/* ============================================================
   Pay Invoice Widget — Professional, clean, trust-inspiring
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600&family=DM+Mono:wght@400;500&display=swap');

:root {
  --pi-bg:           #F8F7F4;
  --pi-surface:      #FFFFFF;
  --pi-border:       #E4E2DC;
  --pi-border-focus: #1A1A1A;
  --pi-text:         #1A1A1A;
  --pi-text-muted:   #6B6860;
  --pi-accent:       #1A1A1A;
  --pi-accent-hover: #333333;
  --pi-success:      #1B6B3A;
  --pi-success-bg:   #EEF7F2;
  --pi-error:        #B91C1C;
  --pi-error-bg:     #FEF2F2;
  --pi-warning-bg:   #FFFBEB;
  --pi-radius:       8px;
  --pi-radius-lg:    12px;
  --pi-shadow:       0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --pi-shadow-lg:    0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.05);
  --pi-font:         'DM Sans', -apple-system, sans-serif;
  --pi-font-mono:    'DM Mono', 'Courier New', monospace;
  --pi-transition:   0.18s ease;
}

/* ---- Container ---- */
#pi-root {
  font-family: var(--pi-font);
  color: var(--pi-text);
  max-width: 520px;
  margin: 0 auto;
}

.pi-card {
  background: var(--pi-surface);
  border: 1px solid var(--pi-border);
  border-radius: var(--pi-radius-lg);
  padding: 40px;
  box-shadow: var(--pi-shadow-lg);
}

/* ---- Header ---- */
.pi-header {
  margin-bottom: 32px;
}

.pi-header-lockup {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.pi-lock-icon {
  width: 36px;
  height: 36px;
  background: var(--pi-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.pi-lock-icon svg {
  width: 18px;
  height: 18px;
  color: white;
}

.pi-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.3px;
  line-height: 1.3;
  margin: 0;
}

.pi-subtitle {
  font-size: 14px;
  color: var(--pi-text-muted);
  margin: 0;
  line-height: 1.5;
}

/* ---- Step indicator ---- */
.pi-steps {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 28px;
}

.pi-step {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--pi-text-muted);
}

.pi-step.active {
  color: var(--pi-text);
}

.pi-step.done {
  color: var(--pi-success);
}

.pi-step-num {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  flex-shrink: 0;
}

.pi-step.active .pi-step-num {
  background: var(--pi-accent);
  border-color: var(--pi-accent);
  color: white;
}

.pi-step.done .pi-step-num {
  background: var(--pi-success);
  border-color: var(--pi-success);
  color: white;
}

.pi-step-connector {
  flex: 1;
  height: 1px;
  background: var(--pi-border);
  margin: 0 10px;
}

/* ---- Form fields ---- */
.pi-field {
  margin-bottom: 18px;
}

.pi-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--pi-text);
  letter-spacing: 0.1px;
}

.pi-input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--pi-border);
  border-radius: var(--pi-radius);
  font-size: 15px;
  font-family: var(--pi-font);
  color: var(--pi-text);
  background: var(--pi-bg);
  transition: border-color var(--pi-transition), box-shadow var(--pi-transition);
  box-sizing: border-box;
  outline: none;
  -webkit-appearance: none;
}

.pi-input:focus {
  border-color: var(--pi-border-focus);
  background: white;
  box-shadow: 0 0 0 3px rgba(26,26,26,0.06);
}

.pi-input.pi-mono {
  font-family: var(--pi-font-mono);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.pi-input::placeholder {
  color: #BEBAB2;
}

/* ---- Button ---- */
.pi-btn {
  width: 100%;
  padding: 13px 20px;
  background: var(--pi-accent);
  color: white;
  border: none;
  border-radius: var(--pi-radius);
  font-size: 15px;
  font-family: var(--pi-font);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--pi-transition), transform var(--pi-transition), opacity var(--pi-transition);
  letter-spacing: -0.1px;
  margin-top: 8px;
  position: relative;
  overflow: hidden;
}

.pi-btn:hover:not(:disabled) {
  background: var(--pi-accent-hover);
  transform: translateY(-1px);
}

