:root {
  --ink: #1f1f24;
  --muted: #6f6b66;
  --line: #ded8cf;
  --paper: #ffffff;
  --panel: #ffffff;
  --accent: #ff7a00;
  --gold: #ffcf17;
  --danger: #b42318;
  --ok: #16784a;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: #f4efe7;
  font-size: 14px;
}
button, input, select {
  font: inherit;
}
button {
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #111;
  font-weight: 800;
  min-height: 40px;
  padding: 0 14px;
  cursor: pointer;
}
button:hover { filter: brightness(.97); }
.secondary {
  background: #2f3035;
  color: #fff;
}
.ghost {
  background: transparent;
  border: 1px solid rgba(255,255,255,.22);
  color: #fff;
}
.hidden { display: none !important; }
.error { color: var(--danger); min-height: 20px; }
.success { color: var(--ok); min-height: 20px; }
.hint { color: var(--muted); margin: 0; }

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 22px;
  background: radial-gradient(circle at top, #35312f 0, #151515 54%, #090909 100%);
}
.login-panel {
  width: min(440px, 100%);
  background: var(--panel);
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 24px 80px rgba(0,0,0,.35);
}
.login-logo {
  display: block;
  width: 190px;
  margin: 0 auto 12px;
}
.login-panel h1 {
  margin: 0 0 22px;
  text-align: center;
  font-size: 24px;
}
.stack { display: grid; gap: 14px; }
label {
  display: grid;
  gap: 7px;
  font-size: 13px;
  font-weight: 800;
  color: #34312f;
}
input, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 40px;
  padding: 8px 10px;
  background: #fff;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 250px 1fr;
}
.sidebar {
  background: #171719;
  color: #fff;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.brand-logo {
  width: 170px;
  align-self: center;
  margin-bottom: 6px;
}
nav {
  display: grid;
  gap: 8px;
}
.nav-button {
  background: transparent;
  color: #fff;
  text-align: left;
  border: 1px solid rgba(255,255,255,.14);
}
.nav-button.active {
  background: #f4c400;
  color: #141414;
}
#logoutBtn { margin-top: auto; }
.content {
  padding: 22px;
  min-width: 0;
}
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}
.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-weight: 900;
  text-transform: uppercase;
  font-size: 12px;
}
h2, h3 { margin: 0; }
.tab-grid {
  display: grid;
  grid-template-columns: minmax(320px, 520px) minmax(360px, 1fr);
  gap: 18px;
  align-items: start;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.three { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.contract-search {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  align-items: end;
}
.preview-zone {
  display: grid;
  gap: 12px;
}
.actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.receipt {
  width: min(100%, 720px);
  background: var(--paper);
  border: 1px solid #d9d9d9;
  border-radius: 8px;
  padding: 22px;
  box-shadow: 0 10px 26px rgba(31, 31, 36, .08);
}
.receipt-head {
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: 1px solid #d8d8d8;
  padding-bottom: 10px;
}
.receipt-head img { width: 96px; }
.receipt-head h3 { font-size: 21px; font-weight: 800; }
.receipt-head p { margin: 3px 0; color: var(--muted); }
.receipt-label {
  color: #b34c00 !important;
  text-transform: uppercase;
  font-weight: 900;
  font-size: 12px;
}
.receipt-number {
  margin: 12px 0 10px;
  font-size: 14px;
  color: #3a342d;
  display: inline-flex;
  gap: 4px;
  padding: 0;
  white-space: nowrap;
}
.receipt-number strong {
  color: var(--ink);
  font-size: 15px;
  display: inline;
}
.receipt-text {
  font-size: 15px;
  line-height: 1.52;
  margin: 8px 0 0;
}
.receipt-detail {
  min-height: 18px;
  font-size: 13px;
  color: #3a342d;
  margin: 8px 0 0;
}
.receipt-foot {
  display: grid;
  grid-template-columns: 1fr 250px;
  align-items: end;
  gap: 24px;
  margin-top: 22px;
}
.receipt-foot p {
  margin: 0 0 5px;
  color: var(--muted);
}
.signature {
  text-align: center;
}
.signature img {
  width: 170px;
  height: 62px;
  object-fit: contain;
  display: block;
  margin: 0 auto -4px;
}
.signature img:not([src]) {
  visibility: hidden;
}
.signature span {
  display: block;
  border-bottom: 1px solid #333;
}
.signature small {
  display: block;
  color: var(--muted);
}
.section-title {
  margin: 18px 0 0;
  font-size: 16px;
}
.signature-tools {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: end;
}
#signatureCanvas {
  width: 100%;
  height: 220px;
  border: 1px dashed #b7aca0;
  border-radius: 8px;
  background: #fff;
  touch-action: none;
}
.list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}
.item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}
.item strong { display: block; }
.item small { color: var(--muted); }
.item-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
  }
  .brand-logo { width: 120px; margin: 0; }
  nav { grid-template-columns: repeat(2, auto); }
  #logoutBtn { margin-top: 0; margin-left: auto; }
  .tab-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .content { padding: 16px; }
  .topbar { align-items: flex-start; flex-direction: column; }
  .two, .three { grid-template-columns: 1fr; }
  .contract-search { grid-template-columns: 1fr; }
  .receipt { padding: 16px; }
  .receipt-head { align-items: center; gap: 12px; }
  .receipt-head img { width: 86px; }
  .receipt-head h3 { font-size: 19px; }
  .receipt-label { font-size: 11px; }
  .receipt-number { margin-top: 10px; }
  .receipt-text { font-size: 14px; }
  .receipt-detail { font-size: 13px; }
  .receipt-foot {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-top: 18px;
  }
  .signature img {
    width: 150px;
    height: 54px;
  }
  .signature-tools { grid-template-columns: 1fr; }
  nav { width: 100%; grid-template-columns: 1fr; }
  #logoutBtn { margin-left: 0; }
}

@media print {
  body { background: #fff; }
  .sidebar, .topbar, .panel, .actions-row { display: none !important; }
  .app-shell, .content, .tab-grid, .preview-zone { display: block; padding: 0; }
  .receipt {
    width: 100%;
    box-shadow: none;
    border: 0;
    padding: 0;
  }
}