/* variables */

:root {
	--bg:          #0C1E35;
	--panel:       #1A2942;
	--border:      #2a3f5f;
	--accent:      #60A5FA;
	--accent-dark: #3b82f6;
	--error:       #F87171;
	--text:        #E0F2FE;
	--muted:       #7DD3FC;
	--purple:      #a78bfa;
	--yellow:      #FBBF24;
	--orange:      #fb923c;
}

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

/* base */

body {
	background: var(--bg);
	color: var(--text);
	font-family: 'Fira Code', monospace;
}

/* layout */

.page {
	display: grid;
	grid-template-columns: 200px 1fr;
	min-height: 100vh;
}

/* sidebar */

.sidebar {
	background: var(--panel);
	border-right: 1px solid var(--border);
	padding: 16px;
	position: sticky;
	top: 0;
	height: 100vh;
}

.sidebar h1 {
	font-size: 12px;
	color: var(--muted);
	margin-bottom: 16px;
}

.sidebar a {
	display: block;
	padding: 5px 8px;
	color: var(--muted);
	font-size: 14px;
	text-decoration: none;
}

.sidebar a:hover {
	color: var(--text);
}

.sidebar .group {
	display: block;
	font-size: 12px;
	color: var(--text);
	margin: 16px 0 6px 8px;
}

/* content */

.content {
	padding: 32px 48px;
	max-width: 800px;
}

.content h1 {
	font-size: 24px;
	color: var(--accent);
	margin-bottom: 8px;
}

.content p {
	color: var(--muted);
	margin-bottom: 32px;
}

#menu-btn {
    display: none;
	top: 20px;
	right: 20px;
	height: 40px;
	width: 40px;
	position: fixed;
    background: var(--panel);
    color: var(--text);
	border: none;
    font-family: 'Fira Code', monospace;
    cursor: pointer;
}

.section {
	margin-bottom: 40px;
}

.section h2 {
	color: var(--accent);
	font-size: 16px;
	border-bottom: 1px solid var(--border);
	padding-bottom: 6px;
	margin-bottom: 16px;
}

.section h3 {
	color: var(--yellow);
	font-size: 14px;
	margin: 16px 0 6px;
}

.section p {
	color: var(--text);
	font-size: 14px;
	line-height: 1.6;
	margin-bottom: 16px;
}

/* instruction table */

.row-header {
	display: grid;
	grid-template-columns: 70px 1fr 1fr;
    column-gap: 12px;
	padding: 5px 12px;
	font-size: 12px;
	color: var(--muted);
	border-bottom: 1px solid var(--border);
}

.row {
	display: grid;
	grid-template-columns: 70px 1fr 1fr;
    column-gap: 12px;
	padding: 10px 12px;
	font-size: 14px;
	line-height: 1.6;
	border-bottom: 1px solid var(--border);
}

.row:hover {
	background-color: var(--panel);
}

.row-header-gap {
	margin-top: 8px;
}

/* code block */

.code {
	background: var(--panel);
	border-left: 3px solid var(--accent);
	padding: 12px 16px;
	font-size: 14px;
	line-height: 1.9;
	margin: 8px 0;
}

.keyword { color: var(--error); }
.op { color: var(--error); font-weight: bold; }
.reg { color: var(--accent); }
.num { color: var(--orange); }
.hex { color: var(--purple); }
.label { color: var(--yellow); }
.comment { color: var(--muted); font-style: italic; }

.note {
	margin-top: 12px;
}

/* changes for mobile */

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

    .row div,
    .row-header div {
        margin-bottom: 4px;
    }

    .page {
        display: flex;
        flex-direction: column;
    }

	#menu-btn {
		display: block;
    }

	.sidebar {
        position: fixed;
        top: 0;
        left: -260px;
        width: 240px;
        height: 100%;
        z-index: 5;
        transition: left 0.25s ease;
    }

    .sidebar.open {
        left: 0;
    }

	.row:hover {
		background-color: inherit;
	}
}