:root {
  --page-bg: #fff6e6;
  --page-surface: rgba(255, 255, 255, 0.82);
  --page-surface-strong: #fffdf7;
  --page-line: rgba(214, 152, 54, 0.16);
  --page-text: #2f1f0e;
  --page-muted: #6f5940;
  --page-brand: #d88c12;
  --page-brand-deep: #9f5d00;
  --page-brand-soft: #ffedcc;
  --page-shadow: 0 28px 70px rgba(140, 90, 16, 0.14);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Lexend", "Noto Sans SC", "PingFang SC", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 215, 145, 0.46), transparent 34%),
    linear-gradient(180deg, #fff9ef 0%, #ffe9cc 100%);
  color: var(--page-text);
}

img {
  display: block;
  max-width: 100%;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: 0;
  background: none;
  cursor: pointer;
}

.activity-shell {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
}

.activity-glow {
  position: fixed;
  border-radius: 999px;
  filter: blur(36px);
  opacity: 0.55;
  pointer-events: none;
}

.activity-glow-a {
  top: -90px;
  right: -80px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(255, 198, 92, 0.86), rgba(255, 198, 92, 0));
}

.activity-glow-b {
  left: -100px;
  bottom: 10%;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(255, 224, 174, 0.9), rgba(255, 224, 174, 0));
}

.activity-header,
.activity-main {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.activity-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  padding: 28px 0 18px;
}

.activity-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px 8px 8px;
  border-radius: 999px;
  background: rgba(255, 253, 247, 0.96);
  box-shadow: 0 18px 34px rgba(115, 72, 11, 0.12);
  font-weight: 700;
}

.activity-brand-mark {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  padding: 6px;
  background: linear-gradient(180deg, #fffdf7, #fff0d1);
  box-shadow: 0 12px 26px rgba(115, 72, 11, 0.14);
}

.activity-brand img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.activity-brand-copy {
  display: grid;
  gap: 2px;
}

.activity-brand-text {
  display: block;
  letter-spacing: 0.03em;
}

.activity-brand-note {
  display: block;
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--page-brand-deep);
}

.activity-main {
  padding-bottom: 56px;
}

.activity-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.14fr) minmax(300px, 380px);
  gap: 22px;
  align-items: start;
}

.activity-copy,
.activity-prize-card,
.activity-poster-card,
.activity-section {
  background: var(--page-surface);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--page-line);
  box-shadow: var(--page-shadow);
}

.activity-copy {
  border-radius: 34px;
  padding: 34px;
}

.activity-copy h1,
.activity-section-head h2,
.activity-prize-card h2 {
  margin: 0;
  line-height: 1.08;
}

.activity-copy h1 {
  font-size: clamp(2.4rem, 4vw, 4.4rem);
}

.activity-lead {
  margin: 16px 0 0;
  max-width: 640px;
  font-size: 1rem;
  line-height: 1.72;
  color: var(--page-muted);
}

.activity-actions {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.activity-primary,
.activity-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.activity-primary {
  background: linear-gradient(135deg, #eea117 0%, #c97100 100%);
  color: #fff9f0;
  box-shadow: 0 18px 32px rgba(201, 113, 0, 0.28);
}

.activity-secondary {
  background: rgba(255, 255, 255, 0.88);
  color: var(--page-brand-deep);
  border: 1px solid rgba(176, 113, 21, 0.22);
}

.activity-primary:hover,
.activity-secondary:hover,
.activity-poster-button:hover {
  transform: translateY(-1px);
}

.activity-metrics {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.activity-metrics article {
  padding: 16px 14px;
  border-radius: 20px;
  background: rgba(255, 251, 241, 0.92);
  border: 1px solid rgba(216, 140, 18, 0.14);
}

.activity-metrics strong {
  display: block;
  font-size: 1.15rem;
}

.activity-metrics span {
  display: block;
  margin-top: 6px;
  color: var(--page-muted);
  font-size: 0.92rem;
}

