:root{--brand-dark: #1f2937;--brand-gold: #ffc107;--brand-gold-strong: #e0a800;--bg: #f3f4f6;--surface: #ffffff;--surface-muted: #f9fafb;--border: #e5e7eb;--border-strong: #d1d5db;--text: #111827;--text-muted: #6b7280;--focus: #2563eb;--error: #b91c1c;--error-bg: #fef2f2;--warning-text: #78350f;--warning-bg: #fffbeb;--warning-border: #fcd34d;--success: #166534;--success-bg: #dcfce7;font-family:system-ui,-apple-system,Segoe UI,Helvetica,Arial,sans-serif;line-height:1.5;color:var(--text);background:var(--bg);color-scheme:light;-webkit-font-smoothing:antialiased}@media (prefers-color-scheme: dark){:root{--bg: #0f141b;--surface: #18202b;--surface-muted: #111822;--border: #2a3441;--border-strong: #3a4656;--text: #e5e7eb;--text-muted: #9ca3af;--focus: #60a5fa;--error: #fca5a5;--error-bg: #3b1515;--warning-text: #fde68a;--warning-bg: #2d2410;--warning-border: #8a6d1c;--success: #86efac;--success-bg: #14301f;color-scheme:dark}}*,*:before,*:after{box-sizing:border-box}body{margin:0;min-width:320px;background:var(--bg)}a{color:inherit;text-underline-offset:2px}:focus-visible{outline:2px solid var(--focus);outline-offset:2px}h1,h2{margin:0;line-height:1.2}.app{display:flex;flex-direction:column;min-height:100vh}.app-header{background:var(--brand-dark);color:#fff;border-bottom:3px solid var(--brand-gold)}.app-header-inner,.app-main,.app-footer{width:100%;max-width:1200px;margin:0 auto;padding-inline:16px}.app-header-inner{display:flex;align-items:center;gap:14px;padding-block:16px}.app-logo{flex-shrink:0}.app-header h1{font-size:1.25rem;color:var(--brand-gold)}.app-subtitle{margin:2px 0 0;font-size:.875rem;color:#d1d5db}.app-main{flex:1;padding-block:24px}.layout{display:grid;gap:20px;align-items:start}@media (min-width: 900px){.layout{grid-template-columns:minmax(320px,5fr) 7fr}}.stack{display:grid;gap:20px;min-width:0}.app-footer{padding-block:20px 28px;font-size:.875rem;color:var(--text-muted);text-align:center}.panel{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px;min-width:0}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:16px}.panel-heading h2{font-size:1.05rem}.form{display:grid;gap:16px}.field{display:grid;gap:6px}.field label{font-size:.875rem;font-weight:600}.field input,.field select{width:100%;font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border-strong);border-radius:8px;padding:10px 12px;transition:border-color .15s,box-shadow .15s}.field input::placeholder{color:var(--text-muted);opacity:.8}.field input:focus,.field select:focus{outline:none;border-color:var(--brand-gold-strong);box-shadow:0 0 0 3px #ffc10759}.field input[aria-invalid=true]{border-color:var(--error)}.field-message{margin:0;font-size:.8125rem}.field-error{color:var(--error)}.field-hint{color:var(--text-muted)}.form-footnote{margin:0;font-size:.8125rem;color:var(--text-muted)}.notice{border-radius:8px;padding:12px 14px;font-size:.9rem}.notice p{margin:4px 0 0}.notice-warning{color:var(--warning-text);background:var(--warning-bg);border:1px solid var(--warning-border)}.status{font-size:.75rem;font-weight:600;padding:4px 10px;border-radius:999px;background:var(--surface-muted);color:var(--text-muted);border:1px solid var(--border)}.status-ready{background:var(--success-bg);color:var(--success);border-color:transparent}.status-invalid{background:var(--error-bg);color:var(--error);border-color:transparent}.signature-frame{border:1px dashed var(--border-strong);border-radius:10px;overflow-x:auto}.signature-box{background:#fff;color:#000;padding:16px;border-radius:10px;color-scheme:light}.signature-box a{color:#0563c1}.signature-empty{margin:0;padding:32px 16px;text-align:center;color:var(--text-muted)}.actions{display:grid;gap:10px;margin-top:16px}.actions-secondary{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px}.button{font:inherit;font-weight:600;border-radius:8px;padding:10px 16px;cursor:pointer;color:var(--text);background:var(--surface);border:1px solid var(--border-strong);transition:background-color .15s,border-color .15s}.button:hover:not(:disabled){border-color:var(--brand-gold-strong)}.button:disabled{cursor:not-allowed;opacity:.5}.button-primary{color:var(--brand-gold);background:var(--brand-dark);border-color:var(--brand-dark);padding-block:12px}.button-primary:hover:not(:disabled){background:#111827;border-color:var(--brand-gold)}.link-button{font:inherit;font-size:.875rem;color:var(--text-muted);background:none;border:none;padding:0;cursor:pointer;text-decoration:underline;text-underline-offset:2px}.link-button:hover{color:var(--text)}.tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}.tab{font:inherit;font-size:.875rem;padding:6px 12px;border-radius:999px;cursor:pointer;color:var(--text-muted);background:var(--surface-muted);border:1px solid var(--border)}.tab[aria-selected=true]{color:var(--brand-dark);background:var(--brand-gold);border-color:var(--brand-gold);font-weight:600}.steps{margin:0;padding-left:1.25rem;display:grid;gap:6px;font-size:.925rem}.guide-note{margin:12px 0 0;font-size:.85rem;color:var(--text-muted)}kbd,code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.85em;background:var(--surface-muted);border:1px solid var(--border);border-radius:4px;padding:0 4px;overflow-wrap:anywhere}.toast-region{position:fixed;left:50%;bottom:24px;transform:translate(-50%);width:max-content;max-width:calc(100vw - 32px);z-index:10}.toast{padding:12px 18px;border-radius:10px;font-weight:600;font-size:.9rem;box-shadow:0 10px 25px #0003;animation:toast-in .2s ease-out}.toast-success{color:var(--brand-gold);background:var(--brand-dark)}.toast-error{color:#fff;background:#b91c1c}@keyframes toast-in{0%{opacity:0;transform:translateY(8px)}}@media (prefers-reduced-motion: reduce){.toast{animation:none}}