/* ==========================================================================
   Peptide Research Tools — lab notebook design system
   Paper, graphite and vermilion. Mono numerals for every measured value.
   ========================================================================== */

:root {
	--rlt-paper: #f7f4ec;
	--rlt-paper-deep: #efe9dc;
	--rlt-card: #fffdf8;
	--rlt-ink: #1f2328;
	--rlt-ink-2: #3a3f45;
	--rlt-muted: #5e636a;
	--rlt-rule: #ddd5c4;
	--rlt-rule-strong: #bfb49e;
	--rlt-blue: #2f5d8a;
	--rlt-amber: #fbefd5;
	--rlt-amber-rule: #e4c98d;
	--rlt-graphite: #22262b;
	--rlt-graphite-2: #2d3238;
	--rlt-graphite-line: rgba(236, 230, 214, 0.14);
	--rlt-screen: #ece6d6;
	--rlt-screen-dim: #a9a597;
	--rlt-ok: #3f7d58;

	--rlt-accent: #d9412b;
	--rlt-accent-ink: #a9321f;
	--rlt-accent-wash: #fbe9e5;

	--rlt-font-head: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
	--rlt-font-body: "Manrope", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
	--rlt-font-mono: "DM Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

	--rlt-wrap: 1200px;
	--rlt-radius: 4px;
	--rlt-line: 1.5px;
	--rlt-shadow: 4px 4px 0 var(--rlt-ink);
	--rlt-header-h: 68px;
}

/* Base ------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
	-webkit-text-size-adjust: 100%;
	text-size-adjust: 100%;
	scroll-padding-top: calc(var(--rlt-header-h) + 24px);
}

body {
	margin: 0;
	background-color: var(--rlt-paper);
	color: var(--rlt-ink);
	font-family: var(--rlt-font-body);
	font-size: 1rem;
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
	text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
::selection { background: var(--rlt-accent); color: #fff; }

:focus-visible {
	outline: 2px solid var(--rlt-accent);
	outline-offset: 2px;
}

h1, h2, h3, h4 {
	font-family: var(--rlt-font-head);
	font-weight: 600;
	line-height: 1.15;
	letter-spacing: -0.02em;
	margin: 0;
	color: var(--rlt-ink);
}

p { margin: 0 0 1em; }

code, kbd, samp, .rlt-mono { font-family: var(--rlt-font-mono); }

.screen-reader-text {
	position: absolute !important;
	width: 1px; height: 1px;
	padding: 0; margin: -1px;
	overflow: hidden; clip: rect(0, 0, 0, 0);
	white-space: nowrap; border: 0;
}

.screen-reader-text:focus {
	position: fixed !important;
	top: 12px; left: 12px; z-index: 1000;
	width: auto; height: auto; clip: auto;
	padding: 10px 16px;
	background: var(--rlt-ink); color: var(--rlt-paper);
	border-radius: var(--rlt-radius);
	text-decoration: none;
}

.rlt-wrap {
	width: 100%;
	max-width: var(--rlt-wrap);
	margin: 0 auto;
	padding: 0 24px;
}

.rlt-icon { width: 1.15em; height: 1.15em; flex: none; }

.rlt-eyebrow {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	margin: 0 0 14px;
	font-family: var(--rlt-font-mono);
	font-size: 0.74rem;
	font-weight: 500;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--rlt-ink-2);
}

.rlt-eyebrow::before {
	content: "";
	width: 22px;
	height: 2px;
	background: var(--rlt-accent);
}

.rlt-code {
	display: inline-block;
	font-family: var(--rlt-font-mono);
	font-size: 0.72rem;
	font-weight: 500;
	letter-spacing: 0.04em;
	padding: 1px 6px;
	border: 1px solid currentColor;
	border-radius: 2px;
	color: var(--rlt-accent-ink);
	background: var(--rlt-card);
	line-height: 1.5;
}

/* Buttons ---------------------------------------------------------------- */
.rlt-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	padding: 10px 16px;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
	color: var(--rlt-ink);
	font-weight: 600;
	font-size: 0.9rem;
	line-height: 1.2;
	text-decoration: none;
	cursor: pointer;
	transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease, color 0.12s ease;
}

.rlt-btn:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--rlt-ink); }
.rlt-btn:active { transform: none; box-shadow: none; }

.rlt-btn--primary {
	background: var(--rlt-accent);
	border-color: var(--rlt-ink);
	color: #fff;
	box-shadow: 3px 3px 0 var(--rlt-ink);
}

.rlt-btn--primary:hover { box-shadow: 5px 5px 0 var(--rlt-ink); }

.rlt-btn--light {
	background: transparent;
	border-color: var(--rlt-graphite-line);
	color: var(--rlt-screen);
	padding: 8px 12px;
	font-size: 0.82rem;
}

.rlt-btn--light:hover { border-color: var(--rlt-screen); box-shadow: none; transform: none; background: rgba(236, 230, 214, 0.06); }

.rlt-btn--ghost {
	background: transparent;
	border-color: transparent;
	color: var(--rlt-screen-dim);
	padding: 8px 10px;
	font-size: 0.82rem;
}

.rlt-btn--ghost:hover { color: var(--rlt-screen); box-shadow: none; transform: none; }
.rlt-btn.is-done { background: var(--rlt-accent); color: #fff; }
.rlt-btn--light.is-done,
.rlt-btn--ghost.is-done { border-color: var(--rlt-accent); }

.rlt-link-arrow {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	font-weight: 600;
	text-decoration: none;
	color: var(--rlt-ink);
	border-bottom: var(--rlt-line) solid var(--rlt-accent);
	padding-bottom: 1px;
}

.rlt-link-arrow .rlt-icon { transition: transform 0.15s ease; }
.rlt-link-arrow:hover .rlt-icon { transform: translateX(3px); }

/* Header ----------------------------------------------------------------- */
.rlt-header {
	position: sticky;
	top: 0;
	z-index: 50;
	border-bottom: var(--rlt-line) solid var(--rlt-ink);
}

/* The blur sits on a pseudo-element: backdrop-filter on the header itself would
   trap the fixed-position mobile menu inside the header bar. */
.rlt-header::before {
	content: "";
	position: absolute;
	inset: 0;
	z-index: -1;
	background: var(--rlt-paper);
	background: color-mix(in srgb, var(--rlt-paper) 94%, transparent);
	-webkit-backdrop-filter: saturate(1.2) blur(8px);
	backdrop-filter: saturate(1.2) blur(8px);
}

.admin-bar .rlt-header { top: 32px; }
@media (max-width: 782px) { .admin-bar .rlt-header { top: 46px; } }
@media (max-width: 600px) { .admin-bar .rlt-header { top: 0; } }

.rlt-header__bar {
	display: flex;
	align-items: center;
	gap: 24px;
	height: var(--rlt-header-h);
}

.rlt-brand {
	display: inline-flex;
	align-items: center;
	gap: 12px;
	text-decoration: none;
	margin-right: auto;
	min-width: 0;
}

.rlt-brand .rlt-mark { width: 38px; height: 38px; flex: none; }
.rlt-brand img { max-height: 44px; width: auto; }

.rlt-brand__text { display: flex; flex-direction: column; line-height: 1.1; min-width: 0; }

