.gd {
  --gd-bg: var(--surface);
  --gd-surface: var(--bg);
  --gd-line: var(--line);
  --gd-text: var(--text);
  --gd-muted: var(--text-2);
  --gd-accent: var(--accent);
  --gd-on-accent: var(--on-accent);
  --gd-good: #2E9E6A;
  --gd-bad: #D0453A;
  --gd-code-bg: var(--bg);
  --gd-mono: "Cascadia Code", "Cascadia Mono", "JetBrains Mono", Consolas, ui-monospace, monospace;
  --gd-radius: 14px;
  --gd-border: 1px;
  --gd-shadow: none;
  --gd-p0: #4F7BE0;
  --gd-p1: #D19A12;
  --gd-p2: #2E9E6A;
  --gd-p3: #C25BB0;
  max-width: 880px;
  margin: 0 auto;
  padding: 26px 28px 22px;
  border: var(--gd-border) solid var(--gd-line);
  border-radius: calc(var(--gd-radius) + 6px);
  background: var(--gd-bg);
  box-shadow: var(--gd-shadow);
  color: var(--gd-text);
}

.gd-top {
  display: flex;
  align-items: center;
  gap: 14px;
}

.gd-bar {
  display: flex;
  flex: 1;
  gap: 5px;
}

.gd-bar i {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--gd-line);
  transition: background-color 0.25s ease;
}

.gd-bar i.done {
  background: var(--gd-accent);
}

.gd-bar i.now {
  background: color-mix(in srgb, var(--gd-accent) 45%, var(--gd-line));
}

.gd-count {
  color: var(--gd-muted);
  font-family: var(--gd-mono);
  font-size: 13px;
  font-weight: 700;
}

.gd-kind {
  margin: 20px 0 6px;
  color: var(--gd-accent);
  font-family: var(--gd-mono);
  font-size: 13px;
  font-weight: 700;
  white-space: pre-wrap;
}

.gd-title {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 25px);
}

.gd-body {
  margin-top: 14px;
}

.gd-body p {
  margin: 0 0 12px;
  color: var(--gd-muted);
}

.gd-body p b,
.gd-body p strong,
.gd-body p code {
  color: var(--gd-text);
}

.gd-body p code,
.gd-body li code {
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--gd-code-bg);
  font-family: var(--gd-mono);
  font-size: 0.9em;
}

.gd-body pre:not(.gd-code) {
  margin: 0 0 12px;
  padding: 12px 16px;
  overflow-x: auto;
  border-radius: var(--gd-radius);
  background: var(--gd-code-bg);
  font-family: var(--gd-mono);
  font-size: 14px;
}

.gd .gd-prompt {
  color: var(--gd-text);
  font-weight: 600;
}

.gd .gd-code {
  margin: 0 0 14px;
  padding: 14px 18px;
  overflow-x: auto;
  border: 1px solid var(--gd-line);
  border-radius: var(--gd-radius);
  background: var(--gd-code-bg);
  color: var(--gd-text);
  font-family: var(--gd-mono);
  font-size: 14.5px;
  font-variant-ligatures: none;
  line-height: 1.7;
  white-space: pre;
}

.gd-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.gd-opt,
.gd-card,
.gd-line,
.gd-frag,
.gd-pair,
.gd-chip,
.gd-slot {
  border: var(--gd-border) solid var(--gd-line);
  background: var(--gd-surface);
  color: var(--gd-text);
  font: inherit;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.12s ease;
}

.gd-opt {
  padding: 12px 16px;
  border-radius: var(--gd-radius);
  font-family: var(--gd-mono);
  font-size: 15px;
  font-weight: 700;
  text-align: left;
}

.gd-opt:hover,
.gd-card:hover,
.gd-line:hover,
.gd-frag:hover:not(:disabled),
.gd-pair:hover,
.gd-chip:hover:not(:disabled) {
  border-color: var(--gd-accent);
}

.gd-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.gd-card {
  padding: 12px;
  border-radius: var(--gd-radius);
  text-align: left;
}

.gd-card .gd-code {
  margin: 8px 0 0;
  font-size: 13px;
}

.gd-card-label {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--gd-line);
  font-family: var(--gd-mono);
  font-size: 13px;
  font-weight: 700;
}

.gd-lines {
  overflow-x: auto;
  padding: 8px 0;
  border: 1px solid var(--gd-line);
  border-radius: var(--gd-radius);
  background: var(--gd-code-bg);
}

.gd-line {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  width: 100%;
  padding: 2px 14px 2px 0;
  border: 0;
  border-left: 3px solid transparent;
  border-radius: 0;
  background: none;
  text-align: left;
}

.gd-line code,
.gd-frag code {
  font-family: var(--gd-mono);
  font-size: 14px;
  font-variant-ligatures: none;
  line-height: 1.7;
  white-space: pre;
}

.gd-ln {
  padding-right: 10px;
  color: var(--gd-muted);
  font-family: var(--gd-mono);
  font-size: 13px;
  line-height: 1.85;
  text-align: right;
  opacity: 0.6;
}

.gd-line.is-picked {
  border-left-color: var(--gd-accent);
  background: color-mix(in srgb, var(--gd-accent) 14%, transparent);
}

.gd-blank,
.gd-cell {
  padding: 2px 8px;
  border: 2px solid var(--gd-accent);
  border-radius: 6px;
  background: var(--gd-surface);
  color: var(--gd-text);
  font-family: var(--gd-mono);
  font-size: 14px;
  outline: none;
}

