.page-about {
  background: var(--c-cream);
  color: var(--c-ink);
  font-family: var(--font-body);
  overflow: hidden;
}

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

/* 章节头部 */
.page-about .section__head {
  margin-bottom: 12px;
}

.page-about .section__index {
  display: block;
  font-family: var(--font-number);
  font-size: clamp(40px, 7vw, 76px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.page-about .section__label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-orange);
  background: rgba(255, 138, 0, 0.1);
  padding: 5px 10px;
  margin-bottom: 12px;
}

.page-about .section__title {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 6vw, 3.75rem);
  line-height: 1.12;
  margin: 0;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-about .section__intro {
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-gray);
  margin: 14px 0 0;
}

/* 01 品牌宣言 */
.page-about__manifesto {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(57, 255, 136, 0.06) 0%, transparent 48%),
    linear-gradient(135deg, var(--c-space) 0%, var(--c-space-deep) 70%),
    var(--c-space);
  color: var(--c-cream);
  padding: clamp(48px, 8vw, 96px) 0 clamp(72px, 10vw, 120px);
}

.page-about__manifesto::before {
  content: "M6";
  position: absolute;
  right: -0.02em;
  top: -0.18em;
  font-family: var(--font-headline);
  font-size: clamp(160px, 24vw, 320px);
  color: rgba(247, 245, 240, 0.05);
  letter-spacing: -0.08em;
  line-height: 1;
  pointer-events: none;
}

.page-about__manifesto::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: -5%;
  width: 110%;
  height: clamp(24px, 4vw, 48px);
  background: var(--c-cream);
  transform: rotate(2deg) scale(1.15);
  transform-origin: bottom left;
}

.page-about__manifesto .section__index {
  color: var(--c-neon);
}

.page-about__manifesto .section__label {
  color: var(--c-neon);
  background: rgba(57, 255, 136, 0.12);
}

.page-about__manifesto .section__title {
  color: var(--c-cream);
}

.page-about__manifesto .section__intro {
  color: rgba(247, 245, 240, 0.78);
}

.page-about__manifesto-top {
  display: grid;
  gap: 18px;
}

.page-about__manifesto-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
  margin-top: clamp(28px, 6vw, 56px);
}

.page-about__manifesto-media {
  border: 8px solid var(--c-space-variant);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  transform: rotate(-1.5deg);
}

.page-about__manifesto-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__manifesto-copy > p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.84);
}

.page-about__principles {
  display: grid;
  gap: 12px;
  margin: 24px 0 28px;
}

.page-about__principle {
  position: relative;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(57, 255, 136, 0.16);
  border-left: 3px solid var(--c-neon);
  padding: 16px 18px;
}

.page-about__principle::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  border-left: 12px solid transparent;
  border-top: 12px solid var(--c-neon);
}

.page-about__principle-num {
  display: block;
  font-family: var(--font-number);
  font-size: 12px;
  color: var(--c-neon);
  margin-bottom: 6px;
}

.page-about__principle h3 {
  font-family: var(--font-headline);
  font-size: 16px;
  margin: 0 0 6px;
  color: var(--c-cream);
}

.page-about__principle p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 245, 240, 0.76);
}

.page-about__manifesto-copy .btn {
  margin-top: 4px;
}

/* 02 发展历程 */
.page-about__journey {
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about__timeline {
  position: relative;
  margin-top: clamp(24px, 5vw, 56px);
}

.page-about__timeline-item {
  position: relative;
  padding: 0 0 32px 28px;
  border-left: 2px solid rgba(10, 30, 63, 0.18);
}

.page-about__timeline-item:last-child {
  border-left-color: transparent;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-orange);
  border: 3px solid var(--c-cream);
  box-shadow: 0 0 0 1px var(--c-orange);
  z-index: 2;
}

.page-about__timeline-year {
  font-family: var(--font-number);
  font-weight: 700;
  font-size: 1.9rem;
  line-height: 1;
  color: var(--c-orange);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.page-about__timeline-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-space);
  padding: 20px 22px;
  box-shadow: 6px 6px 0 rgba(10, 30, 63, 0.08);
}

.page-about__timeline-card h3 {
  font-family: var(--font-headline);
  font-size: 17px;
  margin: 0 0 8px;
}

.page-about__timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about__timeline-media {
  margin-top: clamp(28px, 6vw, 56px);
  max-width: 980px;
  margin-left: auto;
  margin-right: auto;
  border: 6px solid #fff;
  box-shadow: 12px 12px 0 rgba(10, 30, 63, 0.12);
  transform: rotate(-0.5deg);
}

.page-about__timeline-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 03 团队与能力 */
.page-about__team {
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about__team-grid {
  display: grid;
  gap: 24px;
  margin-top: clamp(24px, 5vw, 48px);
}

.page-about__team-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--c-border);
  padding: 28px 24px;
  box-shadow: 8px 8px 0 rgba(10, 30, 63, 0.08);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.page-about__team-card::after {
  content: "M6";
  position: absolute;
  right: 14px;
  bottom: 8px;
  font-family: var(--font-headline);
  font-size: 30px;
  color: rgba(10, 30, 63, 0.07);
  letter-spacing: -0.06em;
  pointer-events: none;
}

