:root {
  color-scheme: light;
  --bg: #f5f8fc;
  --panel: #ffffff;
  --line: rgba(15, 23, 42, 0.08);
  --text: #13233a;
  --muted: #5a6a80;
  --brand: #0f6cbd;
  --brand-hover: #0a5a9f;
  --danger: #d14343;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(15, 108, 189, 0.08), transparent 28%),
    var(--bg);
}

button,
input,
textarea {
  font: inherit;
}

.hidden {
  display: none !important;
}

.panel,
.sidebar,
.editor-shell,
.helper-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

.login-panel {
  width: min(520px, calc(100vw - 32px));
  margin: 8vh auto 0;
  padding: 28px;
}

.login-panel h1,
.login-panel p {
  margin-top: 0;
}

#login-form {
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 8px;
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fbfdff;
  padding: 12px 14px;
}

textarea {
  min-height: 68vh;
  resize: vertical;
  font-family: "Consolas", "SFMono-Regular", monospace;
  line-height: 1.6;
}

button {
  border: none;
  border-radius: 14px;
  padding: 11px 16px;
  background: linear-gradient(135deg, var(--brand), #3f97ee);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: linear-gradient(135deg, var(--brand-hover), #2d88e0);
}

button.ghost {
  background: #fff;
  color: var(--brand);
  border: 1px solid rgba(15, 108, 189, 0.16);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.workspace {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 18px;
  min-height: 100vh;
  padding: 18px;
}

.sidebar {
  display: flex;
  flex-direction: column;
  padding: 18px;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.sidebar-header p {
  margin: 6px 0 0;
  color: var(--muted);
}

.search-input {
  margin-bottom: 14px;
}

.page-list {
  display: grid;
  gap: 10px;
  overflow: auto;
}

.page-item {
  padding: 12px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fbfdff;
  cursor: pointer;
}

.page-item.active {
  border-color: rgba(15, 108, 189, 0.28);
  background: rgba(15, 108, 189, 0.06);
}

.page-item strong {
  display: block;
}

.page-item span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
  word-break: break-all;
}

.editor-shell {
  display: flex;
  flex-direction: column;
  padding: 18px;
}

.editor-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.editor-toolbar p {
  margin: 6px 0 0;
  color: var(--muted);
}

.toolbar-actions {
  display: flex;
  gap: 10px;
}

.editor-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
}

.editor-panel,
.helper-panel {
  min-width: 0;
}

.helper-panel {
  display: grid;
  gap: 14px;
}

.helper-card {
  padding: 16px;
}

.helper-card strong {
  display: block;
  margin-bottom: 12px;
}

.helper-card button + button {
  margin-top: 8px;
}

.stacked {
  font-weight: 700;
}

.muted,
.error {
  margin: 10px 0 0;
  line-height: 1.6;
}

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

.error {
  color: var(--danger);
}

pre {
  margin: 0;
  padding: 12px;
  overflow: auto;
  border-radius: 14px;
  background: #f4f7fb;
  color: var(--text);
  white-space: pre-wrap;
}

@media (max-width: 1080px) {
  .workspace,
  .editor-grid {
    grid-template-columns: 1fr;
  }

  textarea {
    min-height: 50vh;
  }
}