/* SHEQ System · TWCD-SHEQ-CSS-001 Rev A
   Brand tokens per docs/brand/BRAND_REFERENCE.md ("Nexus" system, rebranded
   product surface). Dependency-free. British English. */

:root {
  --navy: #0b2c4d;
  --ink-950: #070f1c;
  --blue: #0e7fd1;
  --cyan: #22b8cf;
  --teal: #1193ad;
  --amber: #f7a600;
  --orange: #ff8a3c;
  --ink: #16202c;
  --ink-soft: #47535f;
  --bg: #ffffff;
  --bg-alt: #f4f7fb;
  --line: #e6eaf0;
  --axis: #c3cedb;
  --good: #0ca30c;
  --warning: #fab219;
  --serious: #ec835a;
  --critical: #d03b3b;
  --neutral: #8a97a4;
  --radius: 14px;
  --radius-pill: 999px;
  --shadow: 0 1px 2px rgba(11, 44, 77, .06), 0 8px 24px rgba(11, 44, 77, .07);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg-alt);
}
a { color: var(--blue); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .35rem; letter-spacing: -0.01em; }
h1 { font-size: 1.45rem; font-weight: 800; }
h2 { font-size: 1.08rem; font-weight: 700; }
h3 { font-size: .95rem; font-weight: 700; }
p { margin: 0 0 .8rem; }
button { font: inherit; cursor: pointer; }
input, select, textarea { font: inherit; color: var(--ink); }

/* ---------------- App shell ---------------- */
.app {
  display: grid;
  grid-template-columns: 244px 1fr;
  grid-template-rows: auto 1fr auto;
  grid-template-areas: "side top" "side main" "side foot";
  min-height: 100vh;
}

.side {
  grid-area: side;
  background: linear-gradient(180deg, var(--ink-950), var(--navy));
  color: #d7e3ef;
  padding: 18px 14px 22px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.side .brand {
  display: flex; align-items: center; gap: 10px;
  color: #fff; text-decoration: none; margin-bottom: 4px; padding: 4px 6px;
}
.side .brand img { width: 40px; height: 40px; background: #fff; border-radius: 9px; padding: 2px; }
.side .brand b { display: block; font-size: .92rem; line-height: 1.2; }
.side .brand span.small { display: block; font-size: .68rem; letter-spacing: .06em; text-transform: uppercase; color: #9fb4c9; }
.product-badge {
  margin: 2px 6px 14px;
  font-size: .66rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  color: var(--amber);
}
.nav-group-label {
  font-size: .64rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: #7e93a9; margin: 14px 8px 4px;
}
.nav-link {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; border-radius: 9px;
  color: #d7e3ef; text-decoration: none; font-weight: 600; font-size: .88rem;
  border: 0; background: none; width: 100%; text-align: left;
}
.nav-link:hover { background: rgba(255, 255, 255, .07); }
.nav-link[aria-current="page"] { background: rgba(14, 127, 209, .28); color: #fff; box-shadow: inset 2px 0 0 var(--amber); }
.nav-link .n-ico { width: 20px; height: 20px; flex: 0 0 20px; opacity: .9; }
.nav-count {
  margin-left: auto; font-size: .7rem; font-weight: 700;
  background: rgba(255,255,255,.12); border-radius: var(--radius-pill); padding: 1px 8px;
}
.side-foot { margin-top: auto; padding: 12px 8px 0; font-size: .7rem; color: #8ea3b8; }
.side-foot a { color: #b9cadb; }

.topbar {
  grid-area: top;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  padding: 12px 26px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.topbar .crumb { font-size: .8rem; color: var(--ink-soft); }
.topbar .crumb b { color: var(--ink); }
.top-spacer { flex: 1; }
.env-chip {
  font-size: .72rem; font-weight: 700; padding: 4px 12px; border-radius: var(--radius-pill);
  background: #fdf3dd; color: #7a5200; border: 1px solid #f3dfae;
}

.main { grid-area: main; padding: 22px 26px 34px; max-width: 1340px; width: 100%; }

.app-foot {
  grid-area: foot;
  border-top: 1px solid var(--line);
  background: var(--bg);
  padding: 14px 26px;
  font-size: .78rem; color: var(--ink-soft);
  display: flex; gap: 18px; flex-wrap: wrap; justify-content: space-between;
}

