/* ══════════════════════════════════════════════════════════════
   Zhanchao Yang — Reading Notes (single note)
   Loads after home.css and inherits its tokens.

   The Thoughts index reads like graph paper. A note itself should
   read like a book: warm ivory ground, one narrow serif column,
   ruled section breaks, and marginal numbers in place of loud
   headings. Same palette as the rest of the site, slower gear.
══════════════════════════════════════════════════════════════ */

body.note-page {
	--accent: #456a96;
	--accent-deep: #34527a;
	--paper: #fbf8f2;
	--paper-deep: #f3efe5;
	--rule: rgba(11, 35, 69, 0.1);
	--measure: 34rem;

	background: var(--paper);
	color: var(--ink);
	font-family: var(--sans);
	font-size: 16px;
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
	overflow-x: hidden;
}

body.note-page .site-nav {
	background: rgba(251, 248, 242, 0.88);
}
body.note-page .nav-links a.active {
	color: var(--accent-deep);
}
body.note-page .nav-links a::after {
	background: var(--accent);
}
body.note-page .footer-links a:hover {
	color: var(--accent-deep);
}
body.note-page .footer-links a::after {
	background: var(--accent);
}
@media (max-width: 720px) {
	body.note-page .nav-links {
		background: var(--paper);
	}
}

/* ── Reading progress: a hairline across the top ──────────── */
.nt-progress {
	position: fixed;
	top: 0;
	left: 0;
	height: 2px;
	width: 100%;
	z-index: 60;
	transform: scaleX(0);
	transform-origin: 0 50%;
	background: linear-gradient(90deg, var(--accent) 0%, var(--terracotta) 100%);
	opacity: 0.85;
	will-change: transform;
}

/* ══ Masthead ═════════════════════════════════════════════ */
.nt-hero {
	padding: 150px 0 0;
}
.nt-hero-inner,
.nt-body {
	max-width: 62rem;
	margin: 0 auto;
	padding-left: 36px;
	padding-right: 36px;
}
.nt-crumb {
	display: inline-flex;
	align-items: center;
	gap: 9px;
	font-size: 0.8rem;
	font-weight: 500;
	letter-spacing: 0.1em;
	text-transform: uppercase;
	color: var(--ink-faint);
	text-decoration: none;
	transition: color 0.25s ease;
}
.nt-crumb .arrow {
	display: inline-block;
	transition: transform 0.3s ease;
}
.nt-crumb:hover {
	color: var(--accent-deep);
}
.nt-crumb:hover .arrow {
	transform: translateX(-4px);
}

/* the issue line: a numbered note, dated, rule running out to the edge */
.nt-issue {
	display: flex;
	align-items: baseline;
	gap: 16px;
	margin: 36px 0 24px;
	font-size: 0.74rem;
	font-weight: 600;
	letter-spacing: 0.22em;
	text-transform: uppercase;
	color: var(--accent-deep);
}
.nt-issue-no {
	font-family: var(--serif);
	font-size: 1.5rem;
	font-weight: 600;
	letter-spacing: 0.02em;
	text-transform: none;
	color: var(--terracotta);
	line-height: 1;
}
.nt-issue-rule {
	flex: 1;
	height: 1px;
	background: var(--rule);
}
.nt-issue-date {
	letter-spacing: 0.14em;
	font-weight: 500;
	color: var(--ink-faint);
}

.nt-hero h1 {
	font-family: var(--serif);
	font-size: clamp(2.4rem, 6vw, 4rem);
	font-weight: 600;
	line-height: 1.05;
	letter-spacing: -0.022em;
	max-width: 18ch;
}
.nt-hero h1 em {
	font-style: italic;
	color: var(--accent);
}
.nt-dek {
	margin-top: 22px;
	font-family: var(--serif);
	font-size: clamp(1.08rem, 2vw, 1.3rem);
	line-height: 1.6;
	color: var(--ink-soft);
	max-width: 46ch;
}

