:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #18202f;
  --muted: #647084;
  --line: #d9dee8;
  --blue: #2364d2;
  --green: #16845d;
  --amber: #a15f08;
  --red: #b02a37;
  --soft-blue: #eaf1ff;
  --soft-green: #e9f8f1;
  --soft-amber: #fff4df;
  --shadow: 0 10px 28px rgba(18, 28, 45, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
textarea {
  font: inherit;
}

.app-shell {
  width: min(1180px, calc(100vw - 32px));
  margin: 28px auto 48px;
}

.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: 30px;
  line-height: 1.15;
}

h2 {
  margin-bottom: 4px;
  font-size: 22px;
}

h3 {
  margin-bottom: 4px;
  font-size: 16px;
}

p {
  margin-bottom: 0;
  color: var(--muted);
}

.top-status,
.button-row,
.form-actions,
.segmented,
.wait-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft-blue);
  color: var(--blue);
  font-weight: 700;
  white-space: nowrap;
}

.badge.muted {
  background: #fff;
  color: var(--muted);
}

.badge.ok {
  background: var(--soft-green);
  color: var(--green);
}

.badge.warn {
  background: var(--soft-amber);
  color: var(--amber);
}

.tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  margin-bottom: 18px;
}

.tab {
  appearance: none;
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 12px 14px 10px;
  cursor: pointer;
  white-space: nowrap;
}

.tab.active {
  border-bottom-color: var(--blue);
  color: var(--ink);
  font-weight: 800;
}

.panel {
  display: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 24px;
}

.panel.active {
  display: block;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.panel-head.compact {
  margin-bottom: 12px;
}

.settings-grid,
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.field,
.field-group {
  display: grid;
  gap: 8px;
}

.field span,
.field-group legend,
.label {
  color: #4d5a6d;
  font-size: 13px;
  font-weight: 800;
}

.field-group {
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.choice {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
}

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

small.hint {
  display: block;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 11px 12px;
  outline: none;
}

textarea {
  resize: vertical;
  min-height: 92px;
}

input:focus,
textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(35, 100, 210, 0.14);
}

.span-2 {
  grid-column: 1 / -1;
}

.token-panel {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.button,
.segment {
  appearance: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 10px 14px;
  font-weight: 800;
  cursor: pointer;
}

.button:hover,
.segment:hover {
  border-color: #b8c2d3;
}

.button.primary {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
}

.button.danger {
  border-color: #f0c4ca;
  color: var(--red);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.segment.active {
  border-color: var(--blue);
  background: var(--soft-blue);
  color: var(--blue);
}

.empty-state {
  border: 1px dashed #c5ccda;
  border-radius: 8px;
  color: var(--muted);
  padding: 28px;
  text-align: center;
}

.hidden {
  display: none !important;
}

.payment-layout {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.qr-box {
  display: grid;
  gap: 12px;
}

.qr-box img {
  display: block;
  width: 100%;
  max-width: 300px;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.details {
  min-width: 0;
}

.detail-list {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 10px 14px;
  margin: 0 0 18px;
}

.detail-list dt {
  color: var(--muted);
  font-weight: 800;
}

.detail-list dd {
  margin: 0;
  min-width: 0;
  overflow-wrap: anywhere;
}

.status-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.status-strip > div {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
}

.status-strip strong {
  display: block;
  margin-top: 4px;
  overflow-wrap: anywhere;
}

.json-output {
  min-height: 160px;
  overflow: auto;
  margin: 18px 0 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #111827;
  color: #d9f99d;
  padding: 14px;
}

.success-layout {
  display: grid;
  gap: 18px;
}

.success-mark {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  border: 1px solid #b9e7d2;
  border-radius: 8px;
  background: var(--soft-green);
  color: var(--green);
  padding: 12px 16px;
  font-size: 22px;
  font-weight: 900;
}

.log-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 22px;
}

.log-list li {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcff;
  padding: 12px;
}

.log-list time {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.log-list pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  margin: 8px 0 0;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(18px);
  max-width: min(560px, calc(100vw - 32px));
  border-radius: 8px;
  background: #18202f;
  color: #fff;
  padding: 12px 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 780px) {
  .app-shell {
    width: min(100vw - 20px, 1180px);
    margin-top: 14px;
  }

  .topbar,
  .panel-head {
    align-items: stretch;
    flex-direction: column;
  }

  .settings-grid,
  .form-grid,
  .payment-layout,
  .status-strip {
    grid-template-columns: 1fr;
  }

  .detail-list {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 18px;
  }
}