.pi-btn:active:not(:disabled) {
  transform: translateY(0);
}

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

.pi-btn.pi-btn-outline {
  background: transparent;
  color: var(--pi-text);
  border: 1px solid var(--pi-border);
}

.pi-btn.pi-btn-outline:hover:not(:disabled) {
  background: var(--pi-bg);
  transform: none;
}

/* ---- Spinner ---- */
.pi-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: pi-spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 8px;
}

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

/* ---- Invoice summary card ---- */
.pi-invoice-summary {
  background: var(--pi-bg);
  border: 1px solid var(--pi-border);
  border-radius: var(--pi-radius);
  padding: 20px;
  margin-bottom: 24px;
}

.pi-summary-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 10px;
  font-size: 14px;
}

.pi-summary-row:last-child {
  margin-bottom: 0;
}

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

.pi-summary-value {
  font-weight: 500;
  text-align: right;
}

.pi-summary-row.pi-total {
  border-top: 1px solid var(--pi-border);
  padding-top: 12px;
  margin-top: 4px;
  font-size: 16px;
}

.pi-summary-row.pi-total .pi-summary-label {
  color: var(--pi-text);
  font-weight: 600;
}

.pi-summary-row.pi-total .pi-summary-value {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.5px;
}

/* ---- Stripe card element container ---- */
.pi-stripe-element {
  background: var(--pi-bg);
  border: 1px solid var(--pi-border);
  border-radius: var(--pi-radius);
  padding: 12px 14px;
  transition: border-color var(--pi-transition), box-shadow var(--pi-transition);
  margin-bottom: 18px;
  min-height: 44px;
}

.pi-stripe-element.StripeElement--focus {
  border-color: var(--pi-border-focus);
  box-shadow: 0 0 0 3px rgba(26,26,26,0.06);
}

.pi-stripe-element.StripeElement--invalid {
  border-color: var(--pi-error);
}

/* ---- Alert messages ---- */
.pi-alert {
  padding: 12px 14px;
  border-radius: var(--pi-radius);
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.pi-alert-icon {
  flex-shrink: 0;
  margin-top: 1px;
}

.pi-alert.error {
  background: var(--pi-error-bg);
  color: var(--pi-error);
  border: 1px solid rgba(185,28,28,0.15);
}

.pi-alert.success {
  background: var(--pi-success-bg);
  color: var(--pi-success);
  border: 1px solid rgba(27,107,58,0.15);
}

/* ---- Security badge ---- */
.pi-security-note {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--pi-text-muted);
  margin-top: 14px;
  justify-content: center;
}

.pi-security-note svg {
  flex-shrink: 0;
}

/* ---- Success state ---- */
.pi-success-state {
  text-align: center;
  padding: 16px 0;
}

.pi-success-icon {
  width: 60px;
  height: 60px;
  background: var(--pi-success-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.pi-success-icon svg {
  width: 28px;
  height: 28px;
  color: var(--pi-success);
}

.pi-success-title {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: -0.3px;
}

.pi-success-body {
  font-size: 14px;
  color: var(--pi-text-muted);
  line-height: 1.6;
  margin: 0 0 24px;
  max-width: 340px;
  margin-left: auto;
  margin-right: auto;
}

.pi-receipt-box {
  background: var(--pi-bg);
  border: 1px solid var(--pi-border);
  border-radius: var(--pi-radius);
  padding: 16px 20px;
  text-align: left;
  margin-bottom: 20px;
}

/* ---- Divider ---- */
.pi-divider {
  height: 1px;
  background: var(--pi-border);
  margin: 24px 0;
}

/* ---- Back link ---- */
.pi-back {
  background: none;
  border: none;
  color: var(--pi-text-muted);
  font-size: 13px;
  font-family: var(--pi-font);
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 20px;
  transition: color var(--pi-transition);
}

.pi-back:hover {
  color: var(--pi-text);
}

/* ---- Responsive ---- */
@media (max-width: 560px) {
  .pi-card {
    padding: 28px 22px;
    border-radius: var(--pi-radius);
  }
}