/* =========================================================================
   Mortgage Rate Strategy — Stylesheet
   ========================================================================= */

:root {
  --color-fixed:    #1f4e79;
  --color-variable: #d4820a;
  --color-hedged:   #2e7d32;
  --color-stress:   #c62828;
  --color-invest:   #6a1b9a;
  --color-bg:       #f5f7fa;
  --color-card:     #ffffff;
  --nav-dark:       #0d2137;
  --primary-dark:   #1a3a5c;
}

/* ----- Base ---------------------------------------------------------------- */
body {
  background-color: var(--color-bg);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: #212529;
}

/* ----- Navbar -------------------------------------------------------------- */
.bg-primary-dark { background-color: var(--nav-dark) !important; }

/* ----- Hero Banner --------------------------------------------------------- */
.hero-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, #1f6aa5 50%, #2a9d8f 100%);
  color: #fff;
  border-bottom: 3px solid rgba(255,255,255,0.15);
}

.hero-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 0.925rem;
  color: rgba(255,255,255,0.8);
  max-width: 640px;
}

/* ----- Sidebar section labels ---------------------------------------------- */
.section-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #6c757d;
  margin-bottom: 0.5rem;
}

/* ----- KPI Cards ----------------------------------------------------------- */
.kpi-card {
  border-radius: 10px;
  padding: 1rem 1.25rem;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.kpi-card::after {
  content: '';
  position: absolute;
  top: -20px;
  right: -20px;
  width: 90px;
  height: 90px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
}

.kpi-card .kpi-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.85;
  margin-bottom: 0.25rem;
}

.kpi-card .kpi-value {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.1;
}

.kpi-card .kpi-sub {
  font-size: 0.75rem;
  opacity: 0.8;
  margin-top: 0.25rem;
}

.kpi-fixed    { background: linear-gradient(135deg, #1f4e79, #2980b9); }
.kpi-variable { background: linear-gradient(135deg, #b7590a, #e67e22); }
.kpi-hedged   { background: linear-gradient(135deg, #1b5e20, #2e7d32); }
.kpi-savings  { background: linear-gradient(135deg, #4a148c, #7b1fa2); }

/* ----- Tab panel ----------------------------------------------------------- */
.nav-tabs .nav-link {
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  color: #495057;
}

.nav-tabs .nav-link.active {
  color: var(--primary-dark);
  font-weight: 700;
  border-bottom: 3px solid var(--primary-dark);
}

.tab-content.card {
  border-radius: 0 0 8px 8px;
}

/* ----- Chart wrapper ------------------------------------------------------- */
.chart-wrapper {
  position: relative;
  height: 380px;
}

/* ----- Export buttons ------------------------------------------------------ */
.export-btn-group {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.export-btn-group .btn {
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
}

/* ----- Loading overlay ----------------------------------------------------- */
#loadingOverlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(3px);
}

.loading-box {
  text-align: center;
  background: #fff;
  padding: 2.5rem 3rem;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}

/* ----- Table --------------------------------------------------------------- */
#scheduleTable thead th {
  font-size: 0.75rem;
  white-space: nowrap;
}

#scheduleTable tbody td {
  font-size: 0.8rem;
  white-space: nowrap;
}

/* Highlight lump-sum month */
.lump-sum-row td {
  background-color: #fff3cd !important;
  font-weight: 600;
}

/* ----- Responsive tweaks --------------------------------------------------- */
@media (max-width: 991px) {
  .chart-wrapper { height: 280px; }
  .hero-title    { font-size: 1.3rem; }
}

/* ----- Footer -------------------------------------------------------------- */
.footer { font-size: 0.78rem; }

/* ----- Scrollbar styling --------------------------------------------------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: #c0c0c0; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #999; }