/**
 * 第四章 — 四层关系探索
 */

.poet-relationship {
  position: relative;
  z-index: 4;
  isolation: isolate;
  overflow: visible;
  background: var(--color-bg);
}

.poet-relationship__explore-host {
  position: relative;
  z-index: 1;
  min-height: clamp(26rem, 82vh, 48rem);
  background: var(--color-bg);
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity 0.85s ease, transform 0.85s ease;
}

.poet-relationship__explore-host.is-revealed {
  opacity: 1;
  transform: none;
}

.poet-relationship__intro {
  position: relative;
  z-index: 2;
  padding-bottom: 14vh;
}

.poet-relationship__intro .reading-prose__inner {
  max-width: 36rem;
}

.poet-relationship__intro .reading-reveal {
  margin: 0;
}

.poet-relationship__intro .reading-prose__inner p.reading-reveal {
  margin-top: 1.35rem;
}

.pr-explore.is-loading .pr-explore__stage {
  opacity: 0.35;
}

.pr-explore.is-loading .pr-explore__guide {
  color: var(--color-text-muted);
}

.pr-explore.is-ready .pr-explore__stage {
  opacity: 1;
  transition: opacity 0.6s ease;
}

.pr-explore {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: clamp(28rem, 82vh, 50rem);
  padding: var(--space-md) var(--space-md) var(--space-lg);
  overflow: hidden;
  background: var(--color-bg);
}

/* —— 极轻雨意 —— */
.pr-explore__rain {
  pointer-events: none;
  position: absolute;
  inset: 0;
  opacity: 0.55;
  background-image: repeating-linear-gradient(
    108deg,
    transparent 0,
    transparent 11px,
    rgba(120, 128, 136, 0.025) 11px,
    rgba(120, 128, 136, 0.025) 12px
  );
  mask-image: radial-gradient(ellipse 90% 80% at 50% 40%, #000 20%, transparent 78%);
  transition: opacity 0.9s ease;
}

.pr-explore[data-layer='4'] .pr-explore__rain {
  opacity: 0.12;
}

/* —— 图上方：面包屑 + 引导 —— */
.pr-explore__head {
  position: relative;
  z-index: 5;
  flex: 0 0 auto;
  max-width: 52rem;
  margin: 0 auto var(--space-xs);
  text-align: center;
}

.pr-explore__path {
  margin-bottom: 0.35rem;
}

.pr-explore__path-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.35rem 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--font-size-xs);
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
}

.pr-explore__path-list li:not(:last-child)::after {
  content: '/';
  margin-left: 0.5rem;
  opacity: 0.45;
}

.pr-explore__path-btn {
  border: none;
  background: none;
  padding: 0;
  font: inherit;
  color: inherit;
  cursor: pointer;
  transition: color 0.25s ease;
}

.pr-explore__path-btn:hover:not(.is-current) {
  color: var(--color-text-muted);
}

.pr-explore__path-btn.is-current {
  color: var(--color-text);
  cursor: default;
}

.pr-explore__guide {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  min-height: 1.35em;
}

/* —— 图下方：层说明 —— */
.pr-explore__foot {
  position: relative;
  z-index: 5;
  flex: 0 0 auto;
  max-width: 52rem;
  width: 100%;
  margin: var(--space-sm) auto 0;
  padding-bottom: 0.25rem;
  text-align: center;
}

.pr-explore__caption {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  letter-spacing: 0.1em;
  color: var(--color-text);
  min-height: 1.35em;
}

.pr-explore[data-layer='1'] .pr-explore__foot {
  visibility: hidden;
  min-height: 0;
  margin-top: 0;
  padding-bottom: 0;
}

.pr-explore__layer3-copy {
  margin-top: 0.35rem;
}

.pr-explore__layer3-lead {
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin: 0 0 0.25rem;
}

.pr-explore__layer3-meta {
  font-size: var(--font-size-xs);
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  margin: 0;
}

.pr-explore__expand {
  display: inline-block;
  margin: 0.45rem auto 0;
  border: none;
  background: none;
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  transition: color 0.2s ease;
}

