.page-about {
  --about-rule: 2px solid var(--ink);
  --about-rule-dark: 2px solid rgba(159, 180, 214, 0.28);
}

/* ---------- 页首观测区 ---------- */
.page-about .about-masthead {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--star);
  color: var(--cream);
  padding: clamp(28px, 5vw, 48px) 0 clamp(44px, 6vw, 80px);
}

.page-about .about-masthead__visual {
  position: absolute;
  inset: 0;
  z-index: -1;
  margin: 0;
}

.page-about .about-masthead__visual img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.4;
}

.page-about .about-masthead__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(115% 95% at 8% 0%, rgba(10, 18, 48, 0.5), rgba(10, 18, 48, 0.97) 74%),
    linear-gradient(180deg, rgba(10, 18, 48, 0.3), rgba(10, 18, 48, 0.94));
}

.page-about .about-masthead__inner {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-masthead__lead {
  min-width: 0;
}

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

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(159, 180, 214, 0.5);
}

.page-about .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 232, 208, 0.35);
  transition: border-color var(--dur) var(--ease);
}

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

.page-about .about-masthead__annot {
  display: block;
  margin: 0 0 16px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-masthead h1 {
  margin: 0 0 22px;
  max-width: 20ch;
}

.page-about .about-masthead__lede {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(244, 234, 215, 0.84);
}

.page-about .about-masthead__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: rgba(159, 180, 214, 0.24);
  border: 1px solid rgba(159, 180, 214, 0.24);
}

.page-about .about-masthead__facts > div {
  background: rgba(10, 18, 48, 0.7);
  padding: 14px 16px;
}

.page-about .about-masthead__facts dt {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-masthead__facts dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(52px, 7vw, 96px) 0;
}

.page-about .about-chapter--cream {
  background: var(--cream);
  color: var(--ink);
}

.page-about .about-chapter--deep {
  background: var(--star);
  color: var(--cream);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.page-about .about-chapter__body {
  min-width: 0;
  max-width: 760px;
}

.page-about .chapter-num {
  font-family: var(--font-num);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--signal);
}

.page-about .annot--vertical {
  writing-mode: horizontal-tb;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold-line);
}

.page-about .about-chapter--deep .annot--vertical {
  color: var(--mist);
}

.page-about .about-chapter__body h2 {
  margin: 0 0 20px;
  max-width: 16ch;
}

.page-about .about-lead {
  margin: 0 0 34px;
  max-width: 40ch;
  font-size: 17px;
  line-height: 1.8;
}

.page-about .about-chapter--cream .about-lead {
  color: rgba(42, 33, 24, 0.86);
}

.page-about .about-chapter--deep .about-lead {
  color: rgba(244, 234, 215, 0.84);
}

.page-about .about-chapter__figure {
  margin: 36px 0 0;
}

.page-about .about-chapter__figure .media-frame__slot {
  display: block;
  overflow: hidden;
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--star-deep);
}

.page-about .about-chapter--deep .about-chapter__figure .media-frame__slot {
  border-color: rgba(59, 232, 208, 0.4);
  box-shadow: var(--shadow-glow);
}

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

.page-about .media-frame__caption {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gold-line);
}

.page-about .about-chapter--deep .media-frame__caption {
  color: var(--mist);
}

/* ---------- 01 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 32px;
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-ring {
  display: block;
  width: 100%;
  max-width: 320px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-ring__base {
  fill: none;
  stroke: rgba(122, 90, 40, 0.28);
  stroke-width: 2;
}

.page-about .about-ring__arc {
  fill: none;
  stroke-width: 14;
  stroke-linecap: butt;
  stroke-dasharray: 176 578;
  opacity: 0.55;
  transition: opacity var(--dur) var(--ease), stroke-width var(--dur) var(--ease);
}

.page-about .about-ring__arc--edit {
  stroke: #1F9C8C;
  stroke-dashoffset: 0;
}

.page-about .about-ring__arc--observe {
  stroke: var(--signal);
  stroke-dashoffset: -188.5;
}

.page-about .about-ring__arc--tool {
  stroke: var(--gold-line);
  stroke-dashoffset: -377;
}

.page-about .about-ring__arc--care {
  stroke: #6FA8C9;
  stroke-dashoffset: -565.5;
}

.page-about .about-ring__core {
  font-family: var(--font-num);
  font-size: 46px;
  font-weight: 700;
  fill: var(--ink);
}

.page-about .about-ring__core-label {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.12em;
  fill: rgba(42, 33, 24, 0.62);
}

.page-about .about-team__figure figcaption {
  margin: 18px auto 0;
  max-width: 320px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(42, 33, 24, 0.68);
}

.page-about .about-team__list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__item {
  border: 2px solid var(--ink);
  border-left-width: 6px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.34);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-team__item--edit {
  border-left-color: #1F9C8C;
}

.page-about .about-team__item--observe {
  border-left-color: var(--signal);
}

.page-about .about-team__item--tool {
  border-left-color: var(--gold-line);
}

.page-about .about-team__item--care {
  border-left-color: #6FA8C9;
}

.page-about .about-team__item:hover {
  transform: translate(-2px, -2px);
  background: var(--glow);
  box-shadow: var(--shadow-hard);
}

