/* 首页专属样式 */
.main-container {
  max-width: 1024px;
  margin: 32px auto;
  display: flex;
  gap: 24px;
}
.left-panel {
  width: 320px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
  padding: 24px;
  height: fit-content;
}
.right-panel {
  flex: 1;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
  padding: 24px;
}
.desc {
  text-align: center;
  color: #1976d2;
  font-size: 1.08em;
  margin: 0 0 18px 0;
  line-height: 1.7;
}
/* 左侧科学计算器样式 */
.calc-title {
  font-size: 1.2em;
  font-weight: bold;
  margin-bottom: 16px;
  color: #1565c0;
  text-align: center;
}
.calc-input {
  width: 100%;
  padding: 8px;
  border-radius: 6px;
  border: 1px solid #b0bec5;
  text-align: center;
  font-size: 1em;
  margin-bottom: 8px;
  box-sizing: border-box;
}
.calc-btn {
  width: 100%;
  padding: 12px 0;
  background: #1976d2;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1.1em;
  font-weight: 500;
  cursor: pointer;
  margin-bottom: 12px;
}
.calc-btn:hover {
  background: #1565c0;
}
.calc-result {
  margin: 12px 0 0 0;
  text-align: center;
  font-size: 1.1em;
  color: #388e3c;
  min-height: 2em;
  word-break: break-all;
}
.calc-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}
.calc-btn-small {
  padding: 8px;
  background: #e3f2fd;
  color: #1976d2;
  border: none;
  border-radius: 6px;
  font-size: 0.9em;
  cursor: pointer;
}
.calc-btn-small:hover {
  background: #bbdefb;
}
/* 右侧分类样式 */
.section-title {
  font-size: 1.3em;
  font-weight: bold;
  margin-bottom: 16px;
  color: #1565c0;
}
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.category-card {
  background: #e3f2fd;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 2px 8px rgba(25,118,210,0.07);
}
.category-name {
  font-size: 1.1em;
  font-weight: bold;
  color: #1976d2;
  margin-bottom: 12px;
}
.calc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.calc-list li {
  margin-bottom: 8px;
}
.calc-list a {
  color: #333;
  text-decoration: none;
  font-size: 0.95em;
  display: block;
  padding: 6px 8px;
  border-radius: 4px;
  transition: background 0.2s;
}
.calc-list a:hover {
  background: #bbdefb;
  color: #1976d2;
}
@media (max-width: 1024px) {
  .main-container { max-width: 99vw; margin: 0.5em auto; flex-direction: column; }
  .left-panel { width: 100%; }
  .category-grid { grid-template-columns: 1fr; }
}
@media (max-width: 500px) {
  .nav-row { flex-direction: column; gap: 6px; margin: 0 6px; }
  .logo { font-size: 1.1em; }
}