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

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about .page-about__timeline-dot:focus-visible {
  outline: 3px solid var(--color-red);
  outline-offset: 3px;
}

.page-about .kicker {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: .22em;
  color: var(--color-red);
  margin: 0 0 10px;
}

.page-about__hl {
  background: linear-gradient(120deg, rgba(200, 240, 0, .3), rgba(200, 240, 0, .12));
  color: var(--color-blue);
  font-weight: 700;
  padding: 0 5px;
  border-radius: 4px;
  white-space: nowrap;
}

/* ===== 首屏 HERO ===== */
.page-about__hero {
  position: relative;
  background: var(--color-cream);
  padding: 26px 0 56px;
  overflow: hidden;
  border-bottom: 1px solid rgba(26, 22, 18, .08);
}

.page-about__hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(0deg, rgba(10, 37, 64, .025) 0 1px, transparent 1px 5px);
  pointer-events: none;
}

.page-about__hero-ghost {
  position: absolute;
  top: 32px;
  right: -12px;
  font-family: var(--font-display);
  font-size: clamp(62px, 16vw, 190px);
  line-height: 1;
  letter-spacing: .02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(162, 184, 204, .4);
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.page-about__hero-inner {
  position: relative;
  z-index: 1;
}

.page-about__hero-grid {
  display: grid;
  gap: 34px;
  margin-top: 40px;
}

.page-about__hero-title {
  font-size: clamp(42px, 8vw, 84px);
  line-height: 1.04;
  letter-spacing: .01em;
  margin: 14px 0 22px;
  position: relative;
}

.page-about__hero-title::after {
  content: "";
  display: block;
  width: 76px;
  height: 9px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--color-red) 0 62%, var(--color-gold) 62% 100%);
  transform: skew(-24deg);
  border-radius: 2px;
}

.page-about__brand-slice {
  display: inline-block;
  background: var(--color-red);
  color: var(--color-cream);
  padding: 0 .15em;
  transform: skew(-6deg);
  border-radius: 4px;
  box-shadow: 6px 4px 0 rgba(10, 37, 64, .14);
}

.page-about__hero-lead {
  max-width: 640px;
  font-size: 17px;
  line-height: 1.9;
  color: rgba(26, 22, 18, .78);
}

.page-about__hero-tags {
  margin-top: 22px;
}

.page-about__hero-index {
  background: var(--color-warm);
  border: 1px solid rgba(26, 22, 18, .08);
  border-left: 4px solid var(--color-red);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow-card);
}

.page-about__index-label {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--color-blue);
  margin: 0 0 10px;
}

.page-about__index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about__index-list li {
  border-bottom: 1px dashed rgba(26, 22, 18, .12);
}

.page-about__index-list li:last-child {
  border-bottom: 0;
}

.page-about__index-list a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 2px;
  color: var(--color-brown);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: padding-left .2s ease, color .2s ease;
}

.page-about__index-list a:hover {
  padding-left: 8px;
  color: var(--color-red);
}

.page-about__index-num {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--color-gold);
  width: 26px;
  text-align: right;
}

/* ===== 通用标题区 ===== */
.page-about__section-head {
  max-width: 720px;
  margin-bottom: 44px;
}

.page-about__section-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.8vw, 54px);
  line-height: 1.08;
  margin: 10px 0 16px;
  position: relative;
  color: var(--color-brown);
}

.page-about__section-title::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 14px;
  margin-right: 10px;
  background: var(--color-red);
  transform: skew(-12deg);
  border-radius: 2px;
  vertical-align: .16em;
}

.page-about__ghost-index {
  position: absolute;
  right: 0;
  top: -0.38em;
  font-family: var(--font-display);
  font-size: 2.3em;
  line-height: 1;
  color: rgba(10, 37, 64, .06);
  z-index: 0;
  pointer-events: none;
  user-select: none;
}

.page-about__section-lead {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(26, 22, 18, .72);
}

/* ===== 品牌宣言 ===== */
.page-about__manifesto {
  padding-top: 76px;
  padding-bottom: 84px;
}

.page-about__manifesto-grid {
  display: grid;
  gap: 36px;
}

.page-about__manifesto-main .page-about__manifesto-lead {
  font-size: 18px;
  line-height: 1.95;
  color: rgba(26, 22, 18, .82);
  max-width: 660px;
  margin-top: 22px;
}

.page-about__manifesto-points {
  margin-top: 42px;
  display: grid;
  gap: 22px;
}

.page-about__manifesto-point {
  display: grid;
  gap: 9px;
  border-top: 2px solid var(--color-brown);
  padding-top: 16px;
  transition: transform .22s ease;
}

