/* =========================================================
   v1-minimal — 排版驱动的极简个人站
   Typography · Grid · Restraint
   ========================================================= */

:root{
  /* -------- Colors -------- */
  --bg:        #FAFAF9;
  --bg-soft:   #F4F3F0;
  --ink:       #111110;
  --ink-2:     #2A2A28;
  --muted:     #8A8A85;
  --muted-2:   #B8B6B0;
  --rule:      #E4E2DD;
  --rule-soft: #EDEBE6;
  /* low-saturation cool-blue accent (oklch) */
  --accent:    oklch(0.55 0.06 245);
  --accent-2:  oklch(0.55 0.06 245 / 0.10);

  /* -------- Type -------- */
  --f-sans: "IBM Plex Sans", "Noto Sans SC", system-ui, -apple-system, "PingFang SC", sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --f-cn:   "Noto Sans SC", "IBM Plex Sans", system-ui, "PingFang SC", sans-serif;

  /* -------- Rhythm -------- */
  --rail-w:   220px;
  --main-max: 760px;
  --pad-x:    48px;
  --pad-y:    72px;
}

*,*::before,*::after{ box-sizing:border-box; }
html,body{ margin:0; padding:0; }
html{ -webkit-text-size-adjust:100%; }

body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--f-cn);
  font-size:14px;
  line-height:1.7;
  font-weight:400;
  letter-spacing:0.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  font-feature-settings:"tnum" 1, "ss01" 1;
  text-rendering:optimizeLegibility;
}

::selection{ background:var(--accent-2); color:var(--ink); }

a{ color:inherit; text-decoration:none; }

/* =========================================================
   Layout — left rail + main
   ========================================================= */

.rail{
  position:fixed;
  top:0; left:0;
  width:var(--rail-w);
  height:100vh;
  padding:var(--pad-y) 28px var(--pad-y) var(--pad-x);
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  border-right:1px solid var(--rule);
  background:var(--bg);
  z-index:10;
}

.main{
  margin-left:var(--rail-w);
  padding:var(--pad-y) var(--pad-x) 96px 64px;
  max-width:calc(var(--main-max) + 64px + var(--pad-x));
}

/* =========================================================
   Rail content
   ========================================================= */

.rail-top{ display:flex; flex-direction:column; gap:22px; }

.mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:28px; height:28px;
  border:1px solid var(--ink);
  font-family:var(--f-mono);
  font-size:10px;
  font-weight:500;
  letter-spacing:0.06em;
  color:var(--ink);
}

.rail-name-cn{
  font-size:17px;
  font-weight:500;
  letter-spacing:0.08em;
  color:var(--ink);
}
.rail-name-en{
  font-family:var(--f-sans);
  font-size:11px;
  font-weight:400;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--muted);
  margin-top:4px;
}

.rail-nav{
  display:flex;
  flex-direction:column;
  gap:2px;
  margin-top:48px;
}
.rail-nav a{
  display:grid;
  grid-template-columns:30px 1fr;
  align-items:baseline;
  padding:7px 0;
  font-size:12.5px;
  color:var(--ink-2);
  border-bottom:1px solid transparent;
  transition:color .2s, border-color .2s;
}
.rail-nav a:hover{ color:var(--accent); }
.rail-nav .nav-num{
  font-family:var(--f-mono);
  font-size:10.5px;
  color:var(--muted-2);
  letter-spacing:0.04em;
}
.rail-nav .nav-label{ letter-spacing:0.04em; }

.rail-foot{ display:flex; flex-direction:column; gap:8px; }
.status{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--ink-2);
  letter-spacing:0.02em;
}
.status-dot{
  width:6px; height:6px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 3px var(--accent-2);
  animation:pulse 2.8s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{ opacity:1; }
  50%    { opacity:0.55; }
}
.rail-loc{
  font-family:var(--f-mono);
  font-size:10.5px;
  color:var(--muted);
  letter-spacing:0.04em;
}

/* =========================================================
   Hero
   ========================================================= */

.hero{
  padding-bottom:104px;
  border-bottom:1px solid var(--rule);
}

.hero-meta{
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--muted);
  letter-spacing:0.08em;
  text-transform:uppercase;
  margin-bottom:56px;
}
.hero-meta .sep{ margin:0 10px; color:var(--muted-2); }

.hero-title{
  font-family:var(--f-cn);
  font-size:40px;
  font-weight:500;
  line-height:1.35;
  letter-spacing:-0.005em;
  color:var(--ink);
  margin:0 0 36px;
  max-width:640px;
  text-wrap:pretty;
}
.hero-title em{
  font-style:normal;
  font-weight:500;
  color:var(--accent);
  border-bottom:1px solid var(--accent);
  padding-bottom:1px;
}

