:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-hover: #2d3748;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-blue: #38bdf8;
  --accent-purple: #a855f7;
  --accent-green: #34d399;
  --accent-danger: #f87171;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background-color: rgba(30, 41, 59, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-icon {
  font-size: 2rem;
  background: linear-gradient(135deg, #0284c7, #6366f1);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.header-brand h1 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tagline {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  background-color: rgba(52, 211, 153, 0.12);
  color: var(--accent-green);
  border: 1px solid rgba(52, 211, 153, 0.25);
  border-radius: 9999px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.45);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: #475569;
}

.btn-success {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(16, 185, 129, 0.45);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
}

.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.3rem 0.5rem;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

/* Main */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1.5rem 2rem;
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
}

/* Drop Zone */
.drop-zone {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at center, rgba(30, 41, 59, 0.7) 0%, rgba(15, 23, 42, 0.9) 100%);
  padding: 4rem 2rem;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent-blue);
  background-color: rgba(56, 189, 248, 0.05);
  box-shadow: 0 0 32px rgba(56, 189, 248, 0.15);
}

.file-input-hidden {
  display: none;
}

.upload-icon {
  font-size: 4rem;
  margin-bottom: 1.25rem;
  filter: drop-shadow(0 4px 12px rgba(56, 189, 248, 0.3));
}

.drop-zone h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.drop-zone p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.drop-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 1.25rem;
}

/* Progress Container */
.progress-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  text-align: center;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 1.5rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.progress-container h3 {
  font-size: 1.25rem;
  margin-bottom: 0.4rem;
}

.progress-container p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.progress-bar-bg {
  width: 100%;
  max-width: 440px;
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: 9999px;
  overflow: hidden;
}

.progress-bar-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
  transition: width 0.3s ease;
}

/* Viewer Container */
.viewer-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1;
}

/* Info Bar */
.package-info-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 0.85rem 1.25rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.info-group {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
}

.info-label {
  color: var(--text-muted);
}

.info-value {
  font-weight: 600;
  color: var(--text-main);
}

.bar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Toolbar */
.viewer-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0.85rem;
  background-color: rgba(30, 41, 59, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.search-box {
  display: flex;
  align-items: center;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.75rem;
  width: 320px;
  transition: var(--transition);
}

.search-box:focus-within {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.search-icon {
  margin-right: 0.5rem;
  font-size: 0.9rem;
}

.search-box input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.85rem;
  width: 100%;
}

.btn-clear {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0 0.25rem;
  font-size: 0.8rem;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-right: 0.25rem;
}

.filter-btn {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  color: var(--text-main);
  background-color: var(--bg-tertiary);
}

.filter-btn.active {
  background: var(--accent-blue);
  color: #0f172a;
  border-color: var(--accent-blue);
  font-weight: 600;
}

/* Workspace */
.viewer-workspace {
  display: grid;
  grid-template-columns: 280px 1fr 340px;
  gap: 1rem;
  flex: 1;
  min-height: 580px;
}

/* Tree Sidebar */
.sidebar-tree {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(15, 23, 42, 0.4);
}

.sidebar-header h3 {
  font-size: 0.9rem;
  font-weight: 600;
}

.tree-content {
  flex: 1;
  padding: 0.5rem;
  overflow-y: auto;
  max-height: 650px;
  font-size: 0.82rem;
}

.tree-node {
  margin: 2px 0;
}

.tree-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
}

.tree-label:hover {
  background-color: var(--bg-hover);
}

.tree-label.active {
  background-color: rgba(56, 189, 248, 0.15);
  color: var(--accent-blue);
}

.tree-arrow {
  display: inline-block;
  width: 14px;
  text-align: center;
  font-size: 0.65rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.tree-arrow.expanded {
  transform: rotate(90deg);
}

.tree-children {
  padding-left: 1rem;
  display: none;
}

.tree-children.show {
  display: block;
}

/* Asset List */
.asset-list-section {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.list-header {
  display: grid;
  grid-template-columns: 1fr 100px 90px 90px;
  padding: 0.75rem 1rem;
  background-color: rgba(15, 23, 42, 0.4);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.asset-list {
  flex: 1;
  overflow-y: auto;
  max-height: 650px;
}

.asset-row {
  display: grid;
  grid-template-columns: 1fr 100px 90px 90px;
  align-items: center;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid rgba(51, 65, 85, 0.4);
  font-size: 0.84rem;
  cursor: pointer;
  transition: var(--transition);
}

.asset-row:hover {
  background-color: var(--bg-hover);
}

.asset-row.active {
  background-color: rgba(56, 189, 248, 0.1);
  border-left: 3px solid var(--accent-blue);
}

.col-name {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.asset-icon {
  font-size: 1.1rem;
}

.asset-path-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.col-type {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.col-size {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.col-action {
  display: flex;
  justify-content: flex-end;
}

.btn-download-single {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  background-color: var(--bg-tertiary);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-download-single:hover {
  background-color: var(--accent-blue);
  color: #0f172a;
}

.no-results {
  padding: 3rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Preview Panel */
.preview-panel {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(15, 23, 42, 0.4);
}

.preview-header h3 {
  font-size: 0.9rem;
  font-weight: 600;
}

.preview-body {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  max-height: 650px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}

.preview-placeholder {
  margin: auto;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
}

.preview-img-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.preview-img {
  max-width: 100%;
  max-height: 280px;
  object-fit: contain;
  background-color: rgba(0, 0, 0, 0.4);
  background-image: linear-gradient(45deg, #1e293b 25%, transparent 25%), 
                    linear-gradient(-45deg, #1e293b 25%, transparent 25%), 
                    linear-gradient(45deg, transparent 75%, #1e293b 75%), 
                    linear-gradient(-45deg, transparent 75%, #1e293b 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.preview-code {
  width: 100%;
  background-color: #0b1120;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: #e2e8f0;
  overflow-x: auto;
  max-height: 380px;
  white-space: pre;
}

.preview-meta {
  width: 100%;
  margin-top: 1rem;
  border-top: 1px solid var(--border-color);
  padding-top: 0.85rem;
  font-size: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.meta-row {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
}

.meta-key {
  color: var(--text-muted);
}

.meta-val {
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-align: right;
  word-break: break-all;
}

/* Footer */
.app-footer {
  padding: 1.25rem 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  background-color: var(--bg-primary);
}

.hidden {
  display: none !important;
}

/* レスポンシブ */
@media (max-width: 1100px) {
  .viewer-workspace {
    grid-template-columns: 240px 1fr;
  }
  .preview-panel {
    display: none;
  }
}

@media (max-width: 768px) {
  .viewer-workspace {
    grid-template-columns: 1fr;
  }
  .sidebar-tree {
    max-height: 250px;
  }
}