:root {
  --ink: #1d1f22;
  --muted: #5f6368;
  --paper: #eef0f2;
  --panel: #fbfbfa;
  --line: rgba(29, 31, 34, 0.15);
  --accent: #8b2e34;
  --charcoal: #25292d;
  --font-main: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-main);
  margin: 0;
}

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

button,
.panel-actions a {
  background: var(--ink);
  border: 1px solid var(--ink);
  color: white;
  font-family: var(--font-display);
  font-size: 1.05rem;
  padding: 0.7rem 1rem;
  text-decoration: none;
}

button.secondary {
  background: transparent;
  color: var(--ink);
}

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

.login-view {
  display: grid;
  min-height: 100vh;
  padding: 2rem;
  place-items: center;
}

.login-card {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(29, 31, 34, 0.12);
  max-width: 460px;
  padding: 2rem;
  width: 100%;
}

.login-card span,
.panel-header span {
  color: var(--accent);
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  margin-top: 0;
}

h1 {
  font-size: clamp(2.7rem, 6vw, 4.6rem);
  margin-bottom: 1.25rem;
}

h2 {
  font-size: 2rem;
}

.local-file-notice {
  background: rgba(139, 46, 52, 0.08);
  border: 1px solid rgba(139, 46, 52, 0.24);
  margin-bottom: 1.2rem;
  padding: 1rem;
}

.local-file-notice strong {
  display: block;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.local-file-notice p {
  color: var(--muted);
  line-height: 1.45;
  margin: 0 0 0.8rem;
}

.local-file-notice a {
  background: var(--ink);
  color: white;
  display: inline-flex;
  padding: 0.65rem 0.9rem;
  text-decoration: none;
}

label {
  display: grid;
  gap: 0.35rem;
}

input,
textarea,
select {
  background: white;
  border: 1px solid var(--line);
  color: var(--ink);
  min-height: 42px;
  padding: 0.65rem;
  width: 100%;
}

textarea {
  min-height: 110px;
  resize: vertical;
}

.panel-view {
  padding: 2rem 5vw 4rem;
}

.panel-header,
.section-row,
.panel-actions,
.panel-tabs {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
}

.panel-header {
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.2rem;
  padding-bottom: 1rem;
}

.public-admin-warning {
  background: rgba(139, 46, 52, 0.08);
  border: 1px solid rgba(139, 46, 52, 0.22);
  color: var(--ink);
  margin: 0 0 1rem;
  padding: 0.8rem 1rem;
}

.panel-actions {
  justify-content: flex-end;
}

.panel-tabs {
  justify-content: flex-start;
  margin-bottom: 1rem;
}

.panel-tabs button {
  background: transparent;
  color: var(--ink);
}

.panel-tabs button.is-active {
  background: var(--charcoal);
  color: white;
}

.manual-card {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 18px 48px rgba(29, 31, 34, 0.08);
  max-width: 760px;
  padding: 1.4rem;
}

.manual-card span {
  color: var(--accent);
  display: block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  text-transform: uppercase;
}

.manual-card p {
  color: var(--muted);
  line-height: 1.55;
  margin-bottom: 1rem;
}

.manual-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.manual-actions a {
  background: var(--ink);
  border: 1px solid var(--ink);
  color: white;
  display: inline-flex;
  font-family: var(--font-display);
  padding: 0.75rem 1rem;
  text-decoration: none;
}

.manual-actions a + a {
  background: transparent;
  color: var(--ink);
}

.message {
  color: var(--accent);
  min-height: 1.3em;
}

#panel-message {
  background: rgba(139, 46, 52, 0.06);
  border: 1px solid rgba(139, 46, 52, 0.16);
  color: var(--ink);
  margin: 0 0 1rem;
  padding: 0.75rem 0.9rem;
}

.panel-section {
  display: none;
}

.panel-section.is-active {
  display: block;
}

.form-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.wide {
  grid-column: 1 / -1;
}

