/* ============================================
   Modern Portfolio Stylesheet
   Author: Michał Demczyszak
   Last Updated: 2026-01-29
   ============================================ */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Colors */
  --color-primary: #ffffff;
  --color-secondary: rgba(255, 255, 255, 0.9);
  --color-accent: #007bb5;
  --color-background-overlay: rgba(0, 0, 0, 0.4);
  --color-glass-bg: rgba(255, 255, 255, 0.1);
  --color-glass-border: rgba(255, 255, 255, 0.2);
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-focus: #4a9eff;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 3rem;
  --line-height-base: 1.6;
  --line-height-tight: 1.2;

  /* Sizes */
  --touch-target-min: 60px;
  --border-radius: 12px;
  --border-radius-sm: 8px;

  /* Effects */
  --transition-speed: 0.3s;
  --backdrop-blur: 10px;
  --shadow-sm: 0 2px 4px var(--color-shadow);
  --shadow-md: 0 4px 8px var(--color-shadow);
  --shadow-lg: 0 8px 16px var(--color-shadow);

  /* Text Shadows for better readability */
  --text-shadow-strong: 0 2px 8px rgba(0, 0, 0, 0.8), 0 4px 16px rgba(0, 0, 0, 0.6);
  --text-shadow-medium: 0 2px 6px rgba(0, 0, 0, 0.7), 0 4px 12px rgba(0, 0, 0, 0.5);
  --text-shadow-light: 0 2px 4px rgba(0, 0, 0, 0.6), 0 3px 8px rgba(0, 0, 0, 0.4);
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --color-background-overlay: rgba(0, 0, 0, 0.7);
    --color-glass-bg: rgba(255, 255, 255, 0.2);
  }
}

/* ============================================
   Modern CSS Reset
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

/* ============================================
   Background with Responsive Images
   ============================================ */
body {
  position: relative;
  background-color: #1a1a1a;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
}

/* Mobile - default */
body {
  background-image: url('/images/background-mobile.jpg');
}

/* WebP support for mobile */
.webp body {
  background-image: url('/images/background-mobile.webp');
}

/* Tablet */
@media (min-width: 768px) {
  body {
    background-image: url('/images/background-tablet.jpg');
  }

  .webp body {
    background-image: url('/images/background-tablet.webp');
  }
}

/* Desktop */
@media (min-width: 1024px) {
  body {
    background-image: url('/images/background-desktop.jpg');
  }

  .webp body {
    background-image: url('/images/background-desktop.webp');
  }
}

/* Large screens */
@media (min-width: 1920px) {
  body {
    background-image: url('/images/background-large.jpg');
  }

  .webp body {
    background-image: url('/images/background-large.webp');
  }
}

/* Background overlay for better text contrast */
.background-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    to bottom,
    var(--color-background-overlay) 0%,
    transparent 50%,
    var(--color-background-overlay) 100%
  );
  pointer-events: none;
  z-index: 1;
}

/* ============================================
   Main Layout
   ============================================ */
main {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  gap: var(--spacing-lg);
}

/* ============================================
   Header and Profile Section
   ============================================ */
.site-header {
  text-align: center;
  animation: fadeInUp 0.8s ease-out;
}

.profile-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.profile-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  border: 4px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  object-fit: cover;
}

.name {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: var(--line-height-tight);
  text-shadow: var(--text-shadow-strong);
  letter-spacing: -0.02em;
}

.tagline {
  font-size: var(--font-size-xl);
  font-weight: 300;
  color: var(--color-secondary);
  text-shadow: var(--text-shadow-medium);
}

/* ============================================
   Social Navigation
   ============================================ */
.social-nav {
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.social-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  padding: 0;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-glass-bg);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border: 1px solid var(--color-glass-border);
  border-radius: var(--border-radius);
  color: var(--color-primary);
  text-decoration: none;
  transition: all var(--transition-speed) ease;
  box-shadow: var(--shadow-md);
}

.social-link:hover,
.social-link:focus {
  transform: translateY(-4px) scale(1.05);
  background: var(--color-glass-border);
  box-shadow: var(--shadow-lg);
}

.social-link:focus {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.social-link:active {
  transform: translateY(-2px) scale(1.02);
}

.social-icon {
  width: 38px;
  height: 38px;
  filter: brightness(0) invert(1);
  transition: filter var(--transition-speed) ease;
}

.social-link:hover .social-icon {
  filter: brightness(0) invert(1) drop-shadow(0 0 8px rgba(255, 255, 255, 0.8));
}

/* Screen reader only text */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  text-align: center;
  font-size: var(--font-size-base);
  color: var(--color-secondary);
  text-shadow: var(--text-shadow-light);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

.site-footer p {
  margin: 0;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

  .social-link:hover,
  .social-link:focus {
    transform: none;
  }
}

/* ============================================
   Responsive Design - Mobile First
   ============================================ */

/* Small phones */
@media (max-width: 374px) {
  .name {
    font-size: var(--font-size-2xl);
  }

  .tagline {
    font-size: var(--font-size-lg);
  }

  .social-links {
    gap: var(--spacing-sm);
  }
}

/* Tablets and up */
@media (min-width: 768px) {
  main {
    padding: var(--spacing-xl);
    gap: var(--spacing-xl);
  }

  .profile-image {
    width: 180px;
    height: 180px;
  }

  .social-links {
    gap: var(--spacing-lg);
  }
}

/* Desktop and up */
@media (min-width: 1024px) {
  .name {
    font-size: 4rem;
  }

  .tagline {
    font-size: 2rem;
  }

  .profile-image {
    width: 200px;
    height: 200px;
  }
}

/* Large screens */
@media (min-width: 1920px) {
  main {
    gap: 4rem;
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  body {
    background: white;
    color: black;
  }

  .background-overlay {
    display: none;
  }

  .social-link {
    background: white;
    border: 1px solid black;
    color: black;
  }

  .social-icon {
    filter: none;
  }
}