.page-about {
  --ab-stream: 720px;
  --ab-radius-frame: 24px;
  display: block;
}

.page-about .breadcrumb {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 62px) 0 clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(88% 130% at 86% -18%, rgba(182, 255, 60, 0.13), transparent 62%),
    linear-gradient(180deg, rgba(20, 26, 22, 0.92), rgba(11, 14, 12, 0));
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(201, 209, 204, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(201, 209, 204, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 100% at 50% 0, #000 0%, transparent 74%);
  mask-image: radial-gradient(120% 100% at 50% 0, #000 0%, transparent 74%);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  max-width: 20em;
  font-size: clamp(29px, 5.2vw, 60px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-hero__lead {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (min-width: 760px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px 20px;
  background: var(--panel);
}

.page-about .ab-fact__num {
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--signal);
}

.page-about .ab-fact__label {
  font-size: 12px;
  letter-spacing: 0.09em;
  color: var(--muted);
}

/* ---------- 时间轴分屏 ---------- */
.page-about .ab-timeline {
  padding: clamp(36px, 6vw, 82px) 0;
}

.page-about .ab-timeline__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  align-items: start;
}

@media (min-width: 1000px) {
  .page-about .ab-timeline__inner {
    grid-template-columns: minmax(158px, 3.4fr) minmax(0, 8.6fr);
    gap: clamp(36px, 4vw, 76px);
  }
}

.page-about .ab-rail {
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .ab-rail {
    position: sticky;
    top: 136px;
    align-self: start;
  }
}

.page-about .ab-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .ab-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .ab-rail__item {
  flex: 0 0 auto;
}

.page-about .ab-rail__link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 13px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--panel);
  text-decoration: none;
  white-space: nowrap;
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-rail__span {
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--silver);
}

.page-about .ab-rail__name {
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

@media (min-width: 1000px) {
  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-rail__item {
    flex: 0 0 auto;
  }

  .page-about .ab-rail__link {
    position: relative;
    padding: 11px 14px 11px 20px;
    border: 0;
    border-radius: 0;
    background: transparent;
    white-space: normal;
  }

  .page-about .ab-rail__link::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 9px;
    bottom: 9px;
    width: 2px;
    border-radius: 2px;
    background: transparent;
    transition: background 200ms var(--ease);
  }

  .page-about .ab-rail__link:hover::before,
  .page-about .ab-rail__link[aria-current]::before {
    background: var(--signal);
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link[aria-current] {
    background: linear-gradient(90deg, rgba(182, 255, 60, 0.1), transparent 74%);
  }

  .page-about .ab-rail__link:hover .ab-rail__name,
  .page-about .ab-rail__link[aria-current] .ab-rail__name {
    color: var(--signal);
  }

  .page-about .ab-rail__link[aria-current] .ab-rail__span {
    color: var(--paper);
  }
}

.page-about .ab-stream {
  display: grid;
  gap: clamp(30px, 4vw, 52px);
  min-width: 0;
}

/* ---------- 条形图 ---------- */
.page-about .ab-bars {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(165deg, rgba(20, 26, 22, 1), rgba(11, 14, 12, 1));
}

.page-about .ab-bars__title {
  margin: 0 0 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .ab-bar {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 42px;
  align-items: center;
  gap: 10px;
  padding: 5px 0;
  border-radius: var(--radius-sm);
  transition: background 180ms var(--ease);
}

.page-about .ab-bar:hover {
  background: var(--line);
}

.page-about .ab-bar__span {
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .ab-bar__track {
  display: block;
  height: 10px;
  border-radius: var(--pill);
  background: var(--line);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--grass), var(--signal));
}

.page-about .ab-bar__fill--1 { width: 47%; }
.page-about .ab-bar__fill--2 { width: 82%; }
.page-about .ab-bar__fill--3 { width: 95%; }
.page-about .ab-bar__fill--4 { width: 100%; }
.page-about .ab-bar__fill--5 { width: 59%; }
.page-about .ab-bar__fill--6 { width: 51%; }

.page-about .ab-bar__num {
  font-size: 13px;
  text-align: right;
  color: var(--silver);
}

.page-about .ab-bars__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 阶段长文 ---------- */
.page-about .ab-stage {
  padding-top: clamp(16px, 2.4vw, 26px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 140px;
}

.page-about .ab-stage__span {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 13px;
  border-radius: var(--pill);
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--signal);
}

.page-about .ab-stage__title {
  margin: 0 0 14px;
  max-width: 22em;
  font-size: clamp(20px, 2.5vw, 27px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-stage p {
  max-width: 66ch;
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--silver);
}

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

.page-about .ab-stage a,
.page-about .ab-col__text a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(182, 255, 60, 0.35);
  transition: border-color 160ms var(--ease);
}

.page-about .ab-stage a:hover,
.page-about .ab-col__text a:hover {
  border-bottom-color: var(--signal);
}

/* ---------- 三条产品线 ---------- */
.page-about .ab-series {
  padding: clamp(40px, 6vw, 88px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-series__head {
  max-width: 720px;
}

.page-about .ab-series__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-series__lead {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-series__media {
  margin: clamp(24px, 3.4vw, 40px) 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--panel);
}

