:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#073779;background:#f3f4f6}*{box-sizing:border-box}body{margin:0}.page{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(180deg,#f9fafb,#eef2ff)}.card{width:100%;max-width:960px;background:#63ddc0;border-radius:20px;padding:32px;box-shadow:0 20px 50px #00000014}h1{margin:0 0 8px;font-size:2.2rem;color:var(--text)}h2{margin:0 0 16px;font-size:1.2rem;color:#136a10}.subtitle{margin:0 0 24px;color:var(--muted)}.panel{margin-top:24px;padding:20px;border:1px solid var(--border);border-radius:16px;background:linear-gradient(180deg,#9ac9fbf2,#3897a7e6)}.panel-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.panel-row .panel{margin-top:24px}.week-box{display:flex;flex-direction:column;align-items:flex-start;gap:4px}.week-label,.week-meta{color:#092c64;font-size:3rem}.week-number{font-size:10rem;font-weight:700;line-height:1;color:#092c64}label{display:block;margin-bottom:8px;font-weight:600;color:var(--text)}input[type=date],input[type=text],select{width:100%;padding:12px 14px;border:1px solid var(--accent);border-radius:12px;font-size:1rem;color:var(--text);background:#42d8aed9}input[type=date]:focus,input[type=text]:focus,input[type=number]:focus{outline:2px solid var(--accent-strong);outline-offset:2px}select:focus{outline:2px solid var(--accent-strong);outline-offset:2px}input[type=number]{width:100%;padding:12px 14px;border:1px solid var(--accent);border-radius:12px;font-size:1rem;color:var(--text);background:#42d8aed9}.input-group{display:grid;gap:12px}button{border:0;border-radius:12px;padding:12px 16px;font-size:1rem;font-weight:700;color:#fff;background:#0f4c81;cursor:pointer}button:hover{background:#0c3d67}button:focus{outline:2px solid var(--accent-strong);outline-offset:2px}.result-box{margin-top:16px;padding:16px;border:1px solid rgba(76,150,222,.35);border-radius:12px;background:#87eee999;color:var(--text)}.error{margin-bottom:16px;padding:12px 14px;border-radius:12px;background:var(--error-bg);color:var(--error-text)}