/**
 * Pickle — thư viện bài tập (/bai-tap/): bộ lọc, thẻ bài tập, trang một bài tập, sơ đồ sân.
 * Chỉ nạp ở trang thư viện, trang bài tập và trang tìm kiếm có kết quả là bài tập.
 * Màu, cỡ chữ, khoảng cách dùng biến trong assets/css/main.css.
 */

/* 1. Sơ đồ sân (cùng màu với sơ đồ ở trang Sơ đồ sân)
   ========================================================================== */
.drill-svg {
	display: block;
	width: 100%;
	height: auto;
	background: var(--color-primary);
	border-radius: var(--radius);
}

.drill-svg__surface,
.drill-svg__floor {
	fill: #12805E;
}

.drill-svg__kitchen {
	fill: #1A8F6A;
}

.drill-svg__lines {
	fill: none;
	stroke: #F7F8F2;
	stroke-width: 3;
}

.drill-svg__net {
	stroke: var(--color-text);
	stroke-width: 6;
	stroke-linecap: round;
}

.drill-svg__wall {
	fill: var(--color-footer-text);
}

.drill-svg__zone {
	fill: rgba(212, 242, 59, 0.45);
}

.drill-svg__dim {
	fill: rgba(18, 38, 30, 0.55);
}

.drill-svg__ball {
	fill: none;
	stroke: var(--color-accent);
	stroke-width: 3;
	stroke-dasharray: 2 8;
	stroke-linecap: round;
}

.drill-svg__ball--feed {
	stroke: #FFFFFF;
}

.drill-svg__move {
	fill: none;
	stroke: #FFFFFF;
	stroke-width: 3;
}

.drill-svg__stop {
	fill: none;
	stroke: #FFFFFF;
	stroke-width: 2;
	stroke-dasharray: 4 4;
}

.drill-svg__head--ball {
	fill: var(--color-accent);
}

.drill-svg__head--move {
	fill: #FFFFFF;
}

.drill-svg__bounce {
	fill: var(--color-accent);
	stroke: var(--color-text);
	stroke-width: 2;
}

.drill-svg__player circle {
	fill: #FFFFFF;
	stroke: var(--color-text);
	stroke-width: 2.5;
}

.drill-svg__player text {
	fill: var(--color-text);
	font-family: var(--font-sans);
	font-size: 13px;
	font-weight: var(--fw-extrabold);
	text-anchor: middle;
}

.drill-svg__player--ghost {
	opacity: 0.45;
}

/* 2. Nhãn thông tin (kỹ năng, cấp, số người, thời lượng)
   ========================================================================== */
.drill-facts {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-1);
	margin: var(--space-2) 0 0;
	padding: 0;
	list-style: none;
}

.drill-facts li {
	display: inline-flex;
	align-items: center;
	min-height: 32px;
	padding: 0 var(--space-2);
	background: var(--color-primary-soft);
	border-radius: var(--radius-pill);
	color: var(--color-primary-dark);
	font-size: var(--fs-sm);
	font-weight: var(--fw-semibold);
}

.drill-facts--card {
	margin: 0;
}

.drill-facts--card li {
	min-height: 24px;
	padding: 0 var(--space-1);
	font-size: var(--fs-xs);
}

/* 3. Trang thư viện: bộ lọc, lưới thẻ, khi chưa có bài
   ========================================================================== */
.drill-filters {
	display: grid;
	gap: var(--space-2);
	margin-bottom: var(--space-4);
}

.drill-filters__label {
	margin: 0 0 var(--space-1);
	font-size: var(--fs-sm);
	font-weight: var(--fw-bold);
}

.drill-filters__chips {
	margin-top: 0;
}

.drill-count {
	margin: 0 0 var(--space-2);
	color: var(--color-text-muted);
	font-size: var(--fs-sm);
}

.drill-grid {
	display: grid;
	gap: var(--space-3);
	margin: 0;
	padding: 0;
	list-style: none;
}

.drill-grid__item {
	display: flex;
}

.drill-card {
	position: relative;
	display: flex;
	flex-direction: column;
	width: 100%;
	overflow: hidden;
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	box-shadow: var(--shadow-sm);
	transition: border-color var(--transition), box-shadow var(--transition);
}

