/* @achoo254/app-shell: the signed-out chrome of every app, the layout of
   the account app (auth-next src/ui/layout.ts and static/css/app.css:
   .topbar, .idp-brand, .topbar-link, .container, .card, .auth-card, .btn,
   .page-foot, .lang-switch, .foot-link). Every colour, radius, duration and
   spacing step is a tokens.css variable; load tokens.css first. Classes all
   start with "shell-" and no element is styled outside them (the app's own
   content inside <main> keeps its own box sizing and focus ring), so the
   file sits next to Tailwind (unlayered, it wins over its preflight) or
   plain CSS.
   Breakpoints: 900px (hero beside its card), 640px, 480px (phones), 380px
   and 360px (narrow phones); touch screens get 44px targets. */

.shell {
	display: flex;
	flex-direction: column;
	min-height: 100vh;
	min-height: 100dvh;
	font-family: var(--font-sans);
	font-size: 1rem;
	line-height: 1.55;
	color: var(--c-text);
	background-color: var(--c-bg);
	background-image: linear-gradient(var(--c-grid) 1px, transparent 1px),
		linear-gradient(90deg, var(--c-grid) 1px, transparent 1px);
	background-size: var(--grid-size) var(--grid-size);
	background-position: -1px -1px;
	-webkit-font-smoothing: antialiased;
}
/* the shell's own elements only; :where() keeps them easy to override */
:where([class^="shell-"], [class*=" shell-"]),
:where([class^="shell-"], [class*=" shell-"])::before,
:where([class^="shell-"], [class*=" shell-"])::after {
	box-sizing: border-box;
}
:where([class^="shell-"], [class*=" shell-"]):focus-visible {
	outline: 2px solid var(--c-primary);
	outline-offset: 2px;
}
.shell-container {
	width: 100%;
	max-width: var(--container);
	margin-inline: auto;
	padding-inline: var(--gutter);
}
.shell-main {
	flex: 1 0 auto;
}
/* focused by the skip link, not by a click: no ring around the whole body */
.shell-main:focus {
	outline: none;
}
/* skip link: off screen until a keyboard user tabs onto it */
.shell-skip-link {
	position: absolute;
	top: var(--space-2);
	left: var(--space-2);
	z-index: 40;
	padding: var(--space-2) var(--space-4);
	border-radius: var(--radius-sm);
	background: var(--c-primary-solid);
	color: var(--c-on-primary);
	font-weight: 600;
	text-decoration: none;
	transform: translateY(calc(-100% - var(--space-4)));
}
.shell-skip-link:focus {
	transform: none;
}
/* /login: one card in the middle of the page */
.shell-main-center {
	display: grid;
	place-items: center;
	padding-block: var(--space-7) var(--space-8);
}
.shell-sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}
.shell-icon {
	flex: none;
	stroke-width: var(--icon-stroke);
}

/* top bar + wordmark */
.shell-topbar {
	position: sticky;
	top: 0;
	z-index: 30;
	padding-top: env(safe-area-inset-top, 0px);
	background: color-mix(in srgb, var(--c-bg) 82%, transparent);
	backdrop-filter: blur(10px);
	border-bottom: 1px solid var(--c-border-subtle);
}
.shell-topbar-inner {
	min-height: var(--topbar-h);
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-3);
}
.shell-brand {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	min-width: 0;
	min-height: 44px;
	font-family: var(--font-sans);
	font-size: 1rem;
	color: var(--c-text);
	text-decoration: none;
}
.shell-brand-mark {
	flex: none;
	display: block;
	width: 24px;
	height: 24px;
}
.shell-brand-name {
	font-weight: 700;
	color: var(--c-primary);
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}
.shell-topbar-end,
.shell-topbar-nav {
	display: flex;
	align-items: center;
	gap: var(--space-1);
	flex: none;
}
/* also a <button> (sign out) or a <form>'s button: same look as the links */
.shell-topbar-link {
	margin: 0;
	border: 0;
	background: none;
	cursor: pointer;
	font-family: var(--font-mono);
	font-size: 13px;
	font-weight: 600;
	line-height: 1.55;
	color: var(--c-text-muted);
	text-decoration: none;
	white-space: nowrap;
	padding: var(--space-2) var(--space-3);
	border-radius: var(--radius-sm);
	transition: background-color var(--dur-fast) var(--ease-standard), color
		var(--dur-fast) var(--ease-standard);
}
.shell-topbar-link:hover {
	color: var(--c-text);
	background: color-mix(in srgb, var(--c-text) 6%, transparent);
}
/* the current page, and the call to sign in: the tinted pill */
.shell-topbar-link[aria-current="page"],
.shell-topbar-cta {
	color: var(--c-primary);
	background: color-mix(in srgb, var(--c-primary) 10%, transparent);
}
.shell-topbar-cta:hover {
	color: var(--c-primary);
	background: color-mix(in srgb, var(--c-primary) 16%, transparent);
}
/* a form in the account slot (sign out by POST): lays out as its button */
.shell-topbar-form {
	display: contents;
}

