/* 
		.___                                   __    __          
	  __| _/______  ____   ____   ____   _____/  |__/  |_  ____  
	 / __ |\_  __ \/  _ \ /  _ \ / ___\_/ __ \   __\   __\/ __ \ 
	/ /_/ | |  | \(  <_> |  <_> ) /_/  >  ___/|  |  |  | \  ___/ 
	\____ | |__|   \____/ \____/\___  / \___  >__|  |__|  \___  >
		 \/                    /_____/      \/                \/ 
*/

:root {
	--bg:          #0b0b0c;
	--bg-subtle:   #111113;
	--surface:     #161619;
	--surface-hover:#1c1c21;
	--border:      rgba(255, 255, 255, 0.08);
	--border-focus:rgba(255, 255, 255, 0.22);
	--text:        #f3f3f4;
	--text-dim:    #9b9ba1;
	--text-muted:  #5c5c63;
	--accent:      #d4cfc5; /* Warm titanium / bone */
	--accent-glow: rgba(212, 207, 197, 0.12);

	--font-sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
	--font-serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
	--font-mono:  ui-monospace, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;

	--ease:       cubic-bezier(0.16, 1, 0.3, 1);
	--banner-h:   38px;
	--header-h:   68px;
}

/* Reset & defaults */
*, *::before, *::after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

html {
	scroll-behavior: smooth;
	background-color: var(--bg);
	color: var(--text);
	scroll-padding-top: calc(var(--banner-h) + var(--header-h) + 20px);
	-webkit-text-size-adjust: 100%;
}

body {
	font-family: var(--font-sans);
	font-size: 15px;
	line-height: 1.65;
	letter-spacing: -0.01em;
	background-color: var(--bg);
	color: var(--text);
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	min-height: 100vh;
}

::selection {
	background: var(--text);
	color: var(--bg);
}

/* Custom minimal scrollbar */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #232328; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #3b3b44; }

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

button, input {
	font: inherit;
	color: inherit;
	background: none;
	border: none;
}

:focus-visible {
	outline: 1px solid var(--text);
	outline-offset: 3px;
}

/* Layout container */
.container {
	width: min(1080px, calc(100% - 3.5rem));
	margin-inline: auto;
}

/* ============================================================
	 1. TOP BANNER
	 ============================================================ */
.top-banner {
	height: var(--banner-h);
	background: var(--bg-subtle);
	border-bottom: 1px solid var(--border);
	display: flex;
	align-items: center;
	justify-content: center;
	font-family: var(--font-mono);
	font-size: 11.5px;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--text-dim);
	position: relative;
	z-index: 50;
}

.top-banner-link {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	padding: 4px 12px;
	transition: color 0.25s var(--ease);
}

.top-banner-link:hover {
	color: var(--text);
}

.top-banner-link .indicator {
	width: 5px;
	height: 5px;
	border-radius: 50%;
	background-color: var(--text-dim);
	transition: background-color 0.25s, transform 0.25s var(--ease);
}

.top-banner-link:hover .indicator {
	background-color: var(--text);
	transform: scale(1.4);
}

.top-banner-link svg {
	width: 12px;
	height: 12px;
	stroke: currentColor;
	stroke-width: 1.5;
	fill: none;
	transition: transform 0.25s var(--ease);
}

.top-banner-link:hover svg {
	transform: translateX(3px);
}

/* ============================================================
	 2. TOP MENU / HEADER
	 ============================================================ */
.site-header {
	position: sticky;
	top: 0;
	z-index: 40;
	height: var(--header-h);
	background: rgba(11, 11, 12, 0.88);
	backdrop-filter: blur(14px);
	-webkit-backdrop-filter: blur(14px);
	border-bottom: 1px solid var(--border);
}

.header-inner {
	height: 100%;
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 2rem;
}

.brand {
	display: inline-flex;
	align-items: center;
	gap: 10px;
	font-size: 14px;
	font-weight: 500;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	transition: opacity 0.25s;
}

.brand:hover {
	opacity: 0.7;
}

.brand-dot {
	width: 7px;
	height: 7px;
	border: 1px solid var(--text);
	border-radius: 50%;
	transition: background-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.brand:hover .brand-dot {
	background-color: var(--text);
	transform: scale(1.2);
}

.main-nav {
	display: flex;
	align-items: center;
	gap: 2.2rem;
}

.nav-link {
	font-size: 13.5px;
	color: var(--text-dim);
	position: relative;
	padding-block: 6px;
	transition: color 0.25s var(--ease);
}

.nav-link::after {
	content: "";
	position: absolute;
	left: 0;
	bottom: 0;
	width: 100%;
	height: 1px;
	background-color: var(--text);
	transform: scaleX(0);
	transform-origin: right;
	transition: transform 0.3s var(--ease);
}

