:root {
  color-scheme: light;

  --bg-page: #f4faf6;
  --bg-surface: #ffffff;
  --bg-card: #f2f9f5;
  --bg-soft: #e9f6ee;
  --bg-muted: #f5f5f4;
  --bg-strong: #f3f4f6;

  --text-strong: #1e1b1e;
  --text-normal: #44403c;
  --text-muted: #706e72;
  --text-subtle: #78716c;

  --border-soft: #c3e5d0;
  --border-normal: #e7e5e4;
  --border-strong: #948f89;

  --primary: #2f9e63;
  --primary-strong: #237f4e;
  --primary-soft: #edf9f2;

  --success: #16a34a;
  --success-strong: #15803d;
  --success-soft: #f0fdf4;

  --danger: #ffe4e6;
  --danger-strong: #9f1239;

  --warning: #fffbeb;
  --warning-strong: #b45309;

  --shadow-soft: rgba(27, 122, 74, 0.1);
  --shadow-card: rgba(0, 0, 0, 0.06);

  --button-white: #ffffff;
  --button-hover: #f5f5f4;
  --chip-active: #15803d;

  --on-primary: #ffffff;
  --on-success: #1e1b1e;
  --overlay-select: rgba(0, 123, 255, 0.4);
  --overlay-remove: rgba(220, 38, 38, 0.25);
  --disabled-bg: #cccccc;
  --disabled-text: #666666;
  --link: #0000ee;
  --link-hover: #551a8b;
  --switch-off: #d0d0d0;

  /* 麻將手牌/背紋 mask 濾鏡轉換 (原色 #f49829 -> 各主題色) */
  --tile-mask-filter: hue-rotate(103deg) saturate(0.76) brightness(0.8);
}

html[data-theme="pink"] {
  --primary: #fb8aa0;
  --primary-strong: #eb4c71;
  --primary-soft: #fff1f2;

  --bg-page: #fff8fa;
  --bg-card: #fff7f8;
  --bg-soft: #fff1f2;
  --border-soft: #fbcfe8;
  --shadow-soft: rgba(244, 63, 94, 0.08);

  --tile-mask-filter: hue-rotate(312deg) saturate(1.05) brightness(1.14);
}

html[data-theme="blue"] {
  --primary: #4a90d9;
  --primary-strong: #1f6bb0;
  --primary-soft: #e9f2fb;

  --bg-page: #f6f9fc;
  --bg-card: #f5f9fd;
  --bg-soft: #ecf4fb;
  --border-soft: #c8dff2;
  --shadow-soft: rgba(37, 121, 199, 0.1);

  --tile-mask-filter: hue-rotate(191deg) saturate(1.4) brightness(0.86);
}

html[data-theme="dark"] {
  color-scheme: dark;

  --primary: #f7d660;
  --primary-strong: #fbe49b;
  --primary-soft: #332b1a;

  --tile-mask-filter: hue-rotate(17deg) saturate(0.64) brightness(1.3);

  --bg-page: #151826;
  --bg-surface: #1c2131;
  --bg-card: #1f2537;
  --bg-soft: #252b3f;
  --bg-muted: #2a3147;
  --bg-strong: #303855;

  --text-strong: #f2f2f5;
  --text-normal: #c9ccd6;
  --text-muted: #999fae;
  --text-subtle: #8b91a0;

  --border-soft: #2e3448;
  --border-normal: #323950;
  --border-strong: #657094;

  --success: #3fbf74;
  --success-strong: #56d18a;
  --success-soft: #1d3328;

  --danger: #4a2430;
  --danger-strong: #ff8296;

  --warning: #3a3222;
  --warning-strong: #e8a33d;

  --shadow-soft: rgba(0, 0, 0, 0.4);
  --shadow-card: rgba(0, 0, 0, 0.45);

  --button-white: #252b3d;
  --button-hover: #2f374f;
  --chip-active: #4ad38a;

