:root {
  --volum-black: #050505;
  --volum-dark: #0a0a0a;
  --volum-panel: #0f1115;
  --volum-border: rgba(0, 255, 170, 0.18);
  --volum-teal: #00ffaa;
  --volum-cyan: #00e5ff;
  --volum-green: #00d68f;
  --volum-text: #e8e8e8;
  --volum-muted: #9aa0a6;
  --volum-error: #ff6b6b;
  --volum-success: #00ffaa;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-mono: 'Space Mono', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--volum-black);
  color: var(--volum-text);
  font-family: var(--font-sans);
  min-height: 100vh;
}

body {
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 255, 170, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(0, 229, 255, 0.04) 0%, transparent 40%),
    var(--volum-black);
  background-attachment: fixed;
}

.embed-shell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.module-shell {
  width: 100%;
  max-width: 460px;
  background: var(--volum-panel);
  border: 1px solid var(--volum-border);
  border-radius: 20px;
  padding: 32px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(0, 255, 170, 0.05);
  position: relative;
  overflow: hidden;
}

.module-shell::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--volum-green), var(--volum-cyan));
  opacity: 0.7;
}

.presale-header {
  text-align: center;
  margin-bottom: 28px;
}

.presale-eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--volum-teal);
  margin-bottom: 10px;
}

.presale-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 600;
  margin: 0 0 8px;
  color: #fff;
}

.presale-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 16px;
  color: var(--volum-cyan);
  margin: 0;
}

.presale-stage {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--volum-muted);
  border: 1px solid var(--volum-border);
  border-radius: 999px;
  padding: 6px 14px;
  margin-bottom: 24px;
}

.presale-stage-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--volum-teal);
  box-shadow: 0 0 8px var(--volum-teal);
}

.input-group {
  margin-bottom: 18px;
}

.input-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--volum-muted);
  margin-bottom: 8px;
}

.input-wrap {
  position: relative;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--volum-border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  padding: 4px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrap:focus-within {
  border-color: var(--volum-teal);
  box-shadow: 0 0 0 3px rgba(0, 255, 170, 0.08);
}

.input-field {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: #fff;
  font-size: 18px;
  font-weight: 500;
  padding: 14px 12px;
  font-family: var(--font-sans);
}

.input-field::placeholder {
  color: #555;
}

.input-unit {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--volum-teal);
  padding: 0 12px;
}

.input-hint {
  font-size: 11px;
  color: var(--volum-muted);
  margin-top: 6px;
}

.error-message {
  color: var(--volum-error);
  font-size: 12px;
  margin-top: 6px;
  display: none;
}

.error-message.visible {
  display: block;
}

.summary-box {
  background: rgba(0, 255, 170, 0.04);
  border: 1px solid var(--volum-border);
  border-radius: 12px;
  padding: 18px;
  margin: 24px 0;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 13px;
}

.summary-row:last-child {
  margin-bottom: 0;
  padding-top: 10px;
  border-top: 1px solid var(--volum-border);
}

.summary-label {
  color: var(--volum-muted);
}

.summary-value {
  color: #fff;
  font-weight: 600;
}

.summary-total {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--volum-teal);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 12px;
  padding: 16px 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.15s, opacity 0.15s, box-shadow 0.15s;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(90deg, var(--volum-green), var(--volum-cyan));
  color: var(--volum-black);
  font-weight: 700;
  width: 100%;
  box-shadow: 0 8px 24px rgba(0, 255, 170, 0.18);
}

.button-primary:hover {
  box-shadow: 0 10px 30px rgba(0, 255, 170, 0.28);
}

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

.button-secondary {
  background: transparent;
  border: 1px solid var(--volum-border);
  color: var(--volum-text);
}

.trust-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 20px;
}

.trust-row img {
  width: 22px;
  height: 22px;
  opacity: 0.7;
}

.trust-label {
  font-size: 11px;
  color: var(--volum-muted);
}

.status-waiting {
  text-align: center;
  padding: 40px 20px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 2px solid var(--volum-border);
  border-top-color: var(--volum-teal);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

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

/* Payment gateway styles */
.app-shell {
  position: relative;
  min-height: 100vh;
  padding: 24px;
  overflow: hidden;
}

