/* ===== 品牌概况 · page-about ===== */

.page-about {
  --about-pad: clamp(20px, 4.5vw, 44px);
  --about-flow: clamp(52px, 7.5vw, 96px);
  background-color: var(--ink-900);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .breadcrumb,
.page-about .about-hero,
.page-about .about-shell {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--about-pad);
  box-sizing: border-box;
}

/* --- 面包屑 --- */
.page-about .breadcrumb {
  padding-top: clamp(22px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
}
.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--mist);
}
.page-about .breadcrumb li + li::before {
  content: "/";
  margin-inline: 10px;
  color: rgba(138, 163, 200, .45);
}
.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--green);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--white);
}

/* --- 首屏 --- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(40px, 7vw, 92px);
  padding-bottom: clamp(30px, 5vw, 58px);
}
.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--green);
  margin: 0 0 clamp(16px, 2vw, 24px);
}
.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(36px, 7.6vw, 86px);
  line-height: 1.03;
  letter-spacing: -0.03em;
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 14ch;
  color: var(--white);
}
.page-about .about-hero__lead {
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--mist);
  max-width: 60ch;
  margin: 0 0 clamp(32px, 4.5vw, 50px);
}
.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(24px, 5vw, 64px);
  list-style: none;
  margin: 0;
  padding: clamp(20px, 3vw, 30px) 0 0;
  border-top: 1px solid var(--edge);
}
.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.page-about .about-hero__stats .mono {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}
.page-about .about-hero__stats em {
  font-style: normal;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* --- 主体框架 --- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
  padding-bottom: clamp(48px, 7vw, 92px);
}
@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 72px;
  }
}

/* --- 侧边章节目录 --- */
.page-about .chapter-nav {
  display: none;
}
@media (min-width: 1080px) {
  .page-about .chapter-nav {
    display: block;
    position: sticky;
    top: 104px;
  }
}
.page-about .chapter-nav__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0 0 16px;
}
.page-about .chapter-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--edge);
}
.page-about .chapter-nav__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 9px 0 9px 16px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--mist);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.35;
  transition: color .2s ease, border-color .2s ease;
}
.page-about .chapter-nav__link .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: rgba(138, 163, 200, .7);
}
.page-about .chapter-nav__link:hover,
.page-about .chapter-nav__link:focus-visible {
  color: var(--white);
  border-left-color: rgba(61, 255, 158, .5);
  outline: none;
}
.page-about .about-shell:has(#about-what:target) .chapter-nav__link[href="#about-what"],
.page-about .about-shell:has(#about-team:target) .chapter-nav__link[href="#about-team"],
.page-about .about-shell:has(#about-review:target) .chapter-nav__link[href="#about-review"],
.page-about .about-shell:has(#about-versions:target) .chapter-nav__link[href="#about-versions"],
.page-about .about-shell:has(#about-pipeline:target) .chapter-nav__link[href="#about-pipeline"],
.page-about .about-shell:has(#about-partners:target) .chapter-nav__link[href="#about-partners"],
.page-about .about-shell:has(#about-why:target) .chapter-nav__link[href="#about-why"] {
  color: var(--white);
  border-left-color: var(--green);
}

/* --- 章节 --- */
.page-about .chapter {
  position: relative;
  padding-block: var(--about-flow);
  border-top: 1px solid var(--edge-soft);
}
.page-about .chapter:first-child {
  border-top: 0;
  padding-top: clamp(24px, 3vw, 36px);
}
.page-about .chapter--indigo {
  background: linear-gradient(150deg, rgba(27, 18, 64, .92), rgba(5, 11, 31, 0) 78%);
  border-radius: var(--radius-lg);
  padding-inline: clamp(20px, 3.5vw, 44px);
  margin-inline: clamp(-20px, -3.5vw, -44px);
}
.page-about .chapter--teal {
  background: linear-gradient(150deg, rgba(6, 48, 44, .9), rgba(5, 11, 31, 0) 78%);
  border-radius: var(--radius-lg);
  padding-inline: clamp(20px, 3.5vw, 44px);
  margin-inline: clamp(-20px, -3.5vw, -44px);
}
.page-about .chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(54px, 10vw, 112px);
  line-height: .82;
  letter-spacing: -0.04em;
  color: rgba(61, 255, 158, .14);
  -webkit-text-stroke: 1.5px rgba(61, 255, 158, .46);
  margin-bottom: clamp(12px, 2vw, 20px);
  user-select: none;
}
.page-about .chapter__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3.9vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  max-width: 20ch;
  color: var(--white);
}
.page-about .chapter__lead {
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--mist);
  max-width: 68ch;
  margin: 0 0 clamp(28px, 4vw, 44px);
}

