:root {
	--ink: #17212b;
	--muted: #5f6d7a;
	--line: #d8e0e8;
	--soft: #f4f7fb;
	--panel: #ffffff;
	--blue: #2364aa;
	--cyan: #2a9dbe;
	--green: #31866b;
	--gold: #c9892b;
	--red: #b64b4b;
	--shadow: 0 18px 40px rgba(28, 45, 66, 0.12);
}

* {
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
}

body {
	margin: 0;
	color: var(--ink);
	background: #fbfcfd;
	font-family: Arial, Helvetica, sans-serif;
	line-height: 1.5;
}

a {
	color: inherit;
	text-decoration: none;
}

img {
	display: block;
	max-width: 100%;
}

code {
	padding: 2px 5px;
	border: 1px solid var(--line);
	border-radius: 4px;
	background: #eef3f7;
	font-size: 0.95em;
}

.topbar {
	position: sticky;
	top: 0;
	z-index: 10;
	display: flex;
	align-items: center;
	justify-content: space-between;
	min-height: 64px;
	padding: 0 32px;
	border-bottom: 1px solid rgba(216, 224, 232, 0.9);
	background: rgba(251, 252, 253, 0.94);
	backdrop-filter: blur(12px);
}

.brand {
	font-weight: 700;
	color: var(--blue);
}

.nav {
	display: flex;
	gap: 8px;
	align-items: center;
}

.nav a {
	padding: 8px 10px;
	border-radius: 6px;
	color: var(--muted);
	font-size: 0.95rem;
}

.nav a:hover {
	background: #eef3f7;
	color: var(--ink);
}

.hero {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(360px, 520px);
	gap: 40px;
	align-items: center;
	min-height: calc(100vh - 64px);
	padding: 68px 7vw 54px;
	background:
		linear-gradient(90deg, rgba(35, 100, 170, 0.08), transparent 55%),
		linear-gradient(180deg, #ffffff, #f5f8fb);
}

.hero-text {
	max-width: 760px;
}

.eyebrow {
	margin: 0 0 10px;
	color: var(--green);
	font-size: 0.78rem;
	font-weight: 700;
	letter-spacing: 0;
	text-transform: uppercase;
}

h1,
h2,
h3,
p {
	margin-top: 0;
}

h1 {
	max-width: 760px;
	margin-bottom: 18px;
	font-size: clamp(2.4rem, 5vw, 5rem);
	line-height: 1;
	letter-spacing: 0;
}

h2 {
	margin-bottom: 14px;
	font-size: clamp(1.7rem, 3vw, 2.6rem);
	line-height: 1.08;
	letter-spacing: 0;
}

h3 {
	margin-bottom: 8px;
	font-size: 1.08rem;
}

.lead {
	max-width: 680px;
	color: var(--muted);
	font-size: 1.12rem;
}

.hero-actions {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	margin-top: 28px;
}

.button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-height: 44px;
	padding: 0 18px;
	border-radius: 7px;
	font-weight: 700;
}

.button.primary {
	color: #ffffff;
	background: var(--blue);
}

.button.secondary {
	border: 1px solid var(--line);
	background: #ffffff;
}

.hero-panel {
	position: relative;
	padding: 28px;
	border: 1px solid #c9d6e2;
	border-radius: 8px;
	background: #ffffff;
	box-shadow: var(--shadow);
}

.board-title {
	margin-bottom: 22px;
	padding: 14px;
	border-radius: 6px;
	color: #ffffff;
	background: #2c5f8d;
	font-size: 1.35rem;
	font-weight: 700;
	text-align: center;
}

.signal-row {
	display: grid;
	grid-template-columns: 50px 1fr;
	gap: 14px;
	align-items: center;
	margin: 16px 0;
	color: var(--muted);
	font-weight: 700;
}

.signal {
	height: 44px;
	border: 1px solid var(--line);
	border-radius: 6px;
	background:
		linear-gradient(90deg, transparent 0 14%, var(--blue) 14% 16%, transparent 16% 32%, var(--blue) 32% 34%, transparent 34% 51%, var(--blue) 51% 53%, transparent 53% 72%, var(--blue) 72% 74%, transparent 74% 100%),
		linear-gradient(180deg, transparent 0 47%, var(--line) 47% 53%, transparent 53%);
}

.button-signal {
	background-color: #f8fbfd;
}

.knob-bar {
	height: 16px;
	overflow: hidden;
	border-radius: 4px;
	background: #e7edf3;
}

.knob-bar i {
	display: block;
	height: 100%;
	background: var(--gold);
}

.knob-bar.accent i {
	background: var(--cyan);
}

.speaker-lines {
	display: grid;
	gap: 12px;
	margin-top: 26px;
}

.speaker-lines div {
	display: grid;
	grid-template-columns: 50px 1fr;
	gap: 14px;
	align-items: center;
	color: var(--muted);
	font-weight: 700;
}

.speaker-lines b {
	height: 10px;
	border-radius: 2px;
	background:
		repeating-linear-gradient(90deg, var(--red) 0 30px, transparent 30px 48px),
		#eef3f7;
}

.summary-strip {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	border-top: 1px solid var(--line);
	border-bottom: 1px solid var(--line);
	background: #ffffff;
}

.summary-strip div {
	padding: 28px 24px;
	border-right: 1px solid var(--line);
	text-align: center;
}

