/* =========================================================
   品牌概况页 / page-about
   ========================================================= */

.page-about {
  --about-rail: 208px;
  --about-gutter: clamp(40px, 6vw, 84px);
  --about-pad: clamp(36px, 5vw, 76px);
  --about-panel: clamp(26px, 4vw, 48px);
  background: var(--c-sand);
  padding-bottom: var(--space);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(24px, 4vw, 48px);
}

/* ---------- 栏目头 ---------- */
.page-about .about-hero {
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(44px, 7vw, 96px);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 17ch;
  font-family: var(--font-head);
  font-weight: 250;
  font-size: clamp(38px, 7vw, 88px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--c-deep);
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-slate);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
}

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

/* ---------- 侧栏索引 ---------- */
.page-about .about-rail {
  display: grid;
  gap: 22px;
  padding-bottom: clamp(20px, 3vw, 28px);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-slate);
}

.page-about .about-rail__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
}

.page-about .about-rail__list a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 15px;
  color: var(--c-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--c-sea);
  border-bottom-color: var(--c-coral);
}

/* ---------- 版本刻度（窄屏：横向滚动） ---------- */
.page-about .about-scale__list {
  list-style: none;
  display: flex;
  gap: 22px;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
}

.page-about .about-scale__item {
  flex: 0 0 auto;
}

.page-about .about-scale__ver {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-radius: 6px;
  font-family: var(--font-index);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--c-deep);
}

.page-about .about-scale__hint {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0;
  color: var(--c-slate);
}

.page-about .about-scale__item--now .about-scale__ver {
  color: var(--c-coral);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: var(--about-pad);
}

.page-about .about-flow > .about-sec:first-child {
  padding-top: clamp(6px, 2vw, 20px);
}

.page-about .about-sec__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-sec__blob {
  display: block;
  width: 46px;
  height: 30px;
  margin-bottom: 14px;
  background: var(--c-wave);
  border-radius: 62% 38% 48% 52% / 58% 62% 38% 42%;
}

.page-about .about-sec h2 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.24;
  letter-spacing: -0.005em;
  color: var(--c-deep);
}

.page-about .about-sec p {
  margin: 0 0 1.1em;
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-deep);
}

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

.page-about .about-flow a {
  color: var(--c-sea);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line-sea);
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-flow a:hover,
.page-about .about-flow a:focus-visible {
  color: var(--c-coral-deep);
  border-bottom-color: var(--c-coral);
}

/* ---------- 阶段 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: clamp(16px, 3vw, 28px) 0 0;
  padding: 0;
  max-width: 68ch;
}

.page-about .about-stages li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  padding: 14px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-stages li:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-stages strong {
  font-family: var(--font-index);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-sea);
}

.page-about .about-stages span {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-slate);
}

/* ---------- 三步 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0;
  padding: 0;
  max-width: 68ch;
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  align-items: baseline;
  gap: 0 12px;
  padding: 16px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-steps li:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-steps__n {
  font-family: var(--font-index);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-coral);
}

.page-about .about-steps__text {
  display: block;
  font-size: 17px;
  line-height: 1.7;
  color: var(--c-deep);
}

/* ---------- 节奏时间轴 ---------- */
.page-about .about-rhythm {
  list-style: none;
  position: relative;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 4px 0 4px 28px;
  max-width: 68ch;
}

.page-about .about-rhythm::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--c-sea);
  opacity: 0.35;
}

.page-about .about-rhythm li {
  position: relative;
  padding-bottom: clamp(20px, 3vw, 30px);
}

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

.page-about .about-rhythm li::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 0.5em;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--c-paper);
  border: 2px solid var(--c-sea);
}

.page-about .about-rhythm__when {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-index);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-sea-deep);
}

.page-about .about-rhythm__text {
  display: block;
  font-size: 16px;
  line-height: 1.72;
  color: var(--c-deep);
}

/* ---------- 状态分布 ---------- */
.page-about .about-status {
  margin-top: clamp(22px, 3.5vw, 34px);
}

.page-about .about-status__lead {
  margin: 0 0 14px;
}

.page-about .about-status__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  margin: 0;
  padding: 0;
}

.page-about .about-status__list li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-status__num {
  font-family: var(--font-index);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--c-deep);
}

