:root {
  --kv-bg:       #0f172a;
  --kv-card:     #1e293b;
  --kv-card-2:   #273449;
  --kv-text:     #f1f5f9;
  --kv-muted:    #94a3b8;
  --kv-accent:   #38bdf8;
  --kv-accent-h: #0ea5e9;
  --kv-border:   #334155;
  --kv-pass:     #22c55e;
  --kv-fail:     #ef4444;
  --kv-warn:     #f59e0b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--kv-bg);
  color: var(--kv-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

/* ── Header ── */
.app-header {
  padding: 20px 16px 14px;
  border-bottom: 1px solid var(--kv-border);
  position: relative;
  text-align: center;
}
.home-logo {
  position: absolute;
  top: 18px;
  left: 16px;
}
.home-logo img { width: 32px; height: 32px; opacity: 0.9; display: block; }
.home-logo:hover img { opacity: 1; }
.app-header h1 { font-size: 1.5rem; }
.app-header p  { color: var(--kv-muted); font-size: 0.88rem; margin-top: 4px; }

/* ── Layout ── */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
}

.layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
  align-items: start;
}
@media (max-width: 780px) {
  .layout { grid-template-columns: 1fr; }
}

/* ── Tabs ── */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 8px;
  padding: 4px;
}
.tab-btn {
  flex: 1;
  padding: 8px 6px;
  background: transparent;
  color: var(--kv-muted);
  border: none;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  text-align: center;
}
.tab-btn.active {
  background: var(--kv-accent);
  color: var(--kv-bg);
}
.tab-btn:not(.active):hover { color: var(--kv-text); }

/* ── Input panel ── */
.input-panel {
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 10px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--kv-muted);
  margin-bottom: 10px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}
.field:last-child { margin-bottom: 0; }

.field label {
  font-size: 0.82rem;
  color: var(--kv-muted);
  display: flex;
  align-items: center;
  gap: 5px;
}

.field input[type="number"],
.field input[type="text"],
.field input[type="range"],
.field select {
  padding: 9px 11px;
  background: var(--kv-card-2);
  color: var(--kv-text);
  border: 1px solid var(--kv-border);
  border-radius: 6px;
  font-size: 0.95rem;
  width: 100%;
}
.field input[type="number"]:focus,
.field input[type="text"]:focus,
.field select:focus {
  outline: none;
  border-color: var(--kv-accent);
}

.field .hint {
  font-size: 0.75rem;
  color: var(--kv-muted);
}

.field .derived {
  font-size: 0.78rem;
  color: var(--kv-accent);
  margin-top: 1px;
}

.field input[type="range"] {
  padding: 4px 0;
  accent-color: var(--kv-accent);
  cursor: pointer;
}

.range-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--kv-muted);
  margin-top: 2px;
}

.field-group {
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 8px;
  padding: 12px;
}

/* hidden strategy fields */
.strategy-fields { display: none; }
.strategy-fields.active { display: block; }

.btn-calculate {
  width: 100%;
  padding: 12px;
  background: var(--kv-accent);
  color: var(--kv-bg);
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-calculate:hover { background: var(--kv-accent-h); }

/* Auto-repayment badge + reset */
.auto-tag {
  display: inline-block;
  padding: 1px 7px;
  background: rgba(56,189,248,0.12);
  color: var(--kv-accent);
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.3px;
  vertical-align: middle;
}
.auto-tag.hidden { display: none; }

.repayment-row { display: flex; gap: 6px; }
.repayment-row input { flex: 1; }

.repay-reset {
  padding: 0 11px;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 6px;
  color: var(--kv-muted);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  transition: color 0.15s, border-color 0.15s;
}
.repay-reset:hover { color: var(--kv-accent); border-color: var(--kv-accent); }

.btn-pdf {
  width: 100%;
  padding: 10px;
  background: transparent;
  color: var(--kv-muted);
  border: 1px solid var(--kv-border);
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.btn-pdf:hover { color: var(--kv-text); border-color: var(--kv-text); }

.btn-reset {
  width: 100%;
  padding: 8px;
  background: transparent;
  color: var(--kv-muted);
  border: 1px solid var(--kv-border);
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
}
.btn-reset:hover { color: var(--kv-fail); border-color: var(--kv-fail); }

