/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #f7931a;
  --primary-dark: #d67a0e;
  --primary-light: #fbb44a;
  --primary-gradient: linear-gradient(135deg, #f7931a, #e67e22);
  --primary-gradient-hover: linear-gradient(135deg, #e67e22, #d67a0e);
  --bg: #f0f2f5;
  --card-bg: #ffffff;
  --text-primary: #0a0a1a;
  --text-secondary: #4a4a5a;
  --text-muted: #8a8a9a;
  --border-color: #e4e6eb;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 8px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Menlo", "Monaco", "Cascadia Code", "Roboto Mono",
    monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a12;
    --card-bg: #141420;
    --text-primary: #e8e8f0;
    --text-secondary: #a8a8b8;
    --text-muted: #6a6a7a;
    --border-color: #2a2a3a;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.6);
  }
  .input-wrapper input,
  .input-address-wrapper input {
    background: var(--bg);
    color: var(--text-primary);
  }
  .input-wrapper {
    background: var(--bg);
  }
  .input-card,
  .amount-card,
  .fee-card,
  .payment-card,
  .processing-details {
    background: var(--bg);
  }
  .page-header-main {
    background: linear-gradient(135deg, #0e0e1a, #141420);
  }
  .price-update {
    background: var(--bg);
  }
  .badge {
    background: var(--bg);
  }
  .site-header,
  .site-footer {
    background: var(--card-bg);
    border-color: var(--border-color);
  }
  .header-status {
    background: var(--bg);
  }
  .status-badge.pending {
    background: #3a2a0a;
    color: #fbb44a;
  }
  .status-badge.confirmed {
    background: #0a3a1a;
    color: #4ade80;
  }
  .notice-pending {
    background: #3a2a0a;
    border-color: #7a5a1a;
    color: #fbb44a;
  }
  .notice-confirmed {
    background: #0a3a1a;
    border-color: #1a7a3a;
    color: #4ade80;
  }
  .notice-warning {
    background: #3a2a0a;
    color: #fbb44a;
  }
  .notice-warning svg {
    stroke: #fbb44a;
  }
  .error-box {
    background: #3a0a0a;
    border-color: #7a1a1a;
  }
  .error-box .title,
  .error-box .msg {
    color: #f87171;
  }
  .btn-secondary {
    background: var(--bg);
    color: var(--text-secondary);
    border-color: var(--border-color);
  }
  .btn-secondary:hover {
    background: var(--border-color);
  }
  .btn-simple {
    color: var(--text-muted);
    border-color: var(--border-color);
  }
  .btn-simple:hover {
    background: var(--bg);
  }
  .payment-card-header {
    background: var(--text-primary);
    color: var(--bg);
  }
  .fee-row.highlight {
    background: rgba(247, 147, 26, 0.15);
  }
  .fee-card-header {
    background: var(--bg);
    border-bottom-color: var(--border-color);
  }
  .fee-card-badge {
    background: rgba(247, 147, 26, 0.2);
    color: var(--primary-light);
  }
  .validation-error {
    background: rgba(220, 53, 69, 0.15);
    color: #f87171;
  }
  .validation-error svg {
    stroke: #f87171;
  }
  .mempool-btn {
    background: var(--bg);
    border-color: var(--border-color);
    color: var(--text-secondary);
  }
  .mempool-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
  }
  .mempool-label {
    color: var(--text-muted);
  }
}

/* ===== GENERAL ===== */
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  touch-action: manipulation;
}
.app-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== HEADER ===== */
.site-header {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 12px 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.logo-area {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}
.logo-img {
  width: 145px;
  height: 44px;
  object-fit: contain;
  object-position: left center;
  display: block;
  flex: 0 0 auto;
}
.header-nav {
  display: flex;
  gap: 4px;
  align-items: center;
}
.header-nav a {
  padding: 8px 16px;
  border-radius: var(--radius-xs);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}
.header-nav a:hover {
  background: var(--bg);
  color: var(--text-primary);
}
.header-nav a.active {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: 0 4px 14px rgba(247, 147, 26, 0.35);
}

