/* Color palette */
:root {
    --brand: #537c78;
    --bg-light: #f2f6f6;
    --text-dark: #223231;
    --text-med: #405e5b;
    --card-bg: #ffffff;
    --radius: 12px;
    --gap: 2rem;
    --transition: 0.25s ease;
    
}

/* Global reset & typography */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat';
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    padding: var(--gap);
}

a {
    color: var(--brand);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    text-decoration: underline;
}

/* Header */
header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--gap);
}

.iconify {
    font-size: 3rem;
    color: var(--brand);
    display: block;
    margin: 0 auto 0.5rem;
}

header h1 {
    font-size: 2.75rem;
    margin-bottom: 0.25rem;
}

header .subtitle {
    color: var(--text-med);
    font-size: 1.125rem;
}

/* Layout */
.container {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: var(--gap);
    max-width: 1200px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }

    nav {
        display: none;
    }
}

/* Sidebar nav */
nav {
    position: sticky;
    top: calc(var(--gap) + 1rem);
    background: var(--card-bg);
    padding: var(--gap);
    border-radius: var(--radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    align-self: start;
}

nav h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--brand);
}

nav ul {
    list-style: none;
}

nav li+li {
    margin-top: 0.5rem;
}

nav a {
    display: block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

nav a:hover,
nav a:focus {
    background: rgba(83, 124, 120, 0.1);
    text-decoration: none;
}

/* Main card */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    padding: var(--gap);
}

.card h2{
    margin-bottom: 8px;
}

.updated {
    color: var(--text-med);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

/* Section headings with accent bars */
h2 {
    position: relative;
    margin-top: 2rem;
    padding-left: 0.75rem;
    border-left: 4px solid var(--brand);
    font-size: 1.5rem;
}

h3 {
    margin-top: 1.5rem;
    font-size: 1.25rem;
    color: var(--text-dark);
}

/* List styles */
ul {
    margin: 0.5rem 0 1rem 1.25rem;
}

ul ul {
    margin-top: 0.5rem;
}

/* Footer thank-you */
.thank-you {
    margin-top: var(--gap);
    font-style: italic;
    text-align: center;
    color: var(--text-med);
}