.page-about {
  --about-pad: clamp(18px, 4.5vw, 56px);
  --about-gap: clamp(16px, 2.4vw, 26px);
  --about-line: rgba(11, 61, 145, 0.14);
  --about-line-dark: rgba(0, 229, 255, 0.24);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
  font-family: var(--font-body);
}

.page-about .page-about__crumb {
  padding-top: 18px;
  padding-bottom: 14px;
}

.page-about .breadcrumb__link {
  color: var(--gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb__link:hover {
  color: var(--deep);
  border-color: var(--orange);
}

.page-about .breadcrumb__sep {
  color: var(--steel);
  opacity: 0.6;
}

.page-about .breadcrumb__item span[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(34px, 6vw, 84px) 0 clamp(36px, 5.6vw, 76px);
  margin: 0 0 clamp(10px, 2vw, 20px);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  background:
    radial-gradient(120% 130% at 88% -14%, rgba(0, 229, 255, 0.3), transparent 58%),
    radial-gradient(92% 120% at 4% 112%, rgba(255, 107, 53, 0.24), transparent 62%),
    linear-gradient(152deg, #0b3d91 0%, #061a3a 82%);
  color: var(--white);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: 62%;
  height: 92%;
  background: linear-gradient(120deg, rgba(0, 229, 255, 0.16), rgba(255, 107, 53, 0.05) 62%, transparent);
  transform: rotate(-16deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 3vw, 26px);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.1rem, 7.4vw, 4.9rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(26px, 4vw, 40px);
  max-width: 60ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.85;
  color: rgba(244, 247, 251, 0.86);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(0, 229, 255, 0.22);
  padding-top: 22px;
}

.page-about .about-hero__fact {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(0, 229, 255, 0.14);
}

.page-about .about-hero__fact dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(220, 231, 247, 0.7);
}

.page-about .about-hero__fact dd {
  margin: 6px 0 0;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

/* ---------- 通用章节 ---------- */
.page-about .about-band {
  padding: clamp(44px, 6.4vw, 96px) 0;
}

.page-about .about-band--mission {
  background: linear-gradient(180deg, var(--paper) 0%, #ffffff 68%, var(--paper) 100%);
}

.page-about .about-band--scene {
  background: linear-gradient(180deg, var(--paper) 0%, var(--mist) 46%, var(--paper) 100%);
}

.page-about .about-band--timeline {
  background: linear-gradient(158deg, #0b3d91 0%, #061a3a 88%);
  color: var(--white);
  border-radius: var(--radius-lg);
  margin: 0 clamp(0px, 1.4vw, 20px);
}

.page-about .about-band--team {
  background: var(--paper);
}

.page-about .about-band--impact {
  background: linear-gradient(158deg, #061a3a 0%, #0b3d91 92%);
  color: var(--white);
  border-radius: var(--radius-lg);
  margin: 0 clamp(0px, 1.4vw, 20px);
}

.page-about .about-band--next {
  background: linear-gradient(180deg, var(--mist) 0%, var(--paper) 58%, #ffffff 100%);
}

.page-about .about-num {
  margin: 0 0 10px;
  font-size: clamp(2.9rem, 9vw, 6rem);
  line-height: 0.86;
  font-weight: 200;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(11, 61, 145, 0.3);
}

.page-about .about-num--ink {
  -webkit-text-stroke: 1.5px rgba(59, 111, 212, 0.35);
}

.page-about .about-num--cyan {
  -webkit-text-stroke: 1.5px rgba(0, 229, 255, 0.55);
}

.page-about .about-title {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.1vw, 2.4rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 24ch;
}

.page-about .about-title--dark {
  color: var(--white);
}

.page-about .about-lead {
  margin: 0 0 clamp(24px, 3.6vw, 40px);
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-lead--dark {
  color: rgba(220, 231, 247, 0.76);
}

.page-about .about-band__head {
  margin-bottom: clamp(24px, 3.6vw, 42px);
}

/* ---------- 01 使命 ---------- */
.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: #24374f;
}

.page-about .about-mission__points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-mission__points li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--about-line);
  background: #fff;
  font-size: 14px;
  line-height: 1.7;
  color: #33475f;
}

.page-about .about-mission__points .mono {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--deep);
  font-weight: 700;
}

.page-about .about-mission__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(150deg, #0b3d91, #061a3a);
  box-shadow: var(--shadow-lift);
}

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

.page-about .about-mission__caption {
  padding: 14px 20px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(220, 231, 247, 0.78);
  border-top: 1px solid rgba(0, 229, 255, 0.2);
}

/* ---------- 02 场景 ---------- */
.page-about .about-scene {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-scene__card {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-md);
  background: #ffffff;
  border: 1px solid var(--about-line);
  box-shadow: var(--shadow-soft);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .about-scene__card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.7);
  box-shadow: var(--shadow-lift);
}

.page-about .about-scene__tag {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
  font-weight: 700;
}

.page-about .about-scene__title {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #3c4f66;
}

/* ---------- 03 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 44px);
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.72), rgba(255, 107, 53, 0.5) 62%, rgba(0, 229, 255, 0.1));
  border-radius: var(--pill);
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 14px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.12);
}

.page-about .about-timeline__details {
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(0, 229, 255, 0.2);
  overflow: hidden;
  transition: border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .about-timeline__details[open] {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(0, 229, 255, 0.5);
}

.page-about .about-timeline__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-timeline__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
  transition: transform 0.24s var(--ease);
}

.page-about .about-timeline__details[open] .about-timeline__summary::after {
  content: "−";
}

.page-about .about-timeline__node {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: var(--pill);
  background: rgba(0, 229, 255, 0.14);
  color: var(--cyan);
}

