.page-about {
  --about-aside-width: 168px;
  background: var(--primary-space-blue);
  color: var(--pure-white);
  overflow-x: clip;
  font-family: var(--font-body);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-headline);
}

.page-about h2 {
  font-size: clamp(1.8rem, 3.6vw, 2.8rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 8px 0 20px;
}

.page-about h3 {
  font-size: clamp(1.125rem, 1.8vw, 1.375rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 8px;
}

.page-about .about-lead {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--galaxy-mist);
  max-width: 52em;
  margin: 0 0 32px;
}

/* ---------- 品牌故事区 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(56px, 9vh, 110px);
  padding-bottom: clamp(64px, 10vh, 128px);
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 66%;
  background: var(--ink-blue);
  clip-path: polygon(22% 0, 100% 0, 100% 100%, 0 84%);
  z-index: 0;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.page-about .about-hero-copy {
  max-width: 680px;
}

.page-about .about-hero h1 {
  font-size: clamp(2.25rem, 5vw, 4.1rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 20px 0 24px;
}

.page-about .about-hero-desc {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--galaxy-mist);
  max-width: 44em;
}

.page-about .about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-track {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 36px;
}

.page-about .about-hero-track-bar {
  width: min(220px, 42vw);
  height: 2px;
  background: linear-gradient(90deg, var(--volt-yellow), var(--accent-orange));
  transform: skewX(-24deg);
}

.page-about .about-hero-track-chip {
  width: 10px;
  height: 10px;
  background: var(--volt-yellow);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(255, 212, 0, 0.15);
}

.page-about .about-hero-figure {
  margin: 0;
  position: relative;
  filter: drop-shadow(0 32px 44px rgba(0, 0, 0, 0.42));
}

.page-about .about-hero-figure::before {
  content: '';
  position: absolute;
  inset: 10px -10px -10px 10px;
  border: 2px solid var(--signal-cyan);
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  opacity: 0.55;
  z-index: 0;
}

.page-about .about-hero-figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 5%, 100% 95%, 0 100%);
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-milestone {
  position: relative;
  padding: clamp(72px, 10vw, 132px) 0;
  background: linear-gradient(180deg, var(--primary-space-blue) 0%, var(--ink-blue) 120%);
}

.page-about .about-milestone-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px 48px;
}

.page-about .about-aside {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
}

.page-about .about-aside-index {
  font-family: var(--font-headline);
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  font-weight: 900;
  line-height: 1;
  color: var(--volt-yellow);
}

.page-about .about-aside-line {
  display: block;
  width: 72px;
  height: 2px;
  background: linear-gradient(90deg, var(--volt-yellow), var(--accent-orange));
}

.page-about .about-aside-dir {
  font-family: var(--font-headline);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--galaxy-mist);
  text-transform: uppercase;
}

.page-about .about-milestone-banner {
  margin: 0 0 48px;
  position: relative;
}

.page-about .about-milestone-banner::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 42%;
  background: linear-gradient(180deg, transparent, var(--primary-space-blue));
  pointer-events: none;
  z-index: 1;
}

.page-about .about-milestone-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 76%, 0 100%);
}

.page-about .about-timeline {
  position: relative;
  padding-left: 36px;
  margin-bottom: 40px;
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 10px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--volt-yellow) 0%, var(--accent-orange) 60%, rgba(255, 106, 0, 0.25) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.page-about .about-timeline-item::before {
  content: '';
  position: absolute;
  left: -36px;
  top: 26px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--primary-space-blue);
  border: 3px solid var(--volt-yellow);
  box-shadow: 0 0 0 5px rgba(255, 212, 0, 0.16);
}

.page-about .about-timeline-year {
  font-family: var(--font-headline);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  font-weight: 900;
  line-height: 1;
  color: var(--accent-orange);
  margin-bottom: 10px;
}

.page-about .about-timeline-body {
  padding: 24px 26px;
  background: rgba(26, 35, 64, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

@media (hover: hover) {
  .page-about .about-timeline-item:hover .about-timeline-body {
    transform: translateX(8px);
    border-color: rgba(255, 106, 0, 0.45);
  }
}

.page-about .about-milestone-caption {
  padding: 20px 24px;
  background: linear-gradient(90deg, rgba(255, 106, 0, 0.16), rgba(255, 212, 0, 0.05));
  border-left: 4px solid var(--volt-yellow);
  color: var(--galaxy-mist);
}

