:root {
  --bg: #0f1116;
  --panel: #181b23;
  --panel-2: #20242e;
  --border: #2a2f3a;
  --text: #e8ebf1;
  --muted: #8b92a5;
  --accent: #6366f1;
  --accent-hover: #7c7fff;
  --success: #22c55e;
  --warn: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.5;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
}

h1 {
  margin: 0 0 6px;
  font-size: 24px;
  font-weight: 600;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  max-width: 700px;
}

.header-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

.header-links a:hover {
  color: var(--text);
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding-top: 32px;
  padding-bottom: 48px;
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

h2 {
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

h2:not(:first-child) {
  margin-top: 28px;
}

/* Product */
.product {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--panel-2);
  border-radius: 8px;
}

.product-image {
  width: 60px;
  height: 60px;
  background: var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
}

.product-name {
  font-weight: 600;
}
.product-price {
  color: var(--muted);
  font-size: 14px;
}

/* Scenarios */
.scenarios {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scenario {
  display: flex;
  gap: 12px;
  padding: 12px 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition:
    border-color 0.15s,
    background 0.15s;
}

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

.scenario input[type='radio'] {
  margin-top: 4px;
  accent-color: var(--accent);
}

.scenario:has(input:checked) {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.08);
}

.scenario-title {
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 2px;
}

.scenario-desc {
  font-size: 13px;
  color: var(--muted);
}

/* Pay button */
.pay-btn {
  width: 100%;
  margin-top: 20px;
  padding: 14px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

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

.pay-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Log panel */
.hint {
  margin: -8px 0 16px;
  color: var(--muted);
  font-size: 13px;
}

.log {
  background: #0a0c12;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  min-height: 420px;
  max-height: 600px;
  overflow-y: auto;
}

.log-empty {
  color: var(--muted);
  font-style: italic;
  text-align: center;
  padding: 40px 0;
}

.log-entry {
  display: flex;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
  animation: slideIn 0.2s ease-out;
}

.log-entry:last-child {
  border-bottom: none;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.log-icon {
  flex-shrink: 0;
}

.log-body {
  flex: 1;
  min-width: 0;
}

.log-time {
  color: var(--muted);
  font-size: 11px;
  margin-right: 6px;
}
.log-msg {
  color: var(--text);
}

.log-detail {
  margin-top: 4px;
  padding: 6px 8px;
  background: rgba(255, 255, 255, 0.03);
  border-left: 2px solid var(--border);
  border-radius: 3px;
  color: var(--muted);
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-all;
}

.log-entry.success .log-icon {
  color: var(--success);
}
.log-entry.info .log-icon {
  color: var(--info);
}
.log-entry.warn .log-icon {
  color: var(--warn);
}
.log-entry.error .log-icon {
  color: var(--error);
}
.log-entry.success .log-detail {
  border-left-color: var(--success);
}
.log-entry.info .log-detail {
  border-left-color: var(--info);
}
.log-entry.warn .log-detail {
  border-left-color: var(--warn);
}
.log-entry.error .log-detail {
  border-left-color: var(--error);
}
.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}

/* Summary */
.summary {
  margin-top: 20px;
  padding: 16px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}

.summary.hidden {
  display: none;
}

.summary h3 {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 600;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  color: var(--muted);
}

.summary-row span:last-child {
  color: var(--text);
}

.summary ul {
  margin: 10px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.summary.success {
  border-color: var(--success);
}
.summary.error {
  border-color: var(--error);
}

footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

footer a {
  color: var(--muted);
  text-decoration: underline;
}