:root {
  color-scheme: light;
  --bg: #f4f4f8;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-solid: #ffffff;
  --surface-subtle: #f7f7fb;
  --text: #17171f;
  --text-soft: #555565;
  --text-faint: #858595;
  --border: rgba(23, 23, 31, 0.1);
  --border-strong: rgba(23, 23, 31, 0.16);
  --accent: #635bff;
  --accent-strong: #4f46e5;
  --accent-button: #635bff;
  --accent-button-hover: #4f46e5;
  --accent-button-text: #ffffff;
  --accent-soft: rgba(99, 91, 255, 0.1);
  --success: #0f7b5f;
  --success-soft: rgba(15, 123, 95, 0.1);
  --danger: #b4233c;
  --danger-soft: rgba(180, 35, 60, 0.08);
  --warning: #956000;
  --warning-soft: rgba(149, 96, 0, 0.11);
  --shadow: 0 24px 70px rgba(30, 28, 60, 0.1);
  --radius-lg: 26px;
  --radius-md: 14px;
  --font: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0d0d12;
    --surface: rgba(23, 23, 30, 0.84);
    --surface-solid: #17171e;
    --surface-subtle: #1d1d26;
    --text: #f4f4f7;
    --text-soft: #b7b7c4;
    --text-faint: #8a8a99;
    --border: rgba(255, 255, 255, 0.09);
    --border-strong: rgba(255, 255, 255, 0.16);
    --accent: #8b85ff;
    --accent-strong: #a39eff;
    --accent-button: #5b52f0;
    --accent-button-hover: #4f46e5;
    --accent-button-text: #ffffff;
    --accent-soft: rgba(139, 133, 255, 0.14);
    --success: #5ee0b8;
    --success-soft: rgba(94, 224, 184, 0.1);
    --danger: #ff8fa3;
    --danger-soft: rgba(255, 143, 163, 0.1);
    --warning: #f0bd66;
    --warning-soft: rgba(240, 189, 102, 0.12);
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 15% 0%, rgba(99, 91, 255, 0.12), transparent 35rem),
    radial-gradient(circle at 100% 100%, rgba(41, 209, 172, 0.09), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

a {
  color: inherit;
}

.ambient {
  position: fixed;
  z-index: 0;
  width: 28rem;
  height: 28rem;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.4;
  pointer-events: none;
}

.ambient-one {
  top: -16rem;
  right: -10rem;
  background: rgba(99, 91, 255, 0.22);
}

.ambient-two {
  bottom: -18rem;
  left: -12rem;
  background: rgba(41, 209, 172, 0.14);
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
  padding: 32px 0 28px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: clamp(42px, 7vw, 76px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(99, 91, 255, 0.2);
  border-radius: 13px;
  background: var(--accent-soft);
  color: var(--accent);
}

.brand-mark svg {
  width: 23px;
  height: 23px;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.18;
}

.brand-name {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.brand-sub {
  color: var(--text-faint);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.mode-badge {
  padding: 5px 10px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.11em;
}

.mode-badge.test {
  border-color: rgba(149, 96, 0, 0.18);
  background: var(--warning-soft);
  color: var(--warning);
}

.mode-badge.live {
  border-color: rgba(180, 35, 60, 0.2);
  background: var(--danger-soft);
  color: var(--danger);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.8fr);
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.panel {
  min-height: 550px;
  padding: clamp(28px, 5vw, 54px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px);
}

.panel-head {
  margin-bottom: 34px;
}

.kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.17em;
}

h1 {
  margin: 0;
  font-size: clamp(32px, 5vw, 46px);
  font-weight: 680;
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.lede {
  max-width: 34em;
  margin: 14px 0 0;
  color: var(--text-soft);
  font-size: 15px;
}

.state-block {
  display: flex;
  min-height: 200px;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-faint);
  font-size: 14px;
}

.spinner,
.button-spinner {
  display: inline-block;
  width: 17px;
  height: 17px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.field-block {
  margin-bottom: 22px;
}

