/* =========================================================
   品牌档案 /company/ —— 页面专属样式
   作用域：.page-about
   ========================================================= */

.page-about {
  --about-rail: 208px;
  --about-rail-gap: 56px;
  --about-cut: polygon(16px 0, 100% 0, 100% 100%, 0 100%, 0 16px);
  position: relative;
  overflow-x: clip;
  padding-bottom: clamp(56px, 8vw, 112px);
  color: var(--ink-100);
  background-color: var(--sea-900);
  background-image:
    radial-gradient(110% 62% at 82% -6%, rgba(53, 224, 214, 0.16), transparent 62%),
    radial-gradient(80% 55% at -8% 22%, rgba(255, 107, 74, 0.08), transparent 60%),
    linear-gradient(180deg, var(--ink-950) 0%, var(--sea-900) 22%, var(--sea-900) 76%, var(--ink-950) 100%);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-cyan) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-cyan) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.5;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.16) 36%, rgba(0, 0, 0, 0.7));
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.16) 36%, rgba(0, 0, 0, 0.7));
}

.page-about > * {
  position: relative;
  z-index: 1;
}

.page-about .about-top {
  padding-top: clamp(20px, 3vw, 32px);
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .breadcrumb a {
  color: var(--cyan-400);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(20px, 4vw, 52px) 0 clamp(24px, 4vw, 46px);
}

.page-about .about-hero .eyebrow {
  color: var(--cyan-400);
  letter-spacing: 0.14em;
  font-size: 0.75rem;
}

.page-about .about-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: 0.02em;
}

.page-about .about-title-main {
  display: block;
  font-size: clamp(2.05rem, 7vw, 4.5rem);
  color: var(--paper-050);
}

.page-about .about-title-sub {
  display: block;
  margin-top: 12px;
  font-size: clamp(1rem, 2.4vw, 1.6rem);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--cyan-400);
}

.page-about .about-hero-lead {
  margin-top: clamp(20px, 3vw, 30px);
  max-width: 64ch;
  font-size: clamp(1rem, 1.25vw, 1.125rem);
  line-height: 1.85;
  color: var(--ink-200);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  clip-path: var(--about-cut);
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(7, 32, 46, 0.92);
}

.page-about .about-stat-num {
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 700;
  color: var(--cyan-400);
  letter-spacing: 0.05em;
}

.page-about .about-stat-label {
  font-size: 0.8125rem;
  color: var(--muted);
  letter-spacing: 0.05em;
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  padding-top: clamp(28px, 5vw, 64px);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

/* ---------- 左侧章节轨道（小屏隐藏） ---------- */

.page-about .about-rail {
  display: none;
}

.page-about .about-rail-title {
  margin: 0 0 14px;
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--slate-500);
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
  position: relative;
}

.page-about .about-rail-list::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 224, 214, 0.7), rgba(53, 224, 214, 0.06));
}

.page-about .about-rail-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-rail-link .mono {
  font-size: 0.6875rem;
  color: var(--slate-500);
  transition: color 0.25s var(--ease);
}

.page-about .about-rail-link::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 15px;
  width: 7px;
  height: 7px;
  background: var(--sea-700);
  transform: rotate(45deg);
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link[aria-current="true"] {
  color: var(--paper-050);
  transform: translateX(3px);
}

.page-about .about-rail-link:hover .mono,
.page-about .about-rail-link[aria-current="true"] .mono {
  color: var(--cyan-400);
}

.page-about .about-rail-link:hover::before,
.page-about .about-rail-link[aria-current="true"]::before {
  background: var(--cyan-400);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  position: relative;
  padding: clamp(30px, 5vw, 58px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-sec-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 4.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(53, 224, 214, 0.6);
  paint-order: stroke;
}

@supports not (-webkit-text-stroke: 1px #fff) {
  .page-about .about-sec-num {
    color: var(--cyan-400);
  }
}

.page-about .about-sec-title {
  margin: 0;
  padding-top: 2px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.2rem, 2.5vw, 1.85rem);
  line-height: 1.28;
  letter-spacing: 0.015em;
  color: var(--paper-050);
}

