:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --surface-2: #243044;
  --border: #2d3a4f;
  --text: #e8edf4;
  --text-muted: #8b9cb3;
  --accent: #3b9eff;
  --accent-hover: #5cb0ff;
  --success: #34d399;
  --error: #f87171;
  --warning: #fbbf24;
  --radius: 12px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 158, 255, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(52, 211, 153, 0.06), transparent);
  color: var(--text);
  line-height: 1.5;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

header {
  margin-bottom: 2rem;
}

header h1 {
  margin: 0 0 0.35rem;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 900px) {
  .grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .grid .span-full {
    grid-column: 1 / -1;
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.95rem;
}

input[type="text"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 158, 255, 0.2);
}

.field {
  margin-bottom: 1rem;
}

.field:last-child {
  margin-bottom: 0;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  background: var(--surface-2);
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(59, 158, 255, 0.06);
}

.dropzone-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  opacity: 0.7;
}

.dropzone p {
  margin: 0.25rem 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.dropzone strong {
  color: var(--accent);
}

.dropzone input {
  display: none;
}

.hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.file-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  max-height: 220px;
  overflow-y: auto;
}

.file-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.65rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  font-size: 0.88rem;
}

.file-list li:last-child {
  margin-bottom: 0;
}

.file-thumb {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  object-fit: cover;
  background: var(--surface-2);
  flex-shrink: 0;
}

.file-icon {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.file-meta {
  flex: 1;
  min-width: 0;
}

.file-meta .name {
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
}

.file-meta .size {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  font-size: 1.1rem;
  line-height: 1;
}

.btn-remove:hover {
  color: var(--error);
  background: rgba(248, 113, 113, 0.1);
}

.json-upload {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.json-upload input[type="file"] {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.json-name {
  font-size: 0.85rem;
  color: var(--success);
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.btn {
  padding: 0.7rem 1.35rem;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

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

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

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

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border);
}

.status-bar {
  display: none;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--surface-2);
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.status-bar.visible {
  display: flex;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

.alert {
  padding: 0.85rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.alert-error {
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.35);
  color: var(--error);
}

.alert-success {
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.3);
  color: var(--success);
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.meta-item {
  background: var(--surface-2);
  border-radius: 8px;
  padding: 0.65rem 0.85rem;
}

.meta-item .label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.15rem;
}

.meta-item .value {
  font-size: 0.95rem;
  font-weight: 600;
}

.tabs {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.tab {
  padding: 0.45rem 0.9rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
}

.tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.panel {
  display: none;
}

.panel.active {
  display: block;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.data-table tr:hover td {
  background: rgba(59, 158, 255, 0.04);
}

.data-table .null-val {
  color: var(--text-muted);
  font-style: italic;
}

.json-output {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin: 0;
  overflow: auto;
  max-height: 480px;
  font-size: 0.8rem;
  line-height: 1.45;
  font-family: "Cascadia Code", "Fira Code", Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
}

.empty-state p {
  margin: 0;
}