/**
 * LMS Lab — lms-app foundation (clean rebuild)
 *
 * Single source of truth for the new LifterLMS front-end UI.
 * Everything is scoped under `.lms-app` so it can never leak into the global
 * header/footer or be overridden by the legacy LMS stylesheets.
 *
 * Layers in this file:
 *   1. Design tokens (.lms-app)
 *   2. Base typography / resets (scoped)
 *   3. Primitives: buttons, cards, badges, progress, empty states
 *   4. Account-area layout (sidebar + main grid over LifterLMS markup)
 *   5. Sidebar navigation component
 *   6. Diagnostic helper (temporary, Stage 0 proof)
 *
 * @package LMS_Lab
 */

/* =========================================================================
   1. Tokens
   ========================================================================= */

.lms-app {
	--la-font-head: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	--la-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

	--la-bg: #f6f7f9;
	--la-surface: #ffffff;
	--la-surface-soft: #f5f5f7;
	--la-border: rgba(16, 24, 40, 0.08);
	--la-border-strong: rgba(16, 24, 40, 0.12);

	--la-text: #0a0a0a;
	--la-text-body: #344054;
	--la-muted: #6e6e82;

	--la-accent: #e30613;
	--la-accent-hover: #c70512;
	--la-accent-soft: rgba(227, 6, 19, 0.10);
	--la-accent-soft-strong: rgba(227, 6, 19, 0.14);

	--la-blue: #2563eb;
	--la-blue-soft: #eff4ff;
	--la-green: #15803d;
	--la-green-soft: #ecfdf3;
	--la-amber: #b54708;
	--la-amber-soft: #fef6e7;

	--la-radius-lg: 20px;
	--la-radius: 16px;
	--la-radius-sm: 12px;
	--la-radius-xs: 8px;
	--la-pill: 999px;

	--la-shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.04);
	--la-shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 12px 32px rgba(16, 24, 40, 0.05);

	--la-ease: 160ms cubic-bezier(0.4, 0, 0.2, 1);

	color: var(--la-text-body);
	font-family: var(--la-font-body);
}

/* =========================================================================
   2. Base (scoped)
   ========================================================================= */

.lms-app *,
.lms-app *::before,
.lms-app *::after {
	box-sizing: border-box;
}

.lms-app h1,
.lms-app h2,
.lms-app h3,
.lms-app h4 {
	font-family: var(--la-font-head);
	color: var(--la-text);
	letter-spacing: -0.02em;
}

.lms-app a {
	text-decoration: none;
}

/* Zero-specificity default so component button/link colors always win. */
:where(.lms-app) a {
	color: inherit;
}

.lms-app img {
	max-width: 100%;
	height: auto;
	display: block;
}

/* =========================================================================
   3. Primitives
   ========================================================================= */

.lms-app__btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	min-height: 2.75rem;
	padding: 0.625rem 1.25rem;
	border: 1px solid transparent;
	border-radius: var(--la-radius-sm);
	font-family: var(--la-font-body);
	font-size: 0.875rem;
	font-weight: 600;
	line-height: 1.4;
	cursor: pointer;
	transition: background var(--la-ease), color var(--la-ease), border-color var(--la-ease), transform var(--la-ease);
}

.lms-app__btn svg {
	width: 1.125rem;
	height: 1.125rem;
	flex: 0 0 auto;
}

.lms-app__btn--primary {
	background: var(--la-accent);
	color: #fff;
}

.lms-app__btn--primary:hover {
	background: var(--la-accent-hover);
}

.lms-app__btn--ghost {
	background: var(--la-surface);
	border-color: var(--la-border);
	color: var(--la-text);
}

.lms-app__btn--ghost:hover {
	background: var(--la-surface-soft);
}

.lms-app__card {
	background: var(--la-surface);
	border: 1px solid var(--la-border);
	border-radius: var(--la-radius);
	box-shadow: var(--la-shadow-sm);
}

.lms-app__badge {
	display: inline-flex;
	align-items: center;
	gap: 0.3rem;
	padding: 0.25rem 0.625rem;
	border-radius: var(--la-radius-xs);
	font-size: 0.75rem;
	font-weight: 700;
	line-height: 1.4;
}

