* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --app-safe-bottom: env(safe-area-inset-bottom, 0px);
  --bg: #f5f1e8;
  --bg-start: #fbf8ef;
  --bg-end: #e8f3ef;
  --glow: rgba(106, 189, 180, 0.35);
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: #ffffff;
  --ink: #17201d;
  --body-text: #34413d;
  --muted: #66736f;
  --accent: #23786e;
  --accent-soft: #dcefeb;
  --border: rgba(35, 120, 110, 0.18);
  --notice-text: #31403c;
  --notice-bg: rgba(220, 239, 235, 0.72);
  --menu-scrim: rgba(19, 32, 29, 0.18);
  --shadow: 0 24px 80px rgba(32, 62, 57, 0.14);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #08100e;
  --bg-start: #091311;
  --bg-end: #101b18;
  --glow: rgba(120, 212, 202, 0.16);
  --surface: rgba(18, 30, 27, 0.92);
  --surface-strong: #13211e;
  --ink: #eff8f5;
  --body-text: #d3dfdb;
  --muted: #9fb2ad;
  --accent: #78d4ca;
  --accent-soft: rgba(120, 212, 202, 0.18);
  --border: rgba(120, 212, 202, 0.2);
  --notice-text: #d8f4ef;
  --notice-bg: rgba(35, 120, 110, 0.18);
  --menu-scrim: rgba(0, 0, 0, 0.42);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family:
    ui-sans-serif,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background:
    radial-gradient(circle at top left, var(--glow), transparent 34rem),
    linear-gradient(135deg, var(--bg-start) 0%, var(--bg) 42%, var(--bg-end) 100%);
  transition: background 220ms ease, color 220ms ease;
}

a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 calc(52px + var(--app-safe-bottom));
}

.hero {
  position: relative;
  overflow: hidden;
  margin-bottom: 18px;
  padding: 30px;
  border: 1px solid var(--border);
  border-radius: 30px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero::after {
  position: absolute;
  right: -72px;
  bottom: -92px;
  width: 220px;
  height: 220px;
  border-radius: 999px;
  background: var(--accent-soft);
  content: "";
}

.topbar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 26px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background:
    radial-gradient(circle at 34% 30%, #fff 0 12%, transparent 13%),
    linear-gradient(135deg, #2d9287, #6abdb4);
  box-shadow: 0 10px 24px rgba(35, 120, 110, 0.28);
}

.language-picker {
  position: relative;
  z-index: 5;
}

.language-button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  min-width: 156px;
  gap: 12px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink);
  background: var(--surface-strong);
  font: inherit;
  font-weight: 700;
  box-shadow: 0 10px 28px rgba(32, 62, 57, 0.08);
}

.language-button::after {
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  opacity: 0.7;
  content: "";
}

.language-button[aria-expanded="true"]::after {
  transform: translateY(2px) rotate(225deg);
}

.language-scrim {
  position: fixed;
  inset: 0;
  z-index: 9;
  display: none;
  background: var(--menu-scrim);
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 10;
  display: none;
  min-width: 220px;
  overflow: hidden;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--surface-strong);
  box-shadow: var(--shadow);
}

.language-picker[data-open="true"] .language-menu,
.language-picker[data-open="true"] .language-scrim {
  display: block;
}

.language-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 12px 14px;
  border: 0;
  border-radius: 16px;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-weight: 750;
  text-align: left;
}

.language-option:hover,
.language-option:focus-visible {
  outline: none;
  background: var(--accent-soft);
}

.language-option[data-selected="true"] {
  color: var(--accent);
  background: var(--accent-soft);
}

.language-option[data-selected="true"]::after {
  content: "✓";
  font-weight: 900;
}

h1 {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0;
  font-size: clamp(2rem, 7vw, 4.6rem);
  line-height: 0.95;
  letter-spacing: -0.055em;
}

.updated {
  position: relative;
  z-index: 1;
  margin: 18px 0 0;
  color: var(--muted);
  font-weight: 700;
}

.notice,
.content {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: 0 16px 50px rgba(32, 62, 57, 0.08);
}

.notice {
  margin-bottom: 18px;
  padding: 18px 20px;
  color: var(--notice-text);
  background: var(--notice-bg);
  font-weight: 700;
}

.content {
  padding: 8px 26px 28px;
}

section {
  padding-top: 22px;
}

h2 {
  margin: 0 0 10px;
  font-size: 1.08rem;
  letter-spacing: -0.02em;
}

p,
li {
  color: var(--body-text);
  line-height: 1.72;
}

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

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --bg: #08100e;
    --bg-start: #091311;
    --bg-end: #101b18;
    --glow: rgba(120, 212, 202, 0.16);
    --surface: rgba(18, 30, 27, 0.92);
    --surface-strong: #13211e;
    --ink: #eff8f5;
    --body-text: #d3dfdb;
    --muted: #9fb2ad;
    --accent: #78d4ca;
    --accent-soft: rgba(120, 212, 202, 0.18);
    --border: rgba(120, 212, 202, 0.2);
    --notice-text: #d8f4ef;
    --notice-bg: rgba(35, 120, 110, 0.18);
    --menu-scrim: rgba(0, 0, 0, 0.42);
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  }
}

@media (max-width: 600px) {
  .page {
    width: min(100% - 20px, 960px);
    padding-top: 12px;
  }

  .hero {
    padding: 22px;
    border-radius: 24px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .language-picker,
  .language-button {
    width: 100%;
  }

  .language-menu {
    position: fixed;
    right: 12px;
    bottom: calc(12px + var(--app-safe-bottom));
    left: 12px;
    top: auto;
    max-height: calc(100dvh - 24px - var(--app-safe-bottom));
    overflow-y: auto;
    border-radius: 26px;
  }

  .content {
    padding: 4px 18px 22px;
  }
}