.page-about {
  --about-max: 1180px;
  --about-edge: clamp(1.15rem, 4.5vw, 3rem);
  --about-grid-line: rgba(53, 240, 196, 0.075);
  position: relative;
  padding-bottom: clamp(2.5rem, 7vw, 4.5rem);
  color: var(--cream);
  background:
    radial-gradient(115% 70% at 84% -4%, rgba(53, 240, 196, 0.15), transparent 60%),
    radial-gradient(85% 55% at 4% 104%, rgba(255, 182, 46, 0.08), transparent 62%),
    linear-gradient(176deg, var(--pitch-deep) 0%, var(--pitch) 44%, var(--night-2) 100%);
  overflow-x: clip;
}

.page-about .container {
  width: min(var(--about-max), 100%);
  margin-inline: auto;
  padding-inline: var(--about-edge);
  box-sizing: border-box;
}

.page-about .kicker {
  color: var(--amber);
  letter-spacing: 0.22em;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(1.4rem, 4vw, 2.4rem);
  padding-bottom: clamp(2.4rem, 6vw, 4rem);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-grid-line) 1px, transparent 1px);
  background-size: 92px 92px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 3rem);
  margin-top: clamp(1.1rem, 3vw, 1.9rem);
}

.page-about .about-title {
  margin: 0.55rem 0 1.1rem;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(2.3rem, 8.6vw, 4.7rem);
  line-height: 0.99;
  letter-spacing: -0.028em;
  text-wrap: balance;
}

.page-about .about-title-line {
  display: block;
}

.page-about .about-title-line--cyan {
  color: var(--cyan);
}

.page-about .about-title-line--cyan::after {
  content: "";
  display: block;
  width: clamp(3rem, 26%, 9.5rem);
  height: 5px;
  margin-top: 0.55rem;
  background: var(--amber);
}

.page-about .about-lede {
  max-width: 46ch;
  color: var(--cream-dim);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.page-about .about-hero-aside {
  position: relative;
}

.page-about .about-hero-media {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--pitch-lit), var(--night-2));
}

.page-about .about-hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .media-caption {
  margin-top: 0.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cream-faint);
}

/* ---------- 节奏条 ---------- */

.page-about .about-ribbon {
  padding-block: clamp(1.1rem, 3vw, 1.65rem);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(90deg, rgba(53, 240, 196, 0.07), transparent 52%, rgba(255, 182, 46, 0.08));
}

.page-about .about-ribbon-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-ribbon-list li {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--cyan);
}

.page-about .about-ribbon-key {
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-ribbon-val {
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--cream-dim);
}

/* ---------- 使命 ---------- */

.page-about .about-mission {
  padding-block: var(--pad-sec);
}

.page-about .about-statement {
  max-width: 60ch;
  margin-bottom: clamp(1.7rem, 4vw, 2.7rem);
}

.page-about .about-statement-text {
  margin: 0.7rem 0 0;
  font-size: clamp(1.28rem, 3.6vw, 2rem);
  font-weight: 600;
  line-height: 1.44;
  letter-spacing: -0.012em;
  color: var(--cream);
}

.page-about .about-statement-text em {
  font-style: normal;
  color: var(--cyan);
  background: linear-gradient(transparent 64%, rgba(53, 240, 196, 0.16) 64%);
}

.page-about .about-mission-grid {
  gap: clamp(1rem, 3vw, 1.75rem);
}

.page-about .about-panel {
  position: relative;
  padding: clamp(1.3rem, 3.4vw, 1.95rem);
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  border-radius: 0;
  background: linear-gradient(165deg, rgba(10, 35, 24, 0.86), rgba(8, 11, 24, 0.7));
}

.page-about .about-panel.panel--amber {
  border-top-color: var(--amber);
}

.page-about .about-panel-index {
  margin: 0 0 0.55rem;
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--cream-faint);
}

