/*
Design language
- Purpose: a personal technical index to scan, not a marketing pitch.
- Owner: this stylesheet; no component library.
- Locale: zh-CN; CJK line height and wrapping are the longest-layout constraint.
- Theme: light and dark follow the system before first paint.
- Audience: technical peers and curious readers.
- Deliberately not doing: hero slogans, avatars, cards, pills, gradients, section numbers,
  invented metrics, decorative motion, or repeated button CTAs.
*/
:root {
  color-scheme: light dark;
  --page: #ecebe6;
  --ink: #111512;
  --body: #424843;
  --muted: #737873;
  --line: #bfc1bb;
  --accent: #c93022;
  --hover: #e2e1dc;
  --focus: #1248a3;
  --content: 80rem;
  --page-pad: clamp(1rem, 4vw, 3.5rem);
  --radius-focus: 0.125rem;
  --speed: 140ms;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #131614;
    --ink: #eeeee9;
    --body: #bdc2bd;
    --muted: #858c86;
    --line: #3c423d;
    --accent: #ff695b;
    --hover: #1d221e;
    --focus: #8bb4ff;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:focus-visible {
  outline: 0.15rem solid var(--focus);
  outline-offset: 0.22rem;
  border-radius: var(--radius-focus);
}
p, h1, h2, h3, span { overflow-wrap: anywhere; }
.skip-link {
  position: fixed;
  inset-block-start: 0.75rem;
  inset-inline-start: 0.75rem;
  z-index: 10;
  padding: 0.55rem 0.7rem;
  background: var(--ink);
  color: var(--page);
  transform: translateY(-150%);
}
.skip-link:focus { transform: none; }

.topbar,
main,
footer {
  width: min(calc(100% - 2 * var(--page-pad)), var(--content));
  margin-inline: auto;
}
.topbar {
  min-height: 4.5rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 2rem;
  border-block-end: 1px solid var(--ink);
  font-size: 0.82rem;
}
.nameplate {
  font-weight: 760;
  letter-spacing: -0.015em;
}
.topbar nav { display: flex; gap: clamp(1rem, 3vw, 2rem); color: var(--body); }
.external { justify-self: end; }
.topbar a,
.plain-links a,
.block-heading a,
footer a { text-decoration: underline; text-decoration-thickness: 0.06rem; text-underline-offset: 0.22rem; }
.topbar a:hover,
.plain-links a:hover,
.block-heading a:hover,
footer a:hover { color: var(--accent); }

.intro {
  display: grid;
  grid-template-columns: minmax(18rem, 0.78fr) minmax(0, 1.22fr);
  gap: clamp(3rem, 8vw, 9rem);
  padding-block: clamp(5rem, 11vw, 9rem);
  border-block-end: 1px solid var(--ink);
}
.role {
  margin: 0 0 1rem;
  color: var(--accent);
  font: 650 0.72rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.05em;
}
h1 {
  margin: 0;
  font-size: clamp(3.5rem, 8vw, 7.8rem);
  font-weight: 740;
  line-height: 0.78;
  letter-spacing: -0.085em;
}
.intro-copy {
  align-self: end;
  max-width: 39rem;
  padding-block-end: 0.25rem;
}
.intro-copy p { margin: 0; color: var(--body); font-size: clamp(1rem, 1.35vw, 1.16rem); }
.intro-copy .lead {
  margin-block-end: 1.4rem;
  color: var(--ink);
  font-size: clamp(1.45rem, 2.4vw, 2.2rem);
  font-weight: 620;
  line-height: 1.35;
  letter-spacing: -0.025em;
}
.plain-links { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; margin-block-start: 2rem; font-size: 0.9rem; }

.layout {
  display: grid;
  grid-template-columns: minmax(15rem, 0.36fr) minmax(0, 1fr);
  gap: clamp(3rem, 8vw, 8rem);
}
.profile {
  padding-block: clamp(4rem, 8vw, 7rem);
  border-inline-end: 1px solid var(--line);
  padding-inline-end: clamp(2rem, 5vw, 5rem);
}
.sticky { position: sticky; inset-block-start: 2rem; }
.label {
  margin: 0 0 2rem;
  color: var(--accent);
  font: 650 0.72rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
}
.profile p:not(.label) { margin: 0; color: var(--body); }
.profile p + p { margin-block-start: 1rem; }
.profile dl { margin: 2.5rem 0 0; }
.profile dl div {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1rem;
  padding-block: 0.7rem;
  border-block-start: 1px solid var(--line);
  font-size: 0.78rem;
}
.profile dl div:last-child { border-block-end: 1px solid var(--line); }
.profile dt { color: var(--muted); }
.profile dd { margin: 0; }

