:root {
  color-scheme: light;
  --ink: oklch(21% 0.014 70);
  --muted: oklch(45% 0.018 70);
  --soft: oklch(65% 0.018 70);
  --paper: oklch(98% 0.007 78);
  --panel: oklch(95% 0.011 78);
  --panel-2: oklch(91.5% 0.014 78);
  --line: oklch(83% 0.018 78);
  --accent: oklch(49% 0.11 166);
  --accent-dark: oklch(36% 0.092 166);
  --accent-soft: oklch(91% 0.044 166);
  --blue: oklch(48% 0.1 245);
  --warn: oklch(62% 0.12 72);
  --bad: oklch(55% 0.14 28);
  --good: oklch(48% 0.11 150);
  --radius: 8px;
  --shadow: 0 18px 46px oklch(28% 0.022 70 / 0.12);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(180deg, oklch(96.5% 0.018 78), var(--paper) 420px);
  font-size: 15px;
  line-height: 1.5;
}

a {
  color: inherit;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
.button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  padding: 0 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  cursor: pointer;
  transition: background 170ms ease-out, border-color 170ms ease-out, transform 170ms ease-out;
}

button:hover,
.button:hover {
  background: var(--panel);
  border-color: oklch(74% 0.026 78);
}

button:active,
.button:active {
  transform: translateY(1px);
}

button:focus-visible,
.button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid oklch(69% 0.08 166 / 0.38);
  outline-offset: 2px;
}

.primary {
  color: oklch(98% 0.006 166);
  background: var(--accent);
  border-color: var(--accent);
}

.primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: oklch(98% 0.007 78 / 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 760;
  text-decoration: none;
}

.mark {
  width: 32px;
  height: 32px;
  border-radius: 7px;
  display: grid;
  place-items: center;
  color: oklch(98% 0.006 166);
  background: var(--accent);
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 7px;
}

.nav-links a:hover {
  background: var(--panel);
  color: var(--ink);
}

.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 18px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 36px;
  padding: 54px 18px 30px;
  align-items: start;
}

.eyebrow {
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0;
  margin: 0 0 10px;
}

h1,
h2,
h3 {
  letter-spacing: 0;
  line-height: 1.08;
  margin: 0;
}

h1 {
  font-size: 44px;
  max-width: 780px;
}

h2 {
  font-size: 28px;
}

h3 {
  font-size: 18px;
}

p {
  color: var(--muted);
  margin: 0;
}

.lead {
  font-size: 18px;
  line-height: 1.55;
  max-width: 72ch;
  margin-top: 16px;
}

.hero-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.hero-panel,
.tool-panel,
.result-panel,
.plain-panel {
  border: 1px solid var(--line);
  background: oklch(99% 0.005 78);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 18px;
}

.mini-ledger {
  display: grid;
  gap: 12px;
}

.ledger-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.ledger-line:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.ledger-line span {
  color: var(--muted);
}

.ledger-line strong {
  font-size: 20px;
}

.tool-shell {
  padding: 28px 18px 54px;
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
  gap: 18px;
  align-items: start;
}

.tool-panel,
.result-panel,
.plain-panel {
  padding: 18px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 18px;
  margin-bottom: 18px;
}

.section-head p {
  margin-top: 5px;
}

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

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

.field.full {
  grid-column: 1 / -1;
}

label,
.field-label {
  color: var(--ink);
  font-size: 13px;
  font-weight: 690;
}

input,
select,
textarea {
  min-height: 42px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  padding: 9px 11px;
}

textarea {
  min-height: 180px;
  resize: vertical;
}

.hint {
  color: var(--soft);
  font-size: 12px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 42px;
}

.check-row input {
  width: 18px;
  min-height: 18px;
}

.group-title {
  grid-column: 1 / -1;
  margin-top: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--accent-dark);
  font-weight: 780;
}

.preset-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 0 0 16px;
}

.result-stack {
  display: grid;
  gap: 14px;
}

.metric-large {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.metric-large span {
  color: var(--muted);
  display: block;
  margin-bottom: 6px;
}

.metric-large strong {
  font-size: 42px;
  line-height: 1;
}

.meter {
  height: 10px;
  border-radius: 999px;
  background: var(--panel-2);
  overflow: hidden;
  margin-top: 12px;
}

.meter::before {
  content: "";
  display: block;
  width: var(--value, 0%);
  height: 100%;
  background: var(--accent);
}

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

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

.metric span {
  color: var(--muted);
  font-size: 12px;
}

.metric strong {
  display: block;
  margin-top: 5px;
  font-size: 20px;
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--ink);
  font-size: 12px;
  font-weight: 760;
}

.status.good {
  background: oklch(91% 0.05 150);
  color: oklch(31% 0.08 150);
}

.status.ok {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.status.warn {
  background: oklch(92% 0.06 72);
  color: oklch(38% 0.08 72);
}

.status.bad {
  background: oklch(92% 0.055 28);
  color: oklch(36% 0.1 28);
}

.break-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.break-row span {
  color: var(--muted);
}

.break-row:last-child {
  border-bottom: 0;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
  background: var(--paper);
}

th,
td {
  text-align: left;
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

th {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
  background: var(--panel);
}

tr:last-child td {
  border-bottom: 0;
}

.content-band {
  padding: 18px 18px 62px;
}

.tool-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.tool-link {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 15px;
  text-decoration: none;
  display: grid;
  gap: 8px;
}

.tool-link:hover {
  border-color: oklch(72% 0.034 78);
  background: var(--panel);
}

.tool-link span {
  color: var(--muted);
  font-size: 13px;
}

.insights {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.insights li {
  margin: 8px 0;
}

.formula {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 12px;
  color: var(--muted);
}

.source-list {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.info-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 15px;
}

.info-card p,
.faq-stack p {
  margin-top: 8px;
}

.faq-stack {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 14px 15px;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--ink);
}

.faq-item[open] summary {
  margin-bottom: 8px;
}

.checklist {
  margin: 16px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.checklist li + li {
  margin-top: 8px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px 18px;
  color: var(--muted);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

@media (max-width: 960px) {
  .hero,
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .tool-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  h1 {
    font-size: 34px;
  }

  .field-grid,
  .metric-grid,
  .tool-list {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 34px;
  }
}