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

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

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--surface);
  line-height: 1.6;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.3;
  font-weight: var(--font-bold);
  color: var(--text);
}

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

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

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

a:hover {
  color: var(--blue-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* Focus Ring */
*:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background: var(--blue-lighter);
  color: var(--navy);
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* 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); border: 0; }

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

.font-heading { font-family: var(--font-heading); }
.font-body { font-family: var(--font-body); }

.text-navy { color: var(--navy); }
.text-blue { color: var(--blue); }
.text-cyan { color: var(--cyan); }
.text-green { color: var(--green); }
.text-red { color: var(--red); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-white { color: var(--text-inverse); }

.bg-navy { background: var(--navy); }
.bg-blue { background: var(--blue); }
.bg-surface { background: var(--surface); }
.bg-surface-alt { background: var(--surface-alt); }

.fw-regular { font-weight: var(--font-regular); }
.fw-medium { font-weight: var(--font-medium); }
.fw-semibold { font-weight: var(--font-semibold); }
.fw-bold { font-weight: var(--font-bold); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.grid { display: grid; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.relative { position: relative; }
.absolute { position: absolute; }
.sticky { position: sticky; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.m-0 { margin: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(90deg, var(--surface-hover) 25%, var(--border) 50%, var(--surface-hover) 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton-title { width: 60%; height: 32px; margin-bottom: var(--space-4); }
.skeleton-text { width: 100%; height: 16px; margin-bottom: var(--space-3); }
.skeleton-text.short { width: 40%; }
.skeleton-card { width: 100%; height: 200px; margin-bottom: var(--space-4); }
.skeleton-avatar { width: 40px; height: 40px; border-radius: var(--radius-full); }

@keyframes skeleton-pulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.page-loading {
  padding: var(--space-8);
  max-width: 600px;
  margin: 0 auto;
}

/* Fade In Animation */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.3s ease-out forwards;
}

/* Slide Animations */
@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes slideInUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideInLeft {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

.slide-in-right { animation: slideInRight 0.3s ease-out forwards; }
.slide-in-up { animation: slideInUp 0.3s ease-out forwards; }