:root{color-scheme:light;--bg: #f5f7fa;--surface: #ffffff;--surface-soft: #edf3f2;--border: #d9e1e7;--text: #18202c;--muted: #627083;--accent: #186f65;--accent-strong: #0c554f;--accent-soft: #e2f4f1;--danger: #a64036;--shadow: 0 18px 45px rgba(24, 32, 44, .08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}button{border:0;cursor:pointer}button:disabled,select:disabled{cursor:not-allowed;opacity:.55}.app-header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:22px 28px;border-bottom:1px solid var(--border);background:#ffffffe6;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);position:sticky;top:0;z-index:4}.eyebrow{margin:0 0 4px;color:var(--accent);font-size:12px;font-weight:800;letter-spacing:0;text-transform:uppercase}h1,h2{margin:0}h1{font-size:clamp(24px,3vw,36px);line-height:1.1}h2{font-size:20px}.header-actions,.template-actions,.panel-toolbar,.preview-toolbar,.tabs{display:flex;align-items:center;gap:12px}.workspace{display:grid;grid-template-columns:minmax(460px,.98fr) minmax(420px,1.02fr);gap:18px;padding:18px;min-height:calc(100vh - 86px)}.editor-panel,.preview-panel{min-width:0;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);overflow:hidden}.editor-panel{display:flex;flex-direction:column}.panel-toolbar{align-items:flex-end;justify-content:space-between;padding:16px;border-bottom:1px solid var(--border)}.field{display:grid;gap:7px;min-width:0;flex:1}.field span,.toggle,.hint{color:var(--muted);font-size:13px}input,select,textarea{width:100%;border:1px solid var(--border);background:#fff;color:var(--text);outline:none}input,select{min-height:40px;padding:0 11px}input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.tabs{padding:10px 16px 0;border-bottom:1px solid var(--border)}.tab-button{min-width:94px;padding:10px 14px;color:var(--muted);background:transparent;border-bottom:3px solid transparent}.tab-button.is-active{color:var(--accent-strong);border-color:var(--accent);font-weight:800}.tab-panel{display:none;flex:1;min-height:0}.tab-panel.is-active{display:flex;flex-direction:column}textarea{flex:1;min-height:560px;padding:16px;resize:none;border:0;border-radius:0;line-height:1.55;font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace;font-size:14px}.template-actions{flex-wrap:wrap;padding:14px 16px;border-bottom:1px solid var(--border)}.template-actions input{flex:1 1 210px}.hint{margin:0;padding:10px 16px 14px;border-top:1px solid var(--border);line-height:1.6}.hint code{color:var(--accent-strong);font-family:SFMono-Regular,Consolas,Liberation Mono,Menlo,monospace}.preview-panel{display:flex;flex-direction:column}.preview-toolbar{justify-content:space-between;padding:16px;border-bottom:1px solid var(--border)}.toggle{display:inline-flex;align-items:center;gap:8px;white-space:nowrap}.toggle input{width:18px;min-height:18px;accent-color:var(--accent)}iframe{flex:1;width:100%;min-height:660px;border:0;background:#fff}.primary-button,.icon-button,.template-actions button{min-height:40px;padding:0 14px;background:var(--accent);color:#fff;font-weight:800}.primary-button:hover,.icon-button:hover,.template-actions button:hover{background:var(--accent-strong)}.icon-button{width:42px;padding:0;font-size:22px;line-height:1}#deleteTemplateBtn{background:#fff;color:var(--danger);border:1px solid #e5c4bf}#deleteTemplateBtn:hover:not(:disabled){background:#fff4f2}.toast{position:fixed;right:18px;bottom:18px;transform:translateY(18px);opacity:0;pointer-events:none;max-width:min(360px,calc(100vw - 36px));padding:12px 14px;background:#18202c;color:#fff;box-shadow:var(--shadow);transition:opacity .16s ease,transform .16s ease}.toast.is-visible{opacity:1;transform:translateY(0)}@media(max-width:1040px){.workspace{grid-template-columns:1fr}.app-header,.panel-toolbar,.preview-toolbar{align-items:stretch;flex-direction:column}.header-actions{justify-content:flex-start}textarea,iframe{min-height:450px}}@media(max-width:560px){.app-header,.workspace{padding:14px}.workspace{gap:14px}.tabs{overflow-x:auto}.tab-button{min-width:82px}}