*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#f7f6f2;--surface:#fff;--surface2:#edecea;
  --border:rgba(0,0,0,.09);--text:#111110;--muted:#706f6a;
  --accent:#1d4ed8;--accent-light:#eff6ff;
  --tag-bg:#ececea;--tag-text:#3a3935;
  --green:#16a34a;--green-bg:#dcfce7;--green-text:#15803d;
  --radius:14px;--ease:.5s cubic-bezier(.4,0,.2,1);
}
body.dark{
  --bg:#0e0e0d;--surface:#1a1917;--surface2:#222120;
  --border:rgba(255,255,255,.07);--text:#edece8;--muted:#888780;
  --accent:#60a5fa;--accent-light:#172033;
  --tag-bg:#232220;--tag-text:#c2c0b8;
  --green-bg:#14532d;--green-text:#4ade80;
}

html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:'Inter',sans-serif;
  background:var(--bg);color:var(--text);
  min-height:100vh;overflow-x:hidden;
  transition:background var(--ease),color var(--ease);
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:900px;margin:0 auto;padding:32px 18px 80px}

.top-bar{
  display:flex;align-items:flex-start;
  justify-content:space-between;
  margin-bottom:28px;gap:12px;
}
.back-link{
  font-size:12.5px;font-weight:600;color:var(--muted);
  display:inline-flex;align-items:center;gap:4px;
  transition:color .2s;margin-bottom:6px;
}
.back-link:hover{color:var(--accent);text-decoration:none}
.page-title{font-size:clamp(20px,4vw,28px);font-weight:800;letter-spacing:-.5px}
.page-sub{font-size:13px;color:var(--muted);margin-top:4px;font-weight:500}

.theme-toggle{
  width:36px;height:36px;border-radius:50%;
  background:var(--surface2);border:.5px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;font-size:15px;flex-shrink:0;
  transition:background .3s,transform .2s;
}
.theme-toggle:hover{transform:scale(1.08);background:var(--surface)}

.summary-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:28px}
.s-chip{
  background:var(--surface);border:.5px solid var(--border);
  border-radius:10px;padding:12px 18px;flex:1;min-width:140px;
  transition:background var(--ease),border-color var(--ease);
}
.s-chip .num{font-size:26px;font-weight:800;color:var(--accent);letter-spacing:-1.5px;line-height:1}
.s-chip .lbl{font-size:11px;color:var(--muted);font-weight:500;margin-top:3px}

.section-title{
  font-size:11px;font-weight:700;color:var(--muted);
  text-transform:uppercase;letter-spacing:.08em;
  margin-bottom:10px;margin-top:32px;
  display:flex;align-items:center;gap:8px;
}
.section-title::after{content:'';flex:1;height:.5px;background:var(--border)}
.section-title:first-of-type{margin-top:0}

.timeline{display:flex;flex-direction:column;gap:0}

.tl-item{position:relative;padding-left:32px;padding-bottom:0}
.tl-item::before{
  content:'';position:absolute;left:9px;top:22px;bottom:0;
  width:.5px;background:var(--border);
  transition:background var(--ease);
}
.tl-item:last-child::before{display:none}

.tl-dot{
  position:absolute;left:0;top:16px;
  width:20px;height:20px;border-radius:50%;
  background:var(--surface);border:2px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-size:10px;z-index:1;
  transition:border-color .2s,background var(--ease);
}
.tl-item.active-item .tl-dot{border-color:var(--accent);background:var(--accent-light)}

.tl-card{
  background:var(--surface);border:.5px solid var(--border);
  border-radius:12px;padding:16px;margin-bottom:10px;
  cursor:pointer;
  transition:border-color .2s,background var(--ease);
  animation:fadeUp .35s ease both;
}
.tl-card:hover{border-color:var(--accent)}
.tl-item.active-item .tl-card{border-color:var(--accent)}

.tl-header{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.tl-title{font-size:14px;font-weight:700;margin-bottom:2px;line-height:1.35}
.tl-org{font-size:12.5px;color:var(--muted);font-weight:500;margin-bottom:6px}
.tl-meta{display:flex;flex-wrap:wrap;gap:5px}

.tl-right{text-align:right;flex-shrink:0}
.tl-period{
  font-size:10.5px;font-family:'DM Mono',monospace;
  background:var(--tag-bg);color:var(--muted);
  border-radius:5px;padding:3px 8px;white-space:nowrap;
  transition:background var(--ease),color var(--ease);
}
.tl-status{
  font-size:10px;font-weight:700;margin-top:5px;
  display:flex;align-items:center;justify-content:flex-end;gap:4px;
}
.tl-status.ongoing{color:var(--green-text)}
.tl-status.completed{color:var(--muted)}

