/* ==========================================================================
   pages/about.css — 关于我们（品牌叙事型 About Page · 六章重排版）
   --------------------------------------------------------------------------
   六个章节：公司理念 / 产品观 / 技术观 / 服务观 / 业务方向 / 愿景
   共享效果组件（.glow-field / .spot-card / .outline-word）见 css/blocks.css 第 8 节
   ========================================================================== */

.page--about {
  background: var(--c-bg);
}

/* ------------------------------------------------------------ 章节骨架 */
.story {
  padding-bottom: clamp(24px, 4vw, 48px);
}

.story-chapter {
  position: relative;
  padding-block: clamp(64px, 8vw, 128px);
  border-top: 1px solid var(--c-line-soft);
  /* 用 clip 而不是 hidden：hidden 会创建滚动容器，破坏左侧编号栏的 sticky */
  overflow: hidden;
  overflow: clip;
}

.story-chapter:first-child {
  border-top: 0;
}

.story-chapter__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: clamp(32px, 6vw, 104px);
  align-items: start;
}

/* 章节索引栏：顶部橙色短线 + 大号编号 + 章节名 + 渐隐竖线 */
.story-chapter__aside {
  position: sticky;
  top: 132px;
  padding-top: 26px;
  border-top: 1px solid var(--c-line);
}

.story-chapter__aside::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  width: 72px;
  height: 2px;
  background: var(--c-accent);
}

.story-chapter__num {
  display: block;
  color: var(--c-accent);
  font-size: clamp(42px, 4.6vw, 68px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.story-chapter__kicker {
  margin-top: 16px;
  color: var(--c-ink);
  font-size: clamp(15px, 1.15vw, 19px);
  line-height: 1.5;
  letter-spacing: 0.2em;
}

/* 编号下方的渐隐竖线，把索引栏「立」起来 */
.story-chapter__aside::after {
  content: '';
  display: block;
  width: 1px;
  height: clamp(40px, 5vw, 72px);
  margin-top: 22px;
  background: linear-gradient(180deg, var(--c-line-strong), transparent);
}

.story-chapter__main {
  max-width: 1000px;
}

.story-chapter__title {
  margin: 0 0 clamp(24px, 3vw, 40px);
  max-width: 760px;
}

/* 正文（直接子级段落） */
.story-chapter__main > p {
  max-width: 720px;
  color: var(--c-body);
  font-size: var(--fs-lead);
  line-height: 1.95;
  letter-spacing: var(--ls-body);
}

.story-chapter__main > p + p,
.story-chapter__main > * + p {
  margin-top: 20px;
}

/* 双栏正文 */
.story-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 64px);
  max-width: 980px;
}

.story-cols p {
  color: var(--c-body);
  font-size: var(--fs-lead);
  line-height: 1.95;
  letter-spacing: var(--ls-body);
}

/* 章节收束句 */
.story-closing {
  margin-top: clamp(28px, 3.4vw, 44px);
  max-width: 720px;
  color: var(--c-muted);
  font-size: var(--fs-lead);
  line-height: 1.9;
  letter-spacing: var(--ls-body);
}

/* ------------------------------------------------------ 巨型大字陈述块 */
.story-display {
  margin: clamp(36px, 4.6vw, 64px) 0 0;
  padding: clamp(28px, 3.6vw, 52px) 0;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.story-display p {
  color: var(--c-ink);
  font-size: clamp(30px, 4vw, 58px);
  font-weight: 500;
  line-height: 1.24;
  letter-spacing: -0.01em;
}

/* ------------------------------------------------------ 三步流程（横排） */
.story-steps {
  position: relative;
  margin: clamp(32px, 4vw, 56px) 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 1000px;
}

/* 贯穿三步的发丝线（只在卡片之间的空隙露出） */
.story-steps::before {
  content: '';
  position: absolute;
  top: 46px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--c-line);
}

.story-step {
  position: relative;
  z-index: 1;
  padding: 26px 28px 30px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: var(--c-panel);
}

.story-step__num {
  color: var(--c-accent);
  font-size: var(--fs-label);
  letter-spacing: 0.2em;
}

.story-step p {
  margin-top: 42px;
  color: var(--c-ink);
  font-size: var(--fs-lead);
  line-height: 1.7;
}

/* ---------------------------------------------------------- 引言 / 强调句 */
.story-quote {
  margin: clamp(32px, 4vw, 56px) 0 0;
  padding-left: clamp(20px, 2.6vw, 34px);
  border-left: 2px solid var(--c-accent);
  max-width: 820px;
}

.story-quote p {
  color: var(--c-ink);
  font-size: var(--fs-h4);
  line-height: var(--lh-h4);
  letter-spacing: var(--ls-h4);
  font-weight: 500;
}

.story-callout {
  margin: clamp(28px, 3.4vw, 48px) 0 0;
  padding: 18px 0 18px clamp(20px, 2.6vw, 32px);
  border-left: 2px solid var(--c-line-strong);
  max-width: 780px;
  color: var(--c-ink);
  font-size: var(--fs-h5);
  line-height: 1.7;
  letter-spacing: var(--ls-h5);
}

.story-callout--accent {
  border-left-color: var(--c-accent);
  color: var(--c-accent-deep);
}

/* -------------------------------------------------- 左右对照 / 四格卡片 */
.story-split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(32px, 5vw, 80px);
  max-width: 1000px;
}