.lms-app__badge--success { background: var(--la-green-soft); color: var(--la-green); }
.lms-app__badge--neutral { background: var(--la-surface-soft); color: var(--la-muted); }
.lms-app__badge--accent  { background: var(--la-accent-soft); color: var(--la-accent); }

.lms-app__progress {
	display: block;
	width: 100%;
	height: 0.375rem;
	border-radius: var(--la-pill);
	background: #eef0f3;
	overflow: hidden;
}

.lms-app__progress-fill {
	display: block;
	height: 100%;
	border-radius: inherit;
	background: var(--la-accent);
	transition: width var(--la-ease);
}

.lms-app__progress-fill.is-complete { background: var(--la-green); }

/* Empty state */
.lms-app__empty {
	display: flex;
	flex-direction: column;
	align-items: center;
	text-align: center;
	gap: 0.75rem;
	padding: 3rem 1.5rem;
	background: var(--la-surface);
	border: 1px dashed var(--la-border-strong);
	border-radius: var(--la-radius);
}

.lms-app__empty-icon {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 3.25rem;
	height: 3.25rem;
	border-radius: var(--la-pill);
	background: var(--la-accent-soft);
	color: var(--la-accent);
}

.lms-app__empty-icon svg { width: 1.5rem; height: 1.5rem; }
.lms-app__empty-title { margin: 0; font-size: 1.0625rem; font-weight: 700; }
.lms-app__empty-text { margin: 0; max-width: 28rem; font-size: 0.9375rem; color: var(--la-muted); }
.lms-app__empty .lms-app__btn { margin-top: 0.5rem; }

/* =========================================================================
   4. Account-area layout (over LifterLMS markup)
   ========================================================================= */

.lms-app--account-area {
	background: var(--la-bg);
	padding: 2.5rem 0 4rem;
}

.lms-app__container {
	width: min(100% - 2.5rem, 80rem);
	margin-inline: auto;
}

/* LifterLMS wraps everything in .lifterlms > .llms-student-dashboard.
   We only use these classes as integration hooks for grid placement. */
.lms-app .lifterlms,
.lms-app .llms-student-dashboard {
	width: 100%;
	max-width: none;
	margin: 0;
}

.lms-app .llms-student-dashboard {
	display: grid;
	gap: 2rem;
	align-items: start;
}

@media (min-width: 900px) {
	.lms-app .llms-student-dashboard {
		grid-template-columns: 15rem minmax(0, 1fr);
		grid-template-areas:
			"nav header"
			"nav notice"
			"nav tab";
	}
}

.lms-app .lms-app__sidebar { grid-area: nav; }
.lms-app .llms-sd-header,
.lms-app .llms-sd-title { grid-area: header; }
.lms-app .llms-notice { grid-area: notice; margin: 0; }
.lms-app .llms-sd-tab,
.lms-app .llms-sd-wrapper { grid-area: tab; min-width: 0; }

/* LifterLMS section title (used on endpoint tabs, hidden on dashboard) */
.lms-app .llms-sd-title {
	margin: 0 0 1.25rem;
	font-size: clamp(1.375rem, 2.2vw, 1.625rem);
	font-weight: 700;
	line-height: 1.25;
}

.lms-app--dashboard .llms-sd-header,
.lms-app--dashboard .llms-sd-title:first-child {
	display: none;
}

/* =========================================================================
   5. Sidebar navigation
   ========================================================================= */

.lms-app__sidebar {
	display: flex;
	flex-direction: column;
	gap: 0.25rem;
}

@media (min-width: 900px) {
	.lms-app__sidebar {
		position: sticky;
		top: 1.5rem;
	}
}

.lms-app__user {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	padding: 1rem 0.75rem 1.5rem;
}

.lms-app__avatar {
	flex: 0 0 auto;
	width: 2.5rem;
	height: 2.5rem;
	border-radius: var(--la-pill);
	overflow: hidden;
	background: var(--la-accent-soft);
}

