/* ===== 品牌档案页 · page-about ===== */
.page-about {
  --about-edge: linear-gradient(180deg, var(--purple), var(--blue) 52%, var(--green));
  --about-lift: 0 26px 60px -34px rgba(0, 0, 0, .98), 0 0 0 1px rgba(123, 63, 242, .3);
  position: relative;
  padding-bottom: clamp(56px, 9vw, 112px);
  color: var(--stardust);
}

.page-about .tt-crumbs {
  padding-top: clamp(20px, 4vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(26px, 6vw, 62px) 0 clamp(26px, 5vw, 48px);
  border-bottom: var(--border-print);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(77, 255, 166, .16);
  animation: about-pulse 2.6s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(77, 255, 166, .16); }
  50% { box-shadow: 0 0 0 8px rgba(77, 255, 166, .04); }
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 19ch;
  font-family: var(--font-head);
  font-size: clamp(30px, 6.6vw, 58px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.022em;
  color: var(--stardust);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 44ch;
  font-size: clamp(15.5px, 1.8vw, 17px);
  line-height: 1.9;
  color: var(--stardust);
  opacity: .84;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 12px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stat {
  padding: 16px 18px 18px;
  border: var(--border-print);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(123, 63, 242, .18), rgba(16, 36, 58, .62));
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--orange);
}

.page-about .about-hero__stat span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-top: clamp(48px, 8vw, 96px);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: flex-end;
  gap: clamp(14px, 3vw, 28px);
  padding-bottom: 16px;
  border-bottom: var(--border-print);
}

.page-about .about-chapter__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(48px, 11vw, 100px);
  font-weight: 700;
  line-height: .84;
  letter-spacing: -.05em;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--purple);
}

@supports not ((-webkit-background-clip: text) or (background-clip: text)) {
  .page-about .about-chapter__num {
    background: none;
    -webkit-text-fill-color: currentColor;
    color: var(--purple);
  }
}

.page-about .about-chapter__title {
  margin: 0 0 4px;
  font-family: var(--font-head);
  font-size: clamp(20px, 3.6vw, 32px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -.01em;
  color: var(--stardust);
}

.page-about .about-chapter__intro {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 50ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-chapter__body {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
  padding-top: clamp(22px, 4vw, 36px);
}

/* ---------- 正文与图 ---------- */
.page-about .about-prose p {
  margin: 0 0 1.05em;
  max-width: 44ch;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--stardust);
  opacity: .84;
}

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

.page-about .about-figure {
  position: relative;
  margin: 0;
  border: var(--border-print);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(123, 63, 242, .3), rgba(47, 182, 255, .14) 58%, rgba(58, 15, 42, .5));
  box-shadow: var(--shadow-card);
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 26px;
  height: 26px;
  background: linear-gradient(135deg, transparent 50%, rgba(255, 209, 102, .55) 50%);
  pointer-events: none;
}

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

.page-about .about-figure--band {
  margin-top: clamp(20px, 4vw, 32px);
  border-radius: var(--radius);
}

/* ---------- 团队档案卡 ---------- */
.page-about .about-crew {
  display: grid;
  gap: clamp(16px, 3vw, 20px);
  margin: clamp(26px, 5vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__card {
  position: relative;
  padding: 24px 22px;
  border: var(--border-print);
  border-radius: var(--radius);
  background:
    linear-gradient(162deg, rgba(16, 36, 58, .94), rgba(11, 10, 31, .96)),
    var(--ink-900);
  box-shadow: var(--shadow-card);
  transition: transform .35s ease, border-color .35s ease, box-shadow .35s ease;
}

.page-about .about-crew__card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  border-radius: var(--radius) var(--radius) 0 0;
  background: var(--grad-brand);
  opacity: .7;
  transition: opacity .35s ease;
}

.page-about .about-crew__card:hover,
.page-about .about-crew__card:focus-within {
  transform: translateY(-6px);
  border-color: rgba(123, 63, 242, .62);
  box-shadow: var(--about-lift);
}

.page-about .about-crew__card:hover::before,
.page-about .about-crew__card:focus-within::before {
  opacity: 1;
}

.page-about .about-crew__index {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
  border: 1px dashed rgba(255, 209, 102, .55);
  border-radius: 6px;
}

.page-about .about-crew__name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--stardust);
}

.page-about .about-crew__desc {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--stardust);
  opacity: .8;
}

.page-about .about-crew__note {
  display: inline-block;
  margin: 0;
  padding-top: 12px;
  border-top: var(--border-print);
  width: 100%;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--green);
  transition: color .3s ease;
}

.page-about .about-crew__card:hover .about-crew__note {
  color: var(--amber);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-tl {
  position: relative;
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: var(--about-edge);
  opacity: .72;
}

.page-about .about-tl__item {
  position: relative;
}

.page-about .about-tl__item + .about-tl__item {
  margin-top: 4px;
}

.page-about .about-tl__node {
  border-bottom: var(--border-print);
}

.page-about .about-tl__summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 18px 0;
  list-style: none;
  cursor: pointer;
  transition: color .3s ease;
}