.page-about .about-team__role {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(42, 33, 24, 0.78);
}

.page-about .about-team:has(.about-team__item--edit:hover) .about-ring__arc--edit,
.page-about .about-team:has(.about-team__item--observe:hover) .about-ring__arc--observe,
.page-about .about-team:has(.about-team__item--tool:hover) .about-ring__arc--tool,
.page-about .about-team:has(.about-team__item--care:hover) .about-ring__arc--care {
  opacity: 1;
  stroke-width: 18;
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 32px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--amber) 46%, var(--signal) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px;
}

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

.page-about .about-timeline__dot {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(10, 18, 48, 1), 0 0 0 5px rgba(226, 87, 30, 0.5);
}

.page-about .about-timeline__item--now .about-timeline__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(10, 18, 48, 1), 0 0 0 5px rgba(59, 232, 208, 0.6);
}

.page-about .about-timeline__when {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  color: var(--cream);
}

.page-about .about-timeline__desc {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 234, 215, 0.78);
}

/* ---------- 03 比赛日节奏 ---------- */
.page-about .about-rhythm {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--ink);
}

.page-about .about-rhythm__item {
  display: grid;
  gap: 10px 28px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(122, 90, 40, 0.35);
}

.page-about .about-rhythm__num {
  font-family: var(--font-num);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--signal);
}

.page-about .about-rhythm__body {
  min-width: 0;
}

.page-about .about-rhythm__label {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-rhythm__note {
  margin: 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(42, 33, 24, 0.76);
}

/* ---------- 04 数据来源 ---------- */
.page-about .about-source {
  display: grid;
  gap: 16px;
}

.page-about .about-source__item {
  border: var(--about-rule-dark);
  border-left: 4px solid var(--cyan);
  background: var(--star-deep);
  padding: 20px 22px;
  transition: border-left-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-source__item:hover {
  border-left-color: var(--amber);
  transform: translateX(3px);
}

.page-about .about-source__k {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-source__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 234, 215, 0.82);
}

/* ---------- 05 山东本地 ---------- */
.page-about .about-local {
  display: grid;
  gap: 28px;
}

.page-about .about-local__label {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .about-local__title {
  margin: 0 0 16px;
}

.page-about .about-local__text {
  margin: 0 0 14px;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(42, 33, 24, 0.8);
}

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

.page-about .about-local__meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: rgba(122, 90, 40, 0.3);
  border: 2px solid var(--ink);
}

.page-about .about-local__meta > div {
  background: var(--cream);
  padding: 16px;
}

.page-about .about-local__meta dt {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(42, 33, 24, 0.6);
}

.page-about .about-local__meta dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .about-local__meta .num-lg {
  font-family: var(--font-num);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

/* ---------- 06 内容迭代 ---------- */
.page-about .about-loop {
  display: grid;
  gap: 30px;
}

.page-about .about-loop__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
  counter-reset: loop;
}

.page-about .about-loop__step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  border-top: 2px solid rgba(159, 180, 214, 0.28);
  padding-top: 16px;
}

.page-about .about-loop__idx {
  font-family: var(--font-num);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--signal);
}

.page-about .about-loop__text {
  margin: 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 234, 215, 0.82);
}

.page-about .about-loop__aside {
  border: 2px solid var(--amber);
  background: rgba(240, 166, 60, 0.12);
  padding: 22px;
}

.page-about .about-loop__aside-label {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-loop__aside-num {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .about-loop__aside-text {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 234, 215, 0.8);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  background: var(--amber);
  color: var(--ink);
  border-top: 2px solid var(--ink);
  padding: clamp(44px, 6vw, 76px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  gap: 28px;
}

.page-about .about-cta__eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: rgba(42, 33, 24, 0.7);
}

.page-about .about-cta__text h2 {
  margin: 0 0 16px;
  max-width: 18ch;
}

.page-about .about-cta__copy {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(42, 33, 24, 0.86);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .about-cta__link {
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(42, 33, 24, 0.5);
  padding-bottom: 2px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-cta__link:hover {
  color: var(--star);
  border-bottom-color: var(--star);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-rhythm__item {
    grid-template-columns: minmax(0, 150px) minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-start;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
}

@media (min-width: 820px) {
  .page-about .about-chapter__grid {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    align-self: start;
    position: sticky;
    top: 128px;
  }

  .page-about .annot--vertical {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    padding-top: 4px;
  }

  .page-about .about-timeline {
    padding-left: 44px;
  }

  .page-about .about-timeline__dot {
    left: -44px;
  }

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

  .page-about .about-loop {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
    gap: 44px;
  }
}

@media (min-width: 960px) {
  .page-about .about-masthead__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    align-items: start;
    gap: 48px;
  }

  .page-about .about-local {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
    gap: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__item,
  .page-about .about-ring__arc,
  .page-about .about-source__item,
  .page-about .about-cta__link,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .about-team__item:hover,
  .page-about .about-source__item:hover {
    transform: none;
  }
}