/* ============ 品牌历程页 · page-about ============ */

.page-about .about-hero {
  padding-block: clamp(26px, 5vw, 56px) clamp(34px, 6vw, 74px);
  border-bottom: 2px solid var(--line);
  background: var(--ink-indigo);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .about-hero__meta {
  margin: 0 0 14px;
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  color: var(--teal);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 7.5vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0 0 14px;
  max-width: 36em;
  font-size: clamp(1rem, 2.2vw, 1.1rem);
  line-height: 1.85;
  color: rgba(244, 237, 224, 0.88);
}

.page-about .about-hero__note {
  margin: 0 0 26px;
  max-width: 36em;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--muted);
}

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

.page-about .about-hero__visual {
  width: 100%;
  max-width: 400px;
  margin-inline: auto;
  padding: clamp(14px, 3vw, 24px);
  border: 2px solid var(--line-teal);
  background: var(--indigo-2);
  box-shadow: var(--shadow-hard-lg);
}

.page-about .about-hero__svg {
  display: block;
  width: 100%;
  height: auto;
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-hero__visual {
    margin-inline: 0 0;
    justify-self: end;
  }
}

/* ---------- 01 入口主张的由来 ---------- */

.page-about .about-origin__inner {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-origin__aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-origin__num {
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-origin__vert {
  font-size: 12px;
  letter-spacing: 0.26em;
  color: var(--teal-deep);
}

.page-about .about-origin__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-origin__body p {
  margin: 0 0 1.15em;
  max-width: 36em;
  line-height: 1.85;
  color: rgba(244, 237, 224, 0.82);
}

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

@media (min-width: 900px) {
  .page-about .about-origin__inner {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: clamp(28px, 5vw, 60px);
  }

  .page-about .about-origin__aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }

  .page-about .about-origin__vert {
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
  }
}

/* ---------- 02 版本年表 ---------- */

.page-about .about-timeline__figure {
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: var(--line-soft);
}

.page-about .tl-node {
  position: relative;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 18px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  border: 3px solid var(--teal);
  background: var(--ink-indigo);
}

.page-about .tl-node--final::before {
  background: var(--teal);
}

.page-about .tl-card {
  border: 2px solid var(--line);
  background: var(--night-card);
  box-shadow: var(--shadow-hard);
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .tl-card[open] {
  border-color: var(--line-teal);
}

.page-about .tl-card__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "ver tier mark"
    "title title title";
  align-items: center;
  gap: 10px 12px;
  padding: clamp(14px, 2.6vw, 20px);
  cursor: pointer;
  list-style: none;
}

.page-about .tl-card__summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-card__summary:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: -3px;
}

.page-about .tl-ver {
  grid-area: ver;
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--gold);
  border: 2px solid var(--gold);
  background: rgba(242, 178, 62, 0.12);
}

.page-about .tl-tier {
  grid-area: tier;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .tl-card__mark {
  grid-area: mark;
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--teal);
}

.page-about .tl-card__mark::before {
  content: "+";
}

.page-about .tl-card[open] .tl-card__mark::before {
  content: "−";
}

.page-about .tl-card__title {
  grid-area: title;
  font-size: clamp(1.05rem, 3vw, 1.35rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .tl-card__body {
  padding: clamp(14px, 2.4vw, 18px) clamp(14px, 2.6vw, 20px) clamp(16px, 2.8vw, 22px);
  border-top: 2px solid var(--line-soft);
}

.page-about .tl-card__body p {
  margin: 0 0 12px;
  max-width: 36em;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(244, 237, 224, 0.82);
}

.page-about .tl-points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .tl-points li {
  position: relative;
  padding-left: 20px;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .tl-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--teal-deep);
}

@media (min-width: 900px) {
  .page-about .timeline {
    padding-left: 34px;
  }

  .page-about .timeline::before {
    left: 8px;
  }

  .page-about .tl-node::before {
    left: -34px;
  }

  .page-about .tl-card__summary {
    grid-template-areas: "ver tier mark";
    grid-template-columns: auto 1fr auto;
    padding: clamp(18px, 2.4vw, 24px) clamp(20px, 2.6vw, 28px);
  }

