:root{--bg: #f7f8fa;--fg: #1f2329;--muted: #6b7280;--card: #ffffff;--accent: #2f6fed;--border: #e5e7eb;--tag-bg: #eef2ff;--tag-fg: #2f6fed}.app.dark{--bg: #0f1115;--fg: #e6e8eb;--muted: #9aa3af;--card: #171a21;--accent: #5b8cff;--border: #2a2f3a;--tag-bg: #1b2330;--tag-fg: #8fb2ff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--fg);transition:background .25s ease,color .25s ease}.app{min-height:100vh}.nav{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;padding:14px 24px;background:color-mix(in srgb,var(--bg) 85%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.nav-brand{font-weight:700;letter-spacing:.3px}.nav-links{display:flex;align-items:center;gap:18px}.nav-links a{color:var(--muted);text-decoration:none;font-size:14px}.nav-links a:hover{color:var(--accent)}.theme-btn{border:1px solid var(--border);background:transparent;color:var(--fg);border-radius:8px;width:32px;height:32px;cursor:pointer;font-size:15px}.hero{text-align:center;padding:72px 24px 56px}.hero h1{font-size:40px;margin:0 0 8px}.hero-sub{color:var(--accent);font-weight:600;margin:0 0 14px}.hero-tag{color:var(--muted);max-width:560px;margin:0 auto 24px;line-height:1.6}.hero-cta{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:11px 26px;border-radius:10px;font-weight:600}.hero-cta:hover{opacity:.92}.container{max-width:860px;margin:0 auto;padding:0 24px 48px}.section{padding:36px 0;border-top:1px solid var(--border)}.section-title{font-size:22px;margin:0 0 18px;position:relative;padding-left:12px}.section-title:before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:4px;border-radius:2px;background:var(--accent)}.section p{line-height:1.75;color:var(--fg)}.section strong{color:var(--accent)}.tags{display:flex;flex-wrap:wrap;gap:10px}.tag{background:var(--tag-bg);color:var(--tag-fg);padding:7px 14px;border-radius:999px;font-size:14px;font-weight:500}.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px 20px;transition:transform .15s ease,box-shadow .15s ease}.card:hover{transform:translateY(-3px);box-shadow:0 8px 24px #0000000f}.card h3{margin:0 0 8px;font-size:16px}.card p{margin:0;color:var(--muted);font-size:14px;line-height:1.65}.list{line-height:2;color:var(--fg);padding-left:20px}.contact-row{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.email{font-weight:600}.copy-btn{border:1px solid var(--accent);color:var(--accent);background:transparent;padding:8px 16px;border-radius:8px;cursor:pointer;font-weight:600}.copy-btn:hover{background:var(--accent);color:#fff}.footer{text-align:center;padding:28px 16px;border-top:1px solid var(--border);color:var(--muted);font-size:13px}.footer a{color:var(--muted);text-decoration:none}.footer a:hover{color:var(--accent)}@media(max-width:640px){.cards{grid-template-columns:1fr}.hero h1{font-size:30px}.nav-links{gap:12px}}