.rlt-brand__name {
	font-family: var(--rlt-font-head);
	font-weight: 700;
	font-size: 1.08rem;
	letter-spacing: -0.02em;
	white-space: nowrap;
}

.rlt-brand__tag {
	font-family: var(--rlt-font-mono);
	font-size: 0.68rem;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--rlt-muted);
	white-space: nowrap;
}

.rlt-nav__list {
	display: flex;
	align-items: center;
	gap: 4px;
	list-style: none;
	margin: 0;
	padding: 0;
}

.rlt-nav__trigger,
.rlt-nav__link {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	padding: 8px 12px;
	border: 0;
	border-radius: var(--rlt-radius);
	background: none;
	font-weight: 600;
	font-size: 0.94rem;
	text-decoration: none;
	color: var(--rlt-ink);
	cursor: pointer;
	position: relative;
}

.rlt-nav__trigger .rlt-icon { width: 16px; height: 16px; transition: transform 0.15s ease; }
.rlt-nav__trigger[aria-expanded="true"] .rlt-icon { transform: rotate(180deg); }
.rlt-nav__trigger:hover,
.rlt-nav__link:hover,
.rlt-nav__trigger[aria-expanded="true"] { background: var(--rlt-paper-deep); }

.rlt-nav__item.is-current > .rlt-nav__trigger::after,
.rlt-nav__item.is-current > .rlt-nav__link::after {
	content: "";
	position: absolute;
	left: 12px; right: 12px; bottom: 2px;
	height: 2px;
	background: var(--rlt-accent);
}

.rlt-header__cta { flex: none; }

.rlt-burger {
	display: none;
	align-items: center;
	justify-content: center;
	width: 42px; height: 42px;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
	cursor: pointer;
}

.rlt-burger .rlt-icon--close { display: none; }
.rlt-drawer-open .rlt-burger .rlt-icon--menu { display: none; }
.rlt-drawer-open .rlt-burger .rlt-icon--close { display: block; }

/* Mega panels */
.rlt-panel {
	position: absolute;
	left: 0; right: 0;
	top: 100%;
	border-bottom: var(--rlt-line) solid var(--rlt-ink);
	background: var(--rlt-card);
	box-shadow: 0 18px 40px -24px rgba(31, 35, 40, 0.45);
}

.rlt-panel[hidden] { display: none; }

.rlt-panel__inner {
	max-width: var(--rlt-wrap);
	margin: 0 auto;
	padding: 24px 24px 28px;
}

.rlt-panel__head {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	padding-bottom: 18px;
	margin-bottom: 20px;
	border-bottom: 1px dashed var(--rlt-rule-strong);
}

.rlt-finder {
	display: flex;
	align-items: center;
	gap: 10px;
	flex: 1;
	max-width: 520px;
	padding: 0 14px;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: #fff;
}

.rlt-finder input {
	flex: 1;
	min-width: 0;
	border: 0;
	padding: 11px 0;
	background: transparent;
	font-size: 0.95rem;
	outline: none;
}

.rlt-finder:focus-within { box-shadow: 0 0 0 3px var(--rlt-accent-wash); border-color: var(--rlt-accent); }

.rlt-panel__all {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	font-weight: 600;
	font-size: 0.9rem;
	text-decoration: none;
	color: var(--rlt-accent-ink);
}

.rlt-panel__cols {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 28px;
}

.rlt-panel__title {
	display: flex;
	align-items: center;
	gap: 8px;
	font-size: 0.98rem;
	margin-bottom: 4px;
}

.rlt-panel__title .rlt-icon { color: var(--rlt-accent); }
.rlt-panel__desc { font-size: 0.82rem; color: var(--rlt-muted); line-height: 1.45; margin: 0 0 10px; }

.rlt-panel ul { list-style: none; margin: 0; padding: 0; }

.rlt-panel li a {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 7px 8px;
	margin: 0 -8px;
	border-radius: 3px;
	text-decoration: none;
	font-weight: 500;
	font-size: 0.93rem;
}

.rlt-panel li a:hover { background: var(--rlt-paper-deep); }
.rlt-panel li a:hover .rlt-code { background: var(--rlt-accent); border-color: var(--rlt-accent); color: #fff; }
.rlt-panel__empty { margin: 8px 0 0; color: var(--rlt-muted); }

.rlt-panel__inner--guides { display: grid; grid-template-columns: 3fr 1fr; gap: 32px; }
.rlt-panel__inner--guides .rlt-panel__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.rlt-panel__aside {
	padding: 18px;
	border: 1px dashed var(--rlt-rule-strong);
	border-radius: var(--rlt-radius);
	background: var(--rlt-paper);
	font-size: 0.88rem;
}

.rlt-panel__aside .rlt-eyebrow { margin-bottom: 8px; }

.rlt-panel__feature {
	display: block;
	margin-top: 16px;
	padding: 14px;
	border-radius: var(--rlt-radius);
	background: var(--rlt-graphite);
	color: var(--rlt-screen);
	text-decoration: none;
}

.rlt-panel__feature .rlt-eyebrow { color: var(--rlt-screen-dim); }
.rlt-panel__feature strong { display: block; font-family: var(--rlt-font-head); font-size: 1rem; line-height: 1.3; }

/* Breadcrumbs ----------------------------------------------------------- */
.rlt-crumbs ol {
	display: flex;
	flex-wrap: wrap;
	gap: 4px 0;
	list-style: none;
	margin: 0 0 22px;
	padding: 0;
	font-family: var(--rlt-font-mono);
	font-size: 0.76rem;
	letter-spacing: 0.02em;
	color: var(--rlt-muted);
}

.rlt-crumbs li + li::before { content: "/"; margin: 0 8px; color: var(--rlt-rule-strong); }
.rlt-crumbs a { text-decoration: none; }
.rlt-crumbs a:hover { color: var(--rlt-accent-ink); text-decoration: underline; }
.rlt-crumbs [aria-current] { color: var(--rlt-ink); }

/* Page heads ------------------------------------------------------------- */
.rlt-main { display: block; padding-bottom: 96px; }

.rlt-pagehead { padding: 40px 0 32px; }

.rlt-pagehead h1 {
	font-size: clamp(2rem, 1.4rem + 2.4vw, 3.2rem);
	max-width: 22ch;
}

.rlt-lead {
	max-width: 62ch;
	margin-top: 16px;
	font-size: 1.12rem;
	color: var(--rlt-ink-2);
}

.rlt-meta-line {
	display: flex;
	flex-wrap: wrap;
	gap: 8px 18px;
	margin-top: 18px;
	font-family: var(--rlt-font-mono);
	font-size: 0.78rem;
	color: var(--rlt-muted);
}

/* Home: hero ------------------------------------------------------------ */
.rlt-hero { padding: 64px 0 56px; }

.rlt-hero__grid {
	display: grid;
	grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
	gap: 56px;
	align-items: center;
}

.rlt-hero h1 {
	font-size: clamp(2.6rem, 1.6rem + 4.2vw, 4.8rem);
	line-height: 1.02;
	letter-spacing: -0.035em;
	max-width: 13ch;
}

.rlt-hero h1 em {
	font-style: normal;
	background: linear-gradient(transparent 62%, var(--rlt-accent-wash) 62%, var(--rlt-accent-wash) 92%, transparent 92%);
	box-shadow: inset 0 -3px 0 var(--rlt-accent);
}

