/* ========================================================================
   美辰信息技术 · 公司简介页样式（扁平版）
   依赖 home-glass.css 的 :root 变量与 .page-bg / .glass-pill / .btn-* / .grad-text
   布局思路：去卡片化 —— 用留白、细分隔线、序号建立层级，而非玻璃面板堆叠
   ======================================================================== */

/* =============== Hero =============== */
.about-hero { padding-top: 84px; padding-bottom: 20px; }
.about-hero__copy {
  display: flex; flex-direction: column; align-items: center; gap: 18px;
  max-width: 820px; margin: 0 auto; text-align: center;
}
.about-hero__title {
  margin: 4px 0 0;
  font-size: 52px; line-height: 1.16; font-weight: 700; letter-spacing: -0.02em;
}
.about-hero__lede {
  margin: 0; max-width: 640px;
  font-size: 16.5px; line-height: 1.8; color: var(--c-text-2);
}

/* =============== 公司简介（左右分栏） =============== */
.about-intro { padding-top: 48px; padding-bottom: 40px; }
.about-intro__grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  column-gap: 56px;
  align-items: start;
  max-width: 1180px;
  margin: 0 auto;
}
/* 左侧栏：粘性标题，滚动时保持可见 */
.about-intro__aside {
  position: sticky; top: 96px;
  display: flex; flex-direction: column; gap: 8px;
}
.about-intro__heading {
  margin: 0;
  font-size: 22px; font-weight: 700; letter-spacing: -0.01em;
}
.about-intro__kicker {
  margin: 0;
  font-family: var(--ff-mono); font-size: 11.5px;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--c-text-4);
}

.about-intro__body { display: flex; flex-direction: column; gap: 30px; }

/* 每段 = 小标题 + 正文，靠留白分组 */
.about-intro__block { display: flex; flex-direction: column; gap: 12px; }
.about-intro__block-title {
  margin: 0;
  font-size: 17px; font-weight: 700; line-height: 1.4;
  letter-spacing: -0.005em; color: var(--c-text-1);
}
/* 标题左侧短竖线，替代序号做视觉锚点 */
.about-intro__block-title::before {
  content: "";
  display: inline-block;
  width: 3px; height: 14px; margin-right: 10px;
  border-radius: 2px;
  background: var(--c-brand-cyan);
  vertical-align: -1px;
}
.about-intro__block-text {
  margin: 0;
  font-size: 15.5px; line-height: 2; color: var(--c-text-2);
}

/* =============== 业务分类（细分隔线列表） =============== */
.biz { padding-top: 40px; padding-bottom: 24px; }
.biz__head {
  display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px 20px;
  max-width: 1180px; margin: 0 auto 8px;
}
.biz__heading { margin: 0; font-size: 30px; font-weight: 700; letter-spacing: -0.01em; }
.biz__lede { margin: 0; font-size: 14.5px; color: var(--c-text-3); }

.biz-list {
  max-width: 1180px; margin: 0 auto;
  display: flex; flex-direction: column;
}
.biz-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 48px;
  align-items: start;
  padding: 28px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
}
.biz-row:last-child { border-bottom: 1px solid rgba(255, 255, 255, 0.09); }

.biz-row__head { display: flex; flex-direction: column; gap: 10px; }
.biz-row__title {
  margin: 0;
  font-size: 20px; font-weight: 700; letter-spacing: -0.005em;
  color: var(--c-text-1);
}
.biz-row__desc {
  margin: 0;
  font-size: 14.5px; line-height: 1.85; color: var(--c-text-2);
}

/* 细分列表：左侧一条竖线 + 逐项小圆点 */
.biz-row__items {
  display: flex; flex-direction: column; gap: 0;
  margin: 0; padding-left: 20px;
  border-left: 1px solid rgba(255, 255, 255, 0.1);
}
.biz-row__items li {
  position: relative;
  padding: 5px 0;
  font-size: 14.5px; line-height: 1.7; color: var(--c-text-1);
}
.biz-row__items li::before {
  content: "";
  position: absolute; top: 14px; left: -24px;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--c-brand-cyan);
}

