:root {
    --ink: #1a2d5c;
    --ink-soft: #2d3f6b;
    --bg: #ffffff;
    --bg-elevated: #f5f7fb;
    --border: #d8dde8;
    --border-strong: #b8c0d0;
    --text: #1a2d5c;
    --text-muted: #5a6584;
    --accent: #c84d2a;
    --accent-hover: #a83d1f;
    --accent-soft: #fbe7df;
    --flag: #8b2e2e;
    --flag-soft: #f4e4e0;
    --success: #2d6b4f;
    --tester: #8a6d3b;
    --tester-soft: #fbf3dc;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html, body { background: var(--bg); color: var(--text); font-family: 'IBM Plex Sans', system-ui, sans-serif; font-size: 16px; line-height: 1.55; -webkit-font-smoothing: antialiased; }
  body { min-height: 100vh; padding: 40px 20px 60px; background: var(--bg-elevated); }
  .shell { max-width: 680px; margin: 0 auto; background: var(--bg); padding: 40px 36px 48px; border: 1px solid var(--border); box-shadow: 0 2px 12px rgba(26, 45, 92, 0.04); }
  header {
    background: var(--ink);
    padding: 24px 36px;
    margin: -40px -36px 32px -36px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
    border-bottom: 4px solid var(--accent);
  }
  .logo-card {
    background: white;
    padding: 14px 22px;
    border-radius: 2px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  }
  .brand-logo { display: block; height: 60px; width: auto; max-width: 100%; }
  .header-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
  }
  .brand-tagline {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: #b8c0d0;
    text-align: right;
  }
  .meta {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.12em;
    color: #b8c0d0;
    text-align: right;
  }
  .meta .label { text-transform: uppercase; letter-spacing: 0.15em; color: #8a95a8; }
  .meta .value { color: white; margin-top: 2px; font-weight: 500; }
  .header-accent { display: none; }
  .progress-wrap { margin-bottom: 28px; }
  .progress-label { display: flex; justify-content: space-between; font-family: 'IBM Plex Mono', monospace; font-size: 10px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 8px; }
  .progress-bar { height: 3px; background: var(--border); position: relative; overflow: hidden; border-radius: 1px; }
  .progress-fill { position: absolute; top: 0; left: 0; height: 100%; background: var(--accent); transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1); }
  .step { animation: fadeIn 0.35s ease-out; }
  @keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
  .step-eyebrow { font-family: 'IBM Plex Mono', monospace; font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
  .step-title { font-family: 'IBM Plex Sans', sans-serif; font-weight: 500; font-size: 30px; line-height: 1.15; letter-spacing: -0.015em; color: var(--ink); margin-bottom: 14px; }
  .step-desc { color: var(--text-muted); font-size: 15px; margin-bottom: 28px; max-width: 560px; }
  .field { margin-bottom: 20px; }
  .field-label { display: block; font-weight: 500; font-size: 14px; color: var(--ink); margin-bottom: 6px; }
  .field-label .opt { font-weight: 400; font-size: 12px; color: var(--text-muted); margin-left: 6px; }
  .field-label .req { color: var(--accent); font-weight: 600; margin-left: 3px; }
  .privilege-notice { background: #f5efe3; border-left: 2px solid #8a6d3b; padding: 10px 14px; margin-bottom: 10px; font-size: 12px; color: #6b5220; line-height: 1.55; border-radius: 2px; }
  .privilege-notice::before { content: "⚠ Privacy reminder"; display: block; font-family: 'IBM Plex Mono', monospace; font-size: 9px; letter-spacing: 0.2em; color: #8a6d3b; margin-bottom: 4px; font-weight: 500; text-transform: uppercase; }
  .char-min-note { font-family: 'IBM Plex Mono', monospace; font-size: 10px; color: var(--text-muted); margin-top: 4px; letter-spacing: 0.05em; }
  input[type="text"], input[type="email"], input[type="tel"], input[type="number"], input[type="date"], textarea { width: 100%; background: var(--bg-elevated); border: 1px solid var(--border-strong); border-radius: 2px; padding: 11px 13px; font-family: inherit; font-size: 14.5px; color: var(--ink); transition: border-color 0.15s, box-shadow 0.15s; }
  input:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
  textarea { resize: vertical; min-height: 100px; font-family: inherit; line-height: 1.55; }
  .char-counter { font-family: 'IBM Plex Mono', monospace; font-size: 11px; color: var(--text-muted); text-align: right; margin-top: 6px; letter-spacing: 0.05em; }
  .char-counter.warn { color: var(--accent); }
  .char-counter.over { color: var(--flag); }
