:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #667085;
  --line: #d9e2ef;
  --primary: #1f6feb;
  --primary-dark: #1858c7;
  --success: #11825d;
  --warning: #b86e00;
  --danger: #c0352b;
  --shadow: 0 12px 30px rgba(23, 32, 51, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family:
    "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    Arial, sans-serif;
  letter-spacing: 0;
}

button,
textarea,
input {
  font: inherit;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px clamp(16px, 4vw, 40px);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

h1 {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.2;
}

.status {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.status.ok {
  color: var(--success);
}

.status.err {
  color: var(--danger);
}

.workspace {
  width: min(1120px, calc(100vw - 32px));
  margin: 24px auto 48px;
}

.tabs {
  display: inline-flex;
  gap: 2px;
  padding: 4px;
  margin-bottom: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.tab {
  min-height: 38px;
  padding: 0 18px;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

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

.panel {
  display: none;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.panel.active {
  display: block;
}

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

label {
  font-weight: 700;
  font-size: 16px;
}

.field-head span {
  color: var(--muted);
  font-size: 13px;
}

textarea {
  width: 100%;
  resize: vertical;
  min-height: 132px;
  max-height: 42vh;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: #fbfdff;
  outline: none;
}

textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(31, 111, 235, 0.14);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

button,
.download-link {
  min-height: 38px;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

button:hover,
.download-link:hover {
  border-color: #b8c5d9;
}

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

button.primary,
.download-link.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

button.primary:hover,
.download-link.primary:hover {
  background: var(--primary-dark);
}

.icon-btn {
  white-space: nowrap;
}

.summary {
  margin-top: 18px;
  padding: 12px 14px;
  border: 1px solid #c8ddff;
  border-radius: 8px;
  background: #f0f6ff;
  color: #174ea6;
  font-size: 14px;
}

.results {
  margin-top: 18px;
  display: grid;
  gap: 14px;
}

.result-group {
  display: grid;
  gap: 10px;
}

.group-title {
  margin: 8px 0 0;
  font-size: 15px;
}

.resource {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.resource-url {
  overflow-wrap: anywhere;
  color: #344054;
  font-size: 13px;
  line-height: 1.55;
}

.resource-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}

.image-item {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.image-item img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: #e8eef8;
}

.image-item .resource-actions {
  justify-content: stretch;
  padding: 10px;
}

.image-item .resource-actions > * {
  flex: 1 1 0;
}

.empty,
.error {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: #fbfdff;
}

.error {
  border-color: #f3c2bf;
  color: var(--danger);
  background: #fff5f5;
}

.book-card {
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.book-title {
  margin: 0;
  font-size: 18px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  max-width: min(520px, calc(100vw - 32px));
  padding: 12px 16px;
  border-radius: 8px;
  background: #172033;
  color: #fff;
  box-shadow: var(--shadow);
  font-size: 14px;
}

@media (max-width: 720px) {
  .topbar {
    align-items: flex-start;
  }

  .workspace {
    width: calc(100vw - 20px);
    margin-top: 12px;
  }

  .panel {
    padding: 16px;
  }

  .field-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }

  .resource {
    grid-template-columns: 1fr;
  }

  .resource-actions {
    justify-content: stretch;
  }

  .resource-actions > * {
    flex: 1 1 auto;
  }
}