/* ===== 品牌概况页专属样式 ===== */
.page-about {
  --about-hero-offset: clamp(3rem, 10vh, 6rem);
  --about-timeline-min: 880px;
  background: var(--c-space);
  color: var(--c-silver);
  overflow-x: hidden;
}

.page-about .container {
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem var(--gutter) 0;
  max-width: var(--container);
  margin: 0 auto;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--c-slate);
}

.page-about .breadcrumb-item a {
  color: var(--c-info);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .breadcrumb-item a:hover {
  color: var(--c-accent);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 0.75rem;
  color: var(--c-slate);
}

/* 首屏 Hero */
.page-about .about-hero {
  position: relative;
  min-height: 72vh;
  display: flex;
  align-items: center;
  padding: var(--about-hero-offset) var(--gutter);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 72% 18%, rgba(46, 92, 184, 0.32), transparent 60%),
    radial-gradient(ellipse at 18% 82%, rgba(255, 106, 0, 0.10), transparent 48%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "01";
  position: absolute;
  right: -0.15em;
  bottom: -0.28em;
  font-family: var(--font-head);
  font-size: clamp(11rem, 28vw, 22rem);
  font-weight: 800;
  line-height: 1;
  color: rgba(22, 51, 122, 0.10);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
}

.page-about .about-hero__kicker {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 1rem;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 7vw, 4.25rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--c-white);
  margin-bottom: 1.4rem;
  max-width: 640px;
}

.page-about .about-hero__desc {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  line-height: 1.8;
  color: var(--c-silver);
  max-width: 600px;
  margin-bottom: 2.25rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* 品牌故事 */
.page-about .brand-story {
  position: relative;
  padding-block: clamp(4rem, 9vw, 7.5rem);
}

.page-about .brand-story::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(46, 92, 184, 0), rgba(46, 92, 184, 0.35), rgba(46, 92, 184, 0));
}

.page-about .section-head {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .section-index {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1;
  color: rgba(46, 92, 184, 0.28);
  min-width: 1.4em;
}

.page-about .section-title {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--c-white);
  margin: 0;
}

.page-about .brand-story__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.page-about .brand-story__text p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-silver);
  margin-bottom: 1.2rem;
}

.page-about .brand-story__text b {
  color: var(--c-white);
  font-weight: 700;
}

.page-about .brand-story__text a {
  color: var(--c-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 0, 0.4);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .brand-story__text a:hover {
  border-color: var(--c-accent);
  color: var(--c-accent-soft);
}

.page-about .brand-story__figure {
  margin: 0;
  position: relative;
}

.page-about .brand-story__figure::after {
  content: "NOTICE · 2016—2023";
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-silver);
  background: rgba(11, 26, 58, 0.72);
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  backdrop-filter: blur(6px);
}

.page-about .brand-story__figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.25);
}

/* 发展历程 */
.page-about .timeline-section {
  position: relative;
  padding-block: clamp(4rem, 9vw, 7.5rem);
  background: linear-gradient(180deg, rgba(22, 51, 122, 0.28), rgba(22, 51, 122, 0));
}

.page-about .timeline-section__desc {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-slate);
  max-width: 560px;
  margin: 0 0 2.5rem;
}

.page-about .timeline-scroll {
  overflow-x: auto;
  padding-bottom: 1rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(46, 92, 184, 0.5) rgba(11, 26, 58, 0.4);
}

.page-about .timeline-scroll::-webkit-scrollbar {
  height: 4px;
}

.page-about .timeline-scroll::-webkit-scrollbar-track {
  background: rgba(11, 26, 58, 0.4);
  border-radius: 2px;
}

.page-about .timeline-scroll::-webkit-scrollbar-thumb {
  background: rgba(46, 92, 184, 0.5);
  border-radius: 2px;
}

.page-about .timeline-track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(210px, 1fr));
  gap: 2rem;
  min-width: var(--about-timeline-min);
  padding-block: 0.6rem 1rem;
}

.page-about .timeline-track__line {
  position: absolute;
  top: 0.9rem;
  left: 8px;
  width: calc(100% - 16px);
  height: 4px;
  pointer-events: none;
  overflow: visible;
}

.page-about .timeline-track__line line {
  stroke: rgba(46, 92, 184, 0.35);
  stroke-width: 1;
  stroke-dasharray: 8 6;
}

.page-about .timeline-node {
  position: relative;
}

.page-about .timeline-node__dot {
  display: block;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--c-info);
  box-shadow: 0 0 0 5px rgba(46, 92, 184, 0.14);
  margin-bottom: 1.1rem;
  position: relative;
  z-index: 1;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .timeline-node:hover .timeline-node__dot {
  background: var(--c-accent);
  box-shadow: 0 0 0 8px rgba(255, 106, 0, 0.16);
  transform: translateY(-2px);
}