.rlt-hero__text { margin: 22px 0 28px; font-size: 1.14rem; color: var(--rlt-ink-2); max-width: 54ch; }

.rlt-hero__finder { position: relative; max-width: 560px; }

.rlt-hero__finder .rlt-finder {
	max-width: none;
	padding: 4px 6px 4px 16px;
	box-shadow: var(--rlt-shadow);
}

.rlt-hero__finder .rlt-finder input { font-size: 1.05rem; padding: 12px 0; }

.rlt-hero__results {
	position: absolute;
	left: 0; right: 0; top: calc(100% + 10px);
	z-index: 5;
	list-style: none;
	margin: 0;
	padding: 6px;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
	box-shadow: var(--rlt-shadow);
	max-height: 340px;
	overflow: auto;
}

.rlt-hero__results[hidden] { display: none; }
.rlt-hero__results a { display: flex; align-items: center; gap: 10px; padding: 8px 10px; text-decoration: none; border-radius: 3px; font-weight: 500; }
.rlt-hero__results a:hover { background: var(--rlt-paper-deep); }

.rlt-hero__chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; font-size: 0.85rem; }
.rlt-hero__chips span { color: var(--rlt-muted); padding: 5px 0; }

.rlt-chip {
	display: inline-flex;
	align-items: center;
	padding: 5px 10px;
	border: 1px solid var(--rlt-rule-strong);
	border-radius: 999px;
	background: var(--rlt-card);
	text-decoration: none;
	font-weight: 500;
}

.rlt-chip:hover { border-color: var(--rlt-ink); }

/* Instrument specimen card */
.rlt-specimen {
	position: relative;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: 6px;
	background: var(--rlt-graphite);
	color: var(--rlt-screen);
	box-shadow: 8px 8px 0 var(--rlt-accent);
	overflow: hidden;
}

.rlt-specimen__bar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 12px 18px;
	border-bottom: 1px solid var(--rlt-graphite-line);
	font-family: var(--rlt-font-mono);
	font-size: 0.72rem;
	letter-spacing: 0.1em;
	text-transform: uppercase;
	color: var(--rlt-screen-dim);
}

.rlt-specimen__dots { display: inline-flex; gap: 6px; }
.rlt-specimen__dots i { width: 8px; height: 8px; border-radius: 50%; background: var(--rlt-graphite-line); }
.rlt-specimen__dots i:first-child { background: var(--rlt-accent); }

.rlt-specimen__body { padding: 22px 22px 8px; }

.rlt-specimen__formula {
	font-family: var(--rlt-font-mono);
	font-size: clamp(1.3rem, 1rem + 1.2vw, 1.7rem);
	color: #fff;
	margin: 0 0 18px;
}

.rlt-specimen__rows { margin: 0; font-family: var(--rlt-font-mono); font-size: 0.88rem; }

.rlt-specimen__rows div {
	display: flex;
	justify-content: space-between;
	gap: 16px;
	padding: 9px 0;
	border-top: 1px dashed var(--rlt-graphite-line);
}

.rlt-specimen__rows dt { color: var(--rlt-screen-dim); }
.rlt-specimen__rows dd { margin: 0; color: var(--rlt-screen); }

.rlt-specimen__result {
	margin: 0 22px 22px;
	padding: 16px 18px;
	border: 1px solid var(--rlt-graphite-line);
	border-radius: var(--rlt-radius);
	background: #1a1d21;
}

.rlt-specimen__result small {
	display: block;
	font-family: var(--rlt-font-mono);
	font-size: 0.7rem;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: #f2a091;
}

.rlt-specimen__result strong { font-family: var(--rlt-font-mono); font-weight: 500; font-size: 2.1rem; color: #fff; letter-spacing: -0.02em; }
.rlt-specimen__result span { font-family: var(--rlt-font-mono); color: var(--rlt-screen-dim); margin-left: 6px; }

/* Stat strip */
.rlt-strip {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
	margin-top: 56px;
}

.rlt-strip > div { padding: 18px 20px; }
.rlt-strip > div + div { border-left: 1px dashed var(--rlt-rule-strong); }
.rlt-strip strong { display: block; font-family: var(--rlt-font-mono); font-weight: 500; font-size: 1.6rem; line-height: 1.1; }
.rlt-strip span { font-size: 0.86rem; color: var(--rlt-muted); }

/* Sections --------------------------------------------------------------- */
.rlt-section { padding: 64px 0; }
.rlt-section--rule { border-top: var(--rlt-line) solid var(--rlt-ink); }

.rlt-section__head {
	display: flex;
	align-items: flex-end;
	justify-content: space-between;
	gap: 24px;
	margin-bottom: 32px;
}

.rlt-section__head h2 { font-size: clamp(1.7rem, 1.3rem + 1.4vw, 2.4rem); }
.rlt-section__head p { margin: 10px 0 0; color: var(--rlt-ink-2); max-width: 58ch; }

/* Category blocks */
.rlt-cat { margin-top: 44px; }
.rlt-cat:first-child { margin-top: 0; }

.rlt-cat__head {
	display: flex;
	align-items: baseline;
	gap: 14px;
	padding-bottom: 12px;
	margin-bottom: 18px;
	border-bottom: var(--rlt-line) solid var(--rlt-ink);
}

.rlt-cat__head h2,
.rlt-cat__head h3 { display: flex; align-items: center; gap: 10px; margin: 0; font-size: 1.3rem; }
.rlt-cat__head h2 .rlt-icon,
.rlt-cat__head h3 .rlt-icon { color: var(--rlt-accent); width: 22px; height: 22px; }
.rlt-cat__head p { margin: 0; color: var(--rlt-muted); font-size: 0.92rem; }

.rlt-cat__count {
	margin-left: auto;
	font-family: var(--rlt-font-mono);
	font-size: 0.78rem;
	color: var(--rlt-muted);
	white-space: nowrap;
}

/* Tool cards */
.rlt-tools-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 18px;
}

.rlt-tool-card {
	position: relative;
	display: flex;
	flex-direction: column;
	gap: 10px;
	padding: 20px 20px 18px;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
	transition: transform 0.14s ease, box-shadow 0.14s ease;
}

.rlt-tool-card:hover { transform: translate(-2px, -2px); box-shadow: var(--rlt-shadow); }
.rlt-tool-card:focus-within { box-shadow: var(--rlt-shadow); }

.rlt-tool-card__top { display: flex; align-items: center; justify-content: space-between; }
.rlt-tool-card__top .rlt-icon { color: var(--rlt-muted); }

.rlt-tool-card h3 { font-size: 1.16rem; }

.rlt-tool-card h3 a { text-decoration: none; }
.rlt-tool-card h3 a::after { content: ""; position: absolute; inset: 0; }

.rlt-tool-card p { margin: 0; font-size: 0.92rem; color: var(--rlt-ink-2); flex: 1; }

.rlt-tool-card__formula {
	font-family: var(--rlt-font-mono);
	font-size: 0.8rem;
	color: var(--rlt-ink-2);
	padding: 6px 10px;
	background: var(--rlt-amber);
	border-left: 3px solid var(--rlt-amber-rule);
	border-radius: 0 3px 3px 0;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.rlt-tool-card__foot {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding-top: 10px;
	border-top: 1px dashed var(--rlt-rule-strong);
	font-size: 0.84rem;
	font-weight: 600;
}

