:root {
  --paper: #edf0f5;
  --backdrop:
    radial-gradient(38% 44% at 10% 16%, rgb(150 226 204 / 0.85), transparent 70%),
    radial-gradient(42% 46% at 90% 6%, rgb(158 194 255 / 0.9), transparent 70%),
    radial-gradient(46% 52% at 80% 90%, rgb(255 198 174 / 0.85), transparent 70%);
  --sheet: rgb(255 255 255 / 0.72);
  --edge: rgb(255 255 255 / 0.85);
  --rule: rgb(14 19 32 / 0.1);
  --shadow: inset 0 1px 0 rgb(255 255 255 / 0.95), 0 26px 60px -30px rgb(24 34 64 / 0.38);
  --ink: #0e1320;
  --ink-2: #3a4353;
  --ink-3: #566071;
  --brand: #3552d6;
  --warn: #935600;
  --warn-soft: rgb(245 158 11 / 0.16);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #060a12;
    --backdrop:
      radial-gradient(40% 46% at 12% 14%, rgb(22 160 148 / 0.48), transparent 70%),
      radial-gradient(42% 46% at 92% 4%, rgb(64 90 214 / 0.44), transparent 70%),
      radial-gradient(46% 52% at 82% 94%, rgb(214 100 62 / 0.38), transparent 70%);
    --sheet: rgb(8 13 22 / 0.62);
    --edge: rgb(255 255 255 / 0.14);
    --rule: rgb(255 255 255 / 0.1);
    --shadow: inset 0 1px 0 rgb(255 255 255 / 0.14), 0 30px 70px -30px rgb(0 0 0 / 0.75);
    --ink: #f2f5fa;
    --ink-2: #c6ceda;
    --ink-3: #9aa5b4;
    --brand: #93b1ff;
    --warn: #f6c15c;
    --warn-soft: rgb(246 193 92 / 0.12);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 24px 16px 48px;
  background: var(--backdrop), var(--paper);
  background-attachment: fixed;
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 46rem;
  margin: 0 auto;
  padding: 32px 28px 40px;
  border-radius: 30px;
  background: var(--sheet);
  border: 1px solid var(--edge);
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(28px) saturate(170%);
  backdrop-filter: blur(28px) saturate(170%);
}

@media (min-width: 640px) {
  body { padding-top: 40px; }
  main { padding: 44px 48px 52px; }
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 500;
  font-size: 17px;
  text-decoration: none;
}

.mark { display: block; width: 44px; height: 44px; }

h1 {
  margin: 28px 0 8px;
  font-size: clamp(32px, 6vw, 44px);
  line-height: 1.05;
  font-weight: 500;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.lede { margin: 0; color: var(--ink-2); font-size: 18px; }
.updated { margin: 8px 0 0; color: var(--ink-3); font-size: 14px; }

.notice {
  margin: 24px 0 0;
  padding: 14px 18px;
  border-radius: 18px;
  background: var(--warn-soft);
  color: var(--ink);
  font-size: 15px;
}

.notice strong { color: var(--warn); }

h2 {
  margin: 36px 0 8px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-size: 20px;
  line-height: 1.3;
  font-weight: 600;
  text-wrap: balance;
}

p { margin: 8px 0; color: var(--ink-2); max-width: 65ch; }
ul { margin: 8px 0; padding-left: 22px; color: var(--ink-2); max-width: 65ch; }
li { margin: 6px 0; }
strong { color: var(--ink); font-weight: 600; }
a { color: var(--brand); text-underline-offset: 3px; overflow-wrap: anywhere; }
a:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 6px; }

.todo {
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--warn-soft);
  color: var(--warn);
  font-weight: 600;
}

.back { display: inline-block; margin-top: 36px; font-weight: 500; }

.cta {
  display: inline-flex;
  align-items: center;
  margin-top: 36px;
  height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 500;
  text-decoration: none;
}

.cta:hover { opacity: 0.9; }

.cal-list { list-style: none; margin: 12px 0 0; padding: 0; max-width: none; }
.cal-item { display: grid; grid-template-columns: 4rem minmax(0, 1fr); gap: 16px; padding: 14px 0; border-top: 1px solid var(--rule); }
.cal-item:first-child { border-top: 0; }
.cal-item h3 { margin: 0; font-size: 16px; line-height: 1.4; font-weight: 600; color: var(--ink); }
.cal-item p { margin: 4px 0 0; }

.cal-date {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 64px;
  border-radius: 16px;
  background: var(--rule);
  color: var(--ink);
  font-size: 24px;
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.cal-date span { margin-top: 4px; font-size: 12px; font-weight: 500; color: var(--ink-3); }
.cal-meta { font-size: 13px; color: var(--ink-3); }

.chip {
  display: inline-block;
  margin-right: 6px;
  padding: 0 8px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-size: 12px;
  color: var(--ink-2);
}

.chip-warn { border-color: transparent; background: var(--warn-soft); color: var(--warn); font-weight: 600; }