:root {
  --bg:   #FAFAF9;
  --sur:  #FFFFFF;
  --txt:  #14181C;
  --txt2: #5A666F;
  --bdr:  #E0E4E7;
  --acc:  #1D5C73;
  --acc2: #E8F1F4;

  --type: 'Courier Prime', 'Courier New', monospace;
  --body: 'Inter', -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', 'SF Mono', monospace;
  --dm:   'DM Mono', monospace;
}

@media (prefers-color-scheme: dark) { :root {
  --bg:   #0F1215;
  --sur:  #181C1F;
  --txt:  #E4E8EB;
  --txt2: #8A949C;
  --bdr:  #23282C;
  --acc:  #4FA8C4;
  --acc2: #162229;
}}
:root[data-theme="light"] { --bg:#FAFAF9;--sur:#FFFFFF;--txt:#14181C;--txt2:#5A666F;--bdr:#E0E4E7;--acc:#1D5C73;--acc2:#E8F1F4; }
:root[data-theme="dark"]  { --bg:#0F1215;--sur:#181C1F;--txt:#E4E8EB;--txt2:#8A949C;--bdr:#23282C;--acc:#4FA8C4;--acc2:#162229; }

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--txt);
  font-family: var(--body);
  font-size: 18.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 28px;
}

a { color: var(--acc); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--acc); outline-offset: 2px; }

/* ── Theme toggle ─────────────────────── */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 0 2px 6px;
  color: var(--txt2);
  display: flex;
  align-items: center;
  line-height: 1;
}
.theme-toggle:hover { color: var(--txt); }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ── Header ───────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--bdr);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(6px);
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 17px;
  padding-bottom: 17px;
}
.wordmark {
  font-family: var(--type);
  font-weight: 700;
  font-size: 17.5px;
  letter-spacing: 0.01em;
  color: var(--txt);
}
.wordmark:hover { text-decoration: none; opacity: 0.7; }

nav { display: flex; gap: 24px; }
nav a {
  font-family: var(--body);
  font-size: 15.5px;
  font-weight: 500;
  color: var(--txt2);
}
nav a:hover { color: var(--txt); text-decoration: none; }

/* ── Hero ─────────────────────────────── */
.hero {
  padding-top: 32px;
  padding-bottom: 28px;
}
.coord {
  display: block;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--acc);
  letter-spacing: 0.06em;
  margin-bottom: 18px;
}
.hero h1 {
  font-family: var(--type);
  font-size: 44px;
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: 0.01em;
  margin-bottom: 18px;
  text-wrap: balance;
}
.hero-sub {
  font-size: 15px;
  line-height: 1.72;
  color: var(--txt2);
}

/* ── Shared section ───────────────────── */
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--txt2);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  margin-bottom: 18px;
}

/* ── Work ─────────────────────────────── */
.work {
  padding-top: 20px;
  border-top: 1px solid var(--bdr);
  padding-bottom: 20px;
}
.project-list {
  list-style: none;
  margin-bottom: 22px;
}
.project-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--bdr);
}
.project-list li:first-child { border-top: 1px solid var(--bdr); }

.proj-title {
  font-family: var(--dm);
  font-size: 15px;
  font-weight: 700;
  color: var(--txt);
  letter-spacing: 0.01em;
}
.proj-title:hover { color: var(--acc); text-decoration: none; }

.proj-tag {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--txt2);
  white-space: nowrap;
  flex-shrink: 0;
}
.all-projects {
  font-size: 15px;
  font-weight: 500;
  color: var(--txt2);
}
.all-projects:hover { color: var(--acc); text-decoration: none; }

/* ── Certs ────────────────────────────── */
.certs {
  padding-top: 20px;
  border-top: 1px solid var(--bdr);
  padding-bottom: 20px;
}
.cert-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.cert-list li {
  font-family: var(--dm);
  font-size: 15px;
  color: var(--txt);
  padding: 11px 0;
  border-bottom: 1px solid var(--bdr);
}
.cert-list li:first-child { border-top: 1px solid var(--bdr); }
.cert-list li span {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--txt2);
}

/* ── contact ──────────────────────────── */
.contact {
  padding-top: 20px;
  border-top: 1px solid var(--bdr);
  padding-bottom: 36px;
}
.contact-row {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.contact-email {
  font-family: var(--mono);
  font-size: 16px;
  color: var(--txt);
}
.contact-email:hover { color: var(--acc); text-decoration: none; }
.contact-row a:not(.contact-email) {
  font-size: 15.5px;
  color: var(--txt2);
}
.contact-row a:not(.contact-email):hover { color: var(--acc); text-decoration: none; }

/* ── Footer ───────────────────────────── */
.site-footer {
  border-top: 1px solid var(--bdr);
  padding: 22px 28px;
}
.site-footer p {
  font-family: var(--type);
  font-size: 14.5px;
  color: var(--txt2);
  max-width: 700px;
  margin: 0 auto;
}

/* ── projects page ────────────────────── */
.page-intro {
  padding-top: 56px;
  padding-bottom: 8px;
}

.proj-article {
  padding: 44px 0;
  border-top: 1px solid var(--bdr);
}

.proj-article:last-child {
  padding-bottom: 80px;
}

.proj-article .coord {
  display: block;
  margin-bottom: 12px;
}

.proj-article h2 {
  font-family: var(--type);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
  text-wrap: balance;
  margin-bottom: 16px;
}

.proj-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--txt2);
  max-width: 580px;
  margin-bottom: 20px;
}

.proj-meta {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--txt);
  margin-bottom: 20px;
}
.proj-meta .ml {
  color: var(--txt2);
}

.proj-link {
  font-family: var(--body);
  font-size: 13px;
  font-weight: 500;
  color: var(--txt2);
}

.proj-link:hover {
  color: var(--acc);
  text-decoration: none;
}

/* ── Responsive ───────────────────────── */
@media (max-width: 600px) {
  .hero { padding-top: 52px; padding-bottom: 48px; }
  .hero h1 { font-size: 34.5px; }
  nav { gap: 16px; }
}

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