:root {
	--bg-primary: #0f1117;
	--bg-secondary: #161b26;
	--bg-tertiary: #1f2636;
	--text-primary: #f1f5f9;
	--text-secondary: #94a3b8;
	--text-muted: #64748b;
	--accent: #8b5cf6;
	--accent-hover: #7c3aed;
	--accent-glow: rgba(139, 92, 246, 0.25);
	--success: #10b981;
	--success-bg: rgba(16, 185, 129, 0.12);
	--warning: #f59e0b;
	--warning-bg: rgba(245, 158, 11, 0.12);
	--error: #ef4444;
	--error-bg: rgba(239, 68, 68, 0.12);
	--border: #2a3346;
	--radius-sm: 6px;
	--radius-md: 12px;
	--radius-lg: 16px;
	--font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
	--font-mono: 'JetBrains Mono', 'Fira Code', 'SFMono-Regular', Consolas, monospace;
}

@media (prefers-color-scheme: light) {
	:root {
		--bg-primary: #f8fafc;
		--bg-secondary: #ffffff;
		--bg-tertiary: #f1f5f9;
		--text-primary: #0f172a;
		--text-secondary: #475569;
		--text-muted: #94a3b8;
		--accent: #7c3aed;
		--accent-hover: #6d28d9;
		--accent-glow: rgba(124, 58, 237, 0.15);
		--success: #059669;
		--success-bg: rgba(5, 150, 105, 0.1);
		--warning: #d97706;
		--warning-bg: rgba(217, 119, 6, 0.1);
		--error: #dc2626;
		--error-bg: rgba(220, 38, 38, 0.1);
		--border: #e2e8f0;
	}
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	font-family: var(--font-sans);
	background-color: var(--bg-primary);
	color: var(--text-primary);
	line-height: 1.6;
	padding: 2rem 1rem;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	align-items: center;
}

.container {
	width: 100%;
	max-width: 860px;
	display: flex;
	flex-direction: column;
	gap: 1.5rem;
}

header {
	text-align: center;
	margin-bottom: 0.5rem;
}

header h1 {
	font-size: 1.85rem;
	font-weight: 700;
	letter-spacing: -0.025em;
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 0.6rem;
}

header p {
	color: var(--text-secondary);
	font-size: 0.95rem;
	margin-top: 0.35rem;
}

.badge-nip {
	background: var(--accent-glow);
	color: var(--accent);
	border: 1px solid var(--accent);
	font-size: 0.75rem;
	font-weight: 600;
	padding: 0.15rem 0.55rem;
	border-radius: 999px;
	vertical-align: middle;
}

.card {
	background-color: var(--bg-secondary);
	border: 1px solid var(--border);
	border-radius: var(--radius-lg);
	padding: 1.5rem;
	box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.tabs {
	display: flex;
	gap: 0.5rem;
	margin-bottom: 1.25rem;
	border-bottom: 1px solid var(--border);
	padding-bottom: 0.75rem;
	flex-wrap: wrap;
}

.tab-btn {
	background: transparent;
	border: 1px solid transparent;
	color: var(--text-secondary);
	font-family: var(--font-sans);
	font-size: 0.9rem;
	font-weight: 600;
	padding: 0.5rem 1rem;
	border-radius: var(--radius-sm);
	cursor: pointer;
	transition: all 0.2s ease;
}

.tab-btn:hover {
	color: var(--text-primary);
	background-color: var(--bg-tertiary);
}

.tab-btn.active {
	background-color: var(--accent-glow);
	color: var(--accent);
	border-color: var(--accent);
}

.input-group {
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
	margin-bottom: 1rem;
}

.label-row {
	display: flex;
	justify-content: space-between;
	align-items: center;
	flex-wrap: wrap;
	gap: 0.5rem;
}

label {
	font-size: 0.875rem;
	font-weight: 600;
	color: var(--text-secondary);
}

.link-btn {
	background: none;
	border: none;
	color: var(--accent);
	font-size: 0.825rem;
	font-weight: 600;
	cursor: pointer;
	text-decoration: underline;
	padding: 0.2rem;
}

.link-btn:hover {
	color: var(--accent-hover);
}

textarea, input[type="text"] {
	width: 100%;
	background-color: var(--bg-tertiary);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	color: var(--text-primary);
	font-family: var(--font-mono);
	font-size: 0.85rem;
	padding: 0.875rem;
	transition: border-color 0.2s, box-shadow 0.2s;
	outline: none;
}

textarea {
	min-height: 220px;
	resize: vertical;
	line-height: 1.5;
}

textarea:focus, input[type="text"]:focus {
	border-color: var(--accent);
	box-shadow: 0 0 0 3px var(--accent-glow);
}

.relay-row {
	display: flex;
	gap: 0.5rem;
	margin-top: 0.5rem;
}

.actions {
	display: flex;
	gap: 0.75rem;
	flex-wrap: wrap;
	margin-top: 0.5rem;
}

