:root{--bg:#050714;--card:#0d1226;--text:#e5e7eb;--muted:#9ca3af;--border:#1f2937;--pink:#ec4899;--blue:#6366f1;--green:#25d366;--danger:#ef4444}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,sans-serif;color:var(--text);background:var(--bg);overflow-x:hidden}
.video-background{position:fixed;top:0;left:0;width:100%;height:100%;z-index:0;overflow:hidden}
.video-background video{position:absolute;top:50%;left:50%;min-width:100%;min-height:100%;width:auto;height:auto;transform:translate(-50%,-50%);object-fit:cover}
.video-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(180deg,rgba(5,7,20,0.75) 0%,rgba(7,11,31,0.85) 50%,rgba(5,7,20,0.9) 100%);z-index:1}
header,main,footer,.whatsapp-float,.modal{position:relative;z-index:3}
header{padding:16px 20px;display:flex;justify-content:space-between}
nav a{color:var(--muted);text-decoration:none;font-size:14px}
main{padding:64px 20px 40px;text-align:center}
h1{font-size:34px;letter-spacing:-.02em}
.subtitle{margin:16px 0 48px;color:var(--muted)}
.prompt-box{position:relative;max-width:720px;margin:0 auto;min-height:190px;padding:24px 22px 70px;border-radius:20px;background:linear-gradient(180deg,#232538,#0C0A19);border:1px solid var(--border);box-shadow:0 40px 120px rgba(0,0,0,.7);overflow:hidden}
.prompt-text{text-align:left;line-height:1.7;color:var(--muted)}
.prompt-text span{color:var(--text);position:relative;display:inline-block}
.shimmer::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,transparent 35%,rgba(255,255,255,.18),transparent 65%);transform:translateX(-150%);animation:shimmer 3s infinite}
@keyframes shimmer{to{transform:translateX(150%)}}
.prompt-input{width:100%;min-height:60px;opacity:1;margin-top:12px;background:transparent;border:none;border-bottom:1px solid var(--border);color:var(--text);font-size:16px;outline:none;resize:vertical;transition:height .35s ease,opacity .25s ease}
.prompt-actions{position:absolute;right:16px;bottom:14px;display:flex;gap:10px}
.icon-btn{width:38px;height:38px;border-radius:50%;border:1px solid var(--border);background:#0f1533;color:#fff;cursor:pointer}
.icon-btn.send{background:linear-gradient(135deg,var(--pink),var(--blue));border:none}
.icon-btn.listening{background:linear-gradient(90deg,var(--pink),var(--blue),var(--pink));background-size:200% 200%;animation:micFlow 2s ease-in-out infinite}
.templates{margin:56px auto 0;max-width:720px;display:grid;grid-template-columns:1fr;gap:16px}
.template-btn{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:18px;cursor:pointer;transition:all 0.2s ease}
.template-btn:hover{background:#11173a;border-color:var(--pink);transform:translateY(-2px)}
footer{margin-top:72px;padding:22px 12px;border-top:1px solid var(--border);text-align:center;color:var(--muted);font-size:13px}
.whatsapp-float{position:fixed;right:18px;bottom:18px;width:39px;height:39px;border-radius:50%;background:var(--green);display:flex;align-items:center;justify-content:center;box-shadow:0 0 0 rgba(37,211,102,.6);animation:pulse 2.5s infinite;z-index:10}
.whatsapp-float:hover{box-shadow:0 0 20px rgba(37,211,102,.9)}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(37,211,102,.6)}70%{box-shadow:0 0 0 18px rgba(37,211,102,0)}100%{box-shadow:0 0 0 0 rgba(37,211,102,0)}}
@keyframes micFlow{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.7);display:none;align-items:center;justify-content:center;z-index:20}
.modal-content{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:24px;width:90%;max-width:420px;text-align:center;position:relative;transition:transform 0.1s ease}
.modal-content h3{margin-top:0}
.modal-content input,.modal-content textarea{width:100%;margin-top:12px;background:#0f1533;border:1px solid var(--border);border-radius:10px;padding:10px;color:var(--text)}
.error{color:var(--danger);font-size:13px;margin-top:6px}
.success{display:none;text-align:center}
.modal-content button{margin-top:16px;width:100%;padding:12px;border:none;border-radius:12px;background:linear-gradient(135deg,var(--pink),var(--blue));color:#fff}

@media(min-width:768px){h1{font-size:48px}.templates{grid-template-columns:repeat(2,1fr)}}