@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap');

:root {
  --bg: #f5f7fa;
  --text: #333;
  --header-gradient: linear-gradient(135deg, #4A90E2, #7B4397);
  --meta-bg: rgba(255, 255, 255, 0.18);
  --meta-text: #fff;
  --box-bg: #fff;
  --accent: #4A90E2;
}

body.dark {
  --bg: #1e1e2f;
  --text: #e0e0e0;
  --header-gradient: linear-gradient(135deg, #7B4397, #4A90E2);
  --meta-bg: rgba(255, 255, 255, 0.1);
  --meta-text: #f0f0f0;
  --box-bg: #2a2a3b;
  --accent: #7dafff;
}

body {
  font-family: 'Poppins', sans-serif;
  background: var(--bg);
  color: var(--text);
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
}


header {
  background: var(--header-gradient);
  color: var(--meta-text);
  padding: 2.5rem 2rem 3rem 2rem;
  border-radius: 12px;
  box-shadow: 0 6px 12px rgba(0,0,0,0.1);
  text-align: center;
  position: relative;
}

header h1 {
  margin: 0 0 1rem 0;
  font-weight: 700;
  font-size: 2.4rem;
  text-shadow: 0 3px 6px rgba(0,0,0,0.25);
  color: #fff;
}


.meta {
  margin-top: 0.5rem;
  font-size: 1rem;
  display: inline-block;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  background: var(--meta-bg);
  color: var(--meta-text);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
  backdrop-filter: blur(6px);
  line-height: 1.5;
}


.theme-toggle {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--meta-bg);
  color: var(--meta-text);
  border: none;
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s;
}
.theme-toggle:hover {
  background: rgba(255,255,255,0.3);
}


main {
  background: var(--box-bg);
  padding: 2rem;
  border-radius: 12px;
  margin-top: 2rem;
  box-shadow: 0 6px 12px rgba(0,0,0,0.08);
  transition: background 0.3s;
}

h1, h2, h3 {
  color: var(--accent);
}

code {
  background: rgba(0,0,0,0.08);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-family: monospace;
}

img {
  max-width: 100%;
  border-radius: 8px;
  margin: 1rem 0;
}

footer {
  margin-top: 3rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text);
}