/* ===== Global safety defaults ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 1.25rem;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  color: #111;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Navigation ===== */
nav {
  margin: 1rem 0;
}

nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #0066cc;
}

nav a:hover {
  text-decoration: underline;
}

/* ===== Headings ===== */
h1 {
  margin-top: 0;
}

h2 {
  margin-top: 1.5rem;
}

/* ===== Mobile safety ===== */
img {
  max-width: 100%;
  height: auto;
}

p, li, a {
  overflow-wrap: anywhere;
}

/* ===== Hard mobile overflow protection ===== */
body, p, li, a {
  overflow-wrap: break-word;
  word-break: break-word;
}

ul {
  padding-left: 1.25rem;
}

li {
  max-width: 100%;
}

/* ===== Content polish ===== */

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.35rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

p {
  margin-top: 0.5rem;
  margin-bottom: 1rem;
  max-width: 65ch; /* optimal reading width */
}

/* Lists */
ul {
  padding-left: 1.25rem;
  margin-top: 0.5rem;
}

li {
  margin-bottom: 0.6rem;
  max-width: 75ch;
}

/* Improve readability on large screens only */
@media (min-width: 1100px) {
  body {
    max-width: 1000px;
  }
}