html, body {
  height: 100%;
}

body {
  margin: 0;
  background: #000;
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", "Helvetica Neue", sans-serif;
  display: grid;
  place-items: center;
}

:where(*, *::before, *::after) {
  box-sizing: border-box;
}

:root {
  --space-1: clamp(8px, 1.8vw, 12px);
  --space-2: clamp(12px, 2.4vw, 16px);
  --space-3: clamp(16px, 3vw, 20px);
  --radius: clamp(10px, 2vw, 14px);
  --container-pad: clamp(20px, 4vw, 28px);
  --gap: clamp(12px, 3vw, 18px);
  --avatar-size: clamp(72px, 18vw, 104px);
  --name-font: clamp(24px, 5vw, 32px);
  --btn-font: clamp(16px, 2.5vw, 18px);
  --btn-pad-y: clamp(12px, 2.4vw, 18px);
  --btn-pad-x: clamp(14px, 2.8vw, 18px);
  --btn-min-h: clamp(44px, 10vw, 56px);
}

main.container {
  width: min(92vw, 560px);
  padding: var(--container-pad);
  border-radius: var(--radius);
  border: 4px solid #333;
  box-shadow: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap);
  background: #000;
  position: relative;
  z-index: 10;
  transition: border-color 0.5s ease, box-shadow 0.5s ease;
}

.avatar {
  width: var(--avatar-size);
  height: var(--avatar-size);
  border-radius: 50%;
  border: 4px solid #333;
  display: grid;
  place-items: center;
  background: rgba(255,255,255,0.05);
  color: #fff;
  box-shadow: none;
  transition: border-color 0.5s ease, box-shadow 0.5s ease;
}

.avatar span {
  font-size: clamp(24px, 5vw, 32px);
  text-shadow: 0 0 6px #fff, 0 0 12px rgba(255,255,255,0.8), 0 0 24px rgba(255,255,255,0.6);
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}

.name {
  margin: 0;
  font-size: var(--name-font);
  letter-spacing: 0.5px;
  text-shadow: 0 0 6px #fff, 0 0 12px rgba(255,255,255,0.8), 0 0 24px rgba(255,255,255,0.6);
}

.bio {
  margin: 0 0 10px;
  text-align: center;
  color: #d9d9d9;
  text-shadow: 0 0 4px rgba(255,255,255,0.6);
}

.links {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.btn {
  display: flex;
  width: 100%;
  padding: var(--btn-pad-y) var(--btn-pad-x);
  min-height: var(--btn-min-h);
  border-radius: var(--radius);
  text-align: center;
  text-decoration: none;
  color: #fff;
  border: 4px solid #333;
  background: rgba(255,255,255,0.05);
  box-shadow: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color 0.5s ease;
  font-size: var(--btn-font);
  line-height: 1.15;
  align-items: center;
  justify-content: center;
  gap: clamp(6px, 1.6vw, 10px);
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px) scale(1.02);
  background: rgba(255,255,255,0.09);
}

.btn.neon-active:hover {
  box-shadow: 0 0 18px rgba(255,255,255,0.7), inset 0 0 12px rgba(255,255,255,0.35);
}

.btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
  box-shadow: 0 0 20px rgba(255,255,255,0.8), inset 0 0 14px rgba(255,255,255,0.4);
}

.btn .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
  flex: 0 0 auto;
  filter: drop-shadow(0 0 4px rgba(255,255,255,0.6));
}

.btn .icon svg {
  width: 100%;
  height: 100%;
  fill: #fff;
  display: block;
}

.btn .icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.btn .label {
  display: inline-block;
  line-height: 1.1;
}

@keyframes neonPulse {
  from {
    box-shadow: 0 0 8px rgba(255,255,255,0.35), inset 0 0 6px rgba(255,255,255,0.18);
  }
  to {
    box-shadow: 0 0 18px rgba(255,255,255,0.7), inset 0 0 12px rgba(255,255,255,0.35);
  }
}

@keyframes containerGlow {
  from {
    box-shadow: 0 0 12px rgba(255,255,255,0.35), inset 0 0 8px rgba(255,255,255,0.2);
  }
  to {
    box-shadow: 0 0 26px rgba(255,255,255,0.8), inset 0 0 16px rgba(255,255,255,0.35);
  }
}

.layout-wrapper {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.logo-animation {
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-weight: 800;
  font-size: clamp(32px, 6vw, 64px);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* SVG Letter Styles */
.letter-svg {
  width: 0.8em;
  height: 1.2em;
  overflow: visible;
  /* Make sure SVGs don't collapse */
  display: inline-block;
}