.activity-priority-card {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.activity-priority-card article {
  padding: 16px;
  border-radius: 22px;
  background: rgba(255, 251, 241, 0.9);
  border: 1px solid rgba(216, 140, 18, 0.12);
}

.activity-priority-card span {
  display: block;
  font-size: 0.8rem;
  color: var(--page-brand);
  font-weight: 700;
}

.activity-priority-card strong {
  display: block;
  margin-top: 8px;
  font-size: 0.98rem;
  line-height: 1.55;
}

.activity-rule-strip {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(255, 237, 204, 0.96), rgba(255, 247, 231, 0.88));
  border: 1px solid rgba(216, 140, 18, 0.16);
}

.activity-rule-strip strong {
  color: var(--page-brand-deep);
  white-space: nowrap;
}

.activity-rule-strip p {
  margin: 0;
  color: var(--page-brand-deep);
  font-weight: 600;
  line-height: 1.6;
}

.activity-side-stack {
  display: grid;
  gap: 16px;
  align-content: start;
}

.activity-prize-card {
  padding: 24px;
  border-radius: 32px;
  background:
    linear-gradient(135deg, rgba(255, 240, 209, 0.95), rgba(255, 252, 245, 0.95));
  border: 1px solid rgba(216, 140, 18, 0.18);
}

.activity-prize-label {
  margin: 0 0 8px;
  color: var(--page-brand);
  font-weight: 700;
}

.activity-prize-card h2 {
  font-size: clamp(1.6rem, 2.4vw, 2.35rem);
}

.activity-prize-card p {
  margin: 14px 0 0;
  color: var(--page-muted);
  line-height: 1.72;
}

.activity-claim-inline {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.activity-claim-inline span {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  color: var(--page-brand-deep);
  font-size: 0.88rem;
  font-weight: 700;
}

.activity-poster-card {
  border-radius: 28px;
  padding: 16px;
}

.activity-poster-button {
  width: 100%;
  padding: 0;
}

.activity-poster-button-inline {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  text-align: left;
}

.activity-poster {
  width: 100%;
  border-radius: 24px;
  box-shadow: 0 16px 40px rgba(100, 70, 20, 0.12);
}

.activity-poster-compact {
  height: 148px;
  object-fit: cover;
  object-position: top center;
  border-radius: 20px;
}

.activity-poster-copy strong {
  display: block;
  font-size: 1rem;
}

.activity-poster-copy p {
  margin: 8px 0 0;
  color: var(--page-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

.activity-poster-meta {
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--page-muted);
}

.activity-poster-meta a {
  color: var(--page-brand-deep);
  font-weight: 600;
}

.activity-section {
  margin-top: 20px;
  border-radius: 32px;
  padding: 24px;
}

.activity-section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.activity-section-head h2 {
  font-size: clamp(1.6rem, 2.3vw, 2.4rem);
}

.activity-task-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.activity-task-card {
  padding: 22px;
  border-radius: 24px;
  background: var(--page-surface-strong);
  border: 1px solid rgba(216, 140, 18, 0.12);
}

.activity-task-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.activity-task-head h3 {
  margin: 0;
  font-size: 1.15rem;
}

.activity-task-head span {
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--page-brand-soft);
  color: var(--page-brand-deep);
  font-size: 0.85rem;
  font-weight: 700;
}

.activity-task-card p {
  margin: 16px 0 0;
  color: var(--page-muted);
  line-height: 1.75;
}

.activity-tag-list {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.activity-tag-list span {
  padding: 9px 14px;
  border-radius: 999px;
  background: rgba(241, 162, 8, 0.1);
  color: var(--page-brand-deep);
  font-size: 0.9rem;
  font-weight: 600;
}

.activity-section-muted {
  background: rgba(255, 248, 232, 0.9);
}

.activity-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.activity-steps article {
  display: flex;
  gap: 16px;
  padding: 20px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(216, 140, 18, 0.1);
}

.activity-steps strong {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, #f1a208, #d07a00);
  color: white;
}

