*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:#f6f4fc;color:#1f1b2d;padding-bottom:76px}
.topbar{background:linear-gradient(135deg,#7c3aed,#5b21b6);color:#fff;padding:18px 16px 22px}
.topbar-in{max-width:640px;margin:0 auto}
.brand{font-size:20px;font-weight:800}
.sub{font-size:13px;opacity:.85;margin-top:4px}
.langsel{margin-top:10px;background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.45);border-radius:8px;padding:7px 10px;font-size:13px;cursor:pointer}
.langsel option{color:#1f1b2d}
.page{max-width:640px;margin:-12px auto 0;padding:0 12px}
.card{background:#fff;border-radius:14px;padding:16px;margin:12px 0;box-shadow:0 2px 10px rgba(124,58,237,.07)}
.section-title{font-size:16px;font-weight:800;margin-bottom:8px}
.hint{font-size:13px;color:#6b6480;line-height:1.6}
.btn{display:inline-block;background:#7c3aed;color:#fff;border:none;border-radius:10px;padding:12px 20px;font-size:15px;font-weight:700;cursor:pointer;text-decoration:none;text-align:center}
.btn.ghost{background:#f1ebfd;color:#7c3aed}
.btn.sm{padding:8px 14px;font-size:13px}
.btn-row{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.field{margin:10px 0}
.field label{display:block;font-size:14px;font-weight:700;margin-bottom:6px}
.field input,.field select,.field textarea{width:100%;border:1.5px solid #e2dcf5;border-radius:10px;padding:11px;font-size:15px;background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:#7c3aed}
.radio-card{display:flex;gap:10px;align-items:flex-start;border:2px solid #e9e2f7;border-radius:12px;padding:14px;margin:8px 0;cursor:pointer;font-size:15px}
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.radio-card input{width:20px;height:20px;accent-color:#7c3aed;flex:none;margin-top:2px}
.alert{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:12px;font-size:14px;line-height:1.7;margin:12px 0}
.verdict{border-radius:10px;padding:12px;font-size:15px;font-weight:700;margin:12px 0}
.verdict.ok{background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46}
.qblock{background:#faf8ff;border:1px solid #e9e2f7;border-radius:12px;padding:12px;margin:10px 0}
.qblock h4{font-size:15px;margin-bottom:8px;color:#5b21b6}
.course-row{display:flex;justify-content:space-between;align-items:center;padding:9px 0;border-bottom:1px solid #f0ebfa;font-size:14px}
.course-row:last-child{border:none}
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.warn{background:#fef2f2;border:1px solid #fecaca;border-radius:10px;padding:10px;font-size:13px;color:#991b1b;margin:8px 0}
.tip{background:#f5f0ff;border-left:4px solid #7c3aed;padding:10px 12px;font-size:14px;margin:8px 0;border-radius:0 8px 8px 0}
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.tabbar a.active{color:#7c3aed;font-weight:700}
.tabbar .ico{display:block;font-size:19px;margin-bottom:2px}
.footnote{font-size:12px;color:#9a94b0;margin-top:10px;line-height:1.6}
pre.code{background:#1f1b2d;color:#d8d3ea;border-radius:10px;padding:12px;font-size:12px;overflow-x:auto;margin:8px 0}
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.course-row.check span{flex:1}
.link{font-size:13px;color:#7c3aed;text-decoration:none}
.selbar{position:fixed;left:0;right:0;bottom:76px;display:flex;justify-content:space-between;align-items:center;background:#fff;border-top:1px solid #ece7f7;padding:10px 16px;z-index:90;box-shadow:0 -2px 12px rgba(0,0,0,.06);font-size:14px}
body.has-selbar{padding-bottom:140px}
.checkwrap{display:flex;align-items:center;gap:8px;cursor:pointer;flex:1;min-width:0}
