/* ===== page-about 品牌档案 ===== */
.page-about {
  --about-green-line: rgba(0, 232, 143, 0.28);
  --about-purple-line: rgba(157, 92, 255, 0.32);
  --about-grid-line: rgba(160, 170, 191, 0.07);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

.page-about img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 英雄区 ===== */
.page-about .about-hero {
  position: relative;
  padding: 32px 20px 72px;
  overflow: hidden;
  background: linear-gradient(145deg, rgba(11, 27, 63, 0.95) 0%, rgba(10, 15, 36, 0.97) 70%);
  border-bottom: 1px solid var(--about-green-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 34%;
  height: 6px;
  background: linear-gradient(90deg, var(--color-green), var(--color-purple));
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-hero__topline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
  font-size: 13px;
  letter-spacing: 0.08em;
}

.page-about .about-hero__code {
  color: var(--color-purple);
}

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

.page-about .about-hero__kicker {
  margin-bottom: 12px;
  color: var(--color-green);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-size: clamp(30px, 7vw, 58px);
  font-weight: 900;
  font-style: italic;
  line-height: 1.12;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.page-about .about-hero__lead {
  max-width: 720px;
  margin: 0;
  color: var(--color-muted);
  font-size: 17px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .about-hero__stat {
  padding: 16px 18px;
  background: rgba(11, 27, 63, 0.65);
  border-left: 2px solid var(--color-green);
}

.page-about .about-hero__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-green);
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 4px;
  color: var(--color-muted);
  font-size: 13px;
}

.page-about .about-hero__decor {
  position: absolute;
  right: 0;
  bottom: 12px;
  left: 0;
  height: 200px;
  z-index: 0;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__decor svg {
  width: 100%;
  height: 100%;
}

.page-about .about-hero__decor circle {
  animation: aboutPulse 3s ease-in-out infinite;
}

@keyframes aboutPulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* ===== 主体双栏布局 ===== */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-sections {
  min-width: 0;
}

/* ===== 侧边索引 ===== */
.page-about .about-toc {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 24px 20px 0;
  padding: 16px 14px;
  background: rgba(11, 27, 63, 0.55);
  border: 1px solid var(--about-purple-line);
  box-shadow: 0 0 28px rgba(157, 92, 255, 0.06);
}

.page-about .about-toc__label {
  display: none;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--color-muted);
}

.page-about .about-toc__link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 6px;
  font-size: 13px;
  color: var(--color-text);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.page-about .about-toc__link:hover {
  border-left-color: var(--color-green);
  background: rgba(0, 232, 143, 0.08);
  color: var(--color-green);
}

.page-about .about-toc__index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-purple);
}

/* ===== 通用章节 ===== */
.page-about .about-section {
  padding: 56px 20px 64px;
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .about-mission {
  position: relative;
  border-bottom: 1px solid rgba(160, 170, 191, 0.1);
}

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

.page-about .about-mission__lead {
  margin: 18px 0 12px;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--color-text);
}

.page-about .about-mission__paragraph {
  margin: 0 0 14px;
  color: var(--color-muted);
}

.page-about .about-mission__media {
  margin-top: 28px;
  border: 1px solid var(--about-green-line);
}

.page-about .about-mission__principles {
  display: grid;
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--about-purple-line);
}

.page-about .about-mission__principle {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(160, 170, 191, 0.12);
}

.page-about .about-mission__alpha {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-purple);
  color: var(--color-purple);
  font-size: 14px;
  background: rgba(157, 92, 255, 0.06);
}

.page-about .about-mission__principle-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
}

.page-about .about-mission__principle p {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
}

/* ===== 技术架构 ===== */
.page-about .about-architecture {
  position: relative;
  background:
    radial-gradient(circle at 78% 20%, rgba(157, 92, 255, 0.16), transparent 34%),
    linear-gradient(180deg, rgba(11, 27, 63, 0.96), rgba(10, 15, 36, 0.98));
  border-top: 1px solid var(--about-purple-line);
  border-bottom: 1px solid var(--about-green-line);
}

.page-about .about-architecture__header {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .about-architecture__lead,
.page-about .about-milestones__lead,
.page-about .about-security__lead {
  margin: 0;
  color: var(--color-muted);
  font-size: 16px;
}

.page-about .about-architecture__pipeline {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-architecture__stage {
  padding: 26px 22px;
  border: 1px solid rgba(160, 170, 191, 0.16);
  border-top: 3px solid var(--color-green);
  background: rgba(10, 15, 36, 0.6);
  transition: transform 0.2s, border-color 0.2s;
}

.page-about .about-architecture__stage:nth-child(2) {
  border-top-color: var(--color-purple);
}

.page-about .about-architecture__stage:nth-child(3) {
  border-top-color: var(--color-gold);
}

.page-about .about-architecture__stage:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 232, 143, 0.4);
}

.page-about .about-architecture__stage-index {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--color-purple);
}

.page-about .about-architecture__stage-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
}

.page-about .about-architecture__stage-desc {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.page-about .about-architecture__media {
  margin-top: 32px;
  border: 1px solid var(--about-purple-line);
}

.page-about .about-architecture__note {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  color: var(--color-muted);
  font-size: 13px;
}

.page-about .about-architecture__cta {
  margin: 18px 0 0;
  color: var(--color-text);
  font-size: 15px;
}

.page-about .about-architecture__cta a {
  color: var(--color-green);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 232, 143, 0.4);
  transition: border-color 0.2s;
}

.page-about .about-architecture__cta a:hover {
  border-bottom-color: var(--color-green);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  border-bottom: 1px solid rgba(160, 170, 191, 0.1);
}

