html {
  margin: 0 !important;
  padding: 0 !important;
  min-height: 100vh;
}

body {
  margin: 0 !important;
  padding: 0 !important;
  min-height: 100vh;
  display: flex !important;
  flex-direction: column !important; /* 強制所有內容垂直排列 */
}

:root {
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 64px;
  --transition-speed: 0.3s;
}

/* 側邊欄改用 Fixed 定位 */
.sidebar {
  position: fixed !important;
  left: 0;
  top: 0 !important;
  bottom: 0;
  width: var(--sidebar-width) !important;
  background: #f9fbf7 !important;
  border-right: 1px solid rgba(0,0,0,0.05);
  display: flex;
  flex-direction: column;
  /* V38: 性能優化 - 使用 will-change 與優化 transition */
  transition: width var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
  will-change: width;
  z-index: 1000;
  padding-top: 0 !important;
  /* 避免動畫期間內容溢出導致的滾動條閃爍 */
  overflow-x: hidden;
  overflow-y: auto;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width) !important;
}

/* ==========================================
   桌機版佈局 (Desktop Layout > 1024px)
   ========================================== */
@media (min-width: 1025px) {
  .main-header, .main, .main-footer-guestbook, .site-footer {
    margin-left: var(--sidebar-width) !important;
    /* V38: 性能優化 - 增加 will-change 並使用硬體加速 */
    transition: margin-left var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1) !important;
    will-change: margin-left;
    transform: translateZ(0); 
  }

  .sidebar.collapsed ~ header.main-header,
  .sidebar.collapsed ~ .main,
  .sidebar.collapsed ~ .main-footer-guestbook,
  .sidebar.collapsed ~ .site-footer {
    margin-left: var(--sidebar-collapsed-width) !important;
  }

  body header.main-header {
    padding: 40px 0 20px 60px !important;
  }
}

/* ==========================================
   手機與平板佈局 (Mobile & Tablet <= 1024px)
   ========================================== */
@media (max-width: 1024px) {
  .sidebar {
    display: none !important;
  }

  .main-header, .main, .main-footer-guestbook {
    margin-left: 0 !important;
    width: 100% !important;
    left: 0 !important;
    padding-left: 10px !important;
    padding-right: 10px !important;
    box-sizing: border-box !important;
  }

  body header.main-header {
    padding-top: 30px !important;
    background: transparent !important;
  }

  .main-header .brand {
    gap: 15px !important;
    justify-content: flex-start !important;
  }
}

/* 共通樣式：標題區內部 */
header.main-header {
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
}

header.main-header .brand {
  display: flex !important;
  flex-direction: row !important;
  align-items: center !important;
  gap: 20px !important;
  margin-left: 0 !important;
  padding: 0 !important;
  background: transparent !important;
  box-shadow: none !important;
}

header.main-header .brand-icon {
  font-size: 36px !important;
  background: transparent !important;
  width: auto !important;
  height: auto !important;
  margin: 0 !important;
  box-shadow: none !important;
}

header.main-header .brand-text {
  text-align: left !important;
  background: transparent !important;
}

header.main-header h1 {
  font-size: 28px;
  margin: 0;
  color: #333;
  background: transparent !important;
}

header.main-header p {
  margin: 5px 0 0;
  color: #888;
  font-size: 14px;
  background: transparent !important;
}

/* 共通樣式：主內容區 (僅桌機) */
@media (min-width: 1025px) {
  .main {
    max-width: none !important;
    padding: 0 60px 40px !important;
  }
}

/* 側邊欄內部元素 */
.sidebar-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 0 10px !important; 
  margin-top: 0 !important;
}

.toggle-btn {
  background: transparent !important;
  color: var(--green) !important;
  border: none !important;
  border-radius: 18px;
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 20px;
  box-shadow: none !important;
}

/* 漢堡選單與「新增明信片」之間：收藏張數 */
.sidebar-card-count-row {
  width: 100%;
  padding: 0 15px;
  margin-bottom: 12px !important; /* 讓按鈕上移 */
  box-sizing: border-box;
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  gap: 20px; /* 增加總計與今日新增的距離 */
}

