:root {
	/* OKLCH color tokens — neutrals tinted warm (hue ~70) toward the paper base. */
	--bg:     oklch(0.98 0.005 70);
	--ink:    oklch(0.22 0.02 70);
	--muted:  oklch(0.50 0.01 70);
	--line:   oklch(0.85 0.01 70);
	--accent: oklch(0.55 0.22 25);       /* stamp-red */
	--accent-ink: oklch(0.38 0.18 25);   /* darker for hover/underline */
	--surface: oklch(1 0 0);             /* pure white for credential boxes to contrast paper */

	--font-display: 'Young Serif', 'Iowan Old Style', 'Palatino Linotype', Palatino, serif;
	--font-body:    'Atkinson Hyperlegible', 'Charter', 'Georgia', serif;

	/* Type scale: 1.25 ratio, fixed rem (product UI, not marketing).
	   Masthead is tuned to fit above the fold on a 720-line
	   laptop without sacrificing the newspaper grammar. */
	--t-xs:  0.8125rem;  /* 13px */
	--t-s:   0.9375rem;  /* 15px */
	--t-m:   1.0625rem;  /* 17px */
	--t-l:   1.1875rem;  /* 19px */
	--t-xl:  1.375rem;   /* 22px */
	--t-2xl: 2rem;       /* 32px */
	--t-3xl: 3rem;       /* 48px — masthead */
}
* { box-sizing: border-box; }
html, body {
	margin: 0;
	padding: 0;
	background: var(--bg);
	color: var(--ink);
	font-family: var(--font-body);
	font-size: var(--t-m);
	line-height: 1.45;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}
/* Body is a flex column so the footer can stick to the viewport
   bottom on short pages (see `footer { margin-top: auto; }` below).
   Without this, the footer floats mid-page when the content
   column is shorter than the viewport. */
html { min-height: 100%; }
body { min-height: 100vh; display: flex; flex-direction: column; }
/* Body links are ink with an accent underline. Reserving stamp-red
   for the drop-cap, primary button, and credential callout keeps
   the accent color heroic — not stippled across every paragraph. */
a {
	color: var(--ink);
	text-decoration: underline;
	text-decoration-color: var(--accent);
	text-decoration-thickness: 1.5px;
	text-underline-offset: 3px;
}
a:hover {
	color: var(--accent-ink);
	text-decoration-color: var(--accent-ink);
}
code {
	font-family: 'JetBrains Mono', 'Menlo', 'Consolas', monospace;
	font-size: 0.95em;
	/* Pure white fill against warm paper — same treatment
	   as <pre> and credential boxes. Reads as "data chit
	   on stationery" rather than a bordered same-color
	   region that blurs into prose. */
	background: var(--surface);
	padding: 0 0.25em;
	border: 1px solid var(--line);
	border-radius: 2px;
}
pre {
	font-family: 'JetBrains Mono', 'Menlo', 'Consolas', monospace;
	font-size: 0.9em;
	background: var(--surface);
	color: var(--ink);
	border: 1px solid var(--line);
	padding: 1rem 1.25rem;
	border-radius: 2px;
	overflow-x: auto;
	white-space: pre-wrap;
	word-break: break-all;
	line-height: 1.5;
}
pre code { background: none; border: none; padding: 0; }

/* Top-of-page nav — subtle home link so every page can
   return to the marketing landing with one click. Lives
   above the masthead; typography-sized so it doesn't
   visually compete with the section mastheads below. */
.topnav {
	font-family: var(--font-body);
	font-size: var(--t-xs);
	text-transform: uppercase;
	letter-spacing: 0.12em;
	color: var(--muted);
	margin-bottom: 1.5rem;
	padding-bottom: 0.5rem;
	border-bottom: 1px solid var(--line);
}
.topnav-home {
	color: var(--muted);
	text-decoration: none;
	font-weight: 700;
}
.topnav-home:hover {
	color: var(--accent);
}

