/* ============================================================
   Base Styles - Reset, Typography, Theme, Utilities
   5 Minute Mock — Refined Design System
   ============================================================ */

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

/* ========== Document ========== */
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'kern' 1, 'liga' 1;
  color-scheme: var(--color-scheme, light);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg-page);
  min-height: 100vh;
  display: flex;
  transition: background-color var(--transition-theme), color var(--transition-theme);
}

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tighter);
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

p {
  line-height: var(--leading-relaxed);
}

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

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

strong {
  font-weight: var(--font-semibold);
}

small {
  font-size: var(--text-sm);
}

code, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

code {
  background: var(--color-bg-muted);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

pre {
  background: var(--color-bg-inset);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
}

/* ========== Utility Classes ========== */
.hidden {
  display: none !important;
}

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

.text-muted {
  color: var(--color-text-muted);
}

.text-secondary {
  color: var(--color-text-secondary);
}

.text-primary {
  color: var(--color-primary);
}

.text-success {
  color: var(--color-success);
}

.text-warning {
  color: var(--color-warning);
}

.text-danger {
  color: var(--color-danger);
}

/* ========== Main Content Container ========== */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: var(--space-6);
  overflow-y: auto;
  background: var(--color-bg-page);
  min-height: 100vh;
  transition: background-color var(--transition-theme);
}

/* ========== Header ========== */
.header {
  margin-bottom: var(--space-6);
}

.header h1 {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
  margin-bottom: var(--space-1-5);
  letter-spacing: var(--tracking-tighter);
  line-height: var(--leading-tight);
}

.header p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}

/* ========== Grid Layouts ========== */
.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

/* ========== Page System ========== */
.page {
  display: none;
}

.page.active {
  display: block;
  animation: fadeIn var(--transition-slow) ease-out;
}

/* ========== Loading States ========== */
.loading {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.spinner-sm {
  width: 14px;
  height: 14px;
}

.spinner-lg {
  width: 24px;
  height: 24px;
  border-width: 3px;
}

/* ========== Keyframe Animations ========== */
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ========== Accessibility: Reduced Motion ========== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ========== Focus Styles ========== */
:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

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

/* ========== Scrollbar Styling ========== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-muted);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-hover);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-subtle);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border-hover) var(--color-bg-muted);
}

/* ========== Theme Toggle Styles ========== */
.theme-toggle {
  position: relative;
  cursor: pointer;
}

.theme-toggle .theme-icon {
  position: relative;
  width: var(--icon-md);
  height: var(--icon-md);
}

.theme-toggle .theme-icon svg {
  position: absolute;
  top: 0;
  left: 0;
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.theme-toggle .theme-icon svg.hidden {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

.theme-toggle .theme-icon svg:not(.hidden) {
  opacity: 1;
  transform: rotate(0) scale(1);
}

.theme-toggle .theme-label {
  flex: 1;
}

.theme-toggle:hover {
  color: var(--color-primary);
}

.theme-toggle:hover .nav-icon {
  color: var(--color-primary);
}

/* ========== Mobile Menu Toggle ========== */
.menu-toggle {
  display: none;
}

/* ========== Mobile Responsive ========== */
@media (max-width: 768px) {
  /* Constrain body height to enable scrolling within main-content */
  body {
    height: 100vh;
    overflow: hidden;
  }

  .main-content {
    margin-left: 0;
    padding: var(--mobile-padding);
    height: 100vh;
    min-height: auto;
  }

  .grid-2col {
    grid-template-columns: 1fr;
  }

  .header h1 {
    font-size: var(--text-xl);
  }

  .header p {
    font-size: var(--text-base);
  }

  /* Mobile menu toggle - floating action button */
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    bottom: var(--space-5);
    right: var(--space-5);
    width: 56px;
    height: 56px;
    background: var(--color-primary);
    color: var(--color-text-on-primary);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--text-2xl);
    cursor: pointer;
    z-index: var(--z-fixed);
    box-shadow: var(--shadow-primary);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
  }

  .menu-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg), var(--shadow-primary);
  }

  .menu-toggle:active {
    transform: scale(0.95);
  }

  /* Touch-friendly form inputs - prevent iOS zoom */
  input, select, textarea {
    font-size: 16px !important;
    min-height: var(--touch-target-min);
  }

  /* Touch-friendly buttons */
  button, .btn-primary, .btn-secondary, .btn-success, .btn-danger {
    min-height: var(--touch-target-min);
  }
}

@media (min-width: 769px) {
  .menu-toggle {
    display: none;
  }
}

/* ========== Print Styles ========== */
@media print {
  body {
    background: white;
    color: black;
  }

  .sidebar,
  .menu-toggle,
  .theme-toggle {
    display: none !important;
  }

  .main-content {
    margin-left: 0;
    padding: 0;
  }
}