.panel{display:block!important;background:linear-gradient(180deg,rgba(255,255,255,.96),rgba(248,251,255,.94))!important;border:1px solid #e2eaf2!important;border-radius:22px!important;padding:28px 28px 24px!important;box-shadow:0 12px 28px rgba(148,163,184,.1)!important;position:relative!important;overflow:hidden!important}
.panel::before{content:""!important;position:absolute!important;inset:0 0 auto 0!important;height:5px!important;pointer-events:none!important;background:linear-gradient(90deg,#64b5f6 0%,#81c784 35%,#ffb74d 68%,#e57373 100%)!important}
.call-stack{display:flex;flex-direction:column;align-items:center;gap:0;margin:16px 0}
.call-frame{padding:10px 20px;border-radius:10px;font-size:13px;font-weight:700;text-align:center;min-width:200px;border:2px solid #64b5f6;background:#e3f2fd;color:#1565c0;transition:all .3s;font-family:"Consolas",monospace}
.call-frame.active{background:#fff3e0;border-color:#ffb74d;color:#e65100;transform:scale(1.05)}
.call-frame.done{background:#e8f5e9;border-color:#66bb6a;color:#2e7d32}
.call-arrow{width:2px;height:16px;background:#90a4ae;position:relative}
.call-arrow::after{content:"▼";position:absolute;bottom:-8px;left:50%;transform:translateX(-50%);color:#90a4ae;font-size:10px}
.call-arrow.up{transform:rotate(180deg)}