/* 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;
  --danger: #da3633;
}

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;
}

/* container */
.container {
  max-width: 100%;
  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);
}

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

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

.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:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-small {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-reset {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-reset:hover {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.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: none;
  border-color: var(--accent);
}

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

/* table */
.table-wrapper {
  overflow-x: auto;
  background: var(--bg-secondary);
  border-radius: 6px;
  border: 1px solid var(--border);
  margin-bottom: 15px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  background: var(--bg-tertiary);
  padding: 12px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

th:hover {
  background: var(--border);
}

.th-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.sort-indicator {
  color: var(--text-secondary);
  font-size: 12px;
}

th.sorted .sort-indicator {
  color: var(--accent);
}

.stats-btn {
  padding: 2px 6px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  opacity: 0;
  transition: opacity 0.2s, background 0.2s;
}

th:hover .stats-btn {
  opacity: 1;
}

.stats-btn:hover {
  background: var(--bg-secondary);
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  max-width: 400px;
  overflow: hidden;
  text-overflow: ellipsis;
}

tr:hover {
  background: var(--bg-tertiary);
}

/* pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 15px;
}

#pageInfo {
  font-size: 14px;
  color: var(--text-secondary);
}

#rowsPerPage {
  padding: 6px 10px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

/* modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: 20px;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
}

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

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
  word-break: break-word;
}

.stat-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.stat {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  font-size: 14px;
}

.stat label {
  color: var(--text-secondary);
  font-weight: 500;
}

.stat span {
  color: var(--text-primary);
  font-weight: 600;
}

.modal-content h4 {
  font-size: 14px;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* 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%;
  }
  
  th, td {
    padding: 8px;
    font-size: 12px;
  }
}

/* loading overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  gap: 16px;
  color: var(--text-primary);
  font-size: 16px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* scrollbar */
::-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);
}