/* ---------------- Page head & toolbar ---------------- */
.page-head { margin-bottom: 16px; }
.page-head p { color: var(--ink-soft); max-width: 72ch; margin-bottom: 0; }
.toolbar {
  display: flex; gap: 10px; flex-wrap: wrap; align-items: end;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 14px; margin: 14px 0 18px; box-shadow: var(--shadow);
}
.toolbar .field { display: flex; flex-direction: column; gap: 3px; }
.toolbar label { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-soft); }
.toolbar select, .toolbar input[type="search"], .toolbar input[type="text"] {
  border: 1px solid var(--axis); border-radius: 8px; padding: 7px 10px; background: #fff; min-width: 150px;
}
.toolbar .grow { flex: 1; }
.toolbar-actions { margin-left: auto; display: flex; gap: 8px; align-items: end; }

.btn {
  border-radius: var(--radius-pill); font-weight: 700; font-size: .84rem;
  padding: 9px 18px; border: 1px solid transparent; display: inline-flex; align-items: center; gap: 7px;
  text-decoration: none;
}
.btn-primary { background: linear-gradient(135deg, var(--blue), #0a66aa); color: #fff; box-shadow: 0 4px 14px rgba(14, 127, 209, .32); }
.btn-primary:hover { filter: brightness(1.06); }
.btn-amber { background: linear-gradient(135deg, var(--amber), var(--orange)); color: #201607; }
.btn-outline { background: #fff; border-color: var(--axis); color: var(--navy); }
.btn-outline:hover { border-color: var(--blue); color: var(--blue); }
.btn-danger { background: #fff; border-color: #e5b6b6; color: var(--critical); }
.btn-sm { padding: 6px 13px; font-size: .78rem; }

/* ---------------- KPI tiles ---------------- */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(172px, 1fr)); gap: 12px; margin-bottom: 18px; }
.tile {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px 12px; box-shadow: var(--shadow); position: relative; overflow: hidden;
}
.tile.clickable { cursor: pointer; }
.tile.clickable:hover { border-color: var(--blue); }
.t-label { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-soft); }
.t-value { font-size: 1.85rem; font-weight: 800; letter-spacing: -0.02em; margin: 2px 0; color: var(--navy); }
.t-note { font-size: .74rem; font-weight: 600; }
.t-note.ok { color: var(--good); }
.t-note.warn { color: #9a6b00; }
.t-note.bad { color: var(--critical); }
.t-note.flat { color: var(--neutral); }

/* ---------------- Cards & charts ---------------- */
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(380px, 1fr)); gap: 16px; margin-bottom: 18px; }
.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; box-shadow: var(--shadow);
}
.card-head { display: flex; align-items: start; gap: 10px; justify-content: space-between; margin-bottom: 8px; }
.card-head .sub { font-size: .78rem; color: var(--ink-soft); margin: 0; }
.chart-svg { width: 100%; height: auto; display: block; }
.axis-txt { font-size: 10.5px; fill: var(--ink-soft); }
.val-txt { font-size: 11px; font-weight: 700; fill: var(--ink); }
.end-lbl { font-size: 11px; font-weight: 700; fill: var(--ink); }
.legend { list-style: none; display: flex; flex-wrap: wrap; gap: 4px 16px; margin: 0 0 6px; padding: 0; font-size: .76rem; color: var(--ink-soft); }
.legend li { display: inline-flex; align-items: center; gap: 6px; }
.key-rect { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.key-line { width: 16px; border-top: 3px solid; display: inline-block; }

/* ---------------- Tables ---------------- */
.table-wrap { overflow-x: auto; }
table.list { width: 100%; border-collapse: collapse; font-size: .84rem; }
table.list caption { text-align: left; font-size: .78rem; color: var(--ink-soft); padding: 4px 0 8px; }
table.list th {
  text-align: left; font-size: .68rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--ink-soft); border-bottom: 2px solid var(--line); padding: 8px 10px; white-space: nowrap;
  cursor: pointer; user-select: none;
}
table.list th.num, table.list td.num { text-align: right; }
table.list td { border-bottom: 1px solid var(--line); padding: 9px 10px; vertical-align: top; }
table.list tbody tr:hover { background: #f0f6fc; }
table.list tbody tr.rowlink { cursor: pointer; }
.list-count { font-size: .78rem; color: var(--ink-soft); }
.cell-sub { display: block; font-size: .72rem; color: var(--ink-soft); }

