:root {
  color-scheme: light dark;
  --bg: #f6f8fc;
  --card-bg: rgba(255, 255, 255, 0.8);
  --text: #101623;
  --muted: #596071;
  --line: rgba(16, 22, 35, 0.1);
  --accent: #2563eb;
  --shadow: 0 16px 40px rgba(24, 39, 75, 0.12);
  --brand-icon-size: 2.25rem;
  --brand-gap: 0.65rem;
  --back-arrow-width: 1.05rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --card-bg: rgba(16, 22, 42, 0.72);
    --text: #e9eefc;
    --muted: #9aa4ba;
    --line: rgba(233, 238, 252, 0.12);
    --accent: #7aa2ff;
    --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 20% -10%, #b7d6ff 0%, transparent 35%),
    radial-gradient(circle at 85% 10%, #c7b8ff 0%, transparent 28%), var(--bg);
  color: var(--text);
  font-family: "SF Pro Text", "PingFang SC", "Helvetica Neue", sans-serif;
  line-height: 1.65;
}

.bg-orb {
  position: fixed;
  filter: blur(100px);
  opacity: 0.25;
  pointer-events: none;
}

.orb-1 {
  top: -10rem;
  left: -8rem;
  width: 22rem;
  height: 22rem;
  background: #4f8dff;
}

.orb-2 {
  right: -8rem;
  bottom: -8rem;
  width: 18rem;
  height: 18rem;
  background: #9a7bff;
}

.container {
  width: min(920px, 92vw);
  margin: 0 auto;
  padding: 3rem 0 2.5rem;
}

.hero {
  margin-bottom: 1.2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--brand-gap);
  margin-bottom: 0.8rem;
}

.brand-icon {
  width: var(--brand-icon-size);
  height: var(--brand-icon-size);
  border-radius: 0.62rem;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.18);
}

.brand-text {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-home-link {
  text-decoration: none;
  color: inherit;
}

.home-link {
  display: inline-block;
  position: relative;
  margin: 0.15rem 0 0.75rem calc(var(--brand-icon-size) + var(--brand-gap) - var(--back-arrow-width));
  padding-left: var(--back-arrow-width);
  font-size: 0.9rem;
  line-height: 1.2;
  text-decoration: none;
  color: var(--muted);
}

.home-link::before {
  content: "\2190";
  position: absolute;
  left: 0;
  top: 0;
}

.home-link:hover {
  color: var(--text);
}

.eyebrow {
  text-transform: uppercase;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0;
}

h1 {
  margin: 0.3rem 0 0.5rem;
  font-size: clamp(1.8rem, 2.7vw, 2.7rem);
  line-height: 1.2;
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

.toolbar {
  margin-top: 1.2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.2rem;
  background: var(--card-bg);
  backdrop-filter: saturate(140%) blur(10px);
}

.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 0.38rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.88rem;
}

.lang-switch button.active {
  background: var(--accent);
  color: #fff;
}

.updated {
  color: var(--muted);
  margin: 0;
  font-size: 0.9rem;
}

.card {
  background: var(--card-bg);
  backdrop-filter: saturate(150%) blur(14px);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 1.2rem 1.25rem;
  margin: 0.95rem 0;
}

h2 {
  font-size: 1.35rem;
  margin: 0.2rem 0 0.8rem;
}

h3 {
  margin-top: 1rem;
  margin-bottom: 0.3rem;
  font-size: 1.06rem;
}

p,
ul {
  margin-top: 0;
}

ul {
  padding-left: 1.1rem;
}

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

footer {
  margin-top: 1.4rem;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

.version {
  margin: 0.2rem 0 0;
  opacity: 0.9;
}

@media (max-width: 640px) {
  .container {
    padding-top: 1.8rem;
  }

  .card {
    border-radius: 14px;
    padding: 1rem;
  }
}