/* account menu of a signed-in user (AccountMenu): avatar + name button,
   a <details> whose panel hangs under it, right-aligned */
.shell-account {
	position: relative;
	flex: none;
}
.shell-account-trigger {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	min-height: 40px;
	padding: var(--space-1) var(--space-2);
	border-radius: var(--radius-sm);
	cursor: pointer;
	list-style: none;
	color: var(--c-text-muted);
	transition: background-color var(--dur-fast) var(--ease-standard);
}
.shell-account-trigger::-webkit-details-marker {
	display: none;
}
.shell-account-trigger:hover,
.shell-account[open] > .shell-account-trigger {
	background: color-mix(in srgb, var(--c-text) 6%, transparent);
}
.shell-avatar {
	flex: none;
	display: block;
	width: 28px;
	height: 28px;
	border-radius: var(--radius-sm);
	object-fit: cover;
}
.shell-avatar-initial {
	display: grid;
	place-items: center;
	background: var(--c-primary-solid);
	color: var(--c-on-primary);
	font-family: var(--font-mono);
	font-size: 13px;
	font-weight: 700;
}
.shell-avatar-initial::before {
	content: attr(data-initial);
}
.shell-account-name {
	max-width: 12rem;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
	font-family: var(--font-mono);
	font-size: 13px;
}
.shell-account-panel {
	position: absolute;
	top: calc(100% + var(--space-2));
	right: 0;
	z-index: 40;
	width: max-content;
	min-width: 16rem;
	max-width: min(22rem, calc(100vw - 2 * var(--space-4)));
	padding: var(--space-1);
	background: var(--c-surface);
	border: 1px solid var(--c-border);
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-lg);
	font-family: var(--font-sans);
	font-size: 14px;
	line-height: 1.4;
	color: var(--c-text);
}
.shell-account-head {
	display: grid;
	gap: 2px;
	padding: var(--space-2) var(--space-3);
}
.shell-account-head-name {
	font-weight: 600;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}
.shell-account-head-email,
.shell-account-heading {
	font-family: var(--font-mono);
	font-size: 12px;
	color: var(--c-text-muted);
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}
.shell-account-heading {
	display: block;
	padding: var(--space-2) var(--space-3) var(--space-1);
}
.shell-account-group {
	display: grid;
	padding-top: var(--space-1);
	margin-top: var(--space-1);
	border-top: 1px solid var(--c-border-subtle);
}
.shell-account-form {
	display: contents;
}
.shell-account-item {
	display: flex;
	align-items: center;
	gap: var(--space-3);
	width: 100%;
	min-height: 36px;
	margin: 0;
	padding: var(--space-2) var(--space-3);
	border: 0;
	border-radius: var(--radius-sm);
	background: none;
	cursor: pointer;
	font: inherit;
	text-align: start;
	color: var(--c-text);
	text-decoration: none;
}
.shell-account-item:hover {
	background: color-mix(in srgb, var(--c-text) 6%, transparent);
}
.shell-account-item:disabled {
	cursor: default;
	opacity: 0.6;
}
.shell-account-item > .shell-icon {
	color: var(--c-icon-muted);
}
.shell-account-label {
	flex: 1;
	min-width: 0;
}

