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

:root {
  --color-primary: #667eea;
  --color-secondary: #764ba2;
  --color-bg-light: #f8f9fa;
  --color-bg-dark: #f0f0f5;
  --color-text-dark: #333;
  --color-text-light: #666;
  --color-border: #e9ecef;
  --color-error: #e74c3c;
  --color-success: #27ae60;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0;
  margin: 0;
}

.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Navigation */
nav {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  flex-wrap: wrap;
}

nav a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 0.3s, border-bottom 0.3s;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
}

nav a:hover {
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
}

nav a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Main Content */
main {
  flex: 1;
  padding: 3rem 2rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  background: white;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  padding: 3rem 2rem;
}

/* Typography */
h1 {
  color: var(--color-text-dark);
  margin-bottom: 1rem;
  font-size: 2.5rem;
}

h2 {
  color: var(--color-text-dark);
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  margin-top: 2rem;
}

.subtitle {
  color: var(--color-text-light);
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

.description {
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 1rem;
}

/* Category Cards Grid */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.category-card {
  background: var(--color-bg-light);
  border-radius: 15px;
  padding: 2rem;
  border: 2px solid var(--color-border);
  text-decoration: none;
  color: inherit;
  transition: transform 0.3s, box-shadow 0.3s, background-color 0.3s;
  display: flex;
  flex-direction: column;
}

.category-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
  background-color: var(--color-bg-dark);
}

.category-card:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.category-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.category-title {
  color: var(--color-primary);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.category-description {
  color: var(--color-text-light);
  font-size: 0.95rem;
  flex: 1;
  line-height: 1.5;
}

/* Items Grid */
.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.item-card {
  background: var(--color-bg-light);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  text-decoration: none;
  color: inherit;
  transition: transform 0.3s, box-shadow 0.3s;
  display: flex;
  flex-direction: column;
}

.item-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.item-card:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.item-title {
  color: var(--color-primary);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.item-description {
  color: var(--color-text-light);
  font-size: 0.95rem;
  flex: 1;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.item-link {
  color: var(--color-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  align-self: flex-start;
  transition: color 0.3s;
}

.item-link:hover {
  color: var(--color-primary);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
  background: var(--color-bg-light);
  border-radius: 12px;
  border: 2px dashed var(--color-border);
  color: var(--color-text-light);
}

.empty-state-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.empty-state-message {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

/* Widgets (for homepage features) */
.widgets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.widget {
  background: var(--color-bg-light);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s;
}

.widget:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.widget-title {
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  letter-spacing: 0.5px;
}

.widget-value {
  font-size: 1.8rem;
  color: var(--color-text-dark);
  font-weight: bold;
  margin-bottom: 0.5rem;
}

.widget-description {
  color: var(--color-text-light);
  font-size: 0.85rem;
}

.widget-emoji {
  font-size: 2.5rem;
  margin: 0.75rem 0;
}

/* Celestial Panel Styles */
.celestial-section {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--color-bg-light);
  border-radius: 15px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.celestial-title {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
  text-align: center;
}

.celestial-info-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  margin: 0.4rem 0;
}

.celestial-label {
  font-weight: 600;
  color: var(--color-text-dark);
}

.celestial-value {
  color: var(--color-text-dark);
  font-weight: 500;
}

.celestial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

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

.celestial-object {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  text-align: center;
}

.celestial-name {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.celestial-label {
  font-size: 0.95rem;
}

.celestial-value {
  font-size: 0.95rem;
}

.celestial-object:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}

.celestial-info-row {
  display: flex;
  justify-content: space-between;
  margin: 0.4rem 0;
  font-size: 0.95rem;
}

.celestial-label {
  font-weight: 600;
  color: var(--color-text-dark);
}

.celestial-value {
  color: var(--color-text-dark);
  font-weight: 500;
}

.loading {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.error {
  color: var(--color-error);
  font-size: 0.9rem;
}

/* Buttons */
button {
  padding: 0.75rem 1.5rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s, transform 0.2s;
}

button:hover {
  background: var(--color-secondary);
  transform: translateY(-2px);
}

button:active {
  transform: translateY(0);
}

button:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Textarea */
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  resize: vertical;
  min-height: 100px;
  transition: border-color 0.3s;
}

textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Select */
select {
  padding: 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.95rem;
  cursor: pointer;
  background: white;
  transition: border-color 0.3s;
}

select:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Status Messages */
.status-message {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
  display: none;
}

.status-message.show {
  display: block;
}

.status-message.loading {
  background: #e8f4f8;
  color: var(--color-primary);
}

.status-message.success {
  background: #e8f5e9;
  color: var(--color-success);
}

.status-message.error {
  background: #ffebee;
  color: var(--color-error);
}

/* Responsive Design */
@media (max-width: 768px) {
  nav ul {
    gap: 1rem;
    flex-direction: column;
  }

  nav a {
    font-size: 0.9rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .container {
    border-radius: 12px;
    padding: 1.5rem 1rem;
  }

  main {
    padding: 1.5rem 1rem;
  }

  .categories-grid,
  .items-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .widgets {
    grid-template-columns: 1fr;
  }

  .widget-emoji {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  nav {
    padding: 0.75rem 1rem;
  }

  nav ul {
    gap: 0.5rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  .container {
    padding: 1rem;
  }

  main {
    padding: 1rem;
  }

  .category-icon {
    font-size: 2.5rem;
  }

  button {
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 2rem;
}

.mb-2 {
  margin-bottom: 2rem;
}

.mt-3 {
  margin-top: 3rem;
}

.hidden {
  display: none !important;
}

/* Accessibility */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 100;
}

.skip-to-main:focus {
  top: 0;
}