:root {
  --color-paper: #f4f1e8;
  --color-paper-deep: #ece7d9;
  --color-ink: #1c1b18;
  --color-ink-soft: #6b665b;
  --color-line: #d9d3c3;
  --color-accent: #d8442a;
  --color-accent-deep: #b0331d;
  --color-mark: #e0a92e;
  --font-display: Inter, Noto Sans TC, sans-serif;
  --font-body: Inter, Noto Sans TC, sans-serif;
  --font-mono: Inter, Noto Sans TC, sans-serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

.tool-intro {
  max-width: 68ch;
  margin-block: 24px 40px;
  color: #6b665b;
}
.tool-intro code {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  padding: 1px 4px;
  background: #ece7d9;
  border-radius: 2px;
}

.regex-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.regex-delim {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1.75rem;
  color: #6b665b;
  user-select: none;
}

.regex-pattern-input {
  flex: 1 1 320px;
  min-width: 0;
  padding: 16px;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  color: #1c1b18;
  background: #f4f1e8;
  border: 1.5px solid #1c1b18;
  border-radius: 2px;
  box-shadow: 6px 6px 0 rgba(28, 27, 24, 0.12);
  transition: border-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.regex-pattern-input::placeholder {
  color: #6b665b;
}
.regex-pattern-input:focus {
  outline: none;
  border-color: #d8442a;
}

.regex-flags {
  display: flex;
  gap: 8px;
}

.pattern-status {
  min-height: 1.4em;
  margin: 8px 0 0;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  color: #6b665b;
}
.pattern-status.is-invalid {
  color: #d8442a;
}

.quick-pattern-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-chip {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.04em;
  padding: 4px 16px;
  border: 1px solid #d9d3c3;
  border-radius: 2px;
  color: #6b665b;
  background: transparent;
  cursor: pointer;
  transition: color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1), border-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1), background-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.filter-chip:hover {
  color: #1c1b18;
  border-color: #1c1b18;
}
.filter-chip.is-active {
  color: #f4f1e8;
  background: #d8442a;
  border-color: #d8442a;
}

.editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 16px;
}

.editor-toolbar-label {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: #6b665b;
  font-variant-numeric: tabular-nums;
}

.editor-toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.text-area {
  width: 100%;
  min-height: 200px;
  padding: 24px;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: #1c1b18;
  background: #f4f1e8;
  border: 1.5px solid #1c1b18;
  border-radius: 2px;
  box-shadow: 6px 6px 0 rgba(28, 27, 24, 0.12);
  resize: vertical;
  transition: border-color 0.4s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.text-area::placeholder {
  color: #6b665b;
}
.text-area:focus {
  outline: none;
  border-color: #d8442a;
}

.regex-result-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.regex-stat {
  margin: 0;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.03em;
  color: #d8442a;
}

.copy-hint {
  min-height: 1.4em;
  margin: 8px 0 0;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  color: #d8442a;
}

.regex-highlight {
  padding: 24px;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  line-height: 1.85;
  white-space: pre-wrap;
  word-break: break-word;
  color: #1c1b18;
  background: #f4f1e8;
  border: 1.5px solid #1c1b18;
  border-radius: 2px;
  overflow: auto;
  max-height: 400px;
}

.regex-match {
  background: color-mix(in srgb, #d8442a 18%, transparent);
  color: #b0331d;
  border-radius: 2px;
  box-shadow: 0 0 0 1px color-mix(in srgb, #d8442a 40%, transparent);
}

.regex-match.is-zero {
  padding-inline: 2px;
  color: #f4f1e8;
  background: #e0a92e;
  box-shadow: none;
}

.regex-empty {
  margin: 0;
  padding: 40px 24px;
  text-align: center;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  color: #6b665b;
}

.match-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.match-card {
  padding: 16px 24px;
  background: #ece7d9;
  border: 1px solid #d9d3c3;
  border-radius: 2px;
}

.match-card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 8px;
}

.match-pos {
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  color: #6b665b;
  font-variant-numeric: tabular-nums;
}

.match-full {
  margin: 0;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
  word-break: break-word;
  color: #1c1b18;
}

.match-groups {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid #d9d3c3;
}

.match-group-row {
  display: flex;
  gap: 16px;
  font-family: "Inter", "Noto Sans TC", sans-serif;
  font-size: 1rem;
}

.match-group-label {
  flex: 0 0 auto;
  min-width: 5em;
  color: #6b665b;
}

.match-group-value {
  word-break: break-word;
  color: #1c1b18;
}
.match-group-value.is-empty {
  color: #6b665b;
  font-style: italic;
}

@media (max-width: 640px) {
  .regex-delim {
    display: none;
  }
  .text-area {
    min-height: 160px;
  }
}