/*
 * Curved Spacetime is a work-in-progress easy-to-use modular simulator for General Relativity.
 * Copyright (C) 2025-2026 Anthony Michalek (Codetoil)
 *
 * This file is part of Curved Spacetime
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program.
 * If not, see <https://www.gnu.org/licenses/>.
 */

:root
{
	--bg: #fdfdfc;
	--fg: #1b1b18;
	--muted: #5d5d55;
	--rule: #dcdcd4;
	--accent: #2d5b8a;
	--code-bg: #f4f4f0;
	--note-bg: #f0f4f8;
	--note-edge: #2d5b8a;
	--warn-bg: #fbf3e8;
	--warn-edge: #a86a1f;
	--req-edge: #c8c8be;
}

@media (prefers-color-scheme: dark)
{
	:root
	{
		--bg: #16161a;
		--fg: #e6e6e1;
		--muted: #a0a099;
		--rule: #33333a;
		--accent: #7fb0e0;
		--code-bg: #1e1e24;
		--note-bg: #1a2430;
		--note-edge: #7fb0e0;
		--warn-bg: #2a2117;
		--warn-edge: #d29a4a;
		--req-edge: #3c3c44;
	}
}

*
{
	box-sizing: border-box;
}

body
{
	margin: 0 auto;
	padding: 2.5rem 1.25rem 4rem;
	max-width: 46rem;
	background: var(--bg);
	color: var(--fg);
	font-family: Charter, Georgia, "Times New Roman", serif;
	font-size: 1.02rem;
	line-height: 1.65;
	text-rendering: optimizeLegibility;
}

/* ---- headings ---------------------------------------------------------- */

h1, h2, h3
{
	font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
	line-height: 1.25;
	font-weight: 600;
}

h1
{
	margin: 0 0 1.25rem;
	font-size: 1.95rem;
	letter-spacing: -0.015em;
}

h2
{
	margin: 3rem 0 1rem;
	padding-bottom: 0.35rem;
	border-bottom: 1px solid var(--rule);
	font-size: 1.4rem;
}

h3
{
	margin: 2rem 0 0.75rem;
	font-size: 1.12rem;
}

/* ---- document header --------------------------------------------------- */

header
{
	padding-bottom: 1.5rem;
	border-bottom: 2px solid var(--rule);
}

.docinfo
{
	display: grid;
	grid-template-columns: max-content 1fr;
	gap: 0.3rem 1rem;
	margin: 0;
	font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
	font-size: 0.85rem;
}

.docinfo dt
{
	color: var(--muted);
	text-transform: uppercase;
	letter-spacing: 0.06em;
	font-size: 0.74rem;
	padding-top: 0.15rem;
}

.docinfo dd
{
	margin: 0;
}

/* ---- table of contents ------------------------------------------------- */

nav
{
	margin: 2rem 0;
	padding: 1.1rem 1.4rem;
	background: var(--code-bg);
	border-radius: 4px;
}

nav h2
{
	margin: 0 0 0.5rem;
	padding: 0;
	border: 0;
	font-size: 0.78rem;
	text-transform: uppercase;
	letter-spacing: 0.09em;
	color: var(--muted);
}

nav ol
{
	margin: 0;
	padding-left: 1.4rem;
	font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
	font-size: 0.94rem;
	line-height: 1.85;
}

/* ---- links ------------------------------------------------------------- */

a
{
	color: var(--accent);
	text-decoration-thickness: 1px;
	text-underline-offset: 2px;
}

a:hover
{
	text-decoration-thickness: 2px;
}

/* ---- code -------------------------------------------------------------- */

code, pre, var
{
	font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
	font-style: normal;
}

code
{
	background: var(--code-bg);
	padding: 0.1em 0.35em;
	border-radius: 3px;
	font-size: 0.87em;
	word-break: break-word;
}

pre
{
	background: var(--code-bg);
	padding: 1rem 1.15rem;
	border-radius: 4px;
	border-left: 3px solid var(--rule);
	overflow-x: auto;
	font-size: 0.84rem;
	line-height: 1.55;
}

pre code
{
	background: none;
	padding: 0;
	font-size: inherit;
	word-break: normal;
}

/* ---- requirements ------------------------------------------------------ */

.req
{
	margin: 1.1rem 0;
	padding: 0.55rem 0 0.55rem 1rem;
	border-left: 3px solid var(--req-edge);
	scroll-margin-top: 1rem;
}

.req:target
{
	border-left-color: var(--accent);
	background: var(--note-bg);
}

.req strong:first-child
{
	font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
	font-size: 0.9em;
	color: var(--accent);
}

/* ---- callouts ---------------------------------------------------------- */

.note, .warn
{
	margin: 1.25rem 0;
	padding: 0.85rem 1.15rem;
	border-left: 3px solid var(--note-edge);
	background: var(--note-bg);
	border-radius: 0 3px 3px 0;
	font-size: 0.94rem;
}

.warn
{
	border-left-color: var(--warn-edge);
	background: var(--warn-bg);
}

/* ---- tables ------------------------------------------------------------ */

table
{
	width: 100%;
	margin: 1.4rem 0;
	border-collapse: collapse;
	font-size: 0.9rem;
	display: block;
	overflow-x: auto;
}

thead th
{
	text-align: left;
	font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
	font-size: 0.78rem;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--muted);
	border-bottom: 2px solid var(--rule);
	padding: 0.4rem 0.7rem 0.4rem 0;
}

td
{
	padding: 0.45rem 0.7rem 0.45rem 0;
	border-bottom: 1px solid var(--rule);
	vertical-align: top;
}

/* ---- definition lists -------------------------------------------------- */

.terms dt
{
	margin-top: 1rem;
	font-weight: 600;
}

.terms dd
{
	margin: 0.2rem 0 0 1.5rem;
}

dfn
{
	font-style: normal;
	font-weight: 600;
}

/* ---- checklist --------------------------------------------------------- */

.checklist
{
	padding-left: 1.3rem;
}

.checklist li
{
	margin: 0.45rem 0;
}

/* ---- footer ------------------------------------------------------------ */

footer
{
	margin-top: 4rem;
	padding-top: 1.25rem;
	border-top: 1px solid var(--rule);
	color: var(--muted);
	font-size: 0.85rem;
}

footer p
{
	margin: 0.3rem 0;
}