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

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --border: #30363d;
  --accent: #238636;
  --accent-hover: #2ea043;
  --string: #a5d6ff;
  --number: #79c0ff;
  --boolean: #ffa657;
  --null: #ff7b72;
  --key: #7ee787;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.2s, color 0.2s;
}

body.light-theme {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-tertiary: #eaeef2;
  --text-primary: #24292f;
  --text-secondary: #57606a;
  --border: #d0d7de;
  --string: #0969da;
  --number: #8250df;
  --boolean: #bc4c00;
  --null: #cf222e;
  --key: #116329;
}

/* container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
}

/* header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 15px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

header h1 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
}

.file-info {
  display: none;
  gap: 15px;
  font-size: 13px;
  color: var(--text-secondary);
  align-items: center;
}

.file-info span {
  padding: 4px 10px;
  background: var(--bg-secondary);
  border-radius: 4px;
}

.validation {
  font-weight: 600;
}

.validation.valid {
  color: var(--accent);
}

.validation.invalid {
  color: var(--null);
}

.controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  padding: 8px 16px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}

.btn:hover {
  background: var(--accent-hover);
}

.btn-icon {
  padding: 4px 8px;
  background: transparent;
  color: var(--text-secondary);
  border: none;
  cursor: pointer;
  font-size: 16px;
  border-radius: 4px;
  transition: background 0.2s;
}

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

/* drop zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 60px 20px;
  text-align: center;
  background: var(--bg-secondary);
  transition: all 0.2s;
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--bg-tertiary);
}

.drop-zone-content svg {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.drop-zone-content p {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 8px;
}

.drop-zone-content .hint {
  font-size: 13px;
  opacity: 0.7;
}

/* toolbar */
.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  gap: 15px;
  flex-wrap: wrap;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 250px;
}

.search-box input {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 14px;
}

.search-box input:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: var(--accent);
}

*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.stats {
  font-size: 13px;
  color: var(--text-secondary);
  padding: 8px 12px;
  background: var(--bg-secondary);
  border-radius: 6px;
}

/* tree view */
.tree-view {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 15px;
  font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 13px;
  overflow-x: auto;
}

.tree-node {
  margin-left: 20px;
}

.tree-node:first-child {
  margin-left: 0;
}

.tree-header {
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background 0.2s;
  position: relative;
}

.tree-header:hover {
  background: var(--bg-tertiary);
}

.tree-header:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.tree-header.highlight {
  background: rgba(255, 215, 0, 0.2);
}

.tree-leaf {
  cursor: default;
}

.toggle {
  color: var(--text-secondary);
  user-select: none;
  font-size: 10px;
  width: 12px;
}

.key {
  color: var(--key);
  font-weight: 600;
}

.type {
  color: var(--text-secondary);
  font-size: 11px;
  font-style: italic;
}

.value {
  font-weight: 500;
}

.value-string {
  color: var(--string);
}

.value-number {
  color: var(--number);
}

.value-boolean {
  color: var(--boolean);
}

.value-null {
  color: var(--null);
}

.copy-path {
  opacity: 0;
  padding: 2px 6px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  font-size: 11px;
  transition: opacity 0.2s, background 0.2s;
  margin-left: auto;
}

.tree-header:hover .copy-path {
  opacity: 1;
}

.copy-path:hover {
  background: var(--bg-primary);
}

.tree-children {
  margin-left: 20px;
  margin-top: 4px;
}

.tree-children.collapsed {
  display: none;
}

/* raw view */
.raw-view {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 15px;
  overflow-x: auto;
}

.raw-view pre {
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-primary);
}

.raw-view code {
  color: var(--text-primary);
}

/* toast */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--accent);
  color: white;
  padding: 12px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s, transform 0.3s;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast-error {
  background: var(--null);
}

/* responsive */
@media (max-width: 768px) {
  .container {
    padding: 15px;
  }
  
  header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .header-left {
    width: 100%;
  }
  
  .controls {
    width: 100%;
  }
  
  .btn {
    flex: 1;
  }
  
  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }
  
  .search-box {
    min-width: 100%;
  }
  
  .tree-node {
    margin-left: 15px;
  }
  
  .tree-children {
    margin-left: 15px;
  }
}

/* scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}