/* ============================================================
   page-about · 公司介绍
   全部页面专属选择器以 .page-about 前缀限定
   ============================================================ */

.page-about {
  --ab-gap: clamp(24px, 4vw, 48px);
  --ab-pad: clamp(20px, 3vw, 32px);
  padding-bottom: clamp(56px, 8vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px var(--gutter) 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.page-about .crumbs a {
  color: var(--cyan);
  text-decoration: none;
}
.page-about .crumbs a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-top: clamp(20px, 3vw, 36px);
}
.page-about .ab-hero__grid {
  gap: var(--ab-gap);
  align-items: start;
}
.page-about .ab-hero__copy h1 {
  margin: 12px 0 20px;
}
.page-about .ab-hero__copy .lede {
  margin: 0 0 18px;
  max-width: 58ch;
}
.page-about .ab-hero__copy > p:not(.lede) {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
  max-width: 60ch;
}
.page-about .ab-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about .ab-hero__media img,
.page-about .ab-process__media img,
.page-about .ab-readers__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 三条主线 ---------- */
.page-about .ab-lines__grid {
  gap: var(--ab-gap);
  align-items: start;
  margin-top: clamp(24px, 4vw, 40px);
}
.page-about .ab-axis__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 22px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .ab-axis__list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.page-about .ab-axis__list .num {
  font-size: 15px;
  color: var(--cyan);
}
.page-about .ab-lines__body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.page-about .ab-line {
  padding: var(--ab-pad);
  border-left-width: 2px;
  transition: transform 200ms var(--ease), border-color 200ms var(--ease),
    border-left-color 200ms var(--ease);
}
.page-about .ab-line:nth-child(1) { border-left-color: var(--cyan); }
.page-about .ab-line:nth-child(2) { border-left-color: var(--gold); }
.page-about .ab-line:nth-child(3) { border-left-color: var(--violet); }
.page-about .ab-line:hover {
  transform: translateY(-2px);
  border-color: var(--cyan-dim);
  border-left-color: var(--cyan);
}
.page-about .ab-line__idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-transform: uppercase;
}
.page-about .ab-line__title {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.3vw, 26px);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
}
.page-about .ab-line p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}
.page-about .ab-line__facts {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .ab-line__facts li {
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--rule);
  transition: color 140ms ease-out, border-color 140ms ease-out;
}
.page-about .ab-line__facts li:hover {
  color: var(--cyan);
  border-color: var(--cyan-dim);
}

/* ---------- 编辑与校对 ---------- */
.page-about .ab-process__media {
  margin: 0 0 clamp(28px, 4vw, 44px);
}
.page-about .ab-flow {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border: var(--hair);
  background: var(--panel);
  box-shadow: var(--shadow-panel);
}
.page-about .ab-flow li {
  padding: var(--ab-pad);
  border-bottom: var(--hair);
}
.page-about .ab-flow li:last-child {
  border-bottom: 0;
}
.page-about .ab-step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}
.page-about .ab-flow__title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}
.page-about .ab-flow p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

/* ---------- 编号刻度 ---------- */
.page-about .ab-scale {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px 4px;
  border-top: var(--hair);
}
.page-about .ab-scale li {
  position: relative;
  padding-top: 20px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  transition: color 140ms ease-out;
}
.page-about .ab-scale li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 10px;
  background: var(--cyan-dim);
  transform: translateX(-50%);
  transition: background 140ms ease-out, height 140ms ease-out;
}
.page-about .ab-scale li:hover {
  color: var(--cyan);
}
.page-about .ab-scale li:hover::before {
  height: 16px;
  background: var(--cyan);
}

.page-about .ab-numbering__grid {
  gap: 16px;
  margin-top: clamp(24px, 4vw, 36px);
}
.page-about .ab-note {
  padding: var(--ab-pad);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about .ab-note__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}
.page-about .ab-note:nth-child(2) .ab-note__num {
  color: var(--gold);
}
.page-about .ab-note:nth-child(3) .ab-note__num {
  color: var(--violet);
}
.page-about .ab-note__label {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 读者与服务地区 ---------- */
.page-about .ab-readers__grid {
  gap: var(--ab-gap);
  align-items: center;
}
.page-about .ab-readers__copy h2 {
  margin: 12px 0 18px;
}
.page-about .ab-readers__copy p {
  margin: 0 0 16px;
  max-width: 60ch;
  color: var(--muted);
  line-height: 1.85;
}
.page-about .ab-readers__figures {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(28px, 5vw, 56px);
  margin-top: 30px;
  padding-top: 26px;
  border-top: var(--hair);
}
.page-about .ab-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 4.5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--cyan);
}
.page-about .ab-figure__plus {
  font-size: 0.55em;
  vertical-align: super;
  color: var(--cyan-dim);
}
.page-about .ab-figure__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 站点信息 ---------- */
.page-about .ab-contact {
  border-top: var(--hair);
}
.page-about .ab-contact__rows {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  border-top: var(--hair);
}
.page-about .ab-contact__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: var(--hair);
  transition: padding-left 140ms ease-out;
}
.page-about .ab-contact__row:hover {
  padding-left: 8px;
}
.page-about .ab-contact__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.page-about .ab-contact__val {
  margin: 0;
  font-size: 16px;
  color: var(--text);
  word-break: break-word;
}
.page-about .ab-contact__note {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .ab-contact__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-dim);
}
.page-about .ab-contact__note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 窄屏折叠 ---------- */
@media (max-width: 899px) {
  .page-about .ab-hero__copy,
  .page-about .ab-hero__media,
  .page-about .ab-axis,
  .page-about .ab-lines__body,
  .page-about .ab-readers__media,
  .page-about .ab-readers__copy,
  .page-about .ab-numbering__grid > * {
    grid-column: 1 / -1;
  }
  .page-about .ab-readers__media {
    order: 2;
  }
  .page-about .ab-readers__copy {
    order: 1;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 640px) {
  .page-about .ab-scale {
    grid-template-columns: repeat(6, 1fr);
  }
}

@media (min-width: 720px) {
  .page-about .ab-contact__row {
    grid-template-columns: 180px 1fr;
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .ab-flow li {
    border-bottom: 0;
    border-right: var(--hair);
  }
  .page-about .ab-flow li:last-child {
    border-right: 0;
  }
}

@media (min-width: 960px) {
  .page-about .ab-axis {
    position: sticky;
    top: 100px;
  }
  .page-about .ab-axis__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    border-left: var(--hair);
  }
  .page-about .ab-axis__list li {
    position: relative;
    display: grid;
    grid-template-columns: 44px 1fr;
    align-items: center;
    gap: 10px;
    padding: 14px 0 14px 18px;
    border-bottom: var(--hair);
    white-space: normal;
    line-height: 1.5;
  }
  .page-about .ab-axis__list li::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 50%;
    width: 9px;
    height: 1px;
    background: var(--rule);
    transform: translateY(-50%);
    transition: background 140ms ease-out, width 140ms ease-out;
  }
  .page-about .ab-axis__list li:hover::before {
    width: 14px;
    background: var(--cyan);
  }
  .page-about .ab-axis__list .num {
    font-size: 20px;
  }
  .page-about .ab-scale {
    grid-template-columns: repeat(12, 1fr);
    gap: 0 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-line,
  .page-about .ab-contact__row,
  .page-about .ab-scale li::before,
  .page-about .ab-axis__list li::before,
  .page-about .ab-line__facts li {
    transition: none;
  }
  .page-about .ab-line:hover {
    transform: none;
  }
}