/* =============================
   品牌档案页 · page-about
   纵向叙事 + 金色时间轴 + 非对称色块
   ============================= */
.page-about {
  position: relative;
  background: var(--c-bg);
  overflow-x: hidden;
}

/* ---------- 页面首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 64px 0 72px;
  background:
    linear-gradient(135deg, rgba(74, 44, 106, 0.30) 0%, transparent 46%),
    radial-gradient(circle at 82% 22%, rgba(245, 197, 24, 0.10) 0%, transparent 34%),
    var(--c-bg);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(245, 197, 24, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 197, 24, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  margin-bottom: 48px;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: 48px;
  margin-top: 40px;
}

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

.page-about .about-hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin: 0 0 8px;
}

.page-about .about-hero-title {
  position: relative;
  font-family: var(--font-title);
  font-size: 34px;
  line-height: 1.28;
  font-weight: 800;
  color: var(--c-text);
  margin: 0 0 20px;
  padding-left: 18px;
}

.page-about .about-hero-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 5px;
  background: linear-gradient(to bottom, var(--c-gold), var(--c-red));
  border-radius: 2px;
}

.page-about .about-hero-lead {
  font-size: 15px;
  line-height: 1.95;
  color: var(--c-text-dim);
  margin: 0;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 36px;
}

.page-about .about-hero-stat {
  padding: 16px 12px;
  background: rgba(43, 43, 74, 0.55);
  border-top: 3px solid var(--c-gold);
  transition: box-shadow 0.3s var(--ease);
}

.page-about .about-hero-stat:hover {
  box-shadow: var(--shadow);
}

.page-about .about-hero-stat:nth-child(2) {
  border-top-color: var(--c-red);
}

.page-about .about-hero-stat:nth-child(3) {
  border-top-color: var(--c-purple);
}

.page-about .about-hero-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-gold);
}

.page-about .about-hero-unit {
  font-size: 16px;
  margin-left: 2px;
}

.page-about .about-hero-label {
  display: block;
  font-size: 12px;
  color: var(--c-text-dim);
  margin-top: 6px;
}

.page-about .about-hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about .about-hero-emblem {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  width: 100%;
  max-width: 420px;
  padding: 32px 24px;
  border: 2px solid var(--c-gold);
  background:
    linear-gradient(rgba(245, 197, 24, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 197, 24, 0.06) 1px, transparent 1px),
    rgba(43, 43, 74, 0.55);
  background-size: 22px 22px, 22px 22px, auto;
  clip-path: polygon(0 0, 86% 0, 100% 14%, 100% 100%, 14% 100%, 0 86%);
}

.page-about .about-hero-emblem::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(139, 0, 0, 0.45);
  pointer-events: none;
}

.page-about .about-emblem-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.5em;
  color: var(--c-gold);
  text-indent: 0.5em;
}

.page-about .about-emblem-num {
  font-family: var(--font-title);
  font-size: 60px;
  line-height: 1.1;
  font-weight: 900;
  color: var(--c-gold);
  margin: 8px 0 4px;
}

.page-about .about-emblem-line {
  width: 52px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-red), var(--c-gold));
  margin: 10px 0;
}

.page-about .about-emblem-tag {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--c-text-dim);
}

/* ---------- 章节标题 ---------- */
.page-about .about-section-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 36px;
}

.page-about .about-section-number {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-gold);
  border: 1px solid rgba(245, 197, 24, 0.35);
  background: rgba(245, 197, 24, 0.08);
  padding: 5px 10px;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.page-about .about-section-head h2 {
  font-family: var(--font-title);
  font-size: 28px;
  font-weight: 800;
  color: var(--c-text);
  margin: 0;
}

.page-about .about-section-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(245, 197, 24, 0.45), transparent);
}

/* ---------- 01 品牌起源 ---------- */
.page-about .about-origin {
  padding: 72px 0 80px;
}