.page-about .about-copy {
  max-width: 68ch;
}

.page-about .about-copy p {
  font-size: clamp(0.9375rem, 1.1vw, 1.0625rem);
  line-height: 1.85;
  color: var(--ink-200);
}

.page-about .about-copy p + p {
  margin-top: 14px;
}

.page-about .about-copy .about-lead {
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  color: var(--ink-100);
}

.page-about .about-font-note,
.page-about .about-foot-note {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 2px solid var(--line-glass);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 四条主线 ---------- */

.page-about .about-lines {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
}

.page-about .about-line {
  padding: 18px 20px;
  background: var(--sea-800);
  border-left: 2px solid transparent;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-line:hover {
  border-left-color: var(--cyan-400);
  background: var(--sea-700);
}

.page-about .about-line-title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan-400);
}

.page-about .about-line p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-200);
}

/* ---------- 图片 ---------- */

.page-about .about-media {
  margin: clamp(18px, 2.6vw, 28px) 0;
}

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 大屏适配 ---------- */

.page-about .about-copy--tight {
  max-width: 60ch;
}

.page-about .about-devices {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(220px, 1fr);
  gap: 18px;
  margin-top: clamp(20px, 3vw, 30px);
  padding-bottom: 10px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-device {
  scroll-snap-align: start;
}

.page-about .about-device-shape {
  position: relative;
  border: 1px solid var(--line-glass);
  background:
    linear-gradient(158deg, rgba(53, 224, 214, 0.14), rgba(7, 32, 46, 0.72) 62%);
  overflow: hidden;
}

.page-about .about-device-shape::before {
  content: "";
  position: absolute;
  inset: 12% 8%;
  background-image:
    linear-gradient(to right, rgba(53, 224, 214, 0.2) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(53, 224, 214, 0.2) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: 0.6;
}

.page-about .about-device-shape span {
  position: absolute;
  left: 10%;
  bottom: 16%;
  width: 42%;
  height: 6px;
  background: var(--cyan-400);
  opacity: 0.75;
}

.page-about .about-device-shape--tv {
  aspect-ratio: 16 / 9;
}

.page-about .about-device-shape--projector {
  aspect-ratio: 16 / 10;
}

.page-about .about-device-shape--widescreen {
  aspect-ratio: 21 / 9;
}

.page-about .about-device-name {
  margin: 10px 0 0;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 团队折叠卡 ---------- */

.page-about .about-team {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-team-card {
  position: relative;
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(20, 66, 87, 0.55), rgba(7, 32, 46, 0.85));
  clip-path: var(--about-cut);
}

.page-about .about-team-card > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-team-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team-card > summary:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -2px;
}

.page-about .about-team-num {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cyan-400);
}

.page-about .about-team-name {
  flex: 1 1 auto;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper-050);
  letter-spacing: 0.02em;
}

.page-about .about-team-cue {
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--slate-500);
}

.page-about .about-team-card[open] .about-team-cue {
  color: var(--coral-500);
}

.page-about .about-team-body {
  padding: 0 18px 18px;
}

.page-about .about-team-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-200);
}

/* ---------- 发展历程 ---------- */

.page-about .about-phases {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-phase {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 20px 18px;
  background: rgba(12, 44, 62, 0.72);
  border-left: 2px solid var(--line-glass);
  transition: border-color 0.25s var(--ease);
}

.page-about .about-phase:hover {
  border-left-color: var(--cyan-400);
}

.page-about .about-phase-no {
  font-size: clamp(1.1rem, 2.2vw, 1.5rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
  letter-spacing: 0.05em;
}

.page-about .about-phase-title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper-050);
}

.page-about .about-phase-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-200);
}

/* ---------- 标签治理 ---------- */

.page-about .about-rules {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-rules li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 18px;
  background: rgba(12, 44, 62, 0.6);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-rule-key {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--amber-300);
}

.page-about .about-rules p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-200);
}