.sidebar-card-count-line {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px 6px;
  font-size: 12px;
  color: rgba(80, 70, 50, 0.7);
  line-height: 1.2;
  width: 100%;
}

.sidebar-card-count-line.today-count {
  background: rgba(120, 201, 107, 0.06);
  padding: 6px 12px;
  border-radius: 14px;
  border: 1px solid rgba(120, 201, 107, 0.1);
}

.sidebar-card-count-label {
  font-size: 12px;
  font-weight: 600;
  color: rgba(80, 70, 50, 0.5);
  transition: opacity var(--transition-speed) ease;
}

.sidebar-card-count-value {
  font-size: 18px;
  font-weight: 800;
  color: var(--green);
  letter-spacing: -0.01em;
}

.sidebar-card-count-unit {
  font-size: 11px;
  font-weight: 600;
  color: rgba(80, 70, 50, 0.5);
}

.sidebar.collapsed .sidebar-header {
  padding: 10px 0 5px !important;
}

.sidebar.collapsed .sidebar-card-count-row {
  padding: 0;
  margin-bottom: 8px !important;
  gap: 20px; /* 拉開 233 與 0 的距離 */
}

.sidebar.collapsed .sidebar-card-count-line.today-count {
  padding: 0;
  background: transparent;
  border: none;
}

.sidebar.collapsed .sidebar-card-count-label,
.sidebar.collapsed .sidebar-card-count-unit {
  display: none !important;
}

.sidebar.collapsed .sidebar-card-count-value {
  font-size: 14px;
  display: block;
  line-height: 1;
  text-align: center;
  font-weight: 700;
}

.nav-menu {
  padding: 10px 5px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav-item {
  display: flex !important;
  align-items: center;
  gap: 15px;
  padding: 12px 15px !important;
  border-radius: 15px !important;
  background: transparent !important;
  color: #666;
  width: 100%;
}

.nav-item.active {
  background: var(--green) !important;
  color: #fff !important;
}

.sidebar.collapsed .nav-item {
  width: 54px !important;
  height: 54px !important;
  padding: 0 !important;
  margin: 0 auto !important;
  justify-content: center !important;
  border-radius: 18px !important;
}

/* 側邊欄上傳按鈕 */
.sidebar-upload-trigger {
  padding: 0 15px;
  margin-top: -15px !important; /* 讓按鈕整體上移 15px */
}

#openUploadBtn {
  width: 100%;
  height: 50px;
  border-radius: 25px;
  background: var(--green);
  color: #fff;
  border: none;
  cursor: pointer;
  font-weight: 500;
  transition: all var(--transition-speed) ease;
  
  /* 防止文字抖動的關鍵 */
  display: flex !important;
  align-items: center;
  justify-content: center;
  gap: 8px;
  white-space: nowrap !important;
  overflow: hidden !important;
}

.btn-text {
  transition: opacity var(--transition-speed) ease, transform var(--transition-speed) ease;
  will-change: opacity, transform;
  display: inline-block;
  white-space: nowrap !important;
}

.sidebar.collapsed .sidebar-upload-trigger {
  display: flex !important;
  justify-content: center !important;
  padding: 0 !important;
  margin-top: -15px !important;
}

.sidebar.collapsed #openUploadBtn {
  width: 54px !important;
  height: 54px !important;
  border-radius: 18px !important;
  background: transparent !important;
  color: var(--green) !important;
  box-shadow: none !important;
  border: none !important;
  outline: none !important;
}

/* 側邊欄各區塊的過渡基礎 */
.brand-text {
  transition: opacity var(--transition-speed) ease, transform var(--transition-speed) ease, max-height var(--transition-speed) ease;
  will-change: opacity, transform;
  overflow: hidden;
  min-width: 240px;
  max-height: 100px;
  margin-top: -15px !important;
}

.sidebar-notice {
  transition: opacity var(--transition-speed) ease, transform var(--transition-speed) ease, max-height var(--transition-speed) ease;
  will-change: opacity, transform;
  overflow: hidden;
  min-width: 240px;
  max-height: 1000px; /* 允許展開 */
  margin-top: -5px !important;
}

