/* สมุดเพลง — พื้นใบลาน การ์ดเลื่อนแนวนอน
   ตัวเลื่อนคือ CSS scroll-snap ของเบราว์เซอร์ ไม่ได้เขียน JS มาดักการปัด
   จึงลื่นเท่าการเลื่อนหน้าเว็บปกติ และไม่กินแรงเครื่อง */

.tw-book {
	--tw-book-brass: #C9A227;
	--tw-book-celadon: #5E8F84;
	--tw-book-leaf: #E8E2D2;
	--tw-book-page: #F2EDE0;
	--tw-book-edge: #DCD4BE;
	--tw-book-ink: #22303A;
	--tw-book-body: #3E4C56;
	--tw-book-faint: #8A8570;
	background: var(--tw-book-leaf);
	padding: 74px 0 66px;
	overflow: hidden;
}

.tw-book__head {
	max-width: 1140px;
	margin: 0 auto;
	padding: 0 28px;
}

.tw-book__eyebrow {
	font-size: .78rem;
	font-weight: 500;
	letter-spacing: .22em;
	color: var(--tw-book-celadon);
	margin: 0 0 16px;
}

.tw-book__title {
	font-family: "Trirong", serif;
	font-weight: 500;
	font-size: clamp(1.5rem, 3.4vw, 2.2rem);
	line-height: 1.45;
	color: var(--tw-book-ink);
	margin: 0 0 10px;
}

.tw-book__hint {
	display: flex;
	align-items: center;
	gap: 7px;
	font-size: .82rem;
	color: #6E7B85;
	margin: 0 0 26px;
}

.tw-book__hint-icon svg {
	display: block;
	width: 17px;
	height: 17px;
}

/* ---- ตัวเลื่อน ---- */
.tw-book__viewport {
	max-width: 1140px;
	margin: 0 auto;
}

.tw-book__track {
	display: flex;
	gap: 14px;
	margin: 0;
	padding: 4px 28px 20px;
	list-style: none;
	overflow-x: auto;
	overscroll-behavior-x: contain;
	scroll-snap-type: x mandatory;
	scroll-padding-left: 28px;
	-webkit-overflow-scrolling: touch;
	scrollbar-width: none;
}

.tw-book__track::-webkit-scrollbar {
	display: none;
}

.tw-book__track:focus-visible {
	outline: 2px solid var(--tw-book-brass);
	outline-offset: 2px;
}

.tw-book__page {
	flex: 0 0 78%;
	scroll-snap-align: start;
	display: flex;
}

/* ---- การ์ดหนึ่งหน้า ---- */
.tw-book__card {
	display: flex;
	flex-direction: column;
	width: 100%;
	background: var(--tw-book-page);
	border: 1px solid var(--tw-book-edge);
	padding: 24px 22px 22px;
	transition: border-color .3s ease;
}

.tw-book__page.is-active .tw-book__card {
	border-color: var(--tw-book-brass);
}

.tw-book__card-top {
	display: flex;
	justify-content: space-between;
	align-items: baseline;
	gap: 12px;
}

.tw-book__chapter {
	font-size: .68rem;
	letter-spacing: .2em;
	color: var(--tw-book-faint);
}

.tw-book__count {
	font-family: "Chonburi", serif;
	font-size: .88rem;
	color: var(--tw-book-brass);
}

.tw-book__song {
	font-family: "Chonburi", serif;
	font-weight: 400;
	font-size: 1.36rem;
	line-height: 1.45;
	color: var(--tw-book-ink);
	margin: 16px 0 0;
}

.tw-book__rule {
	display: block;
	width: 38px;
	height: 1px;
	background: var(--tw-book-brass);
	margin: 17px 0;
}

.tw-book__body {
	font-size: .95rem;
	line-height: 1.95;
	color: var(--tw-book-body);
}

.tw-book__body p {
	margin: 0 0 .85rem;
}

.tw-book__body p:last-child {
	margin-bottom: 0;
}

.tw-book__flag {
	display: flex;
	align-items: center;
	gap: 7px;
	margin: 20px 0 0;
	font-size: .76rem;
	letter-spacing: .1em;
	color: var(--tw-book-celadon);
}