.nav-link:hover {
	color: var(--text);
}

.nav-link:hover::after {
	transform: scaleX(1);
	transform-origin: left;
}

.header-action {
	font-family: var(--font-mono);
	font-size: 11.5px;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--text);
	padding: 7px 14px;
	border: 1px solid var(--border);
	border-radius: 4px;
	transition: border-color 0.3s, background-color 0.3s, transform 0.3s var(--ease);
}

.header-action:hover {
	border-color: var(--border-focus);
	background-color: var(--surface);
	transform: translateY(-1px);
}

/* ============================================================
	 3. HERO / INTRO
	 ============================================================ */
.hero {
	padding-top: clamp(4rem, 10vw, 7.5rem);
	padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.hero-meta {
	font-family: var(--font-mono);
	font-size: 11.5px;
	letter-spacing: 0.18em;
	text-transform: uppercase;
	color: var(--text-muted);
	margin-bottom: 2rem;
	display: flex;
	align-items: center;
	gap: 12px;
}

.hero-meta::before {
	content: "";
	display: inline-block;
	width: 16px;
	height: 1px;
	background-color: var(--text-muted);
}

.hero-title {
	font-size: clamp(2.4rem, 5.8vw, 4.4rem);
	line-height: 1.08;
	font-weight: 400;
	letter-spacing: -0.035em;
	max-width: 17ch;
	margin-bottom: 1.8rem;
}

.hero-title em {
	font-family: var(--font-serif);
	font-style: italic;
	font-weight: 400;
	color: var(--accent);
}

.hero-lead {
	font-size: clamp(1.05rem, 1.6vw, 1.25rem);
	line-height: 1.6;
	color: var(--text-dim);
	max-width: 48ch;
	margin-bottom: 3rem;
	font-weight: 300;
}

.hero-actions {
	display: flex;
	align-items: center;
	gap: 1.2rem;
	flex-wrap: wrap;
}

.btn {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	font-size: 13.5px;
	padding: 10px 18px;
	border-radius: 4px;
	transition: all 0.25s var(--ease);
}

.btn svg {
	width: 14px;
	height: 14px;
	stroke: currentColor;
	stroke-width: 1.5;
	fill: none;
	transition: transform 0.25s var(--ease);
}

.btn:hover svg {
	transform: translateX(3px);
}

.btn-primary {
	background-color: var(--text);
	color: var(--bg);
	font-weight: 500;
}

.btn-primary:hover {
	background-color: #ffffff;
	transform: translateY(-1px);
	box-shadow: 0 4px 18px rgba(255, 255, 255, 0.08);
}

.btn-ghost {
	color: var(--text-dim);
	border: 1px solid var(--border);
}

.btn-ghost:hover {
	color: var(--text);
	border-color: var(--border-focus);
	background-color: var(--surface);
	transform: translateY(-1px);
}

/* Divider */
.rule {
	border: none;
	height: 1px;
	background-color: var(--border);
	margin-block: clamp(3rem, 6vw, 5rem);
}

/* ============================================================
	 4. CONTENT SECTIONS (The bulk of the page)
	 ============================================================ */

.section-label {
	display: flex;
	justify-content: space-between;
	align-items: baseline;
	padding-bottom: 1.2rem;
	border-bottom: 1px solid var(--border);
	margin-bottom: 2rem;
	font-family: var(--font-mono);
	font-size: 11px;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--text-muted);
}

.section-label span:last-child {
	color: var(--text-dim);
}

/* ---- A. SIBLING-DIMMING PROJECT LIST ---- */
.project-list {
	display: flex;
	flex-direction: column;
}

/* Libral CSS hover effect: Sibling dimming */
.project-list:hover .project-row:not(:hover) {
	opacity: 0.25;
	filter: blur(0.3px);
}

.project-row {
	display: grid;
	grid-template-columns: 80px 1.4fr 1fr 100px 32px;
	align-items: center;
	gap: 1.5rem;
	padding: 1.7rem 0.5rem;
	border-bottom: 1px solid var(--border);
	transition: opacity 0.35s var(--ease), filter 0.35s var(--ease), transform 0.3s var(--ease), background-color 0.3s var(--ease);
}

.project-row:hover {
	opacity: 1 !important;
	transform: translateX(8px);
	background-color: rgba(255, 255, 255, 0.015);
}

.project-id {
	font-family: var(--font-mono);
	font-size: 12px;
	color: var(--text-muted);
	transition: color 0.25s;
}

.project-row:hover .project-id {
	color: var(--text);
}

.project-name {
	font-size: 1.25rem;
	font-weight: 400;
	letter-spacing: -0.015em;
	color: var(--text);
	display: flex;
	align-items: center;
	gap: 10px;
}