/* the book this note came out of, set like a library card */
.nt-source {
	display: flex;
	align-items: center;
	gap: 22px;
	margin-top: 40px;
	padding: 20px 24px;
	background: var(--surface);
	border: 1px solid var(--line-soft);
	border-left: 3px solid var(--accent);
	border-radius: 0 4px 4px 0;
	max-width: 34rem;
	box-shadow: var(--shadow);
}
.nt-source img {
	width: 64px;
	height: auto;
	display: block;
	border-radius: 2px;
	box-shadow: 0 1px 3px rgba(11, 35, 69, 0.18),
		0 8px 20px rgba(11, 35, 69, 0.12);
}
.nt-source-label {
	font-size: 0.68rem;
	font-weight: 600;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--accent);
	margin-bottom: 7px;
}
.nt-source-title {
	font-family: var(--serif);
	font-size: 1.16rem;
	font-weight: 600;
	font-style: italic;
	line-height: 1.25;
	margin-bottom: 4px;
}
.nt-source-author {
	font-size: 0.88rem;
	color: var(--ink-faint);
}

.nt-meta {
	display: flex;
	flex-wrap: wrap;
	gap: 10px 22px;
	margin-top: 30px;
	padding-top: 18px;
	border-top: 1px solid var(--rule);
	font-size: 0.76rem;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--ink-faint);
}
.nt-meta .nt-tag {
	color: var(--accent-deep);
}

/* ══ The essay column ═════════════════════════════════════ */
.nt-body {
	padding-top: 56px;
	padding-bottom: 24px;
}
.nt-section {
	position: relative;
	max-width: var(--measure);
	margin: 0 auto;
	padding-top: 56px;
}
.nt-section.is-open {
	padding-top: 8px;
}

/* headings carry a small marginal number, tucked outside the column */
.nt-section > h2 {
	position: relative;
	font-family: var(--serif);
	font-size: clamp(1.35rem, 2.6vw, 1.72rem);
	font-weight: 600;
	line-height: 1.2;
	letter-spacing: -0.012em;
	margin-bottom: 24px;
	padding-top: 20px;
	border-top: 1px solid var(--rule);
}
.nt-section > h2::before {
	content: attr(data-no);
	position: absolute;
	left: -74px;
	top: 22px;
	width: 52px;
	text-align: right;
	font-family: var(--sans);
	font-size: 0.72rem;
	font-weight: 600;
	letter-spacing: 0.14em;
	color: var(--accent);
	opacity: 0.8;
}
.nt-section.is-open > h2 {
	border-top: none;
	padding-top: 0;
}
.nt-section.is-open > h2::before {
	top: 3px;
}

.nt-section p {
	font-family: var(--serif);
	font-size: 1.08rem;
	line-height: 1.78;
	color: rgba(11, 35, 69, 0.86);
	margin-bottom: 20px;
}
.nt-section p strong {
	font-weight: 600;
	color: var(--ink);
}

/* opening paragraph gets a drop cap; only that one */
.nt-section.is-open > p:first-of-type::first-letter {
	float: left;
	font-family: var(--serif);
	font-size: 3.9rem;
	line-height: 0.82;
	font-weight: 600;
	color: var(--accent-deep);
	padding: 6px 12px 0 0;
}

/* a short line meant to land on its own, set a little apart */
.nt-beat {
	font-size: 1.12rem !important;
	font-style: italic;
	color: var(--accent-deep) !important;
	margin: 26px 0 !important;
	padding-left: 18px;
	border-left: 2px solid rgba(69, 106, 150, 0.3);
}

/* the questions the essay turns on */
.nt-quote {
	margin: 40px 0;
}
.nt-quote p {
	font-size: clamp(1.3rem, 2.8vw, 1.62rem) !important;
	font-style: italic;
	font-weight: 600;
	line-height: 1.34 !important;
	letter-spacing: -0.012em;
	color: var(--ink) !important;
	margin: 0 !important;
	padding-left: 30px;
	border-left: 3px solid var(--terracotta);
}
.nt-quote cite {
	display: block;
	margin: 14px 0 0 33px;
	font-family: var(--sans);
	font-size: 0.76rem;
	font-style: normal;
	letter-spacing: 0.14em;
	text-transform: uppercase;
	color: var(--ink-faint);
}

/* short paragraphs the essay stacks like a list */
.nt-stack {
	margin: 26px 0;
	padding: 22px 26px;
	background: var(--paper-deep);
	border-radius: 4px;
}
.nt-stack p {
	margin-bottom: 12px;
	font-size: 1.02rem;
	line-height: 1.7;
}
.nt-stack p:last-child {
	margin-bottom: 0;
}