  --on-primary: #241d0e;
  --on-success: #10251b;
  --overlay-select: rgba(90, 160, 255, 0.45);
  --overlay-remove: rgba(255, 80, 100, 0.35);
  --disabled-bg: #333b52;
  --disabled-text: #9199ab;
  --link: #f7d660;
  --link-hover: #fbe49b;
  --switch-off: #363e58;
}

html[data-theme="dark"] body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(
      1px 1px at 8% 18%,
      rgba(255, 255, 255, 0.7) 50%,
      transparent 51%
    ),
    radial-gradient(
      1.4px 1.4px at 21% 64%,
      rgba(255, 255, 255, 0.5) 50%,
      transparent 51%
    ),
    radial-gradient(
      1px 1px at 32% 35%,
      rgba(255, 236, 180, 0.8) 50%,
      transparent 51%
    ),
    radial-gradient(
      1.6px 1.6px at 45% 82%,
      rgba(255, 255, 255, 0.6) 50%,
      transparent 51%
    ),
    radial-gradient(
      1px 1px at 56% 12%,
      rgba(255, 255, 255, 0.65) 50%,
      transparent 51%
    ),
    radial-gradient(
      2px 2px at 64% 48%,
      rgba(255, 224, 130, 0.85) 50%,
      transparent 51%
    ),
    radial-gradient(
      1px 1px at 74% 28%,
      rgba(255, 255, 255, 0.55) 50%,
      transparent 51%
    ),
    radial-gradient(
      1.2px 1.2px at 83% 70%,
      rgba(255, 255, 255, 0.6) 50%,
      transparent 51%
    ),
    radial-gradient(
      1px 1px at 91% 42%,
      rgba(255, 236, 180, 0.7) 50%,
      transparent 51%
    ),
    radial-gradient(
      1.3px 1.3px at 15% 88%,
      rgba(255, 255, 255, 0.5) 50%,
      transparent 51%
    ),
    radial-gradient(
      1px 1px at 40% 8%,
      rgba(255, 255, 255, 0.45) 50%,
      transparent 51%
    ),
    radial-gradient(
      1.5px 1.5px at 95% 86%,
      rgba(255, 224, 130, 0.6) 50%,
      transparent 51%
    );
}

@media (prefers-reduced-motion: no-preference) {
  html[data-theme="dark"] body::before {
    animation: theme-star-twinkle 7s ease-in-out infinite alternate;
  }
}

@keyframes theme-star-twinkle {
  from {
    opacity: 0.55;
  }
  to {
    opacity: 0.95;
  }
}

* {
  box-sizing: border-box;
}

/* 鍵盤導航焦點環 */
button:focus-visible,
a:focus-visible,
summary:focus-visible,
input[type="radio"]:focus-visible,
input[type="checkbox"]:focus-visible {
  outline: 2px solid var(--primary-strong);
  outline-offset: 2px;
}

/* 文字/數字輸入框：聚焦時直接改自身邊框顏色 */
input[type="text"]:focus-visible,
input[type="number"]:focus-visible {
  outline: none;
  border-color: var(--primary-strong);
  box-shadow: 0 0 0 1px var(--primary-strong) inset;
}

body {
  font-family: "Segoe UI", sans-serif;
  background-color: var(--bg-page);
  padding: 40px;
  max-width: 1024px;
  margin: auto;
  color: var(--text-normal);
}

h1 {
  text-align: center;
  color: var(--text-strong);
}

.section {
  margin-top: 30px;
}

.main-label {
  display: block;
  font-weight: bold;
  margin-bottom: 8px;
}

.input-area {
  margin-bottom: 10px;
}

input[type="text"] {
  width: 100%;
  padding: 10px;
  font-size: 16px;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
}

.input-note-wrapper {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 5px;
}

.output-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-soft);
  padding: 15px;
  margin-top: 20px;
  border-radius: 10px;
  box-shadow:
    0 2px 8px var(--shadow-card),
    0 6px 20px var(--shadow-soft);
}

.output-title {
  font-weight: bold;
  margin-bottom: 10px;
  color: var(--text-strong);
  display: inline-flex;
  align-items: center;
  white-space: pre-wrap;
}