.page-about .about-origin-grid {
  display: grid;
  gap: 40px;
}

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

.page-about .about-origin-lead {
  font-family: var(--font-title);
  font-size: 18px;
  line-height: 1.7;
  color: var(--c-gold);
  margin: 0 0 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(245, 197, 24, 0.2);
}

.page-about .about-origin-text {
  font-size: 14px;
  line-height: 1.95;
  color: var(--c-text-dim);
  margin: 0 0 16px;
}

.page-about .about-origin-quote {
  margin: 28px 0;
  padding: 20px 22px;
  background: rgba(139, 0, 0, 0.22);
  border-left: 3px solid var(--c-red);
}

.page-about .about-origin-quote p {
  margin: 0;
  font-family: var(--font-title);
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text);
}

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

.page-about .about-origin-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(245, 197, 24, 0.3);
  box-shadow: var(--shadow);
}

.page-about .about-origin-figure figcaption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-text-dim);
  border-left: 2px solid var(--c-red);
  padding-left: 10px;
}

/* ---------- 02 发展里程碑 ---------- */
.page-about .about-milestones {
  position: relative;
  padding: 72px 0 88px;
  background: linear-gradient(180deg, var(--c-bg) 0%, rgba(74, 44, 106, 0.34) 24%, rgba(74, 44, 106, 0.26) 72%, var(--c-bg) 100%);
}

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

.page-about .about-timeline-line {
  position: absolute;
  left: 26px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-gold) 0%, rgba(245, 197, 24, 0.32) 60%, transparent 100%);
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 48px;
}

.page-about .about-timeline-item:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline-node {
  position: absolute;
  left: 17px;
  top: 10px;
  width: 18px;
  height: 18px;
  background: var(--c-gold);
  border: 3px solid var(--c-bg);
  box-shadow: 0 0 0 2px var(--c-gold);
  transform: rotate(45deg);
}

.page-about .about-timeline-card {
  position: relative;
  padding: 20px 22px;
  background: var(--c-blue);
  border-left: 3px solid var(--c-gold);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.3s var(--ease);
}

.page-about .about-timeline-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-width: 0 14px 14px 0;
  border-style: solid;
  border-color: transparent var(--c-red) transparent transparent;
}

.page-about .about-timeline-card:hover {
  transform: translateY(-4px);
}

.page-about .about-timeline-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-gold);
  background: rgba(245, 197, 24, 0.08);
  padding: 4px 10px;
  margin-bottom: 10px;
}

.page-about .about-timeline-card h3 {
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 700;
  color: var(--c-text);
  margin: 0 0 8px;
}

.page-about .about-timeline-card p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-dim);
  margin: 0;
}

.page-about .about-timeline-figure {
  margin: 64px 0 0;
  position: relative;
}

.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  box-shadow: var(--shadow);
}

.page-about .about-timeline-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--c-text-dim);
  text-align: right;
  padding-right: 14px;
}

/* ---------- 03 数据服务理念 ---------- */
.page-about .about-principles {
  padding: 80px 0;
}

.page-about .about-principles-grid {
  display: grid;
  gap: 18px;
}

.page-about .about-principle {
  position: relative;
  padding: 30px 24px 26px;
  background: linear-gradient(150deg, var(--c-blue) 0%, var(--c-bg-alt) 100%);
  border-top: 3px solid var(--c-gold);
  box-shadow: var(--shadow);
}

.page-about .about-principle:nth-child(2) {
  border-top-color: var(--c-red);
}

.page-about .about-principle:nth-child(3) {
  border-top-color: var(--c-purple);
}

.page-about .about-principle-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-gold);
}

.page-about .about-principle h3 {
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-text);
  margin: 10px 0 12px;
}

.page-about .about-principle p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--c-text-dim);
  margin: 0;
}

/* ---------- 04 团队与文化 ---------- */
.page-about .about-team {
  padding: 72px 0 80px;
}

.page-about .about-team-grid {
  display: grid;
  gap: 40px;
}

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

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(74, 44, 106, 0.55);
  box-shadow: var(--shadow);
}

.page-about .about-team-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--c-text-dim);
  text-align: right;
  border-right: 2px solid var(--c-purple);
  padding-right: 10px;
}

