:root {
  color-scheme: light;
  --bg: #f6f7f4;
  --surface: #ffffff;
  --line: #d9ded6;
  --text: #18201b;
  --muted: #657067;
  --accent: #0f766e;
  --accent-dark: #0b5f59;
  --warn: #b45309;
  --danger: #b91c1c;
  --shadow: 0 10px 28px rgba(20, 34, 26, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select,
input {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
}

button {
  min-height: 38px;
  padding: 0 14px;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

button:disabled {
  cursor: wait;
  opacity: 0.65;
}

.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.primary:hover {
  background: var(--accent-dark);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
}

h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0;
}

#subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.top-actions select {
  width: 190px;
  height: 38px;
  padding: 0 10px;
}

.logout-btn {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: 0 12px;
  height: 38px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}
.logout-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(420px, 1fr) minmax(310px, 380px);
  gap: 14px;
  height: calc(100vh - 76px);
  padding: 14px;
}

.panel,
.writer {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  min-height: 0;
}

.panel {
  overflow: auto;
  padding: 16px;
}

.prompt-panel {
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.panel-header.compact {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
}

.eyebrow {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.meta span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  color: var(--muted);
  font-size: 12px;
}

.prompt-content {
  line-height: 1.55;
  white-space: pre-wrap;
}

.prompt-block {
  margin: 14px 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.prompt-block strong {
  display: block;
  margin-bottom: 6px;
}

.nav-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}

.nav-info {
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 5px 14px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}

.empty {
  color: var(--muted);
}

.writer {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.writer-toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 58px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
}

.timer {
  width: 96px;
  color: var(--accent-dark);
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.timer.expired {
  color: var(--danger);
}

.status {
  display: flex;
  flex: 1;
  gap: 14px;
  color: var(--muted);
  font-size: 13px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

#answerBox {
  flex: 1;
  width: 100%;
  min-height: 320px;
  resize: none;
  border: 0;
  outline: none;
  padding: 22px;
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.7;
}

.editor-area {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.highlight-layer {
  position: absolute;
  inset: 0;
  padding: 22px;
  overflow-y: scroll;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-wrap: break-word;
  color: var(--text);
  pointer-events: none;
  z-index: 0;
  contain: strict;
  will-change: contents;
}

.highlight-layer .hl-err {
  background: #fef08a;
  border-radius: 2px;
}

.editor-area #answerBox {
  position: absolute;
  inset: 0;
  flex: none;
  min-height: 0;
  z-index: 1;
  background: transparent;
}

.editor-area #answerBox:not(.lint-active) {
  color: var(--text);
}

.editor-area #answerBox.lint-active {
  color: transparent;
  caret-color: var(--text);
}

.editor-area #answerBox.lint-active::placeholder {
  color: var(--muted);
}

.side-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.settings-collapse {
  border: none;
}

.settings-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.settings-toggle::-webkit-details-marker {
  display: none;
}

.settings-toggle::marker {
  display: none;
  content: "";
}

.settings-chevron {
  font-size: 12px;
  color: var(--muted);
  transition: transform 0.2s;
}

details[open] .settings-chevron {
  transform: rotate(180deg);
}

.settings-body {
  padding-top: 12px;
}

.settings-actions {
  display: flex;
  gap: 8px;
}

.settings-actions button {
  flex: 1;
}

.settings-grid {
  display: grid;
  gap: 10px;
}

.settings-grid label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 12px;
}

.settings-grid input,
.settings-grid select {
  width: 100%;
  min-height: 36px;
  padding: 0 10px;
}

.connection-result {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  background: #fbfcfa;
}

.connection-result.ok {
  border-color: #86b89b;
  color: #166534;
  background: #f0fdf4;
}

.connection-result.bad {
  border-color: #f0a9a9;
  color: var(--danger);
  background: #fff5f5;
}

.evaluation-content {
  display: grid;
  gap: 10px;
  line-height: 1.5;
}

.score-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.score-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
}

.score-card b {
  display: block;
  margin-bottom: 6px;
}

.score-number {
  color: var(--accent-dark);
  font-size: 24px;
  font-weight: 700;
}

.evaluation-content ul {
  margin: 6px 0 0;
  padding-left: 20px;
}

.model-essay {
  max-height: 260px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  white-space: pre-wrap;
  background: #fbfcfa;
}

.history-list {
  display: grid;
  gap: 6px;
}

.history-group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 36px;
  padding: 6px 9px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
}

.history-group-header:hover {
  border-color: var(--accent);
}

.history-group-header strong {
  flex: 1;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-group-header span {
  color: var(--muted);
  font-size: 11px;
  white-space: nowrap;
}

.group-chevron {
  display: inline-block;
  font-size: 10px;
  transition: transform 0.15s;
  width: 14px;
  text-align: center;
}

.group-chevron.open {
  transform: rotate(90deg);
}

.group-best-badge {
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 1px 7px;
  color: var(--accent);
  font-weight: 700;
  font-size: 11px;
}

.history-item {
  display: grid;
  gap: 4px;
  width: 100%;
  min-height: 82px;
  padding: 9px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfa;
  cursor: pointer;
}

.history-item:hover {
  border-color: var(--accent);
}

.history-item.active {
  border-color: var(--accent);
  background: #f0faf9;
}

.history-item-nested {
  margin-left: 16px;
  min-height: 72px;
}

.history-item span {
  color: var(--muted);
  font-size: 12px;
}

.history-item-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.history-item-row strong {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-score-badge {
  flex-shrink: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 1px 8px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.history-score-badge.score-high {
  border-color: #86b89b;
  color: #166534;
  background: #f0fdf4;
}

.history-score-badge.score-mid {
  border-color: #d4a843;
  color: #92400e;
  background: #fffbeb;
}

.history-score-badge.score-low {
  border-color: #f0a9a9;
  color: var(--danger);
  background: #fff5f5;
}

.history-score-badge.status-badge {
  color: var(--muted);
  font-weight: 400;
}

.history-actions {
  display: flex;
  gap: 5px;
  margin-top: 4px;
}

.history-open-btn,
.history-redo-btn,
.history-del-btn {
  flex: 1;
  min-height: 28px;
  font-size: 12px;
  padding: 0 6px;
}

.history-redo-btn {
  border-color: var(--accent);
  color: var(--accent);
}

.history-redo-btn:hover {
  background: var(--accent);
  color: #fff;
}

.history-del-btn {
  color: var(--danger);
}

.history-del-btn:hover {
  background: var(--danger);
  color: #fff;
}

dialog {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  box-shadow: var(--shadow);
}

dialog::backdrop {
  background: rgba(24, 32, 27, 0.28);
}

dialog h2 {
  margin: 0 0 8px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 22px;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
  color: var(--muted);
  font-size: 12px;
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.footer-sep {
  opacity: 0.4;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 18px;
}

@media (max-width: 1120px) {
  .layout {
    grid-template-columns: 1fr;
    height: auto;
  }

  .panel,
  .writer {
    min-height: 360px;
  }

  .topbar,
  .top-actions,
  .writer-toolbar {
    flex-wrap: wrap;
  }
}

@media (max-width: 640px) {
  .topbar {
    align-items: stretch;
  }

  .top-actions,
  .top-actions select,
  .top-actions button {
    width: 100%;
  }

  .status {
    width: 100%;
    flex: auto;
  }

  #answerBox {
    font-size: 16px;
    padding: 16px;
  }

  .highlight-layer {
    font-size: 16px;
    padding: 16px;
  }
}