/* Self-hosted fonts (SIL Open Font License): Google Fonts is unreliable in mainland China. */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url("/assets/fonts/inter-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url("/assets/fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url("/assets/fonts/jetbrains-mono-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url("/assets/fonts/jetbrains-mono-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  color-scheme: light;
  --bg: #f0f0ef;
  --fg: #151515;
  --muted: #666666;
  --line: #dcdcda;
  --accent: #2f6f4f;
  --tag-bg: #e4e4e2;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: "JetBrains Mono", ui-monospace, Menlo, monospace; }

/* Print-only content (e.g. phone number on the résumé) */
.print-only { display: none; }

/* Bilingual: show only the active language */
html[data-lang="en"] .zh,
html[data-lang="zh"] .en { display: none; }

a { color: inherit; text-decoration-color: var(--line); text-underline-offset: 3px; }
a:hover { color: var(--accent); text-decoration-color: currentColor; }

.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- header ---------- */
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 0;
  font-size: 14px;
}
.logo { text-decoration: none; font-weight: 500; }
.top nav { display: flex; gap: 20px; align-items: center; }
.top nav a { text-decoration: none; color: var(--muted); }
.top nav a:hover { color: var(--fg); }
#lang-toggle {
  background: none;
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: 6px;
  padding: 3px 9px;
  font-size: 12px;
  line-height: 1.5;
  cursor: pointer;
}
#lang-toggle:hover { border-color: var(--fg); }
/* ---------- hero ---------- */
.hero { padding: 72px 0 56px; }
h1 {
  font-size: 40px;
  line-height: 1.1;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}
.role { color: var(--accent); font-size: 14px; margin: 0 0 28px; }
.lead { font-size: 18px; margin: 0 0 20px; }
.status { color: var(--muted); font-size: 14px; margin: 0 0 28px; display: flex; align-items: center; gap: 10px; }
.dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 20%, transparent);
  flex-shrink: 0;
}
.links { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 15px; }

/* ---------- sections ---------- */
section { padding: 40px 0; border-top: 1px solid var(--line); }
section.hero { border-top: none; }
h2 {
  font-size: 13px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 28px;
}
h3 { font-size: 17px; font-weight: 600; margin: 0; }

/* ---------- projects ---------- */
.project { margin-bottom: 36px; }
.project:last-child { margin-bottom: 0; }
.p-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 6px; }
.p-links { display: flex; gap: 14px; font-size: 13px; }
.p-links a { color: var(--muted); }
.project p { margin: 0 0 8px; }
.result { font-size: 15px; color: var(--accent); }
.tags { list-style: none; padding: 0; margin: 10px 0 0; display: flex; flex-wrap: wrap; gap: 6px; font-size: 12px; }
.tags li { background: var(--tag-bg); padding: 2px 8px; border-radius: 4px; color: var(--muted); }

/* ---------- experience ---------- */
.job { display: grid; grid-template-columns: 130px 1fr; gap: 16px; margin-bottom: 28px; }
.job:last-child { margin-bottom: 0; }
.j-meta { color: var(--muted); font-size: 13px; padding-top: 3px; }
.job ul { margin: 6px 0 0; padding-left: 18px; }
.job li { margin-bottom: 4px; }

/* ---------- skills ---------- */
.skills { display: grid; grid-template-columns: 130px 1fr; gap: 10px 16px; margin: 0; }
.skills dt { color: var(--muted); font-size: 13px; padding-top: 3px; }
.skills dd { margin: 0; }

/* ---------- writing ---------- */
.posts { list-style: none; padding: 0; margin: 0; }
.posts li { display: flex; justify-content: space-between; gap: 16px; padding: 8px 0; }
.posts span { color: var(--muted); font-size: 13px; white-space: nowrap; }

/* ---------- footer ---------- */
footer {
  display: flex;
  justify-content: space-between;
  padding: 32px 0 48px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}

/* ---------- mobile ---------- */
@media (max-width: 560px) {
  .top nav { gap: 14px; }
  .top nav a:not([download]) { display: none; }
  .hero { padding: 40px 0 40px; }
  h1 { font-size: 32px; }
  .lead { font-size: 17px; }
  .job, .skills { grid-template-columns: 1fr; gap: 4px; }
  .skills dd { margin-bottom: 10px; }
  .p-head { flex-direction: column; gap: 2px; }
}

/* ---------- main page additions ---------- */
.hero h1 { font-size: 36px; line-height: 1.2; margin: 0 0 20px; }
.hero .role { margin: 0 0 14px; }
.eyebrow { font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); margin: 0 0 10px; }
.product-name { font: 600 28px/1.2 Inter, "PingFang SC", system-ui, sans-serif; letter-spacing: -0.01em; text-transform: none; color: var(--fg); margin: 0 0 10px; }
.value { font-size: 18px; margin: 0 0 16px; }
.block { margin-top: 32px; }
.block > h3 { font-size: 12px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; }
.caps { margin: 0; padding-left: 18px; }
.caps li { margin-bottom: 6px; }
.arch {
  margin: 0; padding: 16px 18px; font-size: 13px; line-height: 1.6;
  background: var(--tag-bg); border: 1px solid var(--line); border-radius: 8px;
  overflow-x: auto; white-space: pre;
}
.caption { font-size: 14px; color: var(--muted); margin: 8px 0 0; }
.problem { padding: 14px 0 14px 16px; border-left: 2px solid var(--accent); margin-bottom: 14px; }
.problem h4 { font-size: 16px; font-weight: 600; margin: 0 0 6px; }
.problem p { margin: 0; font-size: 15px; }
#how-i-work p, #contact p { margin: 0 0 14px; }
.alt-name { font-size: 0.45em; font-weight: 500; color: var(--muted); letter-spacing: 0; margin-left: 6px; }
kbd {
  font: 12px "JetBrains Mono", ui-monospace, Menlo, monospace;
  border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 4px;
  padding: 0 5px; background: var(--tag-bg);
}
@media (max-width: 560px) {
  .hero h1 { font-size: 28px; }
  .product-name { font-size: 24px; }
  .value { font-size: 17px; }
  .arch { font-size: 11px; padding: 12px; }
}
.stack { display: grid; grid-template-columns: 110px 1fr; gap: 8px 16px; margin: 14px 0 0; }
.stack dt { color: var(--muted); font-size: 13px; padding-top: 4px; }
.stack dd { margin: 0; }
.stack .tags { margin: 0; }
@media (max-width: 560px) { .stack { grid-template-columns: 1fr; gap: 4px; } }