.rlt-tool-card__foot .rlt-open { display: inline-flex; align-items: center; gap: 6px; color: var(--rlt-accent-ink); }
.rlt-tool-card__foot a { position: relative; z-index: 1; color: var(--rlt-muted); text-decoration: none; font-weight: 500; }
.rlt-tool-card__foot a:hover { color: var(--rlt-ink); text-decoration: underline; }

/* Principles */
.rlt-principles {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
}

.rlt-principle { padding: 28px; }
.rlt-principle + .rlt-principle { border-left: 1px dashed var(--rlt-rule-strong); }
.rlt-principle .rlt-icon { width: 28px; height: 28px; color: var(--rlt-accent); margin-bottom: 14px; }
.rlt-principle h3 { font-size: 1.15rem; margin-bottom: 8px; }
.rlt-principle p { margin: 0; font-size: 0.94rem; color: var(--rlt-ink-2); }

/* Guide list ("notebook entries") */
.rlt-entries { list-style: none; margin: 0; padding: 0; border-top: var(--rlt-line) solid var(--rlt-ink); counter-reset: entry; }

.rlt-entry {
	position: relative;
	display: grid;
	grid-template-columns: 64px minmax(0, 1fr) auto;
	gap: 20px;
	align-items: start;
	padding: 22px 0;
	border-bottom: 1px dashed var(--rlt-rule-strong);
}

.rlt-entry__num {
	font-family: var(--rlt-font-mono);
	font-size: 0.82rem;
	color: var(--rlt-accent-ink);
	padding-top: 4px;
}

.rlt-entry h3 { font-size: 1.22rem; margin-bottom: 6px; }
.rlt-entry h3 a { text-decoration: none; }
.rlt-entry h3 a::after { content: ""; position: absolute; inset: 0; }
.rlt-entry:hover h3 a { color: var(--rlt-accent-ink); }
.rlt-entry p { margin: 0; color: var(--rlt-ink-2); font-size: 0.95rem; max-width: 72ch; }

.rlt-entry__meta {
	font-family: var(--rlt-font-mono);
	font-size: 0.76rem;
	color: var(--rlt-muted);
	text-align: right;
	white-space: nowrap;
	padding-top: 4px;
}

.rlt-entry__meta a { position: relative; z-index: 1; display: block; margin-top: 6px; color: var(--rlt-ink-2); }

/* Embed CTA band */
.rlt-band {
	display: grid;
	grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
	gap: 40px;
	align-items: center;
	padding: 40px;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: 6px;
	background: var(--rlt-graphite);
	color: var(--rlt-screen);
}

.rlt-band h2 { color: #fff; font-size: clamp(1.6rem, 1.2rem + 1.2vw, 2.2rem); }
.rlt-band p { color: var(--rlt-screen-dim); margin: 12px 0 0; }
.rlt-band .rlt-eyebrow { color: var(--rlt-screen-dim); }

.rlt-band pre {
	margin: 0;
	padding: 18px;
	border: 1px solid var(--rlt-graphite-line);
	border-radius: var(--rlt-radius);
	background: #1a1d21;
	color: #d7d1c0;
	font-family: var(--rlt-font-mono);
	font-size: 0.8rem;
	line-height: 1.6;
	white-space: pre-wrap;
	word-break: break-all;
}

.rlt-band pre b { color: #f2a091; font-weight: 400; }

/* Calculator ------------------------------------------------------------- */
.rlt-calc {
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: 6px;
	background: var(--rlt-card);
	box-shadow: 6px 6px 0 var(--rlt-ink);
	overflow: hidden;
}

.rlt-calc__body {
	display: grid;
	grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
}

.rlt-calc__form {
	display: flex;
	flex-direction: column;
	gap: 18px;
	padding: 28px;
	min-width: 0;
}

.rlt-fields-row {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
	gap: 18px;
}

.rlt-fields-row[hidden],
.rlt-field[hidden],
.rlt-seg[hidden] { display: none; }

.rlt-field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }

.rlt-field__label {
	display: block;
	padding: 0;
	font-size: 0.74rem;
	font-weight: 700;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--rlt-ink-2);
}

.rlt-field__help { font-size: 0.8rem; color: var(--rlt-muted); line-height: 1.45; }

.rlt-input {
	display: flex;
	align-items: stretch;
	border: var(--rlt-line) solid var(--rlt-rule-strong);
	border-radius: var(--rlt-radius);
	background: #fff;
	transition: border-color 0.12s ease, box-shadow 0.12s ease;
	min-width: 0;
}

.rlt-input:hover { border-color: var(--rlt-ink-2); }
.rlt-input:focus-within { border-color: var(--rlt-accent); box-shadow: 0 0 0 3px var(--rlt-accent-wash); }

.rlt-input input,
.rlt-input textarea {
	flex: 1;
	min-width: 0;
	width: 100%;
	padding: 11px 12px;
	border: 0;
	background: transparent;
	font-family: var(--rlt-font-mono);
	font-size: 1.02rem;
	outline: none;
	border-radius: var(--rlt-radius);
}

.rlt-input input[type="text"]:not(.is-mono) { font-family: var(--rlt-font-body); font-size: 0.96rem; }
.rlt-input textarea { resize: vertical; line-height: 1.5; letter-spacing: 0.02em; min-height: 3.2em; }

.rlt-input input::-webkit-outer-spin-button,
.rlt-input input::-webkit-inner-spin-button { opacity: 0.4; }

.rlt-input select {
	flex: none;
	max-width: 52%;
	padding: 0 30px 0 12px;
	border: 0;
	border-left: 1px solid var(--rlt-rule);
	border-radius: 0 var(--rlt-radius) var(--rlt-radius) 0;
	background: var(--rlt-paper) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f2328' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 9px center / 14px;
	font-family: var(--rlt-font-mono);
	font-size: 0.9rem;
	cursor: pointer;
	-webkit-appearance: none;
	appearance: none;
	outline: none;
}

.rlt-input--select select {
	flex: 1;
	max-width: none;
	padding: 11px 34px 11px 12px;
	border-left: 0;
	border-radius: var(--rlt-radius);
	background-color: #fff;
	font-family: var(--rlt-font-body);
	font-size: 0.95rem;
}

.rlt-input__unit {
	display: flex;
	align-items: center;
	padding: 0 12px;
	border-left: 1px solid var(--rlt-rule);
	background: var(--rlt-paper);
	font-family: var(--rlt-font-mono);
	font-size: 0.9rem;
	color: var(--rlt-ink-2);
	border-radius: 0 var(--rlt-radius) var(--rlt-radius) 0;
}

/* Solved field */
.rlt-field.is-solved .rlt-input {
	border-style: dashed;
	border-color: var(--rlt-amber-rule);
	background: var(--rlt-amber);
}

.rlt-field.is-solved .rlt-input input { color: var(--rlt-accent-ink); font-weight: 500; cursor: default; }
.rlt-field.is-solved .rlt-input select { background-color: var(--rlt-amber); }

.rlt-field.is-solved .rlt-field__label::after {
	content: "= solved";
	margin-left: 8px;
	padding: 1px 6px;
	border-radius: 2px;
	background: var(--rlt-accent);
	color: #fff;
	font-family: var(--rlt-font-mono);
	font-weight: 500;
	letter-spacing: 0.04em;
	text-transform: none;
}