.editor-list {
  display: grid;
  gap: 1rem;
}

.editor-card {
  background: var(--panel);
  border: 1px solid var(--line);
  display: grid;
  gap: 1rem;
  padding: 1rem;
}

.editor-card-header {
  align-items: center;
  display: flex;
  gap: 0.75rem;
  justify-content: space-between;
}

.editor-card h3 {
  font-size: 1.35rem;
  margin-bottom: 0;
}

.mini-grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.cover-editor {
  background: #eef0f2;
  border: 1px solid var(--line);
  display: grid;
  gap: 1rem;
  grid-column: 1 / -1;
  grid-template-columns: 140px 1fr;
  padding: 1rem;
}

.section-help {
  color: var(--muted);
  line-height: 1.45;
  margin: -0.8rem 0 0;
  max-width: 760px;
}

.cover-section-heading {
  align-items: stretch;
}

.book-primary-actions {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(190px, 1fr));
  min-width: min(100%, 460px);
}

.book-main-action,
.cover-batch-control {
  background: var(--ink);
  color: white;
  cursor: pointer;
  display: grid;
  gap: 0.25rem;
  min-height: 72px;
  padding: 0.85rem 1rem;
  text-align: left;
}

.cover-batch-control {
  border: 1px solid var(--ink);
}

.book-main-action {
  background: var(--accent);
  border-color: var(--accent);
}

.book-main-action strong,
.cover-batch-control strong {
  font-size: 1.05rem;
}

.book-main-action span,
.cover-batch-control span {
  color: inherit;
  font-size: 0.9rem;
  opacity: 0.82;
}

.cover-assignment-list {
  display: grid;
  gap: 0.8rem;
}

.new-book-form {
  background: var(--panel);
  border: 1px solid var(--line);
  display: grid;
  gap: 1rem;
  margin: 1rem 0;
  padding: 1rem;
}

.new-book-form[hidden] {
  display: none;
}

.new-book-form h3 {
  font-size: 1.3rem;
  margin: 0;
}

.cover-assignment-card {
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  display: grid;
  gap: 1rem;
  grid-template-columns: 82px minmax(0, 1fr) auto;
  padding: 0.8rem;
}

.cover-assignment-card .cover-preview {
  width: 82px;
}

.cover-assignment-copy {
  display: grid;
  gap: 0.4rem;
}

.cover-assignment-copy span,
.cover-assignment-copy small {
  color: var(--muted);
}

.cover-assignment-copy h3 {
  font-size: 1.1rem;
  margin: 0;
}

.cover-assignment-copy label {
  color: var(--muted);
  font-size: 0.9rem;
}

.cover-assignment-actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  justify-content: flex-end;
}

.cover-preview {
  aspect-ratio: 3 / 4;
  background: white;
  border: 1px solid var(--line);
  display: grid;
  overflow: hidden;
  place-items: center;
  width: 140px;
}

.cover-preview img {
  display: block;
  height: 100%;
  object-fit: cover;
  width: 100%;
}

.cover-preview.is-empty {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.75rem;
  text-align: center;
}

.cover-actions {
  align-content: start;
  display: grid;
  gap: 0.75rem;
}

.cover-actions strong {
  font-size: 1.05rem;
}

.cover-actions p {
  color: var(--muted);
  line-height: 1.45;
  margin: 0;
}

.nested-list {
  display: grid;
  gap: 0.75rem;
}

.nested-card {
  background: #eef0f2;
  border: 1px solid var(--line);
  display: grid;
  gap: 0.75rem;
  padding: 0.85rem;
}

.upload-control span {
  color: var(--muted);
}

@media (max-width: 820px) {
  .form-grid,
  .mini-grid {
    grid-template-columns: 1fr;
  }

  .cover-editor {
    grid-template-columns: 1fr;
  }

  .cover-assignment-card {
    align-items: start;
    grid-template-columns: 74px 1fr;
  }

  .book-primary-actions {
    grid-template-columns: 1fr;
    width: 100%;
  }

  .cover-assignment-actions {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }

  .panel-view {
    padding: 1rem;
  }
}