; --c-primary-dark: #15405e; --c-accent: #e08a1e;
    --c-bg: #fff; --c-surface: #fff; --c-border: #dfe5ec;
    --c-text: #1f2a36; --c-text-soft: #5a6b7b;
  }
  .topbar, .sidebar, .site-footer, .overlay, .tool-grid,
  .compare-pick, .picker-form, .btn, .theme-btn, .print-btn { display: none !important; }
  .layout { display: block; }
  .content { padding: 0; }
  .content-inner { max-width: 100%; }
  .home-hero, .module-intro, .tech-card, .calc-card, .cmp-card, .pick-card,
  .result-item, .callout, table.data, .diagram-wrap { break-inside: avoid; }
  .tech-card { box-shadow: none; border-color: #ccd7e0; }
  .section { page-break-after: auto; }
  .calc-grid { display: block; }
  .calc-card { margin-bottom: 14px; }
  .calc-row input, .calc-row select { border: 1px solid #ccd7e0; }
  .calc-out { background: #eef4fa; color: #15405e; }

  /* revert inline-SVG dark overrides for print */
  body.dark .diagram-wrap { background: #fbfdff; }
  body.dark .diagram-wrap svg text { fill: #15405e; }
  body.dark .diagram-wrap svg text[fill="#93a6b8"] { fill: #6b8194; }
  body.dark .diagram-wrap svg rect[fill="#1e2e3d"] { fill: #eef4fa; }
  body.dark .diagram-wrap svg rect[fill="#16222e"] { fill: #fbfdff; }
  body.dark .diagram-wrap svg rect[fill="#2b3a49"] { fill: #cdd6de; }
  body.dark .diagram-wrap svg line[stroke="#223242"] { stroke: #eef3f7; }
  body.dark .diagram-wrap svg line[stroke="#2b3a49"] { stroke: #d6e1ea; }
  body.dark .diagram-wrap svg line[stroke="#93a6b8"] { stroke: #9fb4c4; }
  body.dark .diagram-wrap svg circle[fill="#4f9ed0"] { fill: #1f5f8b; }
  body.dark .diagram-wrap svg circle[fill="#f0a94e"] { fill: #e08a1e; }
  body.dark .diagram-wrap svg polygon[fill="#f0a94e"] { fill: #e08a1e; }
  body.dark .diagram-wrap svg path[stroke="#f0a94e"] { stroke: #e08a1e; }
  body.dark .diagram-wrap svg line[stroke="#f0a94e"] { stroke: #e08a1e; }
  body.dark .diagram-wrap svg polyline[stroke="#f0a94e"] { stroke: #e08a1e; }
  body.dark .calc-out { background: #eef4fa; color: #15405e; }
  body.dark table.data { background: #fff; }
  body.dark table.data tr:nth-child(even) td { background: #f7fafc; }
  body.dark .tech-head { background: #eef4fa; }
  body.dark .callout.tip { background: #eaf6ee; border-color: #bfe3cb; color: #1d5b34; }
  body.dark .callout.warn { background: #fdf0e3; border-color: #f3cfa8; color: #8a4b12; }
  body.dark .chip { background: #eef4fa; color: #15405e; }
  body.dark .diagram-cap { color: #5a6b7b; }
}