/* =========================================================
   page-about — 里弄自述
   作用域：.page-about
   ========================================================= */

.page-about {
  --about-hair: rgba(143, 160, 200, 0.24);
  --about-hair-strong: rgba(143, 160, 200, 0.46);
  position: relative;
  color: var(--fg);
}

.page-about > section {
  position: relative;
  padding: clamp(44px, 7.5vw, 92px) 0;
}

/* ---------- 01 首屏：对角色块 ---------- */

.page-about .about-hero {
  overflow: hidden;
  padding-top: clamp(20px, 3.6vw, 38px);
  padding-bottom: clamp(58px, 9vw, 108px);
  background:
    linear-gradient(167deg,
      var(--ink-deep) 0%,
      var(--ink-deep) 53%,
      var(--ink-navy) 53.35%,
      var(--ink-navy) 100%);
}

.page-about .about-hero__blade {
  position: absolute;
  z-index: 0;
  top: clamp(-34px, -3vw, -14px);
  right: -14%;
  width: min(520px, 68vw);
  height: clamp(150px, 24vw, 285px);
  background: linear-gradient(140deg, rgba(198, 75, 224, 0.30), rgba(240, 116, 58, 0.10));
  transform: skewY(-6deg);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: clamp(22px, 4vw, 42px);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--fg-soft);
}

.page-about .about-hero .crumb a {
  color: var(--fg-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-hero .crumb a:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.page-about .about-hero__stack {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__index {
  margin: 0;
  color: var(--brick);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 5.5vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 42ch;
  font-size: var(--step-1);
  line-height: 1.78;
  color: var(--fg-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

.page-about .about-hero__board {
  padding: 22px clamp(18px, 2.6vw, 26px);
  background: rgba(22, 32, 74, 0.88);
  border-color: var(--about-hair-strong);
}

.page-about .about-hero__board .t-index {
  margin: 0;
  color: var(--cyan);
}

.page-about .about-status {
  display: grid;
  gap: 11px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.92rem;
  line-height: 1.5;
}

.page-about .about-status li {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
  color: var(--fg);
}

/* ---------- 章节索引区 ---------- */

.page-about .section-head {
  max-width: 60ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .section-head__index {
  margin: 0;
  color: var(--brick);
}

.page-about .section-head__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.35rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about .section-head__note {
  margin: 12px 0 0;
  max-width: 48ch;
  color: var(--fg-soft);
  font-size: 0.96rem;
  line-height: 1.75;
}

/* ---------- 02 起点 ---------- */

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-origin__text p {
  margin: 0 0 1.15em;
  line-height: 1.85;
}

.page-about .about-origin__text p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin__fig {
  margin: 0;
}

/* ---------- 03 目录重整 ---------- */

.page-about .about-catalog__compare {
  display: grid;
  gap: 16px;
}

.page-about .about-catalog__side {
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-catalog__side--old {
  background: rgba(22, 32, 74, 0.58);
  border-color: var(--about-hair);
  color: var(--fg-soft);
}

.page-about .about-catalog__side--new {
  background:
    linear-gradient(150deg, rgba(240, 116, 58, 0.17), rgba(11, 16, 38, 0.94) 58%);
  border-color: rgba(240, 116, 58, 0.52);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.42);
}

.page-about .about-catalog__side .t-index {
  margin: 0;
  color: var(--fg-soft);
}

.page-about .about-catalog__side--new .t-index {
  color: var(--brick);
}

.page-about .about-catalog__side-title {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-2);
  line-height: 1.3;
}

.page-about .about-catalog__side--old .about-catalog__side-title {
  color: var(--fg-soft);
}

.page-about .about-catalog__old {
  display: grid;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  font-size: 0.94rem;
}

.page-about .about-catalog__old li {
  padding: 9px 13px;
  border: 1px dashed var(--about-hair);
  border-radius: var(--radius);
}

.page-about .about-doors {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(144px, 1fr));
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-doors li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 11px;
  background: rgba(11, 16, 38, 0.74);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--brick);
  border-radius: var(--radius);
  font-size: 0.86rem;
  line-height: 1.4;
  color: var(--fg);
  transition: transform 200ms var(--ease), border-left-color 200ms var(--ease);
}

.page-about .about-doors li:hover {
  transform: translateY(-3px);
  border-left-color: var(--neon-pink);
}

.page-about .about-doors b {
  flex: none;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--brick);
}

.page-about .about-catalog__gain {
  margin-top: clamp(22px, 3.4vw, 36px);
  padding: 20px clamp(18px, 3vw, 28px);
  border-left: 3px solid var(--neon-purple);
  background: rgba(198, 75, 224, 0.09);
  border-radius: var(--radius);
}

.page-about .about-catalog__gain-line {
  margin: 0;
  max-width: 64ch;
  line-height: 1.85;
}

.page-about .about-catalog__gain-links {
  margin: 14px 0 0;
}

/* ---------- 04 空间与场景 ---------- */

.page-about .about-rooms__layout {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-rooms__list {
  display: grid;
  gap: 14px;
}

.page-about .about-room {
  padding: 22px clamp(18px, 2.6vw, 28px);
  background: var(--ink-navy);
  border: 1px solid var(--about-hair);
  border-left: 4px solid var(--brick);
  border-radius: var(--radius);
  transition: transform 220ms var(--ease), border-left-color 220ms var(--ease);
}

.page-about .about-room:nth-child(2) {
  border-left-color: var(--neon-purple);
}