.page-about .ab-series__media img,
.page-about .ab-build__figure img,
.page-about .ab-qc__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-figure__cap {
  padding: 12px 18px 14px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--muted);
  background: var(--panel);
}

.page-about .ab-lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 820px) {
  .page-about .ab-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .ab-line {
  position: relative;
  overflow: hidden;
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(20, 26, 22, 1) 0%, rgba(11, 14, 12, 1) 100%);
}

.page-about .ab-line::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: var(--ab-line-color, var(--signal));
}

.page-about .ab-line--grass { --ab-line-color: var(--grass); }
.page-about .ab-line--signal { --ab-line-color: var(--signal); }
.page-about .ab-line--silver { --ab-line-color: var(--silver); }

.page-about .ab-line__tag {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .ab-line__title {
  margin: 0 0 12px;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 800;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .ab-line__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 制造基地 ---------- */
.page-about .ab-build {
  padding: clamp(40px, 6vw, 86px) 0;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20, 26, 22, 0.55), rgba(11, 14, 12, 0));
}

.page-about .ab-build__head {
  max-width: 760px;
}

.page-about .ab-build__title {
  margin: 10px 0 0;
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-build__lead {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-build__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(24px, 4vw, 44px);
}

@media (min-width: 900px) {
  .page-about .ab-build__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(26px, 3.4vw, 46px);
  }
}

.page-about .ab-build__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--panel);
}

.page-about .ab-build__sub {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.4;
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-build__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-specs {
  display: grid;
  gap: 0;
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-specs li {
  display: grid;
  grid-template-columns: 8px minmax(0, 1fr);
  gap: 13px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .ab-specs li:first-child {
  border-top: 1px dashed var(--line);
}

.page-about .ab-specs li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 9px;
  border-radius: 2px;
  background: var(--signal);
}

.page-about .ab-qc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: center;
  margin-top: clamp(28px, 4vw, 52px);
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(90% 140% at 100% 0%, rgba(122, 204, 43, 0.1), transparent 60%),
    linear-gradient(150deg, rgba(20, 26, 22, 0.98), rgba(11, 14, 12, 0.98));
}

@media (min-width: 820px) {
  .page-about .ab-qc {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }
}

.page-about .ab-qc__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink);
}

.page-about .ab-qc__title {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.1vw, 23px);
  line-height: 1.35;
  font-weight: 800;
  color: var(--paper);
}

.page-about .ab-qc__body p {
  margin: 0 0 1em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--silver);
}

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

/* ---------- 认证与服务 ---------- */
.page-about .ab-assure {
  padding: clamp(40px, 6vw, 86px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-assure__title {
  margin: 0 0 clamp(24px, 3.4vw, 42px);
  font-size: clamp(23px, 3.2vw, 38px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-assure__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
}

@media (min-width: 940px) {
  .page-about .ab-assure__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

.page-about .ab-col__sub {
  margin: 0 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-weight: 600;
}

.page-about .ab-col__intro {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-col__text {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-col__text strong {
  color: var(--paper);
  font-weight: 700;
}

.page-about .ab-cert {
  margin-bottom: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 200ms var(--ease);
}

.page-about .ab-cert:hover,
.page-about .ab-cert[open] {
  border-color: rgba(201, 209, 204, 0.24);
}

.page-about .ab-cert__summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 14px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-cert__summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-cert__summary::after {
  content: "＋";
  margin-left: 6px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--signal);
}

.page-about .ab-cert[open] .ab-cert__summary::after {
  content: "－";
}

.page-about .ab-cert__code {
  flex: 0 0 auto;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--ink);
  font-size: 10.5px;
  letter-spacing: 0.07em;
  color: var(--silver);
}

.page-about .ab-cert__label {
  min-width: 0;
  line-height: 1.45;
}

.page-about .ab-cert__scope {
  margin-left: auto;
  flex: 0 0 auto;
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

@media (max-width: 560px) {
  .page-about .ab-cert__scope {
    display: none;
  }
}

.page-about .ab-cert__body {
  margin: 0;
  padding: 14px 16px 18px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .ab-service {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-service li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .ab-service li:first-child {
  border-top: 1px solid var(--line);
}

.page-about .ab-service__num {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--signal);
}

/* ---------- 收束 ---------- */
.page-about .ab-cta {
  padding: clamp(38px, 6vw, 78px) 0 clamp(46px, 7vw, 94px);
  border-top: 1px solid var(--line);
}

.page-about .ab-cta__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 160% at 0% 0%, rgba(182, 255, 60, 0.14), transparent 58%),
    linear-gradient(150deg, rgba(20, 26, 22, 1), rgba(11, 14, 12, 1));
}

.page-about .ab-cta__panel::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--signal), transparent);
  opacity: 0.7;
}

.page-about .ab-cta__title {
  margin: 0;
  font-size: clamp(21px, 2.8vw, 32px);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-cta__text {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 28px);
}

.page-about .ab-cta__links {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-cta__links a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .ab-cta__links a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 420px) {
  .page-about .ab-bar {
    grid-template-columns: 74px minmax(0, 1fr) 36px;
    gap: 8px;
  }

  .page-about .ab-bar__span {
    font-size: 10px;
  }

  .page-about .ab-service li {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__link,
  .page-about .ab-cert,
  .page-about .ab-bar {
    transition: none;
  }
}