/* ===== STATUS LIVE ===== */
.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg);
  padding: 5px 14px 5px 10px;
  border-radius: 20px;
  flex-shrink: 0;
  border: 1px solid transparent;
  transition: var(--transition);
}

.status-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  background: #22c55e;
  flex-shrink: 0;
  position: relative;
}

.status-pulse::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: #22c55e;
  opacity: 0.3;
  animation: pulse-ring 2s ease-out infinite;
}

@keyframes pulse-ring {
  0% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  100% {
    transform: scale(1.6);
    opacity: 0;
  }
}

.status-text {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* ===== MAIN CONTAINER ===== */
.container {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  overflow: hidden;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ===== PAGE HEADER ===== */
.page-header-main {
  padding: 28px 32px 20px;
  background: linear-gradient(135deg, #fafbfc 0%, #f4f6f9 100%);
  border-bottom: 1px solid var(--border-color);
}
.header-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}
.page-header-main h1 {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.75px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-header-main .subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 6px;
  line-height: 1.5;
}
.price-update {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  padding: 6px 18px 6px 14px;
  background: var(--card-bg);
  border-radius: 30px;
  border: 1px solid var(--border-color);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}
.price-update .price-icon {
  display: flex;
  align-items: center;
  color: var(--primary);
}
.price-update #priceText {
  color: var(--text-primary);
}
.price-update.fallback #priceText {
  color: #dc3545;
}
.price-update.loading #priceText {
  color: var(--text-muted);
}
.refresh-btn {
  background: none;
  border: none;
  padding: 4px;
  cursor: pointer;
  color: var(--text-muted);
  border-radius: 50%;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.refresh-btn:hover {
  color: var(--text-primary);
  background: var(--bg);
}
.refresh-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.header-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}
.stat-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
}
.stat-label {
  color: var(--text-muted);
  font-weight: 500;
}
.stat-value {
  font-weight: 700;
  color: var(--text-primary);
}
.stat-value.success {
  color: #22c55e;
}

/* ===== CONTENT AREA ===== */
.content-area {
  padding: 20px 24px 12px;
  flex: 1;
  overflow-y: auto;
}

/* ===== PAGES ===== */
.page {
  display: none;
  animation: fadeUp 0.3s ease;
}
.page.active {
  display: block;
}
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== PAGE 1: INPUT ===== */
.input-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border-color);
}
.input-group {
  display: flex;
  gap: 12px;
}
.input-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  transition: var(--transition);
  padding: 0 14px;
  position: relative;
}
.input-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(247, 147, 26, 0.12);
}
.input-wrapper.error {
  border-color: #dc3545;
  box-shadow: 0 0 0 4px rgba(220, 53, 69, 0.12);
}
.input-icon {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  margin-right: 10px;
  flex-shrink: 0;
}
.input-wrapper input {
  flex: 1;
  padding: 14px 0;
  border: none;
  outline: none;
  font-size: 16px;
  font-family: var(--font-mono);
  background: transparent;
  color: var(--text-primary);
  min-height: 52px;
  width: 100%;
}
.input-wrapper input::placeholder {
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 14px;
}
.input-action-btn {
  background: none;
  border: none;
  padding: 4px 0 4px 8px;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  min-width: 32px;
  min-height: 32px;
  border-radius: var(--radius-xs);
}
.input-action-btn:hover {
  color: var(--text-primary);
  background: var(--bg);
}
.input-action-btn.clear {
  color: #dc3545;
}
.input-action-btn.clear:hover {
  background: rgba(220, 53, 69, 0.08);
  color: #dc3545;
}

.input-validation {
  margin-top: 8px;
  min-height: 28px;
}
.validation-error {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(220, 53, 69, 0.08);
  border-radius: var(--radius-xs);
  font-size: 13px;
  font-weight: 500;
  color: #dc3545;
  animation: shake 0.4s ease;
}
.validation-error.show {
  display: flex;
}
.validation-error svg {
  flex-shrink: 0;
  stroke: #dc3545;
}
@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-6px);
  }
  75% {
    transform: translateX(6px);
  }
}