.ambient-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.18;
  pointer-events: none;
}

.ambient-orb.a {
  width: 400px;
  height: 400px;
  background: var(--volum-green);
  top: -100px;
  right: -100px;
}

.ambient-orb.b {
  width: 300px;
  height: 300px;
  background: var(--volum-cyan);
  bottom: -80px;
  left: -80px;
}

.shell-inner {
  max-width: 480px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.brand-row {
  text-align: center;
  margin-bottom: 28px;
}

.brand-logo {
  height: 36px;
}

.checkout-shell {
  background: var(--volum-panel);
  border: 1px solid var(--volum-border);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.checkout-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.checkout-merchant-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.checkout-merchant-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.checkout-merchant-line {
  font-size: 12px;
  color: var(--volum-muted);
}

.icon-action-button {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--volum-border);
  background: transparent;
  color: var(--volum-teal);
  cursor: pointer;
}

.checkout-header-block {
  text-align: center;
  margin-bottom: 24px;
}

.checkout-total-amount {
  font-family: var(--font-serif);
  font-size: 36px;
  color: #fff;
  margin-bottom: 8px;
}

.checkout-main-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--volum-border);
  border-radius: 16px;
  padding: 20px;
}

.field-block {
  margin-bottom: 18px;
}

.field-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--volum-muted);
  margin-bottom: 8px;
}

.picker-block {
  position: relative;
}

.picker-display {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--volum-border);
  border-radius: 12px;
  padding: 12px 14px;
  color: #fff;
  cursor: pointer;
}

.picker-value {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.picker-chevron {
  color: var(--volum-muted);
}

.picker-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--volum-panel);
  border: 1px solid var(--volum-border);
  border-radius: 12px;
  padding: 6px;
  z-index: 10;
}

.picker-option {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: #fff;
  cursor: pointer;
}

.picker-option:hover {
  background: rgba(0, 255, 170, 0.08);
}

.picker-option img {
  width: 22px;
  height: 22px;
}

.quote-summary {
  margin: 24px 0;
  padding-top: 18px;
  border-top: 1px solid var(--volum-border);
}

.quote-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 13px;
}

.quote-row strong {
  color: #fff;
}

.button-full {
  width: 100%;
}

.payment-address-block {
  text-align: center;
}

.payment-address-block label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--volum-muted);
  margin-bottom: 12px;
}

.address-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--volum-border);
  border-radius: 12px;
  padding: 12px 14px;
  word-break: break-all;
}

.address-box code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: #fff;
}

.copy-button {
  background: transparent;
  border: 1px solid var(--volum-border);
  border-radius: 8px;
  color: var(--volum-teal);
  padding: 6px 10px;
  font-size: 11px;
  cursor: pointer;
  white-space: nowrap;
}

.qr-code {
  margin: 20px auto;
  width: 180px;
  height: 180px;
}

.qr-code img, .qr-code canvas {
  width: 100%;
  height: 100%;
}

.or-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
  font-size: 11px;
  color: var(--volum-muted);
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.or-divider::before,
.or-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--volum-border);
}

.wallet-status {
  text-align: center;
  font-size: 12px;
  color: var(--volum-muted);
  margin-top: 10px;
}

.countdown {
  text-align: center;
  margin-top: 20px;
  font-size: 12px;
  color: var(--volum-muted);
}

.countdown-timer {
  color: var(--volum-teal);
  font-family: var(--font-mono);
}

.success-card {
  text-align: center;
}

.success-card h2 {
  font-family: var(--font-serif);
  color: var(--volum-teal);
}

.error-card h2 {
  font-family: var(--font-serif);
  color: var(--volum-error);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--volum-border);
}

.status-waiting {
  color: #f0c000;
}

.status-confirmed {
  color: var(--volum-teal);
  border-color: var(--volum-teal);
}

.status-expired {
  color: var(--volum-error);
  border-color: var(--volum-error);
}

[hidden] {
  display: none !important;
}

@media (max-width: 520px) {
  .module-shell, .checkout-shell {
    padding: 22px;
  }
  .presale-title {
    font-size: 24px;
  }
}