/* ==========================================================
   使命愿景页 · page-about
   ========================================================== */

.page-about {
  --ab-gap: clamp(18px, 2.6vw, 30px);
  --ab-panel: rgba(10, 44, 36, .62);
  --ab-panel-2: rgba(18, 61, 51, .55);
  --ab-line: rgba(28, 74, 66, .92);
  --ab-rail-top: 136px;
  min-width: 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.5vw, 56px) 0 clamp(34px, 5.5vw, 76px);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -1px;
  background-image:
    linear-gradient(to right, rgba(28, 74, 66, .5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 74, 66, .5) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(130% 88% at 18% 0%, #000 22%, transparent 74%);
  mask-image: radial-gradient(130% 88% at 18% 0%, #000 22%, transparent 74%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

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

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 4.8vw, 56px);
  line-height: 1.12;
  letter-spacing: -.01em;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  background: var(--ab-line);
  overflow: hidden;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px;
  background: var(--panel);
  min-width: 0;
}

.page-about .about-hero__factnum {
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__factlabel {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-hero__art {
  margin: 0;
  min-width: 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--panel);
}

.page-about .about-hero__art img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__art figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--ab-line);
  background: var(--panel-2);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }
}

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体骨架：左索引 + 右内容流 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  padding-block: clamp(34px, 5vw, 68px) clamp(48px, 7vw, 96px);
}

.page-about .about-rail {
  position: relative;
  min-width: 0;
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-pill);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  white-space: nowrap;
  transition: border-color .18s var(--ease), color .18s var(--ease), transform .18s var(--ease);
}

.page-about .about-rail__item:hover,
.page-about .about-rail__item:focus-visible {
  border-color: var(--orange);
  color: var(--mist);
  transform: translateY(-2px);
}

.page-about .about-rail__num {
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 6vw, 88px);
  min-width: 0;
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: var(--ab-rail-top);
  }
  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-rail__item {
    border-radius: var(--r-sm);
    white-space: normal;
    align-items: flex-start;
    line-height: 1.5;
  }
}

/* ---------- 通用区块 ---------- */

.page-about .about-section {
  min-width: 0;
  scroll-margin-top: 140px;
}

.page-about .section-head h2 {
  margin: 8px 0 0;
  font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 900;
  line-height: 1.24;
  letter-spacing: -.01em;
}

.page-about .section-lede {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.4vw, 16.5px);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 01 时间轴 ---------- */

.page-about .decade-band {
  position: relative;
  margin-top: clamp(22px, 3vw, 36px);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--panel);
}

.page-about .decade-band__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .32;
}

.page-about .decade-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(4, 28, 23, .74) 0%, rgba(4, 28, 23, .9) 58%, var(--ink) 100%);
  pointer-events: none;
}

.page-about .timeline {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: clamp(22px, 3.4vw, 40px) clamp(18px, 3vw, 36px);
  display: grid;
  gap: 2px;
}

.page-about .timeline__item {
  position: relative;
  padding: 16px 0 16px 30px;
  outline-offset: 4px;
  border-radius: var(--r-sm);
  transition: background-color .2s var(--ease);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 24px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 46, .16);
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 9px;
  top: 40px;
  bottom: -2px;
  width: 1px;
  background: linear-gradient(180deg, rgba(25, 230, 192, .62), rgba(25, 230, 192, .1));
}

.page-about .timeline__item:last-child::after {
  bottom: 46%;
  opacity: .55;
}

.page-about .timeline__item:hover,
.page-about .timeline__item:focus-within {
  background: rgba(18, 61, 51, .38);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: clamp(16px, 1.8vw, 20px);
  letter-spacing: .1em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__item h3 {
  margin: 6px 0 0;
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 900;
  line-height: 1.4;
  color: var(--text);
}

.page-about .timeline__item p {
  margin: 10px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .timeline__more {
  padding-left: 12px;
  border-left: 2px solid rgba(255, 122, 46, .5);
  color: rgba(141, 179, 169, .9);
}

@media (min-width: 1024px) and (hover: hover) {
  .page-about .timeline__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding-block: 0;
    margin-top: 0;
    transition: max-height .34s var(--ease), opacity .34s var(--ease), margin-top .34s var(--ease), padding .34s var(--ease);
  }
  .page-about .timeline__item:hover .timeline__more,
  .page-about .timeline__item:focus-within .timeline__more {
    max-height: 220px;
    opacity: 1;
    margin-top: 10px;
    padding-block: 2px;
  }
}

/* ---------- 02 每日工作 ---------- */

.page-about .daily {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-block: 1px solid var(--ab-line);
  background: var(--ab-line);
}

.page-about .daily__row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: clamp(18px, 2.6vw, 28px) clamp(14px, 2.4vw, 24px);
  background: var(--ab-panel);
}

.page-about .daily__num {
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

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

.page-about .daily__body h3 {
  margin: 0;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 900;
  line-height: 1.4;
}

.page-about .daily__body p {
  margin: 10px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

@media (min-width: 860px) {
  .page-about .daily__row {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
}

/* ---------- 03 团队 ---------- */

.page-about .team-visual {
  margin: clamp(22px, 3vw, 34px) 0 0;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--panel);
}