/* --- 标签行与延伸入口 --- */
.page-about .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .tag-row li {
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--edge);
  font-size: 13.5px;
  color: var(--mist);
}
.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  border: 1px solid var(--edge);
  border-radius: var(--radius-pill);
  color: var(--white);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: border-color .2s ease, color .2s ease, background .2s ease;
}
.page-about .about-link::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--green);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-color: var(--green);
  background: rgba(61, 255, 158, .08);
  outline: none;
}

/* --- 图片容器 --- */
.page-about .about-media {
  margin: 0 0 clamp(30px, 4vw, 46px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--edge-soft);
}
.page-about .about-media img,
.page-about .review-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-media figcaption,
.page-about .review-figure figcaption {
  padding: 14px clamp(18px, 2.5vw, 26px);
  font-size: 13px;
  line-height: 1.62;
  color: var(--mist);
  border-top: 1px solid var(--edge-soft);
}

/* --- 团队角色 --- */
.page-about .role-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 680px) {
  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}
.page-about .role-card {
  background: var(--ink-800);
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius-md);
  padding: clamp(22px, 3vw, 30px);
}
.page-about .role-card__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(32px, 4.4vw, 50px);
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
  margin-bottom: 10px;
}
.page-about .role-card__name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 10px;
  color: var(--white);
}
.page-about .role-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* --- 标签页通用 --- */
.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 clamp(20px, 2.6vw, 28px);
}
.page-about .tabs__tab {
  appearance: none;
  border: 1px solid var(--edge);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.page-about .tabs__tab:hover {
  color: var(--white);
  border-color: rgba(61, 255, 158, .5);
}
.page-about .tabs__tab[aria-selected="true"] {
  background: var(--green);
  border-color: var(--green);
  color: var(--ink-900);
}
.page-about .tabs__tab:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}
.page-about .tabs__panel {
  background: var(--ink-800);
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius-md);
  padding: clamp(22px, 3vw, 32px);
}
.page-about .tabs__panel h3 {
  font-family: var(--font-head);
  font-size: clamp(17px, 2.1vw, 21px);
  font-weight: 800;
  margin: 0 0 12px;
  color: var(--white);
}
.page-about .tabs__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 62ch;
}

/* --- 评测体系 --- */
.page-about .review-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}
@media (min-width: 920px) {
  .page-about .review-layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }
}
.page-about .review-tabs .tabs__panel {
  border-left: 3px solid var(--green);
}
.page-about .review-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--edge-soft);
}

