:root {
  --bg-color: #f4f4f5;
  --text-main: #18181b;
  --text-muted: #52525b;
  --accent: #27272a;
  --border-color: #e4e4e7;

  --bg-elevated: #ffffff;
  --font-sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  --sidebar-width: 400px;
  --column-gap: 5rem;
  --max-content-width: 640px;
  --page-max-width: calc(var(--sidebar-width) + var(--column-gap) + var(--max-content-width));
  --gutter: max(0px, calc((100vw - var(--page-max-width)) / 2));
  --transition: 200ms ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg-color);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--bg-color);
  padding: 0.75rem 1.25rem;
  z-index: 100;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* ---------- Sidebar ---------- */

.sidebar {
  position: fixed;
  top: 0;
  left: var(--gutter);
  width: var(--sidebar-width);
  height: 100vh;
  padding: 3rem 2.5rem;
  display: flex;
  align-items: flex-start;
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  width: 100%;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.brand-name {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
}

.brand-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.brand-tagline {
  margin-top: 1.25rem;
  font-size: 0.85rem;
  font-style: italic;
  line-height: 1.6;
  color: var(--text-muted);
  max-width: 22rem;
}

.nav ul {
  list-style: none;
  margin: 3rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.nav a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--transition);
}

.nav a:hover,
.nav a:focus-visible,
.nav a.active {
  color: var(--text-main);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-main);
  font-weight: 500;
}

.sidebar-bottom {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.mobile-contact {
  display: none;
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.contact-list a {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.contact-list a:hover,
.contact-list a:focus-visible {
  color: var(--text-main);
}

.contact-list svg {
  flex-shrink: 0;
  color: var(--accent);
}

.social-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.4rem;
}

.social-list a {
  color: var(--text-muted);
  transition:
    color var(--transition),
    transform var(--transition);
  display: inline-flex;
}

.social-list a:hover,
.social-list a:focus-visible {
  color: var(--text-main);
  transform: translateY(-2px);
}

/* ---------- Reticle (hover-reveal corner marks) ---------- */

.reticle {
  position: relative;
}

.reticle::before,
.reticle::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  opacity: 0;
  transition:
    opacity var(--transition),
    transform var(--transition);
  pointer-events: none;
}

.reticle::before {
  top: 7px;
  left: 7px;
  border-top: 1.5px solid var(--accent);
  border-left: 1.5px solid var(--accent);
  transform: translate(5px, 5px);
}

.reticle::after {
  bottom: 7px;
  right: 7px;
  border-bottom: 1.5px solid var(--accent);
  border-right: 1.5px solid var(--accent);
  transform: translate(-5px, -5px);
}

.reticle:hover::before,
.reticle:hover::after,
.reticle:focus-within::before,
.reticle:focus-within::after {
  opacity: 1;
  transform: translate(0, 0);
}

/* ---------- Main content ---------- */

.site-main {
  margin-left: calc(var(--sidebar-width) + var(--column-gap) + var(--gutter));
  min-height: 100vh;
}

.content-inner {
  width: 100%;
  max-width: var(--max-content-width);
  padding: 3rem 4rem 6rem;
}

.section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border-color);
  scroll-margin-top: 2rem;
}

body.js-ready .section {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

body.js-ready .section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  body.js-ready .section {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

.hero {
  padding-top: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.hero-sub {
  font-size: clamp(1.3rem, 3vw, 2rem);
  color: var(--text-main);
  font-weight: 600;
  margin: 0 0 1.75rem;
  letter-spacing: -0.01em;
  max-width: 34rem;
}

.hero-body {
  max-width: 34rem;
  margin: 0;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 1.7rem;
  color: var(--text-main);
  font-weight: 700;
  margin: 0 0 2.5rem;
  letter-spacing: -0.01em;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* ---------- Skills ---------- */

.skills-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.5rem;
  max-width: 30rem;
}

.skills-grid li {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1.1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
  transition:
    border-color var(--transition),
    transform var(--transition);
}

.skills-grid li:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.skills-grid svg {
  flex-shrink: 0;
  color: var(--accent);
}

.skills-grid img {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  object-fit: contain;
}

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

.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.75rem 2rem;
  transition:
    border-color var(--transition),
    transform var(--transition),
    box-shadow var(--transition);
}