.page-about__team-card .tag {
  margin-bottom: 12px;
}

.page-about__team-card h3 {
  font-family: var(--font-headline);
  font-size: 17px;
  margin: 0 0 8px;
}

.page-about__team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about__team-card ul {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.page-about__team-card li {
  position: relative;
  padding-left: 16px;
  margin-top: 8px;
  font-size: 14px;
  color: var(--c-gray);
}

.page-about__team-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 6px;
  height: 6px;
  background: var(--c-neon);
  transform: rotate(45deg);
}

.page-about__team-card--content li::before {
  background: var(--c-orange);
}

.page-about__team-media {
  margin-top: clamp(28px, 6vw, 48px);
  max-width: 800px;
  border: 6px solid #fff;
  box-shadow: 8px 8px 0 rgba(10, 30, 63, 0.12);
}

.page-about__team-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 04 资质与荣誉 */
.page-about__credentials {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(60% 100% at 90% 0%, rgba(255, 214, 0, 0.06) 0%, transparent 60%),
    var(--c-space);
  color: var(--c-cream);
  padding: clamp(72px, 10vw, 120px) 0;
  clip-path: polygon(0 32px, 100% 0, 100% calc(100% - 32px), 0 100%);
}

.page-about__credentials .section__index {
  color: var(--c-yellow);
}

.page-about__credentials .section__label {
  color: var(--c-yellow);
  background: rgba(255, 214, 0, 0.14);
}

.page-about__credentials .section__title {
  color: var(--c-cream);
}

.page-about__credentials .section__intro {
  color: rgba(247, 245, 240, 0.78);
}

.page-about__cred-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 5vw, 48px);
}

.page-about__cred {
  position: relative;
  background: var(--c-space-variant);
  border: 1px solid rgba(57, 255, 136, 0.2);
  padding: 26px 22px;
}

.page-about__cred::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  background: linear-gradient(90deg, var(--c-neon) 0%, rgba(57, 255, 136, 0) 90%);
}

.page-about__cred-mark {
  display: inline-block;
  font-family: var(--font-number);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--c-neon);
  background: rgba(57, 255, 136, 0.1);
  padding: 5px 10px;
  margin-bottom: 14px;
}

.page-about__cred h3 {
  font-family: var(--font-headline);
  font-size: 17px;
  margin: 0 0 8px;
  color: var(--c-cream);
}

.page-about__cred p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 245, 240, 0.78);
}

.page-about__cred-note {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  margin-top: clamp(24px, 5vw, 40px);
  padding: 18px 22px;
  background: var(--c-space-variant);
  border-left: 4px solid var(--c-orange);
}

.page-about__cred-note p {
  margin: 0;
  font-size: 14px;
  color: rgba(247, 245, 240, 0.85);
  max-width: 56ch;
}

/* 05 合作生态 */
.page-about__partners {
  padding: clamp(56px, 8vw, 96px) 0;
}

.page-about__partners .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.page-about__partners-grid {
  display: grid;
  gap: 20px;
  margin-top: 24px;
}

.page-about__partner {
  background: #fff;
  border: 1px solid var(--c-border);
  border-top: 4px solid var(--c-space);
  padding: 24px 22px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about__partner:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(10, 30, 63, 0.12);
}

.page-about__partner .tag {
  margin-bottom: 12px;
}

.page-about__partner h3 {
  font-family: var(--font-headline);
  font-size: 17px;
  margin: 0 0 8px;
}

.page-about__partner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about__partners-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  margin-top: clamp(24px, 5vw, 48px);
  padding: 22px 24px;
  background: rgba(10, 30, 63, 0.03);
  border: 1px dashed var(--c-border);
}

.page-about__partners-footer p {
  margin: 0;
  font-size: 14px;
  color: var(--c-gray);
  max-width: 42ch;
}

/* 响应式增强 */
@media (min-width: 560px) {
  .page-about__principles {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 760px) {
  .page-about__manifesto-top {
    grid-template-columns: 1.4fr 1fr;
    align-items: end;
    gap: 40px;
  }

  .page-about__manifesto-top .section__intro {
    margin: 0 0 6px;
  }

  .page-about__manifesto-grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
    gap: 48px;
  }

  .page-about__team-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0 32px;
    align-items: start;
  }

  .page-about__team-card--content {
    transform: translateY(24px);
  }

  .page-about__cred-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about__partners-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 860px) {
  .page-about__timeline {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 48px;
  }

  .page-about__timeline::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--c-orange) 0%, var(--c-orange) 12%, var(--c-neon) 92%);
    transform: translateX(-1px);
  }

  .page-about__timeline-item {
    border-left: none;
    padding: 0 48px 40px 0;
  }

  .page-about__timeline-item::before {
    left: auto;
    right: -7px;
  }

  .page-about__timeline-item:nth-child(even) {
    grid-column: 2;
    padding: 0 0 40px 48px;
    transform: translateY(48px);
  }

  .page-about__timeline-item:nth-child(even)::before {
    right: auto;
    left: -7px;
  }
}

@media (min-width: 1100px) {
  .page-about__principles {
    grid-template-columns: repeat(3, 1fr);
  }
}