:root{--ink:#20352f;--muted:#6f7d77;--green:#17765c;--green-dark:#0e5d47;--mint:#e8f4ef;--paper:#fff;--line:#9eaaa5;--bg:#f4f1ea}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--bg);font-family:"Microsoft YaHei","PingFang SC",sans-serif;line-height:1.6}.site-header{height:64px;display:flex;align-items:center;max-width:1240px;margin:auto;padding:0 24px}.brand{color:var(--ink);font-family:Georgia,"Songti SC",serif;font-weight:700;text-decoration:none;letter-spacing:.08em}.hero{text-align:center;padding:48px 20px 36px;background:radial-gradient(circle at 50% -30%,#fff 0,transparent 62%)}.eyebrow{display:inline-block;color:var(--green);font-size:13px;font-weight:700;letter-spacing:.16em;margin-bottom:12px}.hero h1{font:700 clamp(34px,5vw,56px)/1.15 Georgia,"STKaiti","KaiTi",serif;margin:0 0 14px;letter-spacing:.06em}.hero p{margin:0;color:var(--muted);font-size:16px}.workspace{width:min(1240px,calc(100% - 40px));margin:auto;display:grid;grid-template-columns:360px minmax(0,1fr);gap:28px;align-items:start}.panel{background:#fff;border:1px solid #e0ddd5;border-radius:14px;padding:24px;box-shadow:0 10px 35px rgba(41,55,49,.06)}.panel-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.panel-heading>div{display:flex;gap:9px;align-items:center}.panel h2,.preview-toolbar h2{font-size:16px;margin:0}.step{display:inline-grid;place-items:center;color:var(--green);background:var(--mint);font:700 11px/1 Georgia,serif;width:25px;height:25px;border-radius:50%;margin-right:8px}.counter{font-size:12px;color:var(--muted)}textarea{width:100%;resize:vertical;border:1px solid #d6dcd8;border-radius:9px;padding:12px 14px;font:18px/1.7 "STKaiti","KaiTi",serif;color:var(--ink);outline:0;transition:.2s}textarea:focus{border-color:var(--green);box-shadow:0 0 0 3px rgba(23,118,92,.1)}.hint,.status{font-size:12px;color:var(--muted);margin:6px 0 12px}.examples{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-size:12px;color:var(--muted);margin-bottom:22px}.examples button{border:0;background:#f3f5f3;color:#496159;border-radius:99px;padding:5px 9px;cursor:pointer}.examples button:hover{background:var(--mint);color:var(--green)}fieldset{border:0;padding:0;margin:0 0 22px}legend{font-weight:700;font-size:14px;margin-bottom:10px}.segmented{display:grid;gap:8px}.segmented.two{grid-template-columns:1fr 1fr}.segmented input,.mode-list input,.choice-list input{position:absolute;opacity:0}.segmented label span{display:flex;align-items:center;justify-content:center;gap:10px;height:48px;border:1px solid #d9dedb;border-radius:8px;cursor:pointer;font-size:14px}.segmented input:checked+span{color:var(--green);border-color:var(--green);background:var(--mint);font-weight:700}.grid-icon{width:22px;height:22px;border:1px solid currentColor;position:relative;background:linear-gradient(90deg,transparent 48%,currentColor 49%,currentColor 51%,transparent 52%),linear-gradient(0deg,transparent 48%,currentColor 49%,currentColor 51%,transparent 52%);opacity:.7}.grid-icon.mi:after,.grid-icon.mi:before{content:"";position:absolute;width:29px;height:1px;left:-4px;top:10px;background:currentColor;transform:rotate(45deg)}.grid-icon.mi:after{transform:rotate(-45deg)}.mode-list{display:grid;gap:8px}.mode-list label span{display:flex;flex-direction:column;border:1px solid #d9dedb;border-radius:8px;padding:9px 12px;cursor:pointer}.mode-list b{font-size:14px}.mode-list small{color:var(--muted)}.mode-list input:checked+span{border-color:var(--green);background:var(--mint);box-shadow:inset 3px 0 var(--green)}.layout-fieldset{margin-bottom:16px}.choice-list{display:grid;grid-template-columns:repeat(6,1fr);gap:5px}.choice-list label span{display:grid;place-items:center;min-height:36px;border:1px solid #d9dedb;border-radius:7px;font-size:12px;cursor:pointer}.choice-list label:last-child span{font-size:10px}.choice-list input:checked+span{border-color:var(--green);background:var(--mint);color:var(--green);font-weight:700}.custom-number{display:grid;grid-template-columns:auto 80px 1fr;align-items:center;gap:8px;margin-top:9px;font-size:12px;color:var(--muted)}.custom-number[hidden]{display:none}.custom-number input{width:80px;border:1px solid #d6dcd8;border-radius:7px;padding:6px 