/**
 * 右下角閱讀工具：字級切換與回到頂端
 *
 * @package Yafun2027
 */

/* ==========================================================================
   右下角閱讀工具：字級切換與回到頂端（考量年長讀者，按鈕 56px）
   只放大文章內文（prose.css 的 .entry-content 字級乘上 --yf-fs）；標題、選單等維持原大小
   ========================================================================== */

html.yf-fs-l {
  --yf-fs: 1.12;
}

html.yf-fs-xl {
  --yf-fs: 1.25;
}

.yf-tools {
  position: fixed;
  right: max(16px, env(safe-area-inset-right, 0px));
  bottom: max(16px, env(safe-area-inset-bottom, 0px));
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  font-size: 16px; /* 工具本身不隨字級縮放，避免按鈕位置跳動 */
}

.yf-share-fab,
.yf-fs-toggle,
.yf-totop {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  padding: 0;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--color-leaf);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.12), 0 6px 18px rgba(31, 42, 36, 0.28);
  cursor: pointer;
  transition: background-color 0.2s, transform 0.2s;
}

/* 字級按鈕圖示：小 A ＋ 大 A（與標題學名 .yf-latin 相同的 Cormorant Garamond 斜體），下方沙色細線表示「由小到大」 */
.yf-fs-icon {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 1px;
  padding-bottom: 5px;
  font-family: "Cormorant Garamond", Georgia, serif;
  font-weight: 600;
  letter-spacing: 0;
  line-height: 0.8;
}

.yf-fs-icon::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 1px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(241, 227, 196, 0.35), #f1e3c4);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.yf-fs-icon-s {
  font-size: 17px;
  opacity: 0.8;
}

.yf-fs-icon-l {
  font-size: 30px;
  transition: transform 0.25s ease;
}

.yf-totop-icon {
  display: block;
}

/* 手機分享按鈕（share.js 建立，只在文章頁、支援系統分享的觸控裝置出現）：「分享」下方以小字顯示總次數 */
.yf-share-fab {
  position: relative;
  flex-direction: column;
  gap: 1px;
  animation: yf-tool-in 0.35s cubic-bezier(0.2, 0.8, 0.3, 1.2) both;
  background: var(--color-sand);
  color: var(--forest-900);
}

/* 「分享」兩字：比其他按鈕的字略小，兩個字在 56px 圓內不擁擠 */
.yf-share-fab-label {
  font-size: 17px;
  letter-spacing: 0.08em;
  margin-right: -0.08em; /* 抵銷最後一字後的字距，視覺置中 */
}

.yf-share-fab-count {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
  opacity: 0.75;
}

.yf-share-fab-count::after {
  content: " 次";
}

.yf-share-fab-count[hidden] {
  display: none;
}

/* 分享成功：從按鈕上方飄出「+1」後淡出（文末按鈕也有，見 single-meta.css） */
.yf-share-plus {
  position: absolute;
  top: -6px;
  left: 50%;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--color-leaf);
  box-shadow: 0 3px 10px rgba(31, 42, 36, 0.3);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  pointer-events: none;
  animation: yf-plus-float 1.5s ease-out forwards;
}

@keyframes yf-plus-float {
  0% {
    opacity: 0;
    transform: translate(-50%, 8px) scale(0.6);
  }

  15% {
    opacity: 1;
    transform: translate(-50%, -14px) scale(1.1);
  }

  25% {
    transform: translate(-50%, -16px) scale(1);
  }

  70% {
    opacity: 1;
    transform: translate(-50%, -24px) scale(1);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -36px) scale(1);
  }
}


.yf-totop {
  background: var(--color-ink);
  font-size: 26px;
  transition: height 0.35s cubic-bezier(0.2, 0.8, 0.3, 1), margin-top 0.35s cubic-bezier(0.2, 0.8, 0.3, 1), border-width 0.35s, opacity 0.25s ease 0.1s, transform 0.35s cubic-bezier(0.2, 0.8, 0.3, 1.3) 0.05s, visibility 0s linear 0s, background-color 0.2s;
}

/* 回到頂端：未出現時高度為 0（並抵銷上方間距），出現時高度展開、淡入放大，上方按鈕平順往上讓位 */
.yf-totop:not(.is-shown) {
  height: 0;
  margin-top: -10px; /* 抵銷 .yf-tools 的 gap */
  border-width: 0;
  opacity: 0;
  transform: scale(0.6);
  visibility: hidden;
  pointer-events: none;
  transition-delay: 0s, 0s, 0s, 0s, 0s, 0.35s, 0s; /* 收起時：先縮小淡出，最後才 visibility: hidden */
}

/* 不套用 base.css 按鈕滑鼠移上去的半透明（深色按鈕會變灰） */
.yf-share-fab:hover,
.yf-fs-toggle:hover,
.yf-totop:hover,
.yf-fs-btn:hover,
.yf-fs-btn:active {
  opacity: 1;
}

.yf-tools.is-open .yf-fs-toggle {
  background: var(--color-ink);
}

.yf-share-fab:focus-visible,
.yf-fs-toggle:focus-visible,
.yf-totop:focus-visible,
.yf-fs-btn:focus-visible {
  outline: 3px solid #f1c75b;
  outline-offset: 2px;
}

@media (hover: hover) {
  .yf-share-fab:hover,
  .yf-fs-toggle:hover,
  .yf-totop:hover {
    transform: translateY(-2px);
    box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.12), 0 10px 22px rgba(31, 42, 36, 0.32);
  }
}

/* ---------- 微互動（開啟「減少動態效果」時全部關閉，見檔案最後） ---------- */

/* 按下：輕微縮小，手機上也有按到的回饋 */
.yf-share-fab:active,
.yf-fs-toggle:active,
.yf-totop:active {
  transform: scale(0.92);
  transition-duration: 0.08s;
}

