/* Neo-Brutalist CSS Variables */
:root {
    /* Colors */
    --primary-black: #000000;
    --primary-white: #FFFFFF;
    --accent-red: #FF3333;
    --accent-orange: #FF6600;
    --gray-100: #F8F8F8;
    --gray-200: #F0F0F0;
    --gray-300: #D0D0D0;
    --gray-400: #B0B0B0;
    --gray-500: #666666;
    
    /* Category Colors */
    --color-conference: #FF3333;
    --color-hackathon: #FF6600;
    --color-meetup: #3366FF;
    --color-party: #33FF66;
    --color-coworking: #FF33FF;
    --color-happy-hour: #FFFF33;
    --color-other: #666666;
    
    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-black: 800;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
    
    /* Border Width */
    --border-thin: 2px;
    --border-thick: 4px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--primary-black);
    background-color: var(--gray-100);
    overflow-x: hidden;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.875rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h5 { font-size: clamp(1.125rem, 2vw, 1.25rem); }
h6 { font-size: clamp(1rem, 1.5vw, 1.125rem); }

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--accent-red);
    text-decoration: none;
    transition: all var(--transition-normal);
}

a:hover {
    color: var(--accent-orange);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: var(--border-thick) solid var(--primary-black);
    background-color: var(--primary-white);
    color: var(--primary-black);
    font-family: var(--font-family);
    font-weight: var(--font-weight-bold);
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    border-radius: var(--radius-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn:hover {
    background-color: var(--accent-red);
    color: var(--primary-white);
    border-color: var(--accent-red);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: var(--accent-red);
    color: var(--primary-white);
    border-color: var(--accent-red);
}

.btn-primary:hover {
    background-color: var(--accent-orange);
    border-color: var(--accent-orange);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-black);
    border-color: var(--primary-black);
}

.btn-outline:hover {
    background-color: var(--primary-black);
    color: var(--primary-white);
}

/* Outline buttons on dark backgrounds */
.hero .btn-outline {
    background-color: transparent;
    color: var(--primary-white);
    border-color: var(--primary-white);
    opacity: 0.8;
}

.hero .btn-outline:hover {
    background-color: var(--primary-white);
    color: var(--primary-black);
    opacity: 1;
}

/* Forms */
input, textarea, select {
    width: 100%;
    padding: var(--spacing-sm);
    border: var(--border-thin) solid var(--gray-300);
    background-color: var(--primary-white);
    color: var(--primary-black);
    font-family: var(--font-family);
    font-size: 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent-red);
    box-shadow: 0 0 0 2px rgba(255, 51, 51, 0.2);
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--primary-black);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Form Styles */
.submit-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Event Grid Layout */
.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

/* Featured Events */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

/* Sponsors Tiers */
.sponsors-tiers {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

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

.uppercase {
    text-transform: uppercase;
}

.bold {
    font-weight: var(--font-weight-bold);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes countUp {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

.slide-in {
    animation: slideInFromTop 0.4s ease-out;
}

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

/* Focus Styles */
button:focus-visible,
a:focus-visible {
    outline: 3px solid var(--accent-red);
    outline-offset: 2px;
}

/* Form Validation */
input.error,
textarea.error,
select.error {
    border-color: var(--accent-red);
    background-color: rgba(255, 51, 51, 0.1);
    box-shadow: 0 0 0 2px rgba(255, 51, 51, 0.2);
}

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

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background-color: var(--accent-red);
    color: var(--primary-white);
}

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