/* ============ 品牌文化页 · page-about ============ */

.page-about {
  --about-rail: 208px;
  --about-gap-x: clamp(24px, 4vw, 56px);
  --about-gap-y: clamp(56px, 9vw, 116px);
  padding-bottom: clamp(64px, 10vw, 132px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(32px, 6vw, 84px));
  padding-bottom: clamp(40px, 7vw, 88px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -12%;
  left: -12%;
  height: 82%;
  background:
    radial-gradient(48% 62% at 18% 34%, rgba(124, 92, 255, 0.20), transparent 70%),
    radial-gradient(42% 56% at 84% 8%, rgba(61, 227, 206, 0.10), transparent 72%),
    radial-gradient(58% 48% at 52% 0%, rgba(255, 138, 61, 0.06), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--rock);
}

.page-about .about-crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-crumbs li + li::before {
  content: "›";
  color: var(--line);
}

.page-about .about-crumbs a {
  color: var(--dust);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 17ch;
  font-size: clamp(34px, 7.4vw, 68px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.012em;
  color: var(--moon);
}

.page-about .about-hero__title .display--step {
  display: block;
  padding-left: clamp(14px, 5vw, 66px);
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(34px, 6vw, 60px);
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 18px);
  font-weight: 300;
  line-height: 1.8;
  color: var(--dust);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 20px;
  margin: 0;
  padding: clamp(24px, 4vw, 34px) 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--moon);
}

.page-about .about-hero__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--rock);
}

/* ---------- 主体布局 ---------- */

.page-about .about-layout {
  display: grid;
  gap: clamp(36px, 6vw, 72px);
}

.page-about .about-toc__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--rock);
}

.page-about .about-toc__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 12px;
  overflow-x: auto;
  list-style: none;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 13px;
  white-space: nowrap;
  color: var(--dust);
  text-decoration: none;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--cyan);
  background: var(--ink-800);
  border-color: var(--line);
}

.page-about .about-toc__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--rock);
}

.page-about .about-body {
  display: grid;
  gap: var(--about-gap-y);
  min-width: 0;
}

/* ---------- 时间线条目 ---------- */

.page-about .tl {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .tl__gutter {
  position: relative;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
  padding-left: 26px;
}

.page-about .tl__dot {
  position: absolute;
  top: 50%;
  left: 0;
  width: 11px;
  height: 11px;
  margin-top: -6px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--ink-900);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--dust);
  transition: color 0.3s var(--ease);
}

.page-about .tl__note {
  font-size: 12px;
  color: var(--rock);
  opacity: 0.55;
  transition: opacity 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .tl__gutter:hover .tl__dot,
.page-about .tl:focus-within .tl__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(61, 227, 206, 0.14);
}

.page-about .tl__gutter:hover .tl__note,
.page-about .tl:focus-within .tl__note {
  opacity: 1;
  color: var(--cyan);
}

.page-about .tl__main {
  position: relative;
  overflow: hidden;
  min-width: 0;
}

.page-about .tl__num {
  position: absolute;
  top: -10px;
  right: 0;
  z-index: 0;
  font-family: var(--font-mono);
  font-size: clamp(58px, 10vw, 108px);
  font-weight: 700;
  line-height: 1;
  color: rgba(233, 238, 247, 0.05);
  pointer-events: none;
  user-select: none;
}

.page-about .tl__title {
  position: relative;
  z-index: 1;
  margin: 0 0 18px;
  padding-right: 48px;
  font-size: clamp(24px, 3.6vw, 36px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.006em;
  color: var(--moon);
}

.page-about .tl__main p {
  position: relative;
  z-index: 1;
  max-width: 66ch;
  margin: 0 0 16px;
  font-size: clamp(15px, 1.5vw, 17px);
  font-weight: 300;
  line-height: 1.85;
  color: var(--dust);
}

.page-about .tl__main p:last-child {
  margin-bottom: 0;
}

.page-about .tl__main a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-color: rgba(61, 227, 206, 0.35);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.25s var(--ease);
}

