/* Base Styles - Global resets, typography, common elements, and animations */

/* ===== CSS VARIABLES ===== */
:root {
    /* Colors */
    --primary-color: #667eea;
    --primary-hover: #5a6fd8;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --secondary-color: #6c757d;
    
    /* Advanced Tracker Colors */
    --tracker-primary: #364d63;
    --tracker-success: #27ae60;
    --tracker-danger: #e74c3c;
    --tracker-warning: #f39c12;
    --tracker-info: #3498db;
    --tracker-light: #ecf0f1;
    
    /* Background Gradients */
    --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* Sidebar */
    --sidebar-width: 230px;
    --sidebar-collapsed-width: 50px;
    --sidebar-bg: var(--primary-gradient);
    --sidebar-text: #ffffff;
    --sidebar-hover: rgba(255, 255, 255, 0.1);
    --sidebar-active: rgba(255, 255, 255, 0.2);
    --transition-speed: 0.3s;
    
    /* Fonts */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ===== CSS RESET AND BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background: var(--bg-gradient);
    color: #1e293b;
    line-height: 1.6;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5rem;
    font-weight: 600;
    line-height: 1.2;
    color: #1e293b;
    letter-spacing: -0.025em;
}

h1 { 
    font-size: 2.5rem; 
    font-weight: 700;
}
h2 { font-size: 2rem; font-weight: 600; }
h3 { font-size: 1.5rem; font-weight: 600; }
h4 { font-size: 1.25rem; font-weight: 600; }
h5 { font-size: 1.1rem; font-weight: 600; }
h6 { font-size: 1rem; font-weight: 600; }

p {
    margin-bottom: 1rem;
}

/* ===== LINKS ===== */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ===== LISTS ===== */
ul, ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

/* ===== IMAGES ===== */
img {
    max-width: 100%;
    height: auto;
}

/* ===== FOCUS STATES ===== */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* ===== ACCESSIBILITY ===== */
.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;
}

/* ===== DISPLAY UTILITIES ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-grid { display: grid !important; }

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

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

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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