.page-about .about-panel p {
  margin: 0.55rem 0 0;
  color: var(--cream-dim);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* ---------- 愿景 ---------- */

.page-about .about-vision {
  position: relative;
  padding-block: var(--pad-sec);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(19, 26, 58, 0.6), rgba(4, 20, 13, 0.25) 72%, transparent);
}

.page-about .about-vision-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.6rem);
  align-items: center;
}

.page-about .about-vision-copy h2 {
  margin: 0.5rem 0 1rem;
  font-size: clamp(1.55rem, 4.4vw, 2.5rem);
  line-height: 1.17;
  letter-spacing: -0.018em;
}

.page-about .about-vision-copy p {
  color: var(--cream-dim);
  line-height: 1.72;
  font-size: 0.96rem;
}

.page-about .about-vision-copy p + p {
  margin-top: 0.85rem;
}

.page-about .about-vision-media {
  aspect-ratio: 2 / 1;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--pitch-lit), var(--night-2));
}

.page-about .about-vision-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 服务对象 ---------- */

.page-about .about-serve {
  padding-block: var(--pad-sec);
}

.page-about .about-serve-head h2 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.5rem, 4.2vw, 2.3rem);
  line-height: 1.18;
  letter-spacing: -0.018em;
}

.page-about .about-serve-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(0.9rem, 2.8vw, 1.4rem);
  margin: clamp(1.4rem, 4vw, 2.2rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-serve-item {
  position: relative;
  padding: clamp(1.25rem, 3.4vw, 1.85rem) clamp(1.1rem, 3vw, 1.65rem);
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(15, 51, 34, 0.72), rgba(8, 11, 24, 0.5));
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-serve-item::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.38s var(--ease);
}

.page-about .about-serve-item:hover,
.page-about .about-serve-item:focus-within {
  border-color: var(--line);
}

.page-about .about-serve-item:hover::after,
.page-about .about-serve-item:focus-within::after {
  transform: scaleX(1);
}

.page-about .about-serve-num {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  color: var(--amber);
}

.page-about .about-serve-item h3 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.06rem, 2.6vw, 1.28rem);
  letter-spacing: -0.01em;
}

.page-about .about-serve-item p {
  margin: 0;
  color: var(--cream-dim);
  font-size: 0.94rem;
  line-height: 1.68;
}

/* ---------- 四条坚持 ---------- */

.page-about .about-field {
  padding-block: var(--pad-sec);
}

.page-about .about-field-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 3rem);
  align-items: center;
}

.page-about .about-field-media {
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--pitch-lit), var(--night-2));
}

.page-about .about-field-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-field-copy h2 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.45rem, 4vw, 2.15rem);
  line-height: 1.2;
  letter-spacing: -0.018em;
}

.page-about .about-rules {
  display: grid;
  gap: 0.85rem;
  margin: 1.15rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rules li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--cream-dim);
  font-size: 0.94rem;
  line-height: 1.68;
}

.page-about .about-rules li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-rules strong {
  color: var(--cream);
  font-weight: 700;
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  padding-block: clamp(2rem, 5vw, 3.4rem);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-next-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .about-next-lead h2 {
  max-width: 34ch;
  margin: 0.5rem 0 0;
  font-size: clamp(1.28rem, 3.4vw, 1.85rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.page-about .about-next-links {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 0.15rem;
  border-bottom: 1px solid var(--line-soft);
  color: var(--cream);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.page-about .about-next-link span {
  color: var(--cyan);
  transition: transform 0.25s var(--ease);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  color: var(--cyan);
  padding-left: 0.6rem;
}

.page-about .about-next-link:hover span,
.page-about .about-next-link:focus-visible span {
  transform: translateX(4px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-ribbon-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-next-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
    gap: 2.5rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-vision-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.16fr);
  }

  .page-about .about-field-grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }
}

@media (min-width: 1040px) {
  .page-about .about-ribbon-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}