/* card + the one call to action */
.shell-card {
	background: var(--c-surface);
	border: 1px solid var(--c-border);
	border-radius: var(--radius-xl);
	box-shadow: var(--shadow-sm);
}
.shell-sign-in-card {
	width: 100%;
	max-width: 420px;
	padding: var(--space-6) var(--space-5);
	display: grid;
	gap: var(--space-4);
}
.shell-card-title {
	margin: 0;
	font-family: var(--font-mono);
	font-weight: 700;
	font-size: 22px;
	line-height: 1.25;
	letter-spacing: -0.01em;
	color: var(--c-text);
}
.shell-card-sub {
	margin: var(--space-1) 0 0;
	font-size: 14px;
	color: var(--c-text-muted);
}
.shell-card-note {
	margin: 0;
	font-size: 13px;
	line-height: 1.5;
	text-align: center;
	color: var(--c-text-muted);
}
.shell-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: var(--space-2);
	min-height: 44px;
	padding: 0 var(--space-4);
	border-radius: var(--radius-md);
	font-family: var(--font-mono);
	font-weight: 600;
	font-size: 14px;
	line-height: 1;
	border: 1px solid transparent;
	cursor: pointer;
	text-decoration: none;
	white-space: nowrap;
	transition: background-color var(--dur-fast) var(--ease-standard),
		border-color var(--dur-fast) var(--ease-standard), color var(--dur-fast)
		var(--ease-standard);
}
.shell-btn-primary {
	background: var(--c-primary-solid);
	color: var(--c-on-primary);
	box-shadow: var(--shadow-glow-primary);
}
.shell-btn-primary:hover {
	background: var(--c-primary-solid-hover);
	color: var(--c-on-primary);
}
/* full width, one line: "Đăng nhập bằng hoandat.com" fits a 320px phone */
.shell-btn-cta {
	width: 100%;
}
/* sign-in under way: same label and size, dimmed, clicks ignored */
.shell-btn[aria-busy="true"] {
	cursor: progress;
	opacity: 0.7;
}

/* welcome page: hero, then the features */
.shell-hero {
	display: grid;
	align-items: center;
	gap: var(--space-6);
	padding-block: var(--space-7) var(--space-6);
}
.shell-hero-intro {
	display: grid;
	gap: var(--space-4);
	min-width: 0;
}
.shell-hero-aside {
	display: grid;
	justify-items: center;
	min-width: 0;
}
.shell-eyebrow {
	justify-self: start;
	margin: 0;
	padding: var(--space-1) var(--space-3);
	font-family: var(--font-mono);
	font-size: 12px;
	font-weight: 600;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--c-primary);
	border: 1px solid color-mix(in srgb, var(--c-primary) 30%, var(--c-surface));
	border-radius: var(--radius-full);
	background: color-mix(in srgb, var(--c-primary) 8%, var(--c-surface));
}
.shell-hero-title {
	margin: 0;
	font-family: var(--font-mono);
	font-weight: 700;
	letter-spacing: -0.02em;
	font-size: clamp(1.75rem, 1.2rem + 2.4vw, 3rem);
	line-height: 1.12;
	color: var(--c-text);
}
.shell-lede {
	margin: 0;
	max-width: 34em;
	font-size: 1.125rem;
	color: var(--c-text-muted);
}
.shell-features {
	display: grid;
	gap: var(--space-5);
	padding-block: var(--space-6) var(--space-7);
	scroll-margin-top: calc(var(--topbar-h) + var(--space-4));
}
.shell-features-head {
	display: grid;
	gap: var(--space-3);
}
.shell-section-title {
	margin: 0;
	font-family: var(--font-mono);
	font-weight: 700;
	font-size: clamp(1.375rem, 1.1rem + 1.2vw, 2rem);
	line-height: 1.2;
	letter-spacing: -0.01em;
	color: var(--c-text);
}
.shell-feature-grid {
	display: grid;
	gap: var(--space-4);
	margin: 0;
	padding: 0;
	list-style: none;
}
.shell-feature {
	display: grid;
	align-content: start;
	gap: var(--space-2);
	padding: var(--space-5);
	border-radius: var(--radius-lg);
}
.shell-feature-title {
	display: flex;
	align-items: center;
	gap: var(--space-2);
	margin: 0;
	font-family: var(--font-mono);
	font-weight: 700;
	font-size: 16px;
	line-height: 1.3;
	color: var(--c-text);
}
.shell-feature-icon {
	display: inline-flex;
	flex: none;
	color: var(--c-primary);
}
.shell-feature-text {
	margin: 0;
	font-size: 15px;
	color: var(--c-text-muted);
}
@media (min-width: 640px) {
	.shell-feature-grid {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}
@media (min-width: 900px) {
	.shell-hero {
		padding-block: var(--space-9) var(--space-7);
	}
	.shell-hero-split {
		grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
		gap: var(--space-8);
	}
	.shell-feature-grid {
		grid-template-columns: repeat(3, minmax(0, 1fr));
	}
}

