:root {
  color-scheme: light dark;
  --bg: #f4f1e8;
  --surface: #fffdf7;
  --surface-2: #ece7da;
  --surface-3: #e5dfd1;
  --ink: #1f2a2a;
  --muted: #5e6a66;
  --line: #d8d1c2;
  --line-strong: #bdb4a3;
  --accent: #16665e;
  --accent-strong: #0e4f49;
  --accent-soft: #e3f1ee;
  --brass: #a9782f;
  --brass-soft: #f3e6cf;
  --danger: #a33a2b;
  --danger-soft: #f7e5e0;
  --shadow: 0 1px 2px rgba(31, 42, 42, 0.06), 0 10px 30px rgba(31, 42, 42, 0.05);
  --radius: 16px;
  --radius-sm: 10px;
  --font-sans: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", "Times New Roman", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161b1a;
    --surface: #1e2523;
    --surface-2: #28302d;
    --surface-3: #313b37;
    --ink: #eef1ea;
    --muted: #aab5ae;
    --line: #3a4440;
    --line-strong: #52605a;
    --accent: #6fc7b8;
    --accent-strong: #9fe0d3;
    --accent-soft: #223a35;
    --brass: #d4a35f;
    --brass-soft: #3a2f20;
    --danger: #f08a7a;
    --danger-soft: #3d2420;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 12px 30px rgba(0, 0, 0, 0.18);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

[hidden] {
  display: none !important;
}

img,
svg {
  max-width: 100%;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

:focus-visible {
  outline: 3px solid var(--brass);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 50;
  transform: translateY(-200%);
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--bg);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
}

.header-inner,
.page-shell,
.site-footer-inner {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.35rem;
  height: 2.35rem;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--brass-soft);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-sub {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.15rem;
  font-size: 0.86rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

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

.site-nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-color: var(--brass);
  text-decoration-thickness: 2px;
}

.page-shell {
  padding-block: 3rem 4.5rem;
}

.hero {
  max-width: 760px;
  margin-bottom: 2rem;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--brass);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  color: var(--ink);
  font-family: var(--font-serif);
  line-height: 1.35;
  text-wrap: balance;
}

h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 3.35rem);
  letter-spacing: 0.02em;
}

h2 {
  margin: 0 0 0.9rem;
  font-size: clamp(1.35rem, 2.5vw, 1.8rem);
}

h3 {
  margin: 1.6rem 0 0.55rem;
  font-size: 1.15rem;
}

p {
  margin: 0 0 1rem;
}

.lead {
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.tool-section {
  margin-bottom: 3rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.85fr);
  gap: 1.25rem;
  align-items: start;
}

.tool-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: clamp(1.1rem, 2.5vw, 1.6rem);
}

.tool-input-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.field-label {
  display: block;
  margin: 0;
  font-weight: 700;
  font-size: 0.92rem;
}

.field-hint {
  margin: -0.35rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.textarea,
.input {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--ink);
  font: inherit;
}

.textarea {
  min-height: 360px;
  resize: vertical;
  padding: 1rem;
  line-height: 1.8;
}

.textarea::placeholder,
.input::placeholder {
  color: var(--muted);
  opacity: 0.75;
}

.textarea:focus,
.input:focus {
  border-color: var(--accent);
  outline: 3px solid color-mix(in srgb, var(--accent) 22%, transparent);
  outline-offset: 1px;
}

.tool-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.84rem;
  cursor: pointer;
}

.checkbox input {
  width: 1.05rem;
  height: 1.05rem;
  accent-color: var(--accent);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.55rem;
  padding: 0.55rem 0.95rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.button-primary {
  background: var(--accent);
  color: var(--bg);
}

.button-primary:hover {
  background: var(--accent-strong);
  color: var(--bg);
}

.button-secondary {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.button-ghost {
  background: transparent;
  color: var(--muted);
}

.button-ghost:hover {
  background: var(--surface-2);
  color: var(--ink);
}

.button-small {
  min-height: 2rem;
  padding: 0.35rem 0.7rem;
  font-size: 0.78rem;
}

.goal-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
}

.goal-row .field-label {
  flex: 1 1 10rem;
}

.goal-row .input {
  flex: 0 1 9rem;
  min-height: 2.6rem;
  padding: 0.45rem 0.7rem;
}

.long-text-note,
.support-note {
  margin: 0;
  padding: 0.65rem 0.8rem;
  border-radius: var(--radius-sm);
  background: var(--brass-soft);
  color: var(--ink);
  font-size: 0.8rem;
}

.result-card {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  border-top: 4px solid var(--accent);
}

.result-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}

.result-head h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.copy-status {
  min-height: 1.2em;
  margin: -0.4rem 0 0;
  color: var(--accent-strong);
  font-size: 0.78rem;
}