.story-split__aside p {
  color: var(--c-ink);
  font-size: var(--fs-h3);
  line-height: var(--lh-h3);
  letter-spacing: var(--ls-h3);
}

.story-split__body > * + * {
  margin-top: 20px;
}

.story-split__body p {
  color: var(--c-body);
  font-size: var(--fs-lead);
  line-height: 1.95;
  letter-spacing: var(--ls-body);
}

.story-grid2 {
  margin: clamp(28px, 3.4vw, 48px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  max-width: 980px;
}

.story-grid2 > li {
  padding: 26px 28px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: rgba(248, 248, 248, 0.03);
  color: var(--c-ink);
  font-size: var(--fs-lead);
  line-height: 1.65;
  letter-spacing: var(--ls-body);
}

/* ------------------------------------------------------------ 三原则卡 */
.story-principles {
  margin-top: clamp(28px, 3.4vw, 48px);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 1000px;
}

.story-principle {
  padding: 28px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: rgba(248, 248, 248, 0.03);
}

.story-principle h3 {
  margin-bottom: 12px;
  font-size: var(--fs-h5);
}

.story-principle p {
  color: var(--c-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
}

/* ------------------------------------------------------------ 业务方向 */
.story-feature {
  position: relative;
  margin-top: clamp(28px, 3.4vw, 48px);
  padding: clamp(28px, 3.6vw, 48px);
  border: 1px solid rgb(var(--c-accent-rgb) / 0.35);
  border-radius: var(--r-xl);
  background: rgb(var(--c-accent-rgb) / 0.06);
  overflow: clip;
  max-width: 900px;
}

.story-feature__label {
  color: var(--c-accent);
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
}

.story-feature__name {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 12px;
  font-size: var(--fs-h3);
}

/* TREAP 用白色 Logo 代替英文文字 */
.story-feature__logo {
  height: 0.82em;
  width: auto;
  filter: brightness(0) invert(1);
}

.story-feature p {
  margin-top: 16px;
  max-width: 640px;
  color: var(--c-body);
  font-size: var(--fs-lead);
  line-height: 1.85;
  letter-spacing: var(--ls-body);
}

.story-upcoming {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 900px;
}

.story-upcoming li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
}

.story-upcoming b {
  color: var(--c-ink);
  font-size: var(--fs-lead);
  font-weight: 600;
}

.story-upcoming span {
  color: var(--c-muted);
  font-size: var(--fs-label);
  letter-spacing: 0.12em;
}

/* ------------------------------------------------------------ 子标题 */
.story-subtitle {
  margin: clamp(48px, 5vw, 80px) 0 20px;
  padding-top: clamp(32px, 4vw, 56px);
  border-top: 1px solid var(--c-line);
  font-size: var(--fs-h3);
}

/* -------------------------------------------------------- 愿景大字 + 收束面板 */
.story-vision {
  margin: 24px 0 0;
  max-width: 900px;
  color: var(--c-ink);
  font-size: clamp(30px, 3.6vw, 52px);
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.story-panel {
  position: relative;
  margin-top: clamp(40px, 5vw, 72px);
  padding: clamp(32px, 4.6vw, 64px);
  border: 1px solid rgb(var(--c-accent-rgb) / 0.3);
  border-radius: var(--r-2xl);
  background: rgb(var(--c-accent-rgb) / 0.05);
  overflow: clip;
  max-width: 980px;
}

.story-panel__motto {
  color: var(--c-accent);
  font-size: clamp(28px, 3.4vw, 48px);
  line-height: 1.3;
}

.story-panel__note {
  margin-top: 20px;
  max-width: 640px;
  color: var(--c-body);
  font-size: var(--fs-lead);
  line-height: 1.9;
  letter-spacing: var(--ls-body);
}

/* ------------------------------------------------------------ 公司信息 */
.about-info {
  padding-block: clamp(64px, 8vw, 120px);
  border-top: 1px solid var(--c-line-soft);
}

.about-info__list {
  margin: 40px 0 0;
  border-top: 1px solid var(--c-line);
}

.about-info__row {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--c-line);
}

.about-info__row dt {
  color: var(--c-muted);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: var(--ls-body);
}

.about-info__row dd {
  margin: 0;
  color: var(--c-ink);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: var(--ls-body);
}

.about-info__row a {
  color: var(--c-accent);
}

/* ------------------------------------------------------ 章节描边水印位置 */
.story-outline {
  right: -2%;
  top: clamp(12px, 2.4vw, 40px);
  font-size: clamp(120px, 17vw, 280px);
  -webkit-text-stroke-color: rgba(255, 255, 255, 0.12);
}

/* -------------------------------------------------------------- 响应式 */
@media (max-width: 980px) {
  .story-cols,
  .story-split,
  .story-grid2 {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .story-steps,
  .story-principles,
  .story-upcoming {
    grid-template-columns: 1fr;
  }

  .story-steps::before {
    display: none;
  }

  .story-step p {
    margin-top: 18px;
  }
}

@media (max-width: 900px) {
  .story-chapter {
    padding-block: 64px;
  }

  .story-chapter__grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .story-chapter__aside {
    position: static;
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding-top: 20px;
  }

  .story-chapter__num {
    font-size: 30px;
  }

  .story-chapter__kicker {
    margin-top: 0;
    font-size: 15px;
  }

  .story-chapter__aside::after {
    display: none;
  }

  .about-info__row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}