/* Segmented control */
.rlt-seg { margin: 0; padding: 0; border: 0; min-width: 0; }
.rlt-seg legend { margin-bottom: 6px; }

.rlt-seg__opts {
	display: inline-flex;
	flex-wrap: wrap;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	overflow: hidden;
	background: #fff;
}

.rlt-seg__opt { position: relative; }
.rlt-seg__opt + .rlt-seg__opt { border-left: 1px solid var(--rlt-rule-strong); }

.rlt-seg__opt input {
	position: absolute;
	opacity: 0;
	inset: 0;
	margin: 0;
	cursor: pointer;
}

.rlt-seg__opt span {
	display: block;
	padding: 8px 14px;
	font-size: 0.88rem;
	font-weight: 600;
	color: var(--rlt-ink-2);
	white-space: nowrap;
	transition: background-color 0.12s ease, color 0.12s ease;
}

.rlt-seg__opt:hover span { background: var(--rlt-paper-deep); }
.rlt-seg__opt input:checked + span { background: var(--rlt-ink); color: var(--rlt-paper); }
.rlt-seg__opt input:focus-visible + span { outline: 2px solid var(--rlt-accent); outline-offset: -4px; }

.rlt-field--check label { display: inline-flex; align-items: center; gap: 8px; font-weight: 500; cursor: pointer; }
.rlt-field--check input { width: 18px; height: 18px; accent-color: var(--rlt-accent); }

/* Presets */
.rlt-presets { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }

.rlt-preset {
	display: flex;
	flex-direction: column;
	align-items: flex-start;
	gap: 2px;
	padding: 10px 12px;
	border: 1px solid var(--rlt-rule-strong);
	border-radius: var(--rlt-radius);
	background: #fff;
	text-align: left;
	cursor: pointer;
}

.rlt-preset strong { font-size: 0.84rem; }
.rlt-preset span { font-family: var(--rlt-font-mono); font-size: 0.78rem; color: var(--rlt-muted); }
.rlt-preset:hover { border-color: var(--rlt-ink); background: var(--rlt-paper); }

/* Details */
.rlt-details { border: 1px dashed var(--rlt-rule-strong); border-radius: var(--rlt-radius); padding: 0 14px; background: var(--rlt-paper); }
.rlt-details summary { padding: 12px 0; font-weight: 600; font-size: 0.9rem; cursor: pointer; }
.rlt-details[open] { padding-bottom: 14px; }
.rlt-details .rlt-fields-row + .rlt-fields-row { margin-top: 14px; }

/* Readout */
.rlt-readout {
	display: flex;
	flex-direction: column;
	gap: 18px;
	padding: 24px;
	background: var(--rlt-graphite);
	color: var(--rlt-screen);
	min-width: 0;
}

.rlt-readout__screen {
	position: relative;
	padding: 18px 18px 16px;
	border: 1px solid var(--rlt-graphite-line);
	border-radius: var(--rlt-radius);
	background:
		linear-gradient(rgba(236, 230, 214, 0.035) 1px, transparent 1px) 0 0 / 100% 6px,
		#1a1d21;
}

.rlt-readout__screen::before {
	content: "";
	position: absolute;
	top: 12px; right: 12px;
	width: 8px; height: 8px;
	border-radius: 50%;
	background: var(--rlt-ok);
	box-shadow: 0 0 0 3px rgba(63, 125, 88, 0.25);
}

.has-error .rlt-readout__screen::before { background: var(--rlt-accent); box-shadow: 0 0 0 3px rgba(217, 65, 43, 0.3); }

.rlt-readout__label {
	margin: 0 0 6px;
	padding-right: 20px;
	font-family: var(--rlt-font-mono);
	font-size: 0.72rem;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: #f2a091;
}

.rlt-readout__value {
	display: flex;
	flex-wrap: wrap;
	align-items: baseline;
	gap: 4px 10px;
	margin: 0;
	font-family: var(--rlt-font-mono);
	line-height: 1.1;
}

.rlt-readout__value output {
	font-size: clamp(2rem, 1.5rem + 1.6vw, 2.75rem);
	font-weight: 500;
	color: #fff;
	letter-spacing: -0.02em;
	word-break: break-word;
}

.rlt-readout__unit { font-size: 1.1rem; color: var(--rlt-screen-dim); }

.rlt-readout__error {
	margin: 12px 0 0;
	padding: 10px 12px;
	border-left: 3px solid var(--rlt-accent);
	background: rgba(217, 65, 43, 0.12);
	color: #f6c4ba;
	font-size: 0.88rem;
	line-height: 1.45;
}

.rlt-readout__error[hidden] { display: none; }

.rlt-readout__rows {
	display: grid;
	grid-template-columns: auto minmax(0, 1fr);
	margin: 0;
	font-size: 0.86rem;
}

.rlt-readout__rows dt,
.rlt-readout__rows dd {
	padding: 8px 0;
	border-top: 1px dashed var(--rlt-graphite-line);
}

.rlt-readout__rows dt { color: var(--rlt-screen-dim); padding-right: 16px; }

.rlt-readout__rows dd {
	margin: 0;
	text-align: right;
	font-family: var(--rlt-font-mono);
	color: var(--rlt-screen);
	overflow-wrap: anywhere;
}

.rlt-readout__steps {
	padding: 12px 14px;
	border-radius: var(--rlt-radius);
	background: rgba(236, 230, 214, 0.05);
	font-size: 0.8rem;
}

.rlt-readout__steps[hidden] { display: none; }

.rlt-readout__steps-title {
	margin: 0 0 6px;
	font-family: var(--rlt-font-mono);
	font-size: 0.68rem;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--rlt-screen-dim);
}

.rlt-readout__steps ol { margin: 0; padding-left: 18px; font-family: var(--rlt-font-mono); color: #d7d1c0; line-height: 1.55; }
.rlt-readout__steps li + li { margin-top: 4px; }

.rlt-calc__actions {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
	margin-top: auto;
	padding-top: 4px;
}

.rlt-calc__table { padding: 24px 28px 28px; border-top: var(--rlt-line) solid var(--rlt-ink); background: var(--rlt-card); }
.rlt-calc__table[hidden] { display: none; }

/* Data tables */
.rlt-table-wrap { overflow-x: auto; }

.rlt-table {
	width: 100%;
	border-collapse: collapse;
	font-size: 0.9rem;
}

.rlt-table caption {
	padding-bottom: 12px;
	text-align: left;
	font-family: var(--rlt-font-head);
	font-weight: 600;
	font-size: 1.02rem;
}

.rlt-table th {
	padding: 9px 12px;
	border-bottom: var(--rlt-line) solid var(--rlt-ink);
	text-align: left;
	font-size: 0.72rem;
	font-weight: 700;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--rlt-ink-2);
	white-space: nowrap;
}

.rlt-table td {
	padding: 9px 12px;
	border-bottom: 1px dashed var(--rlt-rule);
	font-family: var(--rlt-font-mono);
	font-size: 0.86rem;
	vertical-align: top;
}

.rlt-table tbody tr:nth-child(even) td { background: rgba(239, 233, 220, 0.5); }
.rlt-table tbody tr:hover td { background: var(--rlt-amber); }
.rlt-table td.is-flag { color: var(--rlt-accent-ink); font-weight: 500; }
.rlt-table td.is-check::before { content: ""; display: inline-block; width: 14px; height: 14px; border: 1.5px solid var(--rlt-rule-strong); border-radius: 2px; vertical-align: middle; }