/* ---------- 第8版评测体系 ---------- */
.page-about .about-evaluation {
  position: relative;
  padding: clamp(72px, 10vw, 132px) 0;
  background: var(--primary-space-blue);
  overflow: hidden;
}

.page-about .about-evaluation::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 38%;
  height: 100%;
  background: linear-gradient(135deg, rgba(26, 35, 64, 0.5), transparent 72%);
  pointer-events: none;
}

.page-about .about-evaluation-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.page-about .about-evaluation-figure {
  margin: 0;
  position: relative;
}

.page-about .about-evaluation-figure::after {
  content: '8';
  position: absolute;
  right: 8px;
  bottom: 30px;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(5.5rem, 14vw, 11rem);
  line-height: 0.8;
  color: var(--accent-orange);
  opacity: 0.6;
  pointer-events: none;
  z-index: 1;
}

.page-about .about-evaluation-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 14% 100%);
}

.page-about .about-evaluation-copy {
  max-width: 640px;
}

.page-about .about-evaluation-list {
  margin-top: 24px;
  border-top: 2px solid rgba(255, 255, 255, 0.08);
}

.page-about .about-evaluation-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: padding-left 0.3s ease, background 0.3s ease;
}

.page-about .about-evaluation-no {
  font-family: var(--font-headline);
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--volt-yellow);
  line-height: 1.4;
}

.page-about .about-evaluation-item h3 {
  color: var(--pure-white);
}

.page-about .about-evaluation-item p {
  margin: 0;
  color: var(--galaxy-mist);
  font-size: 0.9375rem;
}

@media (hover: hover) {
  .page-about .about-evaluation-item:hover {
    background: rgba(255, 106, 0, 0.06);
    padding-left: 12px;
  }
}

/* ---------- 内容团队与支持 ---------- */
.page-about .about-support {
  background: var(--galaxy-mist);
  color: var(--charcoal);
  padding: clamp(72px, 10vw, 128px) 0;
}

.page-about .about-support h2 {
  color: var(--ink-blue);
}

.page-about .about-support .about-lead {
  color: var(--charcoal);
}

.page-about .about-support .eyebrow {
  color: var(--accent-orange);
}

.page-about .about-support-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: start;
}

.page-about .about-support-copy > p {
  color: var(--charcoal);
}

.page-about .about-support-copy a:not(.btn) {
  color: var(--ink-blue);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: rgba(26, 35, 64, 0.35);
}

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

.page-about .about-contact-list div {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 8px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(46, 52, 64, 0.14);
}

.page-about .about-contact-list dt {
  font-weight: 700;
  color: var(--ink-blue);
}

.page-about .about-contact-list dd {
  margin: 0;
  word-break: break-word;
  color: var(--charcoal);
}

.page-about .about-support-note {
  font-size: 0.9375rem;
}

.page-about .about-support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-support .btn-outline {
  border-color: var(--ink-blue);
  color: var(--ink-blue);
}

.page-about .about-support .btn-primary {
  background: var(--ink-blue);
  border-color: var(--ink-blue);
  color: var(--pure-white);
}

.page-about .about-support-process {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-support-step {
  padding: 28px 30px;
  background: var(--ink-blue);
  color: var(--pure-white);
  position: relative;
}

.page-about .about-support-step-no {
  display: block;
  font-family: var(--font-headline);
  font-size: 1.6rem;
  font-weight: 900;
  line-height: 1;
  color: var(--volt-yellow);
  margin-bottom: 12px;
}

.page-about .about-support-step h3 {
  color: var(--pure-white);
}

.page-about .about-support-step p {
  margin: 0;
  color: var(--galaxy-mist);
  font-size: 0.9375rem;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 981px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(48px, 7vw, 110px);
  }

  .page-about .about-milestone-layout {
    grid-template-columns: var(--about-aside-width) 1fr;
    gap: clamp(48px, 6vw, 100px);
  }

  .page-about .about-aside {
    position: sticky;
    top: calc(var(--header-height) + 28px);
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 0;
  }

  .page-about .about-aside-line {
    width: 2px;
    height: clamp(80px, 16vh, 140px);
    background: linear-gradient(180deg, var(--volt-yellow), var(--accent-orange));
  }

  .page-about .about-aside-dir {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
  }

  .page-about .about-evaluation-layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(48px, 7vw, 110px);
  }

  .page-about .about-support-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(48px, 7vw, 110px);
  }
}