/* 关于湛腾页 · 补充样式（需配合 main.css）
   主视觉宽度与首页一致：>1600→1360 / 1401–1600→1200 / 1025–1400→1000 */

.about-hero {
  padding-top: var(--header-h);
  background: linear-gradient(96deg, #1b4171 0%, #556e96 97.6%);
  overflow: hidden;
}

.about-hero-inner {
  display: grid;
  /* 1360 稿面：图 731 + 间距 40 + 文案区 589 */
  grid-template-columns: minmax(0, 731fr) minmax(0, 589fr);
  gap: clamp(40px,40px, 40px);
  align-items: start;
}

.about-hero-image {
  display: block;
  width: 100%;
  max-width: 731px;
  height: auto;
  align-self: end;
  object-fit: contain;
  object-position: left bottom;
}

/* 主视觉 · 1360 内容区（>1600 视口）：图 731 + 间距 40 + 文案 589 */
@media (min-width: 1601px) {
  .about-hero-inner {
    grid-template-columns: 731px minmax(0, 589px);
    gap: 40px;
  }

  .about-hero-image {
    width: 731px;
    max-width: 731px;
  }
}

.about-hero-stats { color: #fff; padding-top: 77px;padding-bottom:77px; }

.about-hero-tagline {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
}

/* 标题下渐变彩带 · 稿面 Rectangle 54：120×2px */
.about-hero-ribbon {
  width: 120px;
  height: 2px;
  margin-bottom: 30px;
  border-radius: 1px;
  background: linear-gradient(90deg, #0074f1 0%, #00d0ff 51.92%, rgba(0, 208, 255, 0) 99.04%);
  box-shadow: 0 0 16px rgba(0, 208, 255, 0.35);
}

.about-hero-tagline .num {
  font-family: var(--font-num);
  font-size: 60px;
  font-weight: 500;
  letter-spacing: -1.8px;
  color: #2dc4ff;
  line-height: 1;
}

.about-hero-tagline .text {
  font-size: 48px;
  font-weight: 600;
  letter-spacing: -1.44px;
  line-height: 1;
}

.about-hero-subtitle {
  font-size: 24px;
  letter-spacing: -0.72px;
  margin-bottom: 60px;
  max-width: 420px;
}

.about-hero-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px clamp(24px, 4.4vw, 60px);
  max-width: 382px;
}

.metric-item:nth-of-type(odd) {
  border-right: 1px solid rgba(255, 255, 255, 0.2);
}

.metric-item:nth-of-type(even) {
  border-right: none;
}
.metric-item .label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 8px;
}

.metric-item .value {
  display: flex;
  align-items: center;
  font-family: var(--font-num);
  font-size: 44px;
  font-weight: 500;
  letter-spacing: -2.2px;
  line-height: 1;
}

.metric-item .value-plus {
  font-family: var(--font-sans);
  font-size: 32px;
  font-weight: 300;
  letter-spacing: 0;
  margin-left:4px;
}

.about-intro {
  padding: 60px 0 90px;
  background: #fff;
}

.about-intro .section-head { margin-bottom: 32px; }

.about-intro-text {
  text-align: center;
}

.about-intro-text p {
  font-size: 16px;
  font-weight: 400;
  line-height: 28px;
  color: #333333;
  padding:0 80px;
  margin: 0 auto;
}

.about-intro-text p strong {
  font-size:24px;
  color:#0053A6;
  margin-bottom:16px;
  display:block;
  font-weight: 600;
}

.about-intro-text p + p { margin-top: 60px; }

.milestones {
  padding: 80px 0 100px;
  background: var(--grad-section);
  overflow: visible;
}

.milestones .container {
  overflow: visible;
}

.milestones .section-head { margin-bottom: 48px; }

.milestone-grid {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 56px;
  overflow: visible;
}

.milestone-track {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
  z-index: 0;
}

.milestone-track-path {
  fill: none;
  stroke: #dfe5ef;
  stroke-width: clamp(4px, 0.55vw, 6px);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.milestone-row {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.milestone-row--reverse {
  direction: rtl;
}

.milestone-row--reverse .milestone-item {
  direction: ltr;
}

.milestone-item {
  position: relative;
  z-index: 1;
  padding-top: 56px;
  text-align: center;
}

.milestone-item .node-icon {
  position: absolute;
  top: 0;
  left: 50%;
  z-index: 2;
  transform: translateX(-50%);
  width: 44px;
  height: 44px;
  display: block;
}

