:root {
  --navy: #1a2332;
  --navy-light: #2a3442;
  --navy-lighter: #3a4452;
  --gold: #d4a574;
  --gold-hover: #c49564;
  --gold-light: #e4b584;
  --cream: #f8f6f3;
  --white: #ffffff;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-600: #737373;
  --gray-800: #262626;
  --success: #22c55e;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: var(--gray-800);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.container {
  background: var(--white);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 600px;
  overflow: hidden;
}

.header {
  background: var(--navy);
  color: var(--white);
  padding: 2rem;
  text-align: center;
}

.logo {
  font-family: 'Outfit', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 0.95rem;
  color: var(--cream);
  font-weight: 400;
  opacity: 0.9;
}

.tabs {
  display: flex;
  background: var(--gray-100);
  border-bottom: 1px solid var(--gray-200);
}

.tab {
  flex: 1;
  padding: 1rem;
  border: none;
  background: transparent;
  color: var(--gray-600);
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border-bottom: 3px solid transparent;
}

.tab:hover {
  background: var(--gray-200);
  color: var(--navy);
}

.tab.active {
  background: var(--white);
  color: var(--navy);
  border-bottom-color: var(--gold);
}

.main-content {
  padding: 2rem;
}

.system-panel {
  display: none;
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.form-group {
  margin-bottom: 1.5rem;
}

.label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'Outfit', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 0.5rem;
}

.char-counter {
  font-size: 0.75rem;
  color: var(--gray-600);
  font-weight: 500;
}

.input,
.select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-300);
  border-radius: 8px;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  color: var(--navy);
  background: var(--white);
  transition: all 0.2s ease;
}

.input:focus,
.select:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.1);
}

.input::placeholder {
  color: var(--gray-600);
}

.select {
  cursor: pointer;
}

.preview-section {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--gray-200);
}

.preview-box {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--cream);
  border: 2px solid var(--gold-light);
  border-radius: 8px;
}

.preview-text {
  flex: 1;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  color: var(--navy);
  word-break: break-all;
}

.copy-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background: var(--gold);
  color: var(--white);
  border: none;
  border-radius: 6px;
  font-family: 'Outfit', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.copy-btn:hover:not(:disabled) {
  background: var(--gold-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.copy-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.copy-btn.success svg {
  display: none;
}

.copy-btn.success::before {
  content: '✓';
  font-size: 1rem;
}

.footer {
  background: var(--gray-100);
  padding: 1.5rem 2rem;
  text-align: center;
  border-top: 1px solid var(--gray-200);
}

.footer p {
  font-size: 0.875rem;
  color: var(--gray-600);
}

@media (max-width: 640px) {
  .container {
    border-radius: 0;
  }

  .header {
    padding: 1.5rem;
  }

  .logo {
    font-size: 1.75rem;
  }

  .main-content {
    padding: 1.5rem;
  }

  .tab {
    padding: 0.75rem 0.5rem;
    font-size: 0.85rem;
  }

  .preview-box {
    flex-direction: column;
    align-items: stretch;
  }

  .copy-btn {
    width: 100%;
    justify-content: center;
  }
}