/* 推广活动单页 — 对齐官网 signal / copper 体系 */

.page-activity .site-header {
  --header-on-dark: 1;
}

.act-page {
  overflow: hidden;
}

.act-hero {
  position: relative;
  min-height: min(92vh, 820px);
  display: flex;
  align-items: flex-end;
  padding: calc(var(--header-h) + 48px) 0 56px;
  color: #f4f6f8;
}

.act-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.act-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 35%;
  transform: scale(1.04);
  animation: act-ken 18s var(--ease) both;
}

.act-hero-scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(10, 14, 18, 0.35) 0%, rgba(10, 14, 18, 0.55) 42%, rgba(10, 14, 18, 0.92) 100%),
    linear-gradient(90deg, rgba(8, 18, 20, 0.55) 0%, transparent 55%);
}

.act-hero-content {
  position: relative;
  z-index: 2;
  width: var(--wrap);
  margin: 0 auto;
  max-width: 720px;
  animation: act-rise 0.9s var(--ease) both;
}

.act-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, 3.4rem);
  letter-spacing: -0.03em;
  line-height: 1;
  color: #fff;
  margin-bottom: 18px;
}

.act-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.6vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  max-width: 16ch;
  margin-bottom: 14px;
}

.act-lead {
  font-size: 1.05rem;
  line-height: 1.6;
  color: rgba(244, 246, 248, 0.82);
  max-width: 36em;
  margin-bottom: 28px;
}

.act-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.act-share-hint {
  min-height: 1.4em;
  margin-top: 12px;
  font-size: 0.88rem;
  color: #5eead4;
}

.act-btn {
  appearance: none;
  border: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 10px;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.act-btn:active {
  transform: translateY(1px);
}

.act-btn-primary {
  background: var(--signal);
  color: #fff;
}

.act-btn-primary:hover {
  background: #0f766e;
}

.act-btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.act-btn-ghost:hover {
  background: rgba(255, 255, 255, 0.14);
}

.act-tracks {
  padding: 56px 0 24px;
  background: var(--bg);
}

.act-tracks-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.act-track {
  position: relative;
  padding: 28px 26px 26px;
  border-radius: 16px;
  overflow: hidden;
  color: var(--ink);
  animation: act-rise 0.8s var(--ease) both;
}

.act-track-a {
  background:
    radial-gradient(120% 80% at 100% 0%, rgba(13, 148, 136, 0.18), transparent 55%),
    var(--surface);
  border: 1px solid rgba(13, 148, 136, 0.28);
  animation-delay: 0.08s;
}

.act-track-b {
  background:
    radial-gradient(120% 80% at 0% 0%, rgba(196, 92, 38, 0.16), transparent 55%),
    var(--surface);
  border: 1px solid rgba(196, 92, 38, 0.25);
  animation-delay: 0.16s;
}

.act-track-kicker {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 10px;
}

.act-track-b .act-track-kicker {
  color: var(--copper);
}

.act-track-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--ink);
}

.act-track-reward {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
}

.act-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3rem, 8vw, 4.2rem);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.act-track-a .act-num { color: #0f766e; }
.act-track-b .act-num { color: #b45309; }

.act-unit {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
  max-width: 8em;
  line-height: 1.35;
}

.act-track-body {
  color: var(--muted);
  margin-bottom: 16px;
  max-width: 34em;
}

.act-track-submit {
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 0.95rem;
  color: var(--ink-2);
}

.act-track-submit strong {
  color: var(--ink);
}

.act-how {
  padding: 28px 0 48px;
  background: var(--bg);
}

.act-how-inner {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 28px;
}

.act-how-title,
.act-share-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 20px;
}

.act-steps {
  list-style: none;
  display: grid;
  gap: 16px;
  margin-bottom: 28px;
}

.act-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
}

.act-step-i {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: var(--signal-soft);
  color: #0f766e;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
}

.act-steps strong {
  display: block;
  color: var(--ink);
  margin-bottom: 2px;
}

.act-steps p {
  color: var(--muted);
  font-size: 0.92rem;
}

.act-contact-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 18px;
  border-radius: 12px;
  background:
    linear-gradient(135deg, rgba(13, 148, 136, 0.1), rgba(196, 92, 38, 0.08));
  border: 1px solid rgba(13, 148, 136, 0.2);
}

.act-contact-label {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--signal);
}

.act-contact-qq {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.act-contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.act-contact-actions .act-btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}

.act-contact-actions .act-btn-ghost:hover {
  border-color: var(--signal);
  background: var(--bg-elev);
}

.act-share {
  padding: 0 0 72px;
  background: var(--bg);
}

.act-share-inner {
  max-width: 720px;
}

.act-share-lead {
  color: var(--muted);
  margin-bottom: 16px;
}

.act-share-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  margin-bottom: 14px;
}

.act-url-input {
  width: 100%;
  min-height: 46px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  font: inherit;
  color: var(--ink-2);
}

.act-note {
  font-size: 0.82rem;
  color: var(--faint);
  line-height: 1.55;
}

@keyframes act-rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes act-ken {
  from { transform: scale(1.08); }
  to { transform: scale(1.02); }
}

@media (max-width: 820px) {
  .act-tracks-grid {
    grid-template-columns: 1fr;
  }
  .act-share-row {
    grid-template-columns: 1fr;
  }
  .act-hero {
    min-height: 78vh;
    align-items: flex-end;
  }
}

@media (max-width: 560px) {
  .act-hero-content {
    max-width: none;
  }
  .act-title {
    max-width: none;
  }
  .act-how-inner {
    padding: 24px 18px;
  }
  .home-act-strip-inner {
    align-items: flex-start;
  }
}