.xipu.page {
  max-width: 1500px;
  padding-bottom: 32px;
}

.xipu-lesson {
  transition: opacity .65s ease, transform .65s ease;
}

.xipu-step { display: none; }
.xipu-step.active { display: block; animation: xipu-step-in .45s ease both; }
@keyframes xipu-step-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.xipu-intro-nav { margin-top: 28px; }
.xipu-intro-nav > span { color: var(--muted); font-size: 13px; }

.xipu-knowledge {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  max-width: 900px;
  margin: 30px auto 18px;
}

.xipu-knowledge article {
  min-height: 205px;
  border: 1px solid var(--line);
  position: relative;
  padding: 18px;
  background: rgba(255,255,255,.08);
  overflow: hidden;
}

.xipu-knowledge img {
  display: block;
  width: 100%;
  height: 112px;
  object-fit: contain;
  background: transparent;
  pointer-events: none;
}

.xipu-knowledge article:nth-child(1) img { transform: scale(.72); }
.xipu-knowledge article:nth-child(2) img { transform: scale(.7); }
.xipu-knowledge article:nth-child(4) img { transform: scale(.82); }

.xipu-token {
  position: absolute;
  top: 14px;
  left: 16px;
  color: var(--red);
  font-size: 30px;
  line-height: 1;
}

.xipu-knowledge strong { font-size: 17px; font-weight: 500; }
.xipu-knowledge p { color: var(--muted); font-size: 12px; line-height: 1.65; margin: 5px 0 0; }
.xipu-bridge { color: var(--muted); font-size: 14px; margin: 16px 0 52px; }

.xipu-score-head {
  border-top: 1px solid var(--line);
  padding-top: 30px;
}

.xipu-score-head span { color: var(--red); font: 11px system-ui; letter-spacing: .18em; }
.xipu-score-head h2 { font-size: 34px; font-weight: 500; margin: 5px 0; }
.xipu-score-head p { color: var(--muted); font-size: 12px; line-height: 1.6; }

.xipu-score {
  display: flex;
  align-items: stretch;
  gap: 8px;
  margin: 28px 0 18px;
  overflow-x: auto;
  padding: 3px 2px 15px;
}

.score-measure {
  display: flex;
  min-width: 180px;
  border-left: 1px solid rgba(23,23,19,.35);
  border-right: 1px solid rgba(23,23,19,.35);
  position: relative;
}

.score-measure.short { min-width: 104px; }
.score-measure.repeat-copy:before {
  content: "反复";
  position: absolute;
  top: -18px;
  right: 4px;
  color: var(--muted);
  font: 9px system-ui;
}

.score-event {
  flex: var(--duration) 0 0;
  min-width: calc(42px * var(--duration));
  height: 78px;
  display: grid;
  place-items: center;
  position: relative;
  font-size: 30px;
  transition: color .18s ease, background .18s ease;
}

.score-event:after {
  content: "";
  position: absolute;
  left: 18%; right: 18%; bottom: 8px;
  height: 1px;
  background: transparent;
}

.score-event.half { font-size: 24px; min-width: 28px; }
.score-event.active { color: var(--red); background: rgba(178,53,44,.075); }
.score-event.active:after { background: var(--red); }
.score-event.done { color: rgba(23,23,19,.38); }

.xipu-actions { display: flex; justify-content: flex-end; gap: 12px; margin-bottom: 20px; }
.xipu-actions button { min-width: 128px; }
.xipu-actions button.running { border-color: var(--red); color: var(--red); }

.xipu-performance-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
}

.xipu-slot {
  min-height: 205px;
  position: relative;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  overflow: hidden;
  background: rgba(255,255,255,.1);
}

.xipu-slot .corner { left: 12px; top: 10px; }
.xipu-slot img { width: 100%; height: 145px; object-fit: contain; display: block; background: transparent; }
.xipu-slot[data-instrument="danpigu"] img { transform: scale(.78); }
.xipu-slot[data-instrument="daluo"] img { transform: scale(.72); }
.xipu-slot[data-instrument="xiaoluo"] img { transform: scale(.7); }
.xipu-slot strong { display: block; text-align: center; font-weight: 500; margin-top: -10px; }
.xipu-slot.active { border-color: var(--red); }
.xipu-slot.active img { transform: scale(.92); }

