@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500&family=DM+Mono:wght@400;500&display=swap');

  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  :root {
    --bg:       #f7f6f3;
    --surface:  #ffffff;
    --border:   #e8e6e1;
    --text:     #1a1916;
    --muted:    #8a8880;
    --accent:   #2d6a4f;
    --accent-l: #e8f4ee;
    --danger:   #c0392b;
    --danger-l: #fdf0ee;
    --radius:   10px;
  }

  body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg); color: var(--text);
    min-height: 100vh; font-size: 14px;
    display: flex; flex-direction: column; align-items: center;
    padding: 40px 16px 60px;
  }

  .logo {
    font-size: 13px; font-weight: 500; letter-spacing: .06em;
    text-transform: uppercase; color: var(--muted);
    margin-bottom: 32px;
  }

  .card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 14px;
    width: 100%; max-width: 460px;
    box-shadow: 0 2px 8px rgba(0,0,0,.06);
    overflow: hidden;
  }

  /* Stepper */
  .stepper {
    display: grid; grid-template-columns: 1fr 1fr;
    border-bottom: 1px solid var(--border);
  }

  .step {
    padding: 16px 20px; display: flex; align-items: center; gap: 10px;
    font-size: 13px; color: var(--muted);
    border-bottom: 2px solid transparent;
    transition: all .2s;
  }

  .step.active { color: var(--accent); border-bottom-color: var(--accent); }
  .step.done   { color: var(--accent); }

  .step-num {
    width: 22px; height: 22px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 11px; font-weight: 500;
    background: var(--border); color: var(--muted);
    flex-shrink: 0; transition: all .2s;
  }

  .step.active .step-num { background: var(--accent); color: #fff; }
  .step.done   .step-num { background: var(--accent-l); color: var(--accent); }
  .step.done   .step-num::after { content: '✓'; }

  /* Paneles */
  .panel { padding: 28px; display: none; }
  .panel.visible { display: block; }

  .panel-title { font-size: 17px; font-weight: 500; margin-bottom: 4px; }
  .panel-sub   { font-size: 13px; color: var(--muted); margin-bottom: 24px; }

  /* Fields */
  .field { margin-bottom: 16px; }

  .field label {
    display: block; font-size: 11px; font-weight: 500;
    text-transform: uppercase; letter-spacing: .05em;
    color: var(--muted); margin-bottom: 6px;
  }

  .field label .opt {
    font-weight: 400; text-transform: none; letter-spacing: 0;
    color: var(--muted); font-size: 11px; margin-left: 4px;
  }

  input[type="text"], input[type="email"],
  input[type="password"], input[type="tel"], select {
    width: 100%; padding: 10px 12px;
    border: 1px solid var(--border); border-radius: 8px;
    font-family: 'DM Sans', sans-serif; font-size: 14px;
    color: var(--text); background: var(--bg);
    outline: none; transition: border-color .15s, box-shadow .15s;
    appearance: none;
  }

  input:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(45,106,79,.1);
  }

  input.error { border-color: var(--danger); }

  .field-error {
    font-size: 12px; color: var(--danger);
    margin-top: 4px; display: none;
  }
  .field-error.visible { display: block; }

  .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

  /* Sección fiscal opcional */
  .opcional-toggle {
    display: flex; align-items: center; gap: 8px;
    padding: 12px 0; cursor: pointer;
    font-size: 13px; color: var(--muted);
    border-top: 1px solid var(--border);
    margin: 8px 0 0; user-select: none;
  }

  .opcional-toggle:hover { color: var(--text); }

  .opcional-toggle .arrow {
    width: 16px; height: 16px;
    border: 1px solid var(--border); border-radius: 4px;
    display: flex; align-items: center; justify-content: center;
    font-size: 10px; flex-shrink: 0;
    transition: transform .2s;
  }

  .opcional-toggle.open .arrow { transform: rotate(90deg); }

  .opcional-body {
    display: none; padding-top: 16px;
  }
  .opcional-body.visible { display: block; }

  .hint {
    background: var(--accent-l); border: 1px solid #b7deca;
    border-radius: 8px; padding: 10px 14px;
    font-size: 12px; color: var(--accent);
    margin-bottom: 16px;
  }

  /* Botones */
  .btn {
    width: 100%; padding: 11px;
    border-radius: 9px; border: none;
    font-family: 'DM Sans', sans-serif;
    font-size: 14px; font-weight: 500;
    cursor: pointer; transition: all .15s;
  }

  .btn-primary { background: var(--accent); color: #fff; }
  .btn-primary:hover { background: #235c42; }
  .btn-primary:disabled { opacity: .5; cursor: not-allowed; }

  .btn-ghost {
    background: transparent; color: var(--muted);
    border: 1px solid var(--border); margin-top: 8px;
  }
  .btn-ghost:hover { background: var(--bg); color: var(--text); }

  /* Error global */
  .alert-error {
    background: var(--danger-l); border: 1px solid #f5c6c0;
    border-radius: 8px; padding: 10px 14px;
    font-size: 13px; color: var(--danger);
    margin-bottom: 16px; display: none;
  }
  .alert-error.visible { display: block; }

  /* Success */
  .success-panel {
    padding: 40px 28px; text-align: center; display: none;
  }
  .success-panel.visible { display: block; }

  .success-icon {
    width: 52px; height: 52px; border-radius: 50%;
    background: var(--accent-l); color: var(--accent);
    display: flex; align-items: center; justify-content: center;
    font-size: 22px; margin: 0 auto 16px;
  }

  .success-title { font-size: 18px; font-weight: 500; margin-bottom: 8px; }
  .success-sub   { font-size: 13px; color: var(--muted); margin-bottom: 24px; }

  .login-link {
    text-align: center; margin-top: 20px;
    font-size: 13px; color: var(--muted);
  }
  .login-link a { color: var(--accent); text-decoration: none; font-weight: 500; }
  .login-link a:hover { text-decoration: underline; }

  /* ── Responsive ── */
  @media (max-width: 480px) {
    body { padding: 20px 12px 40px; }
    .card { border-radius: 12px; }
    .panel { padding: 20px 16px; }
    .grid-2 { grid-template-columns: 1fr; }
    .step { padding: 12px 14px; font-size: 12px; }
    input[type="text"], input[type="email"],
    input[type="password"], input[type="tel"],
    select { font-size: 16px; }
  }