:root {
  --navy:        #14324d;
  --navy-dark:   #0d2438;
  --slate:       #3d5a73;
  --accent:      #2f9e6e;
  --accent-pale: #e8f6ef;
  --amber:       #d99a2b;
  --bg:          #f4f6f8;
  --card-bg:     #ffffff;
  --text-body:   #33414d;
  --text-muted:  #667685;
  --border:      #dde3e8;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, "Segoe UI", Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text-body); }

/* Header */
.app-header {
  background: var(--navy);
  padding: 16px 24px;
  border-bottom: 3px solid var(--accent);
}
.app-header h1 { color: #fff; font-size: 20px; font-weight: 700; }
.app-header .subtitle { color: var(--accent); font-size: 10px; letter-spacing: 2px; margin-top: 3px; }

/* Tabs */
.tab-nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; background: var(--navy-dark);
  border-bottom: 2px solid rgba(47,158,110,0.35);
}
.tab-btn {
  padding: 12px 22px; color: rgba(255,255,255,0.55);
  font-size: 13px; font-weight: 600; cursor: pointer; border: none; background: none;
  border-bottom: 2px solid transparent; margin-bottom: -2px;
  transition: color 0.15s;
}
.tab-btn:hover { color: rgba(255,255,255,0.85); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

.tab-panel { display: none; padding: 20px; }
.tab-panel.active { display: block; }

/* Global loan-terms input bar */
.inputs-bar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex; gap: 22px; flex-wrap: wrap; align-items: flex-end;
}
.input-field { display: flex; flex-direction: column; gap: 4px; min-width: 110px; }
.input-field label { font-size: 10px; font-weight: 700; color: var(--slate); text-transform: uppercase; letter-spacing: 0.5px; }
.input-field input[type="number"], .input-field input[type="date"] {
  border: 1px solid var(--border); border-radius: 4px; padding: 6px 8px;
  font-size: 13px; color: var(--text-body); width: 140px;
}
.slider-field { min-width: 220px; }
.slider-field label { white-space: nowrap; }
.slider-field input[type="range"] { width: 100%; accent-color: var(--accent); }

/* As-of-years row (dashboard) */
.as-of-row {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 14px 18px; margin-bottom: 18px;
  display: flex; align-items: center; gap: 16px;
}
.as-of-row label { font-size: 13px; color: var(--text-body); flex-shrink: 0; }
.as-of-row input[type="range"] { flex: 1; accent-color: var(--accent); }

/* Stat cards */
.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px; margin-bottom: 20px;
}
.stat-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 14px 16px;
}
.stat-card.highlight { background: var(--navy); border-color: var(--navy); }
.stat-card.highlight .stat-label { color: var(--accent); }
.stat-card.highlight .stat-val { color: #fff; }
.stat-card.savings { background: var(--accent-pale); border-color: var(--accent); }
.stat-card.savings .stat-val { color: var(--accent); }
.stat-label { font-size: 10px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.stat-val { font-size: 22px; font-weight: 700; color: var(--navy); margin-top: 6px; }
.stat-sub { font-size: 11px; color: var(--text-muted); margin-top: 4px; }

/* Monthly Payment tab */
.mp-tables-row { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.mp-table-card { flex: 1 1 340px; margin-bottom: 0; }
.mp-summary-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.mp-summary-table th {
  text-align: right; padding: 6px 8px; border-bottom: 2px solid var(--border);
  font-size: 10px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px;
}
.mp-summary-table th:first-child { text-align: left; }
.mp-summary-table td { text-align: right; padding: 10px 8px; border-bottom: 1px solid var(--border); font-weight: 600; color: var(--navy); }
.mp-summary-table td:first-child { text-align: left; font-weight: 700; color: var(--text-body); }
.mp-summary-table tr:last-child td { border-bottom: none; }
.mp-summary-table td.diff-cell { color: var(--accent); }
.mp-chart-wrap { height: 380px; }
.mp-paid-off-note {
  display: none; margin-top: 12px; padding: 10px 14px;
  background: var(--accent-pale); border: 1px solid var(--accent); border-radius: 6px;
  color: var(--navy); font-size: 12px; font-weight: 600; text-align: center;
}
.mp-paid-off-note.visible { display: block; }

/* Chart cards */
.chart-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 16px 18px; margin-bottom: 18px;
}
.chart-card h3 { font-size: 13px; font-weight: 700; color: var(--navy); margin-bottom: 12px; }
.chart-canvas-wrap { position: relative; height: 320px; width: 100%; }
.chart-canvas-wrap canvas { position: absolute; top: 0; left: 0; width: 100% !important; height: 100% !important; }

/* Action bar (table tab) */
.action-bar {
  display: flex; gap: 14px; align-items: center; flex-wrap: wrap;
  margin-bottom: 14px;
}
.segmented { display: inline-flex; border: 1px solid var(--border); border-radius: 5px; overflow: hidden; }
.seg-btn {
  border: none; background: #fff; color: var(--text-body); padding: 7px 14px;
  font-size: 12px; font-weight: 600; cursor: pointer; border-right: 1px solid var(--border);
}
.seg-btn:last-child { border-right: none; }
.seg-btn.active { background: var(--navy); color: #fff; }
.btn-outline {
  background: #fff; color: var(--navy); border: 1px solid var(--navy);
  padding: 7px 16px; font-size: 12px; font-weight: 700; border-radius: 5px; cursor: pointer;
}
.btn-outline:hover { background: var(--navy); color: #fff; }
.status-text { margin-left: auto; color: var(--text-muted); font-size: 11px; }

/* Amortization table */
.table-wrap { background: var(--card-bg); border: 1px solid var(--border); border-radius: 6px; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 12px; }
th {
  background: var(--navy); color: #fff; padding: 9px 10px; text-align: right;
  font-weight: 600; white-space: nowrap; position: sticky; top: 0;
}
th:nth-child(2) { text-align: left; }
td { padding: 7px 10px; text-align: right; border-bottom: 1px solid var(--border); font-family: 'Courier New', monospace; }
td:nth-child(2) { text-align: left; font-family: inherit; }

tr.year-row { cursor: pointer; background: #f7f9fb; font-weight: 700; }
tr.year-row:hover { background: #eef2f5; }
tr.year-row td { border-bottom: 1px solid var(--border); }
tr.year-row .chevron { display: inline-block; transition: transform 0.15s; margin-right: 6px; color: var(--accent); }
tr.year-row.expanded .chevron { transform: rotate(90deg); }
tr.month-row { display: none; }
tr.month-row.visible { display: table-row; }
tr.month-row td:first-child { color: var(--text-muted); }
tr.month-row.prepay-row td { background: var(--accent-pale); }

@media (max-width: 700px) {
  .inputs-bar { flex-direction: column; align-items: stretch; }
  .input-field, .slider-field { min-width: 0; width: 100%; }
  .input-field input[type="number"], .input-field input[type="date"] { width: 100%; }
}