:root{
  --bg:#f7f8fa; --surface:#ffffff; --fg:#1f2937; --muted:#6b7280;
  --border:#e5e7eb; --accent:#2563eb;
  --cat-profile:#8b5cf6; --cat-exp:#10b981; --cat-learn:#f59e0b;
  --radius:14px;
  --shadow:0 1px 3px rgba(0,0,0,.06),0 8px 24px rgba(0,0,0,.04);
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.7;font-size:16px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:920px;margin:0 auto;padding:0 20px}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--border)}
.nav-inner{max-width:920px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:18px}
.brand{font-weight:700;font-size:18px;color:var(--fg)}
.brand:hover{text-decoration:none}
.nav-links{margin-left:auto;display:flex;gap:16px}
.nav-links a{color:var(--muted);font-size:15px}
.nav-links a.active{color:var(--accent);font-weight:600}

/* hero */
.hero{padding:44px 0 20px}
.hero h1{font-size:30px;margin:0 0 8px}
.hero p{color:var(--muted);margin:0;max-width:640px}

/* cards */
.grid{display:grid;gap:16px}
.post-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;box-shadow:var(--shadow);transition:transform .15s ease,box-shadow .15s ease}
.post-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.08),0 16px 40px rgba(0,0,0,.06)}
.post-card h3{margin:0 0 6px;font-size:19px}
.post-card .meta{color:var(--muted);font-size:13px;margin-bottom:8px;display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.post-card p{margin:0;color:#374151}

/* chips */
.chip{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:600;color:#fff}
.chip-profile{background:var(--cat-profile)}
.chip-exp{background:var(--cat-exp)}
.chip-learn{background:var(--cat-learn)}

/* sections */
.section-title{font-size:20px;margin:30px 0 14px;display:flex;align-items:center;gap:10px}
.section-title::before{content:"";width:4px;height:18px;background:var(--accent);border-radius:2px}

/* category list */
.cat-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.cat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.cat-card h3{margin:0 0 6px}
.cat-card .count{color:var(--muted);font-size:13px}
.cat-card ul{margin:8px 0 0;padding-left:18px;color:#374151;font-size:14px}

/* archive */
.year{font-size:22px;font-weight:700;margin:24px 0 10px}
.timeline{border-left:2px solid var(--border);padding-left:18px;margin-left:6px}
.tl-item{margin:10px 0}
.tl-date{color:var(--muted);font-size:13px;margin-right:10px}

/* post page */
.post-header{padding:32px 0 8px}
.post-header h1{font-size:27px;margin:0 0 8px}
.post-body{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:8px 8px 0;box-shadow:var(--shadow);margin:16px 0 40px}
.article-frame{width:100%;border:0;min-height:1000px;display:block}

/* footer */
.footer{border-top:1px solid var(--border);padding:24px 0;color:var(--muted);font-size:13px;text-align:center;margin-top:40px}

/* access gate removed: 站点已设为公开，无需密码门 */

@media(max-width:640px){.hero h1{font-size:24px}.nav-links{gap:12px}}