/* Dark Palette - 四種深色主題切換 */

/* ===== 主題定義 ===== */

/* 1. Midnight 純黑（預設深色，與原主題一致） */
[data-theme='dark'][data-dark-style='midnight'] {
  --global-bg: #0d1117;
  --card-bg: #161b22;
  --sidebar-bg: #161b22;
  --search-bg: #161b22;
  --preloader-bg: #0d1117;
  --sidebar-menu-bg: #1c2128;
  --btn-bg: #1c2128;
  --text-bg-hover: #2d333b;
  --blockquote-bg: #1c2128;
  --reward-pop: #1c2128;
  --timeline-bg: #1c2128;
  --zoom-bg: #161b22;
  --scrollbar-color: #2d333b;
  --tab-border-color: #2d333b;
  --tab-botton-bg: #2d333b;
  --tab-button-hover-bg: #343b44;
  --tab-button-active-bg: #161b22;
  --btn-hover-color: #4a5568;
}

[data-theme='dark'][data-dark-style='midnight'] .container code {
  background: #1c2128;
}
[data-theme='dark'][data-dark-style='midnight'] .container pre > code {
  background: #13171d;
}
[data-theme='dark'][data-dark-style='midnight'] #page-header.nav-fixed > #nav,
[data-theme='dark'][data-dark-style='midnight'] #page-header.not-top-img > #nav {
  background: rgba(13, 17, 23, 0.85);
}

/* 2. Charcoal 深灰 */
[data-theme='dark'][data-dark-style='charcoal'] {
  --global-bg: #1e1e2e;
  --card-bg: #27273a;
  --sidebar-bg: #27273a;
  --search-bg: #27273a;
  --preloader-bg: #1e1e2e;
  --sidebar-menu-bg: #2d2d42;
  --btn-bg: #2d2d42;
  --text-bg-hover: #3a3a52;
  --blockquote-bg: #2d2d42;
  --reward-pop: #2d2d42;
  --timeline-bg: #2d2d42;
  --zoom-bg: #27273a;
  --scrollbar-color: #3a3a52;
  --tab-border-color: #3a3a52;
  --tab-botton-bg: #3a3a52;
  --tab-button-hover-bg: #45455e;
  --tab-button-active-bg: #27273a;
  --btn-hover-color: #5a5a78;
  --font-color: rgba(205, 214, 244, 0.85);
  --hr-border: rgba(205, 214, 244, 0.35);
  --hr-before-color: rgba(205, 214, 244, 0.7);
  --search-input-color: rgba(205, 214, 244, 0.85);
  --search-a-color: rgba(205, 214, 244, 0.85);
  --preloader-color: rgba(205, 214, 244, 0.85);
  --tab-botton-color: rgba(205, 214, 244, 0.85);
  --btn-color: rgba(205, 214, 244, 0.85);
  --light-grey: rgba(205, 214, 244, 0.7);
  --dark-grey: rgba(205, 214, 244, 0.2);
  --white: rgba(205, 214, 244, 0.95);
  --text-highlight-color: rgba(205, 214, 244, 0.95);
  --blockquote-color: rgba(205, 214, 244, 0.7);
  --toc-link-color: rgba(205, 214, 244, 0.6);
}

[data-theme='dark'][data-dark-style='charcoal'] .container code {
  background: #2d2d42;
}
[data-theme='dark'][data-dark-style='charcoal'] .container pre > code {
  background: #232336;
}
[data-theme='dark'][data-dark-style='charcoal'] #page-header.nav-fixed > #nav,
[data-theme='dark'][data-dark-style='charcoal'] #page-header.not-top-img > #nav {
  background: rgba(30, 30, 46, 0.85);
}

/* 3. Ocean 深藍 */
[data-theme='dark'][data-dark-style='ocean'] {
  --global-bg: #0f1923;
  --card-bg: #162231;
  --sidebar-bg: #162231;
  --search-bg: #162231;
  --preloader-bg: #0f1923;
  --sidebar-menu-bg: #1b2b3d;
  --btn-bg: #1b2b3d;
  --text-bg-hover: #253748;
  --blockquote-bg: #1b2b3d;
  --reward-pop: #1b2b3d;
  --timeline-bg: #1b2b3d;
  --zoom-bg: #162231;
  --scrollbar-color: #253748;
  --tab-border-color: #253748;
  --tab-botton-bg: #253748;
  --tab-button-hover-bg: #2e4358;
  --tab-button-active-bg: #162231;
  --btn-hover-color: #3d5a78;
  --font-color: rgba(186, 213, 240, 0.85);
  --hr-border: rgba(186, 213, 240, 0.35);
  --hr-before-color: rgba(186, 213, 240, 0.7);
  --search-input-color: rgba(186, 213, 240, 0.85);
  --search-a-color: rgba(186, 213, 240, 0.85);
  --preloader-color: rgba(186, 213, 240, 0.85);
  --tab-botton-color: rgba(186, 213, 240, 0.85);
  --btn-color: rgba(186, 213, 240, 0.85);
  --light-grey: rgba(186, 213, 240, 0.7);
  --dark-grey: rgba(186, 213, 240, 0.2);
  --white: rgba(186, 213, 240, 0.95);
  --text-highlight-color: rgba(186, 213, 240, 0.95);
  --blockquote-color: rgba(186, 213, 240, 0.7);
  --toc-link-color: rgba(186, 213, 240, 0.6);
}