.content { min-width: 0; }
.block { padding-block: clamp(4rem, 8vw, 7rem); border-block-end: 1px solid var(--ink); }
.block-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  margin-block-end: 2.5rem;
}
h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  font-weight: 680;
  line-height: 1.15;
  letter-spacing: -0.04em;
}
.block-heading a { color: var(--body); font-size: 0.82rem; white-space: nowrap; }

.project-list { border-block-start: 1px solid var(--line); }
.project {
  display: grid;
  grid-template-columns: minmax(10rem, 0.36fr) minmax(0, 1fr) 8rem 1rem;
  align-items: baseline;
  gap: 1.5rem;
  padding-block: 1.4rem;
  border-block-end: 1px solid var(--line);
  transition: color var(--speed) ease-out, background-color var(--speed) ease-out;
}
.project-name { font-weight: 700; letter-spacing: -0.02em; }
.project-description { color: var(--body); font-size: 0.9rem; }
.project-kind { color: var(--muted); font: 0.68rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; text-align: end; }
.project-arrow { color: var(--accent); text-align: end; }
@media (hover: hover) {
  .project:hover { background: var(--hover); color: var(--accent); }
  .project:hover .project-description,
  .project:hover .project-kind { color: var(--ink); }
}

.note-group { display: grid; grid-template-columns: minmax(10rem, 0.36fr) minmax(0, 1fr); gap: 1.5rem; border-block-start: 1px solid var(--line); }
.note-group h3 {
  margin: 0;
  padding-block: 1.25rem;
  font-size: 0.92rem;
  font-weight: 680;
}
.note-group ul { margin: 0; padding: 0; list-style: none; }
.note-group li { border-block-end: 1px solid var(--line); }
.note-group a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 7rem 1rem;
  gap: 1rem;
  padding-block: 1.2rem;
  font-size: 0.9rem;
}
.note-meta { color: var(--muted); font-size: 0.76rem; }
.note-arrow { color: var(--accent); text-align: end; }
.note-group a:hover .note-title { color: var(--accent); }

.closing { padding-block: clamp(4rem, 8vw, 7rem); }
.closing p { max-width: 35rem; margin: 1rem 0 0; color: var(--body); }

footer {
  min-height: 5rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1.5rem;
  border-block-start: 1px solid var(--ink);
  color: var(--muted);
  font: 0.68rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
}
footer a { justify-self: end; }

@media (max-width: 52rem) {
  .intro { grid-template-columns: 1fr; gap: 3.5rem; }
  h1 { line-height: 0.84; }
  .layout { grid-template-columns: 1fr; gap: 0; }
  .profile { border-inline-end: 0; border-block-end: 1px solid var(--ink); padding-inline-end: 0; }
  .sticky { position: static; }
  .profile dl { max-width: 34rem; }
}
@media (max-width: 38rem) {
  :root { --page-pad: 0.75rem; }
  .topbar { grid-template-columns: 1fr auto; gap: 1rem; }
  .topbar nav { display: none; }
  h1 { font-size: clamp(3.4rem, 22vw, 5.7rem); }
  .project { grid-template-columns: minmax(0, 1fr) 1rem; gap: 0.6rem 1rem; }
  .project-description, .project-kind { grid-column: 1; }
  .project-kind { text-align: start; }
  .project-arrow { grid-column: 2; grid-row: 1 / span 3; }
  .note-group { grid-template-columns: 1fr; gap: 0; }
  .note-group h3 { padding-block-end: 0.5rem; }
  .note-group a { grid-template-columns: minmax(0, 1fr) 1rem; }
  .note-meta { grid-column: 1; }
  .note-arrow { grid-column: 2; grid-row: 1 / span 2; }
  footer { grid-template-columns: 1fr auto; }
  footer span[data-secondary] { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .project { transition: none; }
}
@media (forced-colors: active) {
  .project:hover { outline: 1px solid CanvasText; }
}