:root {
  --cream: #f5e6d3;
  --white: #fffaf2;
  --paper: #fff9ef;
  --field: #fffdf7;
  --ink: #2c2416;
  --muted: #6b5d4f;
  --orange: #d97642;
  --mustard: #d4a574;
  --olive: #4a7c59;
  --blue: #7d9ba8;
  --line: rgba(44, 36, 22, 0.14);
  --line-strong: rgba(44, 36, 22, 0.28);
  --shadow: 0 10px 28px rgba(44, 36, 22, 0.08);
  --font-display: "Avenir Next", "Century Gothic", "Futura", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --font-body: "Avenir Next", "PingFang SC", "Noto Sans SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --font-number: "Bahnschrift", "DIN Alternate", "Segoe UI", "Microsoft YaHei UI", sans-serif;
  --font-mono: "Cascadia Mono", "JetBrains Mono", "Consolas", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 16% 10%, rgba(212, 165, 116, 0.2), transparent 24%),
    linear-gradient(180deg, #f7ead9 0%, #f3e4d0 52%, #ead9c0 100%);
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

body.tools-directory {
  display: flex;
  flex-direction: column;
}

body.tools-directory .topbar,
body.tools-directory .footer {
  flex: 0 0 auto;
}

body.tools-directory .directory-shell {
  flex: 1 0 auto;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Ccircle cx='2' cy='2' r='1.2' fill='%238b7355'/%3E%3C/svg%3E");
  background-size: 24px 24px;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

.topbar {
  height: 58px;
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 230, 211, 0.94);
  backdrop-filter: blur(10px);
}

.topbar-inner {
  width: min(1840px, calc(100% - 48px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  position: relative;
  background: var(--orange);
  box-shadow: inset 0 0 0 8px var(--white);
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  background: var(--ink);
}

.brand-mark::before {
  width: 16px;
  height: 2px;
  left: 8px;
  top: 15px;
}

.brand-mark::after {
  width: 2px;
  height: 16px;
  left: 15px;
  top: 8px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.nav a {
  border-radius: 999px;
  padding: 8px 12px;
  transition: background 180ms ease, color 180ms ease;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--white);
  background: var(--olive);
}

.directory-shell,
.tool-shell {
  width: min(1840px, calc(100% - 48px));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.directory-shell {
  padding: 38px 0 48px;
}

.directory-hero {
  padding: 8px 0 24px;
}

.kicker {
  color: var(--olive);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  letter-spacing: 0;
}

h1 {
  max-width: 780px;
  margin: 12px 0 0;
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1.08;
  font-weight: 700;
}

.lead {
  max-width: 780px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: clamp(14px, 1.25vw, 17px);
  line-height: 1.88;
}

.directory-note {
  padding: 14px 18px;
  border-left: 4px solid var(--orange);
  border-radius: 0 12px 12px 0;
  color: var(--muted);
  background: rgba(255, 250, 242, 0.55);
  font-size: 13px;
  line-height: 1.7;
  margin-bottom: 28px;
}

.tool-section {
  margin-top: 28px;
}

.tool-section + .tool-section {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.section-head h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.2;
  font-weight: 700;
}

.section-head span {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 14px;
}

.tool-card {
  min-height: 200px;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: var(--ink);
  background: rgba(255, 250, 242, 0.88);
  box-shadow: var(--shadow);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.tool-card:hover {
  transform: translateY(-3px);
  border-color: rgba(74, 124, 89, 0.42);
  box-shadow: 0 14px 36px rgba(44, 36, 22, 0.1);
}

.tool-card.is-soon {
  opacity: 0.72;
}

.tool-card.is-soon .tool-link::after {
  content: "";
}

.tool-card-top {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.tool-icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--cream);
  border: 1px solid rgba(44, 36, 22, 0.42);
  position: relative;
  flex: 0 0 auto;
  overflow: hidden;
}

.tool-icon svg {
  width: 22px;
  height: 22px;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.pcb-card .tool-icon svg {
  stroke: var(--olive);
}

.power-card .tool-icon svg {
  stroke: var(--orange);
}

.pcb-card {
  border-left: 3px solid var(--olive);
}

.pcb-card .kicker {
  color: var(--olive);
}

.power-card {
  border-left: 3px solid var(--orange);
}

.power-card .kicker {
  color: var(--orange);
}

.tool-card h3 {
  margin: 16px 0 8px;
  font-size: 22px;
  line-height: 1.22;
  font-weight: 700;
}

.tool-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.tool-link {
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-weight: 700;
}

.tool-link::after {
  content: "→";
  color: var(--orange);
}

.tool-shell {
  min-height: calc(100vh - 58px);
  padding: 14px 0;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 16px;
}

.sidebar,
.tool-panel {
  border: 1px solid var(--line);
  background: rgba(255, 250, 242, 0.92);
  box-shadow: var(--shadow);
}

