/* Day keeps the original palette. Night is a quieter version of the same green. */
:root {
  color-scheme: light;
  --surface: #fbfcf8;
  --surface-soft: #edf1e8;
  --surface-tint: #e9ede4;
  --accent-soft: #e3ecdf;
  --diagram-line: #b9cbb9;
  --diagram-dot: #aabdab;
  --diagram-ink: #52664c;
  --button-bg: #24594b;
  --button-ink: #ffffff;
  --button-hover: #173f34;
  --shadow: 0 8px 28px #20392c06;
  --nav-bg: #f6f5f0f5;
  --selection: #cbe2bd;
}

:root[data-theme="night"] {
  color-scheme: dark;
  --paper: #101b18;
  --ink: #e6ede5;
  --muted: #a8b9ae;
  --line: #30453a;
  --green: #a4d5b9;
  --mint: #203d30;
  --surface: #172720;
  --surface-soft: #1b2d24;
  --surface-tint: #182a22;
  --accent-soft: #243e2e;
  --diagram-line: #48664c;
  --diagram-dot: #49614c;
  --diagram-ink: #b0c4aa;
  --button-bg: #a4d5b9;
  --button-ink: #10251b;
  --button-hover: #c1e9cf;
  --shadow: 0 8px 28px #00000012;
  --nav-bg: #101b18f5;
  --selection: #375c43;
}

::selection { background: var(--selection); color: var(--ink); }
a:focus-visible, button:focus-visible { outline-color: var(--green); }
.button, .skip-link { background: var(--button-bg); color: var(--button-ink); }
.button:hover { background: var(--button-hover); }
.site-header { gap: 24px; }
.brand-dot { margin-inline-start: 4px; }
.site-header nav { margin-left: auto; gap: 22px; }
.site-header .nav-contact { border-color: var(--line); }
.theme-switch {
  flex-shrink: 0;
  display: flex;
  gap: 3px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
}
.theme-switch button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 40px;
  min-height: 36px;
  padding: 6px 9px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: 5px;
  background: transparent;
  cursor: pointer;
}
.theme-switch button > span[aria-hidden] { font-size: 18px; }
.theme-switch button:hover { color: var(--green); background: var(--surface-soft); }
.theme-switch button[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--green);
  border-color: var(--diagram-line);
}
.hero { padding-top: 66px; padding-bottom: 66px; }
.hero .system-visual { border-radius: 14px; box-shadow: var(--shadow); }
.system-visual.approach-visual { min-height: 0; padding-block: 26px; }
.approach-visual .diagram-top { font-size: 10px; margin-bottom: 24px; }
.approach-steps { --step-gap: 24px; list-style: none; padding: 0; margin: 0; width: 100%; display: grid; gap: var(--step-gap); }
.approach-steps .flow-node { position: relative; width: 100%; max-width: none; min-height: 68px; padding: 14px 16px; }
.approach-steps .node-icon { flex-shrink: 0; font-family: var(--mono); font-size: 11px; }
.approach-steps strong { line-height: 1.45; }
.approach-steps .flow-node:not(:last-child)::after { content: ''; position: absolute; left: 33px; top: 100%; width: 1px; height: var(--step-gap); background: var(--diagram-line); }
.approach-steps .flow-node:nth-last-child(2)::after { height: calc(var(--step-gap) * 2); }
.approach-steps .building-step { margin-top: var(--step-gap); background: var(--accent-soft); border-color: var(--green); }
.hero .button { border-radius: 7px; }
.focus-strip { border-color: var(--line); }
.section-nav-shell {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.section-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-block: 13px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.section-nav > .eyebrow { margin-right: 18px; font-size: 9px; }
.section-nav a {
  flex-shrink: 0;
  padding: 8px 16px;
  font-size: 12px;
  line-height: 1.5;
  border: 1px solid transparent;
  border-radius: 5px;
  color: var(--muted);
}
.section-nav a:hover { color: var(--ink); background: var(--surface-soft); }
.section-nav a[aria-current] { color: var(--green); background: var(--accent-soft); border-color: var(--diagram-line); }
section[id] { scroll-margin-top: 90px; }
.project-grid { gap: 28px; align-items: stretch; }
.project-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 12px 0;
  box-shadow: var(--shadow);
  transition: border-color .2s, transform .2s;
}
.project-card:hover { border-color: var(--diagram-line); transform: translateY(-3px); }