/* Tool page -------------------------------------------------------------- */
.rlt-toolhead { padding: 36px 0 30px; }

.rlt-toolhead__kicker {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 10px;
	margin-bottom: 14px;
	font-family: var(--rlt-font-mono);
	font-size: 0.78rem;
	color: var(--rlt-muted);
}

.rlt-toolhead__kicker a { color: inherit; }
.rlt-toolhead h1 { font-size: clamp(1.9rem, 1.3rem + 2.3vw, 3rem); max-width: 24ch; }

.rlt-toolhead__jump {
	display: flex;
	flex-wrap: wrap;
	gap: 6px 18px;
	margin-top: 18px;
	font-size: 0.88rem;
}

.rlt-toolhead__jump a { color: var(--rlt-ink-2); text-decoration: none; border-bottom: 1px solid var(--rlt-rule-strong); }
.rlt-toolhead__jump a:hover { color: var(--rlt-accent-ink); border-color: var(--rlt-accent); }

.rlt-tool-layout {
	display: grid;
	grid-template-columns: minmax(0, 1fr) 340px;
	gap: 48px;
	margin-top: 56px;
	align-items: start;
}

.rlt-sidebar { display: flex; flex-direction: column; gap: 20px; position: sticky; top: calc(var(--rlt-header-h) + 24px); }
.admin-bar .rlt-sidebar { top: calc(var(--rlt-header-h) + 56px); }

.rlt-box {
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
	padding: 20px;
}

.rlt-box__title {
	display: flex;
	align-items: center;
	gap: 8px;
	margin: 0 0 12px;
	font-family: var(--rlt-font-head);
	font-size: 1.02rem;
	font-weight: 600;
}

.rlt-box__title .rlt-icon { color: var(--rlt-accent); }
.rlt-box p { font-size: 0.9rem; color: var(--rlt-ink-2); }
.rlt-box ul { list-style: none; margin: 0; padding: 0; }
.rlt-box li + li { border-top: 1px dashed var(--rlt-rule); }
.rlt-box li a { display: flex; align-items: center; gap: 10px; padding: 9px 0; text-decoration: none; font-weight: 500; font-size: 0.93rem; }
.rlt-box li a:hover { color: var(--rlt-accent-ink); }

.rlt-box--guide { background: var(--rlt-graphite); color: var(--rlt-screen); }
.rlt-box--guide .rlt-box__title { color: #fff; }
.rlt-box--guide p { color: var(--rlt-screen-dim); }
.rlt-box--guide .rlt-btn { width: 100%; }

.rlt-codebox {
	width: 100%;
	min-height: 120px;
	padding: 12px;
	border: 1px solid var(--rlt-rule-strong);
	border-radius: var(--rlt-radius);
	background: var(--rlt-paper);
	font-family: var(--rlt-font-mono);
	font-size: 0.74rem;
	line-height: 1.55;
	resize: vertical;
	color: var(--rlt-ink-2);
}

.rlt-codebox--cite { min-height: 90px; font-family: var(--rlt-font-body); font-size: 0.82rem; }
.rlt-box .rlt-btn { margin-top: 10px; padding: 8px 12px; font-size: 0.84rem; }

/* Notebook sections inside the tool page */
.rlt-sheet { display: flex; flex-direction: column; gap: 40px; }

.rlt-sheet__block h2 {
	display: flex;
	align-items: baseline;
	gap: 12px;
	font-size: 1.5rem;
	margin-bottom: 16px;
	padding-bottom: 10px;
	border-bottom: var(--rlt-line) solid var(--rlt-ink);
}

.rlt-sheet__block h2 small {
	font-family: var(--rlt-font-mono);
	font-size: 0.78rem;
	font-weight: 400;
	color: var(--rlt-accent-ink);
	letter-spacing: 0.04em;
}

.rlt-formula {
	position: relative;
	padding: 22px 24px;
	border: 1px solid var(--rlt-amber-rule);
	border-left: 4px solid var(--rlt-accent);
	border-radius: 0 var(--rlt-radius) var(--rlt-radius) 0;
	background: var(--rlt-amber);
}

.rlt-formula p:last-child { margin-bottom: 0; }

.rlt-formula code {
	display: inline-block;
	padding: 2px 0;
	background: none;
	font-size: 1.04rem;
	color: var(--rlt-ink);
}

.rlt-formula p:first-child code { font-size: 1.2rem; }

.rlt-example {
	padding: 22px 24px;
	border: 1px dashed var(--rlt-rule-strong);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
}

.rlt-example p:last-child { margin-bottom: 0; }

.rlt-sources { list-style: none; margin: 0; padding: 0; counter-reset: src; }

.rlt-sources li {
	counter-increment: src;
	display: grid;
	grid-template-columns: 34px minmax(0, 1fr);
	padding: 10px 0;
	border-bottom: 1px dashed var(--rlt-rule);
	font-size: 0.93rem;
}

.rlt-sources li::before {
	content: "[" counter(src) "]";
	font-family: var(--rlt-font-mono);
	font-size: 0.8rem;
	color: var(--rlt-accent-ink);
	padding-top: 2px;
}

.rlt-sources a { text-decoration-color: var(--rlt-rule-strong); text-underline-offset: 3px; overflow-wrap: anywhere; }
.rlt-sources a:hover { color: var(--rlt-accent-ink); text-decoration-color: var(--rlt-accent); }

/* Prose ------------------------------------------------------------------ */
.rlt-prose { font-size: 1.04rem; line-height: 1.75; color: var(--rlt-ink); max-width: 72ch; counter-reset: sect; }

.rlt-prose > * + * { margin-top: 1.1em; }
.rlt-prose p { margin: 0; }
.rlt-prose > p:first-child { margin-top: 0; }

.rlt-prose h2 {
	counter-increment: sect;
	margin-top: 2.4em;
	margin-bottom: 0.2em;
	font-size: 1.6rem;
}

.rlt-prose h2::before {
	content: "§" counter(sect);
	display: block;
	margin-bottom: 6px;
	font-family: var(--rlt-font-mono);
	font-size: 0.78rem;
	font-weight: 400;
	letter-spacing: 0.06em;
	color: var(--rlt-accent-ink);
}

.rlt-prose--plain h2::before { content: none; }

.rlt-prose .rlt-updated {
	font-family: var(--rlt-font-mono);
	font-size: 0.8rem;
	letter-spacing: 0.04em;
	text-transform: uppercase;
	color: var(--rlt-muted);
}

.rlt-prose .rlt-updated + * { margin-top: 1.6em; }

.rlt-prose h3 { margin-top: 1.8em; font-size: 1.22rem; }
.rlt-prose a { color: var(--rlt-blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.rlt-prose a:hover { color: var(--rlt-accent-ink); }
.rlt-prose ul, .rlt-prose ol { padding-left: 1.4em; }
.rlt-prose li + li { margin-top: 0.4em; }
.rlt-prose li::marker { color: var(--rlt-accent-ink); font-family: var(--rlt-font-mono); }

.rlt-prose code {
	padding: 1px 6px;
	border-radius: 3px;
	background: var(--rlt-paper-deep);
	font-size: 0.9em;
}

