*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary-color: #0f172a;
  --primary-light: #1e293b;
  --accent-color: #3b82f6;
  --accent-glow: #60a5fa;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --background-color: #020617;
  --surface-color: #0f172a;
  --border-color: #1e293b;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --success-color: #22c55e;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--background-color);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 1rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.header-logo {
  font-size: 1.125rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-color), var(--accent-glow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.05em;
}

.header-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 0.5rem;
  font-weight: 400;
}

/* Status badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-pending {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-glow);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-ready {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success-color);
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.badge-expired {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger-color);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-executed {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success-color);
  border: 1px solid rgba(34, 197, 94, 0.3);
}

/* Cards */
.card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

/* Amount display */
.amount-display {
  text-align: center;
  padding: 1.5rem 0;
}

.amount-value {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
}

.amount-asset {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 0.25rem;
}

/* Detail rows */
.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 0.625rem 0;
  border-bottom: 1px solid rgba(30, 41, 59, 0.5);
  gap: 0.5rem;
}

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

.detail-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.detail-value {
  font-size: 0.8125rem;
  text-align: right;
  word-break: break-all;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

/* Copy button */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.125rem 0.375rem;
  border-radius: 0.375rem;
  font-size: 0.6875rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
  margin-left: 0.25rem;
  flex-shrink: 0;
}

.copy-btn:hover {
  border-color: var(--accent-color);
  color: var(--accent-glow);
}

.copy-btn.copied {
  border-color: var(--success-color);
  color: var(--success-color);
}

/* Signature progress */
.sig-progress {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.sig-bar {
  flex: 1;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.sig-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-color), var(--accent-glow));
  border-radius: 3px;
  transition: width 0.3s ease;
}

.sig-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* Expiry countdown */
.expiry {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.expiry.expiry-urgent {
  color: var(--warning-color);
}

.expiry.expiry-expired {
  color: var(--danger-color);
}

/* Checklist */
.checklist {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.check-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 0.125rem;
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
}

.check-item input[type="checkbox"]:checked {
  background: var(--accent-color);
  border-color: var(--accent-color);
}

.check-item input[type="checkbox"]:checked::after {
  content: '\2713';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
}

.check-label {
  font-size: 0.875rem;
  line-height: 1.4;
}

/* Buttons */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.875rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-sans);
  -webkit-tap-highlight-color: transparent;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-color), #2563eb);
  color: white;
}

.btn-primary:not(:disabled):hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

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

.btn-connect {
  background: var(--primary-light);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-connect:not(:disabled):hover {
  border-color: var(--accent-color);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger-color);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Wallet info */
.wallet-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
}

.wallet-address {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.8125rem;
  color: var(--accent-glow);
}

.wallet-disconnect {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  font-family: var(--font-sans);
}

.wallet-disconnect:hover {
  color: var(--danger-color);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: 1.5rem;
  width: 100%;
  max-width: 480px;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.modal-body {
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
}

.modal-actions .btn {
  flex: 1;
}

/* State screens */
.state-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  gap: 1rem;
}

.state-icon {
  font-size: 3rem;
  line-height: 1;
}

.state-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.state-message {
  font-size: 0.875rem;
  color: var(--text-muted);
  max-width: 300px;
}

/* Loading skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--primary-light) 25%, var(--border-color) 50%, var(--primary-light) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 0.375rem;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-line {
  height: 1rem;
  margin-bottom: 0.5rem;
}

.skeleton-line.short {
  width: 60%;
}

.skeleton-line.medium {
  width: 80%;
}

/* Success animation */
.success-check {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(34, 197, 94, 0.15);
  border: 2px solid var(--success-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
  from { transform: scale(0); }
  to { transform: scale(1); }
}

/* Warning banner */
.banner {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  margin-bottom: 1rem;
}

.banner-warning {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--warning-color);
}

.banner-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--danger-color);
}

/* Footer spacer for thumb zone */
.footer-spacer {
  height: 2rem;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .container {
    padding: 2rem;
  }

  .modal {
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
  }

  .modal-overlay {
    align-items: center;
  }

  .amount-value {
    font-size: 3rem;
  }
}