/* 区块级排版：非对称双栏 + 错位节奏 */

.section-head {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  column-gap: 20px;
  align-items: start;
}

.section-index {
  grid-row: 1 / span 2;
  grid-column: 1;
  margin: 0;
  padding-top: 8px;
  border-top: 1px solid var(--accent);
}

.section-head h2 {
  grid-column: 2;
}

.section-desc {
  grid-column: 2;
}

/* ---------- 01 我们的优势 ---------- */

.adv-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(32px, 5vw, 64px);
  margin: clamp(36px, 5vw, 56px) 0 0;
  padding: 0;
  list-style: none;
}

.adv-item {
  padding: 26px 0 24px;
  border-top: 1px solid var(--line);
}

.adv-item:nth-child(even) {
  margin-top: 44px;
}

.adv-num {
  display: inline-block;
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--accent);
}

.adv-item h3 {
  margin: 10px 0 8px;
  font-size: 19px;
  color: var(--primary);
}

.adv-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 02 服务项目 ---------- */

.services-intro {
  max-width: 58em;
  margin: clamp(32px, 4vw, 44px) 0 clamp(36px, 4vw, 48px);
  font-size: 16px;
  color: var(--muted);
}

.srv-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.srv-item {
  position: relative;
  padding: 28px 26px 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.srv-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 3px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.srv-item:hover::before {
  width: 100%;
}

.srv-item h3 {
  font-size: 18px;
  color: var(--primary);
}

.srv-item p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 03 联系方式 ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
}

.contact-list {
  margin: 0;
  border-top: 2px solid var(--primary);
}

.contact-row {
  display: flex;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.contact-row dt {
  flex: 0 0 92px;
  font-size: 14px;
  color: var(--muted);
}

.contact-row dd {
  margin: 0;
  font-size: 16px;
  color: var(--ink);
  word-break: break-all;
}

/* ---------- 04 关于我们 ---------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.5fr);
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
}

.about-body {
  font-size: 16px;
  color: var(--muted);
}

.about-body p {
  margin-bottom: 1.1em;
}

.about-sign {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--serif);
  color: var(--primary);
}

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .contact-grid,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .srv-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .section-head {
    grid-template-columns: 1fr;
    row-gap: 8px;
  }

  .section-index {
    grid-row: 1;
    grid-column: 1;
    padding-top: 0;
  }

  .section-head h2,
  .section-desc {
    grid-column: 1;
  }

  .adv-grid {
    grid-template-columns: 1fr;
  }

  .adv-item:nth-child(even) {
    margin-top: 0;
  }

  .srv-grid {
    grid-template-columns: 1fr;
  }

  .contact-row {
    flex-direction: column;
    gap: 2px;
  }

  .contact-row dt {
    flex-basis: auto;
  }
}