.output-context {
  white-space: pre-wrap;
  word-wrap: break-word;
}

.output-time {
  font-size: 14px;
  color: var(--text-muted);
  font-style: italic;
}

.output-context .card-container {
  text-align: left;
}

.output-context .card-container .card-div {
  width: 30px;
}

.output-context .card-container .card-padding {
  width: 10px;
}

.waiting-brief {
  vertical-align: top;
  white-space: nowrap;
  padding-left: 0px;
}

.devided-waiting-td {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0px 5px;
}

.devided-waiting-container {
  display: flex;
  white-space: nowrap;
  gap: 0px 5px;
}

.devided-waiting-brief {
  white-space: nowrap;
  display: inline-block;
}

.devided-waiting-cards {
  white-space: normal;
  display: inline-block;
}

.primary-button,
.random-button {
  margin-bottom: 10px;
  padding: 10px 20px;
  font-size: 15px;
  border: 1.5px solid;
  border-radius: 8px;
  cursor: pointer;
  width: 200px;
}

.primary-button {
  font-weight: 600;
  background-color: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
  transition:
    background-color 0.15s,
    transform 0.1s;
}

.primary-button:hover {
  background-color: var(--primary-strong);
  border-color: var(--primary-strong);
}

.primary-button:active {
  transform: translateY(1px);
}

.random-button {
  font-weight: 500;
  background: var(--button-white);
  color: var(--text-normal);
  border-color: var(--border-strong);
  align-items: center;
  transition:
    border-color 0.15s,
    box-shadow 0.15s;
}

.random-button:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--shadow-soft);
}

.random-button input {
  width: 5ch;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  background: var(--bg-muted);
}

html {
  overflow-y: scroll;
}

.toggle-button {
  background: none;
  border: none;
  font-weight: bold;
  cursor: pointer;
  margin-bottom: 8px;
  padding: 0;
  white-space: nowrap;
}

.toggle-button--action {
  color: var(--primary-strong);
}

.toggle-button--success {
  color: var(--primary-strong);
}

.toggle-button:hover {
  text-decoration: underline;
}

.title-button-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-container {
  text-align: center;
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
  max-width: 100%;
  user-select: none;
  padding-top: 10px; /* 為懸浮抬起預留 10px 的頂部空間 */
  margin-top: -10px; /* 抵消頂部高度，防止擠壓版面 */
}

.card-div,
.kong-container {
  position: relative;
  display: inline-block;
  vertical-align: bottom;
  user-select: none;
}

.card-div {
  aspect-ratio: 80 / 129;
  transition:
    transform 0.2s cubic-bezier(0.25, 0.8, 0.25, 1),
    filter 0.2s ease;
}

.card-div.rotated-tile {
  aspect-ratio: 118 / 91;
}

.card-div:empty {
  aspect-ratio: auto;
}

.kong-container {
  aspect-ratio: 118 / 168;
}

.kong-container > .card-div:first-child {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 2 !important;
}

.kong-container > .card-div:last-child {
  position: absolute;
  top: 45.833333%;
  left: 0;
  width: 100%;
  z-index: 1 !important;
}

.card-div img {
  display: block;
  width: 100%;
  height: 100%;
}

.card-div .clickable {
  cursor: pointer;
}

.card-div:has(.card-overlay) {
  z-index: 1;
}

.card-div .card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--overlay-select);
  opacity: 0;
  pointer-events: none;
  z-index: 20;
}

.card-div .card-img-overlay,
.card-div .card-img-overlay-r,
.card-div .card-tile-mask {
  position: absolute;
  pointer-events: none;
}

.card-div .card-tile-mask {
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  filter: var(--tile-mask-filter);
  z-index: 1;
}

.card-div .card-img-overlay,
.card-div .card-img-overlay-r,
.card-div [class*="card-img-overlay"] {
  z-index: 2;
}

.card-div .card-img-overlay-r {
  transform-origin: left top;
  transform: rotate(270deg);
}

.card-div .card-img-overlay {
  top: 16.795866%;
  left: 3.750000%;
  width: 92.500000%;
  height: 76.485788%;
}

