:root {
  --color-main: #166534;
  --color-main-dark: #064e3b;
  --color-cta: #d97706;
  --color-cta-hover: #b45309;
  --color-accent: #0f766e;
  --color-soft: #f0fdf4;
  --color-section: #f8fafc;
  --color-warning: #ca8a04;
  --color-success: #15803d;
  --color-text: #111827;
  --color-muted: #4b5563;
  --color-border: #e5e7eb;
  --color-white: #ffffff;
  --color-footer: #17251e;
  --shadow-sm: 0 8px 24px rgba(17, 24, 39, 0.08);
  --shadow-md: 0 16px 44px rgba(17, 24, 39, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 108px;
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-white);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
  word-break: normal;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

a {
  color: var(--color-main);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-main-dark);
}

.screen-reader-text,
.c-skip-link {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.c-skip-link:focus {
  z-index: 1000;
  top: 12px;
  left: 12px;
  width: auto;
  height: auto;
  padding: 10px 14px;
  clip: auto;
  color: var(--color-white);
  background: var(--color-main-dark);
  border-radius: 6px;
}

.l-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(14px);
}

.l-header__inner {
  width: min(1180px, calc(100% - 40px));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.l-header__logo {
  flex: 0 0 auto;
}

.custom-logo-link,
.c-logo {
  display: inline-flex;
  align-items: center;
  width: 198px;
  max-width: 48vw;
}

.custom-logo-link img,
.c-logo img {
  display: block;
  width: 198px;
  height: auto;
}

.l-header__nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 14px;
  font-weight: 700;
}

.l-header__nav a {
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}

.l-header__nav a[aria-current="page"] {
  color: var(--color-main);
}

.l-header__toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-white);
}

.l-header__toggle span:not(.screen-reader-text) {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--color-main-dark);
}

.c-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 800;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  overflow-wrap: normal;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.c-button:hover {
  transform: translateY(-1px);
}

.c-button--cta,
.c-button--header {
  color: var(--color-white) !important;
  background: var(--color-cta);
  border-color: var(--color-cta);
}

.c-button--cta:hover,
.c-button--header:hover {
  background: var(--color-cta-hover);
  border-color: var(--color-cta-hover);
}

.c-button--ghost {
  color: var(--color-main-dark);
  background: var(--color-white);
  border-color: #bbd7c4;
}

.c-label {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 28px;
  padding: 5px 10px;
  color: var(--color-main-dark);
  background: var(--color-soft);
  border: 1px solid #bbf7d0;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  text-decoration: none;
}

.l-main {
  min-height: 60vh;
}

.l-container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.l-container--narrow {
  width: min(820px, calc(100% - 40px));
  padding: 48px 0 72px;
}

.l-container--article {
  padding: 34px 0 78px;
}

.l-section {
  padding: 72px 0;
}

.l-section--soft {
  background: var(--color-section);
}

.l-section--about {
  background: #fff7ed;
}

.p-hero {
  padding: 56px 0 64px;
  background: linear-gradient(180deg, #f0fdf4 0%, #ffffff 72%);
  border-bottom: 1px solid #d9f2df;
}

.p-hero__inner {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.92fr);
  align-items: center;
  gap: 42px;
}

.p-hero__eyebrow,
.c-kicker,
.c-section-heading p {
  margin: 0 0 8px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.p-hero h1 {
  margin: 0;
  color: var(--color-main-dark);
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.18;
  letter-spacing: 0;
  word-break: keep-all;
  overflow-wrap: normal;
  line-break: strict;
}

.p-hero__lead {
  max-width: 680px;
  margin: 22px 0 0;
  color: var(--color-muted);
  font-size: 17px;
  line-height: 1.9;
}

.p-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.p-hero__image {
  margin: 0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: #dcefe4;
}

.p-hero__image img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.c-section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
}

.c-section-heading h2,
.p-about h2 {
  margin: 0;
  color: var(--color-main-dark);
  font-size: 30px;
  line-height: 1.35;
}

.p-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.p-card-grid--related {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.p-post-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.p-post-card__image {
  display: block;
  background: var(--color-soft);
}

.p-post-card__image img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.p-post-card__body {
  padding: 18px;
}

.p-post-card h3 {
  margin: 12px 0 10px;
  font-size: 18px;
  line-height: 1.55;
}

.p-post-card h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.p-post-card p {
  margin: 0 0 12px;
  color: var(--color-muted);
  font-size: 14px;
}

.p-post-card time {
  color: #6b7280;
  font-size: 13px;
}

.p-category-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.p-category-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 70px;
  padding: 16px 18px;
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-decoration: none;
}

.p-category-card span {
  font-weight: 800;
}

.p-category-card small {
  color: var(--color-muted);
  white-space: nowrap;
}

.p-about {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}

.p-about p:last-child {
  margin: 0;
  color: #3f352c;
  font-size: 16px;
}

.p-cta {
  border: 1px solid #fed7aa;
  border-radius: 8px;
  background: #fff7ed;
  box-shadow: var(--shadow-sm);
}