.gd-blank {
  margin: 0 2px;
  vertical-align: baseline;
}

.gd-cell {
  width: 100%;
  min-width: 56px;
  text-align: center;
}

.gd-hint {
  font-size: 14px;
  font-style: italic;
}

.gd-slot {
  display: inline-block;
  min-width: 64px;
  margin: 0 2px;
  padding: 0 8px;
  border-style: dashed;
  border-radius: 6px;
  font-family: var(--gd-mono);
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
}

.gd-slot.is-filled {
  border-style: solid;
  border-color: var(--gd-accent);
}

.gd-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.gd-chip {
  padding: 7px 14px;
  border-radius: 999px;
  font-family: var(--gd-mono);
  font-size: 14px;
  font-weight: 700;
}

.gd-chip:disabled,
.gd-frag:disabled {
  opacity: 0.35;
  cursor: default;
}

.gd-order {
  display: grid;
  gap: 6px;
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  counter-reset: gdline;
}

.gd-placed {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: center;
  counter-increment: gdline;
}

.gd-placed::before {
  content: counter(gdline);
  color: var(--gd-muted);
  font-family: var(--gd-mono);
  font-size: 13px;
  opacity: 0.6;
}

.gd-placed.is-empty span {
  display: block;
  height: 36px;
  border: 1px dashed var(--gd-line);
  border-radius: 8px;
}

.gd-pool {
  display: grid;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px dashed var(--gd-line);
}

.gd-frag {
  width: 100%;
  padding: 5px 12px;
  border-radius: 8px;
  text-align: left;
}

.gd-trace {
  width: 100%;
  border-collapse: collapse;
}

.gd-trace th,
.gd-trace td {
  padding: 8px 10px;
  border: 1px solid var(--gd-line);
  text-align: left;
}

.gd-trace thead th {
  background: var(--gd-code-bg);
  font-size: 14px;
}

.gd-trace tbody th {
  color: var(--gd-muted);
  font-size: 14px;
  font-weight: 600;
}

.gd-match {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.gd-col {
  display: grid;
  gap: 8px;
}

.gd-pair {
  padding: 10px 14px;
  border-radius: var(--gd-radius);
  font-size: 15px;
  font-weight: 600;
  text-align: left;
}

.gd-mono {
  font-family: var(--gd-mono);
}

.gd-pair.is-active {
  border-color: var(--gd-accent);
  box-shadow: inset 0 0 0 1px var(--gd-accent);
}

.gd-p0 { border-color: var(--gd-p0); background: color-mix(in srgb, var(--gd-p0) 16%, var(--gd-surface)); }
.gd-p1 { border-color: var(--gd-p1); background: color-mix(in srgb, var(--gd-p1) 16%, var(--gd-surface)); }
.gd-p2 { border-color: var(--gd-p2); background: color-mix(in srgb, var(--gd-p2) 16%, var(--gd-surface)); }
.gd-p3 { border-color: var(--gd-p3); background: color-mix(in srgb, var(--gd-p3) 16%, var(--gd-surface)); }

.gd .is-picked {
  border-color: var(--gd-accent);
  background: color-mix(in srgb, var(--gd-accent) 16%, var(--gd-surface));
}

.gd .is-right {
  border-color: var(--gd-good);
  background: color-mix(in srgb, var(--gd-good) 20%, var(--gd-surface));
}

.gd .is-wrong {
  border-color: var(--gd-bad);
  background: color-mix(in srgb, var(--gd-bad) 18%, var(--gd-surface));
}

.gd-line.is-right {
  border-left-color: var(--gd-good);
}

.gd-line.is-wrong {
  border-left-color: var(--gd-bad);
}

.gd-feedback {
  min-height: 0;
  margin-top: 14px;
  font-size: 15.5px;
}

.gd-feedback:empty {
  display: none;
}

.gd-feedback.is-right,
.gd-feedback.is-wrong {
  padding: 12px 16px;
  border-radius: var(--gd-radius);
}

.gd-feedback.is-right strong {
  color: var(--gd-good);
}

.gd-feedback.is-wrong strong {
  color: var(--gd-bad);
}

.gd-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--gd-line);
}

.gd-status {
  color: var(--gd-muted);
  font-family: var(--gd-mono);
  font-size: 13px;
}

.gd-main {
  min-width: 140px;
  padding: 12px 22px;
  border: 0;
  border-radius: var(--gd-radius);
  background: var(--gd-accent);
  color: var(--gd-on-accent);
  font-family: var(--gd-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: transform 0.12s ease, opacity 0.15s ease;
}

.gd-main:disabled {
  opacity: 0.4;
  cursor: default;
}

.gd-main:not(:disabled):active {
  transform: scale(0.97);
}

.gd button:focus-visible,
.gd input:focus-visible {
  outline: 2px solid var(--gd-accent);
  outline-offset: 2px;
}

.gd-score strong {
  display: block;
  color: var(--gd-accent);
  font-size: 46px;
  line-height: 1.1;
}

.gd-end {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

@media (max-width: 640px) {
  .gd {
    padding: 20px 14px 16px;
  }

  .gd-options,
  .gd-cards {
    grid-template-columns: 1fr;
  }

  .gd-match {
    gap: 8px;
  }

  .gd-pair {
    padding: 9px 10px;
    font-size: 14px;
  }

  .gd .gd-code,
  .gd-line code,
  .gd-frag code {
    font-size: 12.5px;
  }

  .gd-main {
    min-width: 0;
    padding: 12px 16px;
  }
}