.btn-primary {
	background-color: var(--accent);
	color: #ffffff;
	border: none;
	border-radius: var(--radius-md);
	padding: 0.75rem 1.5rem;
	font-size: 0.95rem;
	font-weight: 600;
	cursor: pointer;
	transition: background-color 0.2s, transform 0.1s;
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
}

.btn-primary:hover {
	background-color: var(--accent-hover);
}

.btn-primary:active {
	transform: scale(0.98);
}

.btn-primary:disabled {
	opacity: 0.6;
	cursor: not-allowed;
}

.btn-secondary {
	background-color: var(--bg-tertiary);
	color: var(--text-primary);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: 0.75rem 1.25rem;
	font-size: 0.9rem;
	font-weight: 600;
	cursor: pointer;
	transition: background-color 0.2s;
}

.btn-secondary:hover {
	background-color: var(--border);
}

.hidden {
	display: none !important;
}

/* Status Banner */
.status-banner {
	padding: 0.875rem 1rem;
	border-radius: var(--radius-md);
	font-size: 0.9rem;
	font-weight: 500;
	display: flex;
	align-items: center;
	gap: 0.6rem;
	margin-bottom: 1.25rem;
}

.status-banner.success {
	background-color: var(--success-bg);
	color: var(--success);
	border: 1px solid var(--success);
}

.status-banner.warning {
	background-color: var(--warning-bg);
	color: var(--warning);
	border: 1px solid var(--warning);
}

.status-banner.error {
	background-color: var(--error-bg);
	color: var(--error);
	border: 1px solid var(--error);
}

/* Metrics Grid */
.metrics-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
	gap: 1rem;
	margin-bottom: 1.5rem;
}

.metric-box {
	background-color: var(--bg-tertiary);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: 1rem;
	display: flex;
	flex-direction: column;
	gap: 0.25rem;
}

.metric-label {
	font-size: 0.75rem;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--text-secondary);
	font-weight: 600;
}

.metric-value {
	font-family: var(--font-mono);
	font-size: 1.35rem;
	font-weight: 700;
	color: var(--text-primary);
	word-break: break-all;
}

.metric-sub {
	font-size: 0.78rem;
	color: var(--text-muted);
}

/* Detail Rows */
.detail-section {
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.detail-item {
	background-color: var(--bg-tertiary);
	border: 1px solid var(--border);
	border-radius: var(--radius-md);
	padding: 0.875rem 1rem;
}

.detail-header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 0.4rem;
}

.detail-title {
	font-size: 0.8rem;
	font-weight: 600;
	color: var(--text-secondary);
	text-transform: uppercase;
	letter-spacing: 0.04em;
}

.badge {
	font-size: 0.72rem;
	font-weight: 700;
	padding: 0.15rem 0.5rem;
	border-radius: var(--radius-sm);
	text-transform: uppercase;
}

.badge.valid {
	background-color: var(--success-bg);
	color: var(--success);
}

.badge.invalid {
	background-color: var(--error-bg);
	color: var(--error);
}

.badge.neutral {
	background-color: var(--bg-secondary);
	color: var(--text-secondary);
	border: 1px solid var(--border);
}

.mono-block {
	font-family: var(--font-mono);
	font-size: 0.82rem;
	word-break: break-all;
	color: var(--text-primary);
}

/* Binary Bit Visualizer */
.bit-visualizer {
	display: flex;
	flex-wrap: wrap;
	gap: 3px;
	margin-top: 0.5rem;
}

.bit-box {
	width: 18px;
	height: 22px;
	display: flex;
	align-items: center;
	justify-content: center;
	font-family: var(--font-mono);
	font-size: 0.72rem;
	font-weight: 700;
	border-radius: 4px;
	background-color: var(--bg-secondary);
	border: 1px solid var(--border);
	color: var(--text-muted);
}

.bit-box.zero-leading {
	background-color: var(--success-bg);
	border-color: var(--success);
	color: var(--success);
}

.bit-box.first-one {
	background-color: var(--accent-glow);
	border-color: var(--accent);
	color: var(--accent);
}

.spinner {
	width: 16px;
	height: 16px;
	border: 2px solid rgba(255, 255, 255, 0.3);
	border-radius: 50%;
	border-top-color: #fff;
	animation: spin 0.8s linear infinite;
	display: inline-block;
}

@keyframes spin {
	to { transform: rotate(360deg); }
}
/*
footer {
	margin-top: auto;
	padding-top: 2rem;
	text-align: center;
	font-size: 0.8rem;
	color: var(--text-muted);
}
*/
/* ---------- Footer ---------- */

footer {
	border-top: 1px solid var(--border);
	padding: 0.8rem 1rem;
	display: flex;
	justify-content: center;
	gap: 1rem;
	font-size: 0.8rem;
	color: var(--muted);
}

footer a {
	color: var(--accent);
	text-decoration: none;
}

footer a:hover {
	text-decoration: underline;
}