.p-cta h2 {
  margin: 0 0 10px;
  color: #7c2d12;
  font-size: 24px;
  line-height: 1.45;
}

.p-cta p {
  margin: 0;
  color: #574433;
}

.p-cta--front,
.p-cta--article {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  padding: 30px;
}

.p-cta--article {
  margin-top: 56px;
}

.p-cta--article .c-button {
  min-width: 210px;
}

.p-breadcrumb {
  margin-bottom: 26px;
  color: var(--color-muted);
  font-size: 13px;
}

.p-breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
}

.p-breadcrumb__sep {
  margin: 0 8px;
  color: #9ca3af;
}

.l-content-sidebar {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  column-gap: 60px;
}

.p-article {
  flex: 0 1 760px;
  min-width: 0;
}

.p-article__header h1,
.p-page h1,
.p-archive-header h1 {
  margin: 12px 0 16px;
  color: var(--color-main-dark);
  font-size: 38px;
  line-height: 1.35;
  letter-spacing: 0;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.p-article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  color: var(--color-muted);
  font-size: 13px;
}

.p-article__thumb {
  margin: 28px 0 24px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--color-soft);
}

.p-article__thumb img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.p-summary,
.p-notice {
  margin: 0 0 34px;
  padding: 18px 20px;
  background: var(--color-soft);
  border: 1px solid #bbf7d0;
  border-left: 5px solid var(--color-main);
  border-radius: 8px;
}

.p-summary strong {
  display: block;
  margin-bottom: 4px;
  color: var(--color-main-dark);
}

.p-summary p,
.p-notice p {
  margin: 0.35em 0 0;
}

.p-article__body {
  color: var(--color-text);
  font-size: 16.75px;
  line-height: 1.9;
}

.p-article__body > *:first-child {
  margin-top: 0;
}

.p-article__body p {
  margin: 1.15em 0;
}

.p-article__body h2 {
  margin: 2.2em 0 0.9em;
  padding: 0 0 10px 16px;
  border-left: 5px solid var(--color-main);
  border-bottom: 1px solid #bbd7c4;
  color: var(--color-main-dark);
  font-size: 27px;
  line-height: 1.45;
}

.p-article__body h3 {
  margin: 1.9em 0 0.8em;
  padding: 12px 16px;
  border-left: 4px solid var(--color-accent);
  border-radius: 6px;
  background: var(--color-soft);
  color: #0b3f30;
  font-size: 22px;
  line-height: 1.5;
}

.p-article__body h4 {
  margin: 1.6em 0 0.6em;
  color: var(--color-main-dark);
  font-size: 18px;
  line-height: 1.55;
}

.p-article__body strong {
  font-weight: 800;
  background: linear-gradient(transparent 64%, #bbf7d0 64%);
}

.p-article__body .is-warning strong,
.p-article__body strong.is-warning {
  background: linear-gradient(transparent 64%, #fde68a 64%);
}

.p-article__body ul,
.p-article__body ol {
  padding-left: 1.4em;
}

.p-article__body table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  white-space: nowrap;
}

.p-article__body th,
.p-article__body td {
  padding: 10px 12px;
  border: 1px solid var(--color-border);
}

.p-article__body th {
  background: var(--color-section);
}

.p-article__body img {
  display: block;
  width: 100%;
  border-radius: 8px;
}

.p-page table {
  width: 100%;
  border-collapse: collapse;
}

.p-page th,
.p-page td {
  padding: 12px;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.l-sidebar {
  flex: 0 0 292px;
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: calc(100vh - 112px);
  overflow: visible;
  transform: translateY(var(--sidebar-footer-offset, 0px));
  will-change: transform;
}

.l-sidebar.is-footer-bound {
  transition: transform 0.12s ease-out;
}

.p-side-box {
  padding: 18px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}

.p-side-box h2 {
  margin: 0 0 12px;
  color: var(--color-main-dark);
  font-size: 16px;
  line-height: 1.35;
}

.p-toc {
  flex: 0 0 auto;
  max-height: none;
  overflow: hidden;
}

.p-toc__list {
  height: clamp(320px, 46vh, 440px);
  max-height: calc(100vh - 220px);
  overflow-y: auto;
  padding-right: 4px;
}

.p-toc__list:empty::before {
  content: "目次を生成できる見出しがありません。";
  color: var(--color-muted);
  font-size: 13px;
}

.p-toc__link {
  display: block;
  padding: 7px 8px;
  border-radius: 6px;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
}

.p-toc__link[data-level="3"] {
  padding-left: 18px;
}

.p-toc__link[data-level="4"] {
  padding-left: 30px;
}

.p-toc__link.is-active {
  color: var(--color-main-dark);
  background: var(--color-soft);
  font-weight: 800;
}

.p-side-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.p-side-list a {
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
}

