:root {
  --ink: #12352e;
  --ink-2: #1c4a41;
  --bone: #e8ede8;
  --paper: #f4f7f4;
  --amber: #d4a017;
  --muted: #4a635c;
  --line: #c5d1c8;
  --white: #fbfcfb;
  --radius: 2px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  line-height: 1.7;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--ink-2);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.site-head {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 64px;
  max-height: 80px;
  padding: 0.5rem 1.25rem;
  background: var(--ink);
  color: var(--bone);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--bone);
  text-decoration: none;
  flex-shrink: 0;
}

.brand img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--bone);
}

.brand span {
  font-weight: 650;
  letter-spacing: 0.04em;
}

.nav-toggle {
  margin-left: auto;
  display: none;
  background: transparent;
  color: var(--bone);
  border: 1px solid var(--amber);
  padding: 0.4rem 0.75rem;
  min-height: 40px;
  cursor: pointer;
  font: inherit;
}

.site-nav {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.35rem 1.1rem;
  margin-left: auto;
  align-items: center;
}

.site-nav a {
  color: var(--bone);
  text-decoration: none;
  font-size: 0.92rem;
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--amber);
}

.shell {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  min-height: calc(100dvh - 64px);
}

.rail {
  background: var(--ink-2);
  color: var(--bone);
  padding: 1.5rem 1rem 2.5rem;
  border-right: 1px solid #0c2621;
}

.rail h2 {
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.rail ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.rail li {
  border-bottom: 1px solid rgba(232, 237, 232, 0.12);
}

.rail a {
  display: block;
  padding: 0.55rem 0;
  color: var(--bone);
  text-decoration: none;
  font-size: 0.92rem;
}

.rail a.is-active {
  color: var(--amber);
}

.page {
  min-width: 0;
  padding: 1.25rem 1.5rem 3rem;
}

.crumb {
  font-size: 0.86rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

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

.meta-line {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 0 0 1.25rem;
}

h1 {
  font-size: clamp(1.6rem, 2.4vw, 2.15rem);
  line-height: 1.25;
  margin: 0 0 0.75rem;
  font-weight: 680;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.2rem;
  margin: 1.6rem 0 0.7rem;
  line-height: 1.35;
}

p {
  margin: 0 0 1rem;
  max-width: 68ch;
}

.article-body p {
  max-width: 68ch;
}

.lead {
  font-size: 1.05rem;
  color: var(--ink-2);
}

.figure {
  margin: 0 0 1.25rem;
}

.figure img {
  width: 100%;
  object-fit: cover;
  border-radius: var(--radius);
}

.caption {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

.site-foot {
  background: var(--ink);
  color: var(--bone);
  padding: 1.75rem 1.5rem 2.2rem;
}

.foot-grid {
  display: grid;
  gap: 0.35rem;
  max-width: 960px;
}

.site-foot p {
  margin: 0;
  font-size: 0.86rem;
  color: var(--bone);
  max-width: none;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 1.75rem;
  align-items: start;
}

.article-layout.layout-wide aside {
  order: -1;
}

.article-layout.layout-stack {
  grid-template-columns: 1fr;
}

.article-layout.layout-stack aside {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

aside.related {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 1rem;
  border-radius: var(--radius);
}

aside.related h2 {
  margin-top: 0;
  font-size: 0.95rem;
}

aside.related ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

aside.related li {
  margin: 0 0 0.65rem;
}

aside.related a {
  color: var(--ink);
}

.cat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 52rem;
}

.cat-list li {
  display: grid;
  grid-template-columns: 7.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
}

.cat-list time {
  color: var(--muted);
  font-size: 0.86rem;
}

.mast {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 1.5rem;
  align-items: center;
  margin-bottom: 1.5rem;
}

.mast img {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  border-radius: var(--radius);
}

.lanes {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.lanes a {
  display: grid;
  grid-template-columns: 2.2rem 1fr auto;
  gap: 0.75rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--ink);
}

.lanes a strong {
  font-weight: 650;
}

.lanes a span {
  color: var(--muted);
  font-size: 0.88rem;
}

.feat {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 1rem;
  margin: 1.5rem 0;
}

.feat img {
  width: 100%;
  height: 100%;
  max-height: 320px;
  object-fit: cover;
}

.strip {
  background: var(--ink);
  color: var(--bone);
  padding: 1.25rem 1.1rem;
  margin: 1.5rem 0;
}

.strip h2,
.strip p {
  color: var(--bone);
}

.strip ol {
  margin: 0;
  padding-left: 1.2rem;
}

.duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.mosaic {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.mosaic img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.date-block {
  background: var(--white);
  border-left: 3px solid var(--amber);
  padding: 1rem 1.1rem;
  margin: 1.5rem 0;
}

.num-list {
  counter-reset: rec;
  list-style: none;
  margin: 0;
  padding: 0;
}

.num-list li {
  counter-increment: rec;
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.6rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
}

.num-list li::before {
  content: counter(rec, decimal-leading-zero);
  color: var(--amber);
  font-weight: 700;
}

.org-strip {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.split-body {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 1.25rem;
}

.split-body img {
  width: 100%;
  object-fit: cover;
}

.faq p {
  margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--ink-2);
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem 1rem 1rem;
    gap: 0.4rem;
  }

  .site-nav.is-open {
    display: flex;
  }

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

  .rail {
    display: none;
  }

  .mast,
  .feat,
  .duo,
  .mosaic,
  .article-layout,
  .article-layout.layout-stack,
  .split-body,
  .cat-list li {
    grid-template-columns: 1fr;
  }

  .article-layout.layout-stack aside {
    grid-template-columns: 1fr;
  }

  .page {
    padding: 1rem 1rem 2.5rem;
  }
}