/* ===== 品牌与团队页 · page-about ===== */
.page-about {
  --about-ink-on-paper: #10312A;
  --about-muted-on-paper: #4E625C;
  --about-cyan-deep: #0A6B5A;
  --about-line-dark: rgba(53, 240, 208, 0.16);
  --about-line-darker: rgba(243, 237, 225, 0.08);
  display: block;
  background: var(--ink-950);
  color: var(--white-0);
}

.page-about .eyebrow {
  color: var(--cyan-400);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 3vw, 32px) 0 clamp(38px, 6vw, 74px);
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: clamp(18px, 3vw, 30px);
  padding: clamp(22px, 4vw, 48px);
  border: 1px solid var(--about-line-dark);
  border-radius: var(--r-xl);
  background:
    radial-gradient(120% 96% at 90% -12%, rgba(53, 240, 208, 0.16), transparent 58%),
    radial-gradient(90% 80% at 0% 120%, rgba(255, 122, 46, 0.08), transparent 60%),
    var(--ink-800);
  overflow: hidden;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px dashed rgba(243, 237, 225, 0.09);
  border-radius: calc(var(--r-xl) - 10px);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__intro h1 {
  margin: 14px 0 0;
  font-size: clamp(27px, 4.8vw, 50px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.82;
  color: rgba(243, 237, 225, 0.8);
}

.page-about .about-hero__tags {
  margin-top: 22px;
}

.page-about .about-hero__readout {
  padding: 22px 20px;
  border: 1px solid var(--about-line-dark);
  border-radius: var(--r-lg);
  background: rgba(5, 17, 14, 0.72);
}

.page-about .about-hero__readout-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gray-400);
}

.page-about .about-hero__version {
  margin: 8px 0 18px;
  font-size: clamp(44px, 9vw, 62px);
  line-height: 1;
  font-weight: 700;
  color: var(--orange-500);
}

.page-about .about-hero__meta {
  margin: 0;
  border-top: 1px solid var(--about-line-darker);
}

.page-about .about-hero__meta-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-line-darker);
}

.page-about .about-hero__meta-row dt {
  font-size: 13.5px;
  color: rgba(243, 237, 225, 0.66);
}

.page-about .about-hero__meta-row dd {
  margin: 0;
  font-size: 13.5px;
  color: var(--cyan-200);
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ---------- 版本长卷 ---------- */
.page-about .about-archive {
  padding: clamp(42px, 7vw, 88px) 0;
  background: linear-gradient(180deg, var(--ink-950) 0%, var(--ink-800) 38%, var(--ink-800) 68%, var(--ink-950) 100%);
}

.page-about .about-archive .section-head__title {
  color: var(--white-0);
}

.page-about .about-archive .section-head__text {
  color: rgba(243, 237, 225, 0.72);
}

.page-about .about-archive__visual {
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--about-line-dark);
  border-radius: var(--r-lg);
  overflow: hidden;
}

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

.page-about .vtrack {
  position: relative;
  margin: clamp(30px, 4.5vw, 52px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .vtrack::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(53, 240, 208, 0.85), rgba(53, 240, 208, 0.1));
}

.page-about .vtrack__item {
  position: relative;
  padding-left: 48px;
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .vtrack__item:last-child {
  margin-bottom: 0;
}

.page-about .vtrack__num {
  position: absolute;
  left: 0;
  top: 14px;
  width: 34px;
  padding: 4px 0;
  text-align: center;
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--cyan-400);
  background: #061713;
  border: 1px solid rgba(53, 240, 208, 0.4);
  border-radius: var(--r-pill);
}

.page-about .vnode {
  border: 1px solid rgba(53, 240, 208, 0.14);
  border-radius: var(--r-lg);
  background: rgba(11, 33, 27, 0.74);
  overflow: hidden;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .vnode[open] {
  border-color: rgba(53, 240, 208, 0.36);
  background: rgba(11, 33, 27, 0.94);
}

.page-about .vnode__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .vnode__head:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -3px;
}

.page-about .vnode__title {
  margin: 0;
  font-size: clamp(16px, 2.1vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white-0);
}

.page-about .vnode__more {
  position: relative;
  flex: 0 0 auto;
  margin-left: auto;
  width: 24px;
  height: 24px;
  border: 1px solid rgba(53, 240, 208, 0.45);
  border-radius: 50%;
}

.page-about .vnode__more::before,
.page-about .vnode__more::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 1.5px;
  background: var(--cyan-400);
  transform: translate(-50%, -50%);
  transition: transform 0.28s var(--ease);
}