/* ── Warning banner ── */
.warning-banner {
  display: none;
  padding: 10px 14px;
  border-radius: 7px;
  font-size: 0.85rem;
  border: 1px solid;
  margin-bottom: 12px;
}
.warning-banner.warn {
  display: block;
  background: rgba(245,158,11,0.1);
  border-color: var(--kv-warn);
  color: var(--kv-warn);
}
.warning-banner.fail {
  display: block;
  background: rgba(239,68,68,0.1);
  border-color: var(--kv-fail);
  color: var(--kv-fail);
}

/* ── Results panel ── */
.results-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.placeholder {
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 10px;
  padding: 40px 20px;
  text-align: center;
  color: var(--kv-muted);
  font-size: 0.95rem;
}

/* ── Summary cards ── */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
@media (max-width: 500px) {
  .summary-cards { grid-template-columns: 1fr; }
}

.summary-card {
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 8px;
  padding: 14px;
  text-align: center;
}
.summary-card .card-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--kv-muted);
}
.summary-card .card-value {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 4px 0 2px;
}
.summary-card .card-sub {
  font-size: 0.75rem;
  color: var(--kv-muted);
}
.pass  { color: var(--kv-pass); }
.fail  { color: var(--kv-fail); }
.warn  { color: var(--kv-warn); }

/* ── Charts ── */
.chart-card {
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 10px;
  padding: 16px;
}
.chart-card h3 {
  font-size: 0.88rem;
  color: var(--kv-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.chart-card canvas { width: 100% !important; height: 240px !important; display: block; }

/* ── Verdict ── */
.verdict {
  padding: 14px 18px;
  border-radius: 8px;
  border: 1px solid;
  font-size: 0.95rem;
  font-weight: 600;
}
.verdict.pass {
  background: rgba(34,197,94,0.1);
  border-color: var(--kv-pass);
  color: var(--kv-pass);
}
.verdict.warn {
  background: rgba(245,158,11,0.1);
  border-color: var(--kv-warn);
  color: var(--kv-warn);
}
.verdict.fail {
  background: rgba(239,68,68,0.1);
  border-color: var(--kv-fail);
  color: var(--kv-fail);
}

/* ── Year table ── */
.table-card {
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 10px;
  overflow: hidden;
}
.table-card summary {
  padding: 12px 16px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--kv-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.table-card summary::after { content: "▸"; transition: transform 0.2s; }
.table-card[open] summary::after { transform: rotate(90deg); }
.table-card summary::-webkit-details-marker { display: none; }

.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
thead th {
  padding: 8px 12px;
  background: var(--kv-card-2);
  color: var(--kv-muted);
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
  border-bottom: 1px solid var(--kv-border);
}
thead th:first-child { text-align: left; }
tbody td {
  padding: 7px 12px;
  text-align: right;
  border-bottom: 1px solid var(--kv-border);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
tbody td:first-child { text-align: left; font-weight: 600; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--kv-card-2); }
.td-pass { color: var(--kv-pass); }
.td-warn { color: var(--kv-warn); }

/* ── Tooltip ── */
.tip {
  display: inline-block;
  width: 14px;
  height: 14px;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 50%;
  font-size: 0.65rem;
  text-align: center;
  line-height: 13px;
  color: var(--kv-muted);
  cursor: help;
  position: relative;
}
.tip:hover::after {
  content: attr(data-tip);
  position: absolute;
  left: 20px;
  top: -4px;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 0.78rem;
  color: var(--kv-text);
  white-space: pre-wrap;
  width: 220px;
  z-index: 10;
  line-height: 1.4;
  font-weight: 400;
}

/* ── Print / PDF ── */
@media print {
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }

  .tabs, .input-panel, .btn-pdf, footer { display: none !important; }

  .app-header { padding: 12px 0; border-bottom: 1px solid #334155; }
  .home-logo { display: none; }

  main { padding: 0; max-width: 100%; }

  .layout { display: block; }

  .results-panel { display: flex !important; gap: 12px; }

  .placeholder { display: none !important; }

  #results { display: flex !important; }

  /* Force table open for print */
  #yearDetails { display: block; }
  #yearDetails summary { display: none; }

  .chart-card { page-break-inside: avoid; }
  .table-card  { page-break-inside: avoid; }
  .summary-cards { page-break-inside: avoid; }
}