/**
 * Base styles, reset, and global utilities
 */

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--space-4);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Loading Screen */
.app-loading {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-4);
}

.loading-content h2 {
  margin: 0;
  color: var(--text-primary);
}

.loading-content p {
  margin: 0;
  color: var(--text-secondary);
}

/* Error Screen */
.app-error {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  z-index: 9999;
}

.error-content {
  max-width: 600px;
  text-align: center;
}

/* Navbar */
.navbar {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  height: var(--navbar-height);
}

.navbar-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.navbar-logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  font-family: var(--font-display);
  font-style: italic;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-logo:hover {
  text-decoration: none;
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  flex-direction: column;
  gap: 4px;
}

.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition-base);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.navbar-links {
  display: flex;
  gap: var(--space-2);
}

.navbar-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
  transition: var(--transition-fast);
  text-decoration: none;
}

.navbar-link:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-link.active {
  color: var(--text-primary);
  background-color: transparent;
  position: relative;
}

.navbar-link.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: var(--space-4);
  right: var(--space-4);
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

.navbar-actions {
  display: flex;
  gap: var(--space-2);
}

/* Main Content */
.main-content {
  flex: 1;
  min-height: calc(100vh - var(--navbar-height) - var(--footer-height));
  padding: var(--space-6) 0;
}

.view-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Loading State */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  gap: var(--space-4);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Floating Action Button */
.fab {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  color: var(--text-inverse);
  border: none;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  transition: var(--transition-base);
  z-index: var(--z-fixed);
}

.fab:hover {
  background-color: var(--color-primary-hover);
  transform: scale(1.1);
}

.fab:active {
  transform: scale(0.93);
  transition: transform var(--anim-micro);
}

/* Home button: mirrors the add FAB on the left, quieter so "+" stays primary */
.fab-home {
  right: auto;
  left: var(--space-8);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.fab-home:hover {
  background-color: var(--bg-hover);
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-6) 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.footer-content {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.footer-meta {
  margin-top: var(--space-2);
  color: var(--text-tertiary);
}

/* Utility Classes */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.hidden { display: none !important; }
.visible { display: block !important; }

/* Responsive - Mobile */
@media (max-width: 768px) {
  .navbar-toggle {
    display: flex;
  }
  
  .navbar-menu {
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-4);
    display: none;
  }
  
  .navbar-menu.active {
    display: flex;
  }
  
  .navbar-links {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .navbar-link {
    justify-content: flex-start;
  }
  
  .navbar-actions {
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-color);
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .fab {
    bottom: var(--space-6);
    right: var(--space-6);
  }

  .fab-home {
    right: auto;
    left: var(--space-6);
  }
  
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus Styles */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

/* Selection */
::selection {
  background-color: var(--color-primary);
  color: var(--text-inverse);
}