/* =============== 底部 CTA（无卡片，居中窄栏） =============== */
.about-cta { padding-top: 48px; padding-bottom: 80px; }
.about-cta__inner {
  max-width: 620px; margin: 0 auto;
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  text-align: center;
}
.about-cta__title { margin: 0; font-size: 30px; font-weight: 700; letter-spacing: -0.01em; }
.about-cta__lede {
  margin: 0; font-size: 15px; line-height: 1.8; color: var(--c-text-2);
}
.about-cta__actions {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 6px;
}

/* =============== 响应式 =============== */

/* ≤1280px */
@media (max-width: 1280px) {
  .about-hero { padding-top: 72px; }
  .about-hero__title { font-size: 44px; }
  .about-intro__grid { grid-template-columns: 170px 1fr; column-gap: 40px; }
  .about-intro__block-title { font-size: 16px; }
  .biz-row { column-gap: 36px; }
}

/* ≤960px iPad / Android 横屏：简介改上下堆叠，业务行列改两栏 */
@media (max-width: 960px) {
  .about-hero { padding-top: 64px; }
  .about-hero__title { font-size: 38px; }

  .about-intro { padding-top: 36px; }
  .about-intro__grid { grid-template-columns: 1fr; row-gap: 24px; }
  .about-intro__aside {
    position: static;
    flex-direction: row; align-items: baseline; gap: 12px;
    padding-bottom: 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  .about-intro__heading { font-size: 20px; }

  .biz__heading { font-size: 26px; }
  .biz-row {
    grid-template-columns: 1fr;
    row-gap: 16px;
    padding: 26px 0;
  }
}

/* ≤540px 手机竖屏 */
@media (max-width: 540px) {
  .about-hero { padding-top: 56px; padding-bottom: 12px; }
  .about-hero__copy { gap: 14px; }
  .about-hero__title { font-size: 32px; }
  .about-hero__lede { font-size: 15px; }

  .about-intro { padding-top: 28px; padding-bottom: 24px; }
  .about-intro__grid { row-gap: 18px; }
  .about-intro__block { gap: 10px; }
  .about-intro__block-title { font-size: 15.5px; }
  .about-intro__block-title::before { height: 13px; margin-right: 8px; }
  .about-intro__block-text { font-size: 15px; line-height: 1.95; }

  .biz { padding-top: 28px; }
  .biz__head { gap: 6px; margin-bottom: 12px; }
  .biz__heading { font-size: 22px; }
  .biz__lede { font-size: 13.5px; }
  .biz-row {
    grid-template-columns: 1fr;
    row-gap: 12px;
    padding: 22px 0;
  }
  .biz-row__items { padding-left: 16px; }
  .biz-row__items li { font-size: 14px; }
  .biz-row__items li::before { left: -20px; top: 13px; }
  .biz-row__title { font-size: 18px; }
  .biz-row__desc { font-size: 14px; line-height: 1.8; }

  .about-cta { padding-top: 36px; padding-bottom: 56px; }
  .about-cta__title { font-size: 24px; }
  .about-cta__lede { font-size: 14px; }
  .about-cta__actions { width: 100%; }
  .about-cta__actions .btn-primary--lg,
  .about-cta__actions .btn-ghost--lg { flex: 1 1 auto; justify-content: center; }
}

/* ≤380px iPhone SE */
@media (max-width: 380px) {
  .about-hero__title { font-size: 27px; }
  .about-hero__lede { font-size: 14px; }
  .about-intro__block-title { font-size: 15px; }
  .about-intro__block-text { font-size: 14.5px; }
  .biz__heading { font-size: 20px; }
  .biz-row__title { font-size: 17px; }
  .biz-row__items li { font-size: 13.5px; }
  .about-cta__title { font-size: 21px; }
}

/* 横屏受限（≤960px 横屏且高度 ≤500px） */
@media (orientation: landscape) and (max-height: 500px) {
  .about-hero { padding-top: 40px; padding-bottom: 12px; }
  .about-hero__title { font-size: 30px; }
  .about-hero__lede { font-size: 14px; }
}