.summary-strip div:last-child {
	border-right: 0;
}

.summary-strip strong {
	display: block;
	margin-bottom: 4px;
	color: var(--blue);
	font-size: 2rem;
	line-height: 1;
}

.summary-strip span {
	color: var(--muted);
	font-size: 0.95rem;
}

.section {
	padding: 76px 7vw;
}

.section:nth-of-type(even) {
	background: var(--soft);
}

.section-heading {
	max-width: 760px;
	margin-bottom: 28px;
}

.section-heading p:last-child {
	color: var(--muted);
}

.hardware-grid,
.chord-grid,
.module-grid {
	display: grid;
	grid-template-columns: repeat(4, minmax(0, 1fr));
	gap: 16px;
}

.hardware-card,
.chord-card,
.module-card {
	min-height: 150px;
	padding: 20px;
	border: 1px solid var(--line);
	border-radius: 8px;
	background: var(--panel);
}

.hardware-card p,
.module-card p {
	margin-bottom: 0;
	color: var(--muted);
}

.pin-table {
	margin-top: 30px;
	overflow: auto;
	border: 1px solid var(--line);
	border-radius: 8px;
	background: #ffffff;
}

table {
	width: 100%;
	border-collapse: collapse;
	min-width: 620px;
}

th,
td {
	padding: 14px 16px;
	border-bottom: 1px solid var(--line);
	text-align: left;
}

th {
	color: #ffffff;
	background: #294a66;
}

tr:last-child td {
	border-bottom: 0;
}

.split-section {
	display: grid;
	grid-template-columns: minmax(300px, 0.85fr) minmax(360px, 1.15fr);
	gap: 34px;
	align-items: center;
}

.split-section.reverse {
	grid-template-columns: minmax(420px, 1.2fr) minmax(300px, 0.8fr);
}

.section-text {
	max-width: 650px;
}

.section-text p {
	color: var(--muted);
}

.check-list {
	display: grid;
	gap: 10px;
	padding: 0;
	margin: 24px 0 0;
	list-style: none;
}

.check-list li {
	padding: 12px 14px;
	border-left: 4px solid var(--green);
	border-radius: 6px;
	background: #ffffff;
	color: var(--ink);
}

.image-frame {
	overflow: hidden;
	border: 1px solid var(--line);
	border-radius: 8px;
	background: #ffffff;
	box-shadow: var(--shadow);
}

.image-frame img {
	width: 100%;
	background: #ffffff;
}

.results-image {
	background: #ffffff;
}

.chord-card {
	border-top: 5px solid var(--blue);
}

.chord-card:nth-child(2) {
	border-top-color: var(--green);
}

.chord-card:nth-child(3) {
	border-top-color: var(--gold);
}

.chord-card:nth-child(4) {
	border-top-color: var(--red);
}

.chord-card span {
	display: block;
	margin-bottom: 18px;
	color: var(--muted);
	font-size: 0.85rem;
	font-weight: 700;
}

.chord-card p {
	margin-bottom: 0;
	color: var(--muted);
	font-size: 1.25rem;
	font-weight: 700;
}

.result-list {
	display: grid;
	gap: 12px;
	margin-top: 24px;
}

.result-list div {
	padding: 14px;
	border: 1px solid var(--line);
	border-radius: 8px;
	background: #ffffff;
}

.result-list strong {
	display: block;
	margin-bottom: 4px;
	color: var(--blue);
}

.result-list span {
	color: var(--muted);
}

.module-grid {
	grid-template-columns: repeat(2, minmax(0, 1fr));
}

.download-row {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	margin-top: 28px;
}

.download-row a {
	padding: 12px 14px;
	border: 1px solid var(--line);
	border-radius: 7px;
	background: #ffffff;
	color: var(--blue);
	font-weight: 700;
}

.download-row a:hover {
	border-color: var(--blue);
}

.footer {
	padding: 28px 7vw;
	color: #ffffff;
	background: #17212b;
	text-align: center;
}

.footer p {
	margin: 0;
}

@media (max-width: 980px) {
	.hero,
	.split-section,
	.split-section.reverse {
		grid-template-columns: 1fr;
	}

	.hero {
		min-height: auto;
	}

	.hardware-grid,
	.chord-grid {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}

	.summary-strip {
		grid-template-columns: repeat(2, 1fr);
	}

	.summary-strip div:nth-child(2) {
		border-right: 0;
	}

	.summary-strip div:nth-child(1),
	.summary-strip div:nth-child(2) {
		border-bottom: 1px solid var(--line);
	}
}

@media (max-width: 680px) {
	.topbar {
		align-items: flex-start;
		flex-direction: column;
		gap: 10px;
		padding: 14px 18px;
	}

	.nav {
		flex-wrap: wrap;
	}

	.hero,
	.section {
		padding-left: 20px;
		padding-right: 20px;
	}

	.hero-panel {
		min-width: 0;
		padding: 18px;
	}

	.hardware-grid,
	.chord-grid,
	.module-grid,
	.summary-strip {
		grid-template-columns: 1fr;
	}

	.summary-strip div {
		border-right: 0;
		border-bottom: 1px solid var(--line);
	}

	.summary-strip div:last-child {
		border-bottom: 0;
	}

	.button {
		width: 100%;
	}
}

@media print {
	.topbar,
	.hero-actions,
	.download-row {
		display: none;
	}

	body {
		background: #ffffff;
	}

	.section,
	.hero {
		padding: 28px;
	}
}