/**
 * DevCraft Studio - Header 导航升级
 * Sticky + Backdrop Blur + 响应式
 */

/* ==================== Header 容器 ==================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--theme);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s ease;
}

.header.scrolled {
  background: rgba(250, 250, 255, 0.8);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .header.scrolled {
  background: rgba(15, 10, 30, 0.8);
}

/* ==================== Header 内容布局 ==================== */
.header-inner {
  max-width: var(--nav-width);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  transition: height 0.3s ease;
}

.header.scrolled .header-inner {
  height: 56px;
}

/* ==================== Logo 样式 ==================== */
.logo {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-decoration: none;
  font-weight: var(--font-bold);
  font-size: var(--text-lg);
  color: var(--primary);
  transition: all 0.2s ease;
}

.logo:hover {
  color: var(--accent);
}

.logo img,
.logo svg {
  height: 32px;
  width: auto;
  transition: transform 0.2s ease;
}

.logo:hover img,
.logo:hover svg {
  transform: scale(1.05);
}

/* ==================== 主导航菜单 ==================== */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu li {
  margin: 0;
}

.nav-menu a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  color: var(--secondary);
  text-decoration: none;
  font-weight: var(--font-medium);
  font-size: var(--text-base);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  position: relative;
}

.nav-menu a:hover {
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
}

.nav-menu a.active {
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
}

.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.nav-menu svg {
  width: 16px;
  height: 16px;
  opacity: 0.7;
}

/* ==================== 右侧操作区 ==================== */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 搜索按钮 */
.search-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.search-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.05);
}

/* 主题切换按钮 */
.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.05);
  transform: rotate(180deg);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* ==================== 移动端菜单按钮 ==================== */
.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.mobile-menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu-toggle:hover {
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.05);
}

.mobile-menu-toggle:hover span {
  background: var(--accent);
}

/* 激活状态 */
.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translateY(7px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-7px);
}

/* ==================== 移动端抽屉菜单 ==================== */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  background: var(--entry);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-xl);
  z-index: 9999;
  overflow-y: auto;
  transition: right 0.3s ease;
}

.mobile-drawer.active {
  right: 0;
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--gap);
  border-bottom: 1px solid var(--border);
}

.mobile-drawer-title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--primary);
  margin: 0;
}

.mobile-drawer-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.mobile-drawer-close:hover {
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
}

.mobile-drawer-menu {
  list-style: none;
  margin: 0;
  padding: var(--gap);
}

.mobile-drawer-menu li {
  margin: 0;
}

.mobile-drawer-menu a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  color: var(--content);
  text-decoration: none;
  font-weight: var(--font-medium);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  margin-bottom: 4px;
}

.mobile-drawer-menu a:hover,
.mobile-drawer-menu a.active {
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
}

.mobile-drawer-menu svg {
  width: 20px;
  height: 20px;
}

/* 遮罩层 */
.mobile-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  z-index: 9998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.mobile-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* ==================== 搜索展开面板 ==================== */
.search-panel {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--entry);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  padding: var(--gap);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.search-panel.active {
  max-height: 200px;
  padding: calc(var(--gap) * 1.5) var(--gap);
}

.search-input-wrapper {
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 12px 48px 12px 16px;
  background: var(--theme);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--content);
  font-size: var(--text-base);
  font-family: var(--font-sans);
  transition: all 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-input::placeholder {
  color: var(--secondary);
}

.search-submit {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}

.search-submit:hover {
  background: var(--accent-2);
  transform: translateY(-50%) scale(1.05);
}

/* ==================== 响应式断点 ==================== */
@media (max-width: 900px) {
  .nav-menu {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    height: 56px;
  }

  .logo img,
  .logo svg {
    height: 28px;
  }

  .mobile-drawer {
    width: 100%;
  }

  .header-actions {
    gap: 6px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 12px;
    height: 52px;
  }

  .logo {
    flex: 1;
    min-width: 0;
  }

  .logo img,
  .logo svg {
    height: 24px;
    max-width: 120px;
    object-fit: contain;
  }

  .logo span {
    display: none;
  }

  .header-actions {
    gap: 4px;
    flex-shrink: 0;
  }

  .search-toggle,
  .theme-toggle,
  .mobile-menu-toggle {
    width: 36px;
    height: 36px;
    padding: 8px;
  }

  .search-toggle svg,
  .theme-toggle svg,
  .mobile-menu-toggle svg {
    width: 20px;
    height: 20px;
  }
}

/* ==================== 滚动行为 ==================== */
@media (prefers-reduced-motion: reduce) {
  .header,
  .header-inner,
  .mobile-drawer,
  .mobile-overlay,
  .search-panel {
    transition: none;
  }
}

/* ==================== 打印样式 ==================== */
@media print {
  .header {
    position: static;
    box-shadow: none;
  }

  .header-actions,
  .mobile-menu-toggle {
    display: none;
  }
}