/* ============================================================
   page-about · 品牌愿景
   ============================================================ */

.page-about {
  --about-jade-soft: rgba(63, 191, 175, 0.14);
  --about-gold-soft: rgba(217, 168, 74, 0.16);
  --about-cinnabar-soft: rgba(200, 64, 47, 0.14);
  position: relative;
  padding-bottom: clamp(56px, 9vw, 110px);
  overflow-x: clip;
}

.page-about > .section {
  padding-top: clamp(48px, 7vw, 88px);
}

.page-about .about-head {
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

.page-about .about-head .section-head__index {
  color: var(--gold);
  font-family: var(--font-mono);
  letter-spacing: 0.16em;
}

/* ---------------- 首屏 ---------------- */

.page-about .about-hero {
  position: relative;
  padding-top: clamp(20px, 3vw, 34px);
  padding-bottom: clamp(44px, 6.5vw, 82px);
  border-bottom: 1px solid var(--rule);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(42, 60, 90, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 60, 90, 0.42) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 88%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 88%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 42px);
  margin-top: clamp(22px, 3.4vw, 40px);
}

.page-about .about-kicker {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cinnabar-lit);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 5.4vw, 50px);
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--paper);
  margin: 0 0 20px;
  max-width: 18em;
}

.page-about .about-hero__lede {
  max-width: 40em;
  margin: 0;
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__panel {
  position: relative;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--jade);
  background:
    linear-gradient(160deg, rgba(63, 191, 175, 0.09), transparent 62%),
    var(--ink-panel);
  padding: clamp(20px, 3vw, 30px);
  box-shadow: var(--shadow-brut);
}

.page-about .about-hero__rings {
  position: relative;
  height: 148px;
  overflow: hidden;
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-ring {
  position: absolute;
  left: 50%;
  bottom: -68px;
  transform: translateX(-50%);
  border-radius: 50%;
  border: 1px solid var(--rule);
}

.page-about .about-ring--1 {
  width: 190px;
  height: 190px;
  border-color: var(--jade);
}

.page-about .about-ring--2 {
  width: 270px;
  height: 270px;
}

.page-about .about-ring--3 {
  width: 350px;
  height: 350px;
  border-color: rgba(217, 168, 74, 0.5);
}

.page-about .about-ring--4 {
  width: 430px;
  height: 430px;
}

.page-about .about-hero__meta {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__meta-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 9px;
  border-bottom: 1px dashed rgba(42, 60, 90, 0.9);
  font-size: 14px;
}

.page-about .about-hero__meta-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-hero__meta-row dt {
  color: var(--muted);
}

.page-about .about-hero__meta-row dd {
  margin: 0;
  color: var(--paper);
  text-align: right;
}

/* ---------------- 起点 ---------------- */

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 40px);
}

.page-about .about-origin__body p {
  margin: 0 0 18px;
  max-width: 40em;
  font-size: 16px;
  color: var(--paper);
}

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

.page-about .about-origin__plates {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  align-content: start;
}

.page-about .about-origin__plate {
  border-left: 3px solid var(--gold);
}

/* ---------------- 发展历程 ---------------- */

.page-about .about-timeline__figure {
  margin: 0 0 clamp(32px, 4.6vw, 56px);
}

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

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 30px;
  width: 1px;
  background: linear-gradient(
    180deg,
    var(--jade) 0%,
    var(--rule) 26%,
    var(--rule) 72%,
    var(--gold) 100%
  );
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: clamp(26px, 3.6vw, 42px);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  box-sizing: border-box;
  background: var(--ink);
  border: 2px solid var(--jade);
  box-shadow: 0 0 0 4px var(--about-jade-soft);
}

.page-about .about-timeline__item:last-child::before {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px var(--about-gold-soft);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  border: 1px solid rgba(217, 168, 74, 0.42);
  padding: 3px 10px;
  border-radius: 2px;
  margin-bottom: 12px;
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  line-height: 1.5;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .about-timeline__content p {
  margin: 0 0 12px;
  max-width: 44em;
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-timeline__more {
  margin-top: 4px;
}

.page-about .about-timeline__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--jade);
  padding: 6px 0;
  border-bottom: 1px dashed rgba(63, 191, 175, 0.42);
}

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

.page-about .about-timeline__more summary::before {
  content: "+";
  font-size: 15px;
  line-height: 1;
}

.page-about .about-timeline__more[open] summary::before {
  content: "\2013";
}

.page-about .about-timeline__more p {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--about-jade-soft);
  font-size: 14px;
  color: var(--paper);
  opacity: 0.86;
}

/* ---------------- 双端并行 ---------------- */

.page-about .about-dual__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.2vw, 38px);
  align-items: start;
}

