:root{--primary: #2563eb;--bg: #f3f4f6;--card: #ffffff;--text: #1f2937;--bubble-me: #2563eb;--bubble-them: #e5e7eb}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg);color:var(--text);overflow:hidden}.mobile-container{display:flex;flex-direction:column;height:100vh;max-width:600px;margin:0 auto;background:var(--bg)}.header{padding:1rem;background:#fff;border-bottom:1px solid #e5e7eb;display:flex;justify-content:space-between;align-items:center;z-index:10}.chat-area{flex:1;overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:.75rem}.message{max-width:80%;padding:.75rem 1rem;border-radius:1.25rem;font-size:.9375rem;position:relative}.message-me{align-self:flex-end;background:var(--bubble-me);color:#fff;border-bottom-right-radius:.25rem}.message-them{align-self:flex-start;background:var(--bubble-them);color:var(--text);border-bottom-left-radius:.25rem}.sender-name{font-size:.75rem;font-weight:600;margin-bottom:.25rem;color:var(--text-muted)}.input-area{padding:1rem;background:#fff;border-top:1px solid #e5e7eb;display:flex;gap:.5rem}input{flex:1;padding:.75rem;border:1px solid #d1d5db;border-radius:1.5rem;outline:none}button.icon-btn{background:var(--primary);color:#fff;border:none;width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer}.settings-view{padding:2rem;display:flex;flex-direction:column;gap:1.5rem}.setting-card{background:#fff;padding:1.5rem;border-radius:1rem;box-shadow:0 1px 3px #0000001a}.label{display:block;font-size:.875rem;font-weight:600;margin-bottom:.5rem;color:#4b5563}.info-text{font-size:.8125rem;color:#6b7280;margin-top:.5rem}.overlay{position:absolute;inset:0;background:#000000b3;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:100;display:flex;align-items:center;justify-content:center;padding:1.5rem}.call-card,.modal{background:#fff;padding:2rem;border-radius:1.5rem;text-align:center;width:100%;max-width:320px;box-shadow:0 10px 25px #0003}.modal{text-align:left;max-width:400px}.pulse-icon{width:80px;height:80px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 1.5rem;animation:pulse 1.5s infinite}.pulse-icon.incoming{background:#10b981}.active-call-icon{width:80px;height:80px;background:#10b981;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 1.5rem}@keyframes pulse{0%{transform:scale(1);box-shadow:0 0 #2563ebb3}70%{transform:scale(1.1);box-shadow:0 0 0 15px #2563eb00}to{transform:scale(1);box-shadow:0 0 #2563eb00}}.icon-btn.end-call{background:#ef4444}.icon-btn.accept{background:#10b981}.icon-btn.small{width:32px;height:32px}.user-list{display:flex;flex-direction:column;gap:1rem;max-height:300px;overflow-y:auto}.user-item{display:flex;justify-content:space-between;align-items:center;padding:.75rem;background:#f9fafb;border-radius:.75rem}