/* --- 版本时间线 --- */
.page-about .version-tabs__list {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: clamp(6px, 2vw, 20px);
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: clamp(20px, 3.5vw, 36px) 0;
}
.page-about .version-tabs__list::before {
  content: "";
  position: absolute;
  left: 2%;
  right: 2%;
  top: 50%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(138, 163, 200, .3), rgba(61, 255, 158, .62) 58%, rgba(255, 122, 47, .62));
  transform: rotate(-2.5deg);
  pointer-events: none;
}
.page-about .tabs__tab.version-node {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  width: clamp(46px, 11vw, 60px);
  height: clamp(46px, 11vw, 60px);
  padding: 0;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink-800);
  border: 2px solid var(--edge);
  color: var(--mist);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(13px, 2.2vw, 16px);
  transition: background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.page-about .tabs__tab.version-node:nth-child(1) { transform: translateY(12px); }
.page-about .tabs__tab.version-node:nth-child(2) { transform: translateY(6px); }
.page-about .tabs__tab.version-node:nth-child(3) { transform: translateY(0); }
.page-about .tabs__tab.version-node:nth-child(4) { transform: translateY(-6px); }
.page-about .tabs__tab.version-node:nth-child(5) { transform: translateY(-12px); }
.page-about .tabs__tab.version-node:hover {
  border-color: rgba(61, 255, 158, .55);
  color: var(--white);
}
.page-about .tabs__tab.version-node[aria-selected="true"] {
  background: var(--green);
  border-color: var(--green);
  color: var(--ink-900);
  box-shadow: 0 0 0 7px rgba(61, 255, 158, .14);
}
.page-about .version-panel {
  border-left: 3px solid var(--orange);
}
.page-about .version-title {
  font-family: var(--font-head);
  font-weight: 800;
}

/* --- 内容生产流程 --- */
.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .flow-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 20px;
  padding: clamp(20px, 2.6vw, 28px) 0;
  border-bottom: 1px solid var(--edge-soft);
}
.page-about .flow-step:first-child {
  border-top: 1px solid var(--edge-soft);
}
.page-about .flow-step__idx {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  color: var(--orange);
  padding-top: 4px;
  letter-spacing: .06em;
}
.page-about .flow-step__body h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  margin: 0 0 8px;
  color: var(--white);
}
.page-about .flow-step__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--mist);
  max-width: 62ch;
}

/* --- 合作生态 --- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: clamp(24px, 3vw, 36px);
}
@media (min-width: 780px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
}
.page-about .partner-stat {
  background: rgba(242, 247, 255, .045);
  border: 1px solid var(--edge-soft);
  border-radius: var(--radius-md);
  padding: clamp(18px, 2.6vw, 26px);
}
.page-about .partner-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  margin-bottom: 10px;
}
.page-about .partner-stat__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--mist);
}
.page-about .partner-note {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 68ch;
}

/* --- 长期价值 --- */
.page-about .why-grid {
  list-style: none;
  margin: 0 0 clamp(34px, 5vw, 52px);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 860px) {
  .page-about .why-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}
.page-about .why-card {
  padding: clamp(24px, 3vw, 32px);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(61, 255, 158, .1), rgba(12, 27, 58, .72) 46%);
  border: 1px solid rgba(61, 255, 158, .18);
}
.page-about .why-card h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17.5px;
  line-height: 1.42;
  margin: 0 0 12px;
  color: var(--white);
}
.page-about .why-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* --- 收尾行动区 --- */
.page-about .about-cta {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: clamp(26px, 4vw, 40px);
  border-radius: var(--radius-lg);
  background: var(--indigo);
  border: 1px solid rgba(255, 122, 47, .26);
}
@media (min-width: 760px) {
  .page-about .about-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
  }
}
.page-about .about-cta p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--white);
  max-width: 52ch;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  flex: 0 0 auto;
}
.page-about .about-cta__actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  font-size: 14.5px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.page-about .about-cta__actions .btn--solid {
  background: var(--green);
  color: var(--ink-900);
}
.page-about .about-cta__actions .btn--ghost {
  background: transparent;
  color: var(--white);
  border-color: var(--edge);
}
.page-about .about-cta__actions .btn--ghost:hover,
.page-about .about-cta__actions .btn--ghost:focus-visible {
  border-color: var(--green);
  outline: none;
}

/* --- 动效降级 --- */
@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-nav__link,
  .page-about .tabs__tab,
  .page-about .about-link,
  .page-about .about-cta__actions .btn {
    transition: none;
  }
  .page-about .tabs__tab.version-node:nth-child(n) {
    transform: none;
  }
}