/* ===== 導航欄 ===== */
/*
 * 這裡用 sticky 而不是 fixed，是有原因的：
 * fixed 會讓 navbar 脫離文件流，後面的內容不知道它佔了位置，就會滑到它底下
 * （= 過去一直遇到的 header 與輪播重疊）。以前是靠 body { padding-top } 猜一個
 * 高度來補，但 navbar 是 height:auto，選單換行時高度會變，猜錯就重疊，
 * 於是又疊了 !important、clear:both 等一堆補丁。
 * sticky 留在文件流裡自己佔位，捲動時照樣固定在頂端，重疊在物理上不可能發生。
 * 改動前請先確認：祖先元素不能有 overflow: hidden/auto/scroll，否則 sticky 失效。
 */
.navbar {
    width: 100%;
    background: var(--bg-white);
    box-shadow: var(--shadow-soft);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0;
    height: auto;
}

/* 上行容器 */
.top-bar {
    background: var(--bg-white);
    padding: var(--space-md) 0 0 0;
    border-bottom: none;
}

.top-bar-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-lg);
    margin-top: 0;
    margin-bottom: var(--space-xs);
}

/* 下行容器 */
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xs) var(--space-lg);
    margin-bottom: 0;
    background: transparent;
    margin-top: 0;
}

/* 選單圓角灰色框 */
.nav-links {
    background: var(--bg-section);
    border-radius: var(--radius-medium);
    padding: var(--space-xs) var(--space-sm);
    box-shadow: var(--shadow-soft);
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    max-height: 50px;
    margin-top: 0;
}

/* 自訂 logo 圖片樣式 */
.logo .custom-logo {
    max-height: 50px;
    max-width: 200px;
    width: auto;
    height: auto;
    object-fit: contain;
    display: block;
}

/* 確保 logo 連結不會影響佈局 */
.logo .custom-logo-link {
    display: inline-block;
    max-height: 50px;
    text-decoration: none;
}

/* Header 搜尋欄美化 */
.header-search .search-form, .search-form {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 400px;
  background: #fff;
  border-radius: var(--radius-medium);
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--border-light);
  padding: 0;
  margin: 0 auto;
}

.header-search .search-input-group, .search-input-group {
  display: flex;
  align-items: center;
  width: 100%;
}

.header-search .search-field, .search-field {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 1rem;
  padding: 0.7em 1em;
  border-radius: var(--radius-medium) 0 0 var(--radius-medium);
  color: var(--text-primary);
  height: 44px;
  min-width: 0;
}

.header-search .search-submit, .search-submit {
  background: var(--bg-light);
  border: none;
  outline: none;
  padding: 0 18px;
  border-radius: 0 var(--radius-medium) var(--radius-medium) 0;
  font-size: 1.2rem;
  color: var(--text-secondary);
  cursor: pointer;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  border-left: 1px solid var(--border-light);
}

.header-search .search-submit:hover, .search-submit:hover {
  background: var(--border-light);
  color: var(--text-primary);
}

.header-search .search-submit .screen-reader-text, .search-submit .screen-reader-text {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* 登入按鈕區域 */
.header-actions {
    display: flex;
    gap: var(--space-sm);
}

.header-btn {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-small);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.header-btn.register {
    background: var(--primary-color);
    color: white;
}

.header-btn.login {
    background: var(--primary-light);
    color: white;
}

.header-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

/* 主選單 */
.nav-links {
    display: flex !important;
    list-style: none !important;
    margin: 0 !important;
    gap: 0;
    align-items: center;
}

.nav-links .menu-item {
    position: relative;
    display: block;
}

.nav-links .menu-item > a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.05rem;
    padding: var(--space-xs) var(--space-sm);
    display: block;
    white-space: nowrap;
    transition: all 0.2s ease;
    border-radius: var(--radius-small);
}

.nav-links .menu-item > a:hover,
.nav-links .menu-item:hover > a {
    background: var(--primary-bg);
    color: var(--primary-dark);
}

/* 下拉選單 */
.nav-links .sub-menu {
    position: absolute;
    left: 50%;
    top: 100%;
    transform: translateX(-50%) translateY(-10px);
    min-width: 220px;
    background: var(--bg-white);
    box-shadow: var(--shadow-medium);
    border-radius: var(--radius-medium);
    padding: var(--space-xs) 0;
    z-index: 1200;
    list-style: none !important;
    margin: 0 !important;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s ease;
    border-top: 3px solid var(--primary-color);
    pointer-events: none;
}

.nav-links .menu-item:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.nav-links .sub-menu .menu-item {
    display: block;
    width: 100%;
}

.nav-links .sub-menu .menu-item > a {
    color: var(--text-primary);
    font-size: 0.95rem;
    padding: var(--space-sm) var(--space-md);
    border-radius: 0;
    margin: 0;
    display: block;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.nav-links .sub-menu .menu-item > a:hover {
    background: var(--bg-section);
    color: var(--primary-dark);
    border-left-color: var(--primary-color);
    padding-left: calc(var(--space-md) + var(--space-xs));
}

/* ===== 手機版選單 ===== */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--space-xs);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
    transform-origin: center;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
    background: var(--primary-color);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
    background: var(--primary-color);
}

/* 改良手機版選單 - 全螢幕風格 */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

/* 手機版選單關閉按鈕 */
.mobile-menu-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1001;
}

.mobile-menu-close:hover {
    background: var(--primary-color);
    transform: scale(1.1);
}

.mobile-menu-close span {
    font-size: 2rem;
    color: var(--primary-color);
    line-height: 1;
    transition: color 0.3s ease;
}

.mobile-menu-close:hover span {
    color: white;
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

/* 選單背景遮罩 */
.mobile-menu::before {
    display: none;
}

.mobile-menu.active::before {
    display: none;
}

.mobile-nav-links {
    list-style: none !important;
    margin: 0 !important;
    padding: 0 !important;
    text-align: center;
    width: 100%;
    margin-top: 6rem !important;
}

.mobile-nav-links .menu-item {
    margin: 0 0 1rem 0 !important;
    border-bottom: none;
}

.mobile-nav-links .menu-item:last-child {
    margin-bottom: 0 !important;
}

.mobile-nav-links .menu-item > a {
    display: block;
    padding: 0.5rem 2rem;
    color: #333;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 400;
    text-align: center;
    transition: all 0.2s ease;
    border-radius: 0;
    background: transparent;
}

.mobile-nav-links .menu-item > a:hover,
.mobile-nav-links .current-menu-item > a {
    color: var(--primary-color);
    background: transparent;
    transform: none;
}

.mobile-nav-links .sub-menu {
    display: none;
    background: transparent;
    list-style: none !important;
    margin: 1rem 0 0 0 !important;
    padding: 0 !important;
    transition: all 0.3s ease;
    max-height: none;
    overflow: visible;
}

.mobile-nav-links .submenu-open > .sub-menu {
    display: block;
    max-height: none;
    padding: 0;
}

.mobile-nav-links .sub-menu .menu-item > a {
    padding: 0.5rem 1rem;
    font-size: 1.2rem;
    color: #666;
    transition: all 0.2s ease;
    margin: 0;
    border: none;
}

.mobile-nav-links .sub-menu .menu-item > a:hover {
    background: transparent;
    color: var(--primary-color);
    transform: none;
}

/* 響應式顯示控制 */
.desktop-only {
    display: block;
}

.tablet-mobile-only {
    display: none;
}