:root{--color-bg: #0a0a0a;--color-surface: #141414;--color-border: #262626;--color-text: #e5e5e5;--color-text-muted: #a3a3a3;--color-accent: #3b82f6;--color-accent-hover: #60a5fa;--color-card: #1a1a1a;--max-width: 800px}@media(prefers-color-scheme:light){:root:not([data-theme=dark]){--color-bg: #ffffff;--color-surface: #f5f5f5;--color-border: #e0e0e0;--color-text: #1a1a1a;--color-text-muted: #666666;--color-accent: #2563eb;--color-accent-hover: #1d4ed8;--color-card: #f0f0f0}}:root[data-theme=light]{--color-bg: #ffffff;--color-surface: #f5f5f5;--color-border: #e0e0e0;--color-text: #1a1a1a;--color-text-muted: #666666;--color-accent: #2563eb;--color-accent-hover: #1d4ed8;--color-card: #f0f0f0}:root[data-theme=dark]{--color-bg: #0a0a0a;--color-surface: #141414;--color-border: #262626;--color-text: #e5e5e5;--color-text-muted: #a3a3a3;--color-accent: #3b82f6;--color-accent-hover: #60a5fa;--color-card: #1a1a1a}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;font-size:clamp(15px,2.5vw,18px)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.7;min-height:100vh;display:flex;flex-direction:column;-webkit-text-size-adjust:100%;transition:background .2s,color .2s}.progress-bar{position:fixed;top:0;left:0;height:3px;width:0;background:var(--color-accent);z-index:100;transition:width .1s linear}.back-to-top{position:fixed;bottom:2rem;right:1.5rem;width:44px;height:44px;border-radius:50%;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);font-size:1.2rem;cursor:pointer;opacity:0;transform:translateY(10px);transition:opacity .3s,transform .3s;pointer-events:none;z-index:50}.back-to-top.visible{opacity:1;transform:translateY(0);pointer-events:auto}.back-to-top:hover{background:var(--color-accent);border-color:var(--color-accent);color:#fff}.theme-toggle{margin-left:auto;background:none;border:1px solid var(--color-border);border-radius:6px;color:var(--color-text-muted);font-size:1rem;width:36px;height:36px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:border-color .2s,color .2s;flex-shrink:0}.theme-toggle:hover{border-color:var(--color-accent);color:var(--color-accent)}header{border-bottom:1px solid var(--color-border);padding:.75rem 1rem}nav{max-width:var(--max-width);margin:0 auto;display:flex;align-items:center;gap:.75rem}.back-link{display:flex;align-items:center;justify-content:center;color:var(--color-text-muted);transition:color .2s;margin-right:-.25rem}.back-link:hover{color:var(--color-accent)}.logo{font-size:1.15rem;font-weight:700;color:var(--color-text);text-decoration:none}.logo:hover{color:var(--color-accent)}.tagline{color:var(--color-text-muted);font-size:.8rem}main{max-width:var(--max-width);margin:0 auto;padding:1.5rem 1rem;flex:1;width:100%}footer{border-top:1px solid var(--color-border);padding:1.25rem 1rem;text-align:center;color:var(--color-text-muted);font-size:.75rem}.zgba-topnav{position:sticky;top:0;z-index:1000;display:flex;align-items:center;gap:.6rem;padding:.5rem 1rem;background:color-mix(in srgb,var(--color-surface) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--color-border);font-size:.85rem}.zgba-back{display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;border:1px solid var(--color-border);border-radius:6px;background:var(--color-card);color:var(--color-text);font-size:1rem;cursor:pointer;transition:border-color .15s}.zgba-back:hover{border-color:var(--color-accent)}.zgba-brand{font-weight:700;color:var(--color-text);white-space:nowrap}.zgba-links{display:flex;flex-wrap:wrap;gap:.35rem .9rem}.zgba-links a{color:var(--color-text-muted);white-space:nowrap;text-decoration:none}.zgba-links a:hover{color:var(--color-accent)}.zgba-links .zgba-current{color:var(--color-accent);font-weight:600}a{color:var(--color-accent);text-decoration:none}a:hover{color:var(--color-accent-hover);text-decoration:underline}h1,h2,h3{line-height:1.3;margin-top:1.5rem;margin-bottom:.75rem}h1{font-size:1.75rem}h2{font-size:1.3rem;border-bottom:1px solid var(--color-border);padding-bottom:.5rem}h3{font-size:1.05rem;color:var(--color-text)}p{margin-bottom:.75rem}hr{border:none;border-top:1px solid var(--color-border);margin:2rem 0}blockquote{border-left:3px solid var(--color-accent);padding-left:1rem;color:var(--color-text-muted);margin-bottom:1rem}ul,ol{padding-left:1.5rem;margin-bottom:1rem}li{margin-bottom:.25rem}code{background:var(--color-surface);padding:.15rem .4rem;border-radius:3px;font-size:.9em}@media(max-width:640px){main{padding:1rem .75rem}h2{font-size:1.15rem}h3{font-size:1rem}.back-to-top{bottom:1.25rem;right:1rem}}