:root{--bg:#0b0d12;--ink:#e8eaf0;--accent:#6ee7b7;--ink-dim:#8a90a0;--surface:#12151d;--border:#e8eaf01a;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;--font-mono:ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace}*,:before,:after{box-sizing:border-box}*{margin:0}html{-webkit-text-size-adjust:100%;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-height:100vh;line-height:1.5;font-family:var(--font-sans);color:var(--ink);background:var(--bg)}img,picture,video,canvas,svg{max-width:100%;display:block}input,button,textarea,select{font:inherit;color:inherit}p,h1,h2,h3,h4,h5,h6{overflow-wrap:break-word}#root{min-height:100vh}.btn{letter-spacing:.01em;cursor:pointer;border:1px solid #0000;border-radius:999px;align-items:center;gap:.6em;padding:.85em 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var(--border);flex-wrap:wrap;align-items:center;gap:.5rem 1.5rem;padding:1.5rem clamp(1.5rem,5vw,4rem);font-size:.85rem;display:flex;position:relative}.landing-foot-link{color:var(--ink-dim);border-bottom:1px solid #0000;text-decoration:none;transition:color .15s,border-color .15s}.landing-foot-link:hover{color:var(--accent);border-bottom-color:var(--accent)}.access-guide{justify-content:center;align-items:center;min-height:100vh;padding:2rem 1.25rem;display:flex;position:relative;overflow:hidden}.access-guide-glow{pointer-events:none;background:radial-gradient(600px 400px at 50% 12%,#6ee7b71f,#0000 60%),radial-gradient(700px 500px at 50% 100%,#6366f11a,#0000 60%);position:absolute;inset:0}.access-guide-box{text-align:center;max-width:34rem;position:relative}.access-guide-mark{margin-bottom:1.1rem;font-size:2rem}.access-guide-kicker{font-family:var(--font-mono);letter-spacing:.25em;text-transform:uppercase;color:var(--accent);margin-bottom:1.1rem;font-size:.8rem}.access-guide-title{letter-spacing:-.01em;font-size:clamp(1.5rem,3.5vw,2.1rem);font-weight:800;line-height:1.25}.access-guide-sub{color:var(--ink-dim);margin-top:.85rem;font-size:.95rem}.access-guide-join{color:var(--ink);margin-top:1.6rem;font-size:.95rem;line-height:1.7}.access-guide-join-zh{color:var(--ink-dim);font-size:.85rem}.access-guide-btn{margin-top:2rem;text-decoration:none;display:inline-flex}.access-guide-title--sm{font-size:clamp(1.25rem,2.6vw,1.6rem)}.access-spinner{border:2.5px solid #6ee7b738;border-top-color:var(--accent);border-radius:50%;width:2.1rem;height:2.1rem;margin:0 auto 1.3rem;animation:.8s linear infinite access-spin}@keyframes access-spin{to{transform:rotate(360deg)}}@media (prefers-reduced-motion:reduce){.access-spinner{animation-duration:2s}}.page-stub{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:.75rem;min-height:100vh;padding:2rem;display:flex}.page-stub h1{font-size:1.6rem;font-weight:700}.page-stub p{color:var(--ink-dim);font-family:var(--font-mono);font-size:.9rem}.fbk-fab{z-index:900;cursor:pointer;color:#a8cdfa;font-family:var(--font-sans);letter-spacing:.04em;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);opacity:.85;background:#0b0d12b8;border:1px solid #60a5fa80;border-radius:999px;padding:9px 18px;font-size:12.5px;line-height:1;transition:opacity .16s,box-shadow .16s;position:fixed;bottom:18px;right:18px}.fbk-fab:hover{opacity:1;box-shadow:0 0 14px #60a5fa4d}.fbk-card{z-index:901;background:var(--surface);width:min(320px,100vw - 36px);color:var(--ink);text-align:left;border:1px solid #60a5fa59;border-radius:12px;padding:16px;position:fixed;bottom:64px;right:18px;box-shadow:0 14px 44px #0009}.fbk-title{font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;color:#60a5fa;margin-bottom:10px;font-size:11px}.fbk-input{box-sizing:border-box;background:var(--bg);border:1px solid var(--border);width:100%;color:var(--ink);font:inherit;resize:vertical;border-radius:8px;margin-bottom:8px;padding:8px 10px;font-size:13px;display:block}.fbk-input:focus{border-color:#60a5fa99;outline:none}.fbk-input::placeholder{color:var(--ink-dim)}.fbk-row{justify-content:flex-end;gap:8px;margin-top:4px;display:flex}.fbk-btn{cursor:pointer;font-size:12.5px;font-family:var(--font-sans);border-radius:8px;padding:7px 16px}.fbk-cancel{border:1px solid var(--border);color:var(--ink-dim);background:0 0}.fbk-cancel:hover{border-color:var(--ink-dim);color:var(--ink)}.fbk-send{color:#fff;background:#2f7bd9;border:1px solid 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