/* =========================================================
   PAGE: about 品牌概况 / 时间轴布局
   所有选择器限定在 .page-about 作用域内
   ========================================================= */
.page-about {
  --about-glow-green: rgba(57, 255, 20, 0.35);
  --about-glow-orange: rgba(255, 106, 0, 0.30);
  position: relative;
  max-width: 1380px;
  margin: 0 auto;
  padding: 28px 20px 72px;
  isolation: isolate;
}

/* ---------- 共享章节标题的页面级节奏 ---------- */
.page-about .about-head {
  position: relative;
  margin: 0 0 28px;
  padding-left: 18px;
  border-left: 3px solid var(--accent-neon);
}

.page-about .about-head .section-title {
  font-size: 28px;
  font-weight: 800;
  font-style: italic;
  letter-spacing: -0.5px;
  color: var(--text-light);
  line-height: 1.25;
}

.page-about .about-head .section-subtitle {
  margin-bottom: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-neon);
}

.page-about .about-head__note {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-muted);
}

/* ---------- 首屏：分屏叙事 + CSS 版本视觉 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 18px 0 48px;
}

.page-about .about-hero::after {
  content: "";
  display: block;
  width: 96px;
  height: 3px;
  margin-top: 44px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--accent-neon), var(--accent-orange));
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
  margin-top: 28px;
}

.page-about .about-hero__title {
  margin: 18px 0 14px;
  font-size: 32px;
  line-height: 1.24;
  font-weight: 800;
  font-style: italic;
  letter-spacing: -0.5px;
  color: var(--text-light);
}

.page-about .about-hero__lead {
  max-width: 36em;
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

/* 首屏纯 CSS 视觉：斜切瓷片 + V 字演进 */
.page-about .about-hero__art {
  position: relative;
  height: 300px;
  border-radius: 24px;
  border: 1px solid rgba(192, 192, 192, 0.16);
  background:
    radial-gradient(circle at 66% 24%, rgba(57, 255, 20, 0.12), transparent 34%),
    radial-gradient(circle at 20% 82%, rgba(255, 106, 0, 0.10), transparent 30%),
    linear-gradient(155deg, rgba(57, 255, 20, 0.06), transparent 45%, rgba(255, 106, 0, 0.05)),
    var(--card-bg);
  overflow: hidden;
  clip-path: polygon(0 2%, 100% 0, 100% 98%, 0 88%);
}

.page-about .about-hero__field {
  position: absolute;
  inset: 0;
}

.page-about .about-hero__badge {
  position: absolute;
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  line-height: 1;
  letter-spacing: -2px;
  transform: skewX(-14deg);
}

.page-about .about-hero__badge--v1 {
  top: 18%;
  left: 6%;
  font-size: 46px;
  color: var(--text-muted);
}

.page-about .about-hero__badge--v2 {
  top: 44%;
  left: 32%;
  font-size: 64px;
  color: rgba(224, 230, 255, 0.5);
}

.page-about .about-hero__badge--v3 {
  top: 68%;
  left: 62%;
  font-size: 96px;
  color: var(--accent-neon);
  text-shadow: 0 0 28px var(--about-glow-green);
}

.page-about .about-hero__line {
  position: absolute;
  display: block;
  height: 2px;
  transform-origin: left center;
}

.page-about .about-hero__line--a {
  width: 180px;
  top: 40px;
  left: -20px;
  transform: rotate(-30deg);
  background: linear-gradient(90deg, rgba(57, 255, 20, 0.55), transparent);
}

.page-about .about-hero__line--b {
  width: 220px;
  top: 116px;
  left: 30px;
  transform: rotate(-30deg);
  background: linear-gradient(90deg, rgba(255, 106, 0, 0.40), transparent);
}

.page-about .about-hero__dot {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-orange);
  box-shadow: 0 0 12px var(--about-glow-orange);
}

.page-about .about-hero__dot--a {
  top: 26%;
  right: 12%;
}

.page-about .about-hero__dot--b {
  top: 72%;
  right: 28%;
  width: 4px;
  height: 4px;
}

.page-about .about-hero__dot--c {
  top: 10%;
  right: 40%;
  width: 4px;
  height: 4px;
  background: var(--accent-neon);
  box-shadow: 0 0 12px var(--about-glow-green);
}

/* ---------- 品牌故事：版次横幅 + 横向滚动时间轴 ---------- */
.page-about .about-story {
  position: relative;
  margin-top: 56px;
}

.page-about .about-story__banner {
  margin: 0 0 28px;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(192, 192, 192, 0.12);
  background: var(--card-bg);
}

.page-about .about-story__banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 1200px;
  object-fit: cover;
}