.btn-primary-gradient {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--primary-gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  min-height: 52px;
  box-shadow: 0 4px 16px rgba(247, 147, 26, 0.3);
  touch-action: manipulation;
}
.btn-primary-gradient:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(247, 147, 26, 0.4);
  background: var(--primary-gradient-hover);
}
.btn-primary-gradient:active {
  transform: translateY(0);
}
.btn-primary-gradient:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* ===== MEMPOOL LINKS ===== */
.mempool-links {
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.mempool-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.mempool-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.mempool-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xs);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  touch-action: manipulation;
}

.mempool-btn:hover {
  background: var(--border-color);
  color: var(--text-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.mempool-btn:active {
  transform: scale(0.97);
}

.mempool-btn svg {
  flex-shrink: 0;
}

.feature-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 14px;
  flex-wrap: wrap;
}
.badge {
  padding: 4px 14px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.tutorial-link {
  text-align: center;
  margin-top: 16px;
  padding: 12px;
  background: var(--bg);
  border-radius: var(--radius-xs);
  border: 1px dashed var(--border-color);
}
.tutorial-link a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  font-size: 14px;
}
.tutorial-link a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}
.tutorial-link a svg {
  flex-shrink: 0;
}

/* ===== BACK BUTTON ===== */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xs);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  touch-action: manipulation;
  flex-shrink: 0;
}
.back-btn:hover {
  background: var(--bg);
  border-color: var(--text-muted);
  transform: translateX(-2px);
}
.back-btn:active {
  transform: scale(0.97);
}

/* ===== PAGE 2: DETAILS ===== */
.page-header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0;
  gap: 12px;
  flex-wrap: wrap;
}
.page-header-inner h3 {
  font-size: 18px;
  font-weight: 700;
  flex: 1;
  text-align: center;
}
.network-badge {
  padding: 4px 14px;
  background: var(--bg);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.amount-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 20px 24px;
  text-align: center;
  border: 1px solid var(--border-color);
  margin-bottom: 18px;
}
.amount-main {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}
.btc-amount {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  font-family: var(--font-mono);
}
.status-badge {
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.status-badge.pending {
  background: #fef3c7;
  color: #92400e;
}
.status-badge.confirmed {
  background: #d1fae5;
  color: #065f46;
}
.usd-amount {
  font-size: 16px;
  color: var(--text-secondary);
  margin-top: 4px;
  font-weight: 500;
}

.details-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 20px;
  margin-bottom: 16px;
}
.detail-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-color);
}
.detail-item:nth-last-child(-n + 2) {
  border-bottom: none;
}
.detail-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  min-width: 50px;
}
.detail-value {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  word-break: break-all;
  flex: 1;
}
.detail-value.mono {
  font-family: var(--font-mono);
  font-size: 12px;
}
.detail-copy {
  background: none;
  border: none;
  padding: 2px;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
  flex-shrink: 0;
  display: flex;
  align-items: center;
}
.detail-copy:hover {
  color: var(--text-primary);
}