.project-card-coming-soon:hover { transform: none; border-color: var(--line); }
.project-visual-link, .project-visual { border-radius: 7px; }
.project-card .project-meta { margin: 23px 12px 13px; flex-wrap: wrap; }
.project-card h3 { margin: 0 12px 13px; font-size: 25px; }
.project-card > p { margin: 0 12px 20px; }
.project-card > .tags { margin: auto 12px 24px; }
.case-study-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--line);
  margin-inline: 12px;
  padding-block: 17px;
  font-size: 12px;
  color: var(--green);
}
.case-study-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.tag { color: var(--muted); background: var(--surface-soft); }
.status-label { display: inline-flex; align-items: center; justify-content: center; text-align: center; line-height: 1; min-height: 22px; padding: 6px 8px 4px; color: var(--muted); border-color: var(--line); }
.project-meta:has(.project-details) { flex-wrap: wrap; }
.project-details { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; }
.anpr-case .article-body > h2 { padding-top: 32px; margin-top: 48px; border-top: 1px solid var(--line); }
.anpr-case .article-body h3 { color: var(--green); }
.anpr-facts { margin-block: 32px; padding: 20px 24px; background: var(--accent-soft); border: 1px solid var(--line); border-radius: 7px; }
.anpr-facts ul { list-style: none; padding: 0; margin: 0; }
.anpr-facts li { margin: 0; padding-block: 10px; font-size: 15px; line-height: 1.6; }
.anpr-facts li + li { border-top: 1px solid var(--line); }
.status-label.badge-blue { color: #245c91; background: #e7f0fa; border-color: #b8cee5; }
.status-label.badge-amber { color: #73571c; background: #f0e8d6; border-color: #ded3b8; }
.status-label.badge-purple { color: #70469a; background: #f1eafa; border-color: #d3bee7; }
.status-label.badge-green { color: #256342; background: #e4f2e8; border-color: #afcfba; }
.status-label.badge-teal { color: #236975; background: #e1f1f3; border-color: #aed0d6; }
:root[data-theme="night"] .status-label.badge-blue { color: #a9cff4; background: #1c3047; border-color: #3f6082; }
:root[data-theme="night"] .status-label.badge-purple { color: #d3b5f0; background: #30223f; border-color: #65507d; }
:root[data-theme="night"] .status-label.badge-green { color: #a0dbb6; background: #1d3628; border-color: #426c52; }
:root[data-theme="night"] .status-label.badge-teal { color: #9edce5; background: #1b343a; border-color: #416c74; }
.home-experience { padding-top: 10px; }
.experience-timeline { border-left: 1px solid var(--diagram-line); padding-left: 28px; margin-left: 6px; }
.experience-timeline .experience-row {
  position: relative;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  gap: 48px;
  margin-bottom: 20px;
}
.experience-timeline .experience-row::before {
  content: '';
  position: absolute;
  top: 35px;
  left: -35px;
  width: 9px;
  height: 9px;
  background: var(--green);
  border: 2px solid var(--paper);
  border-radius: 50%;
}
.experience-row h3 { margin-top: 14px; line-height: 1.3; }
.experience-timeline p { font-size: 14px; }
.experience-timeline .small { font-size: 12px; margin-bottom: 0; }
.home-skills { padding-top: 0; }
.about-engineer { color: var(--green); }
.about-experience-layout { display: grid; grid-template-columns: 1fr 1.65fr; gap: 64px; }
.about-experience-layout h2 { margin-top: 18px; font-size: clamp(30px, 3vw, 40px); line-height: 1.2; }
.about-experience-copy { border-left: 1px solid var(--diagram-line); padding-left: 32px; }
.about-experience-copy p:last-child { margin-bottom: 0; }
.about-experience .experience-timeline { margin-top: 40px; }
.about-skills { padding-top: 0; }
.skills-grid { gap: 22px; }
.skill-group { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 25px; }
.skill-group h3 { font-size: 23px; line-height: 1.25; }
.skill-number { color: var(--muted); }
.skill-context { color: var(--green); background: var(--accent-soft); border-radius: 3px; line-height: 1.6; }
.approach-section { background: var(--surface-tint); border-color: var(--line); }
.principles > div { border-color: var(--line); }