.page-about .about-room:nth-child(3) {
  border-left-color: var(--cyan);
}

.page-about .about-room:hover {
  transform: translateY(-3px);
  border-left-color: var(--neon-pink);
}

.page-about .about-room__title {
  margin: 14px 0 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-1);
  line-height: 1.42;
  color: var(--fg);
}

.page-about .about-room p {
  margin: 0;
  color: var(--fg-soft);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .about-rooms__fig {
  margin: 0;
}

/* ---------- 05 团队与日常 ---------- */

.page-about .about-crew__grid {
  display: grid;
  gap: clamp(30px, 4.4vw, 52px);
  align-items: center;
}

.page-about .about-crew__fig {
  margin: 0;
}

.page-about .about-crew__text .section-head {
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-crew__intro {
  margin: 0;
}

.page-about .about-crew__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__stats li {
  display: grid;
  gap: 5px;
  padding: 14px 12px;
  background: rgba(22, 32, 74, 0.82);
  border: 1px solid var(--about-hair);
  border-top: 2px solid var(--brick);
  border-radius: var(--radius);
}

.page-about .about-crew__stats li:nth-child(3) {
  border-top-color: var(--neon-purple);
}

.page-about .about-crew__stats li:nth-child(4) {
  border-top-color: var(--cyan);
}

.page-about .about-crew__num {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.2vw, 2.05rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sign-cream);
}

.page-about .about-crew__label {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--fg-soft);
}

.page-about .about-crew__note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--amber);
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--fg-soft);
}

/* ---------- 06 比一比 ---------- */

.page-about .compare-rows {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .compare-row {
  display: grid;
  gap: 9px;
  padding: 18px clamp(16px, 2.6vw, 26px);
  background: rgba(22, 32, 74, 0.58);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
  transition: background 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .compare-row:hover {
  background: rgba(22, 32, 74, 0.96);
  border-color: rgba(240, 116, 58, 0.5);
}

.page-about .compare-row__dim {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--brick);
}

.page-about .compare-row__good,
.page-about .compare-row__bad {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
}

.page-about .compare-row__good {
  color: var(--fg);
}

.page-about .compare-row__bad {
  padding-left: 12px;
  border-left: 2px solid rgba(143, 160, 200, 0.38);
  color: var(--fg-soft);
}

.page-about .compare-row__mark {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 6px;
  border: 1px solid rgba(143, 160, 200, 0.42);
  border-radius: var(--radius);
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--index-blue);
  vertical-align: 1px;
}

/* ---------- 07 节点 ---------- */

.page-about .track-list {
  position: relative;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .track-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brick), var(--neon-purple) 55%, var(--cyan));
}

.page-about .track-item {
  position: relative;
  padding: 18px clamp(16px, 2.6vw, 26px);
  background: rgba(22, 32, 74, 0.62);
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--brick);
  border-radius: var(--radius);
  transition: background 220ms var(--ease), border-left-color 220ms var(--ease);
}

.page-about .track-item:hover {
  background: rgba(22, 32, 74, 0.92);
  border-left-color: var(--neon-pink);
}

.page-about .track-item::before {
  content: "";
  position: absolute;
  top: 26px;
  left: -21px;
  width: 10px;
  height: 10px;
  background: var(--brick);
  border: 2px solid var(--ink-deep);
  border-radius: 50%;
  transform: translateX(-50%);
}

.page-about .track-item__door {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 22px;
  padding: 0 8px;
  margin-bottom: 10px;
  background: var(--brick);
  color: var(--ink-deep);
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  border-radius: var(--radius);
}

.page-about .track-item__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-1);
  line-height: 1.42;
  color: var(--fg);
}

.page-about .track-item__body {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--fg-soft);
}

/* ---------- 08 收尾 ---------- */

.page-about .about-outro__panel {
  padding: clamp(26px, 4.2vw, 54px);
  color: var(--ink-deep);
}

.page-about .about-outro__index {
  margin: 0;
  color: var(--deep-brick);
}

.page-about .about-outro__title {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.55rem, 3.6vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--ink-deep);
}

.page-about .about-outro__panel p {
  max-width: 58ch;
  margin: 0 0 0.9em;
  line-height: 1.82;
  color: rgba(11, 16, 38, 0.82);
}

.page-about .about-outro__panel .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}

.page-about .about-outro__panel .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin: 20px 0 0;
}

.page-about .about-outro__links .link-more {
  font-size: 0.9rem;
  color: var(--deep-brick);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.page-about .about-outro__links .link-more:hover {
  color: var(--brick);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-crew__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__stack {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(32px, 4vw, 62px);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(32px, 4.4vw, 68px);
  }

  .page-about .about-catalog__compare {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 22px;
  }

  .page-about .about-room:nth-child(2) {
    margin-left: clamp(0px, 2vw, 24px);
  }

  .page-about .about-room:nth-child(3) {
    margin-left: clamp(0px, 4vw, 48px);
  }

  .page-about .compare-row {
    grid-template-columns: 148px minmax(0, 3fr) minmax(0, 2fr);
    align-items: start;
    gap: clamp(18px, 2.6vw, 32px);
  }

  .page-about .compare-row__dim {
    padding-top: 3px;
  }

  .page-about .track-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 22px;
    padding-left: 0;
  }

  .page-about .track-list::before {
    display: none;
  }

  .page-about .track-item::before {
    display: none;
  }
}

@media (min-width: 940px) {
  .page-about .about-rooms__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-crew__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (max-width: 480px) {
  .page-about .about-doors {
    grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
  }

  .page-about .about-hero__blade {
    right: -22%;
    opacity: 0.8;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}