.tl-tag{
  font-size:10.5px;background:var(--tag-bg);color:var(--tag-text);
  border-radius:5px;padding:2px 8px;font-family:'DM Mono',monospace;
  transition:background var(--ease),color var(--ease);
}
.tl-tag.accent{background:var(--accent-light);color:var(--accent)}

.tl-chevron{
  font-size:11px;color:var(--muted);
  transition:transform .25s;
  margin-left:6px;flex-shrink:0;line-height:1;margin-top:2px;
}
.tl-item.open .tl-chevron{transform:rotate(180deg)}

.tl-details{overflow:hidden;max-height:0;transition:max-height .35s cubic-bezier(.4,0,.2,1)}
.tl-item.open .tl-details{max-height:800px}
.tl-details-inner{padding:12px 0 4px}
.tl-desc{font-size:13px;color:var(--muted);line-height:1.75;margin-bottom:12px}

.tl-bullets{list-style:none;margin-bottom:12px}
.tl-bullets li{
  font-size:12.5px;color:var(--muted);line-height:1.65;
  padding:4px 0 4px 18px;position:relative;
  border-bottom:.5px solid var(--border);
}
.tl-bullets li:last-child{border-bottom:none}
.tl-bullets li::before{content:'→';position:absolute;left:0;color:var(--accent);font-size:11px}

.detail-label{font-size:10.5px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px;margin-top:10px}
.detail-tags{display:flex;flex-wrap:wrap;gap:5px}
.detail-tag{
  font-size:11px;background:var(--tag-bg);color:var(--tag-text);
  border-radius:5px;padding:3px 9px;font-family:'DM Mono',monospace;
  transition:background var(--ease),color var(--ease);
}
.detail-tag.accent{background:var(--accent-light);color:var(--accent)}

.detail-link{
  display:inline-flex;align-items:center;gap:5px;
  font-size:12px;font-weight:600;color:var(--accent);
  border:.5px solid var(--accent);border-radius:7px;
  padding:5px 12px;margin-top:12px;transition:background .18s;
}
.detail-link:hover{background:var(--accent-light);text-decoration:none}

.skills-card{
  background:var(--surface);border:.5px solid var(--border);
  border-radius:var(--radius);padding:20px;
  transition:background var(--ease),border-color var(--ease);
}
.skill-group{margin-bottom:16px}
.skill-group:last-child{margin-bottom:0}
.sg-label{font-size:11px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:8px}
.sg-tags{display:flex;flex-wrap:wrap;gap:6px}
.sg-tag{
  font-size:12px;background:var(--tag-bg);color:var(--tag-text);
  border-radius:6px;padding:4px 11px;font-weight:500;
  transition:background var(--ease),color var(--ease);
}
.sg-tag.accent{background:var(--accent-light);color:var(--accent)}
.sg-tag.learning{background:var(--green-bg);color:var(--green-text)}

footer{
  text-align:center;font-size:12px;color:var(--muted);
  margin-top:40px;padding-top:20px;border-top:.5px solid var(--border);
  line-height:1.6;font-weight:500;
  transition:color var(--ease),border-color var(--ease);
}

@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

@media(max-width:600px){
  .wrap{
    padding:18px 13px 80px;
    padding-left:max(13px,env(safe-area-inset-left));
    padding-right:max(13px,env(safe-area-inset-right));
    padding-bottom:max(80px,calc(60px + env(safe-area-inset-bottom)));
  }
  .page-title{font-size:20px}
  .summary-row{display:grid;grid-template-columns:1fr 1fr;gap:7px}
  .s-chip{min-width:0;padding:10px 14px}
  .s-chip .num{font-size:20px}
  .s-chip .lbl{font-size:10px}
  .tl-item{padding-left:26px}
  .tl-dot{width:18px;height:18px;font-size:9px;top:14px}
  .tl-item::before{left:8px;top:20px}
  .tl-header{flex-direction:column;gap:5px}
  .tl-right{display:flex;align-items:center;gap:8px;text-align:left}
  .tl-status{margin-top:0}
  .tl-card{padding:13px}
  .tl-title{font-size:13px}
  .tl-org{font-size:12px}
  .skills-card{padding:14px}
  .sg-tag{font-size:11px;padding:3px 9px}
}
@media(max-width:380px){
  .summary-row{grid-template-columns:1fr}
  .tl-item{padding-left:22px}
  .tl-dot{width:16px;height:16px;font-size:8px}
}
@media(prefers-reduced-motion:reduce){
  .tl-card{animation:none}
  *{transition-duration:.01ms!important}
}