/* ===================================================================
   EMC全站 · 品牌档案  /profile/   —— 纵向档案条目流
   作用域：.page-about
   =================================================================== */

.page-about {
  --about-rail-w: 168px;
  --about-gap: clamp(20px, 3vw, 46px);
  --about-line: rgba(30, 58, 82, .62);
  --about-body: #C3D3DE;
  --about-soft: #9FB3C4;
  padding-top: clamp(14px, 2.2vw, 26px);
  padding-bottom: clamp(52px, 7vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  margin-bottom: clamp(14px, 2vw, 22px);
}
.page-about .bc-link {
  color: var(--muted);
}
.page-about .bc-link:hover {
  color: var(--cyan);
}
.page-about .bc-list [aria-current="page"] {
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
}

/* ---------- 首屏：档案页眉 ---------- */
.page-about .about-hero {
  position: relative;
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--cyan);
  background-color: var(--ink-2);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 42px 42px;
  padding: clamp(18px, 3vw, 42px);
  box-shadow: var(--shadow-hard);
}

/* 顶部刻度带 */
.page-about .about-ruler {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 0;
  margin-bottom: clamp(20px, 3vw, 34px);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--cyan);
  overflow: hidden;
}
.page-about .ruler-tick {
  position: relative;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: .02em;
  color: var(--muted);
  padding-bottom: 4px;
  white-space: nowrap;
}
.page-about .ruler-tick::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -5px;
  width: 1px;
  height: 4px;
  background: var(--line);
  transform: translateX(-50%);
}
.page-about .ruler-tick--now {
  color: var(--amber);
}
.page-about .ruler-tick--now::after {
  background: var(--amber);
  height: 6px;
}

.page-about .hero-kicker {
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
  margin: 0;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(26px, 5.6vw, 50px);
  line-height: 1.14;
  letter-spacing: .04em;
  font-weight: 700;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--about-body);
}

/* 首屏数据条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3.2vw, 36px) 0 0;
  padding: 0;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}
.page-about .about-stats > div {
  background: var(--ink);
  padding: 13px 12px 15px;
}
.page-about .about-stats .stat-key {
  margin: 0;
  font-size: 10.5px;
  letter-spacing: .12em;
  color: var(--muted);
}
.page-about .about-stats .stat-val {
  margin: 7px 0 0;
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.05;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(28px, 4.4vw, 56px);
}

/* 左侧章节编号栏 */
.page-about .about-rail {
  border-top: 1px solid var(--about-line);
  padding-top: 14px;
}
.page-about .rail-title {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--muted);
}
.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
}
.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px 6px 0;
  font-size: 14px;
  color: var(--about-body);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .rail-no {
  font-size: 11px;
  color: var(--muted);
  transition: color var(--ease);
}
.page-about .rail-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .rail-link:hover .rail-no {
  color: var(--amber);
}

/* 右侧内容列 */
.page-about .about-body {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .sec {
  scroll-margin-top: calc(var(--head-h) + 90px);
}
.page-about .sec + .sec {
  margin-top: clamp(40px, 6vw, 72px);
}
.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 10px;
  margin-bottom: clamp(18px, 2.4vw, 26px);
  border-bottom: 1px solid var(--about-line);
}
.page-about .sec-no {
  flex: none;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
}
.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(20px, 3.4vw, 30px);
  line-height: 1.24;
  letter-spacing: .05em;
  font-weight: 700;
  color: var(--paper);
}

.page-about .para {
  margin: 0 0 1.1em;
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--about-body);
}
.page-about .para:last-child {
  margin-bottom: 0;
}

/* ---------- 01 信息表 ---------- */
.page-about .spec-wrap {
  margin-top: clamp(20px, 2.6vw, 28px);
}
.page-about .spec-cap {
  caption-side: top;
  text-align: left;
  padding: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--muted);
}
.page-about .spec-table th[scope="row"] {
  width: 40%;
  min-width: 110px;
  color: var(--paper);
  font-weight: 500;
  vertical-align: top;
}
.page-about .spec-table td {
  color: var(--about-body);
}

/* ---------- 02 版本分期 ---------- */
.page-about .stage-figure {
  margin: clamp(20px, 2.8vw, 30px) 0 clamp(20px, 2.8vw, 30px);
}

.page-about .stage-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .stage {
  display: grid;
  grid-template-columns: 5px minmax(0, 1fr);
  gap: 16px;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  transition: border-color var(--ease), box-shadow var(--ease);
}
.page-about .stage:hover,
.page-about .stage:focus-within {
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard);
}
.page-about .stage-bar {
  display: block;
  transition: filter var(--ease);
}
.page-about .stage:hover .stage-bar {
  filter: brightness(1.28);
}
.page-about .stage--1 .stage-bar { background: var(--verify); }
.page-about .stage--2 .stage-bar { background: var(--cyan); }
.page-about .stage--3 .stage-bar { background: var(--warn); }
.page-about .stage--4 .stage-bar { background: var(--amber); }