.tw-book__flag svg {
	display: block;
	width: 13px;
	height: 13px;
}

/* ป้ายแบบกดได้ — ทำเป็นแถบเต็มความกว้างเพื่อให้นิ้วแตะง่ายบนมือถือ */
.tw-book .tw-book__flag--link {
	margin-top: auto;
	padding-top: 18px;
	border-top: 1px solid var(--tw-book-edge);
	color: var(--tw-book-celadon);
	text-decoration: none;
	min-height: 44px;
	box-sizing: content-box;
	transition: color .2s ease;
}

.tw-book .tw-book__flag--link:hover,
.tw-book .tw-book__flag--link:focus-visible {
	color: var(--tw-book-brass);
}

.tw-book__flag-arrow {
	margin-left: auto;
	display: flex;
	transition: transform .25s ease;
}

.tw-book__flag-arrow svg {
	width: 15px;
	height: 15px;
}

.tw-book .tw-book__flag--link:hover .tw-book__flag-arrow {
	transform: translateY(3px);
}

/* กระพริบขอบทองเหลืองที่ปลายทาง ให้รู้ว่าลงมาถึงตรงไหนแล้ว */
@keyframes tw-jump-flash {
	0%, 100% { box-shadow: 0 0 0 0 rgba( 201, 162, 39, 0 ); }
	18%, 62% { box-shadow: 0 0 0 2px rgba( 201, 162, 39, .8 ); }
}

.tw-jump-target {
	animation: tw-jump-flash 1.7s ease;
	scroll-margin-top: 90px;
}

.tw-jump-target:focus {
	outline: none;
}

/* ---- แถบล่าง: ปุ่มกับจุดบอกหน้า ---- */
.tw-book__foot {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 18px;
	max-width: 1140px;
	margin: 6px auto 0;
	padding: 0 28px;
}

.tw-book__nav {
	display: none;
	width: 42px;
	height: 42px;
	flex: 0 0 auto;
	align-items: center;
	justify-content: center;
	padding: 0;
	cursor: pointer;
	background: transparent;
	border: 1px solid var(--tw-book-edge);
	border-radius: 50%;
	color: var(--tw-book-ink);
	transition: border-color .25s ease, color .25s ease, opacity .25s ease;
}

.tw-book__nav svg {
	width: 17px;
	height: 17px;
}

.tw-book__nav:hover:not(:disabled) {
	border-color: var(--tw-book-brass);
	color: var(--tw-book-brass);
}

.tw-book__nav:disabled {
	opacity: .3;
	cursor: default;
}

.tw-book__dots {
	display: flex;
	align-items: center;
	gap: 7px;
}

.tw-book__dot {
	width: 7px;
	height: 2px;
	background: #C4BCA4;
	transition: width .3s ease, background .3s ease;
}

.tw-book__dot.is-active {
	width: 22px;
	background: var(--tw-book-brass);
}

@media (min-width: 861px) {
	.tw-book {
		padding: 110px 0 96px;
	}

	.tw-book__page {
		flex-basis: clamp(300px, 32%, 372px);
	}

	.tw-book__nav {
		display: flex;
	}

	/* เดสก์ท็อปเห็นสามใบพร้อมกันอยู่แล้ว ไม่ต้องบอกให้ปัด */
	.tw-book__hint {
		display: none;
	}
}

@media (prefers-reduced-motion: reduce) {
	.tw-book__dot,
	.tw-book__card,
	.tw-book__nav,
	.tw-book__flag-arrow,
	.tw-book .tw-book__flag--link {
		transition: none;
	}

	.tw-jump-target {
		animation: none;
	}
}

@media print {
	.tw-book__track {
		display: block;
		overflow: visible;
	}

	.tw-book__page {
		break-inside: avoid;
		margin-bottom: 14px;
	}

	.tw-book__foot,
	.tw-book__hint {
		display: none;
	}
}