* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* variables */
  --container-max-width: 1200px;
  --sidebar-width: 300px;
  --sidebar-min-width: 220px;
  --page-gutter: 1rem;
}

body {
  font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: #d4f3f1;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: #0E0F12;
}

/* type */
h1 {
  font-family: "Playfair Display", serif;
  font-size: clamp(1.6rem, 4.5vw, 3rem);
  font-style: normal;
  font-weight: 600;
  line-height: 1.05;
  margin: 1.25rem;
  padding: 1.25rem;
}

h2 {
  font-family: "Playfair Display", serif;
  color: #0E0F12;
  font-size: clamp(1.25rem, 3.8vw, 2.25rem);
  font-style: normal;
  font-weight: 600;
  line-height: 1.1;
  margin-top: 0.25rem;
  margin-bottom: 0.5rem;
}

h3 {
  font-family: Inter, system-ui, sans-serif;
  font-size: clamp(1rem, 2.8vw, 1.5rem);
  font-style: normal;
  font-weight: 500;
  line-height: 1.15;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

p {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

/* code blocks should wrap on small screens?? */
code {
  font-size: 0.95rem;
  max-width: 100%;
  display: block;
  white-space: pre-wrap;
  word-break: break-word;
}

/* main flexbox container (full width but constrained with max-width,
   centered so layout shrinks naturally on phones) */
.container {
  display: flex;
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  gap: 2rem;
  min-height: calc(100vh - 2rem);
  align-items: flex-start;
  padding: var(--page-gutter);
  flex-wrap: nowrap;
}

/* nav/sidebar */
.sidebar {
  background: #111;
  color: white;
  width: var(--sidebar-width);
  min-width: var(--sidebar-min-width);
  padding: 1rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto; 
  border-radius: 8px;
}

.sidebar ul {
  list-style: none;
}

.sidebar li {
  margin-bottom: 1rem;
}

.sidebar a {
  color: white;
  text-decoration: none;
  font-size: 0.95rem;
}

.sidebar a:hover {
  text-decoration: underline;
}

/* content flex */
.content {
  flex: 1;
  padding: 1.25rem;
  background-color: transparent; 
  min-width: 0; 
}

/* hero */
.hero {
  text-align: left;
  margin-bottom: 2rem;
}

.hero h1 {
  /* local override for hero title — still fluid */
  font-size: clamp(1.25rem, 6vw, 1.6rem);
  font-weight: 700;
  margin-bottom: 1rem;
  padding: 0;
  margin: 0 0 1rem 0;
}

.hero img {
  width: 100%;
  max-width: 450px;
  height: auto;
  border-radius: 4px;
}

/* section chunks */
section {
  background: #b7ebe6;
  margin-bottom: 2rem;
  padding: 1rem;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

section img {
  margin-top: 0.5rem;
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 3px;
}

section ul {
  padding-left: 1.5rem;
  margin-left: 0;
}

/* footer */
.footer {
  text-align: center;
  margin-top: 3rem;
}

.footer button {
  background: #111;
  color: white;
  border: none;
  padding: 0.7rem 1rem;
  margin: 0.5rem;
  border-radius: 20px;
  cursor: pointer;
}

.footer p {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: #444;
}

/* iphone media query */
@media (max-width: 640px) {
  .container {
    flex-direction: column;
    padding: 0.5rem;
    gap: 1rem;
  }

  /* transform sidebar into a horizontal/top nav area on small devices */
  .sidebar {
    width: 100%;
    min-width: 0;
    height: auto;
    position: relative;
    padding: 0.5rem 0;
    background: transparent;
    color: #0E0F12;
    box-shadow: none;
    border-radius: 0;
  }

  .sidebar ul {
    display: flex;
    gap: 1rem;
    padding-left: 0.5rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .sidebar li {
    margin-bottom: 0;
    white-space: nowrap;
  }

  .sidebar a {
    color: #0E0F12;
    padding: 0.5rem;
    display: inline-block;
    font-size: 0.95rem;
  }

  .content {
    padding: 0.75rem;
  }

  .hero img, section img {
    max-width: 100%;
    height: auto;
  }