/* ==========================================================================
   Erik Löffelholz — Research Portfolio
   Dark research-lab design system
   Tactical-telemetry aesthetic: monospace micro-typography, 1px grid
   compartmentalization, phosphor-on-CRT palette, single red accent.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design tokens
   -------------------------------------------------------------------------- */

:root {
    /* Substrate */
    --bg: #0a0a0c;
    --bg-panel: #0e0e11;
    --bg-raised: #131318;
    --bg-inset: #060608;

    /* Phosphor */
    --fg: #e8e8e4;
    --fg-dim: #a3a39c;
    --fg-mute: #6a6a63;

    /* Structure */
    --line: #222228;
    --line-strong: #32323a;

    /* Accent — aviation red, used sparingly */
    --red: #ff2a2a;
    --red-dim: rgba(255, 42, 42, 0.55);
    --red-faint: rgba(255, 42, 42, 0.12);

    /* Terminal green — reserved exclusively for live-status indicators */
    --green: #4af626;

    /* Type */
    --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

    /* Layout */
    --w-text: 760px;
    --w-wide: 1180px;
    --nav-h: 56px;
}

::selection {
    background: var(--red);
    color: #0a0a0c;
}

/* --------------------------------------------------------------------------
   Reset & base
   -------------------------------------------------------------------------- */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Keep anchor targets clear of the sticky nav */
[id] {
    scroll-margin-top: calc(var(--nav-h) + 1.25rem);
}

body {
    font-family: var(--sans);
    color: var(--fg);
    background: var(--bg);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Faint global grid texture */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(rgba(232, 232, 228, 0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(232, 232, 228, 0.018) 1px, transparent 1px);
    background-size: 56px 56px;
}

main {
    flex: 1;
    position: relative;
    z-index: 1;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--fg);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--red);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
    line-height: 1.25;
    font-weight: 700;
    color: var(--fg);
    letter-spacing: -0.01em;
}

h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5em;
    letter-spacing: -0.02em;
}

/* Content headings (markdown-rendered pages) */
.content h2 {
    font-size: 1.35rem;
    margin-top: 2.75em;
    margin-bottom: 0.8em;
    padding-bottom: 0.45em;
    border-bottom: 1px solid var(--line);
    position: relative;
}

.content h2::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 42px;
    height: 1px;
    background: var(--red);
}

.content h3 {
    font-size: 1.1rem;
    margin-top: 1.75em;
    margin-bottom: 0.5em;
}

.content h4 {
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--fg-mute);
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

p {
    margin-bottom: 1em;
}

.content p,
.content li {
    color: var(--fg-dim);
}

.content strong {
    color: var(--fg);
    font-weight: 600;
}

ul, ol {
    margin-bottom: 1em;
    padding-left: 1.5em;
}

li {
    margin-bottom: 0.3em;
}

blockquote {
    border-left: 2px solid var(--red);
    padding: 0.7em 1.2em;
    margin: 1.75em 0;
    color: var(--fg-dim);
    background: var(--bg-panel);
    font-family: var(--mono);
    font-size: 0.88em;
}

blockquote p:last-child {
    margin-bottom: 0;
}

hr {
    border: none;
    border-top: 1px solid var(--line);
    margin: 3em 0;
    position: relative;
}

hr::after {
    content: '+';
    position: absolute;
    top: -0.72em;
    left: -2px;
    color: var(--fg-mute);
    font-family: var(--mono);
    font-size: 0.8rem;
    background: var(--bg);
    padding-right: 0.5em;
}

code {
    font-family: var(--mono);
    font-size: 0.85em;
    background: var(--bg-raised);
    border: 1px solid var(--line);
    padding: 0.1em 0.4em;
    color: var(--fg);
}

pre {
    background: var(--bg-inset);
    border: 1px solid var(--line);
    padding: 1.1em 1.25em;
    overflow-x: auto;
    margin: 1.5em 0;
    line-height: 1.55;
}

pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.82rem;
}

/* Hugo/Chroma highlight wrapper */
.highlight {
    margin: 1.5em 0;
}

.highlight pre {
    margin: 0;
}

table {
    border-collapse: collapse;
    width: 100%;
    margin: 1.5em 0;
    font-size: 0.9rem;
}

th {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--fg-mute);
    text-align: left;
    padding: 0.5em 0.75em;
    border-bottom: 1px solid var(--line-strong);
}

td {
    padding: 0.5em 0.75em;
    border-bottom: 1px solid var(--line);
    color: var(--fg-dim);
}