  .option-list { display: flex; flex-direction: column; gap: 10px; }
  .option { display: flex; align-items: center; gap: 14px; padding: 14px 16px; background: var(--bg-elevated); border: 1px solid var(--border-strong); border-radius: 2px; cursor: pointer; transition: border-color 0.15s, background 0.15s; }
  .option:hover { border-color: var(--ink-soft); }
  .option input[type="radio"], .option input[type="checkbox"] { appearance: none; width: 16px; height: 16px; border: 1.5px solid var(--border-strong); border-radius: 50%; flex-shrink: 0; position: relative; cursor: pointer; background: var(--bg); }
  .option input[type="checkbox"] { border-radius: 2px; }
  .option input[type="radio"]:checked, .option input[type="checkbox"]:checked { border-color: var(--accent); background: var(--accent); }
  .option input[type="radio"]:checked::after { content: ''; position: absolute; top: 3px; left: 3px; width: 7px; height: 7px; border-radius: 50%; background: var(--bg); }
  .option input[type="checkbox"]:checked::after { content: ''; position: absolute; top: 1px; left: 4px; width: 4px; height: 8px; border: solid var(--bg); border-width: 0 2px 2px 0; transform: rotate(45deg); }
  .option:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
  .option-content { flex: 1; }
  .option-label { font-size: 15px; color: var(--ink); }
  .option-sub { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
  .sub-input { margin-top: 14px; padding-left: 18px; border-left: 2px solid var(--accent-soft); }
  .inline-group { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
  @media (max-width: 500px) { .inline-group { grid-template-columns: 1fr; } }
  .nav { margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; gap: 12px; }
  button { font-family: inherit; font-size: 14px; font-weight: 500; padding: 12px 24px; border: none; cursor: pointer; letter-spacing: 0.02em; transition: background 0.15s, color 0.15s, border-color 0.15s; }
  .btn-primary { background: var(--ink); color: var(--bg); border-radius: 2px; }
  .btn-primary:hover:not(:disabled) { background: var(--accent); }
  .btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }
  .btn-secondary { background: transparent; color: var(--text-muted); padding: 12px 8px; font-size: 13px; }
  .btn-secondary:hover { color: var(--ink); }
  .btn-add { background: transparent; color: var(--accent); border: 1px dashed var(--accent); padding: 8px 14px; font-size: 13px; margin-top: 8px; }
  .btn-add:hover { background: var(--accent-soft); }
  .btn-remove { background: transparent; color: var(--text-muted); padding: 6px 10px; font-size: 12px; font-family: 'IBM Plex Mono', monospace; }
  .btn-remove:hover { color: var(--flag); }
  .date-row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
  .date-row input { flex: 1; }
  .notice { background: var(--bg-elevated); border: 1px solid var(--border-strong); border-left: 3px solid var(--accent); padding: 18px 22px; margin-bottom: 20px; }
  .notice-title { font-family: 'IBM Plex Sans', sans-serif; font-weight: 500; font-size: 17px; color: var(--ink); margin-bottom: 8px; }
  .notice p { font-size: 14px; color: var(--ink-soft); line-height: 1.6; }
  .notice p + p { margin-top: 8px; }
  .admin-toggle { margin-top: 32px; padding: 20px; background: var(--ink); color: var(--bg); border-radius: 2px; }
  .admin-toggle-header { display: flex; justify-content: space-between; align-items: center; cursor: pointer; }
  .admin-toggle-title { font-family: 'IBM Plex Mono', monospace; font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--accent-soft); }
  .admin-toggle-chev { font-size: 18px; transition: transform 0.2s; }
  .admin-toggle.open .admin-toggle-chev { transform: rotate(180deg); }
  .admin-content { display: none; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--ink-soft); font-family: 'IBM Plex Mono', monospace; font-size: 12px; line-height: 1.7; }
  .admin-toggle.open .admin-content { display: block; }
  .admin-section { margin-bottom: 20px; }
  .admin-section-title { color: var(--accent-soft); font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; margin-bottom: 8px; }
  .admin-row { color: #d4cdc0; }
  .admin-row strong { color: var(--bg); font-weight: 500; }
  .admin-row + .admin-row { margin-top: 2px; }
  .flag-block { background: rgba(139, 46, 46, 0.2); border-left: 2px solid #d4918d; padding: 12px 14px; margin-bottom: 6px; font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: #f4e4e0; }
  .flag-block strong { color: #ffc9c2; display: block; margin-bottom: 2px; font-size: 10px; letter-spacing: 0.15em; text-transform: uppercase; }