.sidebar {
  border-radius: 18px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sidebar h1 {
  margin: 0;
  font-size: 25px;
  line-height: 1.16;
  font-weight: 700;
}

.side-copy {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.72;
}

.tool-menu {
  display: grid;
  gap: 9px;
  margin-top: 2px;
}

.tool-tab {
  min-height: 66px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  align-items: center;
  background: var(--paper);
  color: var(--ink);
}

.tool-tab[aria-current="page"] {
  color: var(--white);
  background: linear-gradient(135deg, #2e3f31, #263020);
  border-color: rgba(44, 36, 22, 0.26);
}

.tool-tab[aria-current="page"] .tool-icon {
  background: var(--mustard);
}

.tool-tab .tool-icon {
  width: 34px;
  height: 34px;
}

.tool-tab .tool-icon svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
}

.tool-tab[aria-current="page"] .tool-icon svg {
  stroke: var(--white);
}

.tab-title {
  display: block;
  font-weight: 700;
  line-height: 1.2;
}

.tab-desc {
  display: block;
  margin-top: 4px;
  color: currentColor;
  opacity: 0.68;
  font-size: 11px;
  line-height: 1.35;
}

.side-note {
  margin-top: auto;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.68;
}

.side-note a {
  border-bottom: 1px solid rgba(107, 93, 79, 0.42);
}

.tool-panel {
  min-width: 0;
  min-height: 0;
  border-radius: 18px;
  overflow: hidden;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

[data-category="pcb"] {
  --cat: var(--olive);
  --cat-bg: rgba(74, 124, 89, 0.07);
  --cat-focus: rgba(74, 124, 89, 0.14);
}

[data-category="power"] {
  --cat: var(--orange);
  --cat-bg: rgba(217, 118, 66, 0.07);
  --cat-focus: rgba(217, 118, 66, 0.14);
}

[data-category] .sidebar .kicker {
  color: var(--cat);
}

.tool-top {
  min-height: 82px;
  padding: 17px 22px;
  border-bottom: 1px solid var(--line);
  border-top: 3px solid var(--cat, var(--olive));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.tool-top h2 {
  margin: 0;
  font-size: 28px;
  line-height: 1.18;
  font-weight: 700;
}

.tool-top p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.stamp {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 2px solid var(--cat, var(--ink));
  background: var(--cream);
  overflow: hidden;
}

.stamp svg {
  width: 24px;
  height: 24px;
  stroke: var(--cat, var(--ink));
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.tool-body {
  min-height: 0;
  padding: 18px 22px;
  display: grid;
  grid-template-columns: minmax(420px, 0.74fr) minmax(620px, 1.26fr);
  gap: 22px;
  align-items: start;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 12px;
  row-gap: 11px;
}

.field {
  display: grid;
  gap: 6px;
}

.field.is-wide {
  grid-column: 1 / -1;
}

label {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.input-wrap {
  position: relative;
}

input,
select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  padding: 0 12px;
  color: var(--ink);
  background: var(--field);
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

input {
  padding-right: 52px;
  font-family: var(--font-number);
  font-variant-numeric: tabular-nums;
}

select {
  font-family: var(--font-body);
}

input:focus,
select:focus {
  border-color: var(--cat, var(--olive));
  box-shadow: 0 0 0 4px var(--cat-focus, rgba(74, 124, 89, 0.14));
}

.unit {
  position: absolute;
  right: 11px;
  top: 50%;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  transform: translateY(-50%);
  pointer-events: none;
}

.method-box {
  margin-top: 13px;
  padding: 12px 13px;
  border-radius: 13px;
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--cat-bg, rgba(217, 118, 66, 0.07));
  font-size: 12px;
  line-height: 1.64;
}

.method-box code {
  padding: 2px 5px;
  border-radius: 6px;
  color: var(--ink);
  background: rgba(44, 36, 22, 0.08);
  font-family: var(--font-mono);
  font-size: 11px;
}

.input-section {
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--paper);
  margin-bottom: 10px;
}

.input-section-title {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cat, var(--muted));
  margin-bottom: 10px;
}

.inline-result {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.inline-result-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
}

.inline-result-value {
  font-family: var(--font-number);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  color: var(--cat, var(--ink));
}

.inline-result small {
  flex-basis: 100%;
  color: var(--muted);
  font-size: 11px;
}

.advanced-section,
.formula-section {
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(255, 249, 239, 0.5);
  margin-bottom: 10px;
  overflow: hidden;
}

.advanced-section[open],
.formula-section[open] {
  background: var(--paper);
}

.advanced-section > summary,
.formula-section > summary {
  padding: 11px 13px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.formula-section > summary {
  color: rgba(107, 93, 79, 0.6);
  font-weight: 400;
}

.advanced-section > summary::before,
.formula-section > summary::before {
  content: "▸";
  font-size: 10px;
  transition: transform 160ms ease;
}