.card-div .card-img-overlay-r {
  top: 97.802198%;
  left: 8.192090%;
  width: 62.711864%;
  height: 108.424908%;
}

.card-div .card-img-overlay-nikki {
  top: 9.344228% !important;
  left: 1.250000% !important;
  width: 97.500000% !important;
  height: 89.880578% !important;
}

.card-div .card-img-overlay-nikki-r {
  top: 98.901099% !important;
  left: 0.870362% !important;
  width: 66.101695% !important;
  height: 127.413127% !important;
}

.card-div .card-img-overlay-saki-zenkoku {
  top: 15.906380% !important;
  left: 6.250000% !important;
  width: 87.500000% !important;
  height: 78.264758% !important;
}

.card-div .card-img-overlay-saki-zenkoku-r {
  top: 95.604396% !important;
  left: 7.219687% !important;
  width: 59.322034% !important;
  height: 110.946746% !important;
}

.card-div div[class*="card-img-overlay"] {
  display: grid;
  gap: 0;
  padding: 0;
  box-sizing: border-box;
}

.card-div div[class*="card-img-overlay"] img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
}

/* 1 張圖：填滿，完全還原原始單圖效果 */
.card-div div[class*="card-img-overlay"]:has(> img:only-child) {
  display: block;
}

/* 4 張圖：自動 2x2 排列 */
.card-div div[class*="card-img-overlay"]:has(> img:nth-child(4)) {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
}

/* 3 張圖：自動 1+2 排列（上 1 居中，下 2 並排） */
.card-div div[class*="card-img-overlay"]:has(> img:nth-child(3)):not(:has(> img:nth-child(4))) {
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: 1fr 1fr;
  grid-template-areas:
    ". a a ."
    "b b c c";
}

.card-div div[class*="card-img-overlay"]:has(> img:nth-child(3)):not(:has(> img:nth-child(4))) img:nth-child(1) {
  grid-area: a;
}

.card-div div[class*="card-img-overlay"]:has(> img:nth-child(3)):not(:has(> img:nth-child(4))) img:nth-child(2) {
  grid-area: b;
}

.card-div div[class*="card-img-overlay"]:has(> img:nth-child(3)):not(:has(> img:nth-child(4))) img:nth-child(3) {
  grid-area: c;
}

@media (width > 512px) {
  .card-div:has(.card-overlay):hover,
  .card-div.backspace-hover,
  .card-div.hover-preview-meld,
  .card-div.hover-preview-transfer,
  .card-div.hover-preview-sort,
  .meld-group.closed-meld:hover .card-div,
  .meld-group.open-meld:has(.rotated-tile:hover) .card-div {
    transform: translateY(-6px);
    filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.3));
    z-index: 10;
  }

  .input-card-button:hover {
    transform: translateY(-5px);
    filter: drop-shadow(0 6px 8px rgba(0, 0, 0, 0.25)) brightness(1.05);
  }

  .card-div:has(.card-overlay):active,
  .meld-group.closed-meld:active .card-div,
  .meld-group.open-meld:has(.rotated-tile:active) .card-div,
  .input-card-button:active {
    transform: translateY(-1px);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
    transition:
      transform 0.05s ease,
      filter 0.05s ease;
  }

  .card-div:hover .card-overlay,
  .card-div.backspace-hover .card-overlay,
  .card-div.hover-preview-meld .card-overlay,
  .card-div.hover-preview-transfer .card-overlay,
  .card-div.hover-preview-sort .card-overlay,
  .meld-group.closed-meld:hover .card-overlay,
  .meld-group.open-meld:has(.rotated-tile:hover) .card-overlay {
    opacity: 1 !important;
    transition: opacity 0.2s ease;
  }

  .card-div.removable-tile .card-overlay,
  .card-div.backspace-hover .card-overlay,
  .meld-group.closed-meld:hover .card-overlay,
  .meld-group.open-meld:has(.rotated-tile:hover) .card-overlay {
    background-color: var(--overlay-remove) !important;
    border-radius: 4px;
  }

