/* Base styles */
:root {
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-100: #f3f4f6;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  --color-green-600: #059669;
  --color-green-700: #047857;
  --color-blue-500: #3b82f6;
  --transition-normal: 0.3s ease-in-out;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--color-white);
  color: var(--color-black);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Dark mode */
body.dark {
  background-color: var(--color-gray-900);
  color: var(--color-white);
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1rem;
  height: 4rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: var(--shadow-sm);
  z-index: 50;
  background-color: var(--color-white);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  position: relative;
}

body.dark .header {
  background-color: var(--color-gray-900);
  border-color: var(--color-gray-700);
}

@media (min-width: 640px) {
  .header {
    padding: 0 1.5rem;
  }
}

/* Logo and navigation */
.logo-container {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo {
  height: 2rem;
  transition: all var(--transition-normal);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
}

@media (max-width: 639px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-white);
    padding: 0.5rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: var(--shadow-sm);
    z-index: 40;
  }
  
  body.dark .nav-links {
    background-color: var(--color-gray-900);
    border-color: var(--color-gray-700);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .nav-link {
    width: 100%;
    text-align: center;
    padding: 0.75rem !important;
    margin: 0.25rem 0;
  }
}

.nav-link {
  padding: 0.25rem 0.75rem;
  border-radius: 0.5rem;
  transition: background-color var(--transition-normal);
  text-decoration: none;
  color: inherit;
}

.nav-link:hover {
  background-color: var(--color-gray-100);
}

body.dark .nav-link:hover {
  background-color: var(--color-gray-800);
}

/* Theme toggle button */
.theme-toggle {
  font-size: 1.25rem;
  padding: 0.5rem;
  border-radius: 0.25rem;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  transition: background-color var(--transition-normal);
}

.theme-toggle:hover {
  background-color: var(--color-gray-100);
}

body.dark .theme-toggle:hover {
  background-color: var(--color-gray-800);
}

/* Mobile menu button */
.mobile-menu-button {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: inherit;
}

@media (max-width: 639px) {
  .mobile-menu-button {
    display: block;
  }
}

.mobile-menu-icon {
  display: block;
  position: relative;
  width: 24px;
  height: 18px;
}

.mobile-menu-icon span,
.mobile-menu-icon::before,
.mobile-menu-icon::after {
  content: '';
  position: absolute;
  height: 2px;
  width: 100%;
  left: 0;
  background-color: currentColor;
  transition: all 0.3s ease;
}

.mobile-menu-icon::before {
  top: 0;
}

.mobile-menu-icon span {
  top: 8px;
}

.mobile-menu-icon::after {
  bottom: 0;
}

.mobile-menu-button.active .mobile-menu-icon::before {
  transform: translateY(8px) rotate(45deg);
}

.mobile-menu-button.active .mobile-menu-icon span {
  opacity: 0;
}

.mobile-menu-button.active .mobile-menu-icon::after {
  transform: translateY(-8px) rotate(-45deg);
}

/* Terminal iframe */
.terminal-frame {
  width: 100%;
  height: calc(100% - 4rem);
  border: none;
  transition: opacity var(--transition-normal);
}

.terminal-frame.fade-out {
  opacity: 0;
}

/* Install prompt */
.install-prompt {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background-color: var(--color-white);
  color: var(--color-black);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  box-shadow: var(--shadow-lg);
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

body.dark .install-prompt {
  background-color: var(--color-gray-800);
  color: var(--color-white);
}

.install-prompt.hidden {
  display: none;
}

.install-btn {
  background-color: var(--color-green-600);
  color: var(--color-white);
  padding: 0.25rem 0.75rem;
  border-radius: 0.25rem;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-normal);
}

.install-btn:hover {
  background-color: var(--color-green-700);
}

.dismiss-install {
  font-size: 0.875rem;
  color: var(--color-gray-500);
  background: none;
  border: none;
  cursor: pointer;
}

.dismiss-install:hover {
  color: var(--color-gray-700);
}

body.dark .dismiss-install:hover {
  color: var(--color-gray-100);
}

/* Spinner overlay */
.spinner-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-white);
  z-index: 40;
}

body.dark .spinner-overlay {
  background-color: var(--color-gray-900);
}

.spinner-overlay.hidden {
  display: none;
}

.spinner {
  height: 2rem;
  width: 2rem;
  border: 4px solid var(--color-blue-500);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Utils */
.hidden {
  display: none;
}