  .no-flags { color: var(--success); font-family: 'IBM Plex Mono', monospace; font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; }
  .success-mark { width: 48px; height: 48px; border: 1px solid var(--success); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-bottom: 24px; color: var(--success); font-family: 'IBM Plex Sans', sans-serif; font-size: 24px; }
  .review-summary { background: var(--bg-elevated); border: 1px solid var(--border); padding: 22px; margin-bottom: 20px; }
  .review-row { display: grid; grid-template-columns: 180px 1fr; gap: 20px; padding: 8px 0; border-bottom: 1px dashed var(--border); font-size: 13.5px; }
  .review-row:last-child { border-bottom: none; }
  .review-key { font-family: 'IBM Plex Mono', monospace; font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); }
  .review-val { color: var(--ink); }
  @media (max-width: 560px) { .review-row { grid-template-columns: 1fr; gap: 2px; } .step-title { font-size: 24px; } }
  .proto-banner {
    background: var(--tester-soft);
    color: var(--tester);
    padding: 8px 16px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 0;
    border: 1px dashed var(--tester);
    border-radius: 2px;
  }
  .proto-banner span { color: var(--accent); font-weight: 600; }
  .engagement-letter-header {
    background: var(--ink);
    color: white;
    padding: 14px 20px;
    margin-bottom: 0;
    font-family: 'IBM Plex Sans', sans-serif;
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
  }
  .engagement-letter-header .sublabel {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.15em;
    color: #b8c0d0;
    font-weight: 400;
    text-transform: uppercase;
  }
  .engagement-letter {
    border: 1px solid var(--border-strong);
    background: var(--bg);
    padding: 24px 28px;
    margin-bottom: 16px;
    max-height: 380px;
    overflow-y: auto;
    font-size: 13.5px;
    line-height: 1.65;
    color: var(--ink);
  }
  .engagement-letter::-webkit-scrollbar { width: 8px; }
  .engagement-letter::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }
  .engagement-letter h3 {
    font-family: 'IBM Plex Sans', sans-serif;
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-top: 16px;
    margin-bottom: 8px;
  }
  .engagement-letter h3:first-child { margin-top: 0; }
  .engagement-letter p { margin-bottom: 10px; }
  .engagement-letter .compensation-option { display: flex; gap: 10px; margin-bottom: 10px; padding-left: 4px; }
  .engagement-letter .compensation-option .check { color: var(--text-muted); font-family: 'IBM Plex Mono', monospace; flex-shrink: 0; margin-top: 1px; }
  .engagement-letter .signature-block { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--border); font-size: 12.5px; color: var(--text-muted); }
  .engagement-letter em { color: var(--ink-soft); font-style: italic; }
  .subcontract-notice { 
    background: #fef0eb; border-left: 3px solid var(--accent); 
    padding: 16px 20px; margin-bottom: 20px; border-radius: 2px; 
  }
  .subcontract-notice .notice-title { 
    font-weight: 600; margin-bottom: 8px; color: var(--ink); 
  }
  .subcontract-notice p { 
    margin-bottom: 8px; font-size: 13.5px; 
  }
  .subcontract-notice strong { 
    color: var(--accent); font-weight: 600; 
  }
  .engagement-pdf {
    width: 100%;
    height: 520px;
    border: 1px solid var(--border-strong);
    border-top: none;
    display: block;
    background: var(--bg-elevated);
  }
  .engagement-actions {
    display: flex;
    gap: 12px;
    margin-top: 14px;
    flex-wrap: wrap;
  }
  .btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--ink);
    color: white;
    text-decoration: none;
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.02em;
    border-radius: 2px;
    border: 1px solid var(--ink);
    transition: background 0.15s;
  }
  .btn-download:hover { background: var(--ink-soft); }
  .btn-download.secondary { background: white; color: var(--ink); border-color: var(--border-strong); }
  .btn-download.secondary:hover { border-color: var(--ink); }
  .btn-download::before { content: "⇩"; font-size: 14px; }
  .referral-card { background: var(--bg-elevated); border: 1px solid var(--border-strong); border-left: 3px solid var(--ink); padding: 16px 18px; margin-bottom: 10px; }
  .referral-card .name { font-family: 'IBM Plex Sans', sans-serif; font-size: 16px; color: var(--ink); margin-bottom: 4px; }
  .referral-card .detail { font-size: 13px; color: var(--text-muted); }