:root{color-scheme:light;--bg:#f6f8fb;--surface:#fff;--line:#cbd5e1;--text:#172033;--muted:#5b6678;--blue:#1f6feb;--blue-dark:#174ea6;font-family:"Yu Gothic UI",Meiryo,system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-size:16px;line-height:1.65}.shell{width:min(1080px,calc(100% - 48px));margin:36px auto 24px}header{padding:0 0 23px;border-bottom:1px solid var(--line)}.eyebrow{font-size:13px;font-weight:700;letter-spacing:.05em;color:var(--blue-dark);margin:0 0 10px}.eyebrow span{color:#94a3b8;padding:0 9px}h1{font-size:30px;line-height:1.4;margin:0 0 10px}h2{font-size:23px;margin:0 0 24px}h3{font-size:14px;margin:0 0 7px}.intro{margin:0;color:var(--muted)}.workspace{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:28px}.panel{padding:28px;background:var(--surface);border:1px solid var(--line);border-radius:14px}.step{color:var(--blue-dark);font-size:13px;font-weight:700;margin:0 0 8px}.year-row{display:flex;align-items:center;justify-content:space-between;gap:16px}.year-row label{font-weight:700}.year-row>div{display:flex;gap:10px;align-items:center}#year{font:inherit;width:112px;border:1px solid #94a3b8;padding:9px 12px;border-radius:7px}.field-help{font-size:12px;color:var(--muted);margin:8px 0 0}.drop-zone{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;margin-top:22px;padding:24px 12px;border:2px dashed #94a3b8;border-radius:10px;cursor:pointer;background:#fafbfe;min-height:168px}.drop-zone:hover,.drop-zone.dragging{border-color:var(--blue);background:#edf4ff}.drop-zone:focus-within{outline:3px solid #a7c7fc;outline-offset:3px}.drop-zone input{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}.file-mark{padding:3px 8px;border:1px solid #9cb7dd;border-radius:4px;font-size:11px;font-weight:700;color:var(--blue-dark);letter-spacing:.05em}.file-description{font-size:12px;color:var(--muted)}.file-name{font-size:13px;margin:12px 0 0;overflow-wrap:anywhere;font-weight:600}.button{display:flex;align-items:center;justify-content:center;gap:18px;width:100%;padding:13px 16px;font:inherit;font-weight:700;text-decoration:none;border:1px solid transparent;border-radius:8px;cursor:pointer;min-height:50px}.primary{background:var(--blue);color:#fff;margin-top:24px}.primary:hover{background:var(--blue-dark)}.primary:disabled{opacity:.65;cursor:wait}.button:focus-visible,.reset:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #93baf7;outline-offset:3px}.storage{font-size:12px;line-height:1.7;color:var(--muted);margin:16px 0 0}.result-panel{display:flex;flex-direction:column}.empty-state{display:flex;flex:1;min-height:254px;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:20px 0}.empty-state p{font-size:13px;color:var(--muted);margin:10px 0}.empty-symbol{display:block;color:#9aa9bf;font-size:42px;font-weight:300;margin-bottom:12px}.output-note{margin-top:24px;padding-top:18px;border-top:1px solid #e2e8f0}.output-note p{font-size:13px;color:var(--muted);margin:0}.alert{padding:15px 16px;border-radius:8px;font-size:14px;overflow-wrap:anywhere}.alert p{margin:6px 0 0;font-size:12px}.error{background:#fff0f0;border:1px solid #e9b7b7;color:#9c2020}.success{background:#eef8f2;border:1px solid #bddcc9;color:#256144}.warning{background:#fff8e8;border:1px solid #ead7a5;color:#795810;font-size:12px}.warning ul{padding-left:20px;margin:8px 0 0}.metrics{display:grid;grid-template-columns:1fr 1fr;margin:18px 0;gap:14px}.metrics>div{padding:0 0 12px;border-bottom:1px solid #e2e8f0}.metrics .wide{grid-column:1/-1}.metrics dt{font-size:12px;color:var(--muted)}.metrics dd{font-size:24px;line-height:1.4;font-weight:700;font-variant-numeric:tabular-nums;margin:6px 0 0}.reset{font:inherit;font-size:13px;display:block;margin:16px auto 0;color:var(--blue-dark);background:none;border:0;text-decoration:underline;cursor:pointer;min-height:36px}.rules{margin-top:24px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:13px}.rules summary{padding:15px 20px;cursor:pointer;font-weight:600}.rules>div{padding:0 20px 10px;color:var(--muted)}footer{font-size:12px;color:var(--muted);margin-top:18px}.spinner{width:28px;height:28px;border:3px solid #c8daf7;border-top-color:var(--blue);border-radius:50%;animation:rotate 1s linear infinite;margin-bottom:20px}@keyframes rotate{to{transform:rotate(360deg)}}[hidden]{display:none!important}@media(max-width:720px){.shell{width:calc(100% - 32px);margin-top:22px}h1{font-size:25px}.intro{font-size:14px}.workspace{grid-template-columns:1fr;gap:18px;margin-top:20px}.panel{padding:22px}.empty-state{min-height:180px}.metrics dd{font-size:23px}}@media(prefers-reduced-motion:reduce){.spinner{animation:none}}