/* ============================================================
   Header Component Styles
   ============================================================ */

/* ----- 头栏容器 ----- */
.header__inner {
  max-width: var(--content-max-width);
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  height: 100%;
}

/* ----- Logo ----- */
.header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  margin-right: var(--space-sm);
}

.header__logo-text {
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

/* ----- 主导航 ----- */
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex: 1;
}

.header__nav-link {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.header__nav-link:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.header__nav-link--active {
  color: var(--color-primary);
  font-weight: 600;
  background: var(--color-primary-light);
}

/* ----- 搜索图标 ----- */
.header__search {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
}

.header__search:hover {
  color: var(--color-primary);
  background: var(--color-border-light);
}

/* ----- 移动端汉堡菜单 (checkbox hack) ----- */
.js-header-toggle {
  display: none;
}

.header__menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  position: relative;
  flex-shrink: 0;
}

.header__menu-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-sm);
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.header__menu-bar + .header__menu-bar {
  margin-top: var(--space-xs);
}

.js-header-toggle:checked ~ .header__menu-btn .header__menu-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.js-header-toggle:checked ~ .header__menu-btn .header__menu-bar:nth-child(2) {
  opacity: 0;
}

.js-header-toggle:checked ~ .header__menu-btn .header__menu-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ----- 移动端下拉菜单 ----- */
.header__mobile-menu {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--bg-card-solid);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  box-shadow: var(--shadow-card-hover);
  padding: var(--space-sm) 0;
  flex-direction: column;
  border-top: 1px solid var(--color-border-light);
}

.js-header-toggle:checked ~ .header__mobile-menu {
  display: flex;
}

.header__mobile-nav-link {
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-primary);
  transition: background var(--transition-fast), color var(--transition-fast);
  border-bottom: 1px solid var(--color-border-light);
}

.header__mobile-nav-link:last-child {
  border-bottom: none;
}

.header__mobile-nav-link:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* ----- 响应式 ----- */
@media (max-width: 767px) {
  .header__nav {
    display: none;
  }

  .header__search {
    display: none;
  }

  .header__menu-btn {
    display: flex;
  }

  .header__inner {
    justify-content: space-between;
    padding: 0 var(--space-sm);
  }
}

@media (min-width: 768px) {
  .header__menu-btn {
    display: none;
  }

  .header__mobile-menu {
    display: none !important;
  }
}

/* ===== Site Header (review articles pattern) ===== */
.site-header {
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  padding: 0 20px;
  height: 56px;
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .header-inner {
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-header .logo {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
}
.site-header .logo-icon { font-size: 20px; color: #eab308; }
.site-header .logo-text { font-size: 17px; font-weight: 700; color: #1e293b; }
.site-header .main-nav { display: flex; gap: 8px; }
.site-header .main-nav a {
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 500;
  color: #64748b;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.15s;
}
.site-header .main-nav a:hover { color: #1e293b; background: #f1f5f9; }
.site-header .main-nav a.active { color: #0284c7; background: #f0f9ff; }