.notice-pending,
.notice-confirmed {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin: 12px 0 16px;
  font-size: 14px;
}
.notice-pending {
  background: #fef3c7;
  border: 1px solid #fcd34d;
  color: #78350f;
}
.notice-confirmed {
  background: #d1fae5;
  border: 1px solid #6ee7b7;
  color: #065f46;
}
.notice-icon {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.redirect-section {
  margin: 12px 0 16px;
}
.redirect-section label {
  font-size: 14px;
  font-weight: 600;
  display: block;
  margin-bottom: 6px;
  color: var(--text-primary);
}
.input-address-wrapper {
  position: relative;
}
.input-address-wrapper input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: var(--font-mono);
  outline: none;
  background: var(--card-bg);
  transition: var(--transition);
  min-height: 52px;
}
.input-address-wrapper input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(247, 147, 26, 0.1);
}
.input-address-wrapper input.invalid {
  border-color: #dc3545;
  box-shadow: 0 0 0 4px rgba(220, 53, 69, 0.1);
}
.input-address-wrapper input:disabled {
  background: var(--bg);
  cursor: not-allowed;
  opacity: 0.7;
}
.validation-msg {
  display: none;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #dc3545;
  margin-top: 6px;
  font-weight: 500;
}
.validation-msg.show {
  display: flex;
}
.validation-msg svg {
  flex-shrink: 0;
  stroke: #dc3545;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  min-height: 52px;
  touch-action: manipulation;
  text-align: center;
}
.btn-primary-gradient {
  background: var(--primary-gradient);
  color: #fff;
  box-shadow: 0 4px 16px rgba(247, 147, 26, 0.3);
}
.btn-primary-gradient:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(247, 147, 26, 0.4);
  background: var(--primary-gradient-hover);
}
.btn-primary-gradient:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}
.btn-secondary {
  background: var(--bg);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background: var(--border-color);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}
.btn-simple {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}
.btn-simple:hover {
  background: var(--bg);
}
.btn-danger {
  background: #dc3545;
  color: #fff;
  box-shadow: 0 4px 14px rgba(220, 53, 69, 0.3);
}
.btn-danger:hover {
  background: #c82333;
  transform: translateY(-2px);
}
.btn-success {
  background: #22c55e;
  color: #fff;
  box-shadow: 0 4px 14px rgba(34, 197, 94, 0.3);
}
.btn-success:hover {
  background: #16a34a;
  transform: translateY(-2px);
}

/* ===== PAGE 3: FEE ===== */
.fee-content {
  padding: 0;
}

.fee-card {
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
  margin-bottom: 16px;
}

.fee-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
}

.fee-card-title {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-primary);
}

.fee-card-badge {
  padding: 2px 12px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(247, 147, 26, 0.12);
  color: var(--primary);
}

.fee-card-body {
  padding: 14px 16px;
}

.fee-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 14px;
  gap: 12px;
}
.fee-row.highlight {
  background: rgba(247, 147, 26, 0.08);
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  margin: 4px -4px;
}
.fee-label {
  color: var(--text-secondary);
  font-weight: 500;
}
.fee-value {
  font-weight: 700;
  color: var(--text-primary);
}
.fee-value.mono {
  font-family: var(--font-mono);
  font-size: 13px;
}

.payment-card {
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
  margin-bottom: 16px;
}

.payment-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--text-primary);
  color: #fff;
  padding: 12px 16px;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.3px;
}

.payment-card-header svg {
  stroke: #fff;
  flex-shrink: 0;
}

.payment-card-body {
  padding: 12px 16px;
}

.payment-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border-color);
}
.payment-row:last-child {
  border-bottom: none;
}
.payment-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 55px;
  flex-shrink: 0;
}
.payment-value {
  flex: 1;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  word-break: break-all;
}
.payment-value.mono {
  font-family: var(--font-mono);
  font-size: 12px;
}
.copy-btn {
  padding: 4px 14px;
  background: var(--text-muted);
  color: #fff;
  border: none;
  border-radius: var(--radius-xs);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
  min-height: 30px;
}
.copy-btn:hover {
  background: var(--text-secondary);
}
.copy-btn.copied {
  background: #22c55e;
}

/* ===== QR ===== */
.qr-container {
  text-align: center;
  margin: 12px 0 16px;
  display: none;
}
.qr-container.show {
  display: block;
}
.qr-box {
  display: inline-block;
  background: #fff;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}
.qr-box canvas,
.qr-box div {
  width: 170px !important;
  height: 170px !important;
  image-rendering: pixelated;
  max-width: 100%;
}
.qr-loading {
  padding: 30px;
  color: var(--text-muted);
  font-size: 14px;
}
.qr-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

.notice-warning {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  background: #fef3c7;
  border-radius: var(--radius-xs);
  font-size: 13px;
  color: #78350f;
  margin: 12px 0 16px;
}
.notice-warning svg {
  flex-shrink: 0;
  stroke: #78350f;
  margin-top: 1px;
}

