:root{--color-primary:#0f172a;--color-primary-light:#1e293b;--color-accent:#38bdf8;--color-accent-glow:rgba(56,189,248,.5);--text-main:#f8fafc;--text-muted:#94a3b8;--text-inverse:#0f172a;--gradient-bg:linear-gradient(135deg,#0f172a,#1e293b);--gradient-card:linear-gradient(180deg,rgba(30,41,59,.7),rgba(30,41,59,.4));--gradient-button:linear-gradient(90deg,#38bdf8,#0ea5e9);--radius-sm:8px;--radius-md:12px;--radius-lg:20px;--radius-full:9999px;--header-height:60px;--nav-height:70px;--transition-fast:0.2s cubic-bezier(0.4,0,0.2,1);--transition-smooth:0.4s cubic-bezier(0.4,0,0.2,1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--color-primary);color:var(--text-main);-webkit-font-smoothing:antialiased;min-height:100vh;padding-bottom:var(--nav-height);background:var(--gradient-bg);background-attachment:fixed}h1,h2,h3{font-weight:700;letter-spacing:-.02em}h1{font-size:2rem;margin-bottom:.5rem}h2{font-size:1.5rem;margin-bottom:1rem}p{line-height:1.6;color:var(--text-muted)}.container{max-width:600px;margin:0 auto;padding:20px}.card{background:var(--gradient-card);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid hsla(0,0%,100%,.05);border-radius:var(--radius-lg);padding:20px;margin-bottom:16px;box-shadow:0 4px 20px rgba(0,0,0,.2);transition:transform var(--transition-fast)}.card:active{transform:scale(.98)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;border-radius:var(--radius-full);font-weight:600;cursor:pointer;border:none;transition:all var(--transition-fast);text-decoration:none;font-size:1rem}.btn-primary{background:var(--gradient-button);color:var(--text-inverse);box-shadow:0 4px 12px var(--color-accent-glow)}.btn-primary:active{transform:scale(.96);box-shadow:0 2px 6px var(--color-accent-glow)}.btn-ghost{background:transparent;color:var(--text-muted)}.btn-secondary{background:hsla(0,0%,100%,.1);color:var(--text-main);border:1px solid hsla(0,0%,100%,.2)}.btn-secondary:active{transform:scale(.96);background:hsla(0,0%,100%,.15)}.header{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:rgba(15,23,42,.8);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:15px 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid hsla(0,0%,100%,.05)}input,textarea{width:100%;background:rgba(0,0,0,.2);border:1px solid hsla(0,0%,100%,.1);padding:12px 16px;border-radius:var(--radius-md);color:#fff;margin-bottom:10px;font-family:inherit}input:focus,textarea:focus{outline:none;border-color:var(--color-accent);background:rgba(0,0,0,.3)}.fade-in{animation:fadeIn .5s ease-out forwards;opacity:0}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.avatar{width:48px;height:48px;border-radius:50%;background:hsla(0,0%,100%,.1);display:flex;align-items:center;justify-content:center;font-weight:700;border:1px solid hsla(0,0%,100%,.34);box-shadow:0 4px 12px rgba(0,0,0,.1);transition:all var(--transition-fast)}.avatar,.avatar:active,.avatar:hover{color:var(--text-main);text-decoration:none!important}.avatar:active,.avatar:hover{transform:scale(1.05);background:hsla(0,0%,100%,.15);border-color:hsla(0,0%,100%,.5)}.avatar.guest svg{width:24px;height:24px}