/* ==========================================================================
   品牌介绍 · page-about
   ========================================================================== */

.page-about {
  --ch-accent: var(--cyan);
  --about-shadow: 6px;
}

/* --------------------------------------------------------------------------
   面包屑
   -------------------------------------------------------------------------- */
.page-about .crumbs {
  margin: 22px 0 0;
}

/* --------------------------------------------------------------------------
   首屏
   -------------------------------------------------------------------------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 62px) 0 clamp(38px, 6vw, 78px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: min(48%, 640px);
  background: linear-gradient(158deg, rgba(47, 240, 220, .18), rgba(47, 240, 220, 0) 68%);
  clip-path: polygon(0 0, 100% 0, 70% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(28px, 5vw, 46px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 10vw, 82px);
  line-height: 1.02;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(16px, 2.2vw, 18px);
  line-height: 1.78;
  color: var(--muted);
}

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

/* 首屏数据面板 */
.page-about .about-hero__stat {
  border: 2px solid var(--line-strong);
  background: var(--panel);
  padding: 20px 20px 8px;
  box-shadow: 8px 8px 0 rgba(47, 240, 220, .14);
}

.page-about .about-hero__stat-title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .hero-stat-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .hero-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .hero-stat:last-child {
  border-bottom: 0;
}

.page-about .hero-stat__k {
  font-size: 13px;
  color: var(--muted);
}

.page-about .hero-stat__v {
  font-family: var(--font-mono);
  font-size: clamp(15px, 3.4vw, 19px);
  letter-spacing: .03em;
  color: var(--paper);
  text-align: right;
}

/* --------------------------------------------------------------------------
   章节骨架：左侧编号 + 章节名，右侧正文
   -------------------------------------------------------------------------- */
.page-about .about-chapter {
  --ch-accent: var(--cyan);
  position: relative;
  border-top: 1px solid var(--line);
  padding: clamp(36px, 6vw, 84px) 0;
}

.page-about .about-chapter[data-accent="orange"] { --ch-accent: var(--orange); }
.page-about .about-chapter[data-accent="library"] { --ch-accent: var(--library); }
.page-about .about-chapter[data-accent="family"] { --ch-accent: var(--family); }
.page-about .about-chapter[data-accent="novice"] { --ch-accent: var(--novice); }

.page-about .about-chapter--last {
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter__inner {
  display: block;
}

.page-about .about-chapter__aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--ch-accent);
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  letter-spacing: .06em;
  color: var(--ch-accent);
}

.page-about .about-chapter__label {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 4.6vw, 27px);
  line-height: 1.22;
  color: var(--paper);
}

.page-about .about-chapter__body > * + * {
  margin-top: 22px;
}

.page-about .about-chapter__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-chapter__body strong {
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-chapter__body a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .about-chapter__body a:hover,
.page-about .about-chapter__body a:focus-visible {
  color: var(--paper);
  background: rgba(47, 240, 220, .16);
}

/* 要点列表 */
.page-about .about-points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 24px;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 11px;
  height: 2px;
  background: var(--ch-accent);
}

/* --------------------------------------------------------------------------
   四条业务线
   -------------------------------------------------------------------------- */
.page-about .lines-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-line {
  --tone: var(--cyan);
  position: relative;
  background: var(--panel);
  border: 2px solid var(--line-strong);
  border-top: 4px solid var(--tone);
  padding: 20px 18px 20px;
  transition: transform 240ms var(--ease), box-shadow 240ms var(--ease), border-color 240ms var(--ease);
}

.page-about .about-line[data-tone="novice"] { --tone: var(--novice); }
.page-about .about-line[data-tone="library"] { --tone: var(--library); }
.page-about .about-line[data-tone="export"] { --tone: var(--export); }
.page-about .about-line[data-tone="family"] { --tone: var(--family); }

.page-about .about-line__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .about-line__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: .08em;
  color: var(--tone);
  border: 2px solid var(--tone);
  padding: 1px 6px;
}

.page-about .about-line__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.25;
  color: var(--paper);
}

.page-about .about-line__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-line__io {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 9px;
}

.page-about .about-line__io > div {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}

.page-about .about-line__io dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--tone);
}

.page-about .about-line__io dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.62;
  color: var(--paper);
}

/* --------------------------------------------------------------------------
   配图
   -------------------------------------------------------------------------- */
.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 2px solid var(--line-strong);
  object-fit: cover;
  background: var(--panel);
}

.page-about .about-figure__cap {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-figure__k {
  display: block;
  color: var(--family);
  margin-bottom: 4px;
}

/* 家庭横幅带 */
.page-about .about-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(21, 28, 66, .9), rgba(11, 16, 36, .4));
  padding: clamp(28px, 5vw, 52px) 0;
}