  .page-about .tl-card__title {
    grid-column: 1 / -1;
    grid-row: 2;
    margin-top: 6px;
    font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  }
}

/* ---------- 03 回访路径压缩记录 ---------- */

.page-about .path-compare {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .path-panel {
  padding: clamp(16px, 3vw, 24px);
  border: 2px solid var(--ink);
  background: #fffbf3;
  box-shadow: 6px 6px 0 rgba(20, 22, 31, 0.24);
  color: var(--ink);
}

.page-about .path-panel--new {
  border-color: var(--teal-deep);
  box-shadow: 6px 6px 0 rgba(23, 169, 143, 0.4);
}

.page-about .path-panel__label {
  margin: 0 0 14px;
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  color: var(--ink);
}

.page-about .path-panel--new .path-panel__label {
  color: var(--teal-deep);
}

.page-about .path-chain {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .path-step {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 2px solid var(--ink);
  background: var(--paper-2);
  font-size: 0.9rem;
}

.page-about .path-step--live {
  border-color: var(--teal-deep);
  background: rgba(47, 224, 192, 0.18);
}

.page-about .path-step__n {
  font-size: 0.82rem;
  color: var(--ink);
  opacity: 0.6;
}

.page-about .path-panel__note {
  margin: 14px 0 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: rgba(20, 22, 31, 0.72);
}

.page-about .path-explain {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .path-explain p {
  margin: 0;
  max-width: 38em;
  font-size: 0.98rem;
  line-height: 1.9;
  color: rgba(20, 22, 31, 0.85);
}

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

@media (min-width: 820px) {
  .page-about .path-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 04 规范与团队 ---------- */

.page-about .about-spec__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

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

.page-about .spec-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .spec-list__item {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 2px solid var(--line-soft);
}

.page-about .spec-list__item:first-child {
  border-top: 2px solid var(--line-soft);
}

.page-about .spec-list__key {
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .spec-list__val {
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(244, 237, 224, 0.84);
}

.page-about .spec-note {
  margin: 18px 0 0;
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--muted);
}

@media (min-width: 900px) {
  .page-about .about-spec__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

/* ---------- 05 更新节奏与服务边界 ---------- */

.page-about .rhythm-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(14px, 2.6vw, 22px);
}

.page-about .rhythm-item {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 3vw, 24px);
  border: 2px solid var(--line);
  border-left: 8px solid var(--teal-deep);
  background: var(--night-card);
  box-shadow: var(--shadow-hard);
}

.page-about .rhythm-item__key {
  margin: 0;
  font-size: clamp(1.05rem, 2.8vw, 1.25rem);
  font-weight: 700;
  color: var(--paper);
}

.page-about .rhythm-item__value {
  margin: 0;
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .rhythm-item__note {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-rhythm__boundary {
  margin: clamp(24px, 4vw, 36px) 0 0;
  max-width: 38em;
  padding-left: 16px;
  border-left: 4px solid var(--gold);
  font-size: 0.92rem;
  line-height: 1.85;
  color: rgba(244, 237, 224, 0.78);
}

@media (min-width: 820px) {
  .page-about .rhythm-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 收束带 ---------- */

.page-about .about-close {
  padding-block: clamp(34px, 6vw, 64px);
  border-top: 2px solid var(--line-teal);
  background: var(--indigo-2);
}

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

.page-about .about-close__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-close__text {
  margin: 0;
  max-width: 36em;
  font-size: 0.96rem;
  line-height: 1.85;
  color: rgba(244, 237, 224, 0.8);
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

@media (min-width: 900px) {
  .page-about .about-close__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "title actions"
      "text actions";
    align-items: center;
    gap: 10px 40px;
  }

  .page-about .about-close__title {
    grid-area: title;
  }

  .page-about .about-close__text {
    grid-area: text;
    margin-top: 0;
  }

  .page-about .about-close__actions {
    grid-area: actions;
    margin-top: 0;
    flex-direction: column;
    align-items: stretch;
  }
}