  .card-div.hover-preview-meld .card-overlay,
  .card-div.hover-preview-transfer .card-overlay,
  .card-div.hover-preview-sort .card-overlay {
    background-color: var(--overlay-select) !important;
  }

  #output-pic .card-div:hover .card-overlay::after,
  .card-div.removable-tile .card-overlay::after,
  .card-div.backspace-hover .card-overlay::after,
  .card-div.hover-preview-meld .card-overlay::after,
  .card-div.hover-preview-transfer .card-overlay::after,
  .card-div.hover-preview-sort .card-overlay::after,
  .meld-group.closed-meld:hover .card-overlay::after,
  .meld-group.open-meld:has(.rotated-tile:hover) .card-overlay::after,
  .meld-group.open-meld
    .card-div:not(.rotated-tile):hover
    .card-overlay::after {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 20px;
    font-weight: bold;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
  }

  #output-pic .card-div:hover .card-overlay::after {
    content: "⇅";
  }
  .card-div.removable-tile .card-overlay::after,
  .card-div.backspace-hover .card-overlay::after,
  .meld-group.closed-meld:hover .card-overlay::after,
  .meld-group.open-meld:has(.rotated-tile:hover) .card-overlay::after {
    content: "×";
  }
  .card-div.hover-preview-meld .card-overlay::after {
    content: "→";
  }
  .card-div.hover-preview-transfer .card-overlay::after {
    content: "↓";
  }
  .card-div.hover-preview-sort .card-overlay::after {
    content: "⇄";
  }
  .meld-group.open-meld
    .card-div:not(.rotated-tile):hover
    .card-overlay::after {
    content: "↻";
  }

  #input-pic-dorap .card-div:not(.removable-tile),
  #input-pic-urap .card-div:not(.removable-tile) {
    pointer-events: none;
  }
}

.meld-group {
  display: inline-block;
  vertical-align: bottom;
  white-space: nowrap;
}

.ghost-tile {
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.15s ease,
    transform 0.2s ease;
}

.ghost-tile.hover-preview-meld,
.ghost-tile.hover-preview-transfer {
  opacity: 0.3;
}

.card-helper,
.card-helper-r {
  position: absolute;
  color: red;
  font-weight: bold;
  padding: 0;
  user-select: none;
  pointer-events: none;
  z-index: 3;
  text-shadow:
    -1px -1px 0 white,
    0px -1px 0 white,
    1px -1px 0 white,
    -1px 0px 0 white,
    1px 0px 0 white,
    -1px 1px 0 white,
    0px 1px 0 white,
    1px 1px 0 white;
}

.card-helper {
  top: 0.35em;
  left: 0.2em;
}

.card-helper.card-helper-right {
  left: auto;
  right: 0.2em;
}

.card-helper-r.card-helper-right {
  text-align: right;
}

.card-helper-r {
  display: block;
  text-align: left;
  transform-origin: left top;
  transform: rotate(270deg);
  top: 94.945055%;
  left: -3.728814%;
  width: 58.305085%;
  height: 139.340659%;
}

.input-area .card-container {
  position: relative;
  border: none;
  background-color: transparent;
}

.input-area .card-container::before {
  content: "";
  position: absolute;
  top: 10px; /* 往下偏移 10px，形成視覺邊框，空出頂部 */
  left: 0;
  right: 0;
  bottom: 0;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  background-color: var(--bg-surface);
  z-index: -1; /* 置於卡片下方 */
  pointer-events: none;
}

#input-pic::after {
  content: "";
  display: inline-block;
  height: 100%;
  vertical-align: bottom;
}

.input-keyboard {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 10px;
  width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.input-mainkey {
  width: 400px;
}

.input-row {
  display: flex;
  justify-content: space-between;
  margin-top: 1%;
}

.input-mainkey .card-container {
  text-align: right;
  margin-top: calc(1% - 10px);
}

.input-card-button {
  width: 7.5%;
  cursor: pointer;
  transition:
    transform 0.2s cubic-bezier(0.25, 0.8, 0.25, 1),
    filter 0.2s ease;
}

