:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --text: #0a0a0b;
  --muted: #52565e;
  --faint: #70757e;
  --line: #e7e8ea;
  --line-strong: #cdcfd3;
  --chip: #f4f4f5;
  --sans: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "Roboto Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --r-card: 6px;
  --r-chip: 4px;
  --fs-body: 1rem;
  --fs-label: 0.75rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #09090a; --panel: #0f1012; --text: #f4f4f5; --muted: #a0a4ab;
    --faint: #868b94; --line: #1e1f23; --line-strong: #2c2e34; --chip: #141518;
  }
}
:root[data-theme="dark"] {
  --bg: #09090a; --panel: #0f1012; --text: #f4f4f5; --muted: #a0a4ab;
  --faint: #868b94; --line: #1e1f23; --line-strong: #2c2e34; --chip: #141518;
}
:root[data-theme="light"] {
  --bg: #ffffff; --panel: #ffffff; --text: #0a0a0b; --muted: #52565e;
  --faint: #70757e; --line: #e7e8ea; --line-strong: #cdcfd3; --chip: #f4f4f5;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: var(--sans);
  font-size: clamp(16px, 1.3vw, 17px);
  line-height: 1.6; letter-spacing: -0.006em;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}

strong, b { font-weight: inherit; }

main { max-width: 800px; margin: 0 auto; padding: 104px 32px 56px; counter-reset: sec; }

a:focus-visible, button:focus-visible, .social a:focus-visible,
.copy-btn:focus-visible, #theme-toggle:focus-visible, .work-link:focus-visible {
  outline: 2px solid var(--text); outline-offset: 3px; border-radius: 2px;
}

#theme-toggle {
  position: fixed; top: 22px; right: 22px; width: 42px; height: 42px;
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0; border: 1px solid var(--line-strong); border-radius: 50%;
  background: var(--bg); color: var(--muted); cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
#theme-toggle:hover { color: var(--text); border-color: var(--text); }
#theme-toggle svg { width: 17px; height: 17px; }
.icon-sun { display: none; } .icon-moon { display: block; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: block; }
  :root:not([data-theme="light"]) .icon-moon { display: none; }
}

.intro { margin-bottom: 44px; }
.logo { width: 160px; height: auto; display: block; margin: 0 0 24px -4px; }
:root[data-theme="dark"] .logo { filter: invert(1); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo { filter: invert(1); }
}
h1 {
  font-size: clamp(2.1rem, 5vw, 2.7rem); font-weight: 400;
  line-height: 1.15; letter-spacing: -0.02em; text-wrap: balance; margin: 0 0 16px;
}
.meta { margin: 0 0 22px; color: var(--muted); font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.01em; }
.meta span { color: var(--faint); margin: 0 6px; }
.social { display: flex; gap: 4px; align-items: center; margin-left: -11px; }
.social a { display: inline-flex; padding: 11px; color: var(--faint); transition: color 0.15s ease; }
.social a:hover { color: var(--text); }
.social svg { width: 19px; height: 19px; fill: currentColor; }

.lead { margin: 0 0 8px; }
.lead p {
  margin: 0; font-size: var(--fs-body);
  line-height: 1.6; color: var(--text); text-wrap: pretty;
}

.sec {
  counter-increment: sec; display: grid; grid-template-columns: 150px 1fr;
  gap: 32px; align-items: start; padding: 40px 0; border-top: 1px solid var(--line); margin: 0;
}
.sec:first-of-type { margin-top: 40px; }
.sec h2 {
  margin: 0; font-family: var(--mono); font-size: var(--fs-label); font-weight: 400;
  text-transform: uppercase; letter-spacing: 0.13em; color: var(--muted);
  position: sticky; top: 28px;
}
.sec h2::before {
  content: counter(sec, decimal-leading-zero); display: block; margin-bottom: 10px;
  color: var(--faint); font-size: var(--fs-label); letter-spacing: 0.08em;
}
.sec-body { min-width: 0; }
.sec-body > p { margin: 0; color: var(--muted); font-size: var(--fs-body); text-wrap: pretty; }
.sec-intro { margin: 0 0 18px !important; }

a { color: var(--text); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; text-decoration-color: var(--muted); transition: text-decoration-color 0.15s ease; }
a:hover { text-decoration-color: var(--text); }

