/* =========================================================
   Challenges listing page
   Extends the shared palette + components from css/style.css.
   ========================================================= */

.challenges-main {
	max-width: 1180px;
	justify-content: flex-start;
	gap: clamp(1.25rem, 3vh, 2rem);
}

.challenges-heading h1 {
	font-family: "Space Grotesk", "Nunito Sans", sans-serif;
	font-size: clamp(1.75rem, 3vw, 2.25rem);
	color: var(--blue-dark);
	margin: 0 0 0.5rem;
}

.challenges-heading p {
	margin: 0;
	max-width: 44rem;
	color: var(--text-muted);
}

.challenge-grid {
	list-style: none;
	margin: 0;
	padding: 0;
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr));
	gap: 1.5rem;
}

.challenge-card {
	background: var(--card-bg);
	border: 1px solid var(--card-border);
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-sm);
	overflow: hidden;
	display: flex;
	flex-direction: column;
	transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.challenge-card:hover {
	box-shadow: var(--shadow-md);
	transform: translateY(-3px);
}

/* ---- CSS-drawn card artwork (envelope + warning badge) ---- */
.challenge-card-visual {
	position: relative;
	height: 11rem;
	background: var(--blue-soft);
	border-bottom: 1px solid var(--card-border);
	display: flex;
	align-items: center;
	justify-content: center;
}

.cv-envelope {
	position: relative;
	width: 8.5rem;
	height: 5.75rem;
	background: var(--card-bg);
	border: 2px solid var(--blue);
	border-radius: 0.85rem;
	overflow: hidden;
}

/* The flap: a square rotated 45deg, showing only two edges as a "V". */
.cv-envelope::before {
	content: "";
	position: absolute;
	top: -3.55rem;
	left: 50%;
	width: 6rem;
	height: 6rem;
	transform: translateX(-50%) rotate(45deg);
	background: var(--blue-soft);
	border-right: 2px solid var(--blue);
	border-bottom: 2px solid var(--blue);
	border-bottom-right-radius: 0.6rem;
}

.cv-badge {
	position: absolute;
	right: calc(50% - 5.6rem);
	bottom: 2.1rem;
	width: 2.6rem;
	height: 2.6rem;
	border-radius: 50%;
	display: flex;
	align-items: center;
	justify-content: center;
	background: var(--challenge-warn-bg);
	border: 2px solid var(--challenge-warn-border);
	color: var(--challenge-warn-text);
	font-family: "Space Grotesk", "Nunito Sans", sans-serif;
	font-size: 1.4rem;
	font-weight: 700;
	line-height: 1;
	box-shadow: var(--shadow-sm);
}

/* Warm accent used only for the "caution" affordances on this page. */
.challenge-card-visual,
.challenge-card {
	--challenge-warn-bg: #fdf3e0;
	--challenge-warn-border: #c9861a;
	--challenge-warn-text: #7a5210;
}

/* ---- Card body ---- */
.challenge-card-body {
	display: flex;
	flex-direction: column;
	gap: 0.65rem;
	padding: 1.25rem;
	flex: 1 1 auto;
}

.challenge-card-title {
	margin: 0;
	font-family: "Space Grotesk", "Nunito Sans", sans-serif;
	font-size: 1.25rem;
	color: var(--blue-dark);
}

.challenge-card-desc {
	margin: 0;
	font-size: 0.9375rem;
	color: var(--text-muted);
	flex: 1 1 auto;
}

.challenge-card-tags {
	display: flex;
	flex-wrap: wrap;
	gap: 0.4rem;
	margin: 0;
	padding: 0;
	list-style: none;
}

.challenge-card-tag {
	background: var(--teal-soft);
	color: var(--teal-dark);
	border-radius: 999px;
	padding: 0.25rem 0.75rem;
	font-size: 0.75rem;
	font-weight: 700;
}

.challenge-card-meta {
	display: flex;
	flex-wrap: wrap;
	gap: 0.35rem 1rem;
	margin: 0;
	font-size: 0.8125rem;
	font-weight: 600;
	color: var(--text-muted);
}

.challenge-card-status {
	display: flex;
	flex-direction: column;
	gap: 0.15rem;
	padding: 0.65rem 0.85rem;
	border-radius: var(--radius-sm);
	background: var(--blue-soft);
	border: 1px solid var(--card-border);
}

.challenge-card-status-label {
	font-size: 0.875rem;
	font-weight: 700;
	color: var(--blue-dark);
}

.challenge-card-status-detail {
	font-size: 0.8125rem;
	color: var(--text-muted);
}

.challenge-card-footer {
	padding: 0 1.25rem 1.25rem;
}

.challenge-card-btn {
	display: block;
	width: 100%;
	text-align: center;
}

.challenge-grid-error {
	text-align: center;
	color: var(--text-muted);
}

/* ---- Loading skeleton ---- */
.challenge-card-skeleton {
	min-height: 24rem;
	background: var(--blue-soft);
	opacity: 0.55;
	animation: challenge-skeleton-pulse 1.4s ease-in-out infinite;
}

@keyframes challenge-skeleton-pulse {
	0%, 100% { opacity: 0.4; }
	50% { opacity: 0.7; }
}

/* ---- Responsive ---- */
@media (max-width: 560px) {
	.challenge-grid {
		grid-template-columns: 1fr;
	}

	.challenge-card-visual {
		height: 9rem;
	}
}

@media (prefers-reduced-motion: reduce) {
	.challenge-card,
	.challenge-card:hover {
		transition: none;
		transform: none;
	}

	.challenge-card-skeleton {
		animation: none;
	}
}