.input-subkeys {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  margin-top: 5px;
}

.subkey-button {
  margin-bottom: 0px;
  padding: 5px 0px;
  font-size: 16px;
  background-color: var(--primary);
  color: var(--on-primary);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  width: 80px;
  align-items: center;
}

.subkey-button:hover:not(:disabled) {
  background-color: var(--primary-strong);
}

.subkey-button:disabled {
  background-color: var(--disabled-bg);
  color: var(--disabled-text);
  cursor: not-allowed;
}

.win-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  width: 100%;
  padding: 0;
  align-items: center;
}

.language-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap; /* 寬度不足時自動換行，保持左右佈局 */
  gap: 6px 12px;
  width: 100%;
  margin-bottom: 25px;
  padding: 12px 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  box-shadow: 0 4px 12px var(--shadow-soft);
}

.custom-select {
  position: relative;
  display: inline-block;
  user-select: none;
}

.select-trigger {
  display: inline-flex;
  align-items: center;
  height: 30px; /* 與語言膠囊高度一致，統一基準線 */
  background: var(--bg-soft);
  color: var(--text-strong);
  border: 1px solid var(--border-soft);
  padding: 0 36px 0 18px; /* 垂直置 0，水平保留空間給箭頭 */
  border-radius: 999px;
  font-family: inherit;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 500;
  line-height: 1;
  position: relative;
  text-align: left;
}

.select-trigger::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  border: 4.5px solid transparent;
  border-top-color: var(--text-subtle);
  transition: transform 0.2s ease;
}

.custom-select.open .select-trigger::after {
  transform: translateY(-75%) rotate(180deg);
}

.select-options {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 170px;
  background: var(--bg-surface);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  box-shadow: 0 10px 25px var(--shadow-soft);
  display: none;
  z-index: 1000;
  padding: 6px;
}

.custom-select.open .select-options {
  display: block;
}

.select-option {
  padding: 8px 14px;
  font-size: 13.5px;
  color: var(--text-normal);
  border-radius: 8px;
  cursor: pointer;
  transition:
    background 0.15s ease,
    color 0.15s ease;
}

.select-option:hover {
  background: var(--primary-soft);
  color: var(--primary-strong);
}

.select-option.selected {
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 600;
}

.lang-group {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  margin-left: auto; /* 始終靠右，換行後也在右側 */
}

.lang-group a {
  display: inline-flex;
  align-items: center; /* 文字在固定高度膠囊內垂直置中 */
  height: 30px; /* 固定高度，確保所有語言膠囊一致 */
  line-height: 1;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--text-subtle);
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
}

.lang-group a:hover,
.lang-group a.active {
  color: var(--primary-strong);
  background: var(--primary-soft);
}

.theme-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 16px;
}

.theme-dot {
  position: relative;
  width: 20px;
  height: 20px;
  padding: 0;
  border-radius: 50%;
  border: 2px solid var(--border-normal);
  background: var(--dot-color);
  cursor: pointer;
  transition:
    transform 0.15s ease,
    border-color 0.15s ease;
}

.theme-dot:hover {
  transform: scale(1.15);
}

.theme-dot.active {
  border-color: var(--text-strong);
  box-shadow: inset 0 0 0 2px var(--bg-surface);
}

.theme-dot[data-theme="pink"] {
  --dot-color: #fb8aa0;
}

.theme-dot[data-theme="green"] {
  --dot-color: #2f9e63;
}

.theme-dot[data-theme="blue"] {
  --dot-color: #4a90d9;
}

.theme-dot[data-theme="dark"] {
  --dot-color: #23262e;
}

.output-options {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0px 10px;
  align-items: top;
}

.output-grid-div {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0px 10px;
  align-items: top;
}

.output-option-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0px 10px;
}

.output-option-group div {
  white-space: nowrap;
  flex-shrink: 1;
  max-width: 100%;
  min-width: 0;
  overflow-wrap: break-word;
  word-break: break-word;
}

