:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --border: #d8dee4;
  --text: #1f2933;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --success: #059669;
  --danger: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

.hidden {
  display: none !important;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand h1 {
  margin: 0;
  font-size: 1.35rem;
}

.badge {
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}

.badge.ok {
  background: #d1fae5;
  color: var(--success);
}

.badge.error {
  background: #fee2e2;
  color: var(--danger);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.filters input,
.filters select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
}

.filters input[type="search"] {
  min-width: 260px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  color: var(--muted);
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr 1.1fr;
  gap: 16px;
  padding: 16px;
  min-height: calc(100vh - 84px);
}

.piece-list-panel,
.detail-panel,
.preview-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.panel-header h2 {
  margin: 0;
  font-size: 1rem;
}

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

.piece-list {
  list-style: none;
  margin: 0;
  padding: 8px;
  overflow: auto;
}

.piece-list li button {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  border-radius: 10px;
  padding: 12px;
  cursor: pointer;
}

.piece-list li button:hover,
.piece-list li button.active {
  background: var(--accent-soft);
  border-color: #bfdbfe;
}

.piece-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.piece-sub {
  font-size: 0.85rem;
  color: var(--muted);
}

.empty-state {
  display: grid;
  place-items: center;
  flex: 1;
  color: var(--muted);
  padding: 24px;
}

.detail-view {
  padding: 16px;
  overflow: auto;
}

.detail-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.detail-header h2 {
  margin: 0 0 6px;
}

.path {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  background: #eef2ff;
  color: #4338ca;
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 0.8rem;
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.meta-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}

.meta-card h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
}

.meta-card dl {
  margin: 0;
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 8px 10px;
  font-size: 0.92rem;
}

.meta-card dt {
  color: var(--muted);
}

.meta-card dd {
  margin: 0;
}

.chip-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip-list li {
  background: #f3f4f6;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.85rem;
}

.sheets-section h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
}

.sheet-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sheet-list li button {
  width: 100%;
  text-align: left;
  border: 1px solid var(--border);
  background: white;
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
}

.sheet-list li button:hover,
.sheet-list li button.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.sheet-name {
  font-weight: 600;
}

.sheet-assignment {
  font-size: 0.85rem;
  color: var(--muted);
}

.preview-panel .panel-header {
  gap: 12px;
}

.link-button {
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
}

.preview-frame {
  flex: 1;
  min-height: 0;
  padding: 12px;
}

.preview-frame iframe,
.preview-frame img {
  width: 100%;
  height: calc(100vh - 180px);
  border: 1px solid var(--border);
  border-radius: 10px;
  background: white;
}

.preview-frame img {
  object-fit: contain;
}

.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #eef2ff 0%, var(--bg) 100%);
  padding: 24px;
}

.login-card {
  width: min(100%, 380px);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-card h1 {
  margin: 0;
}

.login-card label {
  font-size: 0.92rem;
  color: var(--muted);
}

.login-card input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.login-card button[type="submit"],
.secondary-button {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: white;
  cursor: pointer;
}

.login-card button[type="submit"] {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.login-error {
  color: var(--danger);
  margin: 0;
  font-size: 0.92rem;
}

.detail-actions,
.preview-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.detail-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

@media print {
  body.printing-piece .topbar,
  body.printing-piece .piece-list-panel,
  body.printing-piece .preview-panel,
  body.printing-piece .detail-actions,
  body.printing-piece .sheets-section,
  body.printing-piece .tag-row {
    display: none !important;
  }

  body.printing-piece .layout {
    display: block;
    padding: 0;
  }

  body.printing-piece .detail-panel,
  body.printing-piece .detail-view {
    border: none;
    box-shadow: none;
  }
}

@media (max-width: 1200px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .preview-frame iframe,
  .preview-frame img {
    height: 70vh;
  }
}