/* ============================================================
   品牌概况 /profile/ —— 页面专属样式
   ============================================================ */

.page-about {
  --ab-line: rgba(124, 139, 176, 0.3);
  --ab-line-light: rgba(11, 22, 51, 0.14);
  --ab-panel: rgba(18, 36, 92, 0.62);
  --ab-gap: clamp(26px, 4vw, 48px);
}

/* ---------- 章节导航轨道 ---------- */
.page-about .about-rail:not(:empty) {
  display: none;
}

@media (min-width: 1560px) {
  .page-about .about-rail:not(:empty) {
    display: grid;
    gap: 10px;
    position: fixed;
    top: 50%;
    left: max(16px, calc((100vw - var(--w-max)) / 2 - 118px));
    transform: translateY(-50%);
    width: 100px;
    z-index: 6;
  }
}

/* ---------- 01 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(92px, 12vw, 168px);
  padding-bottom: clamp(48px, 7vw, 96px);
  background:
    radial-gradient(90% 70% at 88% 0%, rgba(0, 230, 118, 0.15), transparent 62%),
    radial-gradient(70% 60% at 0% 100%, rgba(18, 36, 92, 0.9), transparent 72%),
    var(--c-ink-deep);
}

.page-about .about-hero__frame {
  position: relative;
  margin-top: clamp(20px, 3vw, 36px);
  padding: clamp(30px, 4.5vw, 64px) clamp(20px, 4vw, 60px) clamp(26px, 4vw, 52px);
  border: 1px solid var(--c-glass-line);
  border-left: 2px solid var(--c-neon);
  background: var(--c-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow: hidden;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 10px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--c-mist) 0 1px,
    transparent 1px 28px
  );
  opacity: 0.5;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(30px, 5.2vw, 64px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--txt-on-dark);
}

.page-about .about-hero .lead {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.85;
  color: var(--txt-on-dark-dim);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 26px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--ab-line);
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__stats .stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1;
  color: var(--c-neon);
}

.page-about .about-hero__stats .stat__label {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--txt-on-dark-dim);
}

@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 02 品牌起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: var(--ab-gap);
  margin-top: var(--ab-gap);
}

.page-about .about-origin__text p {
  margin: 0 0 1.1em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--txt-on-dark-dim);
}

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

.page-about .about-origin__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-origin__list li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid var(--ab-line);
  border-left: 2px solid var(--c-aqua);
  background: var(--ab-panel);
  font-size: 15px;
  line-height: 1.8;
  color: var(--txt-on-dark-dim);
}

.page-about .about-origin__list li .mono {
  font-weight: 700;
  color: var(--c-aqua);
}

@media (min-width: 960px) {
  .page-about .about-origin__grid {
    grid-template-columns: 1.08fr 0.92fr;
    align-items: start;
  }
}

/* ---------- 03 发展里程碑 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: var(--ab-gap) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(28px, 4vw, 46px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-neon), var(--c-lime) 48%, var(--c-mist));
  opacity: 0.6;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: clamp(30px, 4vw, 48px);
}

.page-about .about-timeline__dot {
  position: absolute;
  left: 1px;
  top: 4px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--c-ink);
  border: 2px solid var(--c-neon);
  box-shadow: 0 0 0 4px rgba(0, 230, 118, 0.12);
}

.page-about .about-timeline__phase {
  margin: 0 0 10px;
  font-size: clamp(14px, 1.7vw, 18px);
  letter-spacing: 0.06em;
  color: var(--c-lime);
}

.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 500;
  line-height: 1.35;
  color: var(--txt-on-dark);
}

.page-about .about-timeline__desc {
  margin: 0;
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--txt-on-dark-dim);
}

.page-about .about-history__figure {
  margin: clamp(32px, 4.5vw, 56px) 0 0;
  max-width: 960px;
}

.page-about .about-history__figure .media-frame img,
.page-about .about-team__figure .media-frame img,
.page-about .about-flow__figure .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 04 采编网络与团队 ---------- */
.page-about .about-team__figure {
  margin: var(--ab-gap) 0 0;
}