.rlt-prose strong { font-weight: 700; }

.rlt-prose .rlt-eq {
	margin: 1.4em 0;
	padding: 18px 22px;
	border: 1px solid var(--rlt-amber-rule);
	border-left: 4px solid var(--rlt-accent);
	border-radius: 0 var(--rlt-radius) var(--rlt-radius) 0;
	background: var(--rlt-amber);
	font-family: var(--rlt-font-mono);
	font-size: 1.08rem;
	overflow-x: auto;
}

.rlt-prose .rlt-note {
	padding: 16px 20px;
	border: 1px dashed var(--rlt-rule-strong);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
	font-size: 0.96rem;
}

.rlt-prose .rlt-note strong:first-child { display: block; margin-bottom: 4px; font-family: var(--rlt-font-head); }

.rlt-prose .rlt-worked {
	padding: 18px 22px;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
}

.rlt-prose .rlt-worked > :first-child { margin-top: 0; }

.rlt-prose table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.rlt-prose th { padding: 8px 12px; border-bottom: var(--rlt-line) solid var(--rlt-ink); text-align: left; font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; }
.rlt-prose td { padding: 8px 12px; border-bottom: 1px dashed var(--rlt-rule); }
.rlt-prose td code { background: none; padding: 0; }
.rlt-prose .rlt-table-scroll { overflow-x: auto; }

.rlt-prose blockquote { margin: 1.4em 0; padding-left: 20px; border-left: 3px solid var(--rlt-accent); color: var(--rlt-ink-2); }

/* Guide page ------------------------------------------------------------- */
.rlt-guide-layout {
	display: grid;
	grid-template-columns: minmax(0, 1fr) 300px;
	gap: 56px;
	align-items: start;
}

.rlt-notebook {
	position: relative;
	padding: 40px 48px 48px 64px;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
}

.rlt-notebook::before,
.rlt-notebook::after {
	content: "";
	position: absolute;
	top: 0; bottom: 0;
	width: 1px;
	background: var(--rlt-accent);
	opacity: 0.55;
}

.rlt-notebook::before { left: 36px; }
.rlt-notebook::after { left: 40px; }

.rlt-refs { margin-top: 48px; padding-top: 20px; border-top: var(--rlt-line) solid var(--rlt-ink); }
.rlt-refs h2 { font-size: 1.25rem; margin-bottom: 8px; }

.rlt-toc { font-size: 0.9rem; }
.rlt-toc ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.rlt-toc li { counter-increment: toc; }

.rlt-toc a {
	display: grid;
	grid-template-columns: 30px minmax(0, 1fr);
	padding: 7px 0;
	border-top: 1px dashed var(--rlt-rule);
	text-decoration: none;
	color: var(--rlt-ink-2);
}

.rlt-toc a::before { content: "§" counter(toc); font-family: var(--rlt-font-mono); font-size: 0.78rem; color: var(--rlt-muted); padding-top: 2px; }
.rlt-toc a:hover, .rlt-toc a.is-active { color: var(--rlt-ink); }
.rlt-toc a.is-active::before { color: var(--rlt-accent-ink); }

/* Generic pages ---------------------------------------------------------- */
.rlt-page-layout { max-width: 860px; }
.rlt-page-layout .rlt-notebook { margin-top: 8px; }

/* Archives --------------------------------------------------------------- */
.rlt-index-tools { display: flex; align-items: center; gap: 16px; margin-top: 28px; }
.rlt-index-tools .rlt-finder { max-width: 460px; box-shadow: 3px 3px 0 var(--rlt-ink); }

.rlt-empty {
	padding: 40px;
	border: 1px dashed var(--rlt-rule-strong);
	border-radius: var(--rlt-radius);
	background: var(--rlt-card);
	text-align: center;
	color: var(--rlt-muted);
}

/* Search results */
.rlt-results { list-style: none; margin: 0; padding: 0; border-top: var(--rlt-line) solid var(--rlt-ink); }
.rlt-results li { padding: 18px 0; border-bottom: 1px dashed var(--rlt-rule-strong); }
.rlt-results h2 { font-size: 1.2rem; }
.rlt-results h2 a { text-decoration: none; }
.rlt-results h2 a:hover { color: var(--rlt-accent-ink); }
.rlt-results p { margin: 6px 0 0; color: var(--rlt-ink-2); font-size: 0.95rem; }
.rlt-results .rlt-code { margin-right: 8px; vertical-align: 2px; }

.rlt-searchform { display: flex; gap: 10px; max-width: 560px; margin-top: 20px; }
.rlt-searchform .rlt-finder { max-width: none; }

/* 404 */
.rlt-404 { padding: 72px 0 24px; }
.rlt-404__code { font-family: var(--rlt-font-mono); font-size: clamp(4rem, 3rem + 6vw, 8rem); line-height: 1; color: var(--rlt-accent); letter-spacing: -0.04em; }

/* Contact form ----------------------------------------------------------- */
.rlt-form { display: grid; gap: 16px; margin-top: 1.4em; }
.rlt-form .rlt-fields-row { gap: 16px; }
.rlt-form .rlt-input textarea { font-family: var(--rlt-font-body); font-size: 0.98rem; letter-spacing: 0; }
.rlt-form__hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.rlt-notice {
	padding: 14px 18px;
	border-radius: var(--rlt-radius);
	border-left: 4px solid var(--rlt-ok);
	background: #e7f1ea;
	font-weight: 500;
}

.rlt-notice--error { border-color: var(--rlt-accent); background: var(--rlt-accent-wash); }

/* Sponsor block */
.rlt-sponsor-card {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 20px;
	padding: 22px 24px;
	border: var(--rlt-line) solid var(--rlt-ink);
	border-radius: var(--rlt-radius);
	background: var(--rlt-paper);
}

.rlt-sponsor-card p { margin: 0; }
.rlt-sponsor-card strong { font-family: var(--rlt-font-head); font-size: 1.2rem; display: block; }
.rlt-sponsor-card small { color: var(--rlt-muted); }
.rlt-prose .rlt-sponsor-card a.rlt-btn { color: var(--rlt-ink); text-decoration: none; }

/* Footer ----------------------------------------------------------------- */
.rlt-footer {
	background: var(--rlt-graphite);
	color: var(--rlt-screen);
	border-top: var(--rlt-line) solid var(--rlt-ink);
}

.rlt-footer a { color: var(--rlt-screen); text-decoration: none; }
.rlt-footer a:hover { color: #fff; text-decoration: underline; text-decoration-color: var(--rlt-accent); text-underline-offset: 3px; }

.rlt-footer__top {
	display: grid;
	grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
	gap: 40px;
	padding: 56px 0 44px;
}

.rlt-footer .rlt-brand__tag { color: var(--rlt-screen-dim); }
.rlt-footer__about { margin: 16px 0 0; color: var(--rlt-screen-dim); font-size: 0.92rem; max-width: 40ch; }

.rlt-footer h2 {
	margin-bottom: 14px;
	font-family: var(--rlt-font-mono);
	font-size: 0.72rem;
	font-weight: 500;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--rlt-screen-dim);
}

.rlt-footer ul { list-style: none; margin: 0; padding: 0; font-size: 0.92rem; }
.rlt-footer li + li { margin-top: 8px; }