.page-about .vnode__more::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-about .vnode[open] .vnode__more::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.page-about .vnode__body {
  padding: 0 18px 20px;
  border-top: 1px solid var(--about-line-darker);
}

.page-about .vnode__body p {
  margin: 16px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(243, 237, 225, 0.76);
}

.page-about .vnode__list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .vnode__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(166, 248, 232, 0.9);
}

.page-about .vnode__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-400);
  opacity: 0.7;
}

/* ---------- 团队（暖纸底） ---------- */
.page-about .about-team {
  padding: clamp(42px, 7vw, 88px) 0;
  background: var(--paper-100);
  color: var(--about-ink-on-paper);
}

.page-about .about-team .eyebrow {
  color: var(--about-cyan-deep);
}

.page-about .about-team .section-head__title {
  color: var(--about-ink-on-paper);
}

.page-about .about-team .section-head__text {
  color: var(--about-muted-on-paper);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--paper-300);
}

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

.page-about .about-team__panel {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--r-lg);
  background: rgba(222, 211, 190, 0.5);
  border: 1px solid rgba(16, 49, 42, 0.1);
}

.page-about .ringwrap {
  position: relative;
  width: clamp(150px, 44vw, 190px);
  margin: 0 0 22px;
}

.page-about .ring {
  display: block;
  width: 100%;
  height: auto;
  transform: rotate(-90deg);
}

.page-about .ring__track {
  stroke: rgba(16, 49, 42, 0.12);
}

.page-about .ring__seg {
  transition: opacity 0.28s var(--ease);
}

.page-about .ring__seg--a {
  stroke: #0E9E87;
}

.page-about .ring__seg--b {
  stroke: #FF7A2E;
}

.page-about .ring__seg--c {
  stroke: #2E6B5A;
}

.page-about .ring:hover .ring__seg {
  opacity: 0.5;
}

.page-about .ring .ring__seg:hover {
  opacity: 1;
}

.page-about .ringwrap__label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  color: var(--about-ink-on-paper);
  line-height: 1;
}

.page-about .ringwrap__unit {
  margin-top: 4px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--about-muted-on-paper);
}

.page-about .roles {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .roles__item {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid rgba(16, 49, 42, 0.12);
}

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

.page-about .roles__dot {
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border-radius: 50%;
}

.page-about .roles__dot--a {
  background: #0E9E87;
}

.page-about .roles__dot--b {
  background: #FF7A2E;
}

.page-about .roles__dot--c {
  background: #2E6B5A;
}

.page-about .roles__name {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--about-ink-on-paper);
}

.page-about .roles__desc {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-muted-on-paper);
}

.page-about .about-team__note {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--about-cyan-deep);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(222, 211, 190, 0.42);
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-on-paper);
}

/* ---------- 节奏与把关 ---------- */
.page-about .about-cadence {
  padding: clamp(42px, 7vw, 88px) 0;
  background: var(--ink-950);
}

.page-about .about-cadence .section-head__title {
  color: var(--white-0);
}

.page-about .about-cadence .section-head__text {
  color: rgba(243, 237, 225, 0.72);
}

.page-about .cadence {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 22px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .cadence__item {
  position: relative;
  padding: clamp(22px, 3.4vw, 30px);
  border: 1px solid var(--about-line-dark);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(22, 51, 43, 0.9), rgba(11, 33, 27, 0.85));
}

.page-about .cadence__idx {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange-500);
}

.page-about .cadence__title {
  margin: 14px 0 0;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--white-0);
}

.page-about .cadence__text {
  margin: 12px 0 0;
  font-size: 14.8px;
  line-height: 1.8;
  color: rgba(243, 237, 225, 0.74);
}

/* ---------- 覆盖与规模 ---------- */
.page-about .about-coverage {
  padding: clamp(42px, 7vw, 88px) 0;
  background:
    radial-gradient(80% 60% at 8% 0%, rgba(255, 122, 46, 0.1), transparent 62%),
    var(--ink-950);
}

.page-about .about-coverage .section-head__title {
  color: var(--white-0);
}

.page-about .about-coverage .section-head__text {
  color: rgba(243, 237, 225, 0.72);
}

.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 36px);
  margin-top: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .cover-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: rgba(53, 240, 208, 0.18);
}

.page-about .cover-stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 3vw, 26px);
  background: var(--ink-800);
}

.page-about .cover-stat--wide {
  grid-column: 1 / -1;
  background: #081914;
}

.page-about .cover-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 5.2vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange-500);
}