.page-about__manifesto-point:hover {
  transform: translateX(4px);
}

.page-about__manifesto-num {
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1;
  color: var(--color-red);
  transition: color .22s ease;
}

.page-about__manifesto-point:hover .page-about__manifesto-num {
  color: var(--color-gold);
}

.page-about__manifesto-point p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(26, 22, 18, .74);
}

.page-about__manifesto-point strong {
  display: block;
  color: var(--color-brown);
  font-size: 15px;
  margin-bottom: 2px;
}

.page-about__manifesto-panel {
  position: relative;
  padding: 28px 26px;
  border-radius: var(--radius);
  border: 1px solid rgba(26, 22, 18, .08);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  align-self: start;
}

.page-about__manifesto-panel::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, transparent 45%, rgba(229, 72, 19, .95) 46%, rgba(229, 72, 19, .95) 52%, transparent 53%);
  opacity: .16;
}

.page-about__panel-kicker {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: .18em;
  color: var(--color-red);
  margin: 0 0 18px;
}

.page-about__panel-list {
  margin: 0 0 22px;
  display: grid;
}

.page-about__panel-row {
  padding: 15px 0;
  border-bottom: 1px dashed rgba(26, 22, 18, .14);
}

.page-about__panel-row:last-child {
  border-bottom: 0;
}

.page-about__panel-row dt {
  font-size: 12px;
  letter-spacing: .14em;
  color: rgba(26, 22, 18, .55);
  margin-bottom: 4px;
}

.page-about__panel-row dd {
  margin: 0;
  font-weight: 700;
  color: var(--color-brown);
  font-size: 15px;
  line-height: 1.6;
}

.page-about__panel-btn {
  width: 100%;
  justify-content: center;
}

/* ===== 三大支柱 ===== */
.page-about__pillars {
  background: var(--color-warm);
  border-top: 1px solid rgba(26, 22, 18, .05);
  border-bottom: 1px solid rgba(26, 22, 18, .05);
  padding-top: 82px;
  padding-bottom: 80px;
}

.page-about__pillars-grid {
  display: grid;
  gap: 28px;
  margin-top: 12px;
}

.page-about__pillar-card {
  background: var(--color-cream);
  border: 1px solid rgba(26, 22, 18, .09);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: transform .25s ease, box-shadow .25s ease;
}

.page-about__pillar-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
}

.page-about__pillar-card summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  display: grid;
  gap: 8px;
  padding: 30px 26px 24px;
}

.page-about__pillar-card summary::-webkit-details-marker {
  display: none;
}

.page-about__pillar-tab {
  position: absolute;
  left: -9px;
  top: 30px;
  z-index: 1;
}

.page-about__pillar-tab .tag {
  transform: skew(-6deg);
  box-shadow: 2px 2px 0 rgba(26, 22, 18, .14);
}

.page-about__pillar-title {
  font-family: var(--font-display);
  font-size: 27px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-brown);
}

.page-about__pillar-meta {
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(26, 22, 18, .52);
}

.page-about__pillar-toggle {
  position: absolute;
  right: 18px;
  top: 20px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid rgba(26, 22, 18, .16);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform .25s ease, background .25s ease, border-color .25s ease;
}

.page-about__pillar-toggle::before {
  content: "+";
  font-size: 18px;
  line-height: 1;
  color: var(--color-red);
}

.page-about__pillar-card[open] .page-about__pillar-toggle {
  transform: rotate(45deg);
  background: var(--color-red);
  border-color: var(--color-red);
}

.page-about__pillar-card[open] .page-about__pillar-toggle::before {
  color: #fff;
}

.page-about__pillar-body {
  padding: 4px 26px 26px;
  border-top: 1px dashed rgba(26, 22, 18, .12);
}

.page-about__pillar-body > p {
  margin: 16px 0 13px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(26, 22, 18, .78);
}

.page-about__pillar-list {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about__pillar-list li {
  position: relative;
  padding-left: 19px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(26, 22, 18, .82);
}

.page-about__pillar-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .58em;
  width: 8px;
  height: 8px;
  background: var(--color-neon);
  border-radius: 2px;
  transform: skew(-12deg);
}

.page-about__pillar-body .tag-list {
  margin-top: 4px;
}

.page-about__pillars-figure {
  margin: 48px auto 0;
  max-width: 720px;
}

.page-about__pillars-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ===== 发展历程 ===== */
.page-about__timeline-section {
  background: var(--color-cream);
  padding: 0 0 96px;
  position: relative;
}

.page-about__timeline-banner {
  margin: 0;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border-bottom: 3px solid rgba(201, 169, 98, .55);
}

