/* =========================================================
   page-about · 品牌介绍
   ========================================================= */

.page-about {
  --ab-axis: 104px;
}

.page-about .ab-top {
  padding-top: calc(var(--bar-h) + 20px);
}

/* ---------- 通用图注与比例容器 ---------- */
.page-about figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .frame {
  overflow: hidden;
}

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

.page-about .ab-ratio-3x2 { aspect-ratio: 3 / 2; }
.page-about .ab-ratio-2x1 { aspect-ratio: 2 / 1; }
.page-about .ab-ratio-10x7 { aspect-ratio: 10 / 7; }

/* =========================================================
   01 · 首屏
   ========================================================= */
.page-about .ab-hero {
  padding-top: clamp(22px, 3.5vw, 44px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 54px);
  align-items: start;
}

.page-about .ab-kicker {
  display: inline-block;
  margin: 0 0 18px;
  padding: 6px 14px 6px 11px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--gold);
  background: var(--gold-veil);
  border-left: 3px solid var(--gold);
}

.page-about .ab-hero__title {
  margin: 0 0 20px;
  font-size: clamp(32px, 5.4vw, 72px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 15ch;
}

.page-about .ab-hero__lead {
  margin: 0 0 28px;
  max-width: 46ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .ab-hero__side {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-hero__side::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 46%;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--red));
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 18px;
  background: var(--panel);
}

.page-about .ab-stat__num {
  font-family: var(--font-num);
  font-size: clamp(32px, 4.4vw, 46px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .ab-stat__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  line-height: 1.5;
  color: var(--muted);
}

/* =========================================================
   02 · 品牌起点
   ========================================================= */
.page-about .ab-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.6vw, 48px);
  align-items: start;
}

.page-about .ab-origin__copy p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-origin__notes {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-origin__notes li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 14px;
  background: var(--panel);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .ab-origin__notes li span {
  flex: none;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 600;
  color: var(--gold);
}

/* =========================================================
   03 · 版本演进时间轴
   ========================================================= */
.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(22px, 3vw, 34px);
}

.page-about .ab-jump a {
  padding: 6px 16px;
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  transition: color var(--dur-state) var(--ease),
              border-color var(--dur-state) var(--ease),
              background-color var(--dur-state) var(--ease);
}

.page-about .ab-jump a:hover,
.page-about .ab-jump a:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
  background: var(--gold-veil);
}

.page-about .ab-tl__fig {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.page-about .ab-tl {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .ab-tl__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  scroll-margin-top: calc(var(--bar-h) + 36px);
}

.page-about .ab-tl__axis {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .ab-tl__year {
  font-family: var(--font-num);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--gold);
}

.page-about .ab-tl__body {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  transition: border-color var(--dur-state) var(--ease),
              background-color var(--dur-state) var(--ease);
}

.page-about .ab-tl__body:hover {
  border-left-color: var(--gold);
}

.page-about .ab-tl__body h3 {
  margin: 12px 0 10px;
  font-size: clamp(19px, 2vw, 23px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-tl__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-tl__row--now .ab-tl__body {
  background: var(--raise);
  border-left-color: var(--gold);
}

/* =========================================================
   04 · 服务团队
   ========================================================= */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.6vw, 48px);
  align-items: center;
}

.page-about .ab-team__copy p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-met {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .ab-met__item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-left: 16px;
  border-left: 2px solid var(--line);
  transition: border-color var(--dur-state) var(--ease);
}

.page-about .ab-met__item:hover {
  border-left-color: var(--gold);
}

.page-about .ab-met__k {
  flex: none;
  min-width: 92px;
  font-family: var(--font-num);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .ab-met__v {
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--muted);
}

/* =========================================================
   05 · 品质服务三件事（折叠）
   ========================================================= */
.page-about .ab-promise__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .ab-promise .fold {
  background: var(--panel);
  border: 1px solid var(--line);
  transition: border-color var(--dur-state) var(--ease);
}

.page-about .ab-promise .fold:hover {
  border-color: rgba(212, 175, 55, 0.45);
}

.page-about .ab-promise .fold__head {
  width: 100%;
  margin: 0;
  background: none;
  border: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .ab-promise .fold__inner p {
  margin: 0 0 12px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-promise .fold__inner p:last-child {
  margin-bottom: 0;
}

.page-about .ab-promise .fold__inner a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(76, 201, 240, 0.4);
  font-size: 14.5px;
}

.page-about .ab-promise .fold__inner a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* =========================================================
   06 · 服务范围与备案
   ========================================================= */
.page-about .ab-region__box {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-region__aside {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--panel);
  border-top: 3px solid var(--gold);
}

.page-about .ab-region__mark {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .ab-region__icp {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .ab-region__main {
  padding: clamp(22px, 3vw, 34px);
  background: var(--night);
}

.page-about .ab-region__main > p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-contact {
  margin: 22px 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .ab-contact dt {
  margin-bottom: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .ab-contact dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--white);
  word-break: break-word;
}

.page-about .ab-region__note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--red);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* =========================================================
   07 · 协作生态与荣誉
   ========================================================= */
.page-about .ab-honor__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 2.6vw, 32px);
}

.page-about .ab-honor__lead {
  margin: 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  align-items: start;
}

.page-about .ab-honor__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
}

.page-about .ab-honor__card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .ab-honor__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* =========================================================
   08 · 下一步
   ========================================================= */
.page-about .ab-next__box {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding: clamp(24px, 3.4vw, 42px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
}

.page-about .ab-next__box::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(42, 50, 66, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 50, 66, 0.55) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}

.page-about .ab-next__box > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-next__kicker {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-next__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-next__text {
  margin: 0;
  max-width: 44ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

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

/* =========================================================
   断点
   ========================================================= */
@media (min-width: 620px) {
  .page-about .ab-contact {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-contact > div:last-child {
    grid-column: 1 / -1;
  }
}

@media (min-width: 700px) {
  .page-about .ab-honors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-honors > :nth-child(1) { margin-top: 26px; }
  .page-about .ab-honors > :nth-child(3) { margin-top: 54px; }
}

@media (min-width: 820px) {
  .page-about .ab-region__box {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }

  .page-about .ab-next__box {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

  .page-about .ab-origin__fig {
    margin-top: 10px;
  }

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

  .page-about .ab-team__fig {
    margin-bottom: 30px;
  }

  .page-about .ab-honor__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: start;
  }

  .page-about .ab-honor__lead {
    position: sticky;
    top: calc(var(--bar-h) + 32px);
  }

  /* 时间轴 —— 左窄右宽 */
  .page-about .ab-tl {
    gap: clamp(26px, 3.2vw, 42px);
  }

  .page-about .ab-tl::before {
    content: "";
    position: absolute;
    left: calc(var(--ab-axis) - 1px);
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(
      180deg,
      var(--gold) 0%,
      var(--line) 55%,
      rgba(42, 50, 66, 0) 100%
    );
  }

  .page-about .ab-tl__row {
    grid-template-columns: var(--ab-axis) minmax(0, 1fr);
    gap: 0 clamp(24px, 3vw, 44px);
  }

  .page-about .ab-tl__axis {
    flex-direction: column;
    align-items: flex-end;
    justify-content: flex-start;
    gap: 10px;
    padding-right: 30px;
  }

  .page-about .ab-tl__axis::after {
    content: "";
    position: absolute;
    right: -6px;
    top: 8px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--night);
    border: 2px solid var(--gold);
    box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.12);
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero__title {
    max-width: 13ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-jump a,
  .page-about .ab-tl__body,
  .page-about .ab-met__item,
  .page-about .ab-promise .fold {
    transition: none;
  }
}