/* Global Styles - Black & White Theme */
:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f5f5f5;
  --color-text: #000000;
  --color-text-secondary: #666666;
  --color-border: #e0e0e0;
  --color-accent: #000000;
  --color-error: #000000;
  --color-success: #000000;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  
  --border-radius: 4px;
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.container-sm {
  max-width: 500px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-text);
  text-decoration: underline;
  transition: opacity var(--transition);
}

a:hover {
  opacity: 0.7;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 2px solid var(--color-accent);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  text-align: center;
}

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

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

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: var(--color-bg);
  color: var(--color-accent);
}

.btn-block {
  width: 100%;
  display: block;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  font-size: 0.875rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  transition: border-color var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-error {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

.form-help {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

/* Checkbox/Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.form-check input {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* Cards */
.card {
  border: 2px solid var(--color-border);
  padding: var(--spacing-xl);
  background: var(--color-bg);
  margin-bottom: var(--spacing-lg);
}

.card-title {
  margin-bottom: var(--spacing-md);
}

.card-body {
  margin-bottom: var(--spacing-md);
}

/* Navigation */
.nav {
  border-bottom: 2px solid var(--color-border);
  padding: var(--spacing-md) 0;
  margin-bottom: var(--spacing-xl);
}

.nav-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 600;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-link {
  text-decoration: none;
  font-weight: 500;
}

/* Alerts */
.alert {
  padding: var(--spacing-md);
  border: 2px solid var(--color-border);
  margin-bottom: var(--spacing-lg);
  white-space: pre-wrap;
  line-height: 1.6;
}

.alert-error {
  border-color: var(--color-error);
  background: var(--color-bg-secondary);
}

.alert-success {
  border-color: var(--color-success);
  background: var(--color-bg-secondary);
}

.alert-info {
  border-color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
}

/* Loading */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-secondary); }
.text-error { color: var(--color-error); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.hidden { display: none; }
.flex { display: flex; }
.flex-column { flex-direction: column; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }

/* Progress Steps */
.progress-steps {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.progress-steps::before {
  content: '';
  position: absolute;
  top: 15px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-border);
  z-index: -1;
}

.progress-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  position: relative;
}

.progress-step-circle {
  width: 30px;
  height: 30px;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.progress-step.active .progress-step-circle {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-bg);
}

.progress-step.completed .progress-step-circle {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-bg);
}

.progress-step-label {
  font-size: 0.75rem;
  text-align: center;
}

/* Lists */
.list-group {
  list-style: none;
  border: 2px solid var(--color-border);
}

.list-item {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.list-item:last-child {
  border-bottom: none;
}

/* Grid */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}