8px;font:14px inherit}.custom-number input:invalid{border-color:#b94b4b}.layout-summary{margin:4px 0 18px;padding:11px 12px;border-radius:8px;background:#f2f7f4;color:var(--green);font-size:12px;line-height:1.65}.layout-summary.error{background:#fff0ee;color:#a43c32}.primary,.print-button{border:0;border-radius:8px;cursor:pointer;font-weight:700}.primary{width:100%;padding:13px 16px;color:#fff;background:var(--green);font-size:15px;display:flex;justify-content:center;gap:16px}.primary:hover,.print-button:hover{background:var(--green-dark)}.primary:disabled,.print-button:disabled{background:#9aa7a2;cursor:not-allowed}.status{min-height:0;margin:7px 0 0;text-align:center;color:var(--green)}.preview-section{min-width:0}.preview-toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.preview-toolbar>div{display:flex;gap:9px;align-items:center}.preview-toolbar>div>span:last-child{font-size:12px;color:var(--muted);background:#e9e7df;border-radius:20px;padding:2px 8px}.preview-dot{width:8px;height:8px;border-radius:50%;background:var(--green)}.print-button{background:var(--green);color:white;padding:10px 15px}.paper-stack{--preview-scale:1;display:grid;gap:22px;justify-content:center}.paper-preview{width:calc(210mm * var(--preview-scale));height:calc(297mm * var(--preview-scale))}.paper{width:210mm;height:297mm;background:var(--paper);box-shadow:0 15px 50px rgba(32,53,47,.15);padding:12mm;overflow:hidden;transform:scale(var(--preview-scale));transform-origin:top left}.paper-head{height:18mm;display:flex;align-items:start;justify-content:space-between;border-bottom:.3mm solid #d7d7d2;margin-bottom:8mm}.paper-title{font:700 6mm/1 "STKaiti","KaiTi",serif;letter-spacing:.12em}.paper-meta{font-size:2.8mm;color:#777;padding-top:1mm}.practice-rows{height:247mm;display:flex;flex-direction:column;align-items:center}.practice-row{display:flex;flex:0 0 auto;break-inside:avoid;page-break-inside:avoid}.cell{display:block;flex:0 0 auto}.print-tip{text-align:center;font-size:12px;color:var(--muted);margin:12px 0 0}.info{width:min(1100px,calc(100% - 40px));margin:70px auto 40px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.info>div{background:rgba(255,255,255,.55);border-top:2px solid var(--green);padding:24px}.info span{float:left;margin-right:12px;color:var(--green);font:28px "STKaiti","KaiTi",serif}.info h2{font-size:17px;margin:3px 0 12px}.info p{clear:both;color:var(--muted);font-size:14px;margin:0}footer{text-align:center;color:var(--muted);font-size:12px;padding:20px 20px 35px}footer a{color:var(--green)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
/* 页面布局适配：宽屏两栏保持紧凑，中等屏幕提前切换为单栏。 */
@media screen and (min-width:981px){.site-header{max-width:1180px}.hero{padding:32px 20px 30px}.hero h1{font-size:50px}.workspace{width:min(1180px,calc(100% - 48px));grid-template-columns:380px minmax(0,1fr);gap:32px}.panel{padding:20px}.panel textarea{height:112px}.examples{margin-bottom:16px}.panel fieldset{margin-bottom:17px}.mode-list label span{padding:7px 12px}}
@media(max-width:980px){.site-header{max-width:860px}.hero{padding:30px 20px 28px}.workspace{width:min(100% - 32px,860px);display:block}.panel{width:min(100%,680px);margin:0 auto}.preview-section{margin-top:32px}.paper-stack{overflow:hidden}}
@media(max-width:600px){.site-header{height:50px}.hero{padding:26px 18px 24px}.hero h1{font-size:34px}.hero p{font-size:15px}.workspace{width:min(100% - 24px,560px)}.panel{padding:18px}.preview-toolbar{position:sticky;top:0;z-index:5;background:var(--bg);padding:8px 0}.info{grid-template-columns:1fr;margin-top:45px}.print-button{font-size:13px;padding:9px}.preview-toolbar h2{font-size:14px}}
@page{size:A4 portrait;margin:0}@media print{html,body{width:210mm;height:auto;background:white}.no-print{display:none!important}.workspace,.preview-section,.paper-stack{display:block;width:210mm;margin:0;padding:0}.paper-stack{gap:0}.paper-preview{width:210mm;height:297mm;break-after:page;page-break-after:always}.paper-preview:last-child{break-after:auto;page-break-after:auto}.paper{width:210mm;height:297mm;padding:12mm;margin:0;box-shadow:none;transform:none!important}.practice-row{break-inside:avoid;page-break-inside:avoid}}