.page-about .about-timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(78vw, 340px);
  gap: 24px;
  padding: 28px 4px 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding-left: 4px;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-neon) rgba(20, 26, 46, 0.8);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline__card {
  position: relative;
  padding: 30px 22px 24px;
  border-radius: var(--radius-lg);
  background: var(--card-bg);
  border: 1px solid rgba(192, 192, 192, 0.13);
  scroll-snap-align: start;
}

.page-about .about-timeline__version {
  display: inline-flex;
  align-items: center;
  margin-bottom: 14px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--matt-black);
  border: 1px solid rgba(192, 192, 192, 0.35);
  color: var(--metal-silver);
  font-size: 13px;
  font-weight: 700;
  font-style: italic;
}

.page-about .about-timeline__card:nth-child(2) .about-timeline__version {
  border-color: rgba(57, 255, 20, 0.55);
  color: var(--accent-neon);
  box-shadow: var(--glow-neon);
}

.page-about .about-timeline__card:nth-child(3) .about-timeline__version {
  border-color: rgba(255, 106, 0, 0.65);
  color: var(--accent-orange);
  box-shadow: var(--glow-orange);
}

.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--text-light);
}

.page-about .about-timeline__desc {
  margin: 0 0 16px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-timeline__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__list li {
  position: relative;
  padding-left: 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-light);
}

.page-about .about-timeline__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-neon);
}

.page-about .about-timeline__card:nth-child(3) .about-timeline__list li::before {
  background: var(--accent-orange);
}

.page-about .about-timeline__hint {
  margin: 8px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* ---------- 数据规模：LED 数字 + 斜切柱状图 ---------- */
.page-about .about-data {
  margin-top: 64px;
}

.page-about .about-data__layout {
  display: grid;
  gap: 22px;
  margin-top: 28px;
}

.page-about .about-data__panel {
  display: grid;
  gap: 24px;
  padding: 26px 20px;
  border-radius: 24px;
  border: 1px solid rgba(192, 192, 192, 0.14);
  background:
    linear-gradient(150deg, rgba(57, 255, 20, 0.08), rgba(255, 106, 0, 0.04)),
    var(--card-bg);
  position: relative;
  overflow: hidden;
}

.page-about .about-data__panel::after {
  content: "";
  position: absolute;
  right: -24px;
  bottom: -30px;
  width: 180px;
  height: 180px;
  border: 2px solid rgba(192, 192, 192, 0.08);
  transform: rotate(28deg);
  border-radius: 24px;
  pointer-events: none;
}

.page-about .about-data__stats {
  display: grid;
  gap: 14px;
}

.page-about .about-data__stat {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 14px;
  border-left: 3px solid var(--accent-neon);
  border-radius: var(--radius-md);
  background: rgba(10, 14, 26, 0.75);
}

.page-about .about-data__num {
  min-width: 76px;
  font-family: var(--font-body);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -1px;
  color: var(--accent-neon);
  text-shadow: 0 0 16px var(--about-glow-green);
}

.page-about .about-data__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.page-about .about-data__text strong {
  font-size: 15px;
  color: var(--text-light);
}

.page-about .about-data__text span {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
}

.page-about .about-data__chart {
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  gap: 14px;
  height: 220px;
  padding: 20px 14px 10px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(192, 192, 192, 0.10);
  background: linear-gradient(180deg, rgba(10, 14, 26, 0.92), rgba(20, 26, 46, 0.86));
}

.page-about .about-data__bar-col {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  gap: 6px;
  height: 100%;
  flex: 1;
}

.page-about .about-data__bar-value {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-light);
}

.page-about .about-data__bar {
  display: block;
  width: 100%;
  max-width: 60px;
  min-height: 12px;
  border-radius: 8px 8px 3px 3px;
  background: linear-gradient(180deg, var(--accent-neon), rgba(57, 255, 20, 0.25));
  clip-path: polygon(0 0, 100% 12%, 100% 100%, 0 88%);
}

.page-about .about-data__bar-col:nth-child(1) .about-data__bar {
  height: 24%;
}

.page-about .about-data__bar-col:nth-child(2) .about-data__bar {
  height: 66%;
}

.page-about .about-data__bar-col:nth-child(3) .about-data__bar {
  height: 100%;
  background: linear-gradient(180deg, var(--accent-orange), rgba(255, 106, 0, 0.25));
}

.page-about .about-data__bar-label {
  font-size: 12px;
  color: var(--text-muted);
}

.page-about .about-data__media {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(192, 192, 192, 0.12);
  background: var(--card-bg);
  aspect-ratio: 3 / 2;
}

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

.page-about .about-data__note {
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 3px solid var(--accent-orange);
  border-radius: var(--radius-md);
  background: rgba(57, 255, 20, 0.05);
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-muted);
}

/* ---------- 技术特点：非对称卡片 + 斜切切角 ---------- */
.page-about .about-tech {
  margin-top: 64px;
}

.page-about .about-tech__grid {
  display: grid;
  gap: 22px;
  margin-top: 28px;
}