.page-about .tl__main a:hover,
.page-about .tl__main a:focus-visible {
  text-decoration-color: var(--cyan);
}

.page-about .tl__quote {
  position: relative;
  z-index: 1;
  margin: 26px 0 0;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--clay);
}

.page-about .tl__quote p {
  margin: 0;
  max-width: 44ch;
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 300;
  line-height: 1.7;
  color: var(--moon);
  opacity: 0.86;
}

/* ---------- 三组分工 ---------- */

.page-about .about-roles {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 1px;
  margin: 26px 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
  list-style: none;
}

.page-about .about-roles li {
  display: flex;
  gap: 16px;
  padding: 20px clamp(16px, 3vw, 26px);
  background: var(--ink-800);
}

.page-about .about-roles__no {
  flex: 0 0 auto;
  width: 40px;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.25;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
}

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

.page-about .about-roles__name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--moon);
}

.page-about .about-roles__body p {
  margin: 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 横向主题带 ---------- */

.page-about .about-strip {
  position: relative;
  padding: clamp(28px, 5vw, 46px) clamp(22px, 4vw, 44px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(118deg, rgba(201, 111, 74, 0.16), rgba(12, 18, 32, 0.94) 64%),
    var(--ink-800);
  overflow: hidden;
}

.page-about .about-strip::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--clay), rgba(201, 111, 74, 0.16));
}

.page-about .about-strip__quote {
  margin: 0 0 12px;
  max-width: 26ch;
  font-size: clamp(20px, 3.4vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.005em;
  color: var(--moon);
}

.page-about .about-strip__byline {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

/* ---------- 色板信息图 ---------- */

.page-about .about-palette {
  position: relative;
  z-index: 1;
  margin: 30px 0;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .about-palette__caption {
  margin: 0 0 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .about-palette__bar {
  display: block;
  width: 100%;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.page-about .about-palette__legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px 20px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-palette__legend li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--dust);
}

.page-about .about-palette__chip {
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  border: 1px solid var(--line);
  border-radius: 3px;
}

.page-about .about-palette__chip--ink { background: #05070F; }
.page-about .about-palette__chip--panel { background: #0C1220; }
.page-about .about-palette__chip--cyan { background: #3DE3CE; border-color: #3DE3CE; }
.page-about .about-palette__chip--amber { background: #FF8A3D; border-color: #FF8A3D; }

/* ---------- 图片 ---------- */

.page-about .about-figure {
  position: relative;
  z-index: 1;
  margin: clamp(24px, 4vw, 36px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  margin-top: clamp(60px, 9vw, 120px);
  padding-top: clamp(48px, 8vw, 96px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__title {
  margin: 0 0 18px;
  max-width: 20ch;
  font-size: clamp(26px, 4.4vw, 46px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--moon);
}

.page-about .about-cta__text {
  margin: 0 0 clamp(26px, 4vw, 40px);
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 17px);
  font-weight: 300;
  line-height: 1.8;
  color: var(--dust);
}

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

/* ---------- 桌面端 ---------- */

@media (min-width: 700px) {
  .page-about .tl {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: var(--about-gap-x);
  }

  .page-about .tl__gutter {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding-top: 6px;
  }

  .page-about .tl__dot {
    top: 9px;
    margin-top: 0;
  }

  .page-about .tl__gutter::before {
    content: "";
    position: absolute;
    top: 24px;
    bottom: calc(-1 * var(--about-gap-y));
    left: 5px;
    width: 1px;
    background: linear-gradient(180deg, rgba(61, 227, 206, 0.34), rgba(27, 36, 56, 0.22));
  }

  .page-about .tl:last-child .tl__gutter::before {
    display: none;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 76px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 26px);
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-toc__list a {
    width: 100%;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    max-width: 14ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__list a,
  .page-about .tl__dot,
  .page-about .tl__year,
  .page-about .tl__note {
    transition: none;
  }
}