.exp { display: flex; flex-direction: column; gap: 28px; }
.exp-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.exp-title { font-weight: 400; font-size: 1rem; color: var(--text); letter-spacing: -0.01em; }
.exp-date { font-family: var(--mono); font-size: var(--fs-label); color: var(--faint); font-variant-numeric: tabular-nums; }
.exp-org { display: block; font-family: var(--mono); font-size: var(--fs-label); color: var(--muted); margin: 4px 0 12px; }
.exp-item ul { margin: 0; padding: 0; list-style: none; }
.exp-item li { position: relative; margin-bottom: 9px; padding-left: 18px; color: var(--muted); font-size: var(--fs-body); line-height: 1.55; text-wrap: pretty; }
.exp-item li:last-child { margin-bottom: 0; }
.exp-item li::before { content: ""; position: absolute; left: 0; top: 0.66em; width: 6px; height: 1px; background: var(--faint); }

.work { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.work li { border-top: 1px solid var(--line); padding: 16px 0; }
.work li:first-child { border-top: none; padding-top: 0; }
.work-head { display: flex; align-items: center; gap: 10px; }
.work-name { font-weight: 400; font-size: 1rem; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.work-name:hover { text-decoration: underline; text-underline-offset: 3px; }
.work-desc { margin: 6px 0 0; color: var(--muted); font-size: var(--fs-body); line-height: 1.5; }
.tag { font-family: var(--mono); font-size: 0.68rem; font-weight: 400; text-transform: uppercase; letter-spacing: 0.08em; color: var(--faint); border: 1px solid var(--line-strong); border-radius: var(--r-chip); padding: 2px 6px; }

.skills { display: flex; flex-direction: column; gap: 10px; }
.skill-row { display: grid; grid-template-columns: 130px 1fr; gap: 18px; align-items: baseline; }
.skill-cat { font-family: var(--mono); font-size: var(--fs-label); font-weight: 400; color: var(--text); }
.skill-list { color: var(--muted); font-size: var(--fs-body); }

.writing { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.writing li { border-top: 1px solid var(--line); }
.writing li a { display: block; padding: 12px 0; color: var(--text); text-decoration: none; font-size: var(--fs-body); line-height: 1.4; }
.writing li a:hover { text-decoration: underline; text-underline-offset: 3px; }

footer { max-width: 800px; margin: 0 auto; padding: 24px 32px 40px; }
footer p { margin: 0; font-family: var(--mono); font-size: var(--fs-label); color: var(--faint); }
footer span { margin: 0 5px; }

.back { margin: 0 0 40px; font-family: var(--mono); font-size: var(--fs-label); }
.back a { color: var(--muted); text-decoration: none; }
.back a::before { content: "<- "; }
.back a:hover { color: var(--text); }
.doc-list { margin: 0; padding: 0; list-style: none; }
.doc-list li { position: relative; margin-bottom: 9px; padding-left: 18px; color: var(--muted); font-size: var(--fs-body); line-height: 1.55; }
.doc-list li::before { content: ""; position: absolute; left: 0; top: 0.66em; width: 6px; height: 1px; background: var(--faint); }
.doc-list strong { color: var(--text); font-weight: inherit; }

pre { position: relative; background: var(--chip); border: 1px solid var(--line); border-radius: var(--r-card); padding: 40px 16px 15px; overflow-x: auto; margin: 0 0 16px; }
pre::before {
  content: "bash"; position: absolute; top: 0; left: 0; right: 0; height: 33px;
  display: flex; align-items: center; padding-left: 14px;
  border-bottom: 1px solid var(--line); background: var(--bg);
  border-radius: var(--r-card) var(--r-card) 0 0;
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint);
}
.copy-btn {
  position: absolute; top: 6px; right: 8px; z-index: 1;
  font-family: var(--mono); font-size: 0.62rem; font-weight: 400; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); background: var(--panel); border: 1px solid var(--line-strong);
  border-radius: var(--r-chip); padding: 4px 9px; cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.copy-btn:hover { color: var(--text); border-color: var(--text); }
pre code { font-family: var(--mono); font-size: 0.82rem; line-height: 1.65; color: var(--text); background: none; padding: 0; }
code { font-family: var(--mono); font-size: 0.85em; background: var(--chip); border: 1px solid var(--line); border-radius: var(--r-chip); padding: 1px 5px; }

body.doc h1 { font-size: clamp(2rem, 5vw, 2.6rem); }
.doc .intro { margin-bottom: 36px; }
.doc section { margin: 34px 0; }
.doc h2 { font-family: var(--mono); font-size: var(--fs-label); font-weight: 400; text-transform: uppercase; letter-spacing: 0.13em; color: var(--muted); margin: 0 0 16px; }

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}

@media (max-width: 640px) {
  main { padding: 72px 20px 40px; }
  .sec { grid-template-columns: 1fr; gap: 14px; padding: 30px 0; }
  .sec h2 { position: static; }
  .sec h2::before { display: inline; margin: 0 8px 0 0; }
  .skill-row { grid-template-columns: 1fr; gap: 2px; }
  footer { padding: 24px 20px 36px; }
}