.chip {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: .72rem; font-weight: 700; border-radius: var(--radius-pill); padding: 3px 10px; white-space: nowrap;
}
.chip-good { background: #e2f4e2; color: #0a6b0a; }
.chip-warning { background: #fdf3dd; color: #7a5200; }
.chip-serious { background: #fceee8; color: #a34a26; }
.chip-critical { background: #fae3e3; color: #a02525; }
.chip-neutral { background: #eef1f4; color: #55626f; }
.chip-blue { background: #e3f0fb; color: #0a5c98; }
.chip-cyan { background: #e0f6fa; color: #0d6e82; }

.risk-pill { font-size: .72rem; font-weight: 700; border-radius: 6px; padding: 2px 8px; white-space: nowrap; }
.risk-very-low { background: #eef1f4; color: #55626f; }
.risk-low { background: #e2f4e2; color: #0a6b0a; }
.risk-medium { background: #fdf3dd; color: #7a5200; }
.risk-high { background: #fae3e3; color: #a02525; }
.cat-pill { font-size: .72rem; font-weight: 800; border-radius: 6px; padding: 2px 8px; background: #e3f0fb; color: #0a5c98; white-space: nowrap; }

/* ---------------- Workflow strip ---------------- */
.flow-strip { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 4px; }
.flow-step {
  font-size: .72rem; font-weight: 600; padding: 5px 11px; border-radius: var(--radius-pill);
  background: #eef1f4; color: var(--ink-soft); position: relative; display: inline-flex; align-items: center; gap: 6px;
}
.flow-step.done { background: #e2f4e2; color: #0a6b0a; }
.flow-step.current { background: var(--navy); color: #fff; }
.flow-step .hold { color: var(--amber); font-weight: 800; }

/* ---------------- Reference (BS 5975) ---------------- */
.ref-note {
  background: #f0f6fc; border: 1px solid #cfe3f5; border-left: 4px solid var(--blue);
  border-radius: 10px; padding: 12px 16px; font-size: .84rem; margin: 0 0 16px;
}
.ref-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 14px; }
.ref-card h3 { display: flex; align-items: center; gap: 8px; }
.ref-card ul { margin: .4rem 0 .2rem; padding-left: 1.15rem; font-size: .84rem; }
.ref-card li { margin-bottom: .3rem; }
table.ref-table { width: 100%; border-collapse: collapse; font-size: .8rem; margin-top: 6px; }
table.ref-table th { background: var(--navy); color: #fff; text-align: left; padding: 7px 9px; font-size: .72rem; }
table.ref-table td { border: 1px solid var(--line); padding: 7px 9px; vertical-align: top; }
table.ref-table tr:nth-child(even) td { background: var(--bg-alt); }

/* ---------------- Modal ---------------- */
.modal-back {
  position: fixed; inset: 0; background: rgba(7, 15, 28, .55); z-index: 60;
  display: flex; align-items: flex-start; justify-content: center; padding: 4vh 16px; overflow-y: auto;
}
.modal {
  background: #fff; border-radius: 16px; width: 680px; max-width: 100%;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .35); padding: 22px 24px 20px; margin-bottom: 6vh;
}
.modal h2 { margin-bottom: 2px; }
.modal .m-sub { font-size: .78rem; color: var(--ink-soft); margin-bottom: 14px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 14px; }
.form-grid .full { grid-column: 1 / -1; }
.f-field { display: flex; flex-direction: column; gap: 4px; }
.f-field label { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-soft); }
.f-field input, .f-field select, .f-field textarea {
  border: 1px solid var(--axis); border-radius: 8px; padding: 8px 10px; background: #fff; width: 100%;
}
.f-field textarea { min-height: 74px; resize: vertical; }
.f-field .hint { font-size: .7rem; color: var(--ink-soft); }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 18px; }
.modal-actions .btn-danger { margin-right: auto; }