.result-primary {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--line);
}

.result-label {
  color: var(--muted);
  font-size: 0.78rem;
}

.result-number {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 3.6rem);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  line-height: 1.1;
}

.result-unit {
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 400;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
  margin: 0;
}

.result-item {
  padding: 0.65rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
}

.result-item dt {
  color: var(--muted);
  font-size: 0.72rem;
}

.result-item dd {
  margin: 0.1rem 0 0;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.goal-result {
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
}

.goal-label {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
}

.goal-result strong {
  font-size: 0.95rem;
}

.privacy-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.6;
}

.content-section {
  max-width: 900px;
  margin-top: 3.2rem;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-heading h2 {
  margin: 0;
}

.section-heading a {
  font-size: 0.8rem;
  white-space: nowrap;
}

.prose {
  max-width: 760px;
}

.prose p,
.prose li {
  color: var(--ink);
}

.prose ul,
.prose ol {
  padding-left: 1.35rem;
}

.prose li {
  margin-bottom: 0.35rem;
}

.prose code {
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--surface-2);
  font-family: ui-monospace, "Cascadia Code", "Consolas", monospace;
  font-size: 0.88em;
}

.note {
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--brass);
  background: var(--brass-soft);
  color: var(--ink);
  font-size: 0.88rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-width: 0;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 160ms ease, transform 160ms ease;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  color: var(--ink);
}

.card-kicker {
  color: var(--brass);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.5;
}

.card-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.7;
}

.faq {
  max-width: 760px;
}

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.faq summary:hover {
  color: var(--accent-strong);
}

.faq details p {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.article {
  max-width: 820px;
}

.article-header {
  max-width: 760px;
  margin-bottom: 2rem;
}

.article-meta {
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.article-body {
  max-width: 760px;
}

.article-body h2 {
  margin-top: 2.6rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
}

.article-body h3 {
  margin-top: 1.8rem;
}

.article-body ul,
.article-body ol {
  padding-left: 1.4rem;
}

.article-body li {
  margin-bottom: 0.45rem;
}

.article-body blockquote {
  margin: 1.4rem 0;
  padding: 0.8rem 1rem;
  border-left: 3px solid var(--brass);
  background: var(--surface-2);
  color: var(--muted);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.88rem;
}

.article-body th,
.article-body td {
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-body th {
  background: var(--surface-2);
}

.table-wrap {
  overflow-x: auto;
}

.breadcrumbs {
  margin-bottom: 1.2rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.35rem;
  color: var(--line-strong);
}

.breadcrumbs a {
  color: var(--muted);
}

.callout {
  margin: 1.4rem 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
}

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

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: 2rem;
}

.site-footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-brand {
  max-width: 24rem;
}

.footer-brand .brand-name {
  display: block;
  margin-bottom: 0.25rem;
}

.footer-brand p {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  font-size: 0.78rem;
}

.footer-links a {
  color: var(--muted);
}

.footer-note {
  width: 100%;
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.72rem;
}

.page-404 {
  display: grid;
  min-height: 45vh;
  place-items: center;
  text-align: center;
}

.page-404 h1 {
  font-size: clamp(3rem, 12vw, 6rem);
  margin-bottom: 0.5rem;
}

.page-404 p {
  color: var(--muted);
}

.contact-box {
  max-width: 680px;
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.contact-box a {
  font-weight: 700;
}

.share-section {
  max-width: 760px;
  margin-top: 3rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}

.share-section h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}

.share-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.share-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.35rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

.share-link:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.share-link[aria-disabled="true"] {
  opacity: 0.55;
  pointer-events: none;
}

.share-more {
  margin-top: 0.8rem;
}

.share-more summary {
  color: var(--muted);
  font-size: 0.78rem;
  cursor: pointer;
}

.share-more summary:hover {
  color: var(--accent-strong);
}

.share-more .share-links {
  margin-top: 0.65rem;
}

.share-status {
  min-height: 1.2em;
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.75rem;
}

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

  .result-card {
    order: 2;
  }

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

@media (max-width: 640px) {
  .header-inner,
  .page-shell,
  .site-footer-inner {
    width: min(100% - 1.5rem, 1120px);
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.65rem;
    padding-block: 0.85rem;
  }

  .site-nav {
    gap: 0.25rem 0.9rem;
    font-size: 0.8rem;
  }

  .page-shell {
    padding-block: 2rem 3.5rem;
  }

  .textarea {
    min-height: 260px;
  }

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

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

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
  }

  .goal-row {
    align-items: stretch;
    flex-direction: column;
  }

  .goal-row .input {
    flex-basis: auto;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}