/* 首尾延伸至视口左右边缘，与 milestone-track 拼接 */
.milestone-item--lead::before,
.milestone-item--tail::after {
  content: "";
  position: absolute;
  top: var(--milestone-track-y, 19px);
  height: clamp(4px, 0.55vw, 6px);
  background: #dfe5ef;
  z-index: 0;
  pointer-events: none;
}

.milestone-item--lead::before {
  left: var(--milestone-cap-offset, 0);
  width: var(--milestone-ext-left, 0);
}

.milestone-item--tail::after {
  left: var(--milestone-cap-offset, 0);
  width: var(--milestone-ext-right, 0);
}

.milestone-year {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 12px;
  font-family: var(--font-num);
}

.milestone-desc {
  font-size: 14px;
  line-height: 21px;
  color: #546277;
  max-width: 260px;
  margin: 0 auto;
}

.culture {
  padding: 100px 0;
  background: #fff;
}

.culture-layout {
  display: grid;
  /* 1360 稿面：4×325 + 3×20 间距 */
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.culture-aside {
  background: var(--c-blue-mid);
  padding: 48px 32px;
  min-height: 574px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.culture-eyebrow {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 2.4px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 6px;
}

.culture-title {
  font-size: 48px;
  font-weight: 600;
  color: #fff;
}

.culture-title::after {
  content: "";
  display: block;
  width: 100px;
  height: 2px;
  margin: 12px auto 0;
  background: var(--grad-line);
}

.culture-grid { display: contents; }

.culture-card {
  background: #f5f5f5;
  display: flex;
  flex-direction: column;
  min-height: 574px;
}

.culture-watermark {  
  font-size: 48px;
  font-weight: 400;
  color: rgba(27, 65, 113, 0.4);
  padding: 40px 40px 30px;
  line-height: 1;
}

.culture-mission{
  padding:0 40px;
  line-height:24px;
  font-size: 16px;
  color: #000;
}

.culture-mission-item{
  margin-bottom: 16px;
}

.culture-card p {
  font-size: 16px;
  line-height: 28px;
  color: #000;
  padding: 0 40px 24px;
  flex: 1;
}

.culture-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  margin-top: auto;
}

/* 主视觉 · 1201–1400 内容区 */
@media (max-width: 1400px) and (min-width: 1201px) {
  .about-hero-inner {
    gap: clamp(15px, 20px, 20px);
    padding-top: 40px;
  }

  .about-hero-stats {
    padding-top: 48px;
    padding-bottom: 64px;
  }

  .about-hero-tagline { margin-bottom: 26px; }

  .about-hero-tagline .num {
    font-size: 52px;
    letter-spacing: -1.56px;
  }

  .about-hero-tagline .text {
    font-size: 40px;
    letter-spacing: -1.2px;
  }

  .about-hero-ribbon {
    width: 108px;
    margin-bottom: 26px;
  }

  .about-hero-subtitle {
    font-size: 22px;
    letter-spacing: -0.66px;
    margin-bottom: 48px;
    max-width: 400px;
  }

  .about-hero-metrics {
    gap: 18px clamp(20px, 3.5vw, 48px);
    max-width: 360px;
  }

  .metric-item .label { font-size: 13px; }

  .metric-item .value {
    font-size: 38px;
    letter-spacing: -1.9px;
  }

  .about-intro {
    padding: 56px 0 80px;
  }

  .about-intro .section-head { margin-bottom: 28px; }

  .about-intro-text p {
    padding: 0 clamp(40px, 5vw, 64px);
  }

  .about-intro-text p + p { margin-top: 48px; }
}

/* 主视觉 · 1025–1200 内容区：左右同步缩小 */
@media (max-width: 1200px) and (min-width: 1025px) {
  .about-hero-inner {
    grid-template-columns: minmax(0, 731fr) minmax(0, 589fr);
    gap: clamp(24px, 3.2vw, 32px);
    padding-top: 28px;
  }

  .about-hero-image {
    max-width: 100%;
    align-self: end;
    object-position: left bottom;
  }

  .about-hero-stats {
    padding-top: 24px;
    padding-bottom: 40px;
  }

  .about-hero-tagline {
    gap: 6px;
    margin-bottom: 20px;
  }

  .about-hero-tagline .num {
    font-size: clamp(42px, 4.6vw, 48px);
    letter-spacing: -1.26px;
  }

  .about-hero-tagline .text {
    font-size: clamp(32px, 3.6vw, 36px);
    letter-spacing: -0.96px;
  }