.neon-text {
  font-family: inherit;
  font-weight: 800;
  fill: transparent;
  stroke: #ffffff; /* White Outline */
  stroke-width: 2px;
  stroke-dasharray: 100 100;
  stroke-dashoffset: 0;
  opacity: 0; /* Initially invisible */
  /* Remove paint-order if it interferes, but standard stroke is centered on path */
}

/* Active State */
.neon-text.active {
  opacity: 1;
  animation: dash 2s linear infinite; /* Rotating gap */
  transition: fill-opacity 2s ease-in-out;
  fill: url(#neon-gradient); /* Animated Gradient Fill */
  fill-opacity: 0.6; /* Semi-Transparent initially */
  
  /* Add glow via drop-shadow on the SVG element or text-shadow analog */
  /* text-shadow doesn't work on SVG text usually, use filter drop-shadow */
  /* White glow for stroke + Blue glow for fill */
  filter: drop-shadow(0 0 2px #ffffff) drop-shadow(0 0 5px #4da6ff);
}

/* Filled State (after 2s) */
.neon-text.filled {
  stroke-dasharray: 0; /* Full stroke */
  stroke-dashoffset: 0;
  animation: none; /* Stop rotation */
  fill: url(#neon-gradient); /* Keep Gradient */
  fill-opacity: 1; /* Solid Gradient Fill */
  /* User: "środek litery powoli zabarwił się na różowo" -> implied solid or strong glow */
}

@keyframes dash {
  to {
    stroke-dashoffset: 200; /* Move by total pattern length (100+100) */
  }
}

.falling-star {
  position: absolute;
  width: 4px;
  height: 4px;
  background-color: #ffffff; /* White Star */
  border-radius: 50%;
  box-shadow: 
    0 0 4px #ffffff,
    0 0 8px #ffffff,
    0 0 12px #4da6ff; /* White core, blue glow */
  z-index: 9999;
  pointer-events: none;
}

.falling-star::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 2px;
  height: 60px;
  background: linear-gradient(to top, rgba(77, 166, 255, 0.8), rgba(77, 166, 255, 0)); /* Blue trail */
  transform: translate(-50%, -100%);
  transform-origin: bottom center;
  z-index: -1;
}

/* Pure White Star Variant */
.falling-star.white-variant {
  box-shadow: 
    0 0 4px #ffffff,
    0 0 8px #ffffff,
    0 0 12px #ffffff; /* Pure white glow */
}

.falling-star.white-variant::after {
  background: linear-gradient(to top, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0)); /* White trail */
}

/* Background Star Particles */
.comet-particle {
  position: fixed;
  pointer-events: none;
  border-radius: 50%;
  z-index: 1;
}

.comet-particle.white {
  background: white;
  box-shadow: 0 0 4px white;
}

.comet-particle.black {
  background: rgb(255, 255, 255);
  border-radius: 0; /* Pixels are square */
  z-index: 2; /* On top of white trail to create "holes" */
}

/* Neon Active States for Blocks */
main.container.neon-active {
  border-color: #fff;
  box-shadow: 0 0 26px rgba(255,255,255,0.8), inset 0 0 16px rgba(255,255,255,0.35);
}

.avatar.neon-active {
  border-color: #fff;
  box-shadow: 0 0 18px rgba(255,255,255,0.7), inset 0 0 12px rgba(255,255,255,0.35);
}

.btn.neon-active {
  border-color: #fff;
  box-shadow: 0 0 18px rgba(255,255,255,0.7), inset 0 0 12px rgba(255,255,255,0.35);
}

/* Background Stars */
.bg-star {
  position: absolute;
  background: white;
  border-radius: 50%;
  box-shadow: 0 0 4px rgba(255, 255, 255, 0.8), 0 0 8px rgba(255, 255, 255, 0.4);
  z-index: 0;
  pointer-events: none;
}

@keyframes twinkle {
  0%, 100% { opacity: 0.3; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.2); }
}

@keyframes fadeInOut {
  0% { opacity: 0; }
  50% { opacity: 1; }
  100% { opacity: 0; }
}

.bg-star.static {
  animation: twinkle var(--duration) ease-in-out infinite;
  animation-delay: var(--delay);
}

.bg-star.fading {
  animation: fadeInOut var(--duration) ease-in-out infinite;
  animation-delay: var(--delay);
}