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

:root {
  --airbnb-primary: #FF385C;
  --airbnb-primary-hover: #E53E5C;
  --airbnb-dark: #222222;
  --airbnb-light: #717171;
  --airbnb-bg: #ffffff;
  --airbnb-border: #dddddd;
  --airbnb-radius: 12px;
  --airbnb-shadow: 0 6px 16px rgba(0,0,0,0.12);
}

body {
  font-family: 'Circular', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', sans-serif;
  background: #f7f7f7;
  color: var(--airbnb-dark);
  min-height: 100vh;
  line-height: 1.5;
}

/* Nav */
.airbnb-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.airbnb-nav {
  background: var(--airbnb-bg);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 1px 2px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo svg {
  color: var(--airbnb-primary);
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--airbnb-primary);
}

.lang-switch {
  display: flex;
  gap: 8px;
}

.lang-btn {
  background: transparent;
  border: 1px solid var(--airbnb-border);
  padding: 6px 12px;
  font-size: 14px;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
}

.lang-btn.active, .lang-btn:hover {
  background: var(--airbnb-dark);
  color: #fff;
  border-color: var(--airbnb-dark);
}

/* Main */
.airbnb-main {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 40px 24px;
}

.hero-card {
  width: 100%;
  max-width: 580px;
  text-align: center;
}

.hero-title {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--airbnb-dark);
}

.hero-subtitle {
  font-size: 16px;
  color: var(--airbnb-light);
  margin-bottom: 24px;
}

/* Form Card */
.airbnb-form {
  background: var(--airbnb-bg);
  border-radius: var(--airbnb-radius);
  box-shadow: var(--airbnb-shadow);
  padding: 24px;
}

.form-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.input-group {
  text-align: left;
}

.input-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--airbnb-dark);
}

.input-group input {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  border: 1px solid var(--airbnb-border);
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus {
  border-color: var(--airbnb-dark);
  box-shadow: 0 0 0 2px rgba(34,34,34,0.2);
}

.airbnb-btn {
  background: linear-gradient(135deg, var(--airbnb-primary) 0%, var(--airbnb-primary-hover) 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  margin-top: 8px;
}

.airbnb-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255,56,92,0.3);
}

.airbnb-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

/* Result Card */
.result-card {
  margin-top: 24px;
  background: var(--airbnb-bg);
  border-radius: var(--airbnb-radius);
  box-shadow: var(--airbnb-shadow);
  padding: 24px;
  text-align: left;
}

.result-header {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

#resultMessage {
  font-size: 14px;
  color: var(--airbnb-light);
  margin-bottom: 16px;
}

.logs {
  background: #f7f7f7;
  padding: 16px;
  border-radius: 8px;
  font-size: 13px;
  font-family: 'SFMono-Regular', Consolas, monospace;
  color: var(--airbnb-light);
  max-height: 250px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.airbnb-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--airbnb-primary);
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  margin-top: 16px;
  transition: all 0.2s;
}

.airbnb-btn-secondary:hover {
  background: var(--airbnb-primary-hover);
}

/* Footer */
.airbnb-footer {
  text-align: center;
  padding: 24px;
  color: var(--airbnb-light);
  font-size: 14px;
  border-top: 1px solid var(--airbnb-border);
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f7f7f7; }
::-webkit-scrollbar-thumb { background: #dddddd; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #bbbbbb; }

.donate-box {
  background: linear-gradient(135deg, #fff5f5 0%, #fff 100%);
  border: 1px solid #ffcccc;
  border-radius: 12px;
  padding: 16px;
  margin-top: 16px;
  text-align: center;
}

.donate-tip {
  font-size: 14px;
  color: #FF385C;
  margin-bottom: 12px;
  font-weight: 600;
}

.wallet-row {
  display: flex;
  gap: 8px;
}

.wallet-row input {
  flex: 1;
  padding: 10px 12px;
  font-size: 12px;
  font-family: monospace;
  border: 1px solid #ddd;
  border-radius: 8px;
  background: #fff;
  color: #333;
}

.copy-btn {
  padding: 10px 16px;
  background: #FF385C;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

.copy-btn:hover {
  background: #E53E5C;
}

.donate-chain {
  font-size: 12px;
  color: #999;
  margin-top: 8px;
}