:root {
  --bg-page: #f5f4ef;
  --bg-card: #ffffff;
  --bg-subtle: #f0efe9;
  --bg-success: #ecfdf3;
  --bg-error: #fef2f2;
  --text-primary: #18181b;
  --text-secondary: #3f3f46;
  --text-muted: #52525b;
  --border-default: #d4d4d8;
  --border-strong: #a1a1aa;
  --accent-green: #15803d;
  --accent-green-hover: #166534;
  --accent-blue: #1d4ed8;
  --accent-blue-hover: #1e40af;
  --danger: #b91c1c;
  --danger-bg: #fee2e2;
  --focus-ring: #1d4ed8;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --shadow-card: 0 2px 8px rgba(24, 24, 27, 0.06);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 1.125rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.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;
}

.shell {
  width: 100%;
  max-width: 38rem;
  margin: 0 auto;
  padding: 0 1rem;
}

.site-header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-default);
  padding: 1.125rem 0 1rem;
  text-align: center;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 1.625rem;
  line-height: 1.25;
}

.lead {
  margin: 0;
  font-size: 1.0625rem;
  color: var(--text-secondary);
}

.main-stack {
  padding-top: 1rem;
  padding-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card {
  background-color: var(--bg-card);
  border: 2px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: var(--shadow-card);
}

.notice-card {
  margin-top: 2rem;
  text-align: center;
}

.drop-zone {
  padding: 1.5rem 1rem;
  border-style: dashed;
  border-color: var(--border-strong);
}

.drop-zone.is-dragging {
  border-color: var(--accent-green);
  background-color: var(--bg-success);
}

.stage-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.875rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-default);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-counter {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.page-counter strong {
  color: var(--accent-green);
  font-size: 1.4rem;
}

.step-title {
  margin: 0 0 0.25rem;
  font-size: 1.375rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  min-height: 3.125rem;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  font-family: inherit;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  touch-action: manipulation;
  white-space: nowrap;
}

.btn:focus-visible,
.text-input:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-compact {
  min-height: 2.75rem;
  padding: 0.5rem 0.875rem;
  font-size: 1rem;
}

.btn-giant {
  width: 100%;
  min-height: 3.875rem;
  font-size: 1.25rem;
}

.btn-primary {
  background-color: var(--accent-green);
  color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-green-hover);
}

.btn-blue {
  background-color: var(--accent-blue);
  color: #ffffff;
}

.btn-blue:hover:not(:disabled) {
  background-color: var(--accent-blue-hover);
}

.btn-secondary {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-secondary:hover:not(:disabled) {
  background-color: #e4e4e7;
}

.btn-outline-danger {
  background-color: #ffffff;
  color: var(--danger);
  border-color: var(--danger);
}

.btn-outline-danger.is-confirming {
  background-color: var(--danger);
  color: #ffffff;
}

.btn-danger-soft {
  background-color: var(--bg-error);
  color: var(--danger);
  border-color: #fca5a5;
}

.page-list {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.page-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background-color: #fafafa;
}

.row-thumb-wrap {
  width: 4.25rem;
  height: 5.25rem;
  flex-shrink: 0;
  background-color: #ffffff;
  border: 1px solid var(--border-default);
  border-radius: 0.375rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.row-thumb {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.row-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.row-label {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.row-actions {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.375rem;
}

.row-btn {
  min-height: 2.625rem;
  padding: 0.375rem 0.25rem;
  font-size: 0.95rem;
  border-radius: 0.5rem;
}

.field-group {
  margin-bottom: 1rem;
}

.field-label {
  display: block;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.375rem;
  color: var(--text-secondary);
}

.text-input {
  width: 100%;
  min-height: 3.25rem;
  padding: 0.625rem 0.875rem;
  font-family: inherit;
  font-size: 1.125rem;
  color: var(--text-primary);
  background-color: #ffffff;
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-md);
}

.status-card {
  background-color: #f8fafc;
  border-color: var(--accent-blue);
}

.status-text {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  font-weight: 700;
}

.progress-bar {
  width: 100%;
  height: 1rem;
  accent-color: var(--accent-green);
}

.error-banner {
  background-color: var(--bg-error);
  border: 2px solid var(--danger);
  color: var(--danger);
  border-radius: var(--radius-md);
  padding: 0.875rem 1rem;
  font-size: 1.0625rem;
  font-weight: 700;
}

.result-card {
  background-color: var(--bg-success);
  border-color: var(--accent-green);
}

.success-title {
  color: var(--accent-green-hover);
}

.result-meta {
  margin: 0 0 1rem;
  font-size: 1.0625rem;
  color: var(--text-secondary);
}

.result-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.copy-feedback {
  margin: 0.75rem 0 0;
  text-align: center;
  color: var(--accent-green-hover);
  font-weight: 700;
}

.site-footer {
  padding: 0.75rem 0 2rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  text-align: center;
}