:root{font-family:Inter,Noto Sans JP,system-ui,sans-serif;line-height:1.5;font-weight:400;color:#1f2933;background-color:#f4f5f7}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}.app-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:radial-gradient(circle at top,#fff,#f4f5f7 60%)}.card{width:min(420px,100%);background:#fff;border:1px solid #e1e5ea;border-radius:16px;padding:24px;box-shadow:0 12px 32px #0f172a14;display:flex;flex-direction:column;gap:16px}.card-title{margin:0;font-size:20px}.field{display:flex;flex-direction:column;gap:8px;font-size:14px}.field input{border-radius:10px;border:1px solid #d7dce1;padding:10px 12px}.button-row{display:flex;flex-direction:column;gap:10px}button{border:none;border-radius:10px;padding:10px 12px;cursor:pointer;font-weight:600}button:disabled{opacity:.6;cursor:not-allowed}.primary{background:#2563eb;color:#fff}.secondary{background:#0f766e;color:#fff}.outline{background:#fff;color:#1f2933;border:1px solid #d7dce1}.hint{margin:0;font-size:12px;color:#64748b}.error{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;padding:10px 12px;border-radius:10px;font-size:13px}.session-info{display:flex;flex-direction:column;gap:4px;font-size:15px}.session-sub{color:#64748b;font-size:13px}