:root {
  --bg: #f4f6f8; --panel: #ffffff; --line: #dde3ea; --text: #1f2933; --muted: #6b7a89;
  --primary: #0b5d8a; --primary-dark: #084a6e; --accent: #0e9f6e; --danger: #c0392b; --warn: #d97706;
  --side: #10243a; --side-text: #c9d6e3; --side-active: #1c3d5e;
  --radius: 6px; --font: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { font: 15px/1.45 var(--font); color: var(--text); background: var(--bg); min-height: 100vh; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* layout */
.layout { display: grid; grid-template-columns: 230px 1fr; min-height: 100vh; }
.side { background: var(--side); color: var(--side-text); padding: 18px 0; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.brand { color: #fff; font-weight: 700; font-size: 18px; padding: 0 20px 16px; letter-spacing: .3px; }
.brand small { display: block; font-weight: 400; font-size: 12px; color: var(--side-text); }
.nav h4 { margin: 14px 20px 4px; font-size: 11px; text-transform: uppercase; letter-spacing: .8px; color: #7f93a8; }
.nav a { display: block; padding: 8px 20px; color: var(--side-text); }
.nav a:hover { background: var(--side-active); color: #fff; text-decoration: none; }
.nav a.active { background: var(--side-active); color: #fff; border-left: 3px solid var(--accent); padding-left: 17px; }
.main { display: flex; flex-direction: column; min-width: 0; }
.topbar { background: var(--panel); border-bottom: 1px solid var(--line); padding: 10px 28px; display: flex; justify-content: space-between; align-items: center; }
.topbar .who { color: var(--muted); font-size: 14px; }
.topbar .who b { color: var(--text); }
.content { padding: 24px 28px; max-width: 1400px; }
h1 { font-size: 22px; margin: 0 0 18px; }
h2 { font-size: 17px; margin: 24px 0 10px; }
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 16px; flex-wrap: wrap; }
.page-head h1 { margin: 0; }

/* panels & tables */
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 18px; }
table.grid { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
table.grid th, table.grid td { padding: 9px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
table.grid th { background: #eef2f6; font-weight: 600; font-size: 13px; color: #3b4a59; }
table.grid tr:last-child td { border-bottom: none; }
table.grid tbody tr:hover { background: #f7fafc; }
table.grid td.num, table.grid th.num { text-align: right; font-variant-numeric: tabular-nums; }
.ok { color: var(--accent); font-weight: 700; }
.muted { color: var(--muted); }
.low { color: var(--danger); font-weight: 600; }
.empty { padding: 28px; text-align: center; color: var(--muted); background: var(--panel); border: 1px dashed var(--line); border-radius: var(--radius); }

/* buttons */
.btn { display: inline-block; padding: 8px 14px; border-radius: var(--radius); border: 1px solid var(--primary); background: var(--primary); color: #fff; font: inherit; cursor: pointer; line-height: 1.2; }
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn.secondary { background: #fff; color: var(--primary); }
.btn.secondary:hover { background: #eef5fa; }
.btn.small { padding: 5px 10px; font-size: 13px; }
.actions { display: flex; gap: 10px; align-items: center; margin-top: 18px; flex-wrap: wrap; }

/* forms */
form .field { margin-bottom: 14px; }
form label { display: block; font-weight: 600; font-size: 13px; margin-bottom: 4px; }
form input[type=text], form input[type=number], form input[type=email], form input[type=password], form select, form textarea {
  width: 100%; max-width: 520px; padding: 8px 10px; border: 1px solid #b9c4cf; border-radius: var(--radius); font: inherit; background: #fff;
}
form input:focus, form select:focus, form textarea:focus { outline: 2px solid #9cc3dc; border-color: var(--primary); }
form .help { color: var(--muted); font-size: 12px; margin-top: 3px; }
form .errors { color: var(--danger); font-size: 13px; margin-top: 3px; }
form .checkbox label { display: inline; font-weight: 500; margin-left: 6px; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 0 28px; max-width: 1100px; }
.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 14px; }
.toolbar input[type=text] { padding: 7px 10px; border: 1px solid #b9c4cf; border-radius: var(--radius); font: inherit; min-width: 240px; }
.toolbar label { font-size: 13px; color: var(--muted); }
.nonfield { color: var(--danger); margin-bottom: 12px; }

/* messages */
.messages { list-style: none; padding: 0; margin: 0 0 16px; }
.messages li { padding: 10px 14px; border-radius: var(--radius); margin-bottom: 8px; background: #e6f6ee; border: 1px solid #b7e4cc; color: #14532d; }
.messages li.error { background: #fdecea; border-color: #f5c6c2; color: #7f1d1d; }

/* dashboard tiles */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 20px; }
.tile { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.tile .n { font-size: 28px; font-weight: 700; color: var(--primary); }
.tile .l { color: var(--muted); font-size: 13px; }

/* pagination */
.pager { display: flex; gap: 8px; align-items: center; margin-top: 14px; color: var(--muted); font-size: 14px; }

/* login */
.login-wrap { min-height: 100vh; display: grid; place-items: center; background: var(--side); }
.login { background: #fff; padding: 32px 36px; border-radius: 10px; width: 360px; box-shadow: 0 10px 40px rgba(0,0,0,.35); }
.login h1 { font-size: 20px; margin: 0 0 4px; }
.login .sub { color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.login .btn { width: 100%; padding: 10px; margin-top: 6px; }

/* formset */
table.formset { width: 100%; border-collapse: collapse; max-width: 700px; }
table.formset th, table.formset td { padding: 6px 8px; border-bottom: 1px solid var(--line); text-align: left; }
table.formset input, table.formset select { max-width: 100%; }

/* tablet */
@media (max-width: 1024px) {
  .layout { grid-template-columns: 190px 1fr; }
  .content { padding: 18px 16px; }
  .topbar { padding: 10px 16px; }
}