/* Shared micro-label: uppercase mono tag used across components */
.mono-label {
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--fg-mute);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */

.container {
    max-width: var(--w-text);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.container-wide {
    max-width: var(--w-wide);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */

.site-nav {
    position: sticky;
    top: 0;
    background: rgba(10, 10, 12, 0.88);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
    z-index: 100;
    height: var(--nav-h);
}

.nav-container {
    max-width: var(--w-wide);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    font-family: var(--mono);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--fg);
}

.nav-logo .logo-mark {
    color: var(--red);
    margin-right: 0.5em;
}

.nav-logo:hover {
    color: var(--fg);
}

.nav-links {
    display: flex;
    gap: 1.9rem;
    align-items: center;
}

.nav-links a {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--fg-mute);
    position: relative;
    transition: color 0.15s ease;
}

.nav-links a .nav-index {
    color: var(--fg-mute);
    opacity: 0.6;
    margin-right: 0.35em;
}

.nav-links a:hover {
    color: var(--fg);
}

.nav-links a.active {
    color: var(--fg);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--red);
}

.external-icon {
    font-size: 0.85em;
    margin-left: 2px;
    opacity: 0.5;
}

/* Nav toggle (mobile) */
.nav-toggle-checkbox {
    display: none;
}

.nav-toggle-label {
    display: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle-label span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--fg);
    margin: 4px 0;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.site-footer {
    border-top: 1px solid var(--line);
    margin-top: 5rem;
    position: relative;
    z-index: 1;
    background: var(--bg-panel);
}

.footer-container {
    max-width: var(--w-wide);
    margin: 0 auto;
    padding: 0 1.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    font-family: var(--mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--fg-mute);
    flex-wrap: wrap;
    gap: 0.75rem;
}

.footer-links {
    display: flex;
    gap: 1.75rem;
}

.footer-links a {
    color: var(--fg-mute);
    font-family: var(--mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.footer-links a:hover {
    color: var(--fg);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn-primary,
.btn-secondary {
    display: inline-block;
    padding: 0.6rem 1.3rem;
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: all 0.15s ease;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    background: var(--fg);
    color: var(--bg);
    border: 1px solid var(--fg);
}

.btn-primary:hover {
    background: var(--red);
    border-color: var(--red);
    color: #fff;
}

.btn-secondary {
    background: transparent;
    color: var(--fg-dim);
    border: 1px solid var(--line-strong);
}

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

/* --------------------------------------------------------------------------
   Homepage — hero
   -------------------------------------------------------------------------- */

.hero {
    position: relative;
    border-bottom: 1px solid var(--line);
    overflow: hidden;
    background: var(--bg);
}

#hero-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.85;
}

.hero-inner {
    position: relative;
    z-index: 1;
    max-width: var(--w-wide);
    margin: 0 auto;
    padding: 5.5rem 1.5rem 4rem;
    pointer-events: none;
}

.hero-inner a,
.hero-inner button {
    pointer-events: auto;
}

.hero-meta {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--fg-mute);
    margin-bottom: 1.5rem;
}

.hero-meta .meta-accent {
    color: var(--red);
}

.hero-name {
    font-size: clamp(2.6rem, 7.5vw, 5.5rem);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: -0.035em;
    line-height: 0.95;
    margin-bottom: 1.75rem;
}

.hero-trajectory {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    font-family: var(--mono);
    font-size: 0.74rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.trajectory-node {
    color: var(--fg-dim);
    border: 1px solid var(--line-strong);
    padding: 0.4em 0.85em;
    background: rgba(10, 10, 12, 0.7);
}

.trajectory-node.active {
    color: var(--fg);
    border-color: var(--red);
    background: var(--red-faint);
}

.trajectory-arrow {
    color: var(--fg-mute);
    letter-spacing: -0.1em;
}

.hero-description {
    font-size: 1rem;
    line-height: 1.75;
    color: var(--fg-dim);
    max-width: 620px;
    margin-bottom: 2.25rem;
    background: rgba(10, 10, 12, 0.55);
}