/* Persistent header navbar (Chainlink #353). Rendered on
   every authenticated page (Account / Domains / Deliverability
   / Sign out) plus a right-aligned user chip. Replaces the
   ad-hoc "← Back to X" breadcrumbs that used to live in
   each authenticated sub-page. Logged-out pages pass
   NavState{} and render no navbar. */
.appnav {
	display: flex;
	align-items: center;
	gap: 1.25rem;
	flex-wrap: wrap;
	margin: 0 0 1.5rem;
	padding-bottom: 0.65rem;
	border-bottom: 1px solid var(--line);
	font-family: var(--font-body);
	font-size: var(--t-s);
}
.appnav-list {
	display: flex;
	flex-wrap: wrap;
	gap: 1.1rem;
	margin: 0;
	padding: 0;
	list-style: none;
	align-items: baseline;
}
.appnav-list a {
	color: var(--ink);
	text-decoration: none;
	padding-bottom: 2px;
	border-bottom: 2px solid transparent;
	font-weight: 400;
	transition: color 120ms ease, border-color 120ms ease;
}
.appnav-list a:hover {
	color: var(--accent-ink);
	border-bottom-color: var(--accent-ink);
}
/* Active item — bold text + a 2px accent underline. The
   contract is the aria-current attribute; the visual is
   styled off it so screen readers and sighted users see
   the same affordance. */
.appnav-list a[aria-current="page"] {
	font-weight: 700;
	border-bottom-color: var(--accent);
	color: var(--ink);
}
/* User chip — right-aligned handle/DID with a hairline
   left-border to read as "session metadata" rather than
   another nav item. margin-left:auto pushes it to the
   far right of the flex row. */
.appnav-user {
	margin-left: auto;
	padding-left: 1rem;
	border-left: 1px solid var(--line);
	color: var(--muted);
	font-size: var(--t-xs);
	font-family: 'JetBrains Mono', 'Menlo', 'Consolas', monospace;
	word-break: break-all;
	max-width: 22rem;
}
/* Mobile (<480px) — nav items stay on one line; the user
   chip is hidden to keep the header a single clean row. */
@media (max-width: 480px) {
	.appnav {
		gap: 0.5rem;
	}
	.appnav-list {
		gap: 0.75rem 1rem;
	}
	.appnav-user {
		display: none;
	}
}

.page {
	max-width: 680px;
	width: 100%;
	margin: 0 auto;
	padding: 2rem 2rem 2.5rem;
	/* Flex column so the footer can grow to fill vertical space
	   via `margin-top: auto`, pinning it to the viewport bottom
	   on short pages. */
	flex: 1 0 auto;
	display: flex;
	flex-direction: column;
}

/* Masthead — deliberately large, newspaper-style. The leading 'A'
   of "Atmosphere" gets the accent color; the rest is ink. */
.masthead {
	font-family: var(--font-display);
	font-size: var(--t-3xl);
	line-height: 1;
	letter-spacing: -0.03em;
	margin: 0 0 0.5rem;
	color: var(--ink);
}
.masthead .drop {
	color: var(--accent);
}
/* Sub-page masthead — smaller, no drop-cap. The drop-cap is reserved
   for the landing's brand mark; pages like /terms /privacy /aup /about
   are reference docs that cede visual authority to the landing. */
.masthead-sub {
	font-size: var(--t-2xl);
	margin-bottom: 0.25rem;
}
/* Effective-date marginalia — the typographic convention for legal
   documents. Sits directly under the title in small-caps, before
   the lede. Replaces the awkward "Effective X. Lorem ipsum..."
   sentence-opener pattern used in the first draft. */
.effective {
	font-family: var(--font-body);
	font-size: var(--t-xs);
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.12em;
	color: var(--muted);
	margin: 0 0 1.25rem;
}
.lede {
	font-family: var(--font-body);
	font-style: italic;
	font-size: var(--t-l);
	color: var(--muted);
	line-height: 1.4;
	margin: 0 0 1rem;
	max-width: 32em;
}

/* Section heading — Young Serif, smaller than masthead, with a
   hairline rule above. Evokes a typeset page break. */
.section {
	margin-top: 1.75rem;
	padding-top: 1rem;
	border-top: 1px solid var(--line);
}
.section h2 {
	font-family: var(--font-display);
	font-size: var(--t-xl);
	font-weight: 400;
	letter-spacing: -0.01em;
	margin: 0 0 0.35rem;
}
.section p {
	margin: 0.35rem 0 0.6rem;
}
.section-lede {
	font-size: var(--t-s);
	color: var(--muted);
	margin: 0 0 1rem;
	max-width: 36em;
}

/* Step number — small-caps marginalia, NOT a boxed card number. */
.step-marker {
	display: block;
	font-family: var(--font-body);
	font-size: var(--t-xs);
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.12em;
	color: var(--muted);
	margin-bottom: 0.25rem;
}