.hero-lede{
  font-size:15.5px;
  line-height:1.85;
  color:var(--ink-2);
  max-width:620px;
  margin:0 0 48px;
  text-wrap:pretty;
}

/* facts */
.hero-facts{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:0;
  margin:0 0 44px;
  padding:20px 0;
  border-top:1px solid var(--rule);
  border-bottom:1px solid var(--rule);
}
.hero-facts > div{
  padding-right:16px;
}
.hero-facts dt{
  font-family:var(--f-mono);
  font-size:10px;
  color:var(--muted);
  letter-spacing:0.1em;
  text-transform:uppercase;
  margin-bottom:6px;
}
.hero-facts dd{
  margin:0;
  font-size:13.5px;
  color:var(--ink);
  letter-spacing:0.01em;
}

/* actions */
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:28px;
  font-size:13.5px;
}
.link{
  color:var(--ink);
  border-bottom:1px solid var(--ink);
  padding-bottom:2px;
  transition:color .18s, border-color .18s, letter-spacing .18s;
  letter-spacing:0.01em;
}
.link:hover{
  color:var(--accent);
  border-color:var(--accent);
}

/* =========================================================
   Generic section
   ========================================================= */

.section{
  padding:88px 0 16px;
  border-bottom:1px solid var(--rule);
}
.section:last-of-type{ border-bottom:none; }

.section-head{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:baseline;
  gap:18px;
  margin-bottom:52px;
}
.section-num{
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--muted);
  letter-spacing:0.08em;
}
.section-title{
  font-size:18px;
  font-weight:500;
  letter-spacing:0.08em;
  color:var(--ink);
  margin:0;
}
.section-note{
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--muted);
  letter-spacing:0.02em;
  justify-self:end;
  text-align:right;
}

/* =========================================================
   Project
   ========================================================= */

.project{
  padding:40px 0 48px;
  border-top:1px dashed var(--rule);
}
.project:first-of-type{ border-top:none; padding-top:0; }

.project-head{
  display:grid;
  grid-template-columns:56px 1fr;
  gap:20px;
  align-items:baseline;
  margin-bottom:20px;
}
.project-index{
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--muted);
  letter-spacing:0.06em;
  padding-top:6px;
}
.project-title{
  font-size:22px;
  font-weight:500;
  letter-spacing:0.005em;
  color:var(--ink);
  margin:0 0 6px;
  line-height:1.4;
}
.project-sub{
  font-size:12.5px;
  color:var(--muted);
  letter-spacing:0.02em;
}
.project-sub .sep{ margin:0 8px; color:var(--muted-2); }

.project-desc{
  font-size:14.5px;
  line-height:1.85;
  color:var(--ink-2);
  margin:0 0 24px 76px;
  max-width:580px;
  text-wrap:pretty;
}

.project-highlights{
  list-style:none;
  padding:0;
  margin:0 0 28px 76px;
  display:flex;
  flex-direction:column;
  gap:10px;
  max-width:620px;
}
.project-highlights li{
  display:grid;
  grid-template-columns:32px 1fr;
  gap:0;
  font-size:13.5px;
  line-height:1.75;
  color:var(--ink-2);
  padding:2px 0;
}
.project-highlights .hi-num{
  font-family:var(--f-mono);
  font-size:10.5px;
  color:var(--muted-2);
  letter-spacing:0.04em;
  padding-top:3px;
}

.stack{
  display:flex;
  flex-wrap:wrap;
  gap:0 18px;
  margin-left:76px;
  font-family:var(--f-mono);
  font-size:11.5px;
  color:var(--muted);
  letter-spacing:0.02em;
}
.stack span{
  position:relative;
}
.stack span + span::before{
  content:"·";
  position:absolute;
  left:-11px;
  color:var(--muted-2);
}

/* =========================================================
   Career timeline
   ========================================================= */

.career{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  flex-direction:column;
}
.career li{
  display:grid;
  grid-template-columns:180px 1fr auto;
  gap:24px;
  align-items:baseline;
  padding:18px 0;
  border-top:1px solid var(--rule-soft);
}
.career li:first-child{ border-top:none; }
.career-year{
  font-family:var(--f-mono);
  font-size:12px;
  color:var(--muted);
  letter-spacing:0.02em;
}
.career-body{ display:flex; flex-direction:column; gap:4px; }
.career-role{
  font-size:14.5px;
  color:var(--ink);
  letter-spacing:0.01em;
}
.career-co{
  font-size:12.5px;
  color:var(--muted);
  letter-spacing:0.02em;
}
.career-span{
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--muted-2);
  letter-spacing:0.04em;
}

/* =========================================================
   Skills
   ========================================================= */