.page-about .about-dual__panes {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-dual__pane {
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--jade);
  background:
    linear-gradient(150deg, rgba(63, 191, 175, 0.08), transparent 70%),
    var(--ink-panel);
}

.page-about .about-dual__pane--desktop {
  background: var(--panel-light);
  border-color: rgba(14, 23, 38, 0.18);
  border-top-color: var(--ink);
  color: var(--ink);
}

.page-about .about-dual__pane-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--jade);
}

.page-about .about-dual__pane--desktop .about-dual__pane-tag {
  color: var(--cinnabar);
}

.page-about .about-dual__pane h3 {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.5;
  margin: 0 0 10px;
  color: var(--paper);
}

.page-about .about-dual__pane--desktop h3 {
  color: var(--ink);
}

.page-about .about-dual__pane p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-dual__pane--desktop p {
  color: rgba(14, 23, 38, 0.72);
}

.page-about .about-dual__figure {
  margin: 0;
}

.page-about .about-dual__sync {
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: clamp(16px, 2.2vw, 24px) clamp(18px, 2.6vw, 28px);
  max-width: 54em;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--gold);
  background: rgba(217, 168, 74, 0.06);
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}

/* ---------------- 团队与服务 ---------------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.2vw, 38px);
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__stats {
  list-style: none;
  margin: 0 0 clamp(20px, 2.8vw, 30px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .about-stat {
  background: var(--ink-panel);
  padding: clamp(16px, 2.2vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--cinnabar-lit);
}

.page-about .about-stat__num--time {
  font-size: clamp(19px, 2.6vw, 26px);
}

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

.page-about .about-team__panel p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------------- 服务地区与站点信息 ---------------- */

.page-about .about-region__box {
  position: relative;
  border: 1px solid var(--rule);
  background:
    linear-gradient(200deg, rgba(30, 111, 106, 0.18), transparent 58%),
    var(--ink-panel);
  padding: clamp(22px, 3.4vw, 44px);
}

.page-about .about-region__box::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 96px;
  height: 96px;
  background-image:
    linear-gradient(to right, rgba(42, 60, 90, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 60, 90, 0.6) 1px, transparent 1px);
  background-size: 16px 16px;
  pointer-events: none;
}

.page-about .about-region__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.2vw, 40px);
}

.page-about .about-region__col h3 {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.5;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .about-region__col p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .about-region__facts {
  margin: 0;
  display: grid;
  border-top: 1px solid var(--rule);
}

.page-about .about-region__facts > div {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 11px 0;
  border-bottom: 1px solid rgba(42, 60, 90, 0.55);
  font-size: 14px;
}

.page-about .about-region__facts dt {
  color: var(--muted);
}

.page-about .about-region__facts dd {
  margin: 0;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .about-region__facts .mono {
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ---------------- 内容与合作 ---------------- */

.page-about .about-content__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 40px);
  align-items: start;
}

.page-about .about-content__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-content__list > li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: clamp(16px, 2.2vw, 22px) 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-content__list-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .about-content__list h4 {
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.5;
  margin: 0 0 7px;
  color: var(--paper);
}

.page-about .about-content__list p {
  margin: 0;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-content__link {
  color: var(--jade);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 191, 175, 0.45);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-content__link:hover,
.page-about .about-content__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.page-about .about-content__side {
  border: 1px solid var(--rule);
  border-top: 3px solid var(--cinnabar);
  background: var(--ink-panel);
  padding: clamp(20px, 3vw, 30px);
  box-shadow: var(--shadow-brut);
}

.page-about .about-content__side-eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cinnabar-lit);
}

.page-about .about-content__side h3 {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.45;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .about-content__side p {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------------- 响应式 ---------------- */

@media (max-width: 599px) {
  .page-about .about-hero__acts .btn {
    width: 100%;
    text-align: center;
  }

  .page-about .about-hero__meta-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-about .about-hero__meta-row dd {
    text-align: left;
  }
}

@media (min-width: 560px) {
  .page-about .about-region__facts > div {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 12px;
    align-items: baseline;
  }
}

@media (min-width: 640px) {
  .page-about .about-dual__panes {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 860px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

@media (min-width: 880px) {
  .page-about .about-timeline__list::before {
    left: 22px;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 0 clamp(18px, 2.6vw, 32px);
    padding-left: 46px;
  }

  .page-about .about-timeline__item::before {
    left: 15px;
    top: 8px;
  }

  .page-about .about-timeline__year {
    justify-self: start;
    margin-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(30px, 4vw, 56px);
    align-items: stretch;
  }

  .page-about .about-dual__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: clamp(28px, 3.6vw, 44px);
  }

  .page-about .about-content__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 52px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-content__link {
    transition: none;
  }
}