:root {
  --bg-snow: #f4f7fb;
  --bg-ice: #deebf7;
  --ink: #1f2d3d;
  --muted: #4c6073;
  --card: rgba(255, 255, 255, 0.94);
  --primary: #337ab7;
  --primary-dark: #296292;
  --border: rgba(51, 122, 183, 0.25);
}

@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;700&display=swap");

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--ink);
  background:
    linear-gradient(rgba(13, 37, 63, 0.58), rgba(13, 37, 63, 0.68)),
    url("./assets/title01.jpg") center / cover no-repeat fixed,
    linear-gradient(170deg, var(--bg-snow) 0%, var(--bg-ice) 100%);
}

.layout {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.notice-card {
  width: min(760px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-top: 6px solid var(--primary);
  border-radius: 20px;
  padding: 28px 28px 24px;
  box-shadow: 0 20px 60px rgba(20, 45, 74, 0.28);
  backdrop-filter: blur(7px);
  animation: fade-up 500ms ease-out both;
}

.label {
  margin: 0;
  letter-spacing: 0.08em;
  font-size: 12px;
  color: var(--primary-dark);
  font-weight: 700;
}

.brand-logo {
  margin-top: 12px;
  width: min(320px, 100%);
  height: auto;
  border-radius: 10px;
  border: 1px solid rgba(51, 122, 183, 0.2);
}

h1 {
  margin: 14px 0 14px;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.2;
  color: #173b5e;
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: clamp(15px, 2.6vw, 18px);
  line-height: 1.7;
}

.details {
  margin-top: 22px;
  display: grid;
  gap: 8px;
  color: #30424d;
}

.details a {
  color: var(--primary-dark);
  font-weight: 700;
}

.actions {
  margin-top: 18px;
}

button {
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  transition: transform 140ms ease, filter 140ms ease;
}

button:focus-visible {
  outline: 3px solid rgba(51, 122, 183, 0.35);
  outline-offset: 2px;
}

button:hover {
  transform: translateY(-1px);
  filter: brightness(0.92);
}

@media (max-width: 640px) {
  .notice-card {
    padding: 22px 18px;
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}