/* Cả thẻ bấm được qua liên kết ở tiêu đề; vòng focus vẽ quanh cả thẻ */
.drill-card:focus-within {
	outline: 3px solid var(--color-primary);
	outline-offset: 3px;
}

.drill-card__title a:focus-visible {
	outline: none;
}

.drill-card .drill-svg {
	border-radius: 0;
}

.drill-card__placeholder {
	display: flex;
	align-items: center;
	justify-content: center;
	aspect-ratio: 2 / 1;
	background: var(--color-primary-soft);
	color: var(--color-primary);
}

.drill-card__placeholder .icon {
	width: 48px;
	height: 48px;
}

.drill-card__body {
	display: flex;
	flex: 1;
	flex-direction: column;
	gap: var(--space-1);
	padding: var(--space-2);
}

.drill-card__title {
	margin: 0;
	font-size: var(--fs-h3);
	line-height: var(--lh-snug);
}

.drill-card__title a {
	color: var(--color-text);
	text-decoration: none;
}

.drill-card__title a::after {
	content: "";
	position: absolute;
	inset: 0;
}

.drill-card__lead {
	margin: 0;
	color: var(--color-text-muted);
	font-size: var(--fs-sm);
}

.drill-card__lead-label {
	color: var(--color-text);
	font-weight: var(--fw-semibold);
}

@media (hover: hover) {
	.drill-card:hover {
		border-color: var(--color-primary);
		box-shadow: var(--shadow);
	}

	.drill-card:hover .drill-card__title a {
		color: var(--color-primary);
	}
}

.drill-empty {
	max-width: var(--content-width);
	padding: var(--space-3);
	background: var(--color-surface);
	border: 1px dashed var(--color-border-strong);
	border-radius: var(--radius);
}

.drill-empty p:last-child {
	margin-bottom: 0;
}

.drill-empty__actions {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-1);
}

.drills .drill-safety {
	max-width: var(--content-width);
}

/* 4. Trang một bài tập
   ========================================================================== */
.drill-page {
	padding-bottom: var(--space-6);
}

.drill-page .entry-header {
	margin-bottom: var(--space-4);
	padding-top: var(--space-6);
}

.drill-header__glossary {
	margin: var(--space-2) 0 0;
	color: var(--color-text-muted);
	font-size: var(--fs-sm);
}

.drill-intro {
	margin-bottom: var(--space-4);
}

.drill-figure {
	margin: 0 0 var(--space-4);
}

.drill-figure figcaption {
	margin-top: var(--space-1);
	color: var(--color-text-muted);
	font-size: var(--fs-sm);
}

.drill-figure__caption {
	display: block;
}

.drill-legend {
	display: flex;
	flex-wrap: wrap;
	gap: 0 var(--space-2);
	margin-top: var(--space-1);
	font-size: var(--fs-xs);
}

.drill-section {
	margin-top: var(--space-5);
}

.drill-section:first-of-type {
	margin-top: 0;
}

.drill-section__title,
.drill-count-box__title {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: var(--space-1);
	margin: 0 0 var(--space-2);
	font-size: var(--fs-h3);
	line-height: var(--lh-snug);
}

.drill-prepare,
.drill-mistakes {
	margin: 0;
	padding-left: var(--space-3);
}

.drill-prepare li,
.drill-mistakes li {
	margin-bottom: var(--space-1);
}

.drill-goal {
	margin-top: var(--space-4);
	padding: var(--space-2) var(--space-3);
	background: var(--color-accent-soft);
	border-radius: var(--radius);
}

.drill-goal__title {
	display: flex;
	align-items: center;
	gap: var(--space-1);
	margin: 0 0 var(--space-1);
	color: var(--color-primary-dark);
	font-size: var(--fs-base);
}

.drill-goal p {
	margin: 0;
	font-size: var(--fs-lead);
	font-weight: var(--fw-semibold);
}

.drill-steps {
	margin: 0;
	padding: 0;
	list-style: none;
	counter-reset: drill-step;
}

.drill-steps li {
	position: relative;
	min-height: 32px;
	margin-bottom: var(--space-2);
	padding-left: var(--space-5);
	counter-increment: drill-step;
}

