:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --ink: #1f2933;
  --muted: #5b6b7a;
  --accent: #2d6cdf;
  --accent-dark: #1f4fa3;
  --border: #d6dde4;
  --error: #b00020;
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg);
  color: var(--ink);
  margin: 0;
  line-height: 1.5;
}

h1, h2 { margin: 0 0 0.25rem; }
.subtitle { color: var(--muted); margin: 0 0 1.5rem; }

/* Login */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.login-card {
  background: var(--card);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
  width: 100%;
  max-width: 380px;
}
.login-card label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
}
.login-card input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}
.login-card button, #submitBtn {
  width: 100%;
  padding: 0.75rem;
  background: var(--accent);
  color: white;
  border: 0;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
.login-card button:hover, #submitBtn:hover { background: var(--accent-dark); }

/* Form page */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.logout-form { margin: 0; }
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.ghost-button {
  background: var(--card);
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 6px;
  padding: 0.45rem 0.9rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.ghost-button:hover {
  background: var(--accent);
  color: white;
}
.link-button {
  background: none;
  border: 0;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.95rem;
}

.form-wrap {
  max-width: 760px;
  margin: 2rem auto;
  background: var(--card);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.05);
}
.intro { color: var(--muted); margin-bottom: 1.5rem; }

fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem 1.25rem;
  margin-bottom: 1.25rem;
}
legend { font-weight: 600; padding: 0 0.5rem; }

label {
  display: block;
  font-weight: 600;
  margin-top: 0.75rem;
  margin-bottom: 0.25rem;
}
input[type=text] {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
}
.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.sig-pad-wrap {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 0.5rem;
  background: #fff;
}
canvas[data-sig] {
  display: block;
  width: 100%;
  height: 160px;
  background: #fff;
  border-radius: 4px;
  touch-action: none;
}
.clear-sig {
  margin-top: 0.5rem;
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}

.certify {
  font-weight: 600;
  margin: 1rem 0;
}
.error { color: var(--error); margin: 0.5rem 0; }
.status { margin-top: 0.75rem; min-height: 1.2em; }
.status.error { color: var(--error); }
.status.ok { color: #1f7a4d; }

@media (max-width: 600px) {
  .row { grid-template-columns: 1fr; }
  .form-wrap { margin: 0; border-radius: 0; padding: 1.25rem; }
}