.xipu-progress {
  display: grid;
  grid-template-columns: minmax(190px, 1fr) minmax(180px, 360px) 50px;
  align-items: center;
  gap: 16px;
  color: var(--muted);
  font: 11px system-ui;
  padding: 16px 0 4px;
}

.xipu-progress > div { height: 2px; background: var(--line); }
.xipu-progress i { display: block; width: 0; height: 100%; background: var(--red); transition: width .25s ease; }
.xipu-progress strong { color: var(--ink); font-weight: 500; text-align: right; }

.xipu-purpose {
  text-align: center;
  padding: 34px 20px 28px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity .7s ease, transform .7s ease;
}
.xipu-purpose strong { display: block; color: var(--red); font-size: 24px; font-weight: 500; letter-spacing: .08em; }
.xipu-purpose p { color: var(--muted); font-size: 14px; margin: 10px 0 0; }
.xipu.purpose-visible .xipu-purpose { opacity: 1; visibility: visible; transform: none; }
.xipu.purpose-leaving .xipu-purpose { opacity: 0; transform: translateY(-8px); }
.xipu.purpose-visible .xipu-actions { pointer-events: none; opacity: .45; }

.xipu-reveal {
  display: none;
  min-height: calc(100vh - 138px);
  flex-direction: column;
  opacity: 0;
  transition: opacity .7s ease;
}

.xipu.is-completing .xipu-lesson { opacity: 0; transform: translateY(-8px); }
.xipu.is-revealed .xipu-lesson { display: none; }
.xipu.is-revealed .xipu-reveal { display: flex; }
.xipu.is-revealed.reveal-visible .xipu-reveal { opacity: 1; }
.xipu-reveal > .bottom-bar { opacity: 0; transform: translateY(8px); transition: opacity .7s ease 1.1s, transform .7s ease 1.1s; }
.show-full .xipu-reveal > .bottom-bar { opacity: 1; transform: none; }

.dulinian-stage {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(320px, .9fr) minmax(320px, 1fr);
  align-items: center;
  max-width: 1050px;
  width: 100%;
  margin: auto;
  gap: clamp(30px, 7vw, 110px);
}

.dulinian-figure { height: min(68vh, 720px); position: relative; }
.dulinian-figure img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; background: transparent; transition: opacity 1.5s ease; }
.dulinian-silhouette { opacity: 0; }
.dulinian-full { opacity: 0; }
.show-silhouette .dulinian-silhouette { opacity: 1; }
.show-full .dulinian-silhouette { opacity: 0; }
.show-full .dulinian-full { opacity: 1; }

.dulinian-stage blockquote { margin: 0; opacity: 0; transform: translateY(10px); transition: opacity 1.2s ease .35s, transform 1.2s ease .35s; }
.show-full .dulinian-stage blockquote { opacity: 1; transform: none; }
.dulinian-stage blockquote p { font-size: clamp(34px, 4.4vw, 62px); line-height: 1.45; margin: 0 0 22px; font-weight: 400; }
.dulinian-stage cite { color: var(--red); font-style: normal; font-size: 14px; letter-spacing: .15em; }

@media (max-width: 850px) {
  .xipu-knowledge { grid-template-columns: 1fr 1fr; }
  .xipu-performance-grid { grid-template-columns: 1fr 1fr; }
  .dulinian-stage { grid-template-columns: 1fr 1fr; gap: 20px; }
}

@media (max-width: 560px) {
  .xipu-knowledge { grid-template-columns: 1fr; }
  .xipu-performance-grid { grid-template-columns: 1fr 1fr; }
  .xipu-slot { min-height: 165px; }
  .xipu-slot img { height: 110px; }
  .xipu-progress { grid-template-columns: 1fr 46px; }
  .xipu-progress > span { grid-column: 1 / -1; }
  .dulinian-stage { grid-template-columns: 1fr; text-align: center; }
  .dulinian-figure { height: 52vh; }
  .dulinian-stage blockquote p { font-size: 32px; }
}