.page-about .about-tech__card {
  position: relative;
  padding: 28px 22px 30px;
  border-radius: var(--radius-lg);
  background: var(--card-bg);
  border: 1px solid rgba(192, 192, 192, 0.14);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), 0 100%);
  transition:
    transform var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.page-about .about-tech__card:nth-child(3) {
  border-left: 3px solid var(--accent-orange);
}

.page-about .about-tech__icon {
  display: block;
  width: 44px;
  height: 44px;
  margin-bottom: 18px;
  color: var(--accent-neon);
}

.page-about .about-tech__card:nth-child(3) .about-tech__icon {
  color: var(--accent-orange);
}

.page-about .about-tech__card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-light);
}

.page-about .about-tech__card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--text-muted);
}

.page-about .about-tech__feature {
  display: grid;
  gap: 20px;
  margin-top: 40px;
  padding: 26px 22px;
  border-radius: 24px;
  border: 1px solid rgba(192, 192, 192, 0.14);
  background: rgba(17, 17, 17, 0.55);
}

.page-about .about-tech__media {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(192, 192, 192, 0.12);
  background: var(--card-bg);
  aspect-ratio: 4 / 3;
}

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

.page-about .about-tech__info h3 {
  margin: 0 0 12px;
  font-size: 21px;
  font-weight: 700;
  color: var(--text-light);
}

.page-about .about-tech__info p {
  margin: 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--text-muted);
}

.page-about .about-tech__list {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tech__list li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about .about-tech__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 7px;
  height: 7px;
  transform: rotate(45deg);
  border-radius: 1px;
  background: var(--accent-neon);
}

/* ---------- 继续探索：斜面渐变收束区 ---------- */
.page-about .about-cross {
  position: relative;
  margin-top: 56px;
  padding: 40px 22px;
  text-align: center;
  border-radius: 24px;
  border: 1px solid rgba(192, 192, 192, 0.14);
  background:
    linear-gradient(135deg, rgba(57, 255, 20, 0.08), transparent 45%, rgba(255, 106, 0, 0.08)),
    var(--card-bg);
  overflow: hidden;
}

.page-about .about-cross::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-orange), transparent);
}

.page-about .about-cross__title {
  margin: 0;
  font-size: 28px;
  font-weight: 800;
  font-style: italic;
  color: var(--text-light);
}

.page-about .about-cross__lead {
  margin: 12px auto 0;
  max-width: 30em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-cross__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 24px;
}

/* ---------- 桌面端增强：分栏、时间轴轨道、非对称节奏 ---------- */
@media (min-width: 860px) {
  .page-about {
    padding: 36px 32px 88px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 48px;
  }

  .page-about .about-hero__title {
    font-size: 44px;
    line-height: 1.2;
  }

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

  .page-about .about-hero__art {
    height: 380px;
  }

  .page-about .about-hero__badge--v3 {
    font-size: 120px;
  }

  .page-about .about-head .section-title {
    font-size: 34px;
  }

  .page-about .about-head__note {
    max-width: 46em;
  }

  .page-about .about-story__banner {
    border-radius: 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    gap: 28px;
    grid-auto-columns: 1fr;
    grid-auto-flow: column;
    overflow-x: visible;
    scroll-snap-type: none;
    padding-top: 0;
    position: relative;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 2px;
    left: 12%;
    right: 12%;
    height: 2px;
    background: linear-gradient(90deg, rgba(57, 255, 20, 0.60), rgba(255, 106, 0, 0.60));
    opacity: 0.55;
  }

  .page-about .about-timeline__card {
    margin-top: 32px;
  }

  .page-about .about-timeline__card::before {
    content: "";
    position: absolute;
    top: -32px;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--metal-silver);
    box-shadow: 0 0 0 5px rgba(192, 192, 192, 0.12);
  }

  .page-about .about-timeline__card:nth-child(2)::before {
    background: var(--accent-neon);
    box-shadow: 0 0 0 5px rgba(57, 255, 20, 0.14), 0 0 18px var(--about-glow-green);
  }

  .page-about .about-timeline__card:nth-child(3)::before {
    background: var(--accent-orange);
    box-shadow: 0 0 0 5px rgba(255, 106, 0, 0.14), 0 0 18px var(--about-glow-orange);
  }

  .page-about .about-timeline__hint {
    display: none;
  }

  .page-about .about-data__layout {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: stretch;
  }

  .page-about .about-data__panel {
    padding: 30px 26px;
  }

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

  .page-about .about-tech__grid {
    grid-template-columns: 1.1fr 0.9fr 1.1fr;
    align-items: start;
    gap: 26px;
  }

  .page-about .about-tech__card:nth-child(2) {
    margin-top: 48px;
  }

  .page-about .about-tech__card:nth-child(3) {
    margin-top: 24px;
  }

  .page-about .about-tech__feature {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
    gap: 28px;
    padding: 32px 28px;
  }
}