.page-about .about-milestones__header {
  display: grid;
  gap: 14px;
  margin-bottom: 12px;
}

.page-about .about-milestones__timeline-wrap {
  position: relative;
  margin-top: 32px;
}

.page-about .about-milestones__start {
  position: absolute;
  left: 6px;
  top: -12px;
  z-index: 1;
}

.page-about .about-milestones__start path {
  stroke: var(--color-green);
  stroke-dasharray: 4 6;
  animation: aboutDataFlow 2.4s linear infinite;
}

.page-about .about-milestones__start circle {
  fill: var(--color-purple);
}

@keyframes aboutDataFlow {
  to { stroke-dashoffset: -20; }
}

.page-about .about-milestones__timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-milestones__timeline::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-green), var(--color-purple));
  opacity: 0.35;
}

.page-about .about-milestones__item {
  position: relative;
  margin-bottom: 24px;
  padding-left: 68px;
}

.page-about .about-milestones__node {
  position: absolute;
  left: 0;
  top: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-bg);
  box-shadow: 0 0 0 4px rgba(10, 15, 36, 0.9), 0 0 18px rgba(0, 232, 143, 0.12);
}

.page-about .about-milestones__node svg {
  width: 36px;
  height: 36px;
}

.page-about .about-milestones__card {
  padding: 0;
  border: 1px solid rgba(160, 170, 191, 0.18);
  border-left: 3px solid var(--color-green);
  background: rgba(11, 27, 63, 0.42);
}

.page-about .about-milestones__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
}

.page-about .about-milestones__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-milestones__summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--color-green);
  transition: transform 0.2s;
}

.page-about .about-milestones__card[open] .about-milestones__summary::after {
  content: "–";
  transform: rotate(90deg);
}

.page-about .about-milestones__time {
  color: var(--color-purple);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.page-about .about-milestones__title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
}

.page-about .about-milestones__body {
  padding: 0 20px 20px;
  color: var(--color-muted);
  font-size: 14px;
}

.page-about .about-milestones__body p {
  margin: 0 0 10px;
}

.page-about .about-milestones__body img {
  display: block;
  margin-top: 10px;
  border: 1px solid rgba(157, 92, 255, 0.24);
}

/* ===== 安全与合作 ===== */
.page-about .about-security {
  position: relative;
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 232, 143, 0.1), transparent 42%),
    var(--color-blue);
  border-bottom: 1px solid var(--about-purple-line);
}

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

.page-about .about-security__lead {
  margin-top: 14px;
}

.page-about .about-security__point {
  display: flex;
  gap: 16px;
  margin: 20px 0;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(160, 170, 191, 0.14);
}

.page-about .about-security__point:last-child {
  border-bottom: 0;
}

.page-about .about-security__icon {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-green);
  color: var(--color-green);
  font-size: 14px;
  transform: skewX(-8deg);
  background: rgba(0, 232, 143, 0.06);
}

.page-about .about-security__point-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
}

.page-about .about-security__point p {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.page-about .about-security__badge {
  margin-bottom: 18px;
  padding: 28px 24px;
  border: 1px solid var(--color-purple);
  background: rgba(157, 92, 255, 0.09);
  transform: skewX(-6deg);
  transition: background 0.2s;
}

.page-about .about-security__badge:hover {
  background: rgba(157, 92, 255, 0.15);
}

.page-about .about-security__badge > * {
  transform: skewX(6deg);
}

.page-about .about-security__badge-title {
  margin: 12px 0 4px;
  font-family: var(--font-head);
  font-size: 32px;
  font-weight: 900;
  line-height: 1.2;
}

.page-about .about-security__badge-desc {
  margin: 0;
  color: var(--color-muted);
  font-size: 13px;
}

/* ===== 页间CTA ===== */
.page-about .about-cta {
  padding: 48px 20px 72px;
}

.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 40px 28px;
  border: 1px solid var(--about-green-line);
  background: linear-gradient(135deg, rgba(11, 27, 63, 0.9), rgba(157, 92, 255, 0.12));
  clip-path: polygon(0 0, 96% 0, 100% 18%, 100% 100%, 4% 100%, 0 82%);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 900;
  font-style: italic;
  line-height: 1.3;
}

.page-about .about-cta__desc {
  margin: 8px 0 0;
  color: var(--color-muted);
  font-size: 15px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 平板断点 ===== */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-hero__title {
    font-size: clamp(40px, 6vw, 64px);
  }

  .page-about .about-architecture__cta {
    margin-top: 24px;
  }
}

/* ===== 桌面断点 ===== */
@media (min-width: 900px) {
  .page-about .about-section {
    padding-right: 32px;
    padding-left: 32px;
  }

  .page-about .about-mission__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-architecture__pipeline {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-security__grid {
    grid-template-columns: 1.5fr 0.85fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-security__aside {
    margin-top: 8px;
  }

  .page-about .about-cta__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }

  .page-about .about-cta__actions {
    flex: none;
  }
}

/* ===== 宽桌面：索引吸顶双栏 ===== */
@media (min-width: 1180px) {
  .page-about .about-hero {
    padding-top: 76px;
  }

  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-toc {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin: 96px 0 0;
    padding: 14px 12px;
  }

  .page-about .about-toc__label {
    display: block;
    margin: 0 0 8px;
    padding: 0 8px;
  }

  .page-about .about-toc__link {
    justify-content: flex-start;
    padding: 10px 12px;
    font-size: 14px;
  }

  .page-about .about-sections {
    min-width: 0;
  }

  .page-about .about-section {
    padding: 96px 0;
  }
}

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