.notice-title {
  white-space: nowrap !important; /* 標題禁止換行 */
}

/* 隱藏展開時的文字：改用透明度與位移，避免觸發高度重算 */
.sidebar.collapsed .brand-text,
.sidebar.collapsed .sidebar-notice {
  opacity: 0 !important;
  transform: translateY(-10px);
  pointer-events: none;
  visibility: hidden;
  /* 瞬間收起高度，不使用動畫 */
  max-height: 0;
  margin: 0 !important;
}

.sidebar.collapsed .btn-text {
  opacity: 0 !important;
  transform: scale(0.5);
  pointer-events: none;
  width: 0;
  display: none;
}

/* 底部留言板 */
.main-footer-guestbook {
  padding: 40px !important;
  background: #fdfdfd;
  border-top: 1px solid #eee;
}

@media (max-width: 1024px) {
  .main-footer-guestbook {
    padding: 30px 100px !important; /* 極致縮排，將內容完全鎖定在中間 */
  }
}

/* 公告區：電腦版側邊欄 */
#bulletinContainer {
  min-height: 250px !important;
  height: 250px !important;
  max-height: 250px !important;
  overflow-y: auto !important;
}

#bulletinContent {
  line-height: 1.45 !important;
  font-size: 13px !important;
  padding-bottom: 20px !important; /* 底部預留 20px 空間 */
}

/* 窄版：公告與收藏 grid 同寬，置於 #grid 上方 */
.mobile-bulletin-section {
  display: none;
}

@media (max-width: 1024px) {
  .mobile-bulletin-section {
    display: block;
    width: 100%;
    margin: 0 0 14px 0;
  }

  .mobile-bulletin-card {
    width: 100%;
    background: #fffef6;
    border-radius: 20px;
    padding: 12px;
    box-shadow: none;
    border: none;
  }

  /* 與側欄 #bulletinContainer 類似：保留最小高度、長文可捲動，避免佔滿螢幕 */
  .mobile-bulletin-content {
    margin-top: 8px;
    font-size: 13px;
    line-height: 1.45;
    transition: opacity 0.5s ease;
    color: var(--green-dark);
    min-height: 80px;
    max-height: 250px;
    height: auto;
    overflow-y: auto;
    overflow-x: hidden;
    word-break: break-word;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding-bottom: 20px !important; /* 防止內容被裁切 */
  }

  .mobile-bulletin-content img {
    width: 100%;
    max-height: 150px;
    object-fit: cover;
    border-radius: 14px;
    display: block;
    margin-bottom: 8px;
  }

  .mobile-bulletin-content a {
    color: var(--green-dark);
    text-decoration: none;
  }

  /* 手機 sidebar 內公告隱藏，避免重複 */
  .sidebar .sidebar-notice {
    display: none !important;
  }
}

/* 今日精選明信片樣式 */
.sidebar-featured-card {
  padding: 0 15px;
  margin-top: 5px !important;
  margin-bottom: 24px;
  transition: opacity var(--transition-speed) ease, transform var(--transition-speed) ease, max-height var(--transition-speed) ease;
  will-change: opacity, transform;
  max-height: 500px;
  overflow: hidden;
}

.featured-card-box {
  margin-top: 10px;
  background: #fff;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(72, 90, 56, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.03);
  cursor: pointer;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
  will-change: transform;
}

.featured-card-box:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 12px 28px rgba(72, 90, 56, 0.15);
}

.featured-card-img-wrap {
  width: 100%;
  height: auto;
  aspect-ratio: 16/9; /* 或者您偏好的比例 */
  background: #f0f3ec;
  overflow: hidden;
  display: block;
}

.featured-card-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  aspect-ratio: 16/9;
}

.featured-card-info {
  padding: 10px 12px;
}

.featured-card-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--green-dark);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.featured-card-author {
  font-size: 11px;
  color: #99a;
  margin-top: 2px;
}

/* 收合狀態時隱藏精選卡片 */
.sidebar.collapsed .sidebar-featured-card {
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
  max-height: 0;
  margin: 0;
}