/* footer: the two switches, then one quiet row of links */
.shell-foot {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: var(--space-3);
	padding-top: var(--space-6);
	padding-bottom: calc(var(--space-7) + env(safe-area-inset-bottom, 0px));
}
.shell-foot-switches {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: center;
	gap: var(--space-3);
}
.shell-lang-switch {
	display: inline-flex;
	min-width: 0;
	margin: 0;
	flex-wrap: wrap;
	justify-content: center;
	gap: 2px;
	padding: 2px;
	border: 1px solid var(--c-border);
	border-radius: var(--radius-full);
	background: var(--c-surface);
}
.shell-lang-option {
	margin: 0;
	font-family: var(--font-mono);
	font-size: 13px;
	font-weight: 600;
	line-height: 1.55;
	color: var(--c-text-muted);
	text-decoration: none;
	padding: var(--space-1) var(--space-3);
	border: 1px solid transparent;
	border-radius: var(--radius-full);
	background: none;
	cursor: pointer;
}
.shell-lang-option:hover {
	color: var(--c-text);
}
.shell-lang-option[aria-current="true"],
.shell-lang-option[aria-pressed="true"] {
	color: var(--c-primary);
	background: color-mix(in srgb, var(--c-primary) 8%, var(--c-surface));
	border-color: color-mix(in srgb, var(--c-primary) 30%, var(--c-surface));
}
.shell-theme-switch {
	display: inline-flex;
	gap: var(--space-1);
	min-width: 0;
	margin: 0;
	padding: var(--space-1);
	border: 1px solid var(--c-border);
	border-radius: var(--radius-full);
	background: var(--c-surface);
}
.shell-theme-option {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 32px;
	height: 32px;
	margin: 0;
	padding: 0;
	border: 0;
	border-radius: var(--radius-full);
	background: none;
	color: var(--c-text-muted);
	cursor: pointer;
	transition: background-color var(--dur-fast) var(--ease-standard), color
		var(--dur-fast) var(--ease-standard);
}
.shell-theme-option:hover {
	color: var(--c-text);
	background: color-mix(in srgb, var(--c-text) 6%, transparent);
}
.shell-theme-option[aria-pressed="true"] {
	color: var(--c-on-primary);
	background: var(--c-primary-solid);
}
.shell-foot-links {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	column-gap: var(--space-4);
	margin: 0;
}
/* a link, or a <button> footer item (Feedback opening a form) */
.shell-foot-link {
	margin: 0;
	padding: 0;
	border: 0;
	background: none;
	cursor: pointer;
	font: inherit;
	font-size: 13px;
	color: var(--c-text-muted);
	text-decoration: none;
}
.shell-foot-link:hover,
.shell-foot-link[aria-current="page"] {
	color: var(--c-text);
	text-decoration: underline;
	text-underline-offset: 2px;
}
.shell-foot-note {
	margin: 0;
	max-width: 40em;
	font-size: 12px;
	line-height: 1.5;
	text-align: center;
	color: var(--c-text-muted);
}
/* header links PublicPage repeats in the footer: phones only */
.shell-foot-link.shell-only-phone {
	display: none;
}

/* touch screens and phones: every header and footer control is a 44 x 44
   target, short words ("Terms", "登录") padded out to the width */
@media (pointer: coarse), (max-width: 479px) {
	.shell-topbar-link,
	.shell-foot-link,
	.shell-lang-option {
		display: inline-flex;
		align-items: center;
		justify-content: center;
		min-width: 44px;
		min-height: 44px;
	}
	.shell-theme-option {
		width: 44px;
		height: 44px;
	}
	.shell-account-trigger,
	.shell-account-item {
		min-height: 44px;
	}
}
/* below 640px the avatar alone: the name is in the menu and the label */
@media (max-width: 639px) {
	.shell-account-name {
		display: none;
	}
}
@media (min-width: 480px) {
	.shell-sign-in-card {
		padding: var(--space-6);
	}
}
/* phones */
@media (max-width: 479px) {
	.shell-hide-phone {
		display: none;
	}
	.shell-foot-link.shell-only-phone {
		display: inline-flex;
	}
	.shell-topbar-link {
		padding-inline: var(--space-2);
	}
	.shell-hero {
		padding-block: var(--space-6) var(--space-5);
	}
	.shell-main-center {
		padding-block: var(--space-6) var(--space-7);
	}
}
/* narrow phones */
@media (max-width: 379px) {
	.shell-topbar-link {
		padding-inline: var(--space-1);
	}
	.shell-sign-in-card {
		padding: var(--space-5) var(--space-4);
	}
}
@media (max-width: 359px) {
	.shell-topbar-inner {
		gap: var(--space-2);
	}
	.shell-topbar-link,
	.shell-btn {
		font-size: 12px;
	}
}