:root{--hrzc-primary:#ef4444;--hrzc-primary-dark:#dc2626;--hrzc-primary-light:#ef44441a;--hrzc-text:#0f172a;--hrzc-text-muted:#64748b;--hrzc-text-light:#94a3b8;--hrzc-bg:#fff;--hrzc-bg-hover:#fff5f5;--hrzc-border:#e2e8f0;--hrzc-border-focus:#ef4444;--hrzc-radius:var(--main-radius);--hrzc-radius-lg:var(--main-radius-lg);--hrzc-shadow-sm:0 1px 3px #0000000f, 0 1px 2px #0000000a;--hrzc-shadow:0 4px 12px #ef44441a;--hrzc-focus-ring:0 0 0 3px #ef44441f;--hrzc-active-ring:0 0 0 2px #ef444433;--hrzc-zone1:#3b82f6;--hrzc-zone2:#10b981;--hrzc-zone3:#f59e0b;--hrzc-zone4:#f97316;--hrzc-zone5:#ef4444;--hrzc-zone1-bg:#3b82f61a;--hrzc-zone2-bg:#10b9811a;--hrzc-zone3-bg:#f59e0b1a;--hrzc-zone4-bg:#f973161a;--hrzc-zone5-bg:#ef44441a}._hrzc-container{gap:var(--main-space-4);flex-direction:column;max-width:720px;margin:0 auto;display:flex}._hrzc-panel,._hrzc-results{background:var(--hrzc-bg);border-radius:var(--hrzc-radius-lg);border-style:solid;border-width:1px;border-color:var(--hrzc-border);box-shadow:var(--hrzc-shadow-sm);padding:var(--main-space-6)}._hrzc-results{padding:0;overflow:hidden}._hrzc-placeholder{justify-content:center;align-items:center;gap:var(--main-space-3);padding:var(--main-space-10) var(--main-space-6);color:var(--hrzc-text-muted);text-align:center;flex-direction:column;display:flex}._hrzc-placeholder svg{opacity:.25;color:var(--hrzc-primary)}._hrzc-placeholder p{font-size:var(--main-text-sm);margin:0}._hrzc-zones-wrap{padding:var(--main-space-6);gap:var(--main-space-4);flex-direction:column;display:flex}@media (max-width:768px){._hrzc-container{padding-left:1rem;padding-right:1rem}._hrzc-panel,._hrzc-zones-wrap{padding:var(--main-space-4)}}._hrzc-inputs-row{gap:var(--main-space-4);margin-bottom:var(--main-space-5);grid-template-columns:1fr 1fr;display:grid}._hrzc-field-group{gap:var(--main-space-2);flex-direction:column;display:flex}._hrzc-label{align-items:center;gap:var(--main-space-2);font-size:var(--main-text-sm);color:var(--hrzc-text);font-weight:500;display:flex}._hrzc-label svg{color:var(--hrzc-primary);flex-shrink:0}._hrzc-label-optional{font-weight:400;font-size:var(--main-text-xs);color:var(--hrzc-text-muted);margin-left:auto}._hrzc-input-wrap{align-items:center;display:flex;position:relative}._hrzc-input{border-style:solid;border-width:1.5px;border-color:var(--hrzc-border);border-radius:var(--hrzc-radius);width:100%;font-size:var(--main-text-sm);color:var(--hrzc-text);background:var(--hrzc-bg);-webkit-appearance:textfield;appearance:textfield;padding:.5rem 3rem .5rem .75rem;transition:border-color .15s,box-shadow .15s}._hrzc-input::-webkit-inner-spin-button{-webkit-appearance:none}._hrzc-input::-webkit-outer-spin-button{-webkit-appearance:none}._hrzc-input:focus{border-color:var(--hrzc-border-focus);box-shadow:var(--hrzc-focus-ring);outline:none}._hrzc-input-unit{font-size:var(--main-text-xs);color:var(--hrzc-text-muted);pointer-events:none;position:absolute;right:.75rem}._hrzc-options-row{gap:var(--main-space-4);border-top-style:solid;border-top-width:1px;border-top-color:var(--hrzc-border);padding-top:var(--main-space-5);flex-direction:column;display:flex}._hrzc-option-group{gap:var(--main-space-2);flex-direction:column;display:flex}._hrzc-option-label{font-size:var(--main-text-sm);color:var(--hrzc-text);font-weight:500}._hrzc-toggle-group{gap:var(--main-space-2);flex-wrap:wrap;display:flex}._hrzc-toggle-btn{border-radius:var(--hrzc-radius);font-size:var(--main-text-sm);color:var(--hrzc-text-muted);border-style:solid;border-width:1.5px;border-color:var(--hrzc-border);cursor:pointer;background:0 0;padding:.375rem .875rem;font-weight:400;transition:color .15s,border-color .15s,background .15s,box-shadow .15s}._hrzc-toggle-btn:hover{color:var(--hrzc-text);background:#f8fafc;border-color:#cbd5e1}._hrzc-toggle-btn--active{color:var(--hrzc-primary);border-color:var(--hrzc-primary);background:var(--hrzc-primary-light);box-shadow:var(--hrzc-active-ring);font-weight:500}._hrzc-toggle-btn--active:hover{color:var(--hrzc-primary);border-color:var(--hrzc-primary);background:var(--hrzc-primary-light)}@media (max-width:600px){._hrzc-inputs-row{grid-template-columns:1fr}}._hrzc-mhr-bar{justify-content:space-between;align-items:center;gap:var(--main-space-4);padding:var(--main-space-4) var(--main-space-5);background:var(--hrzc-primary-light);border-radius:var(--hrzc-radius);border:1px solid #ef444433;display:flex}._hrzc-mhr-info{align-items:baseline;gap:var(--main-space-3);display:flex}._hrzc-mhr-label{font-size:var(--main-text-sm);color:var(--hrzc-text-muted);font-weight:500}._hrzc-mhr-value{font-size:var(--main-text-2xl);color:var(--hrzc-primary);font-variant-numeric:tabular-nums;font-weight:700}._hrzc-mhr-meta{font-size:var(--main-text-xs);color:var(--hrzc-text-muted);text-align:right}._hrzc-zones{gap:var(--main-space-2);flex-direction:column;display:flex}._hrzc-zone-row{border-radius:var(--hrzc-radius);border-style:solid;border-width:1px;border-color:var(--hrzc-border);box-shadow:var(--hrzc-shadow-sm);background:var(--hrzc-bg);transition:box-shadow .15s;overflow:hidden}._hrzc-zone-row--active{border-color:var(--hrzc-zone-color,var(--hrzc-primary));box-shadow:0 0 0 2px rgba(var(--hrzc-zone-color-rgb,239 68 68) / .2)}._hrzc-zone-header{align-items:center;gap:var(--main-space-3);padding:var(--main-space-3) var(--main-space-4);display:flex}._hrzc-zone-dot{background:var(--hrzc-zone-color,#94a3b8);border-radius:50%;flex-shrink:0;width:10px;height:10px}._hrzc-zone-num{font-size:var(--main-text-xs);color:var(--hrzc-zone-color,#94a3b8);text-transform:uppercase;letter-spacing:.04em;min-width:42px;font-weight:600}._hrzc-zone-name{font-size:var(--main-text-sm);color:var(--hrzc-text);flex:1;font-weight:600}._hrzc-zone-pct{font-size:var(--main-text-xs);color:var(--hrzc-text-muted);margin-right:var(--main-space-2)}._hrzc-zone-bpm{font-size:var(--main-text-sm);color:var(--hrzc-zone-color,#94a3b8);font-variant-numeric:tabular-nums;text-align:right;min-width:100px;font-weight:600}._hrzc-zone-track{background:#f1f5f9;height:5px;position:relative;overflow:hidden}._hrzc-zone-fill{background:var(--hrzc-zone-color,#94a3b8);opacity:.6;height:100%;transition:width .35s;position:absolute;top:0}._hrzc-zone-desc{font-size:var(--main-text-xs);color:var(--hrzc-text-muted);padding:0 var(--main-space-4) var(--main-space-3);padding-left:calc(var(--main-space-4) + 10px + var(--main-space-3) + 42px + var(--main-space-3));line-height:1.5}._hrzc-zone-row--active ._hrzc-zone-name{color:var(--hrzc-zone-color,var(--hrzc-primary))}._hrzc-zone-row--active ._hrzc-zone-fill{opacity:1}._hrzc-checker{gap:var(--main-space-3);padding:var(--main-space-4) var(--main-space-5);border-radius:var(--hrzc-radius);border-style:solid;border-width:1px;border-color:var(--hrzc-border);background:#f8fafc;flex-direction:column;display:flex}._hrzc-checker-label{align-items:center;gap:var(--main-space-2);font-size:var(--main-text-sm);color:var(--hrzc-text);font-weight:500;display:flex}._hrzc-checker-label svg{color:var(--hrzc-primary);flex-shrink:0}._hrzc-checker-row{align-items:center;gap:var(--main-space-3);flex-wrap:wrap;display:flex}._hrzc-checker-input-wrap{flex-shrink:0;width:130px}._hrzc-checker-input{padding-right:2.75rem!important}._hrzc-checker-result{font-size:var(--main-text-sm);color:var(--hrzc-text-muted);flex:1}._hrzc-checker-result-zone{align-items:center;gap:var(--main-space-2);font-weight:600;display:inline-flex}._hrzc-checker-result-dot{border-radius:50%;flex-shrink:0;width:8px;height:8px}._hrzc-checker-result-below,._hrzc-checker-result-above{color:var(--hrzc-text-muted);font-style:italic}@media (max-width:600px){._hrzc-zone-bpm{min-width:auto}._hrzc-zone-desc{padding-left:var(--main-space-4)}._hrzc-mhr-bar{flex-direction:column;align-items:flex-start}._hrzc-mhr-meta{text-align:left}._hrzc-checker-row{flex-direction:column;align-items:flex-start}._hrzc-checker-input-wrap{width:100%}}