/* ============================================
   BASE STYLES - CSS Variables, Resets, Typography
   ============================================ */

:root {
    /* Colors - User's Custom Scheme */
    --primary: #1D9BF0;
    --primary-hover: #1A8CD8;
    --primary-light: rgba(29, 155, 240, 0.1);
    --primary-border: rgba(29, 155, 240, 0.3);
    
    --bg-primary: #000000;
    --bg-secondary: #0A0A0A;
    --bg-tertiary: #16181C;
    --bg-hover: rgba(255, 255, 255, 0.03);
    
    --text-primary: #E7E9EA;
    --text-secondary: #9BA1A6;
    --text-muted: #6B7280;
    
    --border-primary: rgba(47, 51, 54, 0.5);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    --white: #FFFFFF;
    --black: #000000;
    --error: #F4212E;
    --success: #00BA7C;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 24px;
    --radius-full: 999px;
    
    /* Transitions */
    --transition: 0.2s ease;
    
    /* Z-index */
    --z-sticky: 100;
    --z-header: 200;
    --z-dropdown: 300;
    --z-modal: 400;
    --z-toast: 500;
    --z-fab: 150;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    width: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    width: 100%;
    min-width: 100%;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p {
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

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

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

/* ============================================
   SCROLLBAR
   ============================================ */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

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

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

/* ============================================
   UTILITY CLASSES
   ============================================ */

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-error { color: var(--error); }
.text-success { color: var(--success); }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-normal { font-weight: 400; }

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

/* Spacing utilities */
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }

/* Display utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }

/* ============================================
   LOADING STATES
   ============================================ */

.loader-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-primary);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

/* ============================================
   SELECTION
   ============================================ */

::selection {
    background: var(--primary);
    color: var(--white);
}

::-moz-selection {
    background: var(--primary);
    color: var(--white);
}

/* ============================================
   FOCUS STYLES
   ============================================ */

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

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

/* ============================================
   BACKDROP BLUR UTILITIES
   ============================================ */

.backdrop-blur {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.backdrop-blur-sm {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* ============================================
   HIDDEN UTILITIES
   ============================================ */

.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;
}