.skills{
  margin:0;
  display:flex;
  flex-direction:column;
  gap:0;
}
.skill-group{
  display:grid;
  grid-template-columns:140px 1fr;
  gap:24px;
  padding:18px 0;
  border-top:1px solid var(--rule-soft);
  align-items:baseline;
}
.skill-group:first-child{ border-top:none; }
.skills dt{
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--muted);
  letter-spacing:0.06em;
  text-transform:uppercase;
}
.skills dd{
  margin:0;
  font-size:14px;
  color:var(--ink-2);
  letter-spacing:0.01em;
  line-height:1.7;
}

/* =========================================================
   Contact
   ========================================================= */

.section-contact{ padding-bottom:48px; }

.contact{
  display:flex;
  flex-direction:column;
}
.contact-row{
  display:grid;
  grid-template-columns:100px 1fr auto;
  gap:20px;
  align-items:baseline;
  padding:20px 0;
  border-top:1px solid var(--rule-soft);
  transition:padding-left .25s ease;
}
.contact-row:first-child{ border-top:1px solid var(--rule); }
.contact-row:last-child{ border-bottom:1px solid var(--rule); }
.contact-row:hover{
  padding-left:8px;
}
.contact-row:hover .contact-v{ color:var(--accent); }
.contact-row:hover .contact-arr{ color:var(--accent); transform:translate(2px,-2px); }

.contact-k{
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--muted);
  letter-spacing:0.08em;
  text-transform:uppercase;
}
.contact-v{
  font-family:var(--f-mono);
  font-size:14px;
  color:var(--ink);
  letter-spacing:0.01em;
  transition:color .2s;
}
.contact-arr{
  font-family:var(--f-mono);
  font-size:13px;
  color:var(--muted);
  transition:color .2s, transform .25s;
}

.foot{
  margin-top:64px;
  font-family:var(--f-mono);
  font-size:11px;
  color:var(--muted);
  letter-spacing:0.04em;
  display:flex;
  flex-wrap:wrap;
  gap:0 10px;
}
.foot .sep{ color:var(--muted-2); }
.foot a{ color:var(--muted); border-bottom:1px solid var(--rule); padding-bottom:1px; }
.foot a:hover{ color:var(--accent); border-color:var(--accent); }

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 960px){
  :root{
    --pad-x: 28px;
    --pad-y: 40px;
  }

  .rail{
    position:static;
    width:auto;
    height:auto;
    padding:28px var(--pad-x) 28px;
    border-right:none;
    border-bottom:1px solid var(--rule);
    flex-direction:row;
    justify-content:space-between;
    align-items:center;
    gap:20px;
  }
  .rail-top{
    flex-direction:row;
    align-items:center;
    gap:14px;
  }
  .rail-nav{
    display:none;
  }
  .rail-foot{
    align-items:flex-end;
    gap:4px;
  }
  .rail-loc{ text-align:right; }

  .main{
    margin-left:0;
    padding:40px var(--pad-x) 80px;
  }

  .hero{ padding-bottom:72px; }
  .hero-meta{ margin-bottom:36px; }
  .hero-title{
    font-size:28px;
    line-height:1.4;
    margin-bottom:24px;
  }
  .hero-lede{
    font-size:14.5px;
    line-height:1.8;
    margin-bottom:32px;
  }
  .hero-facts{
    grid-template-columns:repeat(2, 1fr);
    row-gap:20px;
  }
  .hero-actions{
    flex-direction:column;
    gap:14px;
    align-items:flex-start;
  }

  .section{ padding:60px 0 16px; }
  .section-head{
    grid-template-columns:auto 1fr;
    row-gap:4px;
    margin-bottom:32px;
  }
  .section-note{
    grid-column:1 / -1;
    justify-self:start;
    text-align:left;
    color:var(--muted-2);
  }

  .project{ padding:32px 0 36px; }
  .project-head{
    grid-template-columns:40px 1fr;
    gap:14px;
  }
  .project-title{ font-size:18px; }
  .project-desc,
  .project-highlights,
  .stack{
    margin-left:54px;
    max-width:none;
  }

  .career li{
    grid-template-columns:1fr auto;
    gap:4px 16px;
  }
  .career-year{ grid-column:1 / -1; font-size:11px; }
  .career-span{ grid-column:2; grid-row:2; }

  .skill-group{
    grid-template-columns:1fr;
    gap:4px;
  }

  .contact-row{
    grid-template-columns:80px 1fr auto;
    gap:12px;
  }
  .contact-v{ font-size:12.5px; word-break:break-all; }
}

@media (max-width: 480px){
  .project-head{ grid-template-columns:1fr; gap:4px; }
  .project-index{ padding-top:0; }
  .project-desc,
  .project-highlights,
  .stack{ margin-left:0; }
  .project-highlights li{ grid-template-columns:28px 1fr; }
}