.principles .mono, .note-icon { color: var(--muted); }
.notes-empty { padding: 28px; background: var(--surface); border: 1px solid var(--line); border-radius: 9px; }
.post-row { border-color: var(--line); }
.footer-bottom, .coordinate { color: var(--muted); }
.contact-primary, .placeholder { border-color: var(--diagram-line); }
.blog-empty { background: var(--surface-soft); border-color: var(--diagram-line); }
.blog-empty > .mono { color: var(--muted); }
.prose blockquote { border-color: var(--green); }

/* Diagrams also adapt: no bright illustration panels left behind at night. */
.system-visual { background-color: var(--surface-soft); background-image: radial-gradient(var(--diagram-dot) 1px, transparent 1px); border-color: var(--line); }
.diagram-top, .diagram-bottom, .flow-split, .node-label, .node-detail { color: var(--diagram-ink); }
.orbit { border-color: var(--diagram-line); opacity: .6; }
.flow-node { color: var(--ink); background: var(--surface); border-color: var(--diagram-line); }
.node-icon { color: var(--green); background: var(--accent-soft); border-color: var(--diagram-line); }
.flow-connector, .retrieval-line { background: var(--diagram-line); }
.flow-center { background: var(--accent-soft); border-color: var(--diagram-line); box-shadow: 0 0 0 5px var(--surface-soft); }
.flow-center > span:last-child { color: var(--diagram-ink); }
.crosshair { color: var(--green); }
.output-dot { background: var(--green); }
.retrieval { background-color: var(--surface-soft); color: var(--diagram-ink); background-image: radial-gradient(var(--diagram-dot) 1px, transparent 1px); }
.query-bubble, .data-sources > div { background: var(--surface); color: var(--diagram-ink); border-color: var(--diagram-line); }
.neutral { background: var(--surface-soft); }
.visual-arrow { background: var(--surface); color: var(--green); border-color: var(--diagram-line); }
:root[data-theme="night"] .status-label.badge-amber { color: #e4c88b; background: #342e1d; border-color: #635632; }
:root[data-theme="night"] .vision { background-color: #152d24; }
:root[data-theme="night"] .code-block { background: #0b1511; border: 1px solid var(--line); }

@media (max-width: 1050px) {
  .site-header { gap: 18px; }
  .site-header nav { gap: 18px; }
  .theme-label { display: none; }
  .site-header .nav-contact { margin-left: 0; }
  .skill-group { padding: 20px; }
}
@media (max-width: 760px) {
  .about-experience-layout { grid-template-columns: 1fr; gap: 18px; }
  .about-experience-copy { padding-left: 20px; font-size: 16px; }
  .site-header { height: auto; min-height: 90px; gap: 14px; padding-block: 20px; }
  .site-header nav { gap: 16px; }
  .hero { padding-top: 44px; padding-bottom: 44px; }
  .section-nav { gap: 4px; padding-block: 10px; }
  .section-nav > .eyebrow { display: none; }
  .section-nav a { padding: 8px 11px; font-size: 11px; }
  .project-card { padding: 9px 9px 0; }
  .project-card .project-meta { margin-inline: 9px; }
  .project-card h3, .project-card > p, .project-card > .tags, .case-study-link { margin-inline: 9px; }
  .project-card h3 { font-size: 24px; }
  .experience-timeline { padding-left: 20px; }
  .experience-timeline .experience-row { padding: 22px; gap: 20px; }
  .experience-timeline .experience-row::before { left: -27px; }
  .home-experience { padding-top: 0; }
  .home-skills { padding-top: 0; }
  .notes-empty { padding: 24px; }
}
@media (max-width: 540px) {
  .site-header { display: grid; grid-template-columns: 1fr auto; row-gap: 14px; padding-top: 18px; padding-bottom: 12px; }
  .site-header nav { grid-row: 2; grid-column: 1 / -1; justify-content: center; margin: 0; gap: 35px; }
  .theme-switch { grid-row: 1; grid-column: 2; }
  .theme-switch button { min-height: 38px; }
  .theme-label { display: inline; }
  .hero h1 { font-size: clamp(42px, 9vw, 55px); }
  .hero .system-visual { border-radius: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  .project-card { transition: none; }
  .project-card:hover { transform: none; }
}
@media (max-width: 360px) {
  .theme-label { display: none; }
  .theme-switch button { min-width: 36px; padding-inline: 6px; }
}