/* ============================================================
   Jaron Lu — Editorial / Magazine theme
   Bright, minimal black-white-gray with a single editorial accent
   ============================================================ */
@import url("https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,500;0,9..144,600;1,9..144,500&family=Noto+Serif+SC:wght@500;600;700&family=Noto+Sans+SC:wght@400;500&display=swap");

/* ============================================================
   Palette & tokens
   ============================================================ */
:root {
  --md-primary-fg-color: #16150f;
  --md-accent-fg-color: #c8402f;

  --paper: #fbfaf6;
  --paper-2: #f3f1ea;
  --card: #ffffff;
  --ink: #17160f;
  --ink-soft: #3a3a32;
  --muted: #6c6a60;
  --faint: #747160;
  --line: #e4e1d6;
  --line-strong: #17160f;
  --accent: #c8402f;
  --footer-bg: #16150f;
  --footer-meta-bg: #100f0b;
  --footer-fg: #fbfaf6;

  --display: "Fraunces", "Noto Serif SC", Georgia, "Songti SC", serif;
  --sans: "Inter", "Noto Sans SC", -apple-system, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  --shell: min(1180px, 90vw);
  --gutter: max(5vw, calc((100vw - 1180px) / 2));
}

/* keep Material body font in sync */
[data-md-color-scheme="default"] {
  --md-text-font-family: var(--sans);
  --md-code-font-family: var(--mono);
}

[data-md-color-scheme="slate"] {
  --md-hue: 210;
  --md-default-bg-color: #100f0c;
  --md-default-fg-color: #ece9df;
  --md-default-fg-color--light: #b0ada3;
  --md-default-fg-color--lighter: #74716a;
  --md-code-bg-color: #1a1915;
  --md-text-font-family: var(--sans);
  --md-code-font-family: var(--mono);

  --paper: #100f0c;
  --paper-2: #1a1814;
  --card: #17150f;
  --ink: #f0ede3;
  --ink-soft: #cfccc2;
  --muted: #9d9a90;
  --faint: #8a8778;
  --line: #2b2922;
  --line-strong: #f0ede3;
  --accent: #f26a52;
  --footer-bg: #1a1814;
  --footer-meta-bg: #141310;
  --footer-fg: #ece9df;
}

html {
  font-size: 125%;
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
}

/* ============================================================
   Header & navigation tabs
   ============================================================ */
.md-header {
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  color: var(--ink);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--line);
  box-shadow: none;
}

.md-tabs {
  background: transparent;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.md-header__title {
  font-family: var(--display);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
}

.md-header__button,
.md-tabs__link {
  color: var(--ink);
}

.md-tabs__link {
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  opacity: 0.62;
  transition: color 140ms ease, opacity 140ms ease;
}

.md-tabs__item--active .md-tabs__link,
.md-tabs__link:hover {
  color: var(--accent);
  opacity: 1;
}

.md-search__form {
  border-radius: 999px;
  background: color-mix(in srgb, var(--ink) 7%, transparent);
}

[data-md-color-scheme="slate"] .md-search__form {
  background: rgba(255, 255, 255, 0.08);
}

/* ============================================================
   Content shell & base typography
   ============================================================ */
.md-main__inner {
  margin-top: 0;
}

.md-main__inner:has(.masthead) {
  max-width: none;
}

.md-content__inner {
  padding-top: 2.4rem;
}

.md-content__inner:before {
  display: none;
}

.md-typeset {
  color: var(--ink-soft);
  font-size: 0.8rem;
  line-height: 1.75;
}

.md-typeset h1,
.md-typeset h2,
.md-typeset h3,
.md-typeset h4 {
  color: var(--ink);
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.md-typeset h1 {
  margin-bottom: 1.4rem;
  font-size: 2.6rem;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.md-typeset h2 {
  margin-top: 2.8rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 1.55rem;
}

.md-typeset h3 {
  font-size: 1.1rem;
}

.md-typeset a {
  color: var(--accent);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.md-typeset table:not([class]) {
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  font-size: 0.76rem;
  box-shadow: none;
}

.md-typeset table:not([class]) th {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: var(--paper-2);
}

.md-typeset table:not([class]) td,
.md-typeset table:not([class]) th {
  border-color: var(--line);
}

.md-typeset table:not([class]) tr:hover {
  background: color-mix(in srgb, var(--accent) 5%, transparent);
}

.md-typeset code {
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.82em;
  background: var(--paper-2);
}

.md-typeset pre > code {
  border-radius: 6px;
}

.md-typeset .admonition,
.md-typeset details {
  border-radius: 6px;
  border-width: 1px;
  border-left-width: 3px;
  font-size: 0.76rem;
  box-shadow: none;
}

.md-typeset hr {
  border-bottom-color: var(--line);
}

/* Left nav / TOC accents */
.md-nav__title {
  font-family: var(--display);
}

.md-nav__link--active,
.md-nav__item .md-nav__link--active {
  color: var(--accent);
  font-weight: 600;
}

