/* ==========================================================================
   Fonts — self-hosted (no external font services)
   Spectral & IBM Plex are both SIL Open Font License. See assets/fonts/OFL-*.txt
   ========================================================================== */
@font-face {
  font-family: "Spectral";
  src: url("assets/fonts/Spectral-Medium.ttf") format("truetype");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Spectral";
  src: url("assets/fonts/Spectral-SemiBold.ttf") format("truetype");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("assets/fonts/IBMPlexSans-Variable.ttf") format("truetype-variations");
  font-weight: 100 700;
  font-stretch: 75% 125%;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("assets/fonts/IBMPlexMono-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("assets/fonts/IBMPlexMono-Medium.ttf") format("truetype");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* ==========================================================================
   Design tokens
   ========================================================================== */
:root {
  --bg:          #0a0d12;
  --bg-panel:    #11151d;
  --bg-panel-2:  #161b25;
  --line:        #232a38;
  --text:        #e7e9ee;
  --text-dim:    #8993a6;
  --text-faint:  #5b6478;
  --accent:      #c9a463;
  --accent-dim:  #8a744a;

  --serif: "Spectral", "Iowan Old Style", "Georgia", serif;
  --sans:  "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:  "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --content-width: 720px;
  --pad: clamp(20px, 5vw, 48px);
}

* { box-sizing: border-box; }

html {
  background: var(--bg);
  color-scheme: dark;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--text);
  text-decoration-color: var(--text-faint);
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}
a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

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

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.4em 0;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em 0; }

.mono {
  font-family: var(--mono);
}

/* ==========================================================================
   Nav
   ========================================================================== */
.site-nav {
  border-bottom: 1px solid var(--line);
  background: rgba(10, 13, 18, 0.85);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-nav__inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 18px var(--pad);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 24px;
}
.site-nav__inner--with-mark {
  justify-content: space-between;
}

.site-nav__mark {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}
.site-nav__mark:hover { color: var(--accent); }
.site-nav__mark .dim { color: var(--text-faint); }

.site-nav__links {
  display: flex;
  gap: clamp(14px, 3vw, 28px);
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-nav__links a {
  text-decoration: none;
  color: var(--text-dim);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.site-nav__links a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent-dim);
}
.site-nav__links a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ==========================================================================
   Layout shell
   ========================================================================== */
main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: clamp(48px, 8vw, 96px) var(--pad) 120px;
}

.page-head {
  margin-bottom: 48px;
}

.eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.lede {
  color: var(--text-dim);
  font-size: 1.05em;
  max-width: 56ch;
}

hr.rule {
  border: none;
  border-top: 1px solid var(--line);
  margin: 40px 0;
}

/* ==========================================================================
   Home / hero
   ========================================================================== */
.hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(28px, 6vw, 56px);
  align-items: center;
  margin-bottom: 12px;
}

.hero__portrait {
  width: 132px;
  height: 132px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  overflow: hidden;
  flex-shrink: 0;
}
.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero__name {
  font-size: clamp(2rem, 5vw, 2.6rem);
}

.hero__title {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}
.hero__title .accent { color: var(--accent); }

.field-notes {
  margin-top: 56px;
}

.field-notes__label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 14px;
}

.icon-row {
  display: flex;
  gap: 12px;
}

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--line);
  color: var(--text-dim);
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.icon-link:hover {
  color: var(--accent);
  border-color: var(--accent-dim);
  background: var(--bg-panel);
}

.icon-cutout {
  fill: var(--bg);
  transition: fill 0.15s ease;
}
.icon-link:hover .icon-cutout {
  fill: var(--bg-panel);
}

/* ==========================================================================
   CV page
   ========================================================================== */
.cv-download {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  color: var(--text);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.03em;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.cv-download:hover {
  border-color: var(--accent);
  background: var(--bg-panel-2);
  color: var(--accent);
}
.cv-download svg { flex-shrink: 0; }

.cv-download__size {
  color: var(--text-faint);
  font-size: 12px;
}

.cv-meta {
  margin-top: 20px;
  color: var(--text-faint);
  font-size: 14px;
}

/* ==========================================================================
   Resources
   ========================================================================== */
.resource-card {
  display: block;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
}
.resource-card:last-of-type {
  border-bottom: 1px solid var(--line);
}

.resource-card__title {
  font-size: 1.3rem;
  margin-bottom: 8px;
  color: var(--text);
}
.resource-card:hover .resource-card__title {
  color: var(--accent);
}

.resource-card__desc {
  color: var(--text-dim);
  margin-bottom: 0;
}

.resource-card--disabled .resource-card__title,
.resource-card--disabled:hover .resource-card__title {
  color: var(--text-faint);
}
.resource-card--disabled .resource-card__desc {
  color: var(--text-faint);
}

.breadcrumb {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 14px;
}
.breadcrumb a {
  color: var(--text-faint);
  text-decoration: none;
  border-bottom: 1px solid var(--text-faint);
}
.breadcrumb a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ==========================================================================
   Projects
   ========================================================================== */
.project {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.project:last-child { border-bottom: 1px solid var(--line); }

.project__id {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 10px;
}

.project__title {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.project__desc {
  color: var(--text-dim);
  margin-bottom: 14px;
}

.project__image {
  display: block;
  width: 100%;
  max-width: 480px;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  margin: 4px 0 16px;
}

.project__image--large {
  max-width: 640px;
}

.code-block-wrap {
  position: relative;
  max-width: 640px;
  margin: 4px 0 16px;
}

.code-block {
  display: block;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  margin: 0;
  padding: 16px 18px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
}

.code-block .comment {
  color: var(--text-faint);
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  background: var(--bg-panel-2);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent-dim);
}
.copy-btn[data-copied="true"] {
  color: var(--accent);
  border-color: var(--accent-dim);
}

.equation-block {
  display: block;
  overflow-x: auto;
  max-width: 640px;
  border: 1px solid var(--line);
  background: var(--bg-panel);
  margin: 4px 0 16px;
  padding: 22px 26px;
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 2.1;
  color: var(--text);
  text-align: center;
}
.equation-block sub,
.equation-block sup {
  font-size: 0.68em;
}

.calibration {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}
.calibration:last-of-type {
  border-bottom: 1px solid var(--line);
}

.calibration__title {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.calibration__tag {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.calibration__desc {
  color: var(--text-dim);
  margin-bottom: 14px;
}

.project__links {
  display: flex;
  gap: 20px;
  font-family: var(--mono);
  font-size: 13px;
}
.project__links a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid var(--text-faint);
}
.project__links a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.contact-list li {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.contact-list li:last-child { border-bottom: 1px solid var(--line); }

.contact-list .label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  width: 90px;
  flex-shrink: 0;
}

.stacked-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contact-list a {
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.6;
  text-decoration: none;
  color: var(--text);
  border-bottom: 1px solid var(--text-faint);
}
.contact-list a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  max-width: 920px;
  margin: 0 auto;
  padding: 24px var(--pad) 48px;
  color: var(--text-faint);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 560px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .contact-list li {
    flex-direction: column;
    gap: 4px;
  }
  .contact-list .label { width: auto; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}