/* ===== CSS Variables ===== */
:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(255, 255, 255, 0.03);
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.3);
  --success: #10b981;
  --danger: #f87171;
  --radius: 12px;
  --radius-sm: 8px;
}

/* ===== Reset & Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  margin: 2%;
}

/* ===== App Container ===== */
.app-container {
  max-width: 600px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Header ===== */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.logo-icon {
  font-size: 2rem;
}

.logo h1 {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent) 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-card);
  padding: 0.375rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  background: var(--accent);
  color: white;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.tab-icon {
  font-size: 1rem;
}

/* ===== Content ===== */
.content {
  flex: 1;
}

.tab-content {
  display: none;
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Card ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.75rem;
  backdrop-filter: blur(10px);
}

.card h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-description {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* ===== Input Groups ===== */
.input-group {
  margin-bottom: 1rem;
}

.input-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.input-group input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

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

.input-group input::placeholder {
  color: var(--text-muted);
}

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* ===== Buttons ===== */
.primary-btn {
  width: 100%;
  padding: 0.875rem 1.5rem;
  background: linear-gradient(135deg, var(--accent) 0%, #8b5cf6 100%);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 0.5rem;
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--accent-glow);
}

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

.copy-btn {
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1rem;
}

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

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

/* ===== Result Box ===== */
.result {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.result.hidden {
  display: none;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.result-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.625rem;
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
  border-radius: 20px;
}

.result-content {
  display: flex;
  gap: 0.5rem;
}

.result-content input {
  flex: 1;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: 'Monaco', 'Consolas', monospace;
}

.link-info {
  display: flex;
  gap: 1rem;
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.link-info span::before {
  margin-right: 0.25rem;
}

/* ===== Trust Note ===== */
.trust-note {
  margin-top: 1.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

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

/* ===== Responsive ===== */
@media (max-width: 480px) {
  .app-container {
    padding: 1.5rem 1rem;
  }

  .input-row {
    grid-template-columns: 1fr;
  }

  .tab-btn {
    padding: 0.625rem;
    font-size: 0.85rem;
  }

  .tab-icon {
    display: none;
  }
}