/* ---------- 规模读数 ---------- */

.page-about .about-readouts {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-readout {
  position: relative;
  padding: 18px 16px 16px;
  background: linear-gradient(160deg, rgba(20, 66, 87, 0.6), rgba(7, 32, 46, 0.88));
  box-shadow: inset 0 0 0 1px var(--line-soft);
  clip-path: var(--about-cut);
}

.page-about .about-readout-value {
  margin: 0;
  font-size: clamp(1.35rem, 3.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--cyan-400);
}

.page-about .about-readout-unit {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--ink-200);
}

.page-about .about-readout-label {
  margin: 8px 0 12px;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-readout .tick-bar {
  display: block;
  height: 3px;
  background: rgba(53, 224, 214, 0.16);
  overflow: hidden;
}

.page-about .about-readout .tick-bar-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-700), var(--cyan-400));
  transform-origin: left center;
  animation: about-bar-grow 0.9s var(--ease) both;
}

.page-about .about-readout--visits .tick-bar-fill { width: 92%; animation-delay: 0.05s; }
.page-about .about-readout--screen .tick-bar-fill { width: 42%; animation-delay: 0.12s; }
.page-about .about-readout--tools .tick-bar-fill { width: 60%; animation-delay: 0.19s; }
.page-about .about-readout--docs .tick-bar-fill { width: 86%; animation-delay: 0.26s; }
.page-about .about-readout--issues .tick-bar-fill { width: 70%; animation-delay: 0.33s; }
.page-about .about-readout--partners .tick-bar-fill { width: 34%; animation-delay: 0.4s; }

@keyframes about-bar-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* ---------- 合作生态 ---------- */

.page-about .about-chips {
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-chips .chip {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  border: 1px solid var(--line-glass);
  color: var(--ink-100);
  background: rgba(12, 44, 62, 0.7);
  padding: 6px 12px;
  display: inline-block;
}

/* ---------- 联系方式 ---------- */

.page-about .about-contact {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
}

.page-about .about-contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 16px 18px;
  background: var(--sea-800);
}

.page-about .about-contact-key {
  flex: 0 0 auto;
  min-width: 5.5em;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--slate-500);
}

.page-about .about-contact-value {
  flex: 1 1 auto;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--paper-050);
  word-break: break-word;
}

.page-about .about-contact .copy-btn {
  flex: 0 0 auto;
  border: 1px solid var(--line-glass);
  background: transparent;
  color: var(--cyan-400);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  padding: 6px 10px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-contact .copy-btn:hover {
  background: rgba(53, 224, 214, 0.12);
}

.page-about .about-contact .copy-btn:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-about .about-contact .copy-btn[data-copied="true"] {
  color: var(--ink-950);
  background: var(--cyan-400);
  border-color: var(--cyan-400);
}

/* ---------- 章节收尾动作 ---------- */

.page-about .action-row {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 平板以上 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .about-contact-item {
    flex-wrap: nowrap;
  }
}

/* ---------- 桌面：左轨道 + 右内容 ---------- */

@media (min-width: 1024px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-rail-gap);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
    max-height: calc(100vh - 148px);
    overflow-y: auto;
    padding: 4px 0;
  }

  .page-about .about-devices {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-about .about-phases {
    gap: 0;
    border-left: 1px solid var(--line-soft);
    padding-left: 0;
  }

  .page-about .about-phase {
    margin-left: -1px;
    border-left-width: 2px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-section--wide {
    margin-inline: -36px;
    padding-inline: 36px;
    background: linear-gradient(122deg, rgba(53, 224, 214, 0.08), rgba(12, 44, 62, 0) 58%);
  }
}

@media (min-width: 1360px) {
  .page-about .about-copy {
    max-width: 72ch;
  }
}

/* ---------- 无障碍与降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-readout .tick-bar-fill {
    animation: none;
    transform: none;
  }

  .page-about .about-rail-link,
  .page-about .about-line,
  .page-about .about-team-card,
  .page-about .about-phase {
    transition: none;
  }

  .page-about .about-rail-link:hover {
    transform: none;
  }
}
<<<END>>>