/* ============================================
   Pi Network DApp — Global Styles
   ============================================ */

:root {
  --pi-purple: #8c52ff;
  --pi-purple-dark: #6b3fd4;
  --pi-gold: #f5a623;
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #222240;
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --border-color: #333355;
  --success: #2ecc71;
  --error: #e74c3c;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* ============================================
   App Container
   ============================================ */

.app-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}

/* ============================================
   Header
   ============================================ */

.app-header {
  text-align: center;
  padding: 32px 0 24px;
}

.logo-section {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.logo-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--pi-purple), var(--pi-gold));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: bold;
  color: #fff;
  flex-shrink: 0;
}

.logo-section h1 {
  font-size: 28px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--pi-purple), var(--pi-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  margin-top: 6px;
  color: var(--text-secondary);
  font-size: 14px;
  letter-spacing: 0.5px;
}

/* ============================================
   Tab Navigation
   ============================================ */

.tab-nav {
  display: flex;
  gap: 4px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 24px;
}

.tab-btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--text-secondary);
  transition: all 0.25s ease;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(140, 82, 255, 0.1);
}

.tab-btn.active {
  background: var(--pi-purple);
  color: #fff;
  box-shadow: 0 2px 12px rgba(140, 82, 255, 0.35);
}

/* ============================================
   Tab Panels
   ============================================ */

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Card
   ============================================ */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.card h2 {
  font-size: 20px;
  margin-bottom: 6px;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 20px;
}

/* ============================================
   Form Elements
   ============================================ */

.payment-form {
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: var(--pi-purple);
  box-shadow: 0 0 0 3px rgba(140, 82, 255, 0.15);
}

/* ============================================
   Scopes Selector
   ============================================ */

.scopes-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.scope-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
}

.scope-item input[type="checkbox"] {
  accent-color: var(--pi-purple);
  width: 16px;
  height: 16px;
}

/* ============================================
   Buttons
   ============================================ */

.action-area {
  margin-top: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--pi-purple), var(--pi-purple-dark));
  color: #fff;
  box-shadow: 0 4px 16px rgba(140, 82, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(140, 82, 255, 0.45);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-icon {
  font-size: 18px;
}

/* ============================================
   Result & Error Boxes
   ============================================ */

.result-box {
  margin-top: 20px;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.result-box h4 {
  font-size: 13px;
  color: var(--success);
  text-transform: uppercase;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.result-box pre {
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 13px;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 300px;
  overflow-y: auto;
}

.error-box {
  margin-top: 16px;
  padding: 12px 16px;
  background: rgba(231, 76, 60, 0.12);
  border: 1px solid rgba(231, 76, 60, 0.3);
  border-radius: 8px;
  color: var(--error);
  font-size: 13px;
}

.user-info-display {
  display: grid;
  gap: 10px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--bg-card);
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.info-row .info-label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-row .info-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-all;
  text-align: right;
  max-width: 60%;
}

/* ============================================
   Hidden Utility
   ============================================ */

.hidden {
  display: none !important;
}

/* ============================================
   Footer
   ============================================ */

.app-footer {
  text-align: center;
  margin-top: 32px;
  padding: 16px;
  color: var(--text-secondary);
  font-size: 12px;
  border-top: 1px solid var(--border-color);
}

.app-footer p {
  margin: 0;
}