.project-tag {
	font-size: 13px;
	color: var(--text-dim);
}

.project-year {
	font-family: var(--font-mono);
	font-size: 12px;
	color: var(--text-muted);
	text-align: right;
}

.project-arrow {
	color: var(--text-muted);
	display: grid;
	place-items: center;
	transition: color 0.25s, transform 0.25s var(--ease);
}

.project-arrow svg {
	width: 16px;
	height: 16px;
	stroke: currentColor;
	stroke-width: 1.5;
	fill: none;
}

.project-row:hover .project-arrow {
	color: var(--text);
	transform: translate(3px, -3px);
}

/* ---- B. PURE CSS FILTER TABS (ZERO JAVASCRIPT) ---- */
.filter-tabs {
	margin-top: 5rem;
}

.filter-controls {
	display: flex;
	gap: 8px;
	margin-bottom: 2.2rem;
	flex-wrap: wrap;
}

/* Hide the actual radio inputs */
.filter-radio {
	position: absolute;
	opacity: 0;
	pointer-events: none;
}

.filter-btn {
	font-family: var(--font-mono);
	font-size: 11.5px;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--text-muted);
	padding: 6px 14px;
	border: 1px solid var(--border);
	border-radius: 3px;
	cursor: pointer;
	transition: all 0.25s var(--ease);
	user-select: none;
}

.filter-btn:hover {
	color: var(--text);
	border-color: var(--border-focus);
}

/* CSS Radio checked styles */
#filter-all:checked ~ .filter-controls label[for="filter-all"],
#filter-i2p:checked ~ .filter-controls label[for="filter-i2p"],
#filter-freenet:checked ~ .filter-controls label[for="filter-freenet"],
#filter-linux:checked ~ .filter-controls label[for="filter-linux"], 
#filter-privacytech:checked ~ .filter-controls label[for="filter-privacytech"],
#filter-blockchains:checked ~ .filter-controls label[for="filter-blockchains"] {
	color: var(--text);
	background-color: var(--surface);
	border-color: var(--text);
}

/* CSS Filtering logic */
#filter-i2p:checked ~ .card-grid .card:not(.cat-i2p),
#filter-freenet:checked ~ .card-grid .card:not(.cat-freenet),
#filter-linux:checked ~ .card-grid .card:not(.cat-linux),
#filter-privacytech:checked ~ .card-grid .card:not(.cat-privacytech),
#filter-blockchains:checked ~ .card-grid .card:not(.cat-blockchains) {
	display: none;
}

.card-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 1.4rem;
}

.card {
	background-color: var(--surface);
	border: 1px solid var(--border);
	border-radius: 4px;
	padding: 1.8rem;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	min-height: 280px;
	position: relative;
	overflow: hidden;
	transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), background-color 0.35s var(--ease);
}

/* Subtle corner light sheen on hover */
.card::before {
	content: "";
	position: absolute;
	inset: 0;
	background: radial-gradient(380px circle at top left, var(--accent-glow), transparent 70%);
	opacity: 0;
	transition: opacity 0.4s var(--ease);
	pointer-events: none;
}

.card:hover {
	transform: translateY(-4px);
	border-color: var(--border-focus);
	background-color: var(--surface-hover);
}

.card:hover::before {
	opacity: 1;
}

.card-index {
	font-family: var(--font-mono);
	font-size: 11px;
	color: var(--text-muted);
	letter-spacing: 0.1em;
	margin-bottom: 2.4rem;
	display: block;
}

.card-title {
	font-size: 1.15rem;
	font-weight: 500;
	letter-spacing: -0.015em;
	margin-bottom: 0.6rem;
	color: var(--text);
	transition: color 0.25s;
}

.card:hover .card-title {
	color: #ffffff;
}

.card-desc {
	font-size: 13.5px;
	line-height: 1.6;
	color: var(--text-dim);
	font-weight: 300;
}

.card-foot {
	margin-top: 2rem;
	padding-top: 1.2rem;
	border-top: 1px solid var(--border);
	display: flex;
	justify-content: space-between;
	align-items: center;
	font-family: var(--font-mono);
	font-size: 11px;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--text-muted);
}

.card-foot svg {
	width: 14px;
	height: 14px;
	stroke: currentColor;
	stroke-width: 1.5;
	fill: none;
	transition: transform 0.25s var(--ease), color 0.25s;
}

.card:hover .card-foot svg {
	color: var(--text);
	transform: translateX(4px);
}

/* ---- C. pages / PHILOSOPHY ---- */
.pages {
	margin-top: 5rem;
}

.pages-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: clamp(2rem, 5vw, 4rem);
}