[data-theme='dark'][data-dark-style='ocean'] .container code {
  background: #1b2b3d;
}
[data-theme='dark'][data-dark-style='ocean'] .container pre > code {
  background: #121d2a;
}
[data-theme='dark'][data-dark-style='ocean'] #page-header.nav-fixed > #nav,
[data-theme='dark'][data-dark-style='ocean'] #page-header.not-top-img > #nav {
  background: rgba(15, 25, 35, 0.85);
}

/* 4. Forest 深綠 */
[data-theme='dark'][data-dark-style='forest'] {
  --global-bg: #0f1f14;
  --card-bg: #162a1c;
  --sidebar-bg: #162a1c;
  --search-bg: #162a1c;
  --preloader-bg: #0f1f14;
  --sidebar-menu-bg: #1c3524;
  --btn-bg: #1c3524;
  --text-bg-hover: #264230;
  --blockquote-bg: #1c3524;
  --reward-pop: #1c3524;
  --timeline-bg: #1c3524;
  --zoom-bg: #162a1c;
  --scrollbar-color: #264230;
  --tab-border-color: #264230;
  --tab-botton-bg: #264230;
  --tab-button-hover-bg: #2f4f3a;
  --tab-button-active-bg: #162a1c;
  --btn-hover-color: #3d6b4c;
  --font-color: rgba(186, 230, 198, 0.85);
  --hr-border: rgba(186, 230, 198, 0.35);
  --hr-before-color: rgba(186, 230, 198, 0.7);
  --search-input-color: rgba(186, 230, 198, 0.85);
  --search-a-color: rgba(186, 230, 198, 0.85);
  --preloader-color: rgba(186, 230, 198, 0.85);
  --tab-botton-color: rgba(186, 230, 198, 0.85);
  --btn-color: rgba(186, 230, 198, 0.85);
  --light-grey: rgba(186, 230, 198, 0.7);
  --dark-grey: rgba(186, 230, 198, 0.2);
  --white: rgba(186, 230, 198, 0.95);
  --text-highlight-color: rgba(186, 230, 198, 0.95);
  --blockquote-color: rgba(186, 230, 198, 0.7);
  --toc-link-color: rgba(186, 230, 198, 0.6);
}

[data-theme='dark'][data-dark-style='forest'] .container code {
  background: #1c3524;
}
[data-theme='dark'][data-dark-style='forest'] .container pre > code {
  background: #122419;
}
[data-theme='dark'][data-dark-style='forest'] #page-header.nav-fixed > #nav,
[data-theme='dark'][data-dark-style='forest'] #page-header.not-top-img > #nav {
  background: rgba(15, 31, 20, 0.85);
}

/* ===== 浮動色盤按鈕 ===== */

#dark-palette-btn {
  position: fixed;
  left: 15px;
  bottom: 60px;
  z-index: 10000;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--card-bg, #fff);
  color: var(--font-color, #4c4948);
  border: 1px solid var(--card-border-color, #e3e8f7);
  cursor: pointer;
  font-size: 18px;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.3s;
  line-height: 1;
  padding: 0;
}

/* 只在深色模式顯示 */
[data-theme='dark'] #dark-palette-btn {
  display: flex;
}

#dark-palette-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* 色盤面板 */
#dark-palette-panel {
  position: fixed;
  left: 15px;
  bottom: 105px;
  z-index: 10001;
  background: var(--card-bg, #1e1e2e);
  border: 1px solid var(--card-border-color, #2d333b);
  border-radius: 12px;
  padding: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px) scale(0.95);
  transition: opacity 0.25s, transform 0.25s, visibility 0.25s;
  min-width: 160px;
}

#dark-palette-panel.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#dark-palette-panel .palette-title {
  font-size: 11px;
  color: var(--font-color, #aaa);
  opacity: 0.6;
  margin-bottom: 8px;
  text-align: center;
  letter-spacing: 1px;
  text-transform: uppercase;
}

#dark-palette-panel .palette-options {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#dark-palette-panel .palette-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
}

#dark-palette-panel .palette-option:hover {
  background: var(--text-bg-hover, rgba(255,255,255,0.05));
}

#dark-palette-panel .palette-option.active {
  background: var(--text-bg-hover, rgba(255,255,255,0.08));
}

#dark-palette-panel .palette-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  flex-shrink: 0;
  transition: border-color 0.2s, transform 0.15s;
}

#dark-palette-panel .palette-option.active .palette-swatch {
  border-color: var(--btn-hover-color, #888);
  transform: scale(1.15);
}

#dark-palette-panel .palette-label {
  font-size: 13px;
  color: var(--font-color, #ccc);
  white-space: nowrap;
}

/* 各風格色塊 */
.swatch-midnight { background: linear-gradient(135deg, #0d1117, #161b22); }
.swatch-charcoal { background: linear-gradient(135deg, #1e1e2e, #27273a); }
.swatch-ocean    { background: linear-gradient(135deg, #0f1923, #162231); }
.swatch-forest   { background: linear-gradient(135deg, #0f1f14, #162a1c); }

/* ===== 背景遮罩過渡 ===== */
[data-theme='dark'] #web_bg:before {
  transition: background-color 0.4s ease;
}