/* Base styles and CSS variables for ZamHack Platform - DevPost Inspired */

:root {
    /* Primary Color Palette - DevPost Inspired */
    --primary: #003E54;        /* Deep teal/blue */
    --primary-light: #0A5F7C;
    --primary-dark: #00293A;
    --secondary: #3770FF;      /* Bright blue */
    --secondary-light: #5B8BFF;
    --secondary-dark: #2556D9;
    --accent: #FF6B6B;         /* Coral red for highlights */
    --accent-light: #FF8E8E;
    
    /* Supporting Colors */
    --success: #00C48C;
    --warning: #FFA94D;
    --danger: #FF6B6B;
    --info: #3770FF;
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --gray-50: #F7F9FA;
    --gray-100: #EFF2F5;
    --gray-200: #E4E9EE;
    --gray-300: #D1D9E0;
    --gray-400: #B0BEC5;
    --gray-500: #8B99A6;
    --gray-600: #677684;
    --gray-700: #495763;
    --gray-800: #2E3A45;
    --gray-900: #1A2229;
    --black: #0F1419;
    
    /* Text Colors */
    --text-primary: #1A2229;
    --text-secondary: #495763;
    --text-muted: #8B99A6;
    --text-inverse: #FFFFFF;
    
    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F7F9FA;
    --bg-tertiary: #EFF2F5;
    --bg-dark: #1A2229;
    
    /* Transparency */
    --primary-alpha-10: rgba(0, 62, 84, 0.1);
    --primary-alpha-20: rgba(0, 62, 84, 0.2);
    --primary-alpha-80: rgba(0, 62, 84, 0.8);
    --secondary-alpha-10: rgba(55, 112, 255, 0.1);
    --secondary-alpha-20: rgba(55, 112, 255, 0.2);
    --secondary-alpha-80: rgba(55, 112, 255, 0.8);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
    
    /* Font Weights */
    --font-light: 300;
    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;
    
    /* Spacing */
    --spacing-xs: 0.25rem;     /* 4px */
    --spacing-sm: 0.5rem;      /* 8px */
    --spacing-md: 1rem;        /* 16px */
    --spacing-lg: 1.5rem;      /* 24px */
    --spacing-xl: 2rem;        /* 32px */
    --spacing-xxl: 3rem;       /* 48px */
    --spacing-xxxl: 4rem;      /* 64px */
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
    
    /* Z-index layers */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Reset and base styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: var(--font-regular);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: var(--font-bold);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { 
    font-size: 3rem; 
    font-weight: var(--font-extrabold);
}

h2 { 
    font-size: 2.25rem; 
    font-weight: var(--font-bold);
}

h3 { 
    font-size: 1.875rem; 
    font-weight: var(--font-bold);
}

h4 { 
    font-size: 1.5rem; 
    font-weight: var(--font-semibold);
}

h5 { 
    font-size: 1.25rem; 
    font-weight: var(--font-semibold);
}

h6 { 
    font-size: 1rem; 
    font-weight: var(--font-semibold);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

/* Links */
a {
    color: var(--secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

a:focus-visible {
    outline: 2px solid var(--secondary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Container and layout */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    width: 100%;
}

.container-narrow {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-xl);
}

/* Grid system */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

.grid-auto {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Flexbox utilities */
.flex {
    display: flex;
}

.flex-column {
    flex-direction: column;
}

.flex-center {
    align-items: center;
    justify-content: center;
}

.flex-between {
    justify-content: space-between;
}

.flex-wrap {
    flex-wrap: wrap;
}

.flex-grow {
    flex-grow: 1;
}

.align-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

/* Spacing utilities */
.mt-0 { margin-top: 0; }
.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); }
.mt-5 { margin-top: var(--spacing-xl); }
.mt-6 { margin-top: var(--spacing-xxl); }

.mb-0 { margin-bottom: 0; }
.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); }
.mb-5 { margin-bottom: var(--spacing-xl); }
.mb-6 { margin-bottom: var(--spacing-xxl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }
.p-5 { padding: var(--spacing-xl); }
.p-6 { padding: var(--spacing-xxl); }

.py-0 { padding-top: 0; padding-bottom: 0; }
.py-1 { padding-top: var(--spacing-xs); padding-bottom: var(--spacing-xs); }
.py-2 { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-3 { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-4 { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }
.py-5 { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }

.px-0 { padding-left: 0; padding-right: 0; }
.px-1 { padding-left: var(--spacing-xs); padding-right: var(--spacing-xs); }
.px-2 { padding-left: var(--spacing-sm); padding-right: var(--spacing-sm); }
.px-3 { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
.px-4 { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }
.px-5 { padding-left: var(--spacing-xl); padding-right: var(--spacing-xl); }

/* Text utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-white { color: var(--white); }
.text-accent { color: var(--accent); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }

.font-light { font-weight: var(--font-light); }
.font-normal { font-weight: var(--font-regular); }
.font-medium { font-weight: var(--font-medium); }
.font-semibold { font-weight: var(--font-semibold); }
.font-bold { font-weight: var(--font-bold); }
.font-extrabold { font-weight: var(--font-extrabold); }

.text-uppercase { text-transform: uppercase; }
.text-lowercase { text-transform: lowercase; }
.text-capitalize { text-transform: capitalize; }

.text-gradient {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Display utilities */
.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

/* Position utilities */
.position-relative { position: relative; }
.position-absolute { position: absolute; }
.position-fixed { position: fixed; }
.position-sticky { position: sticky; }

/* Border utilities */
.border-none { border: none; }
.border { border: 1px solid var(--gray-200); }
.border-primary { border: 1px solid var(--primary); }
.border-secondary { border: 1px solid var(--secondary); }
.border-radius { border-radius: var(--radius-md); }
.border-radius-lg { border-radius: var(--radius-lg); }
.border-radius-full { border-radius: var(--radius-full); }

/* Background utilities */
.bg-primary { background-color: var(--bg-primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-tertiary { background-color: var(--bg-tertiary); }
.bg-dark { background-color: var(--bg-dark); }
.bg-white { background-color: var(--white); }
.bg-transparent { background: transparent; }

/* Overflow utilities */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-x-auto { overflow-x: auto; }
.overflow-y-auto { overflow-y: auto; }

/* Animation utilities */
.fade-in {
    animation: fadeIn var(--transition-slow) ease-out;
}

.slide-up {
    animation: slideUp var(--transition-slow) ease-out;
}

.slide-down {
    animation: slideDown var(--transition-slow) ease-out;
}

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

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--gray-200);
    border-radius: 50%;
    border-top-color: var(--secondary);
    animation: spin 0.8s linear infinite;
}

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

/* Focus states for accessibility */
*:focus-visible {
    outline: 2px solid var(--secondary);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--secondary);
    outline-offset: 2px;
}

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

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* Selection styling */
::selection {
    background-color: var(--secondary-alpha-20);
    color: var(--text-primary);
}

/* Responsive utilities */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.75rem; }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .d-md-none { display: none; }
    .d-md-block { display: block; }
    .d-md-flex { display: flex; }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}