.output-option-group input[type="number"] {
  width: 5ch;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
}

input[type="radio"],
input[type="checkbox"] {
  margin: 3px 3px 3px 3px;
}

.score-button {
  margin-top: 10px;
  margin-bottom: 10px;
  cursor: pointer;
}

.output-box-head {
  display: none;
  position: sticky;
  top: 0;
  background: var(--bg-page);
  z-index: 1000;
}

.reference-sup {
  display: inline;
  font-size: 0.7em;
  vertical-align: super;
  cursor: pointer;
}
.reference-box {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 1em;
  padding-top: 0.5em;
}
.reference-box details {
  width: 100%;
}
.reference-box summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text-normal);
  user-select: none;
  font-size: 14px;
}
.reference-box summary:hover {
  color: var(--primary-strong);
}
.reference-box ul {
  list-style: none;
  padding-left: 0;
}
.reference-box li {
  position: relative;
  padding-left: 1.5em;
}
.reference-box ul li::before {
  content: "🔗";
  display: inline-block;
  font-size: 100%;
  position: absolute;
  left: 0;
  top: 0;
}
.reference-box a {
  color: inherit;
  text-decoration: none;
}
.reference-box .small-a {
  font-size: 80%;
  color: var(--text-subtle);
  position: relative;
  padding-left: 1em;
}
.reference-box .small-a::before {
  content: "";
  display: inline-block;
  width: 1em;
  height: 1em;
  margin-right: 0em;
  background: url("./Icon_External_Link.svg") no-repeat center / contain;
  position: absolute;
  top: 2px;
  left: 0;
}

.reference-table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin-top: 10px;
  border: 1px solid var(--border-normal);
  border-radius: 8px;
  box-shadow: 0 1px 3px var(--shadow-card);
}

.reference-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-surface);
  text-align: left;
}

.reference-table th,
.reference-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-normal);
  vertical-align: middle;
  white-space: nowrap;
}

.reference-table th:nth-child(2),
.reference-table td:nth-child(2) {
  white-space: normal;
  word-break: normal;
  overflow-wrap: break-word;
}

.reference-table th {
  background-color: var(--bg-muted);
  color: var(--text-normal);
  font-weight: 600;
  font-size: 13.5px;
}

.reference-table td {
  font-size: 13px;
  color: var(--text-normal);
}

.reference-table tr:last-child td {
  border-bottom: none;
}

.reference-table tr:hover td {
  background-color: var(--bg-card);
}

.reference-table a {
  color: var(--primary-strong);
  text-decoration: none;
  font-weight: 500;
}

.reference-table a:hover {
  text-decoration: underline;
}

.reference-table .small-a {
  font-size: 80%;
  color: var(--text-subtle);
  position: relative;
  padding-left: 1.2em;
  margin-left: 8px;
  display: inline-block;
}

.reference-table .small-a::before {
  content: "";
  display: inline-block;
  width: 1em;
  height: 1em;
  background: url("./Icon_External_Link.svg") no-repeat center / contain;
  position: absolute;
  top: 2px;
  left: 0;
}

.reference-table .external-link {
  position: relative;
  padding-left: 1.2em;
  display: inline-block;
}

.reference-table .external-link::before {
  content: "";
  display: inline-block;
  width: 1em;
  height: 1em;
  background: url("./Icon_External_Link.svg") no-repeat center / contain;
  position: absolute;
  top: 2px;
  left: 0;
}

.mobile-display-only {
  display: block;
}

.fan {
  font-style: italic;
  font-size: small;
}
.switch {
  --h: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  width: var(--w);
  height: var(--h);
  border-radius: 999px;
  background: var(--switch-off);
  border: none;
  padding: 0 4px;
  cursor: pointer;
  position: relative;
  font-size: 12px;
  color: var(--text-strong);
  user-select: none;
  margin-left: 10px;
}
.switch .label-text {
  z-index: 2;
  padding: 0 0.3em;
}
.switch .thumb {
  width: calc(var(--h) - 4px);
  height: calc(var(--h) - 4px);
  border-radius: 50%;
  background: var(--button-white);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
  transition: transform 180ms cubic-bezier(0.2, 0.9, 0.3, 1);
  z-index: 1;
}
.switch.on {
  background: var(--success);
  color: var(--on-success);
}
.switch.on .thumb {
  transform: translateX(calc(var(--w) - var(--h)));
}