/* ===== PAGE 4: PROCESSING ===== */
.processing-content {
  padding: 0;
}

.processing-card {
  text-align: center;
  padding: 32px 20px 24px;
}

.processing-status {
  margin-bottom: 24px;
}

.processing-spinner {
  display: inline-flex;
  color: var(--primary);
  animation: spin 1.8s linear infinite;
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.processing-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 12px;
}

.processing-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.progress-track {
  height: 6px;
  background: var(--bg);
  border-radius: 6px;
  margin: 0 0 24px 0;
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.progress-fill {
  height: 100%;
  background: var(--primary-gradient);
  width: 50%;
  border-radius: 6px;
  animation: slide-progress 1.6s ease-in-out infinite;
}
@keyframes slide-progress {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(250%);
  }
}

.processing-details {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  text-align: left;
  border: 1px solid var(--border-color);
}
.proc-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  font-size: 14px;
  gap: 12px;
}
.proc-label {
  color: var(--text-muted);
  font-weight: 500;
}
.proc-value {
  font-weight: 600;
  color: var(--text-primary);
}
.proc-value.mono {
  font-family: var(--font-mono);
  font-size: 13px;
}

.error-box {
  background: #fef2f2;
  border: 1px solid #fca5a5;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  text-align: center;
  margin: 12px 0;
}
.error-box .title {
  font-weight: 700;
  color: #991b1b;
  font-size: 17px;
}
.error-box .msg {
  font-size: 14px;
  color: #991b1b;
  margin-top: 4px;
}

/* ===== STEP FOOTER ===== */
.step-footer {
  padding: 14px 24px;
  background: var(--bg);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}

/* ===== FOOTER ===== */
.site-footer {
  margin-top: 20px;
  padding: 20px 24px;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-logo-img {
  width: 24px;
  height: 24px;
  border-radius: 4px;
}
.footer-tagline {
  color: var(--text-muted);
  font-weight: 500;
}
.footer-links {
  display: flex;
  gap: 16px;
}
.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--text-primary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .app-wrapper {
    padding: 10px;
  }
  .site-header {
    padding: 10px 16px;
    border-radius: var(--radius-sm);
  }
  .header-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  .logo-area {
    justify-content: flex-start;
  }
  .header-nav {
    justify-content: center;
    flex-wrap: wrap;
    gap: 2px;
  }
  .header-nav a {
    padding: 6px 12px;
    font-size: 13px;
  }
  .header-status {
    align-self: center;
    padding: 4px 12px 4px 8px;
    font-size: 11px;
    gap: 6px;
  }
  .status-pulse {
    width: 6px;
    height: 6px;
  }
  .status-pulse::after {
    inset: -2px;
  }
  .status-text {
    font-size: 10px;
  }
  .page-header-main {
    padding: 20px 16px;
  }
  .page-header-main h1 {
    font-size: 22px;
  }
  .header-stats {
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
  }
  .content-area {
    padding: 14px 14px 8px;
  }
  .input-card {
    padding: 16px;
  }
  .input-group {
    flex-direction: column;
  }
  .btn-primary-gradient {
    justify-content: center;
    min-height: 48px;
    padding: 12px 20px;
  }
  .mempool-links {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    text-align: center;
  }
  .mempool-buttons {
    justify-content: center;
  }
  .mempool-btn {
    padding: 6px 12px;
    font-size: 12px;
  }
  .details-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .detail-item {
    padding: 6px 0;
  }
  .detail-item:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--border-color);
  }
  .detail-item:last-child {
    border-bottom: none;
  }
  .btc-amount {
    font-size: 26px;
  }
  .amount-card {
    padding: 16px;
  }
  .qr-box canvas,
  .qr-box div {
    width: 140px !important;
    height: 140px !important;
  }
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
  .step-footer {
    padding: 10px 16px;
    font-size: 12px;
  }
  .btn {
    min-height: 46px;
    font-size: 15px;
    padding: 12px 16px;
  }
  .page-header-inner {
    padding: 12px 16px 10px;
    gap: 8px;
  }
  .page-header-inner h3 {
    font-size: 16px;
  }
  .back-btn {
    font-size: 12px;
    padding: 4px 10px;
  }
  .input-action-btn {
    min-width: 28px;
    min-height: 28px;
  }
  .input-wrapper input {
    font-size: 15px;
    min-height: 46px;
    padding: 10px 0;
  }
  .fee-card-header,
  .payment-card-header {
    padding: 10px 14px;
    font-size: 13px;
  }
  .fee-card-body,
  .payment-card-body {
    padding: 10px 14px;
  }
  .processing-card {
    padding: 24px 16px 20px;
  }
  .processing-title {
    font-size: 18px;
  }
  .processing-subtitle {
    font-size: 14px;
  }
  .processing-spinner svg {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .page-header-main h1 {
    font-size: 19px;
  }
  .page-header-main .subtitle {
    font-size: 13px;
  }
  .price-update {
    font-size: 12px;
    padding: 4px 12px;
  }
  .btc-amount {
    font-size: 22px;
  }
  .input-wrapper input {
    font-size: 14px;
    min-height: 44px;
    padding: 8px 0;
  }
  .btn-primary-gradient {
    font-size: 14px;
    min-height: 44px;
    padding: 10px 16px;
  }
  .payment-row {
    flex-wrap: wrap;
  }
  .payment-value {
    min-width: 100%;
    order: 2;
  }
  .copy-btn {
    order: 3;
  }
  .qr-box canvas,
  .qr-box div {
    width: 120px !important;
    height: 120px !important;
  }
  .header-nav a {
    font-size: 12px;
    padding: 4px 10px;
  }
  .header-status {
    padding: 3px 10px 3px 6px;
    font-size: 10px;
    gap: 4px;
  }
  .status-pulse {
    width: 5px;
    height: 5px;
  }
  .status-text {
    font-size: 9px;
  }
  .mempool-btn {
    font-size: 11px;
    padding: 4px 10px;
  }
  .mempool-label {
    font-size: 12px;
  }
  .processing-title {
    font-size: 16px;
  }
  .processing-subtitle {
    font-size: 13px;
  }
}