.pr-explore__expand[hidden],
.pr-explore[data-layer='1'] .pr-explore__expand,
.pr-explore[data-layer='3'] .pr-explore__expand,
.pr-explore[data-layer='4'] .pr-explore__expand {
  display: none;
}

.pr-explore__expand:hover:not(:disabled) {
  color: var(--color-text);
}

.pr-explore__expand:disabled {
  opacity: 0.45;
  cursor: default;
}

/* —— 舞台 —— */
.pr-explore__stage-wrap {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  max-width: 62rem;
  width: 100%;
  margin: 0 auto;
  min-height: 0;
}

.pr-explore[data-layer='2'] {
  min-height: clamp(34rem, 92vh, 58rem);
}

.pr-explore[data-layer='2'] .pr-explore__stage-wrap {
  max-width: min(78rem, 96vw);
}

.pr-explore[data-layer='2'] .pr-explore__stage-viewport {
  min-height: clamp(28rem, 78vh, 52rem);
  max-height: clamp(28rem, 78vh, 52rem);
}

.pr-explore[data-layer='2'].is-l2-expanded {
  min-height: clamp(38rem, 96vh, 62rem);
}

.pr-explore[data-layer='2'].is-l2-expanded .pr-explore__stage-viewport {
  min-height: clamp(30rem, 88vh, 54rem);
  max-height: clamp(30rem, 88vh, 54rem);
}

.pr-explore[data-layer='2'] .pr-explore__node--poet {
  color: rgba(36, 40, 44, 0.7);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.pr-explore[data-layer='2'] .pr-explore__node--weak {
  color: rgba(24, 28, 32, 0.72);
  letter-spacing: 0.04em;
}

.pr-explore[data-layer='2'] .pr-explore__node--term {
  font-weight: 400;
  letter-spacing: 0.1em;
}

.pr-explore[data-layer='2'] .pr-explore__node--poet:hover,
.pr-explore[data-layer='2'] .pr-explore__node--poet:focus-visible {
  color: var(--color-text);
}

.pr-explore[data-layer='2'] .pr-explore__lines {
  overflow: hidden;
}

.pr-explore[data-layer='2'] .pr-explore__lines line {
  transition: stroke-opacity 0.2s ease, stroke-width 0.2s ease;
}

.pr-explore[data-layer='3'] .pr-explore__stage-wrap {
  max-width: 74rem;
}

.pr-explore__stage-viewport {
  position: relative;
  flex: 1 1 auto;
  width: 100%;
  min-height: clamp(15rem, 44vh, 30rem);
  max-height: clamp(15rem, 44vh, 30rem);
  transform-origin: 0 0;
  will-change: transform;
}

.pr-explore.is-animating .pr-explore__stage-viewport {
  transition: none;
}

.pr-explore.is-animating .pr-explore__node {
  transition: none;
}

.pr-explore__stage {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.pr-explore__lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
}

.pr-explore__nodes {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* —— 节点 —— */
.pr-explore__node {
  position: absolute;
  left: 0;
  top: 0;
  margin: 0;
  padding: 0.12em 0.08em;
  border: none;
  background: none;
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: 0.14em;
  color: rgba(28, 32, 36, 0.82);
  cursor: pointer;
  white-space: nowrap;
  will-change: transform, opacity;
  transition: color 0.2s ease;
  -webkit-font-smoothing: antialiased;
}

.pr-explore__node:hover,
.pr-explore__node:focus-visible {
  color: var(--color-text);
  outline: none;
}

.pr-explore__node--term {
  font-weight: 300;
}

.pr-explore__node--poet {
  font-family: var(--font-sans);
  letter-spacing: 0.06em;
  font-weight: 300;
}

.pr-explore__node--weak {
  letter-spacing: 0.04em;
}

.pr-explore__node--anchor {
  color: rgba(28, 32, 36, 0.68);
}

.pr-explore__node--center {
  color: rgba(10, 12, 14, 0.96);
  font-weight: 500;
}

.pr-explore[data-layer='2'] .pr-explore__node--center,
.pr-explore[data-layer='3'] .pr-explore__node--center,
.pr-explore[data-layer='4'] .pr-explore__node--center {
  color: rgba(8, 10, 12, 0.98);
  font-weight: 500;
}

