:root{--zycs-color-primary:#18181b;--zycs-color-accent:#2563eb;--zycs-color-surface:#fff;--zycs-color-soft:#f4f4f5;--zycs-color-line:#e4e4e7;--zycs-color-line-secondary:#ececee;--zycs-text-primary:#000000e6;--zycs-text-secondary:#0009;--zycs-text-tertiary:#0000006b;--zycs-color-success:#16a34a;--zycs-color-warning:#d97706;--zycs-color-error:#dc2626;--zycs-radius-control:2px;--zycs-radius-bubble:4px;--zycs-radius-region:0;--zycs-font-size-xs:12px;--zycs-font-size-sm:14px;--zycs-font-size-body:14px;--zycs-font-size-md:16px;--zycs-font-size-lg:20px;--zycs-font-size-xl:24px;--zycs-control-height:32px;--zycs-control-height-compact:28px;--zycs-touch-target:44px;--zycs-button-min-height:40px;color:var(--zycs-text-primary);background:var(--zycs-color-surface);font-family:Inter,PingFang SC,Microsoft YaHei,sans-serif;font-size:var(--zycs-font-size-body)}*{box-sizing:border-box}body{background:var(--zycs-color-surface);min-width:320px;color:var(--zycs-text-primary);margin:0}button,select,textarea{font:inherit}button{background:var(--zycs-color-primary);border-radius:var(--zycs-radius-control);color:#fff;cursor:pointer;min-height:var(--zycs-button-min-height);border:0;justify-content:center;align-items:center;padding:0 16px;display:inline-flex}button:disabled{cursor:not-allowed;opacity:.58}button:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--zycs-color-accent);outline-offset:1px}.page-shell{max-width:720px;min-height:100vh;margin:0 auto;padding:16px}.hero-card,.panel,.chat-card,.boundary-card,.error-card{background:var(--zycs-color-surface);border:1px solid var(--zycs-color-line);border-radius:var(--zycs-radius-region);margin-bottom:14px;padding:16px}.hero-card{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.eyebrow,.hero-copy,.chat-header p,.pack-summary p,.boundary-card p{color:var(--zycs-text-secondary);margin:0}.eyebrow{color:var(--zycs-text-tertiary);font-size:var(--zycs-font-size-xs);letter-spacing:.04em;text-transform:uppercase;font-weight:600}h1,h2{margin:6px 0}h1{font-size:var(--zycs-font-size-lg)}.status-pill,.demo-badge,.message-meta span,.summary-grid span{background:var(--zycs-color-soft);border-radius:var(--zycs-radius-control);color:var(--zycs-text-secondary);font-size:var(--zycs-font-size-xs);white-space:nowrap;padding:5px 9px;font-weight:600;display:inline-flex}.demo-badge{background:color-mix(in srgb, var(--zycs-color-success) 12%, var(--zycs-color-surface));color:var(--zycs-color-success)}.scenario-panel{grid-template-columns:auto 1fr auto;align-items:center;gap:10px;display:grid}.scenario-panel label{font-weight:600}.scenario-panel select{background:var(--zycs-color-surface);border:1px solid var(--zycs-color-line-secondary);border-radius:var(--zycs-radius-control);color:var(--zycs-text-primary);min-height:var(--zycs-touch-target);width:100%;padding:8px 12px}.summary-grid{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.chat-header{border-bottom:1px solid var(--zycs-color-line);justify-content:space-between;align-items:flex-start;margin-bottom:12px;padding-bottom:12px;display:flex}.message-list{flex-direction:column;gap:10px;min-height:240px;display:flex}.empty-state{border:1px dashed var(--zycs-color-line-secondary);border-radius:var(--zycs-radius-region);color:var(--zycs-text-secondary);text-align:center;justify-content:center;align-items:center;min-height:180px;padding:24px;display:flex}.message{border-radius:var(--zycs-radius-bubble);max-width:88%;padding:12px 14px}.message p{white-space:pre-wrap;margin:0}.message.customer{background:var(--zycs-color-primary);color:#fff;align-self:flex-end}.message.assistant{background:var(--zycs-color-soft);border:1px solid var(--zycs-color-line-secondary);align-self:flex-start}.message-meta{flex-wrap:wrap;gap:6px;margin-top:10px;display:flex}.quick-questions{flex-wrap:wrap;gap:8px;margin:14px 0;display:flex}.quick-questions button{background:var(--zycs-color-surface);border:1px solid var(--zycs-color-line-secondary);color:var(--zycs-text-primary);min-height:var(--zycs-touch-target);padding:0 12px}.quick-questions button:hover:not(:disabled){background:var(--zycs-color-soft)}.composer{grid-template-columns:1fr auto;gap:10px;display:grid}.composer textarea{background:var(--zycs-color-surface);border:1px solid var(--zycs-color-line-secondary);border-radius:var(--zycs-radius-control);color:var(--zycs-text-primary);resize:vertical;width:100%;min-height:72px;padding:10px 12px}.error-card{border-color:color-mix(in srgb, var(--zycs-color-error) 40%, var(--zycs-color-line));color:var(--zycs-color-error)}.boundary-card{background:color-mix(in srgb, var(--zycs-color-warning) 8%, var(--zycs-color-surface));border-left:2px solid var(--zycs-color-warning)}.icp-footer{margin-top:var(--zycs-space-md,16px);text-align:center;font-size:var(--zycs-font-size-xs);padding:4px 0 24px}.icp-footer a{color:var(--zycs-text-tertiary);text-decoration:none}@media (width<=560px){.hero-card,.chat-header{display:block}.status-pill,.demo-badge{margin-top:10px}.scenario-panel,.composer{grid-template-columns:1fr}.message{max-width:100%}}