:root {
  --blue: #12aeea;
  --ink: #151515;
  --paper: #fffdf4;
  --yellow: #ffd83d;
  --pink: #ff6f9d;
  --green: #20c997;
  --muted: #5b6470;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 12%, rgba(255, 216, 61, 0.9) 0 7px, transparent 8px),
    radial-gradient(circle at 85% 88%, rgba(255, 111, 157, 0.55) 0 130px, transparent 132px),
    linear-gradient(135deg, #e8fbff 0%, #fff8dc 100%);
  color: var(--ink);
  font-family: "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

a {
  color: inherit;
}

.poster {
  width: min(1120px, calc(100% - 32px));
  min-height: min(760px, calc(100vh - 32px));
  margin: 16px auto;
  border: 5px solid var(--ink);
  background: var(--paper);
  box-shadow: 12px 12px 0 var(--ink);
  overflow: hidden;
  position: relative;
}

.poster::before,
.poster::after {
  content: "";
  position: absolute;
  z-index: 0;
  pointer-events: none;
}

.poster::before {
  inset: -80px auto auto -40px;
  width: 260px;
  aspect-ratio: 1;
  background: var(--yellow);
  border: 4px solid var(--ink);
  border-radius: 50%;
}

.poster::after {
  right: -42px;
  bottom: 130px;
  width: 180px;
  height: 180px;
  background-image: radial-gradient(var(--ink) 2px, transparent 2.5px);
  background-size: 16px 16px;
  opacity: 0.2;
}

.hero,
.details,
.message {
  position: relative;
  z-index: 1;
}

.hero {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  min-height: 480px;
  background: var(--blue);
}

.hero__copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 44px 0 38px 56px;
}

.kicker {
  align-self: flex-start;
  margin: 0 0 18px;
  padding: 8px 12px;
  border: 3px solid var(--ink);
  background: var(--yellow);
  box-shadow: 5px 5px 0 var(--ink);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 560px;
  font-size: clamp(3.1rem, 5.35vw, 4.8rem);
  line-height: 0.96;
  font-weight: 900;
  letter-spacing: 0;
}

h1 span {
  white-space: nowrap;
}

.lead {
  width: min(460px, 100%);
  margin: 24px 0 0;
  font-size: 1.05rem;
  line-height: 1.75;
  font-weight: 700;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 58px;
  padding: 0 28px;
  border: 4px solid var(--ink);
  background: var(--yellow);
  color: var(--ink);
  box-shadow: 7px 7px 0 var(--ink);
  font-size: 1.06rem;
  font-weight: 900;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  transform: translate(3px, 3px);
  box-shadow: 4px 4px 0 var(--ink);
}

.note {
  width: min(330px, 100%);
  font-size: 0.82rem;
  line-height: 1.55;
  font-weight: 900;
}

.hero__art {
  min-height: 100%;
  clip-path: polygon(13% 0, 100% 0, 100% 100%, 0 100%);
  border-left: 5px solid var(--ink);
  background: #009ed1;
}

.hero__art img {
  width: 100%;
  height: 100%;
  min-height: 480px;
  object-fit: cover;
  object-position: 52% center;
  display: block;
}

.details {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 5px solid var(--ink);
  background: var(--paper);
}

.details article {
  min-height: 142px;
  padding: 18px 18px 16px;
  border-right: 4px solid var(--ink);
}

.details article:last-child {
  border-right: 0;
}

.details span {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 8px;
  background: var(--green);
  border: 2px solid var(--ink);
  font-size: 0.7rem;
  font-weight: 900;
}

.details strong {
  display: block;
  font-size: 1rem;
  line-height: 1.45;
  font-weight: 900;
}

.details .time {
  margin-top: 7px;
}

.details .host-name {
  margin-top: 7px;
}

.venue-logo {
  display: block;
  width: min(136px, 72%);
  height: auto;
  margin: 2px 0 12px;
}

.details p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
  font-weight: 700;
}

.details .sub-detail {
  margin: 9px 0 0;
  padding: 0;
  list-style: none;
  color: var(--blue);
  font-size: 0.8rem;
  line-height: 1.5;
  font-weight: 900;
}

.details .sub-detail li {
  position: relative;
  padding-left: 0.85em;
}

.details .sub-detail li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 0.34em;
  height: 0.34em;
  border-radius: 50%;
  background: var(--blue);
  transform: translateY(-50%);
}

.details a {
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.message {
  padding: 20px 56px 24px;
  border-top: 4px solid var(--ink);
  background:
    linear-gradient(90deg, rgba(255, 216, 61, 0.62), rgba(255, 255, 255, 0)),
    var(--paper);
}

.message p {
  max-width: 920px;
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.9;
  font-weight: 700;
}

@media (max-width: 900px) {
  .poster {
    width: min(100% - 20px, 640px);
    margin: 10px auto;
    box-shadow: 7px 7px 0 var(--ink);
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero__copy {
    min-height: auto;
    padding: 42px 28px 30px;
  }

  .hero__art {
    min-height: 310px;
    border-top: 5px solid var(--ink);
    border-left: 0;
    clip-path: none;
  }

  .hero__art img {
    min-height: 310px;
    max-height: 360px;
    object-position: 58% center;
  }

  .details {
    grid-template-columns: 1fr 1fr;
  }

  .details article:nth-child(2n) {
    border-right: 0;
  }

  .details article:nth-child(n + 3) {
    border-top: 4px solid var(--ink);
  }

  .message {
    padding: 20px 28px 24px;
  }
}

@media (max-width: 560px) {
  .poster {
    border-width: 4px;
  }

  .hero__copy {
    padding: 32px 20px 26px;
  }

  h1 {
    font-size: 2.75rem;
  }

  .lead {
    font-size: 0.95rem;
    line-height: 1.8;
  }

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

  .button {
    width: 100%;
  }

  .note {
    width: 100%;
  }

  .details {
    grid-template-columns: 1fr;
  }

  .details article,
  .details article:nth-child(2n) {
    border-right: 0;
  }

  .details article:nth-child(n + 2) {
    border-top: 4px solid var(--ink);
  }
}