.principle-item {
	border-top: 1px solid var(--border);
	padding-top: 1.6rem;
	transition: transform 0.3s var(--ease);
}

.principle-item:hover {
	transform: translateY(-2px);
}

.principle-num {
	font-family: var(--font-mono);
	font-size: 11.5px;
	color: var(--text-muted);
	display: block;
	margin-bottom: 0.8rem;
	transition: color 0.25s;
}

.principle-item:hover .principle-num {
	color: var(--accent);
}

.principle-item h3 {
	font-size: 1.15rem;
	font-weight: 500;
	letter-spacing: -0.015em;
	margin-bottom: 0.6rem;
	color: var(--text);
}

.principle-item p {
	font-size: 14px;
	line-height: 1.65;
	color: var(--text-dim);
	font-weight: 300;
}

/* ---- D. PURE CSS ACCORDION (SPECIFICATIONS & NOTES) ---- */
.accordion-section {
	margin-top: 5rem;
}

.accordion {
	border-top: 1px solid var(--border);
}

.accordion details {
	border-bottom: 1px solid var(--border);
}

.accordion summary {
	list-style: none;
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 1.4rem 0.2rem;
	font-size: 14.5px;
	color: var(--text);
	transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
	user-select: none;
}

.accordion summary::-webkit-details-marker {
	display: none;
}

.accordion summary:hover {
	color: #ffffff;
	padding-left: 6px;
}

.accordion summary .sym {
	font-family: var(--font-mono);
	font-size: 13px;
	color: var(--text-muted);
	transition: transform 0.3s var(--ease), color 0.25s;
}

.accordion summary:hover .sym {
	color: var(--text);
}

.accordion details[open] summary .sym {
	transform: rotate(45deg);
	color: var(--text);
}

.accordion-body {
	padding: 0 0.2rem 1.6rem;
	font-size: 14px;
	line-height: 1.65;
	color: var(--text-dim);
	max-width: 60ch;
	font-weight: 300;
}

/* ============================================================
	 5. MINIMAL FOOTER
	 ============================================================ */
.site-footer {
	margin-top: clamp(5rem, 10vw, 8rem);
	border-top: 1px solid var(--border);
	padding-top: 3.5rem;
	padding-bottom: 3rem;
	background-color: var(--bg);
}

.footer-top {
	display: grid;
	grid-template-columns: 1.6fr 1fr 1fr 1fr;
	gap: 2.5rem;
	margin-bottom: 4rem;
}

.footer-col h4 {
	font-family: var(--font-mono);
	font-size: 11px;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--text-muted);
	margin-bottom: 1.2rem;
}

.footer-col p {
	font-size: 13px;
	line-height: 1.65;
	color: var(--text-dim);
	max-width: 28ch;
	font-weight: 300;
}

.footer-col ul {
	list-style: none;
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

.footer-col a {
	font-size: 13px;
	color: var(--text-dim);
	display: inline-flex;
	align-items: center;
	gap: 6px;
	transition: color 0.25s, transform 0.25s var(--ease);
}

.footer-col a:hover {
	color: var(--text);
	transform: translateX(3px);
}

.footer-bottom {
	border-top: 1px solid var(--border);
	padding-top: 2rem;
	display: flex;
	align-items: center;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 1.2rem;
	font-family: var(--font-mono);
	font-size: 11px;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--text-muted);
}

.footer-bottom a {
	color: var(--text-muted);
	transition: color 0.25s;
}

.footer-bottom a:hover {
	color: var(--text);
}

.to-top-btn {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	cursor: pointer;
	transition: color 0.25s;
}

.to-top-btn svg {
	width: 12px;
	height: 12px;
	stroke: currentColor;
	stroke-width: 1.5;
	fill: none;
	transition: transform 0.25s var(--ease);
}

.to-top-btn:hover svg {
	transform: translateY(-2px);
}

/* ============================================================
	 6. RESPONSIVE
	 ============================================================ */
@media (max-width: 860px) {
	.card-grid {
		grid-template-columns: 1fr 1fr;
	}
	.footer-top {
		grid-template-columns: 1fr 1fr;
	}
	.project-row {
		grid-template-columns: 60px 1fr 1fr 24px;
	}
	.project-year {
		display: none;
	}
}

@media (max-width: 620px) {
	.top-banner {
		font-size: 10.5px;
		padding-inline: 1rem;
		text-align: center;
	}
	.main-nav {
		display: none;
	}
	.pages-grid {
		grid-template-columns: 1fr;
	}
	.card-grid {
		grid-template-columns: 1fr;
	}
	.footer-top {
		grid-template-columns: 1fr;
	}
	.project-row {
		grid-template-columns: 44px 1fr 24px;
		gap: 0.8rem;
	}
	.project-tag {
		display: none;
	}
}