:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --ink: #17202a;
  --muted: #5d6673;
  --line: #e4e7eb;
  --accent: #b9772f;      /* tanah / overburden */
  --accent-ink: #8a5420;
  --c-ob: #b9772f;
  --c-coal: #27313b;
  --c-sr: #2f6fdf;
  --c-a: #2f6fdf;
  --c-b: #b9772f;
  --c-c: #2f9e6b;
  --c-d: #c2416b;
  --ok: #2f9e6b;
  --warn: #b7791f;
  --err: #c0392b;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05);
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.45 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
}
a { color: var(--accent-ink); }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.01em; }
small { color: var(--muted); font-size: .78em; font-weight: 500; }
.muted { color: var(--muted); font-weight: 400; }
.num { font-variant-numeric: tabular-nums; }
.r { text-align: right; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 24px;
  padding: 0 24px; height: 60px;
  background: var(--surface); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 7px; flex: none;
  background: linear-gradient(135deg, var(--c-ob) 0 50%, var(--c-coal) 50% 100%);
}
.brand-title { font-weight: 700; font-size: 15px; line-height: 1.1; }
.brand-sub { font-size: 11.5px; color: var(--muted); }
.nav { display: flex; gap: 2px; flex: 1; }
.nav a {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 12px; border-radius: 8px;
  color: var(--muted); text-decoration: none; font-weight: 500; white-space: nowrap;
}
.nav a:hover { background: var(--bg); color: var(--ink); }
.nav a.active { background: #f6ede3; color: var(--accent-ink); }
.userbox { display: flex; align-items: center; gap: 14px; font-size: 13px; white-space: nowrap; }
.user-name { font-weight: 600; }
.link-sm { font-size: 12.5px; color: var(--muted); }
.link-sm:hover { color: var(--accent-ink); }
.nav-toggle { display: none; margin-left: auto; border: 1px solid var(--line); background: var(--surface); border-radius: 8px; padding: 6px 10px; font-size: 16px; cursor: pointer; }

/* ---------- page ---------- */
.page { max-width: 1440px; margin: 0 auto; padding: 22px 24px 40px; }
.page-head { margin-bottom: 14px; }
.page-head h1 { font-size: 22px; }
.page-head p { margin: 4px 0 0; font-size: 13px; }
.section-title { font-size: 15px; margin: 22px 0 10px; }
.foot { text-align: center; color: var(--muted); font-size: 12px; padding: 0 16px 28px; }

.panel {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 16px 18px; margin-bottom: 16px; min-width: 0;
}
.panel-title { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 12px; }
.panel-title .muted { text-transform: none; letter-spacing: 0; }
.note { font-size: 12px; color: var(--muted); margin: 10px 0 0; }

/* ---------- filters ---------- */
.filters {
  display: flex; flex-wrap: wrap; align-items: flex-end; gap: 14px 18px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 16px; margin-bottom: 16px; box-shadow: var(--shadow);
}
.filters label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--muted); font-weight: 500; }
select, input[type=date], input[type=text], input[type=password], input[type=number], input[type=month], input[type=file] {
  font: inherit; color: var(--ink);
  border: 1px solid #cfd4db; border-radius: 8px; background: #fff;
  padding: 7px 10px; min-height: 36px;
}
select:focus, input:focus { outline: 2px solid #f0d9bf; border-color: var(--accent); }
.seg { display: inline-flex; border: 1px solid #cfd4db; border-radius: 8px; overflow: hidden; height: 36px; }
.seg label { flex-direction: row; align-items: center; padding: 0 14px; cursor: pointer; color: var(--ink); font-size: 13px; border-left: 1px solid #cfd4db; }
.seg label:first-child { border-left: 0; }
.seg label.on { background: var(--ink); color: #fff; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.period { margin-left: auto; text-align: right; display: flex; flex-direction: column; gap: 2px; }
.period-label { font-weight: 600; }
.period .muted { font-size: 12px; }

/* ---------- KPI ---------- */
.kpi-grid { display: grid; grid-template-columns: 1.35fr 1fr 1fr; gap: 16px; }
.kpi-grid .panel { margin-bottom: 0; }
.kpi-grid + .panel { margin-top: 16px; }
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; padding-bottom: 14px; border-bottom: 1px solid var(--line); margin-bottom: 12px; }
.stat { display: flex; flex-direction: column; min-width: 0; }
.stat-label { font-size: 12px; color: var(--muted); }
.stat-val { font-size: 26px; font-weight: 700; letter-spacing: -.02em; font-variant-numeric: tabular-nums; line-height: 1.2; overflow-wrap: anywhere; }
.stat-unit { font-size: 12px; color: var(--muted); }
.stat.hero:first-child .stat-val { color: var(--accent-ink); }
.kv { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; }
.kv.big dd { font-size: 18px; }
.kv.big { row-gap: 10px; }

