/* ===== 品牌总览 page-about ===== */
.page-about {
  --about-rail: 224px;
  --about-line: rgba(242, 193, 78, 0.55);
  overflow-x: clip;
}

/* --- 首屏 --- */
.page-about .about-hero {
  padding: clamp(28px, 5vw, 56px) 0 clamp(24px, 4vw, 40px);
  border-bottom: 2px solid var(--orbit);
  background:
    radial-gradient(115% 90% at 88% -12%, rgba(57, 224, 208, 0.11), transparent 62%),
    radial-gradient(90% 80% at 4% 0%, rgba(242, 193, 78, 0.09), transparent 58%);
}

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

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 6.4vw, 58px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--warm);
  margin: 14px 0 20px;
  max-width: 18ch;
}

.page-about .about-hero__text {
  font-size: 16px;
  line-height: 1.9;
  color: var(--warm-soft);
  margin: 0;
  max-width: 60ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--orbit);
  border: var(--border);
  box-shadow: var(--shadow);
}

.page-about .about-stat {
  background: var(--panel);
  padding: 16px 18px;
}

.page-about .about-stat dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-stat dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--gold);
  letter-spacing: 0.02em;
}

/* --- 分屏骨架 --- */
.page-about .about-body {
  display: grid;
  gap: 32px;
  padding: clamp(36px, 5vw, 64px) 0 clamp(48px, 7vw, 96px);
}

/* --- 左侧章节刻度 --- */
.page-about .about-rail {
  border-left: 2px solid var(--orbit);
  padding-left: 16px;
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--warm);
  border-bottom-color: var(--gold);
}

.page-about .about-rail__num {
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 0.1em;
}

/* --- 右侧章节正文 --- */
.page-about .about-sections {
  display: grid;
  gap: clamp(56px, 8vw, 96px);
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: 118px;
  min-width: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--orbit);
  position: relative;
}

.page-about .about-section__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 72px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-section__index {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-section__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .about-section__lede {
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 68ch;
}

.page-about .about-prose p {
  margin: 0 0 1.5em;
  font-size: 16px;
  line-height: 1.95;
  color: var(--warm-soft);
  max-width: 66ch;
}

.page-about .about-prose p:first-child {
  color: var(--warm);
  font-size: 17px;
}

/* --- 四类内容线卡片 --- */
.page-about .about-linecards {
  display: grid;
  gap: 20px;
}

.page-about .about-linecard {
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.page-about .about-linecard__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-linecard__top h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--warm);
  letter-spacing: -0.005em;
}

.page-about .about-linecard__summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--warm-soft);
}

.page-about .about-linecard__facts {
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--orbit);
}

.page-about .about-linecard__facts dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin-bottom: 4px;
}

.page-about .about-linecard__facts dd {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-linecard__facts dd:last-child {
  margin-bottom: 0;
}

.page-about .about-linecard__more {
  margin-top: auto;
  align-self: flex-start;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-linecard__more:hover,
.page-about .about-linecard__more:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* --- 图片 --- */
.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: var(--border);
  box-shadow: var(--shadow);
  background: var(--panel);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* --- 团队与分工 --- */
.page-about .about-team {
  display: grid;
  gap: 28px;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--orbit);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--orbit);
  transition: background var(--dur) var(--ease);
}

.page-about .about-role:hover {
  background: rgba(28, 42, 85, 0.42);
}

.page-about .about-role__num {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .about-role__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  color: var(--warm);
}

.page-about .about-role__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--warm-soft);
}

.page-about .about-team .about-figure {
  margin: 0;
}

.page-about .about-team__note {
  margin: 24px 0 0;
  padding: 18px 20px;
  border-left: 4px solid var(--cyan);
  background: var(--panel);
  font-size: 15px;
  line-height: 1.9;
  color: var(--warm-soft);
  max-width: 70ch;
}

/* --- 发展节点时间轴 --- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 0 30px;
  position: relative;
  border-left: 2px dashed var(--orbit);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 0;
  height: 88px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(242, 193, 78, 0));
}

.page-about .about-node {
  position: relative;
  padding-bottom: 32px;
}

.page-about .about-node:last-child {
  padding-bottom: 8px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 6px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--gold);
  border-radius: 50%;
  background: var(--void);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-node:hover::before {
  background: var(--gold);
  box-shadow: 0 0 0 6px rgba(242, 193, 78, 0.14);
}

.page-about .about-node__phase {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-node h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--warm);
}

.page-about .about-node p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--warm-soft);
  max-width: 64ch;
}

/* --- 长期做法 --- */
.page-about .about-practices {
  display: grid;
  gap: 16px;
}

.page-about .about-practice {
  padding: 20px;
  background: var(--panel);
  border: 2px solid var(--orbit);
  border-left: 4px solid var(--clay);
  transition: border-left-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-practice:hover {
  border-left-color: var(--gold);
  transform: translate(-2px, -2px);
}

.page-about .about-practice h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--warm);
}

.page-about .about-practice p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--warm-soft);
}

/* --- 收束区 --- */
.page-about .about-close {
  padding: clamp(44px, 6vw, 72px) 0;
  background: var(--panel);
}

.page-about .about-close__in {
  display: grid;
  gap: 18px;
}

.page-about .about-close h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 4.2vw, 40px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--warm);
  max-width: 20ch;
}

.page-about .about-close p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--warm-soft);
  max-width: 62ch;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 6px;
}

/* --- 断点 --- */
@media (min-width: 640px) {
  .page-about .about-linecards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-practices {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-close__in {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
    padding-left: 20px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 14px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 32px;
  }

  .page-about .about-team__note {
    margin-top: 30px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__in {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-figure--wide {
    margin-top: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-linecard__more,
  .page-about .about-role,
  .page-about .about-node::before,
  .page-about .about-practice {
    transition: none;
  }

  .page-about .about-practice:hover {
    transform: none;
  }
}