/* —— 悬停提示 —— */
.pr-explore__tooltip {
  position: absolute;
  z-index: 8;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  padding: 0.7rem 0.95rem 0.75rem;
  font-size: var(--font-size-xs);
  letter-spacing: 0.06em;
  pointer-events: none;
  line-height: 1.55;
  white-space: nowrap;
}

.pr-explore__tooltip strong {
  display: block;
  font-size: var(--font-size-sm);
  letter-spacing: 0.12em;
  margin-bottom: 0.35rem;
}

.pr-explore__tooltip span {
  display: block;
}

/* —— 第四层诗卡片（叠在图下半部） —— */
.pr-explore__cards {
  position: absolute;
  z-index: 12;
  left: 50%;
  bottom: 0.5rem;
  transform: translateX(-50%);
  width: min(94%, 30rem);
  max-height: min(46%, 16rem);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: 0.15rem;
  pointer-events: auto;
  scrollbar-width: thin;
}

.pr-explore__cards:not([hidden]) {
  background: linear-gradient(
    to top,
    rgba(236, 236, 236, 0.94) 0%,
    rgba(236, 236, 236, 0.88) 72%,
    rgba(236, 236, 236, 0) 100%
  );
  backdrop-filter: blur(6px);
}

.pr-explore[data-layer='4'] .pr-explore__stage-viewport {
  cursor: default;
}

.pr-explore__card {
  opacity: 0;
  transform: translateY(8px);
  animation: pr-card-in 0.5s ease forwards;
  animation-delay: calc(var(--card-i, 0) * 0.06s + 0.12s);
}

@keyframes pr-card-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.pr-explore__card-head {
  display: block;
  width: 100%;
  border: none;
  background: none;
  text-align: left;
  padding: 0.65rem 0.85rem;
  cursor: pointer;
  transition: background 0.2s ease;
}

.pr-explore__card-head:hover {
  background: rgba(255, 255, 255, 0.35);
}

.pr-explore__card-title {
  margin: 0 0 0.2rem;
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--color-text);
}

.pr-explore__card-meta {
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
}

.pr-explore__card-body {
  padding: 0 0.85rem 0.75rem;
  font-family: var(--font-serif);
  font-size: var(--font-size-xs);
  line-height: var(--line-height-loose);
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

.pr-explore__card-body strong {
  color: var(--color-text);
  font-weight: 500;
}

.pr-explore__cards-more {
  align-self: center;
  margin-top: 0.15rem;
  border: none;
  background: none;
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0.35rem 0.6rem;
}

.pr-explore__cards-more:hover {
  color: var(--color-text);
}

.pr-explore.is-animating .pr-explore__node {
  pointer-events: none;
}

.pr-explore.is-animating .pr-explore__stage-viewport {
  pointer-events: none;
}

.pr-explore[data-layer='2'] .pr-explore__stage-viewport {
  cursor: default;
}

/* —— 响应式 —— */
@media (max-width: 720px) {
  .pr-explore {
    padding-inline: var(--space-sm);
    min-height: auto;
  }

  .pr-explore__stage-viewport {
    min-height: clamp(14rem, 40vh, 26rem);
    max-height: clamp(14rem, 40vh, 26rem);
  }

  .pr-explore[data-layer='2'] .pr-explore__stage-viewport {
    min-height: clamp(22rem, 68vh, 40rem);
    max-height: clamp(22rem, 68vh, 40rem);
  }

  .pr-explore[data-layer='2'].is-l2-expanded .pr-explore__stage-viewport {
    min-height: clamp(26rem, 78vh, 44rem);
    max-height: clamp(26rem, 78vh, 44rem);
  }

  .pr-explore__node {
    letter-spacing: 0.08em;
  }

  .pr-explore__cards {
    max-height: min(52%, 14rem);
    width: 98%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .pr-explore__rain,
  .pr-explore__node,
  .pr-explore__card {
    animation: none !important;
    transition: none !important;
  }

  .pr-explore__card {
    opacity: 1;
    transform: none;
  }
}