.hero-links {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Telemetry strip under hero text */
.hero-telemetry {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--line);
    background: rgba(10, 10, 12, 0.82);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.telemetry-grid {
    max-width: var(--w-wide);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

.telemetry-cell {
    padding: 0.9rem 0;
    font-family: var(--mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.telemetry-cell + .telemetry-cell {
    padding-left: 1.25rem;
    border-left: 1px solid var(--line);
}

.telemetry-cell .t-key {
    color: var(--fg-mute);
    display: block;
    margin-bottom: 0.1rem;
}

.telemetry-cell .t-val {
    color: var(--fg);
    font-weight: 600;
}

.telemetry-cell .t-val .status-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--green);
    margin-right: 0.5em;
    vertical-align: middle;
    box-shadow: 0 0 6px rgba(74, 246, 38, 0.7);
}

/* --------------------------------------------------------------------------
   Homepage — section grid
   -------------------------------------------------------------------------- */

.home-section-label {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--fg-mute);
    margin-bottom: 2rem;
}

.home-section-label .label-index {
    color: var(--red);
    margin-right: 0.75em;
}

/* Homepage — skills & infrastructure stack */
.home-skills {
    padding: 4rem 0 0;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.skill-group {
    background: var(--bg-panel);
    padding: 1.6rem 1.75rem;
    transition: background 0.2s ease;
}

.skill-group:hover {
    background: var(--bg-raised);
}

.skill-group-label {
    display: flex;
    align-items: baseline;
    gap: 0.65em;
    font-family: var(--mono);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--fg);
    margin-bottom: 1.1rem;
}

.skill-group-label .sg-index {
    font-size: 0.66rem;
    color: var(--red);
    letter-spacing: 0.1em;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.skill-tags span {
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.03em;
    color: var(--fg-dim);
    background: var(--bg-inset);
    border: 1px solid var(--line);
    padding: 0.35em 0.7em;
    transition: border-color 0.15s ease, color 0.15s ease;
}

.skill-tags span:hover {
    border-color: var(--red-dim);
    color: var(--fg);
}

.home-sections {
    padding: 4rem 0;
}

.section-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.section-card {
    padding: 1.9rem;
    background: var(--bg-panel);
    transition: background 0.2s ease;
    position: relative;
    display: flex;
    flex-direction: column;
}

.section-card:hover {
    background: var(--bg-raised);
}

.section-card .card-index {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--fg-mute);
    letter-spacing: 0.1em;
    margin-bottom: 1.4rem;
}

.section-card:hover .card-index {
    color: var(--red);
}

.section-card h2 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.8em;
    text-transform: uppercase;
    letter-spacing: 0.01em;
}

.section-card p {
    font-size: 0.9rem;
    color: var(--fg-dim);
    line-height: 1.65;
    margin-bottom: 1.25em;
    flex: 1;
}

.card-link {
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--fg);
}

.card-link:hover {
    color: var(--red);
}

/* --------------------------------------------------------------------------
   Homepage — research directions
   -------------------------------------------------------------------------- */

.home-directions {
    padding: 4rem 0 4.5rem;
    background: var(--bg-panel);
    border-top: 1px solid var(--line);
}

.directions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.direction-item {
    padding: 1.4rem;
    background: var(--bg);
    transition: background 0.2s ease;
}

.direction-item:hover {
    background: var(--bg-raised);
}

.direction-marker {
    display: block;
    font-family: var(--mono);
    font-size: 0.68rem;
    color: var(--red);
    letter-spacing: 0.1em;
    margin-bottom: 0.8rem;
}

.direction-item h3 {
    font-size: 0.88rem;
    margin-bottom: 0.45em;
    font-weight: 600;
}

.direction-item p {
    font-size: 0.8rem;
    color: var(--fg-mute);
    line-height: 1.55;
    margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Homepage — recent writing
   -------------------------------------------------------------------------- */

.home-writing {
    padding: 4rem 0 1rem;
}

.writing-list {
    border: 1px solid var(--line);
}

.writing-row {
    display: grid;
    grid-template-columns: 130px 1fr auto;
    gap: 1.5rem;
    align-items: baseline;
    padding: 1.1rem 1.4rem;
    border-bottom: 1px solid var(--line);
    transition: background 0.15s ease;
}

.writing-row:last-child {
    border-bottom: none;
}

.writing-row:hover {
    background: var(--bg-raised);
}

.writing-row time {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--fg-mute);
    letter-spacing: 0.05em;
}

