/* ── Fonts ─────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ── CSS Variables (change colours here) ───────────────────── */
:root {
  --primary:       #1d4ed8;   /* main brand blue          */
  --primary-dark:  #1e3a8a;   /* darker shade             */
  --primary-light: #dbeafe;   /* tinted background        */
  --accent:        #0ea5e9;   /* highlight / active       */
  --success:       #16a34a;
  --warning:       #d97706;
  --danger:        #dc2626;
  --neutral-50:    #f8fafc;
  --neutral-100:   #f1f5f9;
  --neutral-200:   #e2e8f0;
  --neutral-400:   #94a3b8;
  --neutral-600:   #475569;
  --neutral-800:   #1e293b;
  --font:          'Inter', sans-serif;
  --radius:        8px;
  --shadow:        0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.06);
}

/* ── Base ───────────────────────────────────────────────────── */
* { box-sizing: border-box; }

body {
  font-family: var(--font);
  background: var(--neutral-50);
  color: var(--neutral-800);
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}

/* ── Navbar ─────────────────────────────────────────────────── */
.navbar {
  background: var(--primary-dark) !important;
  border-bottom: 3px solid var(--accent);
  padding: 0 24px !important;
  min-height: 56px;
}

.navbar-brand {
  color: #fff !important;
  font-weight: 700 !important;
  font-size: 16px !important;
  letter-spacing: .3px;
}

/* ── Tabs ───────────────────────────────────────────────────── */
.navbar-nav > li > a {
  color: rgba(255,255,255,.75) !important;
  font-weight: 500 !important;
  font-size: 13px !important;
  padding: 18px 20px !important;
  transition: color .2s, border-bottom .2s;
  border-bottom: 3px solid transparent;
  margin-bottom: -3px;
}

.navbar-nav > li > a:hover,
.navbar-nav > li.active > a {
  color: #fff !important;
  border-bottom: 3px solid var(--accent) !important;
  background: transparent !important;
}

.navbar-nav > li.active > a {
  background: rgba(255,255,255,.08) !important;
}

/* ── Page container ─────────────────────────────────────────── */
.container-fluid { padding: 28px 32px !important; }

/* ── Page title banner ──────────────────────────────────────── */
.page-header-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

.page-header-banner h2 {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 700;
}

.page-header-banner p {
  margin: 0;
  opacity: .8;
  font-size: 13px;
}

/* ── Cards ──────────────────────────────────────────────────── */
.dash-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  margin-bottom: 20px;
  border: 1px solid var(--neutral-200);
}

.dash-card h4 {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-dark);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--neutral-200);
}

/* ── KPI tiles ──────────────────────────────────────────────── */
.kpi-row { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }

.kpi-tile {
  flex: 1;
  min-width: 140px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--neutral-200);
  padding: 18px 20px;
  text-align: center;
}

.kpi-tile .kpi-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.1;
}

.kpi-tile .kpi-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .7px;
  color: var(--neutral-600);
  margin-top: 4px;
}

.kpi-tile.kpi-success .kpi-value { color: var(--success); }
.kpi-tile.kpi-warning .kpi-value { color: var(--warning); }
.kpi-tile.kpi-danger  .kpi-value { color: var(--danger);  }

/* ── Buttons ────────────────────────────────────────────────── */
.btn-primary {
  background: var(--primary) !important;
  border-color: var(--primary) !important;
  border-radius: var(--radius) !important;
  font-weight: 600 !important;
  font-size: 13px !important;
  padding: 8px 18px !important;
  transition: background .2s !important;
}
.btn-primary:hover { background: var(--primary-dark) !important; }

/* ── Tables ─────────────────────────────────────────────────── */
table.dataTable thead {
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .5px;
}

table.dataTable tbody tr:hover { background: var(--neutral-100) !important; }

/* ── Upload area ────────────────────────────────────────────── */
.shiny-input-container .progress-bar { background-color: var(--primary) !important; }

.upload-zone {
  border: 2px dashed var(--neutral-400);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  color: var(--neutral-600);
  background: var(--neutral-100);
  transition: border-color .2s;
}
.upload-zone:hover { border-color: var(--primary); }

/* ── Alerts / messages ──────────────────────────────────────── */
.alert-custom {
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 13px;
  margin-bottom: 16px;
}

.alert-info-custom {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  color: var(--primary-dark);
}

/* ── Footer ─────────────────────────────────────────────────── */
.app-footer {
  text-align: center;
  color: var(--neutral-400);
  font-size: 11px;
  padding: 20px 0 8px;
  border-top: 1px solid var(--neutral-200);
  margin-top: 32px;
}