.page-about {
  --about-text: 40em;
  --about-band-h: 5px;
}

.page-about .container {
  width: 100%;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(28px, 4.5vw, 64px) 0 clamp(36px, 5vw, 72px);
}

.page-about .about-hero__title {
  margin: 14px 0 clamp(18px, 2.4vw, 26px);
  font-size: clamp(42px, 8.6vw, 108px);
  line-height: 0.95;
  letter-spacing: -0.025em;
  color: var(--white);
}

.page-about .about-hero__lede {
  max-width: 32em;
  margin: 0 0 clamp(26px, 3.4vw, 42px);
  color: var(--gray);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3.2vw, 52px);
  max-width: 62em;
  padding-top: clamp(16px, 2vw, 24px);
  border-top: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-fact__num {
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 700;
  color: var(--lime);
  letter-spacing: 0.02em;
}

.page-about .about-fact__label {
  font-size: 14px;
  color: var(--gray);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(40px, 6vw, 88px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: clamp(12px, 2vw, 22px);
}

.page-about .about-chapter .chapter-no {
  flex: none;
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.page-about .about-chapter .t-h2 {
  margin: 0;
  font-size: clamp(25px, 3.8vw, 42px);
  line-height: 1.22;
  color: var(--white);
}

.page-about .about-band {
  height: var(--about-band-h);
  min-width: 64px;
  margin: clamp(16px, 2.2vw, 22px) 0 clamp(24px, 3.6vw, 46px);
  background: var(--orange);
}

.page-about .about-chapter--1 .about-band { width: 100%; }
.page-about .about-chapter--2 .about-band { width: 82%; }
.page-about .about-chapter--3 .about-band { width: 64%; }
.page-about .about-chapter--4 .about-band { width: 49%; }
.page-about .about-chapter--5 .about-band { width: 36%; }
.page-about .about-chapter--6 .about-band { width: 26%; }

.page-about .about-text {
  max-width: var(--about-text);
}

.page-about .about-text p {
  margin: 0 0 1.15em;
  color: var(--gray);
  line-height: 1.85;
}

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

.page-about .about-text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 227, 197, 0.45);
}

.page-about .about-text a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-text--lede {
  margin: 0 0 clamp(26px, 3.6vw, 44px);
  font-size: clamp(17px, 2vw, 20px);
  color: var(--white);
  line-height: 1.7;
}

.page-about .about-inline-cta {
  margin: clamp(24px, 3vw, 36px) 0 0;
}

.page-about .about-inline-cta a {
  display: inline-block;
  padding: 12px 22px;
  border: 1px solid var(--orange);
  color: var(--orange);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.18s ease, color 0.18s ease;
}

.page-about .about-inline-cta a:hover {
  background: var(--orange);
  color: var(--ink);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(38, 42, 49, 0.55) 0 1px,
    transparent 1px 64px
  );
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(30px, 4.2vw, 52px) clamp(24px, 3.6vw, 44px);
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .about-timeline__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-timeline__item h3 {
  margin: 10px 0 8px;
  font-size: clamp(18px, 2.3vw, 24px);
  color: var(--white);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 36em;
  color: var(--gray);
  line-height: 1.8;
}

/* ---------- 团队分工 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(26px, 3.6vw, 48px);
}

.page-about .about-roles {
  border-top: 1px solid var(--line);
}

.page-about .about-roles details {
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: clamp(16px, 2.2vw, 22px) 0;
  cursor: pointer;
  list-style: none;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  color: var(--white);
}

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

.page-about .about-roles summary .tag {
  margin-left: auto;
}

.page-about .about-roles summary::after {
  content: "＋";
  flex: none;
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 17px;
}

.page-about .about-roles details[open] summary::after {
  content: "－";
}

.page-about .about-roles__body {
  max-width: 40em;
  padding: 0 0 clamp(18px, 2.4vw, 24px);
  color: var(--gray);
  line-height: 1.85;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

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

.page-about .about-figure figcaption {
  padding: 11px 15px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--gray);
}

.page-about .about-figure--wide {
  margin-top: clamp(28px, 4vw, 48px);
  max-width: 62em;
}

.page-about .about-figure--banner {
  margin-top: clamp(28px, 4vw, 48px);
}

/* ---------- 制作流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-flow__step {
  display: grid;
  gap: 7px;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--panel);
}

.page-about .about-flow__time {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.page-about .about-flow__step h3 {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--white);
}

.page-about .about-flow__step p {
  margin: 0;
  color: var(--gray);
  line-height: 1.75;
}

/* ---------- 中段统计带 ---------- */
.page-about .about-statsband {
  padding: clamp(30px, 4.6vw, 56px) 0;
  background: var(--panel);
  border-top: 1px solid var(--orange);
  border-bottom: 1px solid var(--line);
}

.page-about .about-statsband__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-statsband__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.8vw, 46px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--lime);
  line-height: 1.05;
}

.page-about .about-statsband__label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  color: var(--gray);
}

/* ---------- 结尾导航 ---------- */
.page-about .about-next {
  padding: clamp(44px, 6.5vw, 92px) 0 clamp(52px, 7vw, 100px);
  border-top: 1px solid var(--line);
}

.page-about .about-next .t-h2 {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.4vw, 38px);
  color: var(--white);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 38px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-next__card {
  display: block;
  padding: clamp(20px, 3vw, 32px);
  background: var(--ink);
  border-bottom: 3px solid transparent;
  text-decoration: none;
  transition: background 0.18s ease, border-color 0.18s ease;
}

.page-about .about-next__card:hover {
  background: var(--panel);
  border-bottom-color: var(--orange);
}

.page-about .about-next__card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 19px;
  color: var(--white);
}

.page-about .about-next__card span {
  display: block;
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-statsband__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__lede,
  .page-about .about-text {
    max-width: 34em;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card,
  .page-about .about-inline-cta a {
    transition: none;
  }
}