/* Form — boxed fields on white surface. Earlier iterations used
   hairline-underline inputs (no box, just a bottom border), but
   those collided visually with the section dividers and readers
   couldn't tell what was input vs. structure. A subtle surface
   fill + 1px frame makes "this is a typeable field" unambiguous
   without dragging the page toward a generic webform aesthetic. */
label {
	display: block;
	font-size: var(--t-s);
	font-weight: 700;
	margin-top: 1rem;
	margin-bottom: 0.25rem;
}
label + small {
	display: block;
	color: var(--muted);
	font-size: var(--t-xs);
	margin-bottom: 0.5rem;
}
input[type=text],
input[type=email],
textarea {
	display: block;
	width: 100%;
	font-family: inherit;
	font-size: var(--t-m);
	color: var(--ink);
	background: var(--surface);
	border: 1px solid var(--line);
	border-radius: 2px;
	padding: 0.6rem 0.75rem;
	margin-bottom: 0.5rem;
	outline: none;
	transition: border-color 120ms ease, box-shadow 120ms ease;
}
input[type=text]:focus,
input[type=email]:focus,
textarea:focus {
	border-color: var(--ink);
	box-shadow: inset 0 -2px 0 0 var(--accent);
}
.handle-input-wrapper {
	position: relative;
}
.handle-input-wrapper input[type=text] {
	padding-left: 1.75rem;
}
.handle-input-wrapper::before {
	content: "@";
	position: absolute;
	left: 0.75rem;
	top: 0.6rem;
	font-family: 'JetBrains Mono', 'Menlo', monospace;
	font-size: var(--t-m);
	color: var(--muted);
	pointer-events: none;
	z-index: 1;
}
.handle-suggestions {
	position: absolute;
	left: 0;
	right: 0;
	bottom: 100%;
	background: var(--ink);
	color: var(--bg);
	border-radius: 2px 2px 0 0;
	z-index: 10;
	max-height: 260px;
	overflow-y: auto;
	box-shadow: 0 -4px 16px rgba(0,0,0,0.15);
}
.handle-suggestion {
	display: flex;
	align-items: center;
	gap: 0.6rem;
	padding: 0.5rem 0.75rem;
	cursor: pointer;
	transition: background 0.1s;
}
.handle-suggestion:hover,
.handle-suggestion.active {
	background: oklch(0.30 0.02 70);
}
.suggestion-avatar {
	width: 32px;
	height: 32px;
	border-radius: 50%;
	flex-shrink: 0;
	object-fit: cover;
}
.suggestion-avatar-placeholder {
	width: 32px;
	height: 32px;
	border-radius: 50%;
	flex-shrink: 0;
	background: oklch(0.40 0.01 70);
}
.suggestion-text {
	display: flex;
	flex-direction: column;
	min-width: 0;
}
.suggestion-name {
	font-weight: 700;
	font-size: var(--t-s);
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}
.suggestion-handle {
	font-size: var(--t-xs);
	color: oklch(0.65 0.01 70);
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}
textarea {
	resize: vertical;
	line-height: 1.4;
	font-family: 'JetBrains Mono', 'Menlo', monospace;
	font-size: var(--t-s);
}
/* Buttons and button-styled links share one base. .btn-secondary
   is the ghost variant — muted, reserved for withdrawal
   actions (sign out) and secondary CTAs (sign in next to
   "Enroll a domain"). Keeping them as class variants on a
   single base means the aesthetic stays consistent when we
   change padding or weight in one place. */
button,
.btn {
	display: inline-block;
	font-family: inherit;
	font-size: var(--t-s);
	font-weight: 700;
	letter-spacing: 0.02em;
	color: var(--bg);
	background: var(--ink);
	border: 1px solid var(--ink);
	padding: 0.65rem 1.5rem;
	margin-top: 1.25rem;
	cursor: pointer;
	text-decoration: none;
	transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
}
.btn-secondary,
button.btn-secondary {
	color: var(--ink);
	background: transparent;
	border-color: var(--line);
}
button:hover,
.btn:hover {
	background: var(--accent);
	border-color: var(--accent);
	color: var(--bg);
}
.btn-secondary:hover,
button.btn-secondary:hover {
	background: var(--ink);
	border-color: var(--ink);
	color: var(--bg);
}