.page-about .timeline-node--current .timeline-node__dot {
  background: var(--c-accent);
  box-shadow: 0 0 0 7px rgba(255, 106, 0, 0.16);
}

.page-about .timeline-node__year {
  display: block;
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--c-white);
  margin-bottom: 0.4rem;
}

.page-about .timeline-node__label {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-info);
  margin-bottom: 0.6rem;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: rgba(46, 92, 184, 0.08);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .timeline-node:hover .timeline-node__label {
  color: var(--c-accent);
  background: rgba(255, 106, 0, 0.08);
}

.page-about .timeline-node--current .timeline-node__label {
  color: var(--c-accent);
  background: rgba(255, 106, 0, 0.09);
}

.page-about .timeline-node__detail {
  display: block;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-slate);
  transition: color var(--dur) var(--ease);
}

.page-about .timeline-node:hover .timeline-node__detail {
  color: var(--c-silver);
}

.page-about .timeline-section__figure {
  margin: 2.5rem 0 0;
  max-width: 800px;
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .timeline-section__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

/* 内容生产流程 */
.page-about .production-section {
  padding-block: clamp(4rem, 9vw, 7.5rem);
  position: relative;
}

.page-about .production-section__desc {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-slate);
  max-width: 560px;
  margin: 0 0 2.5rem;
}

.page-about .production-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .production-step {
  position: relative;
  background: rgba(22, 51, 122, 0.32);
  border: 1px solid rgba(46, 92, 184, 0.18);
  border-radius: var(--radius);
  padding: 2rem 1.75rem 1.75rem;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .production-step:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.22);
  border-color: rgba(46, 92, 184, 0.45);
}

.page-about .production-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  margin-bottom: 1rem;
}

.page-about .production-step__title {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 0.75rem;
}

.page-about .production-step p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-slate);
  margin: 0;
}

.page-about .production-section__figure {
  margin: 2.5rem 0 0;
  max-width: 1000px;
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .production-section__figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

/* 资质与合规（浅色区） */
.page-about .compliance-section.t-light {
  background: var(--c-silver);
  color: var(--c-ink);
  padding-block: clamp(4rem, 9vw, 7.5rem);
}

.page-about .compliance-section.t-light .section-title {
  color: var(--c-ink);
}

.page-about .compliance-section.t-light .section-index {
  color: rgba(26, 32, 44, 0.18);
}

.page-about .compliance-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-card);
}

.page-about .compliance-item {
  background: var(--c-white);
  border: 1px solid rgba(26, 32, 44, 0.08);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  box-shadow: 0 2px 10px rgba(11, 26, 58, 0.04);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .compliance-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(11, 26, 58, 0.10);
}

.page-about .compliance-item__title {
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 0.875rem;
}

.page-about .compliance-item p {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-slate);
  margin: 0;
}

.page-about .compliance-item b {
  color: var(--c-ink);
  font-weight: 700;
}

/* 支持与服务 */
.page-about .support-section {
  padding-block: clamp(4rem, 9vw, 7.5rem);
  position: relative;
}

.page-about .support-section::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent), rgba(255, 106, 0, 0.05), rgba(46, 92, 184, 0.3));
}

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

.page-about .support-item {
  border: 1px dashed rgba(46, 92, 184, 0.35);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
  background: rgba(22, 51, 122, 0.16);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .support-item:hover {
  background: rgba(22, 51, 122, 0.30);
  border-color: var(--c-accent);
  transform: translateY(-3px);
}

.page-about .support-item__title {
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 0.6rem;
}

.page-about .support-item__text {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--c-silver);
  margin-bottom: 0.5rem;
  word-break: break-all;
}

.page-about .support-item__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--c-slate);
  margin: 0;
}

.page-about .support-note {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-silver);
  max-width: 640px;
  margin: 2.25rem 0 1rem;
}

.page-about .support-note a {
  color: var(--c-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 0, 0.4);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .support-note a:hover {
  border-color: var(--c-accent);
  color: var(--c-accent-soft);
}

.page-about .support-trust {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--c-slate);
  max-width: 720px;
  margin: 1.5rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(46, 92, 184, 0.18);
}

/* 平板及以上 */
@media (min-width: 700px) {
  .page-about .brand-story__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: clamp(2rem, 6vw, 4rem);
    align-items: center;
  }

  .page-about .brand-story__text p {
    font-size: 1.0625rem;
  }

  .page-about .production-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

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

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .production-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 2.5rem;
  }

  .page-about .production-step:not(:last-child)::after {
    content: "→";
    position: absolute;
    right: -2rem;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-head);
    font-size: 1.625rem;
    font-weight: 300;
    color: var(--c-accent);
    z-index: 2;
    pointer-events: none;
  }

  .page-about .timeline-scroll {
    overflow-x: visible;
  }

  .page-about .timeline-track {
    min-width: 0;
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .support-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
  }
}

/* 动效安全 */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}