.rlt-footer__bottom {
	display: flex;
	flex-wrap: wrap;
	align-items: flex-start;
	justify-content: space-between;
	gap: 16px 32px;
	padding: 22px 0 28px;
	border-top: 1px solid var(--rlt-graphite-line);
	font-size: 0.82rem;
	color: var(--rlt-screen-dim);
}

.rlt-footer__bottom p { margin: 0; max-width: 70ch; }
.rlt-footer__sponsor { color: var(--rlt-screen); }
.rlt-footer__sponsor a { text-decoration: underline; text-decoration-color: rgba(236, 230, 214, 0.35); text-underline-offset: 3px; }

/* Embed view ------------------------------------------------------------- */
body.rlt-embed { background: var(--rlt-paper); padding: 12px; }
.rlt-embed .rlt-calc { box-shadow: none; }

.rlt-embed__foot {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	margin-top: 10px;
	font-size: 0.8rem;
	color: var(--rlt-muted);
}

.rlt-embed__foot a { color: var(--rlt-ink); font-weight: 600; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; }
.rlt-embed__foot .rlt-mark { width: 20px; height: 20px; }

/* Responsive ------------------------------------------------------------- */
@media (max-width: 1100px) {
	.rlt-tools-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
	.rlt-tool-layout { grid-template-columns: minmax(0, 1fr) 300px; gap: 36px; }
	.rlt-footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 1023px) {
	.rlt-burger { display: inline-flex; }
	.rlt-header__cta { display: none; }

	.rlt-nav {
		position: fixed;
		left: 0; right: 0; bottom: 0;
		top: var(--rlt-nav-top, var(--rlt-header-h));
		overflow-y: auto;
		overscroll-behavior: contain;
		background: var(--rlt-paper);
		border-top: var(--rlt-line) solid var(--rlt-ink);
		padding: 12px 24px 40px;
		transform: translateX(100%);
		visibility: hidden;
		transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0s linear 0.3s;
	}

	.admin-bar .rlt-nav { top: var(--rlt-nav-top, calc(var(--rlt-header-h) + 46px)); }
	.rlt-drawer-open { overflow: hidden; }
	.rlt-drawer-open .rlt-nav {
		transform: none;
		visibility: visible;
		transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0s;
	}

	.rlt-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
	.rlt-nav__item { border-bottom: 1px dashed var(--rlt-rule-strong); }

	.rlt-nav__trigger,
	.rlt-nav__link {
		width: 100%;
		justify-content: space-between;
		padding: 16px 0;
		font-size: 1.1rem;
		border-radius: 0;
	}

	.rlt-nav__trigger:hover,
	.rlt-nav__link:hover,
	.rlt-nav__trigger[aria-expanded="true"] { background: none; }

	.rlt-nav__item.is-current > .rlt-nav__trigger::after,
	.rlt-nav__item.is-current > .rlt-nav__link::after { left: 0; right: auto; width: 24px; bottom: 8px; }

	.rlt-panel { position: static; border: 0; box-shadow: none; background: transparent; }
	.rlt-panel__inner { padding: 0 0 18px; }
	.rlt-panel__head { flex-direction: column; align-items: stretch; }
	.rlt-finder { max-width: none; }
	.rlt-panel__cols,
	.rlt-panel__inner--guides,
	.rlt-panel__inner--guides .rlt-panel__cols { grid-template-columns: minmax(0, 1fr); gap: 20px; }

	.rlt-hero__grid { grid-template-columns: minmax(0, 1fr); gap: 44px; }
	.rlt-tool-layout,
	.rlt-guide-layout { grid-template-columns: minmax(0, 1fr); }
	.rlt-sidebar { position: static; }
	.rlt-calc__body { grid-template-columns: minmax(0, 1fr); }
	.rlt-band { grid-template-columns: minmax(0, 1fr); padding: 28px; }
}

@media (max-width: 760px) {
	:root { --rlt-header-h: 60px; }
	.rlt-wrap { padding: 0 18px; }
	.rlt-brand__tag { display: none; }
	.rlt-hero { padding: 40px 0 40px; }
	.rlt-tools-grid,
	.rlt-principles { grid-template-columns: minmax(0, 1fr); }
	.rlt-tool-card__formula { white-space: normal; overflow-wrap: anywhere; }
	.rlt-principle + .rlt-principle { border-left: 0; border-top: 1px dashed var(--rlt-rule-strong); }
	.rlt-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
	.rlt-strip > div:nth-child(3) { border-left: 0; }
	.rlt-strip > div:nth-child(n + 3) { border-top: 1px dashed var(--rlt-rule-strong); }
	.rlt-section { padding: 48px 0; }
	.rlt-section__head { flex-direction: column; align-items: flex-start; }
	.rlt-cat__head { flex-wrap: wrap; }
	.rlt-cat__head p { flex-basis: 100%; order: 3; }
	.rlt-entry { grid-template-columns: minmax(0, 1fr); gap: 6px; }
	.rlt-entry__meta { text-align: left; }
	.rlt-calc__form, .rlt-readout { padding: 20px; }
	.rlt-calc__table { padding: 20px; }
	.rlt-calc { box-shadow: 4px 4px 0 var(--rlt-ink); }
	.rlt-notebook { padding: 28px 20px 32px 40px; }
	.rlt-notebook::before { left: 20px; }
	.rlt-notebook::after { left: 24px; }
	.rlt-presets { grid-template-columns: repeat(2, minmax(0, 1fr)); }
	.rlt-footer__top { grid-template-columns: minmax(0, 1fr); gap: 28px; }
	.rlt-sponsor-card { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
	*, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

/* Print ------------------------------------------------------------------ */
@media print {
	body { background: #fff; font-size: 11pt; }
	.rlt-header, .rlt-footer, .rlt-sidebar, .rlt-calc__actions, .rlt-crumbs, .rlt-toolhead__jump, .skip-link { display: none !important; }
	.rlt-calc, .rlt-notebook, .rlt-box { box-shadow: none; }
	.rlt-readout { background: #fff; color: #000; border-left: 1px solid #000; }
	.rlt-readout__screen { background: #fff; }
	.rlt-readout__value output, .rlt-readout__rows dd { color: #000; }
	.rlt-tool-layout { display: block; }

	html.rlt-printing body > *:not(#rlt-print-sheet) { display: none !important; }
	#rlt-print-sheet { display: none; }
	html.rlt-printing #rlt-print-sheet { display: block; font-family: var(--rlt-font-body); color: #000; }
	#rlt-print-sheet h1 { font-size: 18pt; margin-bottom: 10pt; }
	#rlt-print-sheet dl { display: grid; grid-template-columns: 34mm 1fr 34mm 1fr; gap: 4pt 10pt; margin: 0 0 14pt; font-size: 10pt; }
	#rlt-print-sheet dt { font-weight: 700; }
	#rlt-print-sheet dd { margin: 0; border-bottom: 0.5pt solid #999; min-height: 12pt; }
	#rlt-print-sheet .rlt-table td, #rlt-print-sheet .rlt-table th { border-bottom: 0.5pt solid #999; background: none !important; padding: 6pt 8pt; }
	#rlt-print-sheet p { margin-top: 14pt; font-size: 8pt; color: #555; }
}

@media screen {
	#rlt-print-sheet { display: none; }
}