.page-about .cover-stat__label {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(243, 237, 225, 0.7);
}

.page-about .about-coverage__figure {
  margin: 0;
  padding: clamp(16px, 2.6vw, 22px);
  border: 1px solid var(--about-line-dark);
  border-radius: var(--r-lg);
  background: rgba(11, 33, 27, 0.6);
}

.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-md);
}

.page-about .about-coverage__cap {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--orange-200);
}

/* ---------- 数据来源（暖纸底） ---------- */
.page-about .about-sources {
  padding: clamp(42px, 7vw, 88px) 0;
  background: var(--paper-100);
  color: var(--about-ink-on-paper);
}

.page-about .about-sources .eyebrow {
  color: var(--about-cyan-deep);
}

.page-about .about-sources .section-head__title {
  color: var(--about-ink-on-paper);
}

.page-about .about-sources .section-head__text {
  color: var(--about-muted-on-paper);
}

.page-about .sources {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 22px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .sources__item {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--r-lg);
  border: 1px solid rgba(16, 49, 42, 0.14);
  background: rgba(255, 255, 255, 0.55);
}

.page-about .sources__title {
  margin: 0;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  color: var(--about-ink-on-paper);
}

.page-about .sources__title::after {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  margin-top: 10px;
  border-radius: 2px;
  background: var(--about-cyan-deep);
}

.page-about .sources__item p {
  margin: 12px 0 0;
  font-size: 14.8px;
  line-height: 1.8;
  color: var(--about-muted-on-paper);
}

.page-about .about-sources__links {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(16, 49, 42, 0.14);
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-muted-on-paper);
}

.page-about .about-sources__links a {
  color: var(--about-cyan-deep);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid rgba(10, 107, 90, 0.35);
  padding-bottom: 1px;
}

.page-about .about-sources__links a:hover,
.page-about .about-sources__links a:focus-visible {
  border-bottom-color: var(--about-cyan-deep);
}

/* ---------- 联系 ---------- */
.page-about .about-contact {
  padding: clamp(42px, 7vw, 88px) 0;
  background: linear-gradient(180deg, var(--ink-950), #030D0A);
}

.page-about .about-contact__panel {
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--about-line-dark);
  border-radius: var(--r-xl);
  background:
    radial-gradient(100% 80% at 100% 0%, rgba(53, 240, 208, 0.12), transparent 60%),
    rgba(11, 33, 27, 0.8);
}

.page-about .about-contact__title {
  margin: 12px 0 0;
  font-size: clamp(21px, 3.2vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--white-0);
}

.page-about .about-contact__text {
  margin: 14px 0 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(243, 237, 225, 0.76);
}

.page-about .about-contact__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(22px, 3.4vw, 32px);
  border-radius: var(--r-md);
  overflow: hidden;
  background: rgba(53, 240, 208, 0.16);
}

.page-about .contact-cell {
  padding: 16px 18px;
  background: #061814;
}

.page-about .contact-cell__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gray-400);
}

.page-about .contact-cell__value {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cyan-200);
  word-break: break-word;
}

.page-about .contact-cell__value a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(166, 248, 232, 0.4);
}

.page-about .contact-cell__value a:hover,
.page-about .contact-cell__value a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 30px);
}

.page-about .about-contact__icp {
  margin: 22px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gray-400);
}

/* ---------- 回到顶部 ---------- */
.page-about .about-top {
  position: fixed;
  right: 16px;
  bottom: 18px;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(53, 240, 208, 0.4);
  background: rgba(5, 17, 14, 0.86);
  color: var(--cyan-400);
  font-size: 17px;
  line-height: 1;
  text-decoration: none;
  backdrop-filter: blur(6px);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  transform: translateY(-3px);
  border-color: var(--cyan-400);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 780px) {
  .page-about .vtrack::before {
    left: 40px;
  }

  .page-about .vtrack__item {
    padding-left: 108px;
  }

  .page-about .vtrack__num {
    width: 80px;
    top: 12px;
    font-size: 13px;
    padding: 6px 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(250px, 0.8fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 0.86fr);
    align-items: start;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  }

  .page-about .vnode__head {
    padding: 18px 24px;
  }

  .page-about .vnode__body {
    padding: 0 24px 24px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-top {
    right: 26px;
    bottom: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .vnode,
  .page-about .ring__seg,
  .page-about .vnode__more::before,
  .page-about .vnode__more::after,
  .page-about .about-top {
    transition: none;
  }
}