/* 布局样式 - Header, Footer, Main structure */

header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

.header-top {
  height: 40px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 14px;
  display: flex;
  align-items: center;
}

.header-main {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap; /* 強制不換行 */
}

/* Header Responsive */
@media (max-width: 1200px) {
  nav ul {
    gap: 15px; /* 縮小導航間距以騰出空間 */
  }
}

@media (max-width: 992px) {
  .header-main {
    height: auto;
    padding: 15px 20px;
    flex-wrap: wrap; /* 平板及手機端允許換行 */
    gap: 15px;
  }
  /* ... rest of responsive styles ... */
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  flex-shrink: 0; /* 防止 Logo 被壓縮 */
}

.logo img {
  height: 45px;
  margin-right: 12px;
}

nav {
  margin: 0 20px;
  flex: 1; /* 讓導航占據剩餘空間 */
  display: flex;
  justify-content: center; /* 導航居中 */
  min-width: 0; /* 允許 nav 內部的 ul 收縮 */
}

nav ul {
  display: flex;
  gap: 30px;
  flex-wrap: nowrap;
}

nav ul li a {
  font-weight: 500;
  color: var(--color-text-main);
  white-space: nowrap; /* 文字不換行 */
}

nav ul li a:hover,
nav ul li a.active {
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-shrink: 0; /* 防止操作區被壓縮 */
}

.search-bar {
  position: relative;
  display: flex;
  align-items: center;
}

.search-bar input {
  padding: 8px 15px;
  padding-right: 35px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  width: 180px; /* 默認寬度稍作縮小 */
  transition: var(--transition-base);
}

.search-bar input:focus {
  width: 220px; /* 縮小聚焦時的擴展寬度，避免擠壓 */
  border-color: var(--color-primary);
}

.search-bar .icon {
  position: absolute;
  right: 12px;
  color: var(--color-text-helper);
}

/* Footer */
footer {
  background-color: #ffffff;
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 576px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

.footer-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-primary);
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 30px;
  text-align: center;
  color: var(--color-text-helper);
  font-size: 14px;
}