.advanced-section[open] > summary::before,
.formula-section[open] > summary::before {
  transform: rotate(90deg);
}

.advanced-section > summary::-webkit-details-marker,
.formula-section > summary::-webkit-details-marker {
  display: none;
}

.advanced-body,
.formula-body {
  padding: 0 13px 13px;
}

.formula-body {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
}

.formula-body code {
  padding: 2px 5px;
  border-radius: 6px;
  color: var(--ink);
  background: rgba(44, 36, 22, 0.08);
  font-family: var(--font-mono);
  font-size: 11px;
}

.formula-body p {
  margin: 0 0 6px;
}

.formula-body p:last-child {
  margin-bottom: 0;
}

.field-hint {
  margin-top: 8px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
}

.result-details {
  grid-column: 1 / -1;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 249, 239, 0.5);
  overflow: hidden;
  align-self: end;
}

.result-details > summary {
  padding: 11px 13px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-details > summary::before {
  content: "▸";
  font-size: 10px;
  transition: transform 160ms ease;
}

.result-details[open] > summary::before {
  transform: rotate(90deg);
}

.result-details > summary::-webkit-details-marker {
  display: none;
}

.result-details-grid {
  padding: 0 13px 13px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.metric.small {
  min-height: auto;
  padding: 10px 12px;
  border-radius: 11px;
}

.metric.small .metric-value {
  font-size: 18px;
  margin-top: 4px;
}

.metric.small small {
  margin-top: 3px;
  font-size: 10px;
}

.results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.metric {
  min-width: 0;
  min-height: 106px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 13px;
  background: var(--paper);
  overflow: hidden;
}

.metric.primary {
  grid-column: 1 / -1;
  color: var(--white);
  background: linear-gradient(135deg, #2e3f31, #263020);
  background: linear-gradient(135deg, color-mix(in srgb, var(--cat) 65%, #1a1a1a), color-mix(in srgb, var(--cat) 45%, #1a1a1a));
  border-color: rgba(44, 36, 22, 0.3);
}

.metric.primary .metric-label {
  opacity: 0.85;
  font-size: 11px;
}

.metric-accent-cat {
  border-top: 4px solid var(--cat, var(--orange));
}

.metric-accent-olive {
  border-top: 4px solid var(--olive);
}

.metric-accent-blue {
  border-top: 4px solid var(--blue);
}

/* Fallback for pages that don't use accent classes */
.results > .metric:nth-child(2) {
  border-top: 4px solid var(--cat, var(--orange));
}

.results > .metric:nth-child(3) {
  border-top: 4px solid var(--olive);
}

.results > .metric:nth-child(4) {
  border-top: 4px solid var(--blue);
}

.metric-label {
  display: block;
  color: inherit;
  opacity: 0.72;
  font-size: 10px;
  font-weight: 700;
}

.metric-value {
  display: block;
  margin-top: 7px;
  font-family: var(--font-number);
  font-variant-numeric: tabular-nums;
  font-size: clamp(25px, 2.1vw, 36px);
  line-height: 1.06;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.metric small {
  display: block;
  margin-top: 7px;
  color: inherit;
  opacity: 0.72;
  font-size: 11px;
  line-height: 1.42;
}

.metric.warn {
  border-color: var(--orange);
  border-top: 4px solid var(--orange);
  background: rgba(217, 118, 66, 0.06);
}

.tool-foot {
  min-height: 58px;
  padding: 12px 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: rgba(255, 249, 239, 0.62);
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  line-height: 1.58;
}

.tool-foot::before {
  content: "";
  width: 4px;
  align-self: stretch;
  border-radius: 999px;
  background: var(--cat, var(--orange));
  flex: 0 0 auto;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 24px 0;
  color: var(--muted);
  font-size: 13px;
  position: relative;
  z-index: 1;
}

.footer-inner {
  width: min(1840px, calc(100% - 48px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.icp-link {
  color: inherit;
  border-bottom: 1px solid rgba(107, 93, 79, 0.42);
  transition: color 180ms ease, border-color 180ms ease;
}

.icp-link:hover {
  color: var(--orange);
  border-color: var(--orange);
}

@media (max-width: 1080px) {
  .tool-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: block;
  }

  .tool-menu {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .side-note {
    margin-top: 14px;
  }

  .tool-body {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .nav {
    display: none;
  }

  .topbar-inner,
  .directory-shell,
  .tool-shell,
  .footer-inner {
    width: min(100% - 20px, 1840px);
  }

  .tool-menu,
  .field-grid,
  .results,
  .result-details-grid {
    grid-template-columns: 1fr;
  }

  .metric.primary {
    grid-column: auto;
  }

  .tool-top,
  .tool-foot {
    display: block;
  }

  .stamp {
    margin-top: 10px;
  }
}