:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --ink: #17202a;
  --muted: #687384;
  --line: #d9dee7;
  --accent: #1967d2;
  --danger: #b42318;
  --ok: #146c43;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  display: flex;
  align-items: stretch;
}
aside {
  flex: 0 0 240px;
  width: 240px;
  min-height: 100vh;
  background: #101820;
  color: #fff;
  padding: 24px 18px;
}
aside h1 { margin: 0 0 28px; font-size: 22px; }
nav { display: grid; gap: 6px; }
nav a {
  color: #dce4ef;
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 6px;
}
nav a.active, nav a:hover { background: #243447; color: #fff; }
main {
  flex: 1 1 auto;
  min-width: 0;
  padding: 28px;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 22px;
}
h2 { margin: 0; }
section, .panel, table {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}
section, .panel { padding: 18px; margin-bottom: 18px; }
.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 14px;
  background: transparent;
  border: 0;
  padding: 0;
}
.card { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 18px; }
.card strong { display: block; font-size: 30px; margin-bottom: 6px; }
.card span, header span { color: var(--muted); }
form { display: grid; gap: 14px; }
.grid-form { grid-template-columns: repeat(5, minmax(120px, 1fr)); align-items: end; }
label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }
input, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 11px;
  font-size: 15px;
  color: var(--ink);
  background: #fff;
}
button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  padding: 10px 14px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.small { padding: 7px 10px; font-size: 13px; }
.danger { background: var(--danger); }
.actions, .toolbar { display: flex; gap: 10px; align-items: end; margin-bottom: 14px; }
.inline { display: inline; margin-left: 8px; }
.check-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 10px 18px;
}
.check {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-size: 15px;
}
.check input { width: auto; }
.signature-preview {
  display: block;
  max-width: 140px;
  max-height: 44px;
  object-fit: contain;
}
.signature-missing {
  color: var(--danger);
  font-size: 12px;
  line-height: 1.35;
}
table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
}
th, td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}
th { background: #eef2f7; font-size: 13px; color: #4a5565; }
.flash {
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 18px;
  background: #e7f5ee;
  color: var(--ok);
  border: 1px solid #bfe6cf;
}
.flash.error { background: #fff1f0; color: var(--danger); border-color: #ffd1cc; }
.danger-zone {
  border-color: #f3b8b3;
  background: #fff8f7;
}
.danger-zone h3 { color: var(--danger); }
.login {
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-box {
  width: min(420px, 100%);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 28px;
}
@media (max-width: 700px) {
  body { display: block; }
  aside {
    width: auto;
    min-height: 0;
  }
  nav { grid-template-columns: repeat(2, 1fr); }
  main { padding: 18px; }
  .cards, .grid-form, .check-grid { grid-template-columns: 1fr; }
  header, .actions, .toolbar { display: grid; }
}