  .about-hero-ribbon {
    width: 96px;
    margin-bottom: 20px;
  }

  .about-hero-subtitle {
    font-size: clamp(18px, 2vw, 20px);
    letter-spacing: -0.54px;
    margin-bottom: 32px;
    max-width: 100%;
  }

  .about-hero-metrics {
    gap: 14px clamp(16px, 2.8vw, 32px);
    max-width: 100%;
  }

  .metric-item .label {
    font-size: 12px;
    margin-bottom: 6px;
  }

  .metric-item .value {
    font-size: clamp(30px, 3.2vw, 34px);
    letter-spacing: -1.5px;
  }

  .about-intro {
    padding: 48px 0 72px;
  }

  .about-intro .section-head { margin-bottom: 24px; }

  .about-intro-text p {
    padding: 0 clamp(24px, 4vw, 40px);
  }

  .about-intro-text p + p { margin-top: 40px; }
}

@media (max-width: 1200px) {
  .about-hero-inner {
    min-height: 0;
  }

  .culture { padding: 80px 0; }
}

@media (max-width: 1024px) {
  .about-hero {
    min-height: auto;
  }

  .about-hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    min-height: 0;
    padding: 32px 0 48px;
  }

  .about-hero-image {
    max-width: min(731px, 100%);
    margin: 0 auto;
    align-self: end;
    object-position: center bottom;
  }

  .about-hero-stats {
    padding-top: 0;
    width: 100%;
    padding-bottom:0;
  }

  .about-hero-tagline .num { font-size: 48px; }
  .about-hero-tagline .text { font-size: 36px; }
  .about-hero-subtitle { font-size: 20px; margin-bottom: 40px; }
  .metric-item .value { font-size: 36px; }

  .culture-layout { grid-template-columns: 1fr; }
  .culture { padding: 64px 0; }
  .culture-aside { min-height: auto; padding: 40px 28px; }
  .culture-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
  .culture-card { min-height: auto; }
  .milestone-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .about-intro {
    padding: 40px 0 64px;
  }

  .about-intro .section-head { margin-bottom: 24px; }

  .about-intro-text p {
    padding: 0;
  }

  .about-intro-text p + p { margin-top: 36px; }
}

@media (max-width: 768px) {
  .about-hero-inner {
    gap: 24px;
    padding: 24px 0 40px;
  }

  .about-hero-tagline {
    gap: 6px;
    margin-bottom: 20px;
  }

  .about-hero-ribbon { margin-bottom: 20px; }

  .about-hero-tagline .num { font-size: 44px; }
  .about-hero-tagline .text { font-size: 28px; }
  .about-hero-subtitle { font-size: 18px; margin-bottom: 32px; }
  .about-hero-metrics { gap: 16px 20px; }
  .metric-item .value { font-size: 32px; }

  .milestone-row,
  .culture-grid {
    grid-template-columns: 1fr;
  }

  .culture { padding: 48px 0; }
  .culture-aside { padding: 32px 24px; }
  .culture-title { font-size: 36px; }
  .culture-watermark {
    font-size: 36px;
    padding: 32px 24px 24px;
  }
  .culture-card p {
    padding: 0 24px 20px;
  }
  .culture-mission {
    padding: 0 24px;
  }

  .about-intro {
    padding: 32px 0 48px;
  }

  .about-intro .section-head { margin-bottom: 20px; }

  .about-intro-text p + p { margin-top: 28px; }
}

@media (max-width: 600px) {
  .about-hero-tagline .num { font-size: 40px; }
  .about-hero-tagline .text { font-size: 24px; }
  .about-hero-subtitle { font-size: 16px; }

  .about-hero-metrics {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .metric-item,
  .metric-item:nth-of-type(odd),
  .metric-item:nth-of-type(even) {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 16px 0;
  }

  .metric-item:last-of-type { border-bottom: none; }

  .culture { padding: 40px 0; }
  .culture-aside { padding: 28px var(--container-gutter, 16px); }
  .culture-watermark {
    font-size: 32px;
    padding: 28px var(--container-gutter, 16px) 20px;
  }
  .culture-card p {
    padding: 0 var(--container-gutter, 16px) 18px;
    font-size: 15px;
    line-height: 26px;
  }
  .culture-mission {
    padding: 0 var(--container-gutter, 16px);
    font-size: 15px;
    line-height: 22px;
  }

  .about-intro {
    padding: 28px 0 40px;
  }

  .about-intro .section-head { margin-bottom: 16px; }

  .about-intro-text p + p { margin-top: 24px; }
}