:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2333;
  --border-color: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --accent-dim: #1f6feb;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --card-shadow: 0 2px 12px rgba(0,0,0,0.4);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px;
}

header {
  text-align: center;
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 32px;
}

header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

header h1 .icon {
  margin-right: 8px;
}

header p {
  color: var(--text-secondary);
  font-size: 15px;
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--card-shadow);
  transition: border-color var(--transition);
}

.card:hover {
  border-color: var(--accent-dim);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-title .badge {
  font-size: 11px;
  background: var(--accent-dim);
  color: #fff;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
}

.upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-tertiary);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(88,166,255,0.05);
}

.upload-zone .icon {
  font-size: 40px;
  margin-bottom: 12px;
  display: block;
}

.upload-zone p {
  color: var(--text-secondary);
  font-size: 14px;
}

.upload-zone .filename {
  color: var(--accent);
  font-weight: 600;
  margin-top: 8px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--accent);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238b949e' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  outline: none;
}

.btn-primary {
  background: var(--accent-dim);
  color: #fff;
  width: 100%;
}

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

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

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

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-danger {
  background: rgba(248,81,73,0.15);
  color: var(--danger);
  border: 1px solid rgba(248,81,73,0.3);
}

.btn-danger:hover {
  background: rgba(248,81,73,0.25);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
}

.loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(13,17,23,0.85);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.loading-overlay.active {
  display: flex;
}

.loading-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 48px;
  text-align: center;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

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

.loading-box p {
  color: var(--text-secondary);
  font-size: 14px;
}

#results {
  display: none;
}

#results.active {
  display: block;
}

.result-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  overflow: hidden;
}

.result-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  user-select: none;
}

.result-card-header .icon {
  font-size: 18px;
}

.result-card-header h3 {
  font-size: 15px;
  font-weight: 600;
  flex: 1;
}

.result-card-header .toggle {
  color: var(--text-muted);
  font-size: 12px;
  transition: transform var(--transition);
}

.result-card.collapsed .toggle {
  transform: rotate(-90deg);
}

.result-card.collapsed .result-card-body {
  display: none;
}

.result-card-body {
  padding: 20px;
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.info-item {
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border-radius: var(--radius);
}

.info-item .label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.info-item .value {
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 500;
}

.info-item.full {
  grid-column: 1 / -1;
}

.code-block {
  position: relative;
  background: #0d1117;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
}

.code-block pre {
  padding: 16px;
  overflow-x: auto;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.5;
  color: #e6edf3;
  white-space: pre;
  tab-size: 4;
}

.code-block .copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 10px;
  font-size: 12px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
}

.code-block .copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.text-content {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.text-content ul {
  padding-left: 20px;
  margin-top: 8px;
}

.text-content li {
  margin-bottom: 6px;
}

.admin-login {
  max-width: 400px;
  margin: 80px auto;
}

.admin-login h2 {
  text-align: center;
  margin-bottom: 24px;
  font-size: 22px;
}

.admin-dashboard {
  display: none;
}

.admin-dashboard.active {
  display: block;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  text-align: center;
}

.stat-item .stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
}

.stat-item .stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.history-table th {
  text-align: left;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
}

.history-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.history-table tr:hover td {
  background: rgba(88,166,255,0.04);
}

.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  z-index: 2000;
  transform: translateX(120%);
  transition: transform 0.3s ease;
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  background: rgba(63,185,80,0.15);
  color: var(--success);
  border: 1px solid rgba(63,185,80,0.3);
}

.toast.error {
  background: rgba(248,81,73,0.15);
  color: var(--danger);
  border: 1px solid rgba(248,81,73,0.3);
}

.toast.warning {
  background: rgba(210,153,34,0.15);
  color: var(--warning);
  border: 1px solid rgba(210,153,34,0.3);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--accent);
  background: rgba(88,166,255,0.08);
  text-decoration: none;
}

.header-nav {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 24px 0;
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

.empty-state .icon {
  font-size: 36px;
  margin-bottom: 12px;
  display: block;
}

@media (max-width: 640px) {
  .form-row {
    grid-template-columns: 1fr;
  }
  .info-grid {
    grid-template-columns: 1fr;
  }
  .container {
    padding: 16px 12px;
  }
  header h1 {
    font-size: 22px;
  }
}