/* --- Root Variables: The Control Panel for Your Theme --- */
:root {
  /* Colors */
  --color-text-main: #f0f0f0;
  --color-text-bright: #ffffff;
  --color-primary: #00ffff;   /* Neon Cyan */
  --color-primary-dark: #00cccc;
  --color-accent: #ffa500;    /* Orange */
  --color-link: #ffff66;      /* Bright Yellow */
  --color-link-hover: #00bfff; /* Deep Sky Blue */
  --color-theorem-bg: rgba(0, 255, 127, 0.08); /* Spring Green */
  --color-theorem-border: #00ff7f;

  /* Typography */
  --font-body: 'Caveat', 'Indie Flower', cursive, sans-serif;
  --font-math: 'Georgia', serif;
  
  /* Layout & Spacing */
  --golden-ratio: 1.618;
  --spacing-unit: 1rem;
  --content-width: 61.8rem;
}


/* --- General Styling & Background --- */
html {
  scroll-behavior: smooth;
}

body {
  background-image: url('background2.jpg');
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center;
  
  color: var(--color-text-main);
  font-family: var(--font-body);
  font-size: 1.25em; /* A slightly larger base font size for the handwritten style */
  line-height: var(--golden-ratio);
  
  max-width: var(--content-width);
  padding: calc(var(--spacing-unit) * 2);
  margin: auto;
  position: relative;
  z-index: 1;
}

/* This pseudo-element creates a dark overlay for better text readability */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6); /* Adjust opacity here */
  z-index: -1; /* Places it behind the content */
}


/* --- Typography --- */
h1, h2 {
  color: var(--color-primary);
  border-bottom: 2px dashed var(--color-primary-dark);
  padding-bottom: calc(var(--spacing-unit) / 2);
  margin-top: calc(var(--spacing-unit) * 2.5);
  margin-bottom: var(--spacing-unit);
  font-weight: 700;
}

.title {
  color: var(--color-accent);
  text-align: center;
  font-size: 2.8em;
  text-shadow: 2px 2px 4px #000;
  border-bottom: none;
  margin-top: 0;
}

p {
  color: var(--color-text-bright);
  margin-bottom: var(--spacing-unit);
  font-size: 1.618rem; /* <-- ADD THIS LINE - Adjust the value as you like */
}

ul {
  list-style-type: '→ ';
  margin-left: calc(var(--spacing-unit) * 2);
  margin-bottom: var(--spacing-unit);
}

li {
  padding-left: 0.5rem;
  margin-bottom: calc(var(--spacing-unit) / 2);
}


/* --- Links --- */
a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  text-decoration: underline;
  color: var(--color-link-hover);
}

/* Style for links pointing to equations */
.ref-link {
  font-family: var(--font-math);
  font-style: italic;
  color: var(--color-primary-dark);
}


/* --- Highlighted Section Boxes --- */
.section-box {
  background-color: rgba(255, 255, 255, 0.05);
  padding: 0.1rem calc(var(--spacing-unit) * 1.5);
  margin: calc(var(--spacing-unit) * 2) 0;
  border-left: 4px solid;
  border-radius: 8px;
}

.section-box.is-highlight {
  background-color: rgba(0, 255, 255, 0.07);
  color: #ccffff;
  border-color: var(--color-primary-dark);
}

.section-box.is-accent {
  background-color: rgba(255, 255, 0, 0.05);
  color: #ffff00;
  border-color: #ffcc00;
}

.section-box.is-theorem {
  text-align: center;
  background-color: var(--color-theorem-bg);
  border: 2px solid var(--color-theorem-border);
  border-left: 4px solid var(--color-theorem-border);
  color: var(--color-text-bright);
}
.section-box.is-theorem strong {
  color: var(--color-theorem-border);
}


/* --- Math & Equation Styling --- */
.math,
mjx-container { /* Target MathJax directly */
  color: var(--color-text-bright);
  font-family: var(--font-math);
  font-size: 1.1em !important;
}

/* Center numbered equations and give them space */
.equation-box {
  text-align: center;
  margin: var(--spacing-unit) 0;
}


/* --- Footer --- */
.site-footer {
  background-color: rgba(17, 17, 17, 0.8);
  color: var(--color-text-bright);
  text-align: center;
  padding: calc(var(--spacing-unit) * 1.5);
  margin-top: calc(var(--spacing-unit) * 3);
  border-top: 2px solid var(--color-text-bright);
  width: 100vw;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
}

.site-footer p {
  margin: 0.5rem 0;
}

.site-footer a {
  color: #fdd835;
  font-weight: bold;
}