/* ============================================================
   page-community · 交流社区
   ============================================================ */

.page-community {
  display: block;
  overflow-x: clip;
}

/* ---------------- 首屏 ---------------- */

.page-community .hero-zone {
  padding-block: var(--space-6) var(--space-8);
}

.page-community .breadcrumb {
  margin-bottom: var(--space-6);
}

.page-community .hero-head {
  max-width: 44rem;
  margin-inline: auto;
  text-align: center;
}

.page-community .hero-title {
  margin: var(--space-2) 0 0;
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-community .hero-sep {
  display: block;
  position: relative;
  width: 140px;
  height: 9px;
  margin: var(--space-3) auto var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-community .hero-sep::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 44px;
  height: 1px;
  transform: translate(-50%, -50%);
  background: var(--color-primary);
}

.page-community .hero-head .lede {
  margin: 0;
  text-align: left;
  color: var(--color-ink-soft);
}

/* ---------------- 首屏数字带 ---------------- */

.page-community .data-band {
  margin-top: var(--space-8);
}

.page-community .data-band__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  text-align: center;
}

.page-community .data-band__cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-2);
}

.page-community .data-band__cell + .data-band__cell {
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-community .data-band__figure {
  font-variant-numeric: tabular-nums;
}

/* ---------------- 首屏分栏 ---------------- */

.page-community .hero-split {
  margin-top: var(--space-8);
  row-gap: var(--space-6);
}

.page-community .topic-index {
  align-self: start;
  padding: var(--space-3) var(--space-3) var(--space-4);
  background: var(--color-surface-deep);
}

.page-community .topic-index__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  color: var(--color-ink-muted);
  font-weight: var(--weight-body);
}

.page-community .topic-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-community .topic-index__item {
  position: relative;
}

.page-community .topic-index__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 24px;
  transform: translateY(-50%);
  background: var(--color-primary);
  transition: width 180ms ease-out;
}

.page-community .topic-index__item.is-current::before,
.page-community .topic-index__item:hover::before,
.page-community .topic-index__item:focus-within::before {
  width: 3px;
}

.page-community .topic-index__link {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-1) var(--space-2) var(--space-2);
  color: var(--color-ink);
  text-decoration: none;
  transition: background-color 180ms ease-out;
}

.page-community .topic-index__link:hover {
  background: color-mix(in srgb, var(--color-surface) 70%, transparent);
}

.page-community .topic-index__link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-community .topic-index__no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0;
}

.page-community .topic-index__name {
  font-size: var(--text-base);
  letter-spacing: var(--tracking-heading);
}

.page-community .topic-index__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-community .topic-index__note {
  margin: var(--space-3) 0 0;
  padding-left: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-community .hero-side__frame {
  margin: 0;
}

.page-community .hero-side__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-community .hero-side__note {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

/* ---------------- 条目流分组 ---------------- */

.page-community .flow-group {
  margin-top: var(--space-6);
}

.page-community .flow-group + .flow-group {
  margin-top: var(--space-8);
}

.page-community .flow-group__head {
  display: grid;
  gap: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thick) solid var(--color-contrast-surface);
}

.page-community .flow-group__title {
  margin: 0;
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  font-weight: var(--weight-heading);
}

.page-community .flow-group__title::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 2px;
  margin-right: var(--space-2);
  vertical-align: middle;
  background: var(--color-primary);
}

.page-community .flow-group__meta {
  margin: var(--space-1) 0 0;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.page-community .flow-group__thumb {
  margin: 0;
  width: 100%;
}

.page-community .flow-group__thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------------- 条目行 ---------------- */

.page-community .flow-item {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  grid-template-areas:
    "no cat"
    "no main"
    "no state";
  gap: var(--space-1) var(--space-2);
  padding: var(--space-4) var(--space-2) var(--space-4) var(--space-3);
  transition: background-color 180ms ease-out;
}