.project-card-link {
  display: block;
}

.project-card-cta {
  display: inline-block;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.35rem 0.75rem;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 12px 24px -18px rgba(24, 24, 27, 0.35);
}

.project-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.6rem;
}

.project-card h3 {
  margin: 0;
  color: var(--text-main);
  font-size: 1.15rem;
  font-weight: 700;
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  white-space: nowrap;
}

.project-card p {
  margin: 0;
}

/* ---------- Certifications ---------- */

.cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  max-width: 34rem;
}

.cert-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.1rem 1.4rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: border-color var(--transition);
}

.cert-item:hover {
  border-color: var(--accent);
}

.cert-status {
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  margin-top: 0.4rem;
}

.cert-done {
  background: var(--accent);
}

.cert-progress {
  background: transparent;
  border: 2px solid var(--accent);
}

.cert-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.cert-name {
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.98rem;
}

.cert-state {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

.footer {
  padding-top: 3rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.footer-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
}

.footer-credit {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin: -0.75rem 0 0;
}

.footer-credit a {
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition);
}

.footer-credit a:hover,
.footer-credit a:focus-visible {
  color: var(--text-main);
}

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

@media (max-width: 1024px) {
  :root {
    --sidebar-width: 320px;
  }

  .content-inner {
    padding: 3rem 2.5rem 6rem;
  }
}

@media (max-width: 800px) {
  .sidebar {
    position: static;
    left: auto;
    top: auto;
    width: auto;
    height: auto;
    padding: 3rem 1.5rem 0;
  }

  .sidebar-inner {
    display: block;
    height: auto;
  }

  .sidebar-top {
    margin-bottom: 2.5rem;
  }

  .nav {
    display: none;
  }

  .sidebar-bottom {
    display: none;
  }

  .mobile-contact {
    display: flex;
    flex-direction: column;
    gap: 1.4rem;
    margin-top: 3rem;
  }

  .site-main {
    margin-left: 0;
  }

  .content-inner {
    padding: 0 1.5rem 5rem;
  }

  .skills-grid {
    grid-template-columns: 1fr;
    max-width: none;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }

  .section {
    padding: 2.5rem 0;
  }

  .project-card {
    padding: 1.4rem 1.4rem;
  }

  .project-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

/* ---------- Card-listing pages (websites, homelab) ---------- */

.listing-page {
  max-width: 960px;
  margin: 0 auto;
  padding: 4rem 2.5rem 6rem;
}

.listing-header {
  margin-bottom: 3rem;
}

.back-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  transition: color var(--transition);
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--text-main);
}

.listing-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}

.listing-intro {
  max-width: 40rem;
  margin: 0;
  color: var(--text-muted);
}

.listing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.75rem;
}

.listing-card {
  display: block;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  transition:
    border-color var(--transition),
    transform var(--transition),
    box-shadow var(--transition);
}

.listing-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 12px 24px -18px rgba(24, 24, 27, 0.35);
}

.listing-preview {
  display: block;
  line-height: 0;
  border-bottom: 1px solid var(--border-color);
}

.listing-preview svg,
.listing-preview img {
  width: 100%;
  height: auto;
  display: block;
}

.listing-grid--single {
  grid-template-columns: 1fr;
  max-width: 700px;
}

.listing-card-body {
  padding: 1.5rem 1.75rem;
}

.listing-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.listing-card-header h2 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.listing-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.listing-card-body p {
  margin: 0;
}

@media (max-width: 720px) {
  .listing-page {
    padding: 3rem 1.5rem 4rem;
  }

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

/* ---------- Blog-style article pages ---------- */

.blog-page {
  max-width: 700px;
  margin: 0 auto;
  padding: 4rem 2.5rem 6rem;
}

.blog-header {
  margin-bottom: 2.5rem;
}

.blog-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.blog-title {
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}

.blog-lede {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin: 0;
  max-width: 36rem;
}

.blog-cover {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 3rem 2rem;
  margin-bottom: 2.5rem;
  color: var(--accent);
}

.blog-body p {
  margin: 0 0 1.25rem;
}

.blog-body h2 {
  font-size: 1.25rem;
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 2.25rem 0 1rem;
}

.blog-body ul {
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
}

.blog-body li {
  margin-bottom: 0.4rem;
}

.blog-body strong {
  color: var(--text-main);
}

.blog-footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

@media (max-width: 720px) {
  .blog-page {
    padding: 3rem 1.5rem 4rem;
  }
}