.drill-steps li::before {
	content: counter(drill-step);
	position: absolute;
	top: 0;
	left: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	width: 32px;
	height: 32px;
	background: var(--color-primary);
	border-radius: 50%;
	color: #FFFFFF;
	font-size: var(--fs-sm);
	font-weight: var(--fw-bold);
}

.drill-count-box {
	margin-top: var(--space-5);
	padding: var(--space-2) var(--space-3);
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
}

.drill-count-box__title {
	margin-bottom: var(--space-1);
}

.drill-count-box__tag {
	padding: 0 var(--space-1);
	background: var(--color-primary-soft);
	border-radius: var(--radius-pill);
	color: var(--color-primary-dark);
	font-size: var(--fs-xs);
	font-weight: var(--fw-semibold);
	line-height: 24px;
}

.drill-count-box p {
	margin: 0 0 var(--space-1);
}

.drill-count-box p:last-child {
	margin-bottom: 0;
}

.drill-count-box__note {
	color: var(--color-text-muted);
	font-size: var(--fs-sm);
}

.drill-levels {
	display: grid;
	gap: var(--space-2);
	margin: 0;
	padding: 0;
	list-style: none;
}

.drill-level {
	padding: var(--space-2);
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-left-width: 8px;
	border-radius: var(--radius);
}

.drill-level--easier {
	border-left-color: var(--color-primary-soft);
}

.drill-level--harder {
	border-left-color: var(--color-primary);
}

.drill-level--game {
	border-left-color: var(--color-accent);
}

.drill-level__title {
	margin: 0;
	font-size: var(--fs-h4);
}

.drill-level__hint {
	margin: 0 0 var(--space-1);
	color: var(--color-text-muted);
	font-size: var(--fs-sm);
}

.drill-level p:last-child {
	margin-bottom: 0;
}

.drill-video {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: var(--space-1) var(--space-2);
	margin: var(--space-4) 0 0;
}

.drill-video__host {
	color: var(--color-text-muted);
	font-size: var(--fs-sm);
}

.drill-sources ul {
	margin: 0;
	padding-left: var(--space-3);
	font-size: var(--fs-sm);
}

.drill-sources li {
	margin-bottom: var(--space-1);
	overflow-wrap: anywhere;
}

.drill-back {
	margin: var(--space-4) 0 0;
}

/* 5. Màn hình lớn hơn
   ========================================================================== */
@media (min-width: 640px) {
	.drill-grid {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}

@media (min-width: 768px) {
	.drill-filters {
		gap: var(--space-3);
	}

	.drill-page .entry-header {
		padding-top: var(--space-8);
	}
}

@media (min-width: 1024px) {
	.drill-grid {
		grid-template-columns: repeat(3, minmax(0, 1fr));
	}
}

@media (min-width: 1200px) {
	.drill-page .entry-header {
		padding-top: var(--space-10);
	}
}

/* Thêm vào buổi tập (trang một bài) và liên kết sang Buổi tập (trang danh sách) */
.drill-session {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: var(--space-1) var(--space-2);
	margin-top: var(--space-4);
}

.drill-session .button:disabled {
	opacity: 1;
	background: var(--color-primary-soft);
	border-color: var(--color-primary-soft);
	color: var(--color-primary-dark);
	cursor: default;
}

.drill-session__open {
	display: inline-flex;
	align-items: center;
	min-height: var(--tap);
	font-weight: var(--fw-bold);
}

.drill-session__note {
	flex-basis: 100%;
	margin: 0;
	color: #9A3412;
	font-size: var(--fs-sm);
	font-weight: var(--fw-semibold);
}

.drills-session-link {
	margin: var(--space-2) 0 0;
}

.drills-session-link a {
	display: inline-flex;
	align-items: center;
	gap: var(--space-1);
	min-height: var(--tap);
	font-weight: var(--fw-bold);
}

.drills-session-link .icon {
	flex-shrink: 0;
	width: 20px;
	height: 20px;
}

@media print {
	.drill-filters,
	.drill-back,
	.drill-video,
	.drill-session,
	.drills-session-link,
	.section--related {
		display: none;
	}

	.drill-card,
	.drill-goal,
	.drill-count-box,
	.drill-level {
		box-shadow: none;
		break-inside: avoid;
	}
}