:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-2: #eef3f9;
  --border: #d4deea;
  --text: #18212f;
  --muted: #5d6b82;
  --primary: #1f6feb;
  --primary-strong: #1457bd;
  --success: #1d8f5a;
  --danger: #c44536;
  --warning: #c67a00;
  --shadow: 0 10px 30px rgba(24, 33, 47, 0.08);
  --radius: 8px;
  --gap: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "PingFang SC", "Microsoft YaHei", Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

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

button {
  cursor: pointer;
}

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

img {
  display: block;
  max-width: 100%;
}

.hidden {
  display: none !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;
}

.app-shell {
  min-height: 100vh;
}

.page-stack {
  display: grid;
  gap: 20px;
  padding: 20px;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  align-items: start;
  gap: var(--gap);
  padding: 20px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.topbar h1,
.section-heading h2,
.panel-header h3,
.status-block h4,
.detail-head h4,
.detail-section h5 {
  margin: 0;
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 700;
}

.topbar-side {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.auth-strip {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) auto;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.auth-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  min-width: 0;
}

.compact-field {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.compact-field span {
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
}

.compact-field input {
  padding: 8px 10px;
}

.topbar-actions,
.toolbar,
.bulk-actions,
.auth-actions,
.inline-actions,
.form-actions,
.detail-actions,
.backup-actions,
.meta-row,
.chip-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.auth-actions {
  justify-content: flex-end;
  align-content: start;
}

.auth-shell,
.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.auth-shell {
  padding: 18px;
  display: grid;
  gap: 16px;
}

.auth-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.auth-card {
  padding: 16px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr);
  gap: 20px;
  padding: 20px;
}

.composer,
.workspace,
.list-panel,
.detail-panel {
  min-width: 0;
}

.composer,
.workspace,
.list-panel,
.detail-panel,
.detail-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.composer,
.workspace {
  padding: 18px;
}

.stack {
  display: grid;
  gap: 14px;
}

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

.field {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.field span {
  font-size: 14px;
  font-weight: 600;
}

input,
select,
textarea {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 8px;
  padding: 10px 12px;
}

textarea {
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus,
.button:focus,
.icon-button:focus,
.question-main:focus {
  outline: 2px solid rgba(31, 111, 235, 0.2);
  outline-offset: 1px;
  border-color: var(--primary);
}

.button,
.icon-button,
.status-chip,
.badge,
.chip {
  border-radius: 8px;
}

.button {
  border: 1px solid transparent;
  padding: 10px 14px;
  font-weight: 600;
}

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

.button-primary:hover {
  background: var(--primary-strong);
}

.button-secondary {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}

.icon-button {
  width: 40px;
  height: 40px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
}

.icon-button.danger {
  color: var(--danger);
}

.status-chip,
.badge,
.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 6px 10px;
  font-size: 13px;
}

.status-chip {
  background: #e8f2ff;
  color: var(--primary-strong);
  font-weight: 700;
}

.status-chip.neutral {
  background: var(--surface-2);
  color: var(--muted);
}

.badge {
  background: #eef7ee;
  color: var(--success);
  font-weight: 700;
}

.chip {
  background: var(--surface-2);
  color: var(--muted);
}

.subtle-text {
  color: var(--muted);
  font-size: 13px;
}

.image-preview-wrap {
  display: grid;
  gap: 10px;
}

.image-preview {
  min-height: 180px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  display: grid;
  place-items: center;
  overflow: hidden;
}

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

.image-preview img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.workspace {
  display: grid;
  gap: 16px;
}

.workspace-top {
  display: grid;
  gap: 14px;
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(4, minmax(120px, 1fr));
}

.backup-panel {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  display: grid;
  gap: 14px;
}

.checkbox-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--muted);
}

.checkbox-row label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.backup-list {
  display: grid;
  gap: 8px;
}

.backup-item {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

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

.status-block {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.status-block h4 {
  font-size: 14px;
}

.search-field {
  display: block;
}

.feedback {
  min-height: 24px;
  color: var(--muted);
}

.feedback.success {
  color: var(--success);
}

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

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.9fr);
  gap: 16px;
}

.list-panel,
.detail-panel {
  padding: 14px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.question-list {
  display: grid;
  gap: 12px;
  max-height: calc(100vh - 420px);
  overflow: auto;
  padding-right: 4px;
}

.question-card {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 10px;
  padding: 10px;
  background: var(--surface-2);
  border: 1px solid transparent;
  border-radius: 8px;
}

.question-card.active {
  border-color: var(--primary);
  background: #f3f8ff;
}

.select-box {
  display: grid;
  place-items: start center;
  padding-top: 8px;
}

.question-main {
  border: 0;
  background: transparent;
  padding: 0;
  text-align: left;
  display: grid;
  gap: 10px;
}

.question-main-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.question-subject {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.question-title {
  margin: 0;
  font-size: 17px;
}

.question-summary,
.detail-copy,
.detail-empty {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.question-meta {
  color: var(--muted);
  font-size: 13px;
}

.detail-panel {
  align-self: start;
  position: sticky;
  top: 20px;
}

.detail-card {
  padding: 14px;
}

.detail-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.detail-section {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.detail-image-wrap {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface-2);
}

.detail-image-wrap img {
  width: 100%;
  max-height: 360px;
  object-fit: contain;
}

@media (max-width: 1120px) {
  .topbar,
  .auth-grid,
  .backup-grid,
  .backup-status-grid {
    grid-template-columns: 1fr;
  }

  .auth-actions {
    justify-content: flex-start;
  }

  .layout,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .detail-panel {
    position: static;
  }

  .question-list {
    max-height: none;
  }
}

@media (max-width: 760px) {
  .topbar,
  .layout {
    padding: 16px;
  }

  .layout {
    gap: 16px;
  }

  .field-grid,
  .toolbar,
  .auth-fields {
    grid-template-columns: 1fr;
  }

  .bulk-actions,
  .form-actions,
  .backup-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .question-card {
    grid-template-columns: 32px minmax(0, 1fr);
  }
}

@media (max-width: 560px) {
  .bulk-actions,
  .form-actions,
  .backup-actions,
  .auth-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .checkbox-row {
    flex-direction: column;
    align-items: flex-start;
  }
}