.md-typeset .md-content__button {
  color: var(--faint);
}

/* ============================================================
   Shared: full-bleed section + kicker
   ============================================================ */
.masthead,
.lens,
.notes {
  position: relative;
  left: 50%;
  box-sizing: border-box;
  width: 100vw;
  max-width: none;
  margin-left: -50vw;
  padding: 3.2rem var(--gutter);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.kicker.accent {
  color: var(--accent);
}

.kicker.accent:before {
  width: 1.8rem;
  height: 1px;
  background: currentColor;
  content: "";
}

/* Section heads */
.feature-head {
  margin-bottom: 2rem;
}

.md-typeset .feature-head h2 {
  max-width: none;
  margin: 0.9rem 0 0;
  padding: 0;
  border: 0;
  font-family: var(--display);
  font-size: 2.25rem;
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.feature-head p {
  max-width: 46ch;
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.7;
}

/* ============================================================
   MASTHEAD (hero)
   ============================================================ */
.masthead {
  padding-top: 2.2rem;
  padding-bottom: 2.55rem;
  border-bottom: 1px solid var(--line-strong);
  background: var(--paper);
}

.masthead-rule {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.masthead-meta {
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--faint);
  text-transform: uppercase;
}

.md-typeset .masthead-name {
  margin: 1.3rem 0 0;
  font-family: var(--sans);
  font-size: 5.1rem;
  font-weight: 400;
  line-height: 0.92;
  letter-spacing: 0;
  color: var(--ink);
}

.masthead-deck {
  max-width: 27ch;
  margin: 1.3rem 0 0;
  font-family: var(--sans);
  font-size: 1.65rem;
  font-weight: 500;
  line-height: 1.32;
  letter-spacing: 0;
  color: var(--ink);
}

.masthead-deck em {
  font-style: normal;
  font-weight: 600;
  color: var(--accent);
}

.masthead-foot {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: end;
  gap: 2rem 3rem;
  margin-top: 1.6rem;
  padding-top: 1.3rem;
  border-top: 1px solid var(--line);
}

.masthead-intro {
  max-width: 52ch;
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.7;
}

.masthead-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-self: end;
}

.md-typeset .btn-primary,
.md-typeset .btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.75rem 1.35rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  border-radius: 999px;
  transition: transform 160ms ease, background-color 160ms ease,
    border-color 160ms ease, color 160ms ease;
}

.md-typeset .btn-primary {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
}

.md-typeset .btn-primary:hover {
  transform: translateY(-2px);
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.md-typeset .btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line-strong);
}

.md-typeset .btn-ghost:hover {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary span,
.btn-ghost span {
  transition: transform 160ms ease;
}

.md-typeset .btn-primary:hover span,
.md-typeset .btn-ghost:hover span {
  transform: translateX(3px);
}

/* ============================================================
   ENGINEERING LENS — feature columns
   ============================================================ */
.lens {
  background: var(--paper-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.lens-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2.4rem;
}

.lens-grid article {
  display: flex;
  flex-direction: column;
  padding-top: 1.4rem;
  border-top: 2px solid var(--line-strong);
}

.lens-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--accent);
}

.md-typeset .lens-grid h3 {
  margin: 0.85rem 0 0.55rem;
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--ink);
}

.lens-grid p {
  flex-grow: 1;
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.7;
}

.md-typeset .lens-proof {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.2rem;
  padding-top: 0.9rem;
  color: var(--ink);
  text-decoration: none;
  border-top: 1px solid var(--line);
}

.lens-proof b {
  font-size: 0.74rem;
  font-weight: 600;
}

.lens-proof span {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.68rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lens-proof i {
  color: var(--accent);
  font-size: 0.85rem;
  font-style: normal;
  transition: transform 180ms ease;
}

.md-typeset .lens-proof:hover i {
  transform: translate(2px, -2px);
}

/* ============================================================
   FIELD NOTES — further reading index
   ============================================================ */
.notes {
  background: var(--paper);
  padding-top: 2.55rem;
  border-top: 1px solid var(--line);
}

.notes-list {
  border-top: 1px solid var(--line-strong);
}

.md-typeset .notes-list a {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) 2rem;
  align-items: center;
  gap: 1.4rem;
  padding: 1.1rem 0.4rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: padding 180ms ease, background-color 180ms ease;
}

.md-typeset .notes-list a:hover {
  padding-left: 1.1rem;
  padding-right: 1.1rem;
  background: var(--paper-2);
}

.notes-idx {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--faint);
}

.notes-body {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.notes-body strong {
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.notes-body em {
  font-style: normal;
  font-size: 0.76rem;
  color: var(--muted);
}

.notes-go {
  font-size: 1rem;
  color: var(--accent);
  text-align: center;
  transition: transform 180ms ease;
}

.md-typeset .notes-list a:hover .notes-go {
  transform: translateX(4px);
}

.md-typeset .notes-all {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.2rem;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  text-decoration: none;
}

