/**
 * SOLVUH Design System - Base Styles
 * ===================================
 * Reset, typography, and base element styles
 */

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    background: var(--surface-950);
    color: var(--surface-100);
    min-height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: var(--line-height-tight);
    color: var(--surface-100);
}

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);
    color: var(--surface-300);
}

a {
    color: var(--primary-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-300);
}

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

code {
    font-size: 0.875em;
    background: var(--surface-800);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    color: var(--primary-400);
}

pre {
    background: var(--surface-900);
    border: 1px solid var(--surface-800);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    overflow-x: auto;
    margin: var(--space-4) 0;
}

pre code {
    background: none;
    padding: 0;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.font-mono { font-family: var(--font-mono); }

/* ========================================
   FOCUS STYLES
   ======================================== */
:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* ========================================
   SELECTION
   ======================================== */
::selection {
    background: var(--primary-500);
    color: white;
}

/* ========================================
   SCROLLBARS
   ======================================== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--surface-700);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--surface-600);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--surface-700) transparent;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.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;
}

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Text colors */
.text-muted { color: var(--surface-500); }
.text-subtle { color: var(--surface-400); }
.text-normal { color: var(--surface-300); }
.text-strong { color: var(--surface-100); }
.text-primary { color: var(--primary-400); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-info { color: var(--info); }

/* Text sizes */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-md { font-size: var(--font-size-md); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

/* Font weights */
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

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

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

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

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

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 5px var(--primary-500); }
    50% { box-shadow: 0 0 20px var(--primary-500); }
}

@keyframes typing {
    0%, 60%, 100% { opacity: 0.3; }
    30% { opacity: 1; }
}

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

@keyframes progressPulse {
    0% { opacity: 1; }
    50% { opacity: 0.6; }
    100% { opacity: 1; }
}

.animate-fade-in { animation: fadeIn var(--transition-base) ease-out; }
.animate-fade-in-up { animation: fadeInUp var(--transition-slow) ease-out; }
.animate-fade-in-down { animation: fadeInDown var(--transition-slow) ease-out; }
.animate-scale-in { animation: scaleIn var(--transition-base) ease-out; }
.animate-slide-in-right { animation: slideInRight var(--transition-slow) ease-out; }
.animate-slide-in-left { animation: slideInLeft var(--transition-slow) ease-out; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-spin { animation: spin 1s linear infinite; }
.animate-bounce { animation: bounce 0.5s ease-out; }
.animate-glow { animation: glow 2s ease-in-out infinite; }

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}