:root {
  color-scheme: light dark;
  --page-background: #f5f3ee;
  --surface: #fcfbf7;
  --surface-muted: #f0ede6;
  --surface-strong: #ebe7de;
  --text-primary: #1d1c19;
  --text-secondary: #57524a;
  --border-subtle: #d2ccc2;
  --border-strong: #7d776e;
  --accent: #24211b;
  --accent-contrast: #fffdf8;
  --focus-ring: #111;
  --link: #3d3a34;
  --link-hover: #000;
  --candidate-highlight: #dfebe4;
  --marking: #e4efeb;
  --danger: #7a1f1f;
  --shadow-flat: none;
  --radius-sm: 6px;
  --radius-md: 12px;
  --spacing-1: 0.375rem;
  --spacing-2: 0.75rem;
  --spacing-3: 1rem;
  --spacing-4: 1.5rem;
  --spacing-5: 2rem;
  --panel-min-height: 37rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page-background: #111311;
    --surface: #181b18;
    --surface-muted: #202420;
    --surface-strong: #272c27;
    --text-primary: #f2f0ea;
    --text-secondary: #c2bdb1;
    --border-subtle: #42473f;
    --border-strong: #8f978b;
    --accent: #f2f0ea;
    --accent-contrast: #141613;
    --focus-ring: #f2f0ea;
    --link: #d6d1c6;
    --link-hover: #fffdf8;
    --candidate-highlight: #2e3a31;
    --marking: #2d3830;
    --danger: #ff7f7f;
  }

  textarea {
    caret-color: var(--text-primary);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--page-background);
  color: var(--text-primary);
  font-family: 'Iansui', 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', system-ui, sans-serif;
  font-size: 14pt;
  line-height: 1.55;
  overflow: auto;
}

body {
  padding: var(--spacing-3);
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.14em;
}

a:hover {
  color: var(--link-hover);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

h1,
h2,
p,
ul,
li {
  margin-top: 0;
}

h1 {
  margin-bottom: var(--spacing-2);
  font-size: 1.6rem;
}

h2 {
  margin-bottom: var(--spacing-2);
  font-size: 1.1rem;
  font-weight: 600;
}

p,
li,
small {
  color: var(--text-secondary);
  font-size: 10.5pt;
}

ul {
  margin-bottom: var(--spacing-2);
  padding-left: 1.3rem;
}

li {
  margin-bottom: 0.35rem;
}

td {
  margin: 0;
  border: 0;
  vertical-align: top;
}

.main {
  max-width: 1320px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

#loading {
  position: absolute;
  top: var(--spacing-2);
  left: var(--spacing-3);
  display: block;
  margin: 0;
  padding: var(--spacing-2) var(--spacing-3);
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
}

.left,
.right {
  width: 100%;
}

.left {
  min-height: 0;
}

.right {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--spacing-3);
  overflow: visible;
  user-select: none;
}

.right details {
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--spacing-2);
  margin-top: var(--spacing-2);
}

.right details:first-of-type {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}

.right summary {
  cursor: pointer;
  list-style: none;
  color: var(--text-primary);
  font-size: 14pt;
  font-weight: 600;
  margin-bottom: var(--spacing-1);
}

.right summary::-webkit-details-marker {
  display: none;
}

.right summary::before {
  content: '+';
  display: inline-block;
  width: 1.2em;
  color: var(--text-secondary);
}

.right details[open] summary::before {
  content: '−';
}

select,
button,
input[type='button'],
input[type='text'],
textarea {
  font: inherit;
}

.right select,
button,
input[type='button'],
input[type='text'] {
  min-height: 2.4rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-primary);
  padding: 0.35rem 0.7rem;
}