/* Credential box — inverse of the page (surface white on paper).
   This is the ONE boxed element on the success page; everything
   else is just typography. Makes the API key impossible to miss. */
.credential {
	margin: 1.5rem 0;
	padding: 1.25rem 1.5rem;
	background: var(--surface);
	border: 1px solid var(--line);
}
.credential-label {
	font-size: var(--t-xs);
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.12em;
	color: var(--accent);
	margin-bottom: 0.5rem;
}
.credential-note {
	font-size: var(--t-xs);
	font-style: italic;
	color: var(--muted);
	margin-top: 0.75rem;
}

.dns-block {
	margin: 1.25rem 0;
}
.dns-block-label {
	font-family: 'JetBrains Mono', monospace;
	font-size: var(--t-xs);
	color: var(--muted);
	margin-bottom: 0.25rem;
}

.bullets {
	margin: 0.5rem 0;
	padding-left: 1.25rem;
}
.bullets li {
	margin-bottom: 0.25rem;
}

/* Footer — light, one line, hairline rule. `margin-top: auto`
   on a flex child in a column container pushes the footer to
   the bottom of whatever space is left, so it sticks to the
   viewport bottom on short pages. The 2.25rem minimum keeps
   a comfortable gap from tall content pages (Terms, Privacy)
   because `auto` collapses to 0 when the flex parent is
   already at or beyond its main size. */
footer {
	margin-top: auto;
	padding-top: 1rem;
	border-top: 1px solid var(--line);
	font-size: var(--t-xs);
	color: var(--muted);
	text-align: left;
	line-height: 1.6;
}
/* Reserve breathing room above the footer when content is tall.
   `margin-top: auto` alone would push the footer against the
   content when the page overflows; this gives it its historical
   2.25rem gap on long pages. */
footer::before {
	content: "";
	display: block;
	height: 2.25rem;
}
footer a { color: var(--muted); text-decoration-color: var(--line); }
footer a:hover { color: var(--ink); text-decoration-color: var(--ink); }

.error-note {
	margin: 2rem 0;
	padding: 1rem 1.25rem;
	background: oklch(0.95 0.03 25);
	border: 1px solid oklch(0.85 0.06 25);
	color: var(--ink);
	font-size: var(--t-s);
}

/* Resolver hint — small inline feedback below the identity input
   while a handle is being resolved to its DID. */
.resolver-hint {
	display: none;
	font-family: 'JetBrains Mono', 'Menlo', monospace;
	font-size: var(--t-xs);
	margin: 0.25rem 0 0.5rem;
	line-height: 1.4;
}
.resolver-hint.is-loading { display: block; color: var(--muted); font-style: italic; font-family: var(--font-body); }
.resolver-hint.is-ok      { display: block; color: var(--ink); }
.resolver-hint.is-ok::before  { content: "→ "; color: var(--accent); font-weight: 700; }
.resolver-hint.is-err     { display: block; color: var(--accent-ink); }
.resolver-hint.is-err::before { content: "⚠ "; }

/* Mobile tightening — the 680px reading column + 2rem padding
   already mostly handles this, but at narrow widths the
   masthead is too big and forms get cramped. */
@media (max-width: 520px) {
	.page { padding: 1.5rem 1.25rem 2rem; }
	.masthead { font-size: 2.25rem; }
	/* Sub-page masthead must stay smaller than the landing masthead
	   on mobile too — without this rule, the later .masthead size
	   wins by source order (same specificity) and the Round 2
	   landing-only drop-cap motif dilutes on phones. */
	.masthead-sub { font-size: 1.625rem; }
	.lede { font-size: var(--t-m); margin-bottom: 1rem; }
	.section { margin-top: 1.25rem; padding-top: 0.75rem; }
}

/* Collapsible section disclosure (chainlink #381).
   openSectionTitleSummary in web/templates/signup.go sets list-style:none
   to hide the browser-default triangle so the chevron sits in a known
   location; we re-add a visible indicator via this ::after pseudo. The
   marker rotates 90deg in the open state to flip ▸ → ▾ without two
   different glyphs. Sized to match the title row baseline; spaces away
   from the rightmost element (the status pill) so it doesn't crowd. */
details > summary.section-title-summary::after {
	content: "▸";
	margin-left: 0.75rem;
	color: var(--muted, #6c7480);
	font-size: 0.9em;
	transition: transform 120ms ease;
	display: inline-block;
}
details[open] > summary.section-title-summary::after {
	transform: rotate(90deg);
}