.cmp-word-long {
  display: inline;
}
.cmp-word-short {
  display: none;
}

.output-box .tabs {
  position: sticky;
  top: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  margin: -15px -15px 16px -15px;
  padding: 3px 5px 0px 5px;
  border-bottom: 2px solid var(--border-normal);
  background: transparent;
  border-radius: 10px 10px 0 0;
}

.output-box .tab {
  padding: 9px 14px;
  margin-bottom: -2px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  cursor: pointer;
  color: var(--text-subtle);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition:
    color 0.15s,
    border-color 0.15s;
}

.output-box .tab:hover {
  color: var(--primary-strong);
}

.output-box .tab:not(.active) {
  background: none;
}

.output-box .tab.active {
  color: var(--primary-strong);
  font-weight: 600;
  border-bottom: 2px solid var(--primary-strong);
}

.output-box .tab:focus:not(:focus-visible) {
  outline: none;
}

.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
}

.text-link-btn {
  color: var(--link);
  font-size: 0.8em;
  cursor: pointer;
  text-decoration: underline;
  user-select: none;
  vertical-align: sub;
}
.text-link-btn:hover {
  color: var(--link-hover);
}

@media (width <= 512px) {
  body {
    padding: 6px;
  }

  .section {
    margin-top: 15px;
  }

  h1 {
    font-size: 24px;
  }

  input[type="text"] {
    font-size: 16px;
  }

  .primary-button,
  .random-button {
    width: 100%;
    padding: 12px;
    font-size: 15px;
  }

  .output-box {
    padding: 9px;
    padding-right: 0px;
  }

  .output-box .toggle-button {
    padding-right: 9px;
  }

  .output-title {
    font-size: 16px;
  }

  .output-context {
    font-size: 16px;
  }

  .output-time {
    font-size: 12px;
  }

  .win-grid {
    display: block;
  }

  .output-context .card-container .card-div {
    width: 5.5%;
  }

  .output-context .card-container .card-padding {
    width: 1%;
  }

  .input-keyboard {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .input-mainkey {
    width: 100%;
  }

  .input-subkeys {
    margin-top: 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .reference-sup {
    display: inline;
  }
  .reference-box {
    font-size: 12px;
  }
  .reference-table th,
  .reference-table td {
    padding: 8px 4px;
    font-size: 12px;
  }
  .reference-table .external-link,
  .reference-table .small-a {
    padding-left: 0;
  }
  .reference-table .external-link::before,
  .reference-table .small-a::before {
    display: none;
  }
  .mobile-display-only {
    display: block;
  }

  .output-options > *:nth-child(even) {
    padding-left: 20px;
    grid-column: 1 / -1;
  }

  .cmp-word-long {
    display: none;
  }
  .cmp-word-short {
    display: inline;
  }

  .output-box .tabs {
    margin: -9px 0 12px -9px;
    padding: 0;
    flex-wrap: wrap;
  }

  .output-box .tab {
    font-size: 12px;
    padding: 7px 8px;
  }

  .card-container {
    overflow-x: auto; /* 行動端保持滾動，防止頁面寬度溢出 */
  }

  /* 語言導航欄：行動端縮小內距，換行由 flex-wrap 自動處理 */
  .language-bar {
    padding: 8px 12px;
    margin-bottom: 12px;
    gap: 6px 0;
  }

  .lang-group a {
    padding: 0 10px; /* 固定高度不需垂直 padding */
    font-size: 12.5px;
  }

  .reference-table.abbr-wrap th:nth-child(1),
  .reference-table.abbr-wrap td:nth-child(1) {
    white-space: normal;
    word-break: normal;
    overflow-wrap: break-word;
  }
}