.writing-row .writing-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--fg);
}

.writing-row .writing-arrow {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--fg-mute);
}

.writing-row:hover .writing-arrow {
    color: var(--red);
}

/* --------------------------------------------------------------------------
   Page content (generic markdown pages)
   -------------------------------------------------------------------------- */

.page-content {
    padding: 3.5rem 0 4rem;
}

.page-header {
    margin-bottom: 2.75rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--line);
    position: relative;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 64px;
    height: 2px;
    background: var(--red);
}

.page-header .page-label {
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--fg-mute);
    margin-bottom: 0.9rem;
}

.page-header h1 {
    margin-bottom: 0.2em;
    text-transform: uppercase;
    font-size: clamp(1.7rem, 4vw, 2.4rem);
    letter-spacing: -0.02em;
}

.page-subtitle {
    font-size: 1rem;
    color: var(--fg-dim);
    margin-bottom: 0;
}

.content h2:first-of-type {
    margin-top: 0;
}

/* Post metadata (blog single pages) */
.post-meta {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.post-meta time {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--fg-mute);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.post-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    font-family: var(--mono);
    font-size: 0.66rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--fg-dim);
    background: var(--bg-raised);
    border: 1px solid var(--line);
    padding: 0.15em 0.6em;
}

/* Reading progress bar */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 0;
    background: var(--red);
    z-index: 200;
}

/* Table of contents */
.post-toc {
    border: 1px solid var(--line);
    background: var(--bg-panel);
    padding: 1.2rem 1.4rem;
    margin: 0 0 2.5rem;
    font-size: 0.85rem;
}

.post-toc summary {
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--fg-mute);
    cursor: pointer;
    list-style: none;
}

.post-toc summary::before {
    content: '[+] ';
    color: var(--red);
}

.post-toc[open] summary::before {
    content: '[-] ';
}

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

.post-toc nav {
    margin-top: 0.9rem;
}

.post-toc ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 0;
}

.post-toc ul ul {
    padding-left: 1.25rem;
}

.post-toc li {
    margin-bottom: 0.25em;
}

.post-toc a {
    color: var(--fg-dim);
    font-size: 0.85rem;
}

.post-toc a:hover {
    color: var(--fg);
}

/* --------------------------------------------------------------------------
   Projects page
   -------------------------------------------------------------------------- */

.projects-page .container {
    max-width: 900px;
}

/* Filter bar */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2.5rem;
}

.filter-btn {
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--fg-mute);
    background: transparent;
    border: 1px solid var(--line-strong);
    padding: 0.45em 0.9em;
    cursor: pointer;
    transition: all 0.15s ease;
}

.filter-btn:hover {
    color: var(--fg);
    border-color: var(--fg-mute);
}

.filter-btn.active {
    color: var(--fg);
    border-color: var(--red);
    background: var(--red-faint);
}

.project-section {
    margin-bottom: 3rem;
}

.project-section.is-hidden {
    display: none;
}

.section-heading {
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--fg-dim);
    margin-bottom: 1.25rem;
    padding-bottom: 0.6em;
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: baseline;
    gap: 0.75em;
}

.section-heading .heading-index {
    color: var(--red);
}

.project-card {
    border: 1px solid var(--line);
    background: var(--bg-panel);
    padding: 1.75rem 2rem;
    position: relative;
    transition: border-color 0.2s ease, background 0.2s ease;
    margin-bottom: 1.25rem;
}

.project-card:last-child {
    margin-bottom: 0;
}

.project-card:hover {
    border-color: var(--line-strong);
    background: var(--bg-raised);
}

.project-card.featured {
    border-left: 2px solid var(--red);
}

.project-card .project-id {
    position: absolute;
    top: 1.75rem;
    right: 2rem;
    font-family: var(--mono);
    font-size: 0.68rem;
    color: var(--fg-mute);
    letter-spacing: 0.1em;
}

.project-badges {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.9rem;
    flex-wrap: wrap;
}

.project-badge {
    display: inline-block;
    font-family: var(--mono);
    font-size: 0.64rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--fg-dim);
    border: 1px solid var(--line-strong);
    padding: 0.25em 0.7em;
}

.project-badge.live-badge {
    color: var(--green);
    border-color: rgba(74, 246, 38, 0.35);
}