.page-about .about-team-copy {
  max-width: 620px;
}

.page-about .about-team-lead {
  font-family: var(--font-title);
  font-size: 18px;
  line-height: 1.7;
  color: var(--c-text);
  margin: 0 0 14px;
}

.page-about .about-team-text {
  font-size: 14px;
  line-height: 1.9;
  color: var(--c-text-dim);
  margin: 0 0 22px;
}

.page-about .about-team-tags {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-team-tags li {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-gold);
  border: 1px solid rgba(245, 197, 24, 0.35);
  background: rgba(245, 197, 24, 0.05);
  padding: 6px 12px;
}

.page-about .about-team-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-about .about-team-list li {
  position: relative;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text-dim);
  padding-left: 24px;
  margin-bottom: 12px;
}

.page-about .about-team-list li::before {
  content: "◆";
  position: absolute;
  left: 0;
  top: 1px;
  font-size: 10px;
  color: var(--c-red);
}

/* ---------- 底部信任声明 ---------- */
.page-about .about-trust {
  padding: 56px 0 76px;
}

.page-about .about-trust-inner {
  position: relative;
  max-width: 680px;
  margin: 0 auto;
  padding: 42px 28px 38px;
  text-align: center;
  background: rgba(43, 43, 74, 0.35);
  border: 1px solid rgba(245, 197, 24, 0.22);
}

.page-about .about-trust-inner::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(139, 0, 0, 0.35);
  pointer-events: none;
}

.page-about .about-trust-title {
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-gold);
  margin: 0 0 12px;
}

.page-about .about-trust-text {
  font-size: 14px;
  line-height: 1.9;
  color: var(--c-text-dim);
  margin: 0 0 24px;
}

.page-about .about-trust-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* ===== 桌面端（≥768px） ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 96px 0 88px;
  }

  .page-about .about-hero .breadcrumb {
    margin-bottom: 64px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-hero-title {
    font-size: 46px;
  }

  .page-about .about-hero-lead {
    font-size: 16px;
  }

  .page-about .about-hero-emblem {
    min-height: 280px;
  }

  /* 01 品牌起源：左文右图 */
  .page-about .about-origin-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
    align-items: center;
  }

  /* 02 发展里程碑：时间轴居中，卡片左右交替 */
  .page-about .about-milestones {
    padding: 96px 0 108px;
  }

  .page-about .about-timeline-line {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-timeline-item {
    display: grid;
    grid-template-columns: 1fr 64px 1fr;
    padding-left: 0;
    margin-bottom: 56px;
  }

  .page-about .about-timeline-item:last-child {
    margin-bottom: 0;
  }

  .page-about .about-timeline-node {
    left: 50%;
    top: 14px;
    transform: translateX(-50%) rotate(45deg);
  }

  .page-about .about-timeline-item:nth-child(odd) .about-timeline-card {
    grid-column: 1;
    margin-right: 28px;
    border-left: none;
    border-right: 3px solid var(--c-gold);
  }

  .page-about .about-timeline-item:nth-child(even) .about-timeline-card {
    grid-column: 3;
    margin-left: 28px;
  }

  .page-about .about-timeline-figure {
    margin-top: 80px;
  }

  .page-about .about-timeline-figure img {
    clip-path: polygon(2% 0, 100% 0, 98% 100%, 0 100%);
  }

  /* 03 数据服务理念：三列 */
  .page-about .about-principles-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-principle:nth-child(2) {
    transform: translateY(14px);
  }

  .page-about .about-principle:nth-child(3) {
    transform: translateY(28px);
  }

  /* 04 团队：左图右文 */
  .page-about .about-team-grid {
    grid-template-columns: 0.92fr 1.08fr;
    gap: 64px;
    align-items: center;
  }
}

/* ===== 大屏增强（≥1024px） ===== */
@media (min-width: 1024px) {
  .page-about .about-hero-title {
    font-size: 52px;
  }

  .page-about .about-hero-lead {
    font-size: 17px;
  }
}