.page-about .stage-body {
  padding: 16px 18px 18px 0;
}
.page-about .stage-range {
  margin: 0;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan);
}
.page-about .stage-name {
  margin: 6px 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  letter-spacing: .06em;
  font-weight: 700;
  color: var(--paper);
}
.page-about .stage-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--about-body);
}
.page-about .stage-note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--about-line);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 03 团队分工 ---------- */
.page-about .team-wrap {
  margin-top: clamp(20px, 2.6vw, 28px);
}
.page-about .team-table th[scope="row"] {
  color: var(--paper);
  font-weight: 500;
  white-space: nowrap;
}
.page-about .team-table td {
  color: var(--about-body);
  line-height: 1.72;
}
.page-about .team-table td.mono {
  color: var(--amber);
  font-size: 17px;
  white-space: nowrap;
}
.page-about .team-table tbody tr {
  transition: background var(--ease);
}
.page-about .team-table tbody tr:hover {
  background: var(--ink-2);
}

.page-about .team-side {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .team-figure {
  margin: 0;
}
.page-about .team-notes .para {
  font-size: 15.5px;
  margin-bottom: .9em;
}

/* ---------- 04 更新与纠错 ---------- */
.page-about .mech-list {
  list-style: none;
  margin: clamp(20px, 2.8vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}
.page-about .mech-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(16px, 2.2vw, 22px) 0;
  border-bottom: 1px solid var(--about-line);
  transition: background var(--ease);
}
.page-about .mech-item:hover {
  background: rgba(19, 41, 61, .55);
}
.page-about .mech-no {
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--amber);
}
.page-about .mech-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  letter-spacing: .05em;
  font-weight: 700;
  color: var(--paper);
}
.page-about .mech-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body);
}
.page-about .mech-body .mono {
  color: var(--cyan);
  font-size: 14.5px;
  word-break: break-all;
}

/* ---------- 05 注册与订阅 ---------- */
.page-about .reg-flow {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .reg-step {
  position: relative;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--cyan);
  background: var(--ink-2);
  padding: 18px 18px 20px;
}
.page-about .reg-no {
  display: inline-block;
  font-size: 24px;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.page-about .reg-step h3 {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  letter-spacing: .05em;
  font-weight: 700;
  color: var(--paper);
}
.page-about .reg-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--about-body);
}

.page-about .reg-paths {
  margin-top: clamp(22px, 3vw, 30px);
  border: 1px solid var(--about-line);
  background: rgba(19, 41, 61, .6);
  padding: clamp(16px, 2.4vw, 24px);
}
.page-about .paths-title {
  margin: 0 0 14px;
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--muted);
}
.page-about .path-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}
.page-about .path-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--about-line);
}
.page-about .path-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .path-text {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-body);
}
.page-about .paths-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-line);
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--about-soft);
}

/* ---------- 06 长期存档 ---------- */
.page-about .archive-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(20px, 2.8vw, 28px);
}
.page-about .tip-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .tip-item {
  padding: 16px 0 18px;
  border-top: 1px solid var(--about-line);
}
.page-about .tip-item:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .tip-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 17px;
  letter-spacing: .05em;
  font-weight: 700;
  color: var(--paper);
  position: relative;
  padding-left: 18px;
}
.page-about .tip-item h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 9px;
  height: 2px;
  background: var(--amber);
}
.page-about .tip-item p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-body);
}
.page-about .archive-figure {
  margin: 0;
}

/* ---------- 07 下一步 ---------- */
.page-about .about-next .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.page-about .next-link {
  display: grid;
  gap: 5px;
  padding: 16px 18px;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  text-decoration: none;
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
}
.page-about .next-link:hover {
  border-color: var(--cyan);
  background: var(--ink);
  transform: translateX(3px);
}
.page-about .next-k {
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--amber);
}
.page-about .next-t {
  font-family: var(--font-head);
  font-size: 17px;
  letter-spacing: .05em;
  font-weight: 700;
  color: var(--paper);
}
.page-about .next-d {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-body);
}

/* ---------- 图片容器补充 ---------- */
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===================================================================
   媒体查询
   =================================================================== */
@media (min-width: 560px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .stage-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .reg-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .path-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 24px;
  }
  .page-about .path-item {
    border-bottom: 0;
    padding-bottom: 0;
  }
  .page-about .about-next .next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .ruler-tick {
    font-size: 11px;
  }
  .page-about .mech-item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }
  .page-about .team-side {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }
  .page-about .archive-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--head-h) + 34px);
    align-self: start;
    border-top: 0;
    border-left: 1px solid var(--about-line);
    padding: 0 0 0 16px;
  }
  .page-about .rail-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }
  .page-about .rail-link {
    width: 100%;
    padding: 7px 0;
    font-size: 14.5px;
  }
  .page-about .about-hero h1 {
    max-width: 24ch;
  }
}

@media (min-width: 1280px) {
  .page-about .about-lead {
    font-size: 17px;
  }
  .page-about .para {
    font-size: 17px;
  }
}

/* 窄屏保护：无横向溢出 */
@media (max-width: 480px) {
  .page-about .about-hero {
    box-shadow: 3px 3px 0 rgba(0, 0, 0, .42);
  }
  .page-about .ruler-tick {
    font-size: 8.5px;
  }
  .page-about .about-stats .stat-val {
    font-size: 20px;
  }
  .page-about .stage-body {
    padding: 14px 14px 16px 0;
  }
}
<<<END>>>