.page-about__timeline-banner img {
  display: block;
  width: 100%;
  height: 170px;
  object-fit: cover;
  filter: sepia(.14) saturate(.75);
}

.page-about__timeline-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(245, 239, 224, .88) 0%, rgba(245, 239, 224, .3) 42%, rgba(245, 239, 224, .04) 100%);
  z-index: 1;
  pointer-events: none;
}

.page-about__timeline-caption {
  position: absolute;
  left: 20px;
  bottom: 16px;
  z-index: 2;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--color-brown);
  background: rgba(245, 239, 224, .86);
  border: 1px solid rgba(201, 169, 98, .55);
  padding: 6px 14px;
  border-radius: 999px;
  backdrop-filter: blur(4px);
}

.page-about__timeline-content {
  padding-top: 70px;
}

.page-about__section-head--line {
  padding-left: 20px;
  border-left: 3px solid var(--color-gold);
}

.page-about__timeline-track {
  position: relative;
  margin-top: 36px;
}

.page-about__timeline-svg {
  position: absolute;
  left: 31px;
  top: 26px;
  bottom: 26px;
  width: 2px;
  height: auto;
  z-index: 0;
  overflow: visible;
}

.page-about__timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 32px;
  position: relative;
  z-index: 1;
}

.page-about__timeline-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  column-gap: 18px;
  align-items: center;
}

.page-about__timeline-dot {
  width: 52px;
  height: 52px;
  justify-self: center;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-blue);
  color: var(--color-cream);
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  box-shadow: 0 0 0 6px rgba(201, 169, 98, .24);
  z-index: 2;
  transition: transform .2s ease, box-shadow .2s ease;
}

.page-about__timeline-item:hover .page-about__timeline-dot,
.page-about__timeline-item:focus-within .page-about__timeline-dot {
  transform: scale(1.1) rotate(-6deg);
  box-shadow: 0 0 0 10px rgba(201, 169, 98, .22);
}

.page-about__timeline-dot-label {
  position: absolute;
  left: calc(100% + 16px);
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--color-blue);
  background: var(--color-cream);
  border: 1px solid var(--color-gold);
  padding: 6px 13px;
  border-radius: 999px;
  box-shadow: var(--shadow-card);
  opacity: 0;
  pointer-events: none;
  z-index: 5;
  transition: opacity .2s ease, transform .2s ease;
}

.page-about__timeline-item:hover .page-about__timeline-dot-label,
.page-about__timeline-item:focus-within .page-about__timeline-dot-label {
  opacity: 1;
  transform: translateY(-50%) translateX(2px);
}

.page-about__timeline-card {
  padding: 22px 24px;
  border: 1px solid rgba(26, 22, 18, .07);
  border-left: 3px solid var(--color-gold);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: transform .25s ease, box-shadow .25s ease;
}

.page-about__timeline-item:hover .page-about__timeline-card,
.page-about__timeline-item:focus-within .page-about__timeline-card {
  transform: translateY(-3px);
  box-shadow: var(--shadow-float);
}

.page-about__timeline-card h3 {
  font-family: var(--font-display);
  font-size: 21px;
  line-height: 1.2;
  margin: 0 0 8px;
  color: var(--color-blue);
}

.page-about__timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(26, 22, 18, .76);
}

/* ===== 服务边界与支持 ===== */
.page-about__support {
  padding-top: 84px;
  padding-bottom: 84px;
}

.page-about__support-panel {
  position: relative;
  overflow: hidden;
  border-radius: calc(var(--radius) + 6px);
  padding: 38px 30px;
}

.page-about__support-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(245, 239, 224, .035) 0 1px, transparent 1px 4px),
    linear-gradient(135deg, rgba(200, 240, 0, .07), transparent 46%);
  pointer-events: none;
  z-index: 0;
}

.page-about__support-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
}

.page-about__kicker-neon {
  color: var(--color-neon);
}

.page-about__support-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.8vw, 44px);
  line-height: 1.12;
  color: var(--color-cream);
  margin: 10px 0 16px;
  position: relative;
}

.page-about__support-title .page-about__ghost-index {
  color: rgba(245, 239, 224, .08);
}

.page-about__support-copy p {
  color: rgba(245, 239, 224, .85);
  font-size: 16px;
  line-height: 1.85;
  max-width: 560px;
}

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

.page-about__btn-onblue {
  border-color: rgba(245, 239, 224, .45);
  color: var(--color-cream);
}

.page-about__btn-onblue:hover {
  background: rgba(245, 239, 224, .1);
}

.page-about__support-card {
  background: rgba(245, 239, 224, .07);
  border: 1px solid rgba(162, 184, 204, .28);
  border-radius: var(--radius);
  padding: 26px 26px 22px;
  align-self: center;
}