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

.page-about .about-band .about-figure__cap {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--paper);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* --------------------------------------------------------------------------
   团队分工
   -------------------------------------------------------------------------- */
.page-about .about-roles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-role__num {
  grid-row: 1 / 3;
  align-self: start;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 34px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--ch-accent);
}

.page-about .about-role__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   时间轴
   -------------------------------------------------------------------------- */
.page-about .about-timeline {
  margin-top: 8px;
}

.page-about .about-timeline__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-timeline .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .filter-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .about-timeline__track {
  list-style: none;
  margin: 0;
  padding: 4px 4px 20px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 252px;
  gap: 16px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  scrollbar-color: var(--cyan) transparent;
  scrollbar-width: thin;
}

.page-about .about-timeline__node {
  scroll-snap-align: start;
  position: relative;
  background: var(--panel);
  border: 2px solid var(--line-strong);
  padding: 22px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .about-timeline__node::after {
  content: "";
  position: absolute;
  left: -2px;
  right: -2px;
  top: -2px;
  height: 4px;
  background: var(--ch-accent);
}

.page-about .about-timeline__node[hidden],
.page-about .about-timeline__node.is-hidden {
  display: none;
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--ch-accent);
}

.page-about .about-timeline__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.28;
  color: var(--paper);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--muted);
}

@media (hover: hover) {
  .page-about .about-line:hover {
    transform: translate(-3px, -3px);
    box-shadow: 5px 5px 0 var(--tone);
    border-color: var(--tone);
  }

  .page-about .about-timeline__node:hover {
    transform: translateY(-5px);
    border-color: var(--ch-accent);
    box-shadow: 0 6px 0 rgba(47, 240, 220, .34);
  }

  .page-about .about-timeline__node:hover .about-timeline__text {
    color: var(--paper);
  }
}

/* --------------------------------------------------------------------------
   覆盖与质控
   -------------------------------------------------------------------------- */
.page-about .about-kpis {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 26px;
}

.page-about .about-kpi {
  border-left: 4px solid var(--ch-accent);
  background: var(--panel);
  padding: 16px 18px;
}

.page-about .about-check {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-check__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-check__step {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 2px solid var(--ch-accent);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ch-accent);
}

.page-about .about-check__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-check__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   收束
   -------------------------------------------------------------------------- */
.page-about .about-reasons {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-reason {
  position: relative;
  border: 2px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(21, 28, 66, .9), rgba(11, 16, 36, .5));
  padding: 20px 18px;
}

.page-about .about-reason::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--ch-accent);
}

.page-about .about-reason__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-reason__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* --------------------------------------------------------------------------
   进场动效
   -------------------------------------------------------------------------- */
.page-about [data-reveal] {
  opacity: 1;
}

@media (min-width: 900px) {
  .js .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 340ms var(--ease), transform 340ms var(--ease);
  }

  .js .page-about [data-reveal].is-in {
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   断点：≥560px
   -------------------------------------------------------------------------- */
@media (min-width: 560px) {
  .page-about .lines-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-kpis {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-reasons {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* --------------------------------------------------------------------------
   断点：≥900px —— 章节转为左右两级
   -------------------------------------------------------------------------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(272px, .86fr);
    gap: clamp(44px, 6vw, 92px);
  }

  .page-about .about-chapter__inner {
    display: grid;
    grid-template-columns: minmax(156px, 224px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 80px);
    align-items: start;
  }

  .page-about .about-chapter__aside {
    display: block;
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    border-bottom: 0;
    border-top: 5px solid var(--ch-accent);
    padding: 16px 0 0;
    margin: 0;
  }

  .page-about .about-chapter__num {
    display: block;
    font-size: 42px;
    margin-bottom: 14px;
  }

  .page-about .about-chapter__label {
    font-size: 21px;
  }

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

  .page-about .about-timeline__track {
    grid-auto-columns: minmax(240px, 1fr);
    padding-bottom: 26px;
  }

  .page-about .about-band {
    padding: clamp(40px, 5vw, 64px) 0;
  }
}

/* --------------------------------------------------------------------------
   断点：≥1280px
   -------------------------------------------------------------------------- */
@media (min-width: 1280px) {
  .page-about .about-chapter__inner {
    grid-template-columns: 248px minmax(0, 1fr);
  }

  .page-about .about-role {
    grid-template-columns: 88px minmax(0, 1fr);
    padding: 22px 0;
  }
}

/* --------------------------------------------------------------------------
   降低动态效果
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal].is-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .about-line,
  .page-about .about-timeline__node {
    transition: none;
  }

  .page-about .about-line:hover,
  .page-about .about-timeline__node:hover {
    transform: none;
  }
}