.page-about .about-timeline__label {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(15px, 1.8vw, 18px);
  color: var(--white);
}

.page-about .about-timeline__panel {
  padding: 0 18px 18px;
}

.page-about .about-timeline__panel p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(220, 231, 247, 0.82);
}

.page-about .about-timeline__points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-timeline__points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 247, 251, 0.9);
}

.page-about .about-timeline__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  border-radius: var(--pill);
  background: var(--orange);
}

.page-about .about-timeline__visual {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(0, 229, 255, 0.24);
}

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

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-team__core {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(150deg, var(--mist), #ffffff);
  border: 1px solid var(--about-line);
}

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

.page-about .about-team__cell {
  padding: clamp(18px, 2.6vw, 24px);
  border-radius: var(--radius-md);
  background: #ffffff;
  border: 1px solid var(--about-line);
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease), box-shadow 0.26s var(--ease);
}

.page-about .about-team__cell:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 229, 255, 0.75);
  box-shadow: var(--shadow-soft);
}

.page-about .about-team__kicker {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--steel);
}

.page-about .about-team__title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(16px, 1.9vw, 19px);
  color: var(--ink);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: #3c4f66;
}

/* ---------- 05 成果 ---------- */
.page-about .about-impact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-impact__stat {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(0, 229, 255, 0.26);
}

.page-about .about-impact__num {
  margin: 0 0 8px;
  font-size: clamp(2.6rem, 8vw, 4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-impact__num--word {
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  color: var(--orange);
  font-weight: 700;
}

.page-about .about-impact__label {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(220, 231, 247, 0.82);
}

.page-about .about-impact__stat--case {
  background: rgba(255, 107, 53, 0.1);
  border-color: rgba(255, 107, 53, 0.4);
}

.page-about .about-tagwall {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius-md);
  border: 1px dashed rgba(0, 229, 255, 0.32);
}

.page-about .about-tagwall__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: rgba(220, 231, 247, 0.7);
}

.page-about .about-tagwall__title:not(:first-child) {
  margin-top: 22px;
}

.page-about .about-tagwall__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-chip {
  padding: 7px 15px;
  border-radius: var(--pill);
  font-size: 13px;
  line-height: 1.4;
  color: var(--mist);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.28);
  transition: background 0.22s var(--ease), color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-chip:hover {
  background: rgba(0, 229, 255, 0.18);
  color: var(--white);
  border-color: var(--cyan);
}

.page-about .about-chip--warm {
  border-color: rgba(255, 107, 53, 0.4);
  color: #ffd3c1;
}

.page-about .about-chip--warm:hover {
  background: rgba(255, 107, 53, 0.18);
  color: var(--white);
  border-color: var(--orange);
}

.page-about .about-chip--more {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(220, 231, 247, 0.6);
  border-style: dashed;
}

/* ---------- 06 理念与下一步 ---------- */
.page-about .about-values {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-values__item {
  padding: clamp(20px, 3vw, 26px);
  border-radius: var(--radius-md);
  background: #ffffff;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--orange);
}

.page-about .about-values__num {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--steel);
}

.page-about .about-values__title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(16px, 1.9vw, 19px);
  color: var(--ink);
}

.page-about .about-values__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: #3c4f66;
}

.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: clamp(24px, 4vw, 40px);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(110% 140% at 92% -10%, rgba(0, 229, 255, 0.26), transparent 58%),
    linear-gradient(148deg, #0b3d91, #061a3a);
  color: var(--white);
  box-shadow: var(--shadow-lift);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(18px, 2.6vw, 24px);
  line-height: 1.35;
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(220, 231, 247, 0.86);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.page-about .about-cta__actions .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: var(--pill);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-cta__actions .btn--primary {
  background: var(--orange);
  color: var(--ink);
  border: 1px solid var(--orange);
}

.page-about .about-cta__actions .btn--primary:hover {
  transform: translateY(-2px);
  background: #ff8355;
}

.page-about .about-cta__actions .btn--ghost {
  background: transparent;
  border: 1px solid rgba(0, 229, 255, 0.5);
}

.page-about .about-cta__actions .btn--ghost:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.12);
}

.page-about .about-links {
  list-style: none;
  margin: clamp(24px, 3.6vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-links__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: #ffffff;
  border: 1px solid var(--about-line);
  color: var(--ink);
  font-size: 14.5px;
  text-decoration: none;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-links__item .mono {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .about-links__item:hover {
  transform: translateY(-2px);
  border-color: var(--orange);
  color: var(--deep);
}

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

  .page-about .about-links__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (min-width: 900px) {
  .page-about .about-mission__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-mission__media {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr) minmax(0, 1fr);
    grid-template-areas:
      "a core b"
      "c core d";
    align-items: stretch;
  }

  .page-about .about-team__cell--a { grid-area: a; }
  .page-about .about-team__cell--b { grid-area: b; }
  .page-about .about-team__cell--c { grid-area: c; }
  .page-about .about-team__cell--d { grid-area: d; }

  .page-about .about-team__core {
    grid-area: core;
    align-self: stretch;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .page-about .about-team__core img {
    max-height: 100%;
    object-fit: contain;
  }

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

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }

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

  .page-about .about-timeline__item::before {
    left: -40px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-scene {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__title {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scene__card,
  .page-about .about-team__cell,
  .page-about .about-links__item,
  .page-about .about-cta__actions .btn {
    transition: none;
  }

  .page-about .about-scene__card:hover,
  .page-about .about-team__cell:hover,
  .page-about .about-links__item:hover,
  .page-about .about-cta__actions .btn:hover {
    transform: none;
  }
}