.page-about__support-list {
  margin: 0;
}

.page-about__support-row {
  display: grid;
  gap: 5px;
  padding: 15px 0;
  border-bottom: 1px dashed rgba(162, 184, 204, .3);
}

.page-about__support-row:last-child {
  border-bottom: 0;
}

.page-about__support-row dt {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--color-gold);
}

.page-about__support-row dd {
  margin: 0;
  color: var(--color-cream);
  font-weight: 600;
  font-size: 15px;
  line-height: 1.6;
  word-break: break-word;
}

.page-about__support-note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(245, 239, 224, .62);
}

/* ===== 官方标识 ===== */
.page-about__identity {
  padding-top: 84px;
  padding-bottom: 84px;
}

.page-about__identity-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about__identity-list {
  list-style: none;
  margin: 28px 0;
  padding: 0;
  border-top: 2px solid var(--color-brown);
}

.page-about__identity-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 15px 2px;
  border-bottom: 1px dashed rgba(26, 22, 18, .16);
}

.page-about__identity-list span {
  font-size: 13px;
  letter-spacing: .1em;
  color: rgba(26, 22, 18, .55);
}

.page-about__identity-list strong {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .03em;
  color: var(--color-blue);
  text-align: right;
}

.page-about__trust {
  margin: 0 0 28px;
  padding: 18px 20px 18px 24px;
  border-left: 4px solid var(--color-gold);
  background: var(--color-warm);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(26, 22, 18, .82);
}

.page-about__identity-figure {
  margin: 0;
}

.page-about__identity-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  aspect-ratio: 12 / 5;
  object-fit: cover;
}

/* ===== CTA 深红带 ===== */
.page-about__cta {
  background: var(--color-red);
  color: var(--color-cream);
  position: relative;
  overflow: hidden;
}

.page-about__cta::before {
  content: "TRUST";
  position: absolute;
  right: -10px;
  bottom: -34px;
  font-family: var(--font-display);
  font-size: clamp(70px, 13vw, 160px);
  line-height: 1;
  letter-spacing: .04em;
  color: rgba(245, 239, 224, .08);
  white-space: nowrap;
  pointer-events: none;
}

.page-about__cta-inner {
  display: grid;
  gap: 26px;
  padding-top: 52px;
  padding-bottom: 54px;
  position: relative;
  z-index: 1;
}

.page-about__kicker-light {
  color: rgba(245, 239, 224, .92);
}

.page-about__cta-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.05;
  color: var(--color-cream);
  margin: 8px 0 14px;
}

.page-about__cta-copy p {
  color: rgba(245, 239, 224, .9);
  font-size: 16px;
  line-height: 1.85;
  max-width: 560px;
}

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

.page-about__cta-ghost {
  border-color: rgba(245, 239, 224, .6);
  color: var(--color-cream);
}

.page-about__cta-ghost:hover {
  background: rgba(245, 239, 224, .1);
}

/* ===== 动效增强 ===== */
@supports (animation-timeline: view()) {
  .page-about__timeline-svg {
    animation: pageAboutTimelineReveal linear both;
    animation-timeline: view();
    animation-range: entry 10% entry 85%;
    transform-origin: 50% top;
  }
}

@keyframes pageAboutTimelineReveal {
  from {
    transform: scaleY(0);
  }
  to {
    transform: scaleY(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .page-about__pillar-card,
  .page-about .page-about__timeline-card,
  .page-about .page-about__manifesto-point {
    transition: none;
  }

  .page-about__timeline-svg {
    animation: none;
  }
}

/* ===== 桌面端布局 ===== */
@media (min-width: 768px) {
  .page-about__timeline-banner img {
    height: 250px;
  }

  .page-about__timeline-caption {
    left: max(20px, calc((100% - var(--content-max)) / 2 + 20px));
  }

  .page-about__manifesto-points {
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
  }

  .page-about__support-panel {
    padding: 48px 44px;
  }
}

@media (min-width: 860px) {
  .page-about__hero-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 60px;
    align-items: end;
  }

  .page-about__pillars-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
  }
}

@media (min-width: 900px) {
  .page-about__manifesto-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .85fr);
    gap: 70px;
    align-items: start;
  }

  .page-about__support-grid {
    grid-template-columns: 1.15fr .85fr;
    gap: 48px;
    align-items: center;
  }

  .page-about__identity-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 70px;
  }

  .page-about__cta-inner {
    grid-template-columns: 1fr auto;
    gap: 44px;
    align-items: center;
  }

  .page-about__cta-actions {
    justify-content: flex-end;
  }
}