/* the working principles the reflection keeps arriving at */
.nt-principle {
	position: relative;
	margin: 34px 0 !important;
	padding: 22px 26px 22px 28px;
	background: var(--paper-deep);
	border-left: 3px solid var(--terracotta);
	border-radius: 0 4px 4px 0;
	font-size: 1.12rem !important;
	font-weight: 600;
	line-height: 1.5 !important;
	color: var(--ink) !important;
	box-shadow: var(--shadow);
}
.nt-principle-no {
	display: block;
	margin-bottom: 9px;
	font-family: var(--sans);
	font-size: 0.68rem;
	font-weight: 600;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--accent);
}

/* end mark */
.nt-dinkus {
	max-width: var(--measure);
	margin: 52px auto 0;
	text-align: center;
	color: var(--ink-faint);
}
.nt-dinkus b {
	font-family: var(--serif);
	font-size: 1.4rem;
	font-weight: 400;
	letter-spacing: 0.5em;
	opacity: 0.6;
}

/* ══ Colophon ═════════════════════════════════════════════ */
.nt-end {
	max-width: var(--measure);
	margin: 60px auto 0;
	padding-top: 28px;
	border-top: 1px solid var(--rule);
}
.nt-ack {
	font-size: 0.88rem;
	line-height: 1.72;
	color: var(--ink-faint);
	font-style: italic;
	margin-bottom: 26px;
}
.nt-endlinks {
	display: flex;
	flex-wrap: wrap;
	gap: 12px 26px;
}
.nt-endlinks a {
	display: inline-flex;
	align-items: center;
	gap: 9px;
	font-size: 0.88rem;
	font-weight: 500;
	letter-spacing: 0.03em;
	color: var(--accent-deep);
	text-decoration: none;
	border-bottom: 1px solid rgba(69, 106, 150, 0.35);
	padding-bottom: 3px;
	transition: color 0.25s ease, border-color 0.25s ease;
}
.nt-endlinks .arrow {
	display: inline-block;
	transition: transform 0.3s ease;
}
.nt-endlinks a:hover {
	color: var(--ink);
	border-bottom-color: var(--ink);
}
.nt-endlinks a:hover .arrow {
	transform: translateX(4px);
}

.nt-next {
	padding: 70px 0 90px;
}
.nt-next-line {
	max-width: var(--measure);
	margin: 0 auto;
	font-family: var(--serif);
	font-size: 1rem;
	line-height: 1.8;
	color: var(--ink-soft);
	padding: 24px 28px;
	background: var(--paper-deep);
	border-left: 2px solid var(--accent);
	border-radius: 0 4px 4px 0;
}
.nt-next-line a {
	color: var(--accent-deep);
	text-decoration: none;
	border-bottom: 1px solid rgba(69, 106, 150, 0.4);
	transition: color 0.25s ease, border-color 0.25s ease;
}
.nt-next-line a:hover {
	color: var(--ink);
	border-bottom-color: var(--ink);
}

/* ══ Responsive ═══════════════════════════════════════════ */
@media (max-width: 1080px) {
	.nt-section > h2::before {
		position: static;
		display: block;
		width: auto;
		text-align: left;
		margin-bottom: 8px;
	}
}

@media (max-width: 720px) {
	.nt-hero {
		padding-top: 118px;
	}
	.nt-issue {
		flex-wrap: wrap;
		gap: 8px 14px;
	}
	.nt-issue-no {
		white-space: nowrap;
	}
	.nt-issue-rule {
		display: none;
	}
	.nt-issue-date {
		flex-basis: 100%;
	}
	.nt-hero-inner,
	.nt-body {
		padding-left: 24px;
		padding-right: 24px;
	}
	.nt-body {
		padding-top: 40px;
	}
	.nt-source {
		gap: 16px;
		padding: 16px 18px;
	}
	.nt-principle {
		padding: 18px 18px 18px 20px;
		font-size: 1.05rem !important;
	}
	.nt-source img {
		width: 54px;
	}
	.nt-section {
		padding-top: 44px;
	}
	.nt-section p {
		font-size: 1.04rem;
	}
	.nt-quote p {
		padding-left: 20px;
	}
	.nt-stack {
		padding: 18px;
	}
	.nt-next {
		padding: 54px 0 76px;
	}
}

@media (prefers-reduced-motion: reduce) {
	.nt-crumb .arrow,
	.nt-endlinks .arrow {
		transition: none !important;
		transform: none !important;
	}
}