.checkwrap input{width:18px;height:18px;accent-color:#7c3aed;flex:none}
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.ebadge.cc{background:#dcfce7;color:#15803d}
.course-row.had{opacity:.55}
.tag.have{background:#fef3c7;color:#92400e}
[data-havebtn].on{background:#ede9fe;color:#5b21b6}
.pop{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:200;display:flex;align-items:center;justify-content:center;padding:20px}
.pop[hidden]{display:none!important}
.pop-card{background:#fff;border-radius:14px;max-width:520px;width:100%;max-height:80vh;overflow:auto;padding:18px}
.eqrow{font-size:14px;padding:7px 0;border-bottom:1px solid #f0ebfa}
.eqrow:last-child{border:none}
.tline-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center;font-size:14px}
.tline-row .numin{width:56px;padding:8px;border:1px solid #ddd6f3;border-radius:8px;font-size:14px}
.tline-row .checkwrap{flex:none}
.tverdict{font-size:16px;font-weight:700;margin:6px 0}
.tverdict.feasible{color:#15803d}.tverdict.tight{color:#b45309}.tverdict.infeasible{color:#dc2626}
.tstat{font-size:14px;padding:4px 0}
.seg{display:flex;gap:8px;margin:0 0 12px}
.seg button{flex:1;padding:10px;border:1px solid #ddd6f3;background:#fff;border-radius:10px;font-size:14px;color:#5b21b6}
.seg button.on{background:#7c3aed;color:#fff;border-color:#7c3aed;font-weight:700}
.trajrow{padding:9px 0;border-bottom:1px solid #f0ebfa;font-size:14px}
.trajrow:last-child{border:none}
.why{margin-top:4px}
.wtag{display:inline-block;font-size:12px;background:#f5f3ff;color:#6d28d9;border-radius:6px;padding:2px 8px;margin:2px 4px 2px 0}
.optgroup{margin:8px 0;padding:8px;background:#faf9ff;border-radius:8px}
.opthead{margin-bottom:4px;font-size:13px}
.chatbtn{position:fixed;right:16px;bottom:76px;z-index:300;width:52px;height:52px;border-radius:50%;border:none;background:#7c3aed;color:#fff;font-size:24px;cursor:pointer;box-shadow:0 4px 14px rgba(124,58,237,.4)}
.chatpanel{position:fixed;right:16px;bottom:140px;z-index:300;width:min(340px,calc(100vw - 32px));height:420px;background:#fff;border-radius:14px;box-shadow:0 8px 30px rgba(0,0,0,.2);display:flex;flex-direction:column;overflow:hidden}
.chatpanel[hidden]{display:none!important}
.chathead{display:flex;justify-content:space-between;align-items:center;padding:12px 14px;background:#7c3aed;color:#fff;font-size:15px}
.chatx{background:none;border:none;color:#fff;font-size:16px;cursor:pointer}
.chatbody{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px}
.chatmsg{max-width:85%;padding:8px 12px;border-radius:12px;font-size:14px;line-height:1.5}
.chatmsg.bot{background:#f5f3ff;color:#333;align-self:flex-start}
.chatmsg.me{background:#7c3aed;color:#fff;align-self:flex-end}
.chatinput{display:flex;gap:8px;padding:10px;border-top:1px solid #eee}
.chatinput input{flex:1;padding:9px 12px;border:1px solid #ddd6f3;border-radius:20px;font-size:14px}
.chatinput button{border:none;background:#7c3aed;color:#fff;width:38px;height:38px;border-radius:50%;cursor:pointer;font-size:16px}
.dchips{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.dchip{padding:8px 12px;border:1px solid #ddd6f3;background:#fff;border-radius:20px;font-size:14px;cursor:pointer;color:#333}
.dchip.sel{background:#7c3aed;color:#fff;border-color:#7c3aed}
.dchip.bad{border-color:#f59e0b;background:#fffbeb}
.tag.ov{background:#fef3c7;color:#92400e;font-weight:700}
.chk{display:flex;gap:10px;align-items:flex-start;padding:9px 4px;border-bottom:1px solid #f1ecfb;font-size:14px;cursor:pointer}
.chk input{margin-top:3px;accent-color:#7c3aed}