/* ---------- tables ---------- */
.tbl-wrap { overflow-x: auto; margin: 0 -18px; padding: 0 18px; }
.tbl { width: 100%; border-collapse: collapse; font-size: 13px; }
.tbl th {
  text-align: left; font-weight: 600; font-size: 11.5px; color: var(--muted);
  padding: 8px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; background: #fafbfc;
}
.tbl td { padding: 8px 10px; border-bottom: 1px solid #f0f2f4; white-space: nowrap; font-variant-numeric: tabular-nums; }
.tbl tbody tr:hover td { background: #fbf7f2; }
.tbl tr.total td { font-weight: 700; border-top: 1px solid #cfd4db; background: #fafbfc; }
.tbl tr.hl td:first-child { box-shadow: inset 3px 0 0 var(--accent); }
.tbl.compact td, .tbl.compact th { padding: 7px 8px; }
.tbl .rank { color: var(--muted); width: 36px; }
.tbl th.grp { text-align: center; border-bottom: 2px solid var(--line); }
.tbl th.grp.ob { color: var(--accent-ink); border-bottom-color: var(--c-ob); }
.tbl th.grp.coal { color: var(--c-coal); border-bottom-color: var(--c-coal); }
.badge { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: 11.5px; font-weight: 600; }
.badge.ob { background: #f6ede3; color: var(--accent-ink); }
.badge.coal { background: #e8eaed; color: var(--c-coal); }
.badge.both { background: #e7f0fd; color: #1f56b5; }
.bar-cell { position: relative; }
.bar-cell .bar { position: absolute; left: 0; top: 6px; bottom: 6px; background: #f3e6d6; border-radius: 3px; z-index: 0; }
.bar-cell span { position: relative; z-index: 1; }

/* ---------- charts ---------- */
.chart-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.chart-grid .panel { margin-bottom: 0; }
.chart h3 { font-size: 14px; margin-bottom: 10px; }
.cbox { position: relative; height: 280px; }

/* ---------- forms / buttons / alerts ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  font: inherit; font-weight: 600; border-radius: 8px; padding: 8px 16px; min-height: 36px;
  border: 1px solid var(--ink); background: var(--ink); color: #fff; text-decoration: none;
}
.btn:hover { background: #000; }
.btn.secondary { background: #fff; color: var(--ink); border-color: #cfd4db; }
.btn.secondary:hover { background: var(--bg); }
.btn.danger { background: var(--err); border-color: var(--err); }
.form-grid { display: grid; gap: 14px; max-width: 520px; }
.form-grid label { display: flex; flex-direction: column; gap: 5px; font-weight: 500; font-size: 13px; }
.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; border: 1px solid; font-size: 13.5px; }
.alert-ok { background: #ecf7f1; border-color: #bfe3cf; color: #1d6b47; }
.alert-err { background: #fdeeee; border-color: #f2c3be; color: #8f2a20; }
.alert-info { background: #eef4fd; border-color: #c8d9f5; color: #1f4f9c; }
.steps { margin: 0; padding-left: 20px; }
.steps li { margin-bottom: 6px; }
code { font-family: var(--mono); font-size: .9em; background: #f1f3f5; padding: 1px 5px; border-radius: 4px; }
.pager { display: flex; gap: 6px; align-items: center; margin-top: 12px; flex-wrap: wrap; }
.pager a, .pager span { padding: 4px 10px; border: 1px solid var(--line); border-radius: 6px; text-decoration: none; color: var(--ink); font-size: 13px; }
.pager .cur { background: var(--ink); color: #fff; border-color: var(--ink); }
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; margin-bottom: 12px; }

/* ---------- login ---------- */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card { width: 100%; max-width: 380px; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 28px; box-shadow: 0 10px 30px rgba(16,24,40,.06); }
.login-card .brand { margin-bottom: 20px; }
.login-card .form-grid { max-width: none; }

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .kpi-grid { grid-template-columns: 1fr 1fr; }
  .kpi-grid .panel:first-child { grid-column: 1 / -1; }
}
@media (max-width: 900px) {
  .topbar { flex-wrap: wrap; height: auto; padding: 10px 16px; gap: 10px; }
  .nav-toggle { display: block; }
  .nav, .userbox { display: none; width: 100%; }
  body.nav-open .nav { display: flex; flex-direction: column; }
  body.nav-open .userbox { display: flex; padding: 6px 12px 4px; }
  .page { padding: 16px; }
  .chart-grid { grid-template-columns: 1fr; }
  .period { margin-left: 0; text-align: left; width: 100%; }
}
@media (max-width: 640px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr 1fr; }
  .stat-val { font-size: 22px; }
  .seg label { padding: 0 10px; }
  .cbox { height: 240px; }
}
@media print {
  .topbar, .filters a, .nav-toggle, .foot { display: none; }
  body { background: #fff; }
  .panel { break-inside: avoid; box-shadow: none; }
}