/* 分享按鈕出現：由下浮起（頁面載入時；動畫套用在 .yf-share-fab） */
@keyframes yf-tool-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.9);
  }
}

/* 字級面板：從按鈕旁滑出，選項依序出現 */
@keyframes yf-panel-in {
  from {
    opacity: 0;
    transform: translateX(16px) scale(0.96);
  }
}

.yf-tools.is-open .yf-fs-btn {
  animation: yf-panel-in 0.25s cubic-bezier(0.2, 0.8, 0.3, 1) both;
}

.yf-tools.is-open .yf-fs-btn:nth-child(2) {
  animation-delay: 0.04s;
}

.yf-tools.is-open .yf-fs-btn:nth-child(3) {
  animation-delay: 0.08s;
}

/* AA 圖示：打開面板時，下方細線延伸，大 A 微微放大 */
.yf-tools.is-open .yf-fs-icon::after {
  transform: scaleX(1.15);
}

.yf-tools.is-open .yf-fs-icon-l {
  transform: scale(1.08);
}

/* 選定字級：按鈕輕彈一下 */
@keyframes yf-pick {
  50% {
    transform: scale(1.1);
  }
}

.yf-fs-btn.is-picked {
  animation: yf-pick 0.3s ease;
}

/* 分享完成：按鈕外圈擴散一圈沙色光暈 */
@keyframes yf-ripple {
  from {
    box-shadow: 0 0 0 0 rgba(201, 169, 110, 0.6), 0 6px 18px rgba(31, 42, 36, 0.28);
  }

  to {
    box-shadow: 0 0 0 18px rgba(201, 169, 110, 0), 0 6px 18px rgba(31, 42, 36, 0.28);
  }
}

.yf-share-fab.is-shared {
  animation: yf-ripple 0.7s ease-out;
}

.yf-fs {
  display: none;
  gap: 6px;
  padding: 8px;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 6px 20px rgba(31, 42, 36, 0.25);
}

.yf-tools.is-open .yf-fs {
  display: flex;
  animation: yf-panel-in 0.25s cubic-bezier(0.2, 0.8, 0.3, 1) both;
  transform-origin: right center;
}

.yf-fs-btn {
  min-width: 56px;
  min-height: 48px;
  padding: 0 14px;
  border: 1px solid var(--color-leaf);
  border-radius: 999px;
  background: #fff;
  color: var(--color-leaf);
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
}

.yf-fs-btn[data-size="m"] { font-size: 16px; }
.yf-fs-btn[data-size="l"] { font-size: 19px; }
.yf-fs-btn[data-size="xl"] { font-size: 22px; }

.yf-fs-btn[aria-pressed="true"] {
  background: var(--color-leaf);
  color: #fff;
}

/* 瀏覽數（share.js 加在工具最上方）：很小的兩行字，與按鈕同寬置中 */
.yf-views {
  min-width: 56px;
  margin: 0;
  padding: 3px 6px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.85);
  color: var(--color-ink);
  font-family: var(--font-serif);
  font-size: 11px;
  line-height: 1.3;
  text-align: center;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(31, 42, 36, 0.14);
  animation: yf-tool-in 0.35s cubic-bezier(0.2, 0.8, 0.3, 1.2) both;
}

/* 毛玻璃：保留各按鈕底色但改為半透明，背後內容霧化（不支援的瀏覽器維持上方實色）
   透明度保持在 75% 以上，白字對比仍足夠 */
@supports ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) and (background: color-mix(in srgb, red 50%, transparent)) {
  .yf-share-fab,
  .yf-fs-toggle,
  .yf-totop,
  .yf-fs {
    border-color: rgba(255, 255, 255, 0.55);
    -webkit-backdrop-filter: blur(5px) saturate(160%);
    backdrop-filter: blur(5px) saturate(160%);
  }

  .yf-share-fab,
  .yf-fs-toggle,
  .yf-totop {
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), inset 0 0 0 3px rgba(255, 255, 255, 0.08), 0 6px 18px rgba(31, 42, 36, 0.24);
  }

  .yf-fs-toggle {
    background: color-mix(in srgb, var(--color-leaf) 78%, transparent);
  }

  .yf-totop,
  .yf-tools.is-open .yf-fs-toggle {
    background: color-mix(in srgb, var(--color-ink) 75%, transparent);
  }

  .yf-share-fab {
    background: color-mix(in srgb, var(--color-sand) 80%, transparent);
  }

  .yf-views {
    background: rgba(255, 255, 255, 0.6);
    -webkit-backdrop-filter: blur(5px) saturate(160%);
    backdrop-filter: blur(5px) saturate(160%);
  }

  .yf-fs {
    border: 1px solid rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.62);
  }

  .yf-fs-btn:not([aria-pressed="true"]) {
    background: rgba(255, 255, 255, 0.55);
  }

  @media (hover: hover) {
    .yf-share-fab:hover,
    .yf-fs-toggle:hover,
    .yf-totop:hover {
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35), inset 0 0 0 3px rgba(255, 255, 255, 0.08), 0 10px 22px rgba(31, 42, 36, 0.3);
    }
  }
}

/* 燈箱或搜尋開啟時隱藏，避免擋住操作 */
html.yf-lightbox-open .yf-tools,
html.yf-search-open .yf-tools {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .yf-share-fab,
  .yf-fs-toggle,
  .yf-totop,
  .yf-fs-icon::after,
  .yf-fs-icon-l {
    transition: none;
  }

  .yf-tools *,
  .yf-tools *::after {
    animation: none !important;
  }

  .yf-share-fab:active,
  .yf-fs-toggle:active,
  .yf-totop:active {
    transform: none;
  }
}

@media print {
  .yf-tools {
    display: none;
  }
}