.project-badge.live-badge::before {
    content: '';
    display: inline-block;
    width: 5px;
    height: 5px;
    background: var(--green);
    margin-right: 0.55em;
    vertical-align: middle;
    box-shadow: 0 0 5px rgba(74, 246, 38, 0.7);
}

.project-badge.core-badge {
    color: var(--red);
    border-color: var(--red-dim);
}

.project-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.6em;
    padding-right: 4rem;
}

.project-card > p {
    font-size: 0.92rem;
    color: var(--fg-dim);
    line-height: 1.65;
}

.project-highlights {
    margin: 1.25rem 0 1rem;
}

.project-highlights h4 {
    font-family: var(--mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--fg-mute);
    margin-bottom: 0.6em;
    font-weight: 600;
}

.project-highlights ul {
    list-style: none;
    padding-left: 0;
    margin-bottom: 0;
}

.project-highlights li {
    font-size: 0.87rem;
    color: var(--fg-dim);
    padding-left: 1.3em;
    position: relative;
    margin-bottom: 0.35em;
    line-height: 1.55;
}

.project-highlights li::before {
    content: '>';
    position: absolute;
    left: 0;
    top: 0;
    font-family: var(--mono);
    font-size: 0.8em;
    color: var(--red-dim);
    line-height: 1.9;
}

.project-block {
    margin: 1.25rem 0;
}

.project-block h4,
.tech-stack-label {
    font-family: var(--mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--fg-mute);
    margin-bottom: 0.5em;
    font-weight: 600;
}

.project-block h4 .blk-accent {
    color: var(--red);
    margin-right: 0.3em;
}

.project-block p {
    font-size: 0.9rem;
    color: var(--fg-dim);
    line-height: 1.6;
    margin-bottom: 0;
}

.tech-stack-label {
    margin-top: 1.25rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: 1rem 0;
}

.tech-stack-label + .project-tech {
    margin-top: 0;
}

.project-tech span {
    font-family: var(--mono);
    font-size: 0.66rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--fg-mute);
    background: var(--bg-inset);
    padding: 0.25em 0.6em;
    border: 1px solid var(--line);
}

.project-links {
    display: flex;
    gap: 0.5rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

.project-links .btn-primary,
.project-links .btn-secondary {
    font-size: 0.68rem;
    padding: 0.5rem 1rem;
}

/* Demo selector tabs */
.demo-selector {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--line);
}

.demo-tab {
    padding: 0.6rem 1.25rem;
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: none;
    border: 1px solid transparent;
    border-bottom: none;
    color: var(--fg-mute);
    cursor: pointer;
    transition: color 0.15s ease, background 0.15s ease;
    margin-bottom: -1px;
}

.demo-tab:hover {
    color: var(--fg);
    background: var(--bg-raised);
}

.demo-tab.active {
    color: var(--fg);
    background: var(--bg);
    border-color: var(--line);
    border-bottom-color: var(--bg);
}

.demo-frame-container {
    border: 1px solid var(--line);
    border-top: none;
    overflow: hidden;
    background: #000;
}

.demo-frame-container iframe,
.demo-container iframe {
    display: block;
    border: none;
}

.demo-container {
    margin: 2rem 0;
}

/* --------------------------------------------------------------------------
   Canvas page — embedded live simulation
   -------------------------------------------------------------------------- */

.canvas-intro {
    max-width: 760px;
    color: var(--fg-dim);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1.75rem;
}

.canvas-frame {
    position: relative;
    border: 1px solid var(--line);
    background: #05070d;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.canvas-frame iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* System readout overlay */
.readout {
    position: absolute;
    top: 0.9rem;
    right: 0.9rem;
    width: 220px;
    background: rgba(10, 10, 12, 0.85);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--line-strong);
    padding: 0.9rem 1rem;
    pointer-events: none;
}

.readout-title {
    font-family: var(--mono);
    font-size: 0.64rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--red);
    margin-bottom: 0.7rem;
}

.readout-grid {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    margin-bottom: 0.75rem;
}

.readout-grid > div {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 0.75rem;
}

.readout-grid dt {
    font-family: var(--mono);
    font-size: 0.62rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--fg-mute);
}

.readout-grid dd {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--fg);
    margin: 0;
    white-space: nowrap;
}