/* ---------------- Toast & tooltip ---------------- */
.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%);
  background: var(--ink-950); color: #fff; padding: 10px 20px; border-radius: var(--radius-pill);
  font-size: .84rem; font-weight: 600; z-index: 80; box-shadow: 0 10px 30px rgba(0, 0, 0, .3);
}
.tip {
  position: fixed; z-index: 70; display: none; background: #fff; border: 1px solid var(--line);
  border-radius: 10px; box-shadow: 0 10px 30px rgba(11, 44, 77, .18); padding: 9px 12px; font-size: .76rem; pointer-events: none;
  min-width: 130px;
}
.tip-title { font-weight: 700; margin-bottom: 4px; }
.tip-row { display: flex; align-items: center; gap: 6px; justify-content: space-between; }
.tip-key { width: 12px; border-top: 3px solid; display: inline-block; }
.tip-val { font-weight: 700; margin-left: auto; }

/* ---------------- Utility ---------------- */
.muted { color: var(--ink-soft); }
.small { font-size: .78rem; }
.mt0 { margin-top: 0; }
.mb18 { margin-bottom: 18px; }
[hidden] { display: none !important; }
.skip { position: absolute; left: -999px; }

/* ---------------- Responsive ---------------- */
@media (max-width: 960px) {
  .app { grid-template-columns: 1fr; grid-template-areas: "top" "main" "foot"; }
  .side {
    position: fixed; inset: 0 26% 0 0; z-index: 50; transform: translateX(-102%);
    transition: transform .22s ease; overflow-y: auto; box-shadow: 12px 0 40px rgba(0,0,0,.35);
  }
  .side.open { transform: none; }
  .menu-btn { display: inline-flex !important; }
  .form-grid { grid-template-columns: 1fr; }
  .main { padding: 16px 14px 28px; }
  .topbar { padding: 10px 14px; }
}
.menu-btn {
  display: none; border: 1px solid var(--axis); background: #fff; border-radius: 9px;
  padding: 7px 11px; font-weight: 700; align-items: center; gap: 6px;
}
.side-close { display: none; }
@media (max-width: 960px) {
  .side-close { display: inline-flex; background: none; border: 0; color: #fff; font-size: 1.3rem; margin-left: auto; }
  .side .brand { width: calc(100% - 40px); }
}

@media print {
  .side, .topbar, .toolbar, .app-foot, .btn, .menu-btn { display: none !important; }
  .app { display: block; }
  .main { padding: 0; max-width: none; }
  .card, .tile { box-shadow: none; break-inside: avoid; }
  body { background: #fff; }
}

/* ---------------- Login gate ---------------- */
.login-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: linear-gradient(160deg, var(--ink-950), var(--navy) 65%, #0e3a63);
  display: flex; align-items: center; justify-content: center; padding: 20px; overflow-y: auto;
}
.login-card {
  background: #fff; border-radius: 18px; width: 430px; max-width: 100%;
  padding: 28px 28px 24px; box-shadow: 0 30px 80px rgba(0, 0, 0, .45); margin: auto;
}
.login-card .crest { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.login-card .crest img { width: 46px; height: 46px; }
.login-card .crest b { display: block; font-size: 1.05rem; color: var(--navy); }
.login-card .crest span { display: block; font-size: .72rem; color: var(--ink-soft); letter-spacing: .06em; text-transform: uppercase; }
.login-card h1 { font-size: 1.2rem; margin-bottom: 2px; }
.login-card .lead { font-size: .84rem; color: var(--ink-soft); margin-bottom: 14px; }
.login-card form { display: flex; flex-direction: column; gap: 10px; }
.login-card label { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-soft); }
.login-card input {
  border: 1px solid var(--axis); border-radius: 9px; padding: 10px 12px; width: 100%; font-size: .95rem;
}
.login-error { color: var(--critical); font-size: .8rem; font-weight: 600; min-height: 1.1em; margin: 2px 0 0; }
.login-divider { display: flex; align-items: center; gap: 10px; color: var(--ink-soft); font-size: .72rem; margin: 16px 0 10px; text-transform: uppercase; letter-spacing: .08em; }
.login-divider::before, .login-divider::after { content: ''; flex: 1; border-top: 1px solid var(--line); }
.login-request p { font-size: .8rem; color: var(--ink-soft); margin-bottom: 10px; }
.login-request .price { color: var(--ink); font-weight: 700; }
.login-ok { color: var(--good); font-size: .84rem; font-weight: 700; }
.topbar .signout-btn {
  border: 1px solid var(--axis); background: #fff; border-radius: var(--radius-pill);
  padding: 5px 13px; font-size: .76rem; font-weight: 700; color: var(--navy);
}
.topbar .signout-btn:hover { border-color: var(--blue); color: var(--blue); }