.guide-page {
  background: #fff;
}

.guide-page .site-header {
  background: rgba(255, 255, 255, 0.96);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 16px;
  color: var(--white) !important;
  background: var(--red);
  border-radius: 10px;
}

.header-cta:hover {
  color: var(--white) !important;
  background: var(--red-dark);
}

.article-hero {
  padding: 54px max(24px, calc((100% - 980px) / 2)) 66px;
  background:
    radial-gradient(circle at 84% 18%, rgba(207, 32, 38, 0.08), transparent 25%),
    linear-gradient(180deg, #fff 0%, var(--red-pale) 100%);
  border-bottom: 1px solid var(--line);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 44px;
  color: #968986;
  font-size: 0.76rem;
}

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

.breadcrumb a:hover {
  color: var(--red);
}

.article-hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(2.15rem, 5.2vw, 4rem);
  line-height: 1.34;
  letter-spacing: 0.015em;
}

.article-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 42px;
}

.article-hero h1 span {
  color: var(--red-dark);
  font-size: 0.67em;
}

.article-lead {
  max-width: 760px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(0.98rem, 1.8vw, 1.12rem);
  line-height: 2;
}

.article-meta {
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: flex-end;
  gap: 20px;
  padding-top: 8px;
  color: #998d8a;
  font-size: 0.75rem;
  text-align: right;
}

.article-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 760px);
  gap: 70px;
  width: min(1100px, calc(100% - 48px));
  margin: 0 auto;
  padding: 84px 0 110px;
}

.table-of-contents {
  position: sticky;
  top: 24px;
  align-self: start;
  padding: 22px 20px;
  background: var(--red-pale);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.table-of-contents p {
  margin: 0 0 13px;
  font-size: 0.8rem;
  font-weight: 800;
}

.table-of-contents ol {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
  counter-reset: toc;
}

.table-of-contents li {
  counter-increment: toc;
}

.table-of-contents a {
  display: grid;
  grid-template-columns: 20px 1fr;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.55;
  text-decoration: none;
}

.table-of-contents a::before {
  color: #bdada9;
  content: counter(toc, decimal-leading-zero);
  font-size: 0.65rem;
  font-weight: 800;
}

.table-of-contents a:hover {
  color: var(--red);
}

.article-body > section {
  scroll-margin-top: 24px;
}

.article-body > section + section {
  margin-top: 92px;
  padding-top: 4px;
}

.article-body .section-number {
  margin: 0 0 8px;
  color: var(--red);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.article-body h2 {
  margin: 0 0 24px;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  line-height: 1.55;
}

.article-body > section > p:not(.section-number),
.item-list p,
.mistake-grid p,
.article-cta p {
  color: #5f5553;
  font-size: 0.95rem;
  line-height: 2;
}

.principle-box {
  margin: 32px 0;
  padding: 24px 26px;
  background: var(--red-pale);
  border-left: 5px solid var(--red);
  border-radius: 0 12px 12px 0;
}

.principle-box strong {
  display: block;
  margin-bottom: 7px;
  color: var(--red-dark);
  font-size: 0.85rem;
}

.principle-box p {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.8;
}

.item-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 34px;
}

.item-list > section {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 14px;
  padding: 22px;
  border: 1px solid #eadfdd;
  border-radius: 14px;
}

.item-list > section > span {
  display: grid;
  width: 34px;
  height: 34px;
  color: var(--white);
  background: var(--red);
  border-radius: 50%;
  font-size: 0.78rem;
  font-weight: 800;
  place-items: center;
}

.item-list h3 {
  margin: 4px 0 8px;
  font-size: 0.98rem;
}

.item-list p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.8;
}

.redmine-example {
  margin-top: 36px;
}

.redmine-example-number {
  margin: 0 0 16px;
  color: #222;
  font-size: 1.55rem;
  line-height: 1.2;
}

.redmine-example-card {
  padding: 0;
  color: #222;
  background: #ffffdd;
  border: 1px solid #d7d7bd;
  border-radius: 4px;
  font-family: Arial, "Helvetica Neue", sans-serif;
}

.redmine-example-card > h4 {
  margin: 0;
  padding: 18px 20px 0;
  color: #222;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  line-height: 1.4;
}

.redmine-example-created {
  margin: 0;
  padding: 12px 20px 18px;
  color: #333;
  font-size: 0.86rem;
  line-height: 1.6;
}

.redmine-example-created a {
  color: #0b4f91;
  text-decoration: none;
}

.redmine-example-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 38px;
  padding: 0 20px 18px;
}

