:root{--c-bg: #f4f7fb;--c-surface: #ffffff;--c-border: #e2e8f0;--c-text: #0f172a;--c-muted: #64748b;--c-primary: #0e7490;--c-primary-dark: #155e75;--c-primary-soft: #ecfeff;--c-danger: #dc2626;--c-success: #16a34a;--radius: 12px;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);--shadow-md: 0 8px 24px rgba(15, 23, 42, .08)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,"Apple Color Emoji","Segoe UI Emoji";background:var(--c-bg);color:var(--c-text);-webkit-font-smoothing:antialiased}.app-shell{min-height:100%;display:flex;flex-direction:column}.app-header{background:var(--c-surface);border-bottom:1px solid var(--c-border);padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;position:sticky;top:0;z-index:10;box-shadow:var(--shadow-sm)}.brand{display:flex;align-items:center;gap:10px;font-weight:700}.brand-mark{width:32px;height:32px;border-radius:8px;background:var(--c-primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;line-height:1}.brand-name{font-size:16px}.app-nav{display:flex;gap:4px;background:var(--c-bg);padding:4px;border-radius:999px}.app-nav a{text-decoration:none;color:var(--c-muted);padding:8px 14px;font-size:14px;font-weight:600;border-radius:999px;transition:background .15s,color .15s}.app-nav a.active{background:var(--c-primary);color:#fff}.app-main{flex:1;padding:20px 16px 40px;display:flex;justify-content:center}.app-footer{padding:16px;text-align:center;font-size:12px;color:var(--c-muted)}.page{width:100%;max-width:820px}.card{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm)}.card+.card{margin-top:16px}.card-title{margin:0 0 4px;font-size:20px;font-weight:700}.card-subtitle{margin:0 0 16px;color:var(--c-muted);font-size:14px}.section-title{margin:16px 0 10px;font-size:14px;font-weight:700;color:var(--c-primary-dark);text-transform:uppercase;letter-spacing:.05em}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 16px}.field{display:flex;flex-direction:column;gap:6px}.field.full{grid-column:1 / -1}.field label{font-size:13px;font-weight:600;color:#334155}.field label .req{color:var(--c-danger);margin-left:2px}.field input,.field select,.field textarea{width:100%;font:inherit;padding:10px 12px;border:1px solid var(--c-border);border-radius:8px;background:#fff;color:var(--c-text);transition:border-color .15s,box-shadow .15s}.field textarea{min-height:80px;resize:vertical}.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--c-primary);box-shadow:0 0 0 3px #0e74902e}.actions{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid transparent;padding:11px 18px;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:background .15s,color .15s,transform .05s}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--c-primary);color:#fff}.btn-primary:hover{background:var(--c-primary-dark)}.btn-primary:disabled{background:#94a3b8;cursor:not-allowed}.btn-ghost{background:transparent;color:var(--c-primary);border-color:var(--c-border)}.btn-ghost:hover{background:var(--c-primary-soft)}.letter-heading{text-align:center;margin:0 0 12px;line-height:1.4;font-size:13px}.letter-heading em{display:inline-block;border-bottom:1px solid var(--c-text);padding:0 8px;font-style:italic}.commit-text{font-style:italic;color:#334155;background:#fafcff;border-left:3px solid var(--c-primary);padding:10px 12px;margin:16px 0 8px;border-radius:0 8px 8px 0;font-size:14px}.radio-group,.check-group{display:flex;flex-direction:column;gap:8px;margin-top:4px}.radio,.check{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--c-border);border-radius:10px;background:#fff;cursor:pointer;font-size:14px;transition:border-color .15s,background .15s;-webkit-user-select:none;user-select:none}.radio:hover,.check:hover{border-color:var(--c-primary);background:var(--c-primary-soft)}.radio input[type=radio],.check input[type=checkbox]{width:18px;height:18px;accent-color:var(--c-primary);cursor:pointer;flex:0 0 auto}.radio input:checked+span,.check input:checked+span{color:var(--c-primary-dark);font-weight:600}@media (min-width: 641px){.radio-group{flex-direction:row}.radio{flex:1}}.alert{border-radius:10px;padding:12px 14px;font-size:14px;margin-bottom:12px;border:1px solid transparent}.alert.error{background:#fef2f2;color:#991b1b;border-color:#fecaca}.alert.success{background:#f0fdf4;color:#166534;border-color:#bbf7d0}.alert.info{background:var(--c-primary-soft);color:var(--c-primary-dark);border-color:#a5f3fc}.status-box{display:flex;align-items:center;gap:12px;padding:14px;border:1px dashed var(--c-border);border-radius:10px;background:#fafcff}.spinner{width:18px;height:18px;border-radius:50%;border:3px solid #cbd5e1;border-top-color:var(--c-primary);animation:spin .8s linear infinite;flex:0 0 auto}@keyframes spin{to{transform:rotate(360deg)}}.qr-wrap{display:flex;flex-direction:column;align-items:center;gap:14px;padding:12px}.qr-frame{padding:16px;background:#fff;border:1px solid var(--c-border);border-radius:var(--radius)}.qr-target{word-break:break-all;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;background:#f1f5f9;padding:8px 10px;border-radius:6px;text-align:center;max-width:100%}@media (max-width: 640px){.app-header{flex-wrap:wrap}.brand-name{font-size:15px}.app-nav a{padding:7px 12px;font-size:13px}.app-main{padding:14px 12px 28px}.card{padding:16px;border-radius:14px}.card-title{font-size:18px}.form-grid{grid-template-columns:1fr;gap:10px}.btn{width:100%}.actions .btn{flex:1 1 100%}}