* {
  box-sizing: border-box;
}

:root {
  --page-bg: #ffffff;
  --panel-bg: #ffffd5;
  --border: #c4c4c4;
  --text: #222;
  --link: #003399;
  --caption: #0000d4;
  --quote: #000080;
}

body {
  margin: 0;
  padding: 10px;
  background: var(--page-bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.65;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

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

.page {
  max-width: 920px;
  margin: 0 auto;
}

.float-left-image {
  float: left;
  margin: 0 18px 12px 0;
  max-width: 42%;
  height: auto;
}

.text-left {
  text-align: left;
}

@media (max-width: 720px) {
  .float-left-image {
    float: none;
    display: block;
    margin: 0 auto 14px;
    max-width: 100%;
  }
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  padding: 18px;
}

.language-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 20px;
}

.language-bar img {
  border: 1px solid #999;
}

.hero {
  margin-bottom: 24px;
}

.hero::after {
  content: "";
  display: block;
  clear: both;
}

.hero-left {
  float: left;
  width: 180px;
  max-width: 38%;
  margin: 0 18px 12px 0;
}

.hero-right {
  float: right;
  width: 154px;
  max-width: 34%;
  margin: 0 0 12px 18px;
}

.hero-meta {
  margin-top: 4px;
  font-size: 0.98rem;
}

.hero-meta p {
  margin: 0 0 10px;
}

.chapter-title {
  margin: 28px 0 10px;
  text-align: center;
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.chapter-subtitle {
  margin: 0 0 24px;
  text-align: center;
  font-size: 1.6rem;
  font-weight: 700;
}

.article p {
  margin: 0 0 16px;
  text-align: justify;
}

.figure {
  margin: 26px auto;
  text-align: center;
}

.figure img {
  margin: 0 auto 10px;
  border: 1px solid #999;
}

.caption {
  color: var(--caption);
  font-size: 0.95rem;
}

.nav-section {
  margin: 24px 0;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 12px 0;
  font-size: 1.1rem;
}

.nav-item img {
  flex: 0 0 auto;
}

.inline-icon {
  display: inline-block;
  vertical-align: middle;
  margin-right: 6px;
}

.related {
  margin: 24px 0;
  border: 1px solid #c0c0c0;
  background: var(--panel-bg);
  padding: 14px;
}

.related p {
  margin: 0 0 14px;
  text-align: justify;
}

.quote {
  color: var(--quote);
  font-style: italic;
}

.source {
  text-align: right;
  font-size: 0.92rem;
}

.footer {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid #ccc;
  text-align: center;
}

.footer img {
  margin: 0 auto;
}

@media (max-width: 720px) {
  body {
    padding: 8px;
  }

  .panel {
    padding: 14px;
  }

  .hero-left,
  .hero-right {
    float: none;
    width: auto;
    max-width: 100%;
    margin: 0 auto 16px;
  }

  .chapter-title {
    font-size: 1.18rem;
  }

  .chapter-subtitle {
    font-size: 1.35rem;
  }

  .nav-item {
    font-size: 1rem;
    align-items: flex-start;
  }
}