.redmine-example-meta dl {
  margin: 0;
}

.redmine-example-meta dl > div {
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr);
  gap: 10px;
  padding: 5px 0;
  font-size: 0.82rem;
  line-height: 1.5;
}

.redmine-example-meta dt {
  font-weight: 700;
}

.redmine-example-meta dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.redmine-example-description {
  margin: 0 20px;
  padding: 20px 0;
  border-top: 1px solid #dedfc7;
}

.redmine-example-description h5 {
  margin: 0 0 16px;
  font-size: 1.15rem;
}

.redmine-example-description section + section {
  margin-top: 20px;
}

.redmine-example-description h6 {
  margin: 0 0 8px;
  color: #30475f;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  font-size: 0.92rem;
}

.redmine-example-description p,
.redmine-example-description ol,
.redmine-example-description ul {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
}

.redmine-example-description ol,
.redmine-example-description ul {
  padding-left: 22px;
}

.redmine-example-evidence {
  padding-bottom: 22px;
}

.redmine-example-evidence li {
  color: #0b4f91;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.redmine-example-description section:nth-of-type(6) p {
  color: inherit;
  font-weight: 700;
}

.why-it-works {
  margin-top: 30px;
  padding: 26px 28px;
  background: #f5f8fa;
  border-radius: 14px;
}

.why-it-works h3 {
  margin: 0 0 14px;
  color: #344d62;
  font-size: 0.95rem;
}

.why-it-works ul {
  display: grid;
  gap: 10px;
  padding-left: 1.25em;
  margin: 0;
  color: #526575;
  font-size: 0.84rem;
  line-height: 1.75;
}

.mistake-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.mistake-grid section {
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
}

.mistake-grid h3 {
  margin: 0 0 9px;
  font-size: 0.96rem;
}

.mistake-grid p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.8;
}

.check-list {
  display: grid;
  gap: 0;
  padding: 0;
  margin: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.check-list li {
  position: relative;
  padding: 18px 10px 18px 44px;
  color: #514744;
  border-bottom: 1px solid var(--line);
  font-size: 0.91rem;
  line-height: 1.7;
}

.check-list li::before {
  position: absolute;
  top: 18px;
  left: 8px;
  display: grid;
  width: 24px;
  height: 24px;
  color: var(--white);
  background: var(--red);
  border-radius: 50%;
  content: "✓";
  font-size: 0.72rem;
  font-weight: 800;
  place-items: center;
}

.article-body > .article-cta {
  display: grid;
  grid-template-columns: 150px 1fr;
  align-items: center;
  gap: 30px;
  margin-top: 96px;
  padding: 34px;
  background: var(--red-pale);
  border: 1px solid var(--line);
  border-radius: 20px;
}

.article-cta img {
  width: 100%;
  height: auto;
}

.article-cta h2 {
  margin-bottom: 8px;
  font-size: 1.35rem;
}

.article-cta p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.8;
}

.article-cta .start-button {
  min-height: 46px;
  margin-top: 20px;
  font-size: 0.82rem;
}

@media (max-width: 900px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .article-title-row {
    display: block;
  }

  .article-meta {
    align-items: flex-start;
    flex-direction: row;
    margin-top: 22px;
    padding-top: 0;
    text-align: left;
  }

  .table-of-contents {
    position: static;
  }

  .table-of-contents ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .guide-page .header-links a:first-child {
    display: none;
  }

  .guide-page .header-cta {
    display: none;
  }

  .article-hero {
    padding: 34px 20px 48px;
  }

  .breadcrumb {
    margin-bottom: 34px;
  }

  .article-hero h1 {
    font-size: 2rem;
  }

  .article-hero h1 span {
    font-size: 0.68em;
  }

  .article-meta {
    flex-direction: column;
    gap: 6px;
  }

  .article-layout {
    width: min(100% - 32px, 1100px);
    padding: 52px 0 72px;
  }

  .table-of-contents ol,
  .item-list,
  .mistake-grid {
    grid-template-columns: 1fr;
  }

  .article-body > section + section {
    margin-top: 68px;
  }

  .item-list > section {
    padding: 18px;
  }

  .redmine-example-meta {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .redmine-example-meta dl > div {
    grid-template-columns: 118px minmax(0, 1fr);
  }

  .article-body > .article-cta {
    grid-template-columns: 1fr;
    padding: 26px 22px;
    text-align: center;
  }

  .article-cta img {
    width: 140px;
    margin: 0 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .header-cta {
    transition: none;
  }
}