:root {
  color-scheme: light;
  --paper: #f5f1ea;
  --ink: #1f1b17;
  --muted: #61574c;
  --accent: #b05b2f;
  --link-hover: #8f4421;
  --card: #fffdf8;
  --border: #e2d7cb;
  --shadow: rgba(31, 27, 23, 0.08);
  --header-gradient: linear-gradient(160deg, #fff4e8 0%, #f5eee4 60%, #efe4d8 100%);
  --table-head-bg: #f6efe6;
  --table-row-alt-bg: #fbf7f1;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #151310;
  --ink: #ede6dc;
  --muted: #b4a695;
  --accent: #f08f59;
  --link-hover: #ffb78e;
  --card: #201b16;
  --border: #3b3127;
  --shadow: rgba(0, 0, 0, 0.35);
  --header-gradient: linear-gradient(160deg, #2a221c 0%, #1d1813 60%, #17130f 100%);
  --table-head-bg: #2a231d;
  --table-row-alt-bg: #262019;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --paper: #151310;
    --ink: #ede6dc;
    --muted: #b4a695;
    --accent: #f08f59;
    --link-hover: #ffb78e;
    --card: #201b16;
    --border: #3b3127;
    --shadow: rgba(0, 0, 0, 0.35);
    --header-gradient: linear-gradient(160deg, #2a221c 0%, #1d1813 60%, #17130f 100%);
    --table-head-bg: #2a231d;
    --table-row-alt-bg: #262019;
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Palatino", "Georgia", serif;
  line-height: 1.6;
}

.app-header {
  padding: 28px 28px 22px;
  background: var(--header-gradient);
  border-bottom: 1px solid var(--border);
}

.app-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.app-header-content {
  flex: 1 1 auto;
  min-width: 0;
}

.app-title {
  font-family: "Avenir Next", "Avenir", "Gill Sans", sans-serif;
  font-size: 22px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink);
}

.app-nav {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
}

.app-nav a {
  font-family: "Avenir Next", "Avenir", "Gill Sans", sans-serif;
  font-size: 13px;
  text-decoration: none;
  color: var(--muted);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.app-nav a:hover {
  color: var(--ink);
  border-color: var(--border);
}

.theme-toggle {
  position: relative;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  color: var(--ink);
  border-color: var(--accent);
}

.theme-toggle:active {
  transform: scale(0.96);
}

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

.theme-icon {
  position: absolute;
  width: 18px;
  height: 18px;
  display: block;
  object-fit: contain;
  filter: brightness(0) saturate(100%);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.theme-toggle[data-theme="dark"] .theme-icon {
  filter: none;
}

.theme-icon-sun {
  opacity: 1;
  transform: scale(1);
}

.theme-icon-moon {
  opacity: 0;
  transform: scale(0.74);
}

.theme-toggle[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: scale(0.74);
}

.theme-toggle[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: scale(1);
}

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 28px 48px;
  animation: fade-in 240ms ease-out;
}

.page > h1 {
  font-family: "Avenir Next", "Avenir", "Gill Sans", sans-serif;
  font-size: 32px;
  margin-bottom: 12px;
}

h2 {
  font-family: "Avenir Next", "Avenir", "Gill Sans", sans-serif;
  font-size: 20px;
  margin-top: 28px;
  margin-bottom: 10px;
}

p {
  margin: 0 0 12px;
}

ul,
ol {
  padding-left: 20px;
  margin: 0 0 16px;
}

li {
  margin-bottom: 8px;
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 0 0 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

thead th {
  text-align: left;
  font-family: "Avenir Next", "Avenir", "Gill Sans", sans-serif;
  font-size: 13px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--table-head-bg);
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}

tbody td {
  padding: 12px 14px;
  border-top: 1px solid var(--border);
}

tbody tr:first-child td {
  border-top: none;
}

tbody tr:nth-child(even) td {
  background: var(--table-row-alt-bg);
}

a {
  color: var(--accent);
}

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

.page img {
  max-width: 100%;
  height: auto;
  border-radius: 20px;
  box-shadow: 0 8px 18px var(--shadow);
}

code {
  font-family: "SFMono-Regular", "Menlo", "Consolas", monospace;
  font-size: 0.95em;
  background: var(--card);
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid var(--border);
}

pre {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  margin: 0 0 16px;
  overflow-x: auto;
}

pre code {
  display: block;
  background: transparent;
  border: none;
  padding: 0;
  white-space: pre;
}

.app-footer {
  padding: 20px 28px 32px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 12px;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 720px) {
  .app-header {
    padding: 24px 18px 18px;
  }

  .page {
    padding: 24px 18px 40px;
  }

  .app-nav {
    gap: 8px 10px;
  }

  .theme-toggle {
    width: 34px;
    height: 34px;
  }
}