.notes-all span {
  color: var(--accent);
  transition: transform 180ms ease;
}

.md-typeset .notes-all:hover span {
  transform: translateX(4px);
}

/* ============================================================
   Contact strip (homepage / project pages)
   ============================================================ */
.contact-strip {
  position: relative;
  left: 50%;
  box-sizing: border-box;
  width: 100vw;
  max-width: none;
  margin-left: -50vw;
  margin-bottom: -2rem;
  padding: 2.55rem var(--gutter);
  background: var(--paper-2);
  border-top: 1px solid var(--line-strong);
}

.contact-lede {
  max-width: 40ch;
  margin: 1rem 0 1.4rem;
  font-family: var(--display);
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 2rem;
}

.md-typeset .contact-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 0.15rem;
}

.md-typeset .contact-links a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

@media screen and (max-width: 76.234375em) {
  .contact-strip {
    padding-left: 1.6rem;
    padding-right: 1.6rem;
  }
}

/* ============================================================
   Project archive header (meta strip)
   ============================================================ */
.md-typeset .project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 2.2rem;
  margin: -0.4rem 0 1.6rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.md-typeset .project-meta span,
.md-typeset .project-meta a {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-family: var(--sans);
  font-size: 0.76rem;
  color: var(--ink-soft);
  text-decoration: none;
}

.md-typeset .project-meta b {
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
}

.md-typeset .project-meta a {
  color: var(--accent);
}

.md-typeset .project-meta a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============================================================
   Projects index — row list
   ============================================================ */
.md-typeset .proj-list {
  margin: 1.6rem 0;
  border-top: 1px solid var(--line-strong);
}

.md-typeset .proj-list a {
  display: block;
  padding: 1.15rem 0.3rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: padding 180ms ease, background-color 180ms ease;
}

.md-typeset .proj-list a:hover {
  padding-left: 0.9rem;
  padding-right: 0.9rem;
  background: var(--paper-2);
}

.md-typeset .proj-list a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.proj-name {
  display: block;
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.proj-q {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.proj-ev {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* Project lede: blockquote directly after the meta strip */
.md-typeset .project-meta + blockquote {
  margin: 0 0 1.8rem;
  padding: 0;
  border: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.md-typeset .project-meta + blockquote p {
  margin: 0;
}

/* ============================================================
   Architecture figures (inline SVG diagrams)
   ============================================================ */
.md-typeset .arch-figure {
  margin: 1.6rem 0;
  padding: 1.4rem 1.2rem 0.9rem;
  border: 1px solid var(--line);
  background: var(--card);
}

.md-typeset .arch-figure svg {
  display: block;
  width: 100%;
  height: auto;
}

.md-typeset .arch-figure figcaption {
  margin-top: 0.9rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--line);
  font-size: 0.7rem;
  color: var(--muted);
  text-align: left;
}

/* Note confidence badge */
.md-typeset .note-confidence {
  display: inline-block;
  margin-bottom: 0.4rem;
  padding: 0.18rem 0.55rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
}

/* ============================================================
   Footer
   ============================================================ */
.md-footer {
  background: var(--footer-bg);
}

.md-footer-meta {
  background: var(--footer-meta-bg);
}

.md-footer-meta .md-copyright,
.md-footer-meta .md-copyright__highlight {
  color: color-mix(in srgb, var(--footer-fg) 72%, transparent);
}

.md-footer-meta__inner {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
}

.md-footer-meta__inner .md-copyright {
  width: auto;
  margin: 0;
  text-align: center;
}

.md-footer-meta__inner .md-social {
  margin: 0;
}

.md-footer__inner {
  padding: 1rem 0;
}

/* ============================================================
   Responsive
   ============================================================ */
@media screen and (max-width: 76.234375em) {
  .masthead,
  .lens,
  .notes {
    padding-left: 1.6rem;
    padding-right: 1.6rem;
  }
}

@media screen and (max-width: 60em) {
  .masthead-foot {
    grid-template-columns: 1fr;
    gap: 1.6rem;
  }

  .masthead-actions {
    justify-self: start;
  }

  .lens-grid {
    grid-template-columns: 1fr;
    gap: 1.8rem;
  }
}

@media screen and (max-width: 44.984375em) {
  .md-content__inner {
    padding-top: 1.4rem;
  }

  .masthead-rule {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .md-typeset .masthead-name {
    font-size: 3rem;
  }

  .masthead-deck {
    font-size: 1.35rem;
  }

  .md-typeset .feature-head h2 {
    font-size: 1.9rem;
  }

  .md-typeset .notes-list a {
    grid-template-columns: 2rem minmax(0, 1fr) 1.5rem;
    gap: 0.8rem;
  }

  .contact-lede {
    font-size: 1.3rem;
  }
}

.md-typeset .lens-proof:focus-visible,
.md-typeset .notes-list a:focus-visible,
.md-typeset .notes-all:focus-visible,
.md-typeset .btn-primary:focus-visible,
.md-typeset .btn-ghost:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

  .lens-proof i,
  .notes-all span,
  .notes-go {
    transition: none;
  }
}