.readout-status {
    font-family: var(--mono);
    font-size: 0.62rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--fg-dim);
    margin: 0;
    padding-top: 0.6rem;
    border-top: 1px solid var(--line);
}

.readout-status .status-dot {
    margin-right: 0.5em;
}

.status-dot.is-off {
    background: var(--fg-mute);
    box-shadow: none;
}

.canvas-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

/* Technical stack toggle */
.canvas-stack {
    border: 1px solid var(--line);
    background: var(--bg-panel);
    padding: 1.2rem 1.4rem;
    margin-top: 2rem;
}

.canvas-stack summary {
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--fg-mute);
    cursor: pointer;
    list-style: none;
}

.canvas-stack summary::before {
    content: '[+] ';
    color: var(--red);
}

.canvas-stack[open] summary::before {
    content: '[-] ';
}

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

.canvas-stack-body {
    margin-top: 1rem;
}

.canvas-stack-body p {
    font-size: 0.88rem;
    color: var(--fg-dim);
    line-height: 1.65;
    max-width: 760px;
}

.canvas-stack-body pre {
    margin-bottom: 0;
    max-height: 480px;
    overflow: auto;
}

@media (max-width: 900px) {
    .canvas-frame {
        aspect-ratio: 4 / 5;
        max-height: 75vh;
    }

    .readout {
        top: 0.6rem;
        right: 0.6rem;
        width: 180px;
        padding: 0.7rem 0.8rem;
    }

    .readout-grid dd {
        font-size: 0.68rem;
    }
}

/* --------------------------------------------------------------------------
   Research page — trajectory timeline
   -------------------------------------------------------------------------- */

.timeline {
    border: 1px solid var(--line);
    background: var(--bg-panel);
    margin: 2rem 0 3rem;
}

.timeline-entry {
    display: grid;
    grid-template-columns: 170px 1fr;
    gap: 1.5rem;
    padding: 1.3rem 1.5rem;
    border-bottom: 1px solid var(--line);
    position: relative;
}

.timeline-entry:last-child {
    border-bottom: none;
}

.timeline-date {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--fg-mute);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding-top: 2px;
}

.timeline-body h3 {
    font-size: 0.98rem;
    font-weight: 700;
    margin: 0 0 0.25em;
}

.timeline-body p {
    font-size: 0.87rem;
    color: var(--fg-dim);
    margin-bottom: 0;
    line-height: 1.6;
}

.timeline-entry.timeline-next {
    background: var(--red-faint);
}

.timeline-entry.timeline-next .timeline-date {
    color: var(--red);
}

/* Publication entry */
.publication {
    border: 1px solid var(--line);
    border-left: 2px solid var(--red);
    background: var(--bg-panel);
    padding: 1.4rem 1.6rem;
    margin: 1.5rem 0;
}

.publication .pub-status {
    font-family: var(--mono);
    font-size: 0.66rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--red);
    margin-bottom: 0.7rem;
}

.publication .pub-authors {
    font-size: 0.88rem;
    color: var(--fg-dim);
    margin-bottom: 0.25em;
}

.publication .pub-authors strong {
    color: var(--fg);
}

.publication .pub-title {
    font-size: 1rem;
    font-weight: 600;
    font-style: italic;
    color: var(--fg);
    margin-bottom: 0.25em;
}

.publication .pub-venue {
    font-size: 0.85rem;
    color: var(--fg-mute);
    margin-bottom: 0;
}

/* Research topic cards */
.topic-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    margin: 1.75rem 0;
}

.topic-card {
    background: var(--bg-panel);
    padding: 1.4rem;
}

.topic-card:hover {
    background: var(--bg-raised);
}

.topic-card .topic-index {
    font-family: var(--mono);
    font-size: 0.66rem;
    color: var(--red);
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: 0.7rem;
}

.topic-card h3 {
    font-size: 0.92rem;
    font-weight: 600;
    margin: 0 0 0.4em;
}

.topic-card p {
    font-size: 0.83rem;
    color: var(--fg-dim);
    line-height: 1.6;
    margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Academic CV page
   -------------------------------------------------------------------------- */

.acv {
    max-width: 100%;
}

.acv-header {
    margin-bottom: 2.5rem;
    padding-bottom: 1.6rem;
    border-bottom: 1px solid var(--line-strong);
    position: relative;
}