.field-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.field-head label,
.field-label {
  color: var(--text-soft);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.015em;
}

.secure-note {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--text-faint);
  font-size: 11px;
  font-weight: 550;
}

.secure-note svg {
  width: 13px;
  height: 13px;
}

.payment-element {
  min-height: 104px;
}

.payment-element.is-loading {
  border-radius: var(--radius-md);
  background: linear-gradient(
    100deg,
    var(--surface-subtle) 20%,
    var(--surface-solid) 40%,
    var(--surface-subtle) 60%
  );
  background-size: 200% 100%;
  animation: shimmer 1.4s ease-in-out infinite;
}

@keyframes shimmer {
  to {
    background-position: -200% 0;
  }
}

.consent {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  margin: 20px 0 4px;
  color: var(--text-soft);
  cursor: pointer;
  font-size: 12.5px;
  line-height: 1.55;
}

.consent input {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  margin: 2px 0 0;
  accent-color: var(--accent);
}

.alert {
  margin-top: 18px;
  padding: 12px 14px;
  border: 1px solid transparent;
  border-radius: 11px;
  font-size: 13px;
}

.alert-error {
  border-color: rgba(180, 35, 60, 0.16);
  background: var(--danger-soft);
  color: var(--danger);
}

.primary-button {
  display: flex;
  width: 100%;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 22px;
  border: 0;
  border-radius: 13px;
  background: var(--accent-button);
  box-shadow: 0 10px 24px rgba(99, 91, 255, 0.22);
  color: var(--accent-button-text);
  cursor: pointer;
  font-size: 14px;
  font-weight: 680;
  transition:
    transform 160ms ease,
    background 160ms ease,
    box-shadow 160ms ease;
}

.primary-button:hover:not(:disabled) {
  background: var(--accent-button-hover);
  box-shadow: 0 13px 28px rgba(99, 91, 255, 0.3);
  transform: translateY(-1px);
}

.primary-button:active:not(:disabled) {
  transform: translateY(0);
}

.primary-button:focus-visible {
  outline: 3px solid var(--accent-soft);
  outline-offset: 3px;
}

.primary-button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

[hidden] {
  display: none !important;
}

.fine-print {
  margin: 16px 3px 0;
  color: var(--text-faint);
  font-size: 11.5px;
  line-height: 1.6;
}

.side-panel {
  display: flex;
  flex-direction: column;
  gap: 34px;
  padding-top: 8px;
}

.side-label {
  margin: 0 0 18px;
  color: var(--text-faint);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  display: flex;
  gap: 15px;
}

.step-number {
  flex: 0 0 auto;
  padding-top: 1px;
  color: var(--accent);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.steps strong {
  display: block;
  margin-bottom: 3px;
  font-size: 13px;
  font-weight: 650;
}

.steps p {
  margin: 0;
  color: var(--text-soft);
  font-size: 12.5px;
  line-height: 1.65;
}

.limit-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.limit-list li {
  position: relative;
  padding-left: 15px;
  color: var(--text-soft);
  font-size: 12.5px;
  line-height: 1.65;
}

.limit-list li::before {
  position: absolute;
  top: 0.68em;
  left: 0;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-faint);
  content: "";
}

.boundary-note {
  padding: 15px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-subtle);
  color: var(--text-faint);
  font-size: 11.5px;
  line-height: 1.65;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: 38px;
  color: var(--text-faint);
  font-size: 10.5px;
}

.result-state:focus {
  outline: none;
}

.result-card {
  animation: rise 360ms ease both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}

.result-icon {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  margin-bottom: 22px;
  border-radius: 50%;
}

.result-icon svg {
  width: 24px;
  height: 24px;
}

.result-icon.success {
  background: var(--success-soft);
  color: var(--success);
}

.result-icon.failure {
  background: var(--danger-soft);
  color: var(--danger);
}

.result-icon.pending {
  background: var(--warning-soft);
  color: var(--warning);
}