.page-community .flow-item + .flow-item {
  border-top: var(--border-thin) solid var(--color-line);
}

.page-community .flow-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-4);
  width: 0;
  height: 24px;
  background: var(--color-primary);
  transition: width 180ms ease-out;
}

.page-community .flow-item:hover,
.page-community .flow-item:focus-within {
  background: var(--color-surface-alt);
}

.page-community .flow-item:hover::before,
.page-community .flow-item:focus-within::before {
  width: 4px;
}

.page-community .flow-item__no {
  grid-area: no;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-lg);
  line-height: 1.2;
  color: var(--color-primary);
}

.page-community .flow-item__cat {
  grid-area: cat;
  justify-self: start;
  align-self: center;
  padding: 2px var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-accent);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, transparent);
}

.page-community .flow-item__main {
  grid-area: main;
  min-width: 0;
}

.page-community .flow-item__title {
  margin: 0;
  font-size: var(--text-xl);
  line-height: 1.45;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  font-weight: var(--weight-heading);
}

.page-community .flow-item__summary {
  margin: var(--space-1) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-community .flow-item__state {
  grid-area: state;
  justify-self: start;
  align-self: start;
  padding: 2px var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  white-space: nowrap;
}

.page-community .flow-item__state--new {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-community .flow-item__state--open {
  color: var(--color-ink-soft);
  border: var(--border-thin) solid var(--color-line);
}

.page-community .flow-item__state--archived {
  background: var(--color-surface-deep);
  color: var(--color-ink-muted);
}

/* ---------------- 条目展开 ---------------- */

.page-community .flow-item__more {
  margin-top: var(--space-2);
}

.page-community .flow-item__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  cursor: pointer;
  list-style: none;
}

.page-community .flow-item__toggle::-webkit-details-marker {
  display: none;
}

.page-community .flow-item__toggle::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1;
  color: var(--color-primary);
}

.page-community .flow-item__more[open] .flow-item__toggle::before {
  content: "−";
}

.page-community .flow-item__toggle:hover {
  color: var(--color-ink);
}

.page-community .flow-item__toggle:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-community .flow-item__dl {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-1) var(--space-2);
  margin: var(--space-2) 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
}

.page-community .flow-item__dl dt {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.page-community .flow-item__dl dd {
  margin: 0;
  min-width: 0;
  line-height: 1.8;
  color: var(--color-ink-soft);
}

/* ---------------- 引用与校对的口径 ---------------- */

.page-community .norms {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
}

.page-community .norms__item {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: var(--space-2);
  padding-block: var(--space-4);
}

.page-community .norms__item + .norms__item {
  border-top: var(--border-thin) solid var(--color-line);
}

.page-community .norms__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.page-community .norms__title {
  margin: 0;
  font-size: var(--text-lg);
  line-height: 1.45;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  font-weight: var(--weight-heading);
}

.page-community .norms__body p {
  margin: var(--space-1) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------------- 参与边界（深色区） ---------------- */

.page-community .boundary-zone {
  padding-block: var(--space-8);
}

.page-community .boundary-zone .section-kicker {
  color: var(--color-contrast-accent);
}

.page-community .boundary-zone .section-title {
  color: var(--color-contrast-ink);
}

.page-community .boundary-zone .section-note {
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.page-community .boundary-zone .rule-double {
  border-color: var(--color-contrast-line);
}

.page-community .boundary-grid {
  margin-top: var(--space-6);
  row-gap: var(--space-6);
}

.page-community .boundary-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-community .boundary-list__item {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-community .boundary-list__item + .boundary-list__item {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-community .boundary-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 12px;
  height: 2px;
  background: var(--color-contrast-accent);
}

.page-community .boundary-aside {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
}

.page-community .boundary-aside__label {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-contrast-accent);
}

.page-community .boundary-aside__text {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-contrast-ink);
}

