:root {
  --bg: #121414;           /* Dark base */
  --panel: #1c1f1c;        /* Dark panel */
  --text: #e8efe4;         /* Soft light text */
  --muted: #b7c2b0;        /* Muted text */
  --olive: #3b5323;        /* Olive */
  --green: #6b8e23;        /* Accent green */
  --accent-hover: #8fbc8f; /* Hover accent for dark */
  --shadow: rgba(0, 0, 0, 0.35);
}

html.dark {
  color-scheme: dark;
}

html:not(.dark) {
  /* Light fallback variables */
  --bg: #f9f9f6;
  --panel: #ffffff;
  --text: #2e2e2e;
  --muted: #555;
  --olive: #3b5323;
  --green: #6b8e23;
  --accent-hover: #3b5323;
  --shadow: rgba(0, 0, 0, 0.12);
}

/* Base */
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 2rem;
}

.container {
  text-align: center;
  padding: 2rem;
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 8px 24px var(--shadow);
  max-width: 560px;
  width: 100%;
}

/* Header */
header {
  margin-bottom: 1.5rem;
}
.logo {
  width: 56px;
  height: 56px;
  display: block;
  margin: 0 auto 0.5rem auto;
}
h1 {
  margin: 0.25rem 0 0.25rem 0;
  font-size: 2.1rem;
  letter-spacing: 0.3px;
  color: var(--olive);
}
.tagline {
  font-size: 1rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

/* Navigation */
nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
nav li { margin: 0.75rem 0; }

nav a {
  display: block;
  padding: 1rem 1.25rem;
  text-decoration: none;
  background: var(--green);
  color: #fff;
  border-radius: 10px;
  font-weight: 600;
  transition: transform 0.18s ease, background 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 2px 8px var(--shadow);
}
nav a:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--shadow);
}

/* Footer */
footer {
  margin-top: 1.5rem;
  font-size: 0.92rem;
  color: var(--muted);
}
#themeToggle {
  background: transparent;
  border: 2px solid var(--green);
  color: var(--green);
  padding: 0.55rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 0.75rem;
  transition: background 0.25s ease, color 0.25s ease, transform 0.15s ease;
}
#themeToggle:hover {
  background: var(--green);
  color: #fff;
  transform: translateY(-1px);
}

/* Responsive */
@media (max-width: 420px) {
  .container { padding: 1.5rem; }
  h1 { font-size: 1.8rem; }
  nav a { padding: 0.9rem 1rem; }
}

/* Fireflies container */
.fireflies {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none; /* don’t block clicks */
  overflow: hidden;
  z-index: 0;
}

.fireflies {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

/* Hide fireflies unless dark mode is active */
.fireflies {
  display: none;
}

html.dark .fireflies {
  display: block;
}

.fireflies {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

/* Wrapper handles scatter offset */
.firefly-wrapper {
  position: absolute;
  will-change: transform;
}

/* Inner dot handles drifting + flicker */
.firefly {
  width: 6px; height: 6px;
  background: #aaffaa;
  border-radius: 50%;
  box-shadow: 0 0 8px #aaffaa, 0 0 16px #88ff88;
  animation: floatY 20s linear infinite,
             swayX 6s ease-in-out infinite alternate,
             flicker 2s ease-in-out infinite alternate;
}

@keyframes floatY {
  from { transform: translateY(100vh); }
  to   { transform: translateY(-10vh); }
}

@keyframes swayX {
  from { transform: translateX(-20px); }
  to   { transform: translateX(20px); }
}

@keyframes flicker {
  from { opacity: 0.3; }
  to   { opacity: 1; }
}

/* Only show in dark mode */
.fireflies { display: none; }
html.dark .fireflies { display: block; }