.result-title {
  margin: 0;
  font-size: 27px;
  font-weight: 670;
  letter-spacing: -0.035em;
  line-height: 1.18;
}

.result-subtitle {
  margin: 9px 0 0;
  color: var(--text-soft);
  font-size: 13.5px;
}

.card-summary {
  display: flex;
  align-items: center;
  gap: 15px;
  margin: 28px 0 8px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--surface-subtle);
}

.card-brand {
  display: grid;
  width: 54px;
  height: 35px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-solid);
  color: var(--text-soft);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.card-number {
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  font-weight: 650;
  letter-spacing: 0.035em;
}

.card-expiry {
  margin-top: 1px;
  color: var(--text-faint);
  font-size: 11px;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.detail {
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.detail-label {
  display: block;
  margin-bottom: 5px;
  color: var(--text-faint);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.04em;
}

.detail-value {
  font-size: 12.5px;
  font-weight: 600;
}

.detail-value.pass {
  color: var(--success);
}

.detail-value.fail {
  color: var(--danger);
}

.detail-value.neutral {
  color: var(--text-faint);
}

.result-error {
  margin-top: 20px;
  padding: 14px 15px;
  border: 1px solid rgba(180, 35, 60, 0.16);
  border-radius: 12px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 13px;
  line-height: 1.6;
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.secondary-button,
.text-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 620;
  text-decoration: none;
  transition:
    border-color 150ms ease,
    background 150ms ease;
}

.secondary-button {
  padding: 0 18px;
}

.secondary-button:hover,
.text-button:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.noscript {
  position: fixed;
  right: 20px;
  bottom: 20px;
  left: 20px;
  z-index: 10;
  padding: 14px;
  border-radius: 10px;
  background: var(--danger-soft);
  color: var(--danger);
  text-align: center;
  font-size: 13px;
}

@media (max-width: 820px) {
  .page-shell {
    width: min(100% - 32px, 640px);
    padding-top: 22px;
  }

  .topbar {
    margin-bottom: 36px;
  }

  .layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .panel {
    min-height: 0;
    padding: 28px 22px;
    border-radius: 22px;
  }

  .side-panel {
    gap: 28px;
    padding: 0 2px;
  }

  .footer {
    margin-top: 30px;
  }
}

@media (max-width: 460px) {
  h1 {
    font-size: 31px;
  }

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

  .card-number {
    font-size: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Preview mode (no Stripe keys configured) */
.preview-state {
  animation: rise 360ms ease both;
}

.preview-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  padding: 11px 13px;
  border: 1px solid rgba(149, 96, 0, 0.2);
  border-radius: 11px;
  background: var(--warning-soft);
  color: var(--warning);
  font-size: 12px;
  font-weight: 600;
}

.preview-pill {
  padding: 3px 7px;
  border-radius: 999px;
  background: var(--warning);
  color: var(--surface-solid);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.09em;
}

.preview-card {
  padding: 18px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--surface-subtle);
  user-select: none;
}

.preview-card .field-head {
  margin-bottom: 12px;
}

.preview-input {
  display: flex;
  min-height: 46px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface-solid);
}

.preview-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

.preview-placeholder {
  color: var(--text-faint);
  font-size: 12px;
}

.preview-dots {
  color: var(--text-soft);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.preview-card .primary-button {
  cursor: not-allowed;
  opacity: 0.55;
}

.preview-copy {
  margin-top: 24px;
}

.preview-copy h2 {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 660;
  letter-spacing: -0.025em;
}

.preview-copy p {
  margin: 0 0 9px;
  color: var(--text-soft);
  font-size: 12.5px;
  line-height: 1.7;
}

.preview-copy code {
  padding: 1px 5px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface-subtle);
  color: var(--text-soft);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 11px;
}

.mode-badge.preview {
  border-color: rgba(149, 96, 0, 0.18);
  background: var(--warning-soft);
  color: var(--warning);
}