/* ---------- 版本大数字 ---------- */
.page-about .about-figs {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: clamp(22px, 4vw, 56px);
  margin: clamp(26px, 4vw, 40px) 0;
  padding: clamp(18px, 3vw, 26px) 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-fig {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fig__num {
  font-family: var(--font-index);
  font-weight: 700;
  font-size: clamp(48px, 9vw, 92px);
  line-height: 0.92;
  letter-spacing: 0.01em;
  color: var(--c-sea);
}

.page-about .about-fig__unit {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-slate);
}

.page-about .about-fig--ver .about-fig__num {
  font-size: clamp(28px, 4.6vw, 48px);
  color: var(--c-coral);
}

/* ---------- 机型分组 ---------- */
.page-about .about-groups {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  max-width: 68ch;
}

.page-about .about-groups li {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0 14px;
  padding: 15px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-groups li:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-groups__idx {
  padding-top: 3px;
  font-family: var(--font-index);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-sea);
}

.page-about .about-groups__body strong {
  display: block;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--c-deep);
}

.page-about .about-groups__note {
  display: block;
  margin-top: 4px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--c-slate);
}

/* ---------- 图片 ---------- */
.page-about .media-figure {
  margin: clamp(28px, 4.5vw, 56px) 0;
}

.page-about .media-figure .media {
  overflow: hidden;
  border-radius: var(--radius-soft);
}

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

.page-about .media-figure .media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-slate);
}

/* ---------- 浅浪青色块 ---------- */
.page-about .about-sec--wave {
  margin-block: clamp(24px, 4vw, 48px);
  padding: var(--about-panel);
  background: var(--c-wave);
  border-radius: var(--radius-soft);
}

/* ---------- 深海墨蓝色块 ---------- */
.page-about .about-sec--deep {
  margin-top: clamp(24px, 4vw, 48px);
  padding: var(--about-panel);
  background: var(--c-deep);
  border-radius: var(--radius-soft);
}

.page-about .about-sec--deep .about-sec__blob {
  background: rgba(217, 239, 242, 0.3);
}

.page-about .about-sec--deep h2 {
  color: var(--c-sand);
}

.page-about .about-sec--deep p {
  color: rgba(248, 244, 234, 0.82);
}

.page-about .about-flow .about-sec--deep a {
  color: var(--c-coral);
  border-bottom-color: rgba(255, 106, 77, 0.5);
}

.page-about .about-flow .about-sec--deep a:hover,
.page-about .about-flow .about-sec--deep a:focus-visible {
  color: var(--c-sand);
  border-bottom-color: var(--c-sand);
}

.page-about .about-contact {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  max-width: 68ch;
}

.page-about .about-contact li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
}

.page-about .about-contact__k {
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-mint);
}

.page-about .about-contact__v {
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-sand);
  overflow-wrap: anywhere;
}

.page-about .about-sec--deep .about-note {
  margin-top: clamp(18px, 3vw, 26px);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(248, 244, 234, 0.62);
}

/* =========================================================
   桌面：栏栅式长文
   ========================================================= */
@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gutter);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: clamp(80px, 12vh, 120px);
    gap: 34px;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 10px;
  }

  .page-about .about-scale__list {
    position: relative;
    flex-direction: column;
    gap: 15px;
    overflow: visible;
    padding: 6px 0 6px 18px;
  }

  .page-about .about-scale__list::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 12px;
    bottom: 12px;
    width: 2px;
    background: var(--c-line-sea);
  }

  .page-about .about-scale__item {
    position: relative;
  }

  .page-about .about-scale__item::before {
    content: "";
    position: absolute;
    left: -18px;
    top: 0.42em;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--c-sea);
  }

  .page-about .about-scale__item--now::before {
    background: var(--c-coral);
  }

  .page-about .about-scale__ver {
    position: relative;
    cursor: default;
  }

  .page-about .about-scale__hint {
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%);
    white-space: nowrap;
    padding: 4px 10px;
    border-radius: var(--radius-pill);
    background: var(--c-deep);
    color: var(--c-sand);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.16s var(--ease);
  }

  .page-about .about-scale__ver:hover .about-scale__hint,
  .page-about .about-scale__ver:focus-visible .about-scale__hint {
    opacity: 1;
    visibility: visible;
  }

  .page-about .about-stages li {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: 0 18px;
  }

  .page-about .about-contact li {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    align-items: baseline;
    gap: 0 18px;
  }
}

/* =========================================================
   降低动态效果
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .about-flow a,
  .page-about .about-scale__hint {
    transition: none;
  }
}