.activity-steps h3 {
  margin: 0;
  font-size: 1.05rem;
}

.activity-steps p {
  margin: 10px 0 0;
  color: var(--page-muted);
  line-height: 1.75;
}

.activity-lightbox[hidden] {
  display: none;
}

.activity-lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
}

.activity-lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(32, 21, 8, 0.76);
  backdrop-filter: blur(8px);
}

.activity-lightbox-panel {
  position: relative;
  z-index: 1;
  width: min(92vw, 720px);
  max-height: calc(100vh - 80px);
  margin: 40px auto;
  padding: 14px;
  border-radius: 28px;
  background: rgba(255, 252, 246, 0.96);
  box-shadow: 0 34px 80px rgba(0, 0, 0, 0.24);
}

.activity-lightbox-panel img {
  width: 100%;
  max-height: calc(100vh - 108px);
  object-fit: contain;
  border-radius: 18px;
}

.activity-lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 2;
  min-width: 64px;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--page-brand-deep);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.16);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 960px) {
  .activity-hero,
  .activity-task-grid,
  .activity-steps {
    grid-template-columns: 1fr;
  }

  .activity-copy,
  .activity-prize-card,
  .activity-poster-card,
  .activity-section {
    border-radius: 26px;
  }
}

@media (max-width: 720px) {
  .activity-header,
  .activity-main {
    width: min(100%, calc(100% - 24px));
  }

  .activity-header {
    padding: 16px 0 12px;
    flex-wrap: wrap;
  }

  .activity-copy,
  .activity-prize-card,
  .activity-poster-card,
  .activity-section {
    padding: 18px;
  }

  .activity-copy h1 {
    font-size: 2.1rem;
  }

  .activity-lead {
    margin-top: 12px;
    font-size: 0.95rem;
    line-height: 1.62;
  }

  .activity-actions,
  .activity-poster-meta,
  .activity-section-head {
    flex-direction: column;
    align-items: stretch;
  }

  .activity-metrics {
    margin-top: 18px;
    gap: 8px;
  }

  .activity-metrics article {
    padding: 12px 10px;
    border-radius: 16px;
  }

  .activity-metrics strong {
    font-size: 1rem;
  }

  .activity-metrics span {
    margin-top: 4px;
    font-size: 0.78rem;
  }

  .activity-priority-card {
    margin-top: 14px;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .activity-priority-card article {
    padding: 14px;
    border-radius: 18px;
  }

  .activity-rule-strip {
    margin-top: 12px;
    padding: 12px 14px;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .activity-actions {
    margin-top: 16px;
    gap: 10px;
  }

  .activity-primary,
  .activity-secondary {
    width: 100%;
    min-height: 46px;
  }

  .activity-poster-meta {
    gap: 8px;
  }

  .activity-poster-button-inline {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 12px;
  }

  .activity-poster-compact {
    height: 124px;
    border-radius: 18px;
  }

  .activity-poster-copy p {
    font-size: 0.88rem;
  }

  .activity-prize-card h2 {
    font-size: 1.55rem;
  }

  .activity-claim-inline {
    gap: 8px;
  }

  .activity-claim-inline span {
    width: 100%;
    justify-content: center;
  }

  .activity-section {
    margin-top: 16px;
  }

  .activity-section-head {
    gap: 10px;
    margin-bottom: 16px;
  }

  .activity-section-head h2 {
    font-size: 1.45rem;
  }

  .activity-task-card,
  .activity-steps article {
    padding: 18px;
    border-radius: 22px;
  }

  .activity-tag-list {
    margin-top: 14px;
    gap: 8px;
  }

  .activity-tag-list span {
    padding: 8px 12px;
    font-size: 0.84rem;
  }

  .activity-lightbox-panel {
    width: calc(100vw - 16px);
    margin: 56px auto 16px;
    padding: 10px;
  }

  .activity-lightbox-close {
    right: 12px;
    top: 12px;
  }
}