:root{
  --bg:#f5f7fb; --card:#ffffff; --ink:#1f2933; --muted:#6b7280;
  --primary:#2b6cb0; --primary-d:#1d4e89; --line:#e6ebf2;
  --c-email:#2b6cb0; --c-video:#d97706; --c-ops:#059669; --c-design:#7c3aed;
  --radius:14px; --shadow:0 2px 14px rgba(20,40,80,.07);
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:15px}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.topbar .inner{max-width:1080px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:12px}
.brand{font-weight:700;font-size:17px;color:var(--ink);display:flex;align-items:center;gap:9px}
.brand .dot{width:11px;height:11px;border-radius:3px;background:var(--primary);display:inline-block;transform:rotate(45deg)}
.brand small{font-weight:500;color:var(--muted);font-size:12px}
.topbar .spacer{flex:1}
.topbar .navlink{color:var(--muted);font-size:14px;margin-left:6px}

/* ---------- hero (index) ---------- */
.hero{max-width:1080px;margin:0 auto;padding:46px 20px 14px}
.hero h1{font-size:30px;margin:0 0 10px;letter-spacing:.5px}
.hero p{color:var(--muted);margin:0 0 22px;font-size:15px;max-width:680px}
.search{display:flex;align-items:center;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 16px;max-width:560px;box-shadow:var(--shadow)}
.search input{border:0;outline:0;flex:1;font-size:15px;padding:8px 6px;background:transparent;color:var(--ink)}
.search svg{flex:none;opacity:.5}

/* ---------- layout ---------- */
.wrap{max-width:1080px;margin:0 auto;padding:10px 20px 60px}
.section-title{font-size:14px;color:var(--muted);font-weight:600;letter-spacing:1px;margin:30px 4px 14px;text-transform:uppercase}

/* category chips */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin:0 4px 6px}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 16px;font-size:14px;color:var(--muted);cursor:pointer;transition:.15s;user-select:none}
.chip:hover{border-color:var(--primary);color:var(--primary)}
.chip.active{background:var(--primary);border-color:var(--primary);color:#fff}

/* article grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px;margin-top:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 20px 18px;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:.15s;min-height:150px}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 22px rgba(20,40,80,.12)}
.card .tag{display:inline-block;font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;margin-bottom:12px;align-self:flex-start}
.card h3{margin:0 0 8px;font-size:16.5px;line-height:1.45}
.card p{margin:0 0 14px;color:var(--muted);font-size:13.5px;flex:1}
.card .meta{font-size:12px;color:#9aa3b0;display:flex;gap:8px;flex-wrap:wrap}
.card .meta span{background:#f1f4f9;border-radius:6px;padding:2px 8px}
.cat-域名邮箱 .tag{background:#e7f0fb;color:var(--c-email)}
.cat-AI短视频带货 .tag{background:#fdf0e3;color:var(--c-video)}
.cat-站点运营 .tag{background:#e3f6ee;color:var(--c-ops)}
.cat-设计工具 .tag{background:#f1e9fd;color:var(--c-design)}

.empty{color:var(--muted);text-align:center;padding:40px;font-size:14px}

/* ---------- article page ---------- */
.article{max-width:820px;margin:0 auto;padding:28px 20px 70px}
.article .crumbs{font-size:13px;color:var(--muted);margin-bottom:18px}
.article .cat-pill{display:inline-block;font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;margin-bottom:14px}
.article h1{font-size:26px;margin:0 0 14px;line-height:1.35}
.article .lead{color:var(--muted);font-size:15px;margin:0 0 24px}
.article h2{font-size:19px;margin:30px 0 12px;padding-left:11px;border-left:4px solid var(--primary)}
.article h3{font-size:16px;margin:22px 0 8px}
.article p,.article li{font-size:15px}
.article ul,.article ol{padding-left:22px}
.article .box{background:#f0f7ff;border:1px solid #cfe3ff;border-radius:10px;padding:14px 18px;margin:14px 0;font-size:14.5px}
.article .warn{background:#fff8f0;border:1px solid #ffe0b0;border-radius:10px;padding:14px 18px;margin:14px 0;font-size:14px}
.article .danger{background:#fef2f2;border:1px solid #fecaca;border-radius:10px;padding:14px 18px;margin:14px 0;font-size:14px}
.article code{background:#eef2f7;border-radius:5px;padding:1px 6px;font-size:13px;font-family:"SFMono-Regular",Consolas,monospace}
.article pre{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:16px 18px;overflow:auto;font-size:13px;line-height:1.6}
.article pre code{background:none;color:inherit;padding:0}
.article table{width:100%;border-collapse:collapse;font-size:14px;margin:14px 0}
.article th,.article td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.article th{background:#f0f4fa;font-weight:600}
.article .step{display:inline-block;background:var(--primary);color:#fff;min-width:24px;height:24px;line-height:24px;text-align:center;border-radius:50%;font-size:13px;margin-right:8px;padding:0 6px}
.article .click{background:#eaf1fb;border:1px solid #cfe0f5;border-radius:8px;padding:12px 16px;margin:12px 0;font-size:14.5px;line-height:1.85}
.ph{color:#b91c1c;font-weight:600}

/* footer */
.foot{max-width:1080px;margin:0 auto;padding:26px 20px 50px;color:#9aa3b0;font-size:12.5px;border-top:1px solid var(--line);margin-top:30px}
@media(max-width:560px){.hero h1{font-size:24px}.grid{grid-template-columns:1fr}}