.lms-app__avatar img { width: 100%; height: 100%; object-fit: cover; }

.lms-app__user-id { min-width: 0; }

.lms-app__user-name {
	margin: 0;
	font-size: 0.875rem;
	font-weight: 700;
	line-height: 1.4286;
	color: var(--la-text);
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}

.lms-app__user-role {
	margin: 0.0625rem 0 0;
	font-size: 0.75rem;
	line-height: 1.4;
	color: var(--la-muted);
}

.lms-app__nav {
	display: flex;
	flex-direction: column;
	gap: 0.25rem;
	margin: 0;
	padding: 0;
	list-style: none;
}

.lms-app__nav-item { margin: 0; padding: 0; list-style: none; }

.lms-app__nav-link {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	width: 100%;
	min-height: 2.5rem;
	padding: 0.625rem 0.75rem;
	border-radius: var(--la-radius);
	color: var(--la-muted);
	font-size: 0.875rem;
	font-weight: 600;
	line-height: 1.35;
	transition: background var(--la-ease), color var(--la-ease);
}

.lms-app__nav-icon {
	flex: 0 0 auto;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 1.125rem;
	height: 1.125rem;
}

.lms-app__nav-icon svg { width: 1.125rem; height: 1.125rem; display: block; }
.lms-app__nav-label { min-width: 0; }

.lms-app__nav-link:hover {
	color: var(--la-text);
	background: var(--la-surface-soft);
}

.lms-app__nav-link:focus-visible {
	outline: 2px solid rgba(227, 6, 19, 0.4);
	outline-offset: 2px;
}

.lms-app__nav-item.is-active .lms-app__nav-link {
	color: var(--la-accent);
	background: var(--la-accent-soft);
}

.lms-app__nav-item.is-active .lms-app__nav-link:hover {
	background: var(--la-accent-soft-strong);
}

/* Secondary section (sign out, extras) */
.lms-app__nav--secondary {
	margin-top: 0.5rem;
	padding-top: 0.5rem;
	border-top: 1px solid #ececf1;
}

.lms-app__nav-item--signout .lms-app__nav-link { color: #b42318; }
.lms-app__nav-item--signout .lms-app__nav-link:hover { color: #912018; background: #fef3f2; }

/* Mobile: horizontal pill scroller */
@media (max-width: 899.98px) {
	body.logged-in .lms-app .llms-student-dashboard {
		grid-template-columns: minmax(0, 1fr);
		grid-template-areas: none;
	}

	body.logged-in .lms-app .lms-app__sidebar,
	body.logged-in .lms-app .llms-sd-header,
	body.logged-in .lms-app .llms-sd-title,
	body.logged-in .lms-app .llms-notice,
	body.logged-in .lms-app .llms-sd-tab,
	body.logged-in .lms-app .llms-sd-wrapper {
		grid-area: auto;
	}

	.lms-app__user { display: none; }

	.lms-app__sidebar {
		flex-direction: row;
		align-items: stretch;
		width: 100%;
		min-width: 0;
		overflow: hidden;
		margin-bottom: 1.25rem;
	}

	.lms-app__nav,
	.lms-app__nav--secondary {
		flex-direction: row;
		gap: 0.5rem;
		width: 100%;
		overflow-x: auto;
		margin: 0;
		padding: 0 0 0.25rem;
		border-top: 0;
		scrollbar-width: none;
	}

	.lms-app__nav {
		flex: 1 1 auto;
		min-width: 0;
		width: auto;
	}

	.lms-app__nav--secondary {
		flex: 0 0 auto;
		width: auto;
		overflow-x: visible;
	}

	.lms-app__nav::-webkit-scrollbar,
	.lms-app__nav--secondary::-webkit-scrollbar { display: none; }

	.lms-app__nav-link {
		width: auto;
		white-space: nowrap;
		border: 1px solid var(--la-border);
		background: var(--la-surface);
		padding: 0.5rem 0.875rem;
	}

	.lms-app__nav-item.is-active .lms-app__nav-link {
		border-color: rgba(227, 6, 19, 0.22);
		background: var(--la-accent-soft);
	}
}