.demo-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 210px;
  padding: 14px;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.demo-card:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.11), rgba(255, 255, 255, 0.04));
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.demo-card-header {
  display: grid;
  gap: 6px;
}

.demo-card-title {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.demo-card-description {
  color: var(--text-secondary);
  font-size: 13px;
}

.demo-card-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.progress-indicator {
  align-items: center;
  display: flex;
  gap: 10px;
  margin-top: 2px;
}

.progress-bar {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--line);
  border-radius: 999px;
  flex: 1;
  height: 8px;
  overflow: hidden;
}

.progress-bar-fill {
  background: linear-gradient(90deg, #84b5ff, #4f8cff);
  border-radius: 999px;
  height: 100%;
  transition: width 220ms ease;
}

.progress-text {
  color: var(--text-secondary);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  min-width: 42px;
  text-align: right;
}

.demo-card-footer {
  border-top: 1px dashed var(--line);
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: auto;
  padding-top: 9px;
}

.demo-card-code-toggle {
  justify-content: flex-start;
}

.demo-card-code {
  max-height: 0;
  overflow: hidden;
  transition: max-height 260ms ease;
}

.demo-card-code.visible {
  max-height: 620px;
}

.code-block {
  background: #0a0a0a;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.code-header {
  align-items: center;
  background: #0f0f10;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  padding: 8px 10px;
}

.code-language {
  color: var(--text-muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.code-copy-btn {
  min-height: auto;
  padding: 4px 10px;
}

.code-copy-btn.copied {
  border-color: rgba(52, 199, 89, 0.5);
  color: #81e9a2;
}

.code-content {
  max-height: 400px;
  overflow: auto;
  padding: 12px;
}

.code-content pre {
  margin: 0;
}

.code-content code,
.code-content pre,
.code-content .token {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
}

.btn {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  display: inline-flex;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  justify-content: center;
  letter-spacing: 0.04em;
  min-height: 34px;
  padding: 7px 12px;
  text-transform: uppercase;
  transition: all 180ms ease;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.btn-primary {
  background: #f4f4f5;
  border-color: #f4f4f5;
  color: #101014;
}

.btn-primary:hover:not(:disabled) {
  background: #ffffff;
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--line-strong);
}

.btn-danger {
  background: rgba(255, 69, 58, 0.13);
  border-color: rgba(255, 69, 58, 0.45);
  color: #ff918a;
}

.btn-danger:hover:not(:disabled) {
  background: rgba(255, 69, 58, 0.2);
}

.btn-loading {
  color: transparent !important;
  pointer-events: none;
  position: relative;
}

.btn-loading::after {
  animation: spin 0.7s linear infinite;
  border: 2px solid currentColor;
  border-radius: 999px;
  border-top-color: transparent;
  content: '';
  height: 13px;
  left: 50%;
  margin-left: -6.5px;
  margin-top: -6.5px;
  position: absolute;
  top: 50%;
  width: 13px;
}

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

.demo-card .status-message {
  font-size: 12px;
  margin: 2px 0 0;
  padding: 8px 10px;
}