.right select {
  width: 100%;
  margin-bottom: var(--spacing-2);
}

#input-table-select {
  font-size: 18pt;
}

button,
input[type='button'] {
  cursor: pointer;
}

button:hover,
input[type='button']:hover {
  background: var(--surface-muted);
}

input[type='checkbox'],
input[type='radio'] {
  accent-color: var(--accent);
}

#edit_area {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: min(70vh, var(--panel-min-height));
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: var(--spacing-2);
  overflow: auto !important;
}

textarea {
  width: 100%;
  padding: 0.8rem 0.9rem;
  resize: none;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-primary);
  font-size: 14pt;
}

textarea:focus {
  border-color: var(--border-strong);
  outline: none;
}

textarea#text_area {
  flex-grow: 1;
  margin: 0;
  min-height: 20rem;
  border: 0;
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-primary);
  font-family: 'Iansui', 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  font-size: 28px;
  line-height: 1.35;
  ime-mode: disabled;
  -webkit-ime-mode: disabled;
  -moz-ime-mode: disabled;
  -ms-ime-mode: disabled;
}

textarea#text_area::placeholder {
  color: var(--text-secondary);
}

textarea#text_area:focus {
  border: 0;
  outline: none;
}

textarea#text_area:focus ~ * #edit_area,
#edit_area:has(textarea#text_area:focus) {
  border-color: var(--focus-ring);
}

#function {
  position: absolute;
  padding: var(--spacing-2) 0 0 var(--spacing-2);
  color: var(--text-primary);
  visibility: hidden;
  z-index: 10;
}

#composing_buffer p {
  display: inline-block;
  margin-top: -0.25rem;
  margin-bottom: var(--spacing-2);
  padding: 0.35rem 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14pt;
}

#candidates {
  float: left;
  padding: 0.25rem 0.4rem;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.candidate {
  padding: 2px 8px 2px 0 !important;
  font-size: 12pt !important;
}

.description {
  padding: 2px 10px 0 16px !important;
  font-size: 10pt !important;
  color: var(--text-secondary) !important;
}

.keycap {
  font-weight: 700;
  font-size: 10pt;
  color: var(--text-secondary);
  padding: 2px 10px 0 12px !important;
}

#candidates td {
  color: var(--text-primary);
  font-size: 12pt;
  padding: 2px;
}

.highlighted_candidate {
  background: var(--candidate-highlight);
  font-weight: 700;
}

.cursor {
  color: var(--danger);
  animation: blink 0.9s step-end infinite;
}

.marking {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  background: var(--marking);
}

.page_info {
  font-size: 10pt;
  color: var(--text-secondary);
  text-align: right;
}

.page_info td {
  padding-top: var(--spacing-2) !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

@media (min-width: 900px) {
  html,
  body {
    height: 100%;
    overflow: hidden;
  }

  .main {
    height: calc(100vh - 2 * var(--spacing-3));
    overflow: hidden;
  }

  .left,
  .right {
    min-height: 0;
  }

  .left {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
  }

  .main {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(18rem, 0.9fr);
    grid-template-rows: minmax(0, 1fr);
    align-items: stretch;
  }

  .right {
    height: 100%;
    max-height: 100%;
    overflow: auto !important;
  }

  #edit_area {
    flex: 1 1 auto;
    min-height: 0;
    height: 100%;
  }
}

.credit {
  margin: 0;
  padding: 0 var(--spacing-1);
  font-size: 10pt;
  color: var(--text-secondary);
}

.simple-keyboard {
  min-height: 230px;
  margin-top: var(--spacing-2);
  padding: 0;
  background: var(--surface-muted);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.hg-theme-default {
  background: transparent !important;
}

.hg-button {
  color: var(--text-primary) !important;
  background: var(--surface) !important;
  border: 1px solid var(--border-subtle) !important;
  box-shadow: none !important;
}

.hg-standardBtn {
  font-size: 26pt;
}

.hg-button[data-skbtn='{ctrl}'] {
  flex-grow: 1 !important;
  max-width: 80px;
}

.hg-button[data-skbtn='{alt}'] {
  flex-grow: 1 !important;
  max-width: 80px;
}

.hg-button-active {
  background: var(--accent) !important;
  color: var(--accent-contrast) !important;
}

#tooltip {
  float: left;
  padding: 0.35rem 0.6rem;
  background: var(--surface-strong);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  visibility: hidden;
}

.tag-line {
  font-size: 0.7em;
  color: var(--text-secondary);
}