.page-about .team-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .team-visual figcaption {
  padding: 11px 16px;
  border-top: 1px solid var(--ab-line);
  background: var(--panel-2);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .teamcards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
  margin-top: clamp(20px, 2.8vw, 32px);
  align-items: start;
}

.page-about .teamcard {
  min-width: 0;
  border-radius: var(--r-md);
  outline-offset: 3px;
}

.page-about .teamcard__inner {
  display: block;
}

.page-about .teamcard__face {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  background: var(--panel);
}

.page-about .teamcard__face--back {
  margin-top: 10px;
  background: var(--panel-2);
  border-color: rgba(255, 122, 46, .38);
}

.page-about .teamcard__num {
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: clamp(32px, 4.2vw, 44px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .teamcard__label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .teamcard__face p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .teamcards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) and (hover: hover) {
  .page-about .teamcard {
    perspective: 1000px;
  }
  .page-about .teamcard__inner {
    display: grid;
    transform-style: preserve-3d;
    transition: transform .5s var(--ease);
  }
  .page-about .teamcard__face {
    grid-area: 1 / 1;
    min-height: 158px;
    justify-content: center;
  }
  .page-about .teamcard__face--back {
    margin-top: 0;
    backface-visibility: hidden;
    transform: rotateY(180deg);
  }
  .page-about .teamcard__face--front {
    backface-visibility: hidden;
  }
  .page-about .teamcard:hover .teamcard__inner,
  .page-about .teamcard:focus-within .teamcard__inner {
    transform: rotateY(180deg);
  }
}

/* ---------- 04 赛季节奏 ---------- */

.page-about .season-flow {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  background: var(--ab-line);
  overflow: hidden;
}

.page-about .season-flow__step {
  position: relative;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--ab-panel);
  min-width: 0;
}

.page-about .season-flow__step::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 122, 46, 0));
}

.page-about .season-flow__tag {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--amber);
}

.page-about .season-flow__step h3 {
  margin: 10px 0 0;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 900;
  line-height: 1.4;
}

.page-about .season-flow__step p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .track-quote {
  margin: clamp(22px, 3.2vw, 36px) 0 0;
  padding: clamp(18px, 2.6vw, 28px) clamp(18px, 2.6vw, 32px);
  border-left: 4px solid var(--orange);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: linear-gradient(95deg, rgba(255, 122, 46, .12), rgba(25, 230, 192, .05));
}

.page-about .track-quote p {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--text);
}

@media (min-width: 880px) {
  .page-about .season-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 05 技术体验 ---------- */

.page-about .tech-strip {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(12px, 1.8vw, 20px);
}

.page-about .tech-strip__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2vw, 22px);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(11, 34, 48, .7), rgba(10, 44, 36, .55));
  min-width: 0;
}

.page-about .tech-strip__num {
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: clamp(24px, 2.8vw, 34px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .tech-strip__label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .tech-strip__cell p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

@media (min-width: 1100px) {
  .page-about .tech-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 06 合作与认可 ---------- */

.page-about .partner-grid {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--ab-gap);
}

.page-about .partner-card {
  padding: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-lg);
  background: linear-gradient(140deg, rgba(25, 230, 192, .08), rgba(11, 34, 48, .55));
  min-width: 0;
}

.page-about .partner-card__num {
  margin: 0;
  font-family: var(--font-numeric);
  font-weight: 700;
  font-size: clamp(36px, 4.6vw, 54px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.page-about .partner-card h3 {
  margin: 10px 0 0;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 900;
  line-height: 1.4;
}

.page-about .partner-card p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .award-strip {
  margin-top: var(--ab-gap);
  padding: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--ab-line);
  border-left: 4px solid var(--orange);
  border-radius: var(--r-md);
  background: var(--ab-panel-2);
  display: grid;
  gap: 12px;
  justify-items: start;
}

.page-about .award-strip__label {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .award-strip__text {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

@media (min-width: 760px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 07 服务地区 ---------- */

.page-about .region-panel {
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(18px, 2.6vw, 30px);
  border: 1px solid var(--ab-line);
  border-radius: var(--r-lg);
  background: var(--ab-panel);
  display: grid;
  gap: clamp(20px, 2.6vw, 30px);
}

.page-about .region-list {
  margin: 0;
  display: grid;
  gap: 14px;
  min-width: 0;
}

.page-about .region-list > div {
  display: grid;
  gap: 4px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--ab-line);
  min-width: 0;
}

.page-about .region-list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .region-list dt {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .region-list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .region-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

.page-about .about-closing {
  margin: clamp(26px, 3.5vw, 42px) 0 0;
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px solid var(--ab-line);
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-closing a {
  color: var(--mist);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 620px) {
  .page-about .region-list > div {
    grid-template-columns: 108px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 860px) {
  .page-about .region-panel {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .55fr);
    align-items: start;
  }
}

/* ---------- 动效退化 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__item,
  .page-about .timeline__item,
  .page-about .teamcard__inner {
    transition: none;
  }
  .page-about .teamcard__inner {
    display: block;
    transform: none;
  }
  .page-about .teamcard__face {
    grid-area: auto;
    backface-visibility: visible;
    transform: none;
    min-height: 0;
    justify-content: flex-start;
  }
  .page-about .teamcard__face--back {
    margin-top: 10px;
  }
}