.page-about .about-team__cards {
  margin-top: var(--ab-gap);
}

.page-about .about-team__card {
  padding: 26px 22px 28px;
  border-top: 2px solid var(--c-mist);
}

.page-about .about-team__card:nth-child(1) {
  border-top-color: var(--c-neon);
}

.page-about .about-team__card:nth-child(2) {
  border-top-color: var(--c-aqua);
}

.page-about .about-team__card:nth-child(3) {
  border-top-color: var(--c-lime);
}

.page-about .about-team__num {
  margin: 0 0 12px;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--txt-on-dark);
}

.page-about .about-team__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 500;
  color: var(--txt-on-dark);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--txt-on-dark-dim);
}

/* ---------- 05 数据流程 ---------- */
.page-about .about-flow__grid {
  display: grid;
  gap: var(--ab-gap);
  margin-top: var(--ab-gap);
}

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

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

.page-about .about-flow__steps .accordion__item {
  border-bottom: 1px solid var(--ab-line-light);
}

.page-about .about-flow__steps .accordion__item:first-child {
  border-top: 1px solid var(--ab-line-light);
}

.page-about .about-flow__steps .accordion__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 2px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 500;
  color: var(--txt-on-light);
}

.page-about .about-flow__steps .accordion__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-flow__steps .accordion__summary::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--c-neon-deep);
  border-bottom: 1.5px solid var(--c-neon-deep);
  transform: rotate(-45deg);
  transition: transform 0.24s var(--ease-out);
}

.page-about .about-flow__steps .accordion__item[open] .accordion__summary::before {
  transform: rotate(45deg);
}

.page-about .about-flow__steps .accordion__summary:focus-visible {
  outline: 2px solid var(--c-neon-deep);
  outline-offset: 2px;
}

.page-about .about-flow__steps .accordion__body {
  padding: 0 2px 22px 25px;
}

.page-about .about-flow__steps .accordion__body p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--txt-on-light-dim);
}

.page-about .about-flow__io {
  padding-left: 10px;
  border-left: 2px solid var(--c-neon);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--txt-on-light-dim);
}

.page-about .about-flow__diagram {
  display: block;
  width: 100%;
  max-width: 660px;
  height: auto;
  margin-top: clamp(28px, 4vw, 44px);
  overflow: visible;
}

@media (min-width: 1000px) {
  .page-about .about-flow__grid {
    grid-template-columns: 0.92fr 1.08fr;
    align-items: start;
  }
}

/* ---------- 06 合作生态 ---------- */
.page-about .about-eco__statline {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin: var(--ab-gap) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--txt-on-light-dim);
}

.page-about .about-eco__figure {
  font-size: clamp(30px, 4.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--txt-on-light);
}

.page-about .about-eco__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(22px, 3vw, 34px);
  background: var(--ab-line-light);
  border: 1px solid var(--ab-line-light);
}

.page-about .about-eco__item {
  padding: clamp(22px, 3vw, 34px);
  background: var(--c-paper);
}

.page-about .about-eco__item h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--txt-on-light);
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--txt-on-light-dim);
}

.page-about .about-eco__note {
  margin: clamp(24px, 3vw, 36px) 0 0;
  max-width: 76ch;
  padding-left: 18px;
  border-left: 2px solid var(--c-orange);
  font-size: 15px;
  line-height: 1.9;
  color: var(--txt-on-light-dim);
}

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

/* ---------- 07 为什么选择 ---------- */
.page-about .about-why__grid {
  margin-top: var(--ab-gap);
}

.page-about .about-why__item {
  padding-top: 22px;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-why__num {
  margin: 0 0 14px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--c-neon);
}

.page-about .about-why__title {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--txt-on-dark);
}

.page-about .about-why__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--txt-on-dark-dim);
}

.page-about .about-why__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(32px, 4.5vw, 52px);
  padding-top: clamp(24px, 3vw, 34px);
  border-top: 1px solid var(--ab-line);
}

.page-about .about-why__more {
  margin: 22px 0 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--txt-on-dark-dim);
}

.page-about .about-why__more a {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-why__more a:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 3px;
}

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