:root {
  color-scheme: light dark;
  --bg: #f1eee8;
  --bg-gradient: radial-gradient(circle at 10% 10%, #ffffff 0%, #f1eee8 45%, #e5e1d9 100%);
  --panel: #ffffff;
  --panel-border: #d9d2c4;
  --text: #171615;
  --muted: #59544c;
  --accent: #11465a;
  --accent-soft: #e5f0f4;
  --link: #0f4f71;
  --link-hover: #083852;
  --shadow: 0 14px 38px -26px rgba(20, 18, 15, 0.45);
  --todo-bg: #fff0b8;
  --todo-border: #d98f00;
  --todo-text: #6f4300;
  --max-width: 880px;
  --radius: 16px;
  --font-body: "Segoe UI Variable Text", "Segoe UI", "Noto Sans", "Liberation Sans", sans-serif;
  --font-heading: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, "Times New Roman", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141517;
    --bg-gradient: radial-gradient(circle at 10% 10%, #1d2024 0%, #141517 45%, #0f1012 100%);
    --panel: #1a1d21;
    --panel-border: #2b3036;
    --text: #ece9e2;
    --muted: #b4ada1;
    --accent: #83bfd8;
    --accent-soft: #1b2f38;
    --link: #9dd7f2;
    --link-hover: #c2e8fb;
    --shadow: 0 18px 42px -28px rgba(0, 0, 0, 0.62);
    --todo-bg: #48380f;
    --todo-border: #c8972d;
    --todo-text: #f5dc96;
  }
}

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

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  line-height: 1.7;
  background: var(--bg-gradient);
  color: var(--text);
}

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

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 0.5rem 0.8rem;
  z-index: 99;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

.page-shell {
  width: min(100% - 2.25rem, var(--max-width));
  margin: 1.4rem auto 2.5rem;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.2rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  color: var(--accent);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.brand-mark svg {
  width: 30px;
  height: 30px;
  stroke: currentColor;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.sr-only {
  border: 0;
  clip: rect(0, 0, 0, 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.nav-list a {
  display: inline-block;
  padding: 0.46rem 0.72rem;
  border-radius: 9px;
  border: 1px solid var(--panel-border);
  text-decoration: none;
  color: var(--text);
  background: var(--panel);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--text);
}

.nav-list a[aria-current="page"] {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.lang-switch {
  display: inline-flex;
  gap: 0.45rem;
  align-items: center;
  font-size: 0.95rem;
  color: var(--muted);
}

.lang-active {
  font-weight: 700;
  color: var(--text);
}

.content {
  margin-bottom: 1.25rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.55rem 1.45rem;
}

h1,
h2,
h3 {
  font-family: var(--font-heading);
  line-height: 1.24;
  letter-spacing: 0.01em;
  margin-top: 0;
}

h1 {
  margin-bottom: 0.72rem;
  font-size: clamp(1.65rem, 4.6vw, 2.2rem);
}

h2 {
  margin-top: 1.7rem;
  margin-bottom: 0.45rem;
  font-size: clamp(1.23rem, 3.2vw, 1.5rem);
}

h3 {
  margin-top: 1.2rem;
  margin-bottom: 0.4rem;
  font-size: 1.1rem;
}

p,
li {
  margin: 0.45rem 0;
}

ul,
ol {
  padding-left: 1.2rem;
}

.lede {
  font-size: 1.06rem;
  color: var(--muted);
}

.quick-links {
  margin-top: 1.15rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.7rem;
}

.quick-links a {
  display: block;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 0.95rem 0.9rem;
  background: var(--panel);
  text-decoration: none;
  color: var(--text);
}

.quick-links a span {
  display: block;
  color: var(--muted);
  font-size: 0.93rem;
}

.quick-links a:hover,
.quick-links a:focus-visible {
  background: var(--accent-soft);
}

.notice {
  margin-top: 1.35rem;
  padding: 0.95rem;
  border-radius: 12px;
  border: 1px solid var(--todo-border);
  background: var(--todo-bg);
}

.todo {
  display: inline-block;
  padding: 0.08rem 0.36rem;
  border-radius: 6px;
  border: 1px solid var(--todo-border);
  background: var(--todo-bg);
  color: var(--todo-text);
  font-weight: 700;
  font-size: 0.93rem;
  white-space: nowrap;
}

.site-footer {
  padding: 0.6rem 0.25rem 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.site-footer p {
  margin: 0.26rem 0;
}

.meta-list {
  margin: 0.5rem 0 0;
  padding: 0;
  list-style: none;
}

.meta-list li {
  margin: 0.34rem 0;
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 1.25rem, var(--max-width));
    margin-top: 0.9rem;
  }

  .site-header {
    align-items: flex-start;
  }

  .panel {
    padding: 1.2rem 1.05rem;
  }
}