/* Base Styles */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    background: var(--gradient-bg);
    color: var(--text-primary);
    font-family: var(--font-primary);
    min-height: 100vh;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overscroll-behavior: none;
}

/* Touch optimizations */
button, .btn, .nav-link, .social-link, .filter-btn {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
    -webkit-user-select: none;
}

/* Improved focus states for accessibility */
button:focus-visible, 
.btn:focus-visible, 
.nav-link:focus-visible,
.social-link:focus-visible,
.filter-btn:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Ensure interactive elements have adequate touch targets */
.btn, .nav-link, .social-link, .filter-btn {
    min-height: 44px;
    min-width: 44px;
}

/* Image optimizations */
img {
    max-width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-select: none;
}

/* Performance optimizations */
.card, .project-card, .skill-category {
    will-change: transform;
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

/* Smooth scrolling for all links */
a[href^="#"] {
    scroll-behavior: smooth;
}

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

/* Section Styling */
section {
    min-height: 100vh;
    padding: var(--spacing-xxl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: var(--fs-h1);
    font-family: var(--font-tech);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.section-subtitle {
    font-size: var(--fs-body);
    color: var(--text-secondary);
    font-weight: 300;
}

/* Glass Morphism */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: var(--border-glass);
    border-radius: var(--radius-lg);
}

/* Card Styling */
.card {
    background: var(--bg-card);
    border: var(--border-glass);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.card:hover::before {
    opacity: 1;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
    border-color: rgba(0, 217, 255, 0.5);
}

/* Button Styling */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--fs-body);
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    border: none;
    text-decoration: none;
    /* Touch optimizations */
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-clip: padding-box;
}

/* Active state for touch devices */
.btn:active {
    transform: translateY(1px);
    transition: transform 0.1s ease;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 217, 255, 0.5);
}

/* Touch devices: use :active instead of :hover for feedback */
@media (hover: none) {
    .btn:hover {
        transform: none;
        box-shadow: var(--shadow-glow);
    }
    
    .btn-primary:active {
        transform: scale(0.98);
        box-shadow: 0 0 20px rgba(0, 217, 255, 0.4);
    }
    
    .card:hover {
        transform: none;
        box-shadow: var(--shadow-card);
    }
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--accent-primary);
    color: var(--accent-primary);
}

.btn-outline:hover {
    background: var(--accent-primary);
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* Loading Screen */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-loading);
    transition: opacity var(--transition-slow);
}

.loading-blur-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    background: rgba(10,10,15,0.25); /* delikatne przyciemnienie */
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.loading-container {
    position: relative;
    z-index: 1;
    background: none;
}

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

.loading-logo {
    margin-bottom: var(--spacing-lg);
}

.logo-text {
    font-family: var(--font-tech);
    font-size: var(--fs-h1);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.loading-progress {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    border-radius: 2px;
    transition: width 0.3s ease;
}

.loading-details {
    margin-top: var(--spacing-md);
}

.loading-status {
    font-family: var(--font-primary);
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    opacity: 0.8;
}

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

.d-flex { display: flex; }
.d-block { display: block; }
.d-none { display: none; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-100 { opacity: 1; }

.stop-scrolling {
  height: 100%;
  overflow: hidden;
}