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

.page-about .about-tl__summary::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--amber);
  box-shadow: 0 0 0 0 rgba(77, 255, 166, 0);
  transition: border-color .3s ease, box-shadow .3s ease;
}

.page-about .about-tl__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--mist);
  transition: color .3s ease;
}

.page-about .about-tl__node[open] .about-tl__summary::before {
  border-color: var(--green);
  box-shadow: 0 0 0 5px rgba(77, 255, 166, .16);
}

.page-about .about-tl__node[open] .about-tl__summary::after {
  content: "−";
  color: var(--green);
}

.page-about .about-tl__summary:hover .about-tl__title {
  color: var(--blue);
}

.page-about .about-tl__year {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--orange);
}

.page-about .about-tl__title {
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--stardust);
  transition: color .3s ease;
}

.page-about .about-tl__ver {
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--amber);
  border: 1px dashed rgba(255, 209, 102, .5);
  border-radius: 5px;
}

.page-about .about-tl__panel {
  padding: 2px 0 20px;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
  animation: about-open .32s ease;
}

.page-about .about-tl__panel p {
  margin: 0;
}

@keyframes about-open {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-rhythm__item {
  padding: 22px 20px 24px;
  border: 1px solid rgba(255, 209, 102, .22);
  border-radius: var(--radius);
  background: linear-gradient(178deg, rgba(58, 15, 42, .62), rgba(11, 10, 31, .9));
  box-shadow: var(--shadow-card);
  transition: transform .35s ease, border-color .35s ease;
}

.page-about .about-rhythm__item:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 209, 102, .48);
}

.page-about .about-rhythm__cycle {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .about-rhythm__name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--stardust);
}

.page-about .about-rhythm__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-rhythm__tail {
  margin: 22px 0 0;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 文字链接 ---------- */
.page-about a:not([class]) {
  color: var(--blue);
  text-decoration: underline;
  text-decoration-color: rgba(47, 182, 255, .45);
  text-underline-offset: 3px;
  transition: color .25s ease, text-decoration-color .25s ease;
}

.page-about a:not([class]):hover,
.page-about a:not([class]):focus-visible {
  color: var(--green);
  text-decoration-color: rgba(77, 255, 166, .7);
}

/* ---------- 联系与动作 ---------- */
.page-about .about-contact {
  margin-top: clamp(28px, 5vw, 46px);
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid rgba(255, 209, 102, .24);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(168deg, rgba(58, 15, 42, .78), rgba(11, 10, 31, .94));
  box-shadow: var(--shadow-card);
}

.page-about .about-contact__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.6vw, 23px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--stardust);
}

.page-about .about-contact__lede {
  margin: 0 0 22px;
  max-width: 50ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-contact__list {
  display: grid;
  gap: 2px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(167, 159, 201, .18);
}

.page-about .about-contact__row:last-child {
  border-bottom: none;
}

.page-about .about-contact__key {
  flex: none;
  min-width: 72px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-contact__val {
  font-size: 15px;
  line-height: 1.6;
  color: var(--stardust);
  word-break: break-word;
}

.page-about .about-contact__val--mono {
  font-family: var(--font-mono);
  color: var(--green);
}

.page-about .about-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-crew__card:nth-child(even) {
    margin-top: 26px;
  }

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

@media (min-width: 880px) {
  .page-about .about-chapter__body--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
    align-items: start;
  }

  .page-about .about-chapter__body--flip {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1fr);
  }

  .page-about .about-chapter__body--split .about-figure {
    position: sticky;
    top: 88px;
  }

  .page-about .about-tl {
    padding-left: 40px;
  }

  .page-about .about-tl::before {
    left: 13px;
  }

  .page-about .about-tl__summary {
    display: grid;
    grid-template-columns: 132px minmax(0, 1fr) auto auto;
    align-items: baseline;
    gap: 0 22px;
    padding: 22px 0;
  }

  .page-about .about-tl__summary::before {
    left: -32px;
    top: 30px;
    width: 11px;
    height: 11px;
  }

  .page-about .about-tl__title {
    font-size: 16.5px;
  }

  .page-about .about-tl__panel {
    padding-left: 154px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__stats {
    max-width: 720px;
  }

  .page-about .about-tl__year {
    font-size: 40px;
  }
}

@media (max-width: 420px) {
  .page-about .about-tl {
    padding-left: 28px;
  }

  .page-about .about-tl::before {
    left: 8px;
  }

  .page-about .about-tl__summary::before {
    left: -25px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__eyebrow::before {
    animation: none;
  }

  .page-about .about-crew__card,
  .page-about .about-rhythm__item,
  .page-about .about-tl__summary,
  .page-about .about-tl__panel {
    transition: none;
    animation: none;
  }

  .page-about .about-crew__card:hover,
  .page-about .about-crew__card:focus-within,
  .page-about .about-rhythm__item:hover {
    transform: none;
  }
}