.acv-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 64px;
    height: 2px;
    background: var(--red);
}

.acv-header h1 {
    font-size: clamp(1.7rem, 4vw, 2.4rem);
    text-transform: uppercase;
    margin-bottom: 0.6em;
}

.acv-contact {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.15rem 0;
    font-family: var(--mono);
    font-size: 0.76rem;
    color: var(--fg-dim);
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

.acv-contact span {
    white-space: nowrap;
}

.acv-contact span:not(:last-child)::after {
    content: '/';
    margin: 0 0.7em;
    color: var(--fg-mute);
}

.acv-contact a {
    color: var(--fg-dim);
}

.acv-contact a:hover {
    color: var(--red);
}

.acv-download {
    margin-top: 1rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
}

.acv-download-label {
    font-family: var(--mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--fg-mute);
    margin-right: 0.25rem;
}

.acv-download .btn-secondary {
    padding: 0.45rem 0.85rem;
    font-size: 0.66rem;
}

.acv-section {
    margin-bottom: 2.25rem;
}

.acv-section h2 {
    font-family: var(--mono);
    font-size: 0.74rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.13em;
    color: var(--fg);
    border-bottom: 1px solid var(--line);
    padding-bottom: 0.5em;
    margin-bottom: 1.1em;
    position: relative;
}

.acv-section h2::before {
    content: '/// ';
    color: var(--red);
}

.acv-section > p {
    font-size: 0.92rem;
    color: var(--fg-dim);
    line-height: 1.65;
}

.acv-entry {
    margin-bottom: 1.1rem;
}

.acv-entry-row {
    display: flex;
    gap: 1.5rem;
}

.acv-entry-date {
    width: 150px;
    min-width: 150px;
    font-family: var(--mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--fg-mute);
    padding-top: 3px;
}

.acv-entry-body {
    flex: 1;
}

.acv-entry-title {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--fg);
}

.acv-entry-inst {
    font-size: 0.88rem;
    color: var(--fg-dim);
}

.acv-entry-detail {
    font-size: 0.82rem;
    color: var(--fg-mute);
    margin-top: 0.2em;
}

.acv-entry-list {
    margin: 0.4rem 0 0 1.2rem;
    padding: 0;
}

.acv-entry-list li {
    font-size: 0.88rem;
    color: var(--fg-dim);
    margin-bottom: 0.2em;
}

.acv-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    margin-bottom: 0.5rem;
}

.acv-table thead th {
    text-align: left;
    font-family: var(--mono);
    font-weight: 600;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--fg-mute);
    border-bottom: 1px solid var(--line-strong);
    padding: 0.4em 0.6em;
}

.acv-table td {
    padding: 0.45em 0.6em;
    border-bottom: 1px solid var(--line);
    color: var(--fg-dim);
}

.acv-table th:nth-child(2), .acv-table td:nth-child(2),
.acv-table th:nth-child(3), .acv-table td:nth-child(3) {
    text-align: center;
    width: 60px;
}

.acv-table td strong {
    color: var(--red);
}

.acv-note {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--fg-mute);
    margin-top: 0.4rem;
    letter-spacing: 0.02em;
}

.acv-skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem 2rem;
}

.acv-skills-grid h3 {
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.25em;
    color: var(--fg);
}

.acv-skills-grid p {
    font-size: 0.88rem;
    color: var(--fg-dim);
    margin-bottom: 0;
    line-height: 1.55;
}

.acv-projects {
    margin-bottom: 0.5rem;
}

.acv-project-entry {
    font-size: 0.88rem;
    color: var(--fg-dim);
    margin-bottom: 0.65rem;
    line-height: 1.6;
}

.acv-project-entry strong {
    color: var(--fg);
}

.acv-project-entry a {
    font-family: var(--mono);
    font-size: 0.74rem;
    color: var(--fg-mute);
}

.acv-project-entry a:hover {
    color: var(--red);
}

/* --------------------------------------------------------------------------
   Blog list
   -------------------------------------------------------------------------- */

.post-list {
    margin-top: 1rem;
    border: 1px solid var(--line);
}

.post-preview {
    padding: 1.5rem 1.6rem;
    border-bottom: 1px solid var(--line);
    transition: background 0.15s ease;
    position: relative;
}

