:root {
  color-scheme: light;
  --bg: #f4f3ef;
  --text: #202124;
  --heading: #171717;
  --heading-soft: #1f1f1f;
  --muted: #585d64;
  --muted-strong: #4f5560;
  --link: #1f4e8c;
  --link-border: #b6c8e3;
  --border: #d9d7cf;
  --border-soft: #e3e1d9;
  --border-accent: #d3d0c6;
  --surface: #faf9f5;
  --image-bg: #ffffff;
  --media-bg: #000000;
  --shadow: 0 10px 24px rgba(24, 29, 38, 0.08);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #11161d;
  --text: #e4e0d8;
  --heading: #f2eee7;
  --heading-soft: #ebe6dc;
  --muted: #b3bac6;
  --muted-strong: #c3c9d2;
  --link: #8eb3ea;
  --link-border: #49668e;
  --border: #343c48;
  --border-soft: #2a313c;
  --border-accent: #47515f;
  --surface: #171d25;
  --image-bg: #ffffff;
  --media-bg: #05070b;
  --shadow: 0 14px 28px rgba(0, 0, 0, 0.28);
}

html,
body {
  min-height: 100%;
}

body {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Times New Roman", serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  transition: background-color 0.28s ease, color 0.28s ease;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 18px 18px 34px;
}

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid var(--link-border);
  transition: color 0.28s ease, border-color 0.28s ease;
}

a:hover {
  border-bottom-color: var(--link);
}

.back {
  margin: 0 0 10px;
  font-size: 0.94rem;
}

.page-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 14px;
  transition: border-color 0.28s ease;
}

h1 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--heading);
}

.meta {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.section {
  border-bottom: 1px solid var(--border-soft);
  padding: 12px 0 14px;
  transition: border-color 0.28s ease;
}

.section:last-of-type {
  border-bottom: 0;
}

h2 {
  margin: 0 0 8px;
  font-size: 1.4rem;
  line-height: 1.2;
  color: var(--heading);
}

h3 {
  margin: 16px 0 7px;
  font-size: 1.12rem;
  line-height: 1.2;
  color: var(--heading-soft);
}

p {
  margin: 0 0 8px;
  line-height: 1.5;
  font-size: 1rem;
}

ul {
  margin: 0 0 8px 20px;
  padding: 0;
}

li {
  margin: 3px 0;
}

.theme-toggle {
  position: fixed;
  top: 16px;
  right: 18px;
  z-index: 50;
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted-strong);
  border-radius: 999px;
  padding: 7px 12px;
  font: inherit;
  font-size: 0.92rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: background-color 0.28s ease, color 0.28s ease, border-color 0.28s ease, transform 0.18s ease, box-shadow 0.28s ease;
}

.theme-toggle:hover {
  color: var(--heading);
  border-color: var(--link);
  transform: translateY(-1px);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

@media (max-width: 860px) {
  .container {
    padding: 14px 14px 22px;
  }

  h1 {
    font-size: 1.62rem;
  }

  .theme-toggle {
    top: 12px;
    right: 12px;
    padding: 6px 10px;
    font-size: 0.88rem;
  }
}