.p-supervisor {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 18px;
  margin-top: 40px;
  padding: 22px;
  background: var(--color-section);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.p-supervisor img {
  width: 88px;
  height: 88px;
  object-fit: cover;
  border-radius: 50%;
}

.p-supervisor h2,
.p-related h2 {
  margin: 0 0 8px;
  color: var(--color-main-dark);
  font-size: 22px;
}

.p-supervisor p {
  margin: 4px 0;
}

.p-supervisor__label,
.u-muted {
  color: var(--color-muted);
  font-size: 13px;
}

.p-related {
  margin-top: 46px;
}

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

.p-archive-header {
  padding: 52px 0 28px;
}

.l-archive {
  padding-bottom: 72px;
}

.nav-links {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 36px;
}

.nav-links a,
.nav-links span {
  min-width: 40px;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-align: center;
  text-decoration: none;
}

.nav-links .current {
  color: var(--color-white);
  background: var(--color-main);
  border-color: var(--color-main);
}

.wpcf7 form {
  display: grid;
  gap: 18px;
}

.wpcf7 label {
  display: grid;
  gap: 6px;
  font-weight: 800;
}

.wpcf7 input,
.wpcf7 select,
.wpcf7 textarea {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  font: inherit;
}

.wpcf7 textarea {
  min-height: 180px;
}

.wpcf7 input[type="submit"] {
  width: auto;
  min-width: 180px;
  color: var(--color-white);
  background: var(--color-cta);
  border-color: var(--color-cta);
  font-weight: 800;
  cursor: pointer;
}

.l-footer {
  background: var(--color-footer);
  color: #d1d5db;
}

.l-footer__inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 46px 0 34px;
  display: grid;
  gap: 24px;
}

.l-footer__brand {
  display: grid;
  gap: 12px;
  max-width: 620px;
}

.l-footer__brand p {
  margin: 0;
}

.l-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
}

.l-footer a {
  color: #ecfdf5;
}

.l-footer__company,
.l-footer__copy {
  margin: 0;
  color: #a7b3aa;
  font-size: 13px;
}

.p-mobile-cta {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 90;
  display: none;
  min-height: 48px;
  padding: 12px 18px;
  color: var(--color-white);
  background: var(--color-cta);
  border-radius: 6px;
  box-shadow: var(--shadow-md);
  font-weight: 900;
  text-decoration: none;
}

.p-mobile-cta.is-hidden {
  display: none !important;
}

@media (max-width: 1100px) {
  .p-card-grid,
  .p-card-grid--related {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .l-content-sidebar {
    column-gap: 34px;
  }
}

@media (max-width: 980px) {
  html {
    scroll-padding-top: 84px;
  }

  .l-header__inner {
    width: min(100% - 28px, 1180px);
  }

  .l-header__toggle {
    display: block;
  }

  .l-header__nav {
    position: absolute;
    top: 76px;
    right: 14px;
    left: 14px;
    display: none;
    padding: 16px;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
  }

  .l-header__nav.is-open {
    display: grid;
    gap: 10px;
  }

  .l-header__nav .c-button {
    width: 100%;
  }

  .p-hero__inner {
    grid-template-columns: 1fr;
  }

  .p-hero h1 {
    font-size: 40px;
  }

  .p-about,
  .p-cta--front,
  .p-cta--article {
    grid-template-columns: 1fr;
  }

  .p-cta--article .c-button,
  .p-cta--front .c-button {
    width: fit-content;
    min-width: 220px;
  }

  .l-content-sidebar {
    display: block;
  }

  .l-sidebar {
    position: static;
    display: block;
    max-height: none;
    overflow: visible;
    margin-top: 44px;
    transform: none;
    will-change: auto;
  }

  .l-sidebar .p-side-box + .p-side-box {
    margin-top: 14px;
  }

  .p-toc {
    max-height: none;
  }

  .p-toc__list {
    max-height: 360px;
    overflow-y: auto;
  }

  .p-mobile-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

@media (max-width: 720px) {
  .l-container,
  .l-container--narrow,
  .l-container--article,
  .p-hero__inner,
  .l-footer__inner {
    width: calc(100% - 28px);
  }

  .l-section {
    padding: 52px 0;
  }

  .p-hero {
    padding: 40px 0 46px;
  }

  .p-hero h1 {
    font-size: 34px;
  }

  .p-hero__lead,
  .p-article__body {
    font-size: 16px;
  }

  .p-card-grid,
  .p-card-grid--related,
  .p-category-grid {
    grid-template-columns: 1fr;
  }

  .c-section-heading {
    display: block;
  }

  .p-article__header h1,
  .p-page h1,
  .p-archive-header h1 {
    font-size: 30px;
  }

  .p-article__body h2 {
    font-size: 24px;
  }

  .p-article__body h3 {
    font-size: 20px;
  }

  .p-cta--front,
  .p-cta--article {
    padding: 22px;
  }

  .p-supervisor {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}