@media (min-width: 1024px) {
  .content-area {
    padding: 28px 32px 16px;
  }
  .details-grid {
    grid-template-columns: 1fr 1fr;
  }
  .detail-item:nth-last-child(-n + 2) {
    border-bottom: none;
  }
  .btn-primary-gradient {
    padding: 14px 36px;
  }
}

/* ===== SCROLLBAR ===== */
.container::-webkit-scrollbar {
  width: 5px;
}
.container::-webkit-scrollbar-track {
  background: transparent;
}
.container::-webkit-scrollbar-thumb {
  background: #d1d5db;
  border-radius: 10px;
}
.container::-webkit-scrollbar-thumb:hover {
  background: #b0b5bd;
}

/* ===== UTILITY ===== */
.mono {
  font-family: var(--font-mono);
}
#hiddenHeader {
  display: none;
}

/* ===== FIX QR CODE RESPONSIVE ===== */
.qr-container {
    text-align: center;
    margin: 12px 0 16px;
    display: none;
}
.qr-container.show {
    display: block;
}
.qr-box {
    display: inline-block;
    background: #fff;
    padding: 12px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    max-width: 100%;
}
.qr-box canvas,
.qr-box div {
    width: 170px !important;
    height: 170px !important;
    image-rendering: pixelated;
    max-width: 100%;
    display: block;
    margin: 0 auto;
}
.qr-loading {
    padding: 30px;
    color: var(--text-muted);
    font-size: 14px;
}
.qr-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

@media (max-width: 768px) {
    .qr-box {
        padding: 10px;
    }
    .qr-box canvas,
    .qr-box div {
        width: 140px !important;
        height: 140px !important;
    }
}

@media (max-width: 480px) {
    .qr-box {
        padding: 8px;
        border-radius: 8px;
    }
    .qr-box canvas,
    .qr-box div {
        width: 110px !important;
        height: 110px !important;
    }
    .qr-hint {
        font-size: 10px;
    }
}

@media (max-width: 360px) {
    .qr-box canvas,
    .qr-box div {
        width: 90px !important;
        height: 90px !important;
    }
}