:root{--bg-color: #0d1117;--surface-color: #161b22;--surface-border: #30363d;--text-main: #f0f6fc;--text-muted: #8b949e;--accent-cyan: #38bdf8;--accent-rose: #f43f5e;--accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #f43f5e 100%);--font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--radius-lg: 16px;--radius-md: 10px;--max-width: 680px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-main);font-family:var(--font-family);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2rem 1.25rem;background-image:radial-gradient(at 10% 20%,rgba(56,189,248,.08) 0px,transparent 50%),radial-gradient(at 90% 80%,rgba(244,63,94,.08) 0px,transparent 50%)}.container{width:100%;max-width:var(--max-width);margin:0 auto}.badge{display:inline-flex;align-items:center;gap:.5rem;padding:.35rem .85rem;font-size:.825rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--accent-cyan);background:#38bdf81a;border:1px solid rgba(56,189,248,.25);border-radius:9999px;margin-bottom:1.5rem}.badge-dot{width:8px;height:8px;border-radius:50%;background:var(--accent-cyan);box-shadow:0 0 10px var(--accent-cyan)}.brand{font-size:clamp(2.5rem,8vw,4rem);font-weight:800;letter-spacing:-.03em;line-height:1.1;margin-bottom:.75rem}.brand-gradient{background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.tagline{font-size:clamp(1.15rem,3.5vw,1.35rem);font-weight:500;color:var(--text-main);margin-bottom:1rem}.description{color:var(--text-muted);font-size:1rem;line-height:1.65;margin-bottom:2.25rem}.card{background:var(--surface-color);border:1px solid var(--surface-border);border-radius:var(--radius-lg);padding:1.75rem;box-shadow:0 20px 40px -15px #00000080;margin-bottom:2rem}.card-title{font-size:1.15rem;font-weight:700;margin-bottom:.5rem}.card-subtitle{font-size:.9rem;color:var(--text-muted);margin-bottom:1.25rem}.signup-form{display:flex;flex-direction:column;gap:.85rem}.form-row{display:flex;gap:.75rem}@media(max-width:540px){.form-row{flex-direction:column}}.input-field{flex:1;background:#0d1117;border:1px solid var(--surface-border);border-radius:var(--radius-md);padding:.85rem 1rem;color:var(--text-main);font-size:.95rem;outline:none;transition:border-color .2s}.input-field:focus{border-color:var(--accent-cyan)}.btn-primary{background:var(--accent-gradient);color:#0b0f19;font-weight:700;border:none;border-radius:var(--radius-md);padding:.85rem 1.5rem;font-size:.95rem;cursor:pointer;transition:opacity .2s,transform .1s;white-space:nowrap}.btn-primary:hover{opacity:.92;transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.form-feedback{font-size:.85rem;margin-top:.5rem;color:var(--accent-cyan);display:none}.topics{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem}.topic-tag{background:#ffffff0a;border:1px solid var(--surface-border);padding:.35rem .75rem;border-radius:9999px;font-size:.825rem;color:var(--text-muted)}footer{text-align:center;font-size:.85rem;color:var(--text-muted);margin-top:auto;padding-top:2rem}footer a{color:var(--text-main);text-decoration:underline;text-underline-offset:3px;transition:color .2s}footer a:hover{color:var(--accent-cyan)}