.post-preview:last-child {
    border-bottom: none;
}

.post-preview:hover {
    background: var(--bg-raised);
}

.post-preview .post-index {
    position: absolute;
    top: 1.5rem;
    right: 1.6rem;
    font-family: var(--mono);
    font-size: 0.68rem;
    color: var(--fg-mute);
    letter-spacing: 0.1em;
}

.post-preview h2 {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 0.3em 0 0.35em;
}

.post-preview h2 a {
    color: var(--fg);
}

.post-preview h2 a:hover {
    color: var(--red);
}

.post-preview p {
    font-size: 0.9rem;
    color: var(--fg-dim);
    margin-bottom: 0;
    line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Math (KaTeX overrides)
   -------------------------------------------------------------------------- */

.katex-display {
    margin: 1.75em 0;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 1em 0;
}

.katex {
    font-size: 1.05em;
}

/* --------------------------------------------------------------------------
   Keyboard focus
   -------------------------------------------------------------------------- */

:focus-visible {
    outline: 2px solid var(--red);
    outline-offset: 2px;
}

.nav-toggle-checkbox:focus-visible + .nav-toggle-label {
    outline: 2px solid var(--red);
    outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *, *::before, *::after {
        transition: none !important;
        animation: none !important;
    }
}

/* --------------------------------------------------------------------------
   Print — render light, hide chrome
   -------------------------------------------------------------------------- */

@media print {
    :root {
        --bg: #ffffff;
        --bg-panel: #ffffff;
        --bg-raised: #f4f4f0;
        --bg-inset: #f4f4f0;
        --fg: #111111;
        --fg-dim: #333333;
        --fg-mute: #666666;
        --line: #cccccc;
        --line-strong: #999999;
    }

    body::before,
    .site-nav,
    .site-footer,
    .progress-bar,
    #hero-canvas {
        display: none !important;
    }
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 900px) {
    .telemetry-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .telemetry-cell:nth-child(odd) {
        padding-left: 0;
        border-left: none;
    }

    .telemetry-cell {
        padding-top: 0.6rem;
        padding-bottom: 0.6rem;
    }

    .directions-grid {
        grid-template-columns: 1fr 1fr;
    }

    .section-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-inner {
        padding: 3.5rem 1.5rem 3rem;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .hero-description {
        font-size: 0.95rem;
    }

    .timeline-entry {
        grid-template-columns: 1fr;
        gap: 0.3rem;
    }

    .topic-grid {
        grid-template-columns: 1fr;
    }

    .writing-row {
        grid-template-columns: 1fr auto;
    }

    .writing-row time {
        display: none;
    }

    .acv-entry-row {
        flex-direction: column;
        gap: 0.15rem;
    }

    .acv-entry-date {
        width: auto;
        min-width: auto;
    }

    .acv-skills-grid {
        grid-template-columns: 1fr;
    }

    .acv-contact {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.2rem;
    }

    .acv-contact span:not(:last-child)::after {
        content: none;
    }

    .footer-content {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }

    /* Mobile nav */
    .nav-toggle-label {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-h);
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--line);
        flex-direction: column;
        align-items: stretch;
        padding: 0.5rem 1.5rem 1rem;
        gap: 0;
    }

    .nav-links a {
        padding: 0.8rem 0;
        border-bottom: 1px solid var(--line);
    }

    .nav-links a:last-child {
        border-bottom: none;
    }

    .nav-links a.active::after {
        display: none;
    }

    .nav-toggle-checkbox:checked ~ .nav-links {
        display: flex;
    }

    .nav-toggle-checkbox:checked ~ .nav-toggle-label span:nth-child(1) {
        transform: rotate(45deg) translate(4px, 4px);
    }

    .nav-toggle-checkbox:checked ~ .nav-toggle-label span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle-checkbox:checked ~ .nav-toggle-label span:nth-child(3) {
        transform: rotate(-45deg) translate(4px, -4px);
    }
}

@media (max-width: 480px) {
    .directions-grid {
        grid-template-columns: 1fr;
    }

    .telemetry-grid {
        grid-template-columns: 1fr;
    }

    .telemetry-cell {
        padding-left: 0 !important;
        border-left: none !important;
    }

    .project-card {
        padding: 1.4rem;
    }

    .project-card .project-id {
        display: none;
    }

    .project-card h3 {
        padding-right: 0;
    }

    h1 {
        font-size: 1.5rem;
    }
}