:root {
  --brand-green: #25bd2f;
  --brand-green-hover: #1da928;
  --brand-green-glow: rgba(37, 189, 47, 0.3);
  --bg-color: #0f0f0f;
  --secondary-bg: #1a1a1a;
  --tertiary-bg: #1f1f1f;
  --text-color: #ffffff;
  --text-muted: #9ca3af;
  --border-color: #333;
  --error-color: #ef4444;
  --success-color: #10b981;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: var(--font);
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.logo {
  display: block;
  margin: 0 auto;
  width: 96px;
  height: 96px;
  object-fit: contain;
  filter: drop-shadow(0 0 25px var(--brand-green-glow));
}

.payment-screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: radial-gradient(ellipse at top, rgba(37, 189, 47, 0.08) 0%, transparent 50%),
    var(--bg-color);
}

.payment-content {
  width: 100%;
  max-width: 500px;
}

.payment-header {
  text-align: center;
  margin-bottom: 2rem;
}

.payment-title {
  font-size: 1.75rem;
  color: var(--text-color);
  margin-top: 1rem;
}

.payment-subtitle {
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.pricing-info {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  background: rgba(37, 189, 47, 0.08);
  border: 1px solid rgba(37, 189, 47, 0.25);
  border-radius: 12px;
  text-align: center;
}

.pricing-info p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.pricing-info .delivery-fee {
  margin-top: 0.5rem;
  color: var(--brand-green);
  font-weight: 600;
}

.card-box {
  border: 1px solid var(--brand-green);
  border-radius: 12px;
  padding: 1.5rem;
  background-color: var(--secondary-bg);
  box-shadow: 0 0 10px rgba(37, 189, 47, 0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-box-static {
  transform: none !important;
}

.payment-options {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.payment-option {
  flex: 1;
  padding: 1rem;
  background: var(--tertiary-bg);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
  color: var(--text-color);
}

.payment-option:hover {
  border-color: var(--brand-green);
  background: rgba(37, 189, 47, 0.05);
}

.payment-option.selected {
  border-color: var(--brand-green);
  background: rgba(37, 189, 47, 0.1);
  box-shadow: 0 0 0 3px var(--brand-green-glow);
}

.payment-option-label {
  font-weight: 700;
  font-size: 1.1rem;
}

.payment-option-amount {
  color: var(--brand-green);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.payment-box {
  background: var(--tertiary-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-muted);
  font-size: 0.9rem;
}

input {
  background-color: var(--tertiary-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  width: 100%;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  font-family: var(--font);
}

input:focus {
  outline: none;
  border-color: var(--brand-green);
  box-shadow: 0 0 0 3px var(--brand-green-glow);
}

button {
  background-color: var(--brand-green);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font);
}

button:hover {
  background-color: var(--brand-green-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 189, 47, 0.3);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-full {
  width: 100%;
}

.payment-detail {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.payment-detail:last-child {
  border-bottom: none;
}

.payment-detail-label {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.payment-detail-value {
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Mono', monospace;
  font-size: 0.875rem;
  color: var(--text-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.payment-detail-address {
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.payment-address-value {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.payment-address-text {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.copy-btn {
  background: var(--brand-green);
  color: #000;
  border: none;
  border-radius: 6px;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.75rem;
}

.copy-btn:hover {
  background: var(--brand-green-hover);
}

.info-box {
  background: rgba(37, 189, 47, 0.08);
  border: 1px solid rgba(37, 189, 47, 0.25);
  border-radius: 10px;
  padding: 1rem;
}

.warning-box {
  background: rgba(255, 152, 0, 0.1);
  border: 1px solid rgba(255, 152, 0, 0.4);
  border-radius: 10px;
  padding: 1rem;
}

.error-message {
  color: var(--error-color);
  font-size: 0.875rem;
  margin-top: 0.5rem;
  padding: 0.75rem;
  background: rgba(239, 68, 68, 0.1);
  border-radius: 6px;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.status-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 1rem;
  background: rgba(37, 189, 47, 0.08);
  border-radius: 8px;
}

.status-label {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.status-value {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
}

.spinner-small {
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* --- Modal for verification code --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1.5rem;
}

.modal {
  background: var(--secondary-bg);
  border-radius: 16px;
  border: 1px solid var(--brand-green);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.9);
  max-width: 420px;
  width: 100%;
  padding: 1.75rem 1.5rem 1.5rem;
  text-align: center;
}

.modal-title {
  font-size: 1.5rem;
  margin: 0 0 0.75rem;
  color: var(--text-color);
}

.modal-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 1rem;
}

.modal-text.small {
  font-size: 0.8rem;
}

.modal-code-box {
  border-radius: 12px;
  border: 1px dashed var(--brand-green);
  padding: 1rem;
  margin-bottom: 1rem;
}

.modal-code {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--brand-green);
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Mono', monospace;
  word-break: break-all;
  margin-bottom: 0.75rem;
}

/* --- Coin Select (custom dropdown) --- */
.coin-select-container {
  position: relative;
}

.coin-select-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--tertiary-bg);
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.coin-select-toggle:hover {
  border-color: var(--brand-green);
  background: rgba(37, 189, 47, 0.04);
}

.coin-select-toggle.open {
  border-color: var(--brand-green);
  box-shadow: 0 0 0 3px var(--brand-green-glow);
}

.coin-select-main {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.coin-select-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.coin-select-arrow {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.coin-select-dropdown {
  position: absolute;
  top: calc(100% + 0.4rem);
  left: 0;
  right: 0;
  z-index: 20;
  background: var(--secondary-bg);
  border-radius: 10px;
  border: 1px solid var(--border-color);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.7);
  padding: 0.75rem;
  display: none;
}

.coin-select-dropdown.open {
  display: block;
}

.coin-select-dropdown input {
  margin-bottom: 0.75rem;
}

/* Coin selection list for any-coin payments */
.coin-list {
  max-height: 320px;
  overflow-y: auto;
  margin-bottom: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-color);
}

.coin-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-color);
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s, border-left 0.2s;
}

.coin-item:last-child {
  border-bottom: none;
}

.coin-item:hover {
  background: rgba(37, 189, 47, 0.05);
}

.coin-item.selected {
  background: rgba(37, 189, 47, 0.15);
  border-left: 3px solid var(--brand-green);
}

.coin-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: contain;
  background: #000;
}

.coin-info {
  display: flex;
  flex-direction: column;
}

.coin-name {
  color: var(--text-color);
  font-weight: 500;
  font-size: 0.95rem;
}

.coin-network {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.coin-icon-small {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: contain;
  background: #000;
}

@media (max-width: 600px) {
  .payment-options {
    flex-direction: column;
  }
}