.page-community .boundary-aside__copy {
  display: inline-block;
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: transparent;
  cursor: pointer;
  transition: background-color 180ms ease-out, color 180ms ease-out;
}

.page-community .boundary-aside__copy:hover,
.page-community .boundary-aside__copy:focus-visible {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

.page-community .boundary-aside__copy:focus-visible {
  outline: 2px solid var(--color-contrast-accent);
  outline-offset: 2px;
}

.page-community .boundary-aside__copy[data-copied] {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-color: var(--color-contrast-accent);
}

.page-community .boundary-aside__hint {
  margin: var(--space-1) 0 0;
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.page-community .boundary-aside__link {
  display: inline-block;
  margin-top: var(--space-3);
  color: var(--color-contrast-accent);
}

/* ---------------- 延伸入口 ---------------- */

.page-community .path-list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-community .path-list__item + .path-list__item {
  border-top: var(--border-thin) solid var(--color-line);
}

.page-community .path-list__link {
  position: relative;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) 24px;
  grid-template-areas:
    "no title arrow"
    "no desc  arrow";
  align-items: center;
  gap: var(--space-1) var(--space-2);
  padding: var(--space-3) var(--space-2) var(--space-3) var(--space-3);
  text-decoration: none;
  color: var(--color-ink);
  transition: background-color 180ms ease-out;
}

.page-community .path-list__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 24px;
  transform: translateY(-50%);
  background: var(--color-primary);
  transition: width 180ms ease-out;
}

.page-community .path-list__link:hover,
.page-community .path-list__link:focus-within {
  background: var(--color-surface-alt);
}

.page-community .path-list__link:hover::before,
.page-community .path-list__link:focus-within::before {
  width: 4px;
}

.page-community .path-list__link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-community .path-list__no {
  grid-area: no;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
}

.page-community .path-list__title {
  grid-area: title;
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
}

.page-community .path-list__desc {
  grid-area: desc;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-community .path-list__arrow {
  grid-area: arrow;
  justify-self: end;
  font-size: var(--text-lg);
  color: var(--color-accent);
  transition: transform 180ms ease-out;
}

.page-community .path-list__link:hover .path-list__arrow {
  transform: translateX(4px);
}

/* ---------------- 响应式 ---------------- */

@media (min-width: 640px) {
  .page-community .data-band__inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-community .data-band__cell + .data-band__cell {
    border-top: 0;
    border-left: var(--border-thin) solid var(--color-contrast-line);
  }
}

@media (min-width: 760px) {
  .page-community .flow-group__head--media {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-community .hero-zone {
    padding-block: var(--space-8) var(--space-8);
  }

  .page-community .topic-index {
    position: sticky;
    top: var(--space-4);
  }

  .page-community .flow-item {
    grid-template-columns: 52px 128px minmax(0, 1fr) 88px;
    grid-template-areas: "no cat main state";
    align-items: start;
    gap: var(--space-3);
    padding-inline: var(--space-3);
  }

  .page-community .flow-item__cat {
    align-self: start;
  }

  .page-community .flow-item__state {
    justify-self: end;
  }

  .page-community .norms__item {
    grid-template-columns: 56px minmax(0, 1fr);
  }

  .page-community .norms__item {
    padding-block: var(--space-4);
  }
}

@media (max-width: 480px) {
  .page-community .flow-item__dl {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-2);
  }

  .page-community .flow-item__dl dd + dt {
    padding-top: var(--space-1);
  }

  .page-community .path-list__link {
    grid-template-columns: 22px minmax(0, 1fr);
    grid-template-areas:
      "no title"
      "no desc";
    gap: var(--space-1);
  }

  .page-community .path-list__arrow {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-community .topic-index__item::before,
  .page-community .flow-item::before,
  .page-community .path-list__link::before,
  .page-community .path-list__arrow,
  .page-community .boundary-aside__copy {
    transition: none;
  }

  .page-community .path-list__link:hover .path-list__arrow {
    transform: none;
  }
}