/* ── Design tokens ── */
: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: 15px;
  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: 12px;
  left: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  text-decoration: none;
}
.home-logo img { width: 28px; height: 28px; opacity: 0.85; display: block; transition: opacity 0.15s; }
.home-logo:hover img { opacity: 1; }
.home-logo-label {
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--kv-muted);
  transition: color 0.15s;
  white-space: nowrap;
}
.home-logo:hover .home-logo-label { color: var(--kv-accent); }
.app-header-center h1 {
  font-size: 1.45rem;
  font-weight: 700;
  padding: 0 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.app-header-center h1 img { width: 28px; height: 28px; border-radius: 6px; flex-shrink: 0; }
.app-header-center p { color: var(--kv-muted); font-size: 0.85rem; margin-top: 4px; }

.theme-toggle {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--kv-border);
  background: var(--kv-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--kv-muted);
  padding: 0;
  transition: background 0.15s, border-color 0.15s;
}
.theme-toggle:hover { background: var(--kv-card-2); border-color: var(--kv-accent); color: var(--kv-text); }

/* ── Layout ── */
main { max-width: 1120px; margin: 0 auto; padding: 16px; }

.layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
  align-items: start;
}

/* ── Input panel ── */
.input-panel { display: flex; flex-direction: column; gap: 12px; }

.card {
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 10px;
  padding: 16px;
}

.input-group { display: flex; flex-direction: column; gap: 10px; }

.group-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--kv-muted);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--kv-border);
  margin-bottom: 2px;
}

.field { display: flex; flex-direction: column; gap: 4px; }

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

.input-wrap {
  display: flex;
  align-items: center;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 6px;
  overflow: visible;
  position: relative;
}
.input-wrap:focus-within { border-color: var(--kv-accent); }

.currency-prefix {
  padding: 0 8px;
  color: var(--kv-muted);
  font-size: 0.85rem;
  flex-shrink: 0;
}

.money-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--kv-text);
  font-size: 0.9rem;
  padding: 8px 8px 8px 0;
  min-width: 0;
}

.num-input {
  flex: 1;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 6px;
  outline: none;
  color: var(--kv-text);
  font-size: 0.9rem;
  padding: 8px 10px;
  width: 100%;
}
.num-input:focus { border-color: var(--kv-accent); }
.num-input::-webkit-inner-spin-button { opacity: 0.4; }

.unit-suffix {
  padding: 8px 10px 8px 4px;
  color: var(--kv-muted);
  font-size: 0.82rem;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-left: none;
  border-radius: 0 6px 6px 0;
  flex-shrink: 0;
}

.num-with-unit {
  display: flex;
  align-items: stretch;
}
.num-with-unit .num-input {
  border-radius: 6px 0 0 6px;
  border-right: none;
}

.freq-select {
  width: 100%;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 6px;
  color: var(--kv-text);
  font-size: 0.9rem;
  padding: 8px 10px;
  outline: none;
  cursor: pointer;
}
.freq-select:focus { border-color: var(--kv-accent); }

.field-note {
  font-size: 0.78rem;
  color: var(--kv-muted);
  margin-top: 4px;
  line-height: 1.4;
}

/* Month + year inline pair for purchase date inputs */
.month-year-wrap {
  display: grid;
  grid-template-columns: 1fr 90px;
  gap: 8px;
}
.year-input { width: 100%; }

.toggle-group { display: flex; gap: 4px; }
.toggle-btn {
  flex: 1;
  padding: 7px 6px;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 6px;
  color: var(--kv-muted);
  font-size: 0.82rem;
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  text-align: center;
}
.toggle-btn.active {
  background: var(--kv-accent);
  border-color: var(--kv-accent);
  color: #0f172a;
  font-weight: 600;
}
.toggle-btn:not(.active):hover { border-color: var(--kv-accent); color: var(--kv-text); }

.auto-tag {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: rgba(56,189,248,0.12);
  color: var(--kv-accent);
  border-radius: 4px;
  padding: 1px 5px;
}

.reset-btn {
  background: transparent;
  border: none;
  color: var(--kv-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 0 8px;
  flex-shrink: 0;
}
.reset-btn:hover { color: var(--kv-accent); }

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

/* ── Tooltip ── */
.tip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  color: var(--kv-muted);
  font-size: 0.68rem;
  font-style: normal;
  cursor: default;
  position: relative;
  flex-shrink: 0;
}
.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: 20;
  line-height: 1.5;
  font-weight: 400;
}

/* ── Range slider ── */
input[type="range"] {
  width: 100%;
  accent-color: var(--kv-accent);
  height: 4px;
  cursor: pointer;
}

/* ── Buttons ── */
.btn-calculate {
  width: 100%;
  padding: 12px;
  background: var(--kv-accent);
  color: #0f172a;
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s;
  margin-top: 4px;
}
.btn-calculate:hover { background: var(--kv-accent-h); }

.btn-reset {
  width: 100%;
  padding: 8px;
  background: transparent;
  color: var(--kv-muted);
  font-size: 0.82rem;
  border: 1px solid var(--kv-border);
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  margin-top: 4px;
}
.btn-reset:hover { color: var(--kv-text); border-color: var(--kv-muted); }

/* ── Results panel ── */
.results-panel { min-width: 0; display: flex; flex-direction: column; gap: 20px; }
#results { display: flex; flex-direction: column; gap: 20px; }

.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  color: var(--kv-muted);
  font-size: 0.9rem;
  text-align: center;
  border: 1px dashed var(--kv-border);
  border-radius: 10px;
  padding: 32px;
}

/* ── Scenario cards ── */
.scenario-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.summary-card {
  position: relative;
  text-align: center;
  padding: 16px 12px;
  transition: border-color 0.2s;
}
.summary-card.winner {
  border-color: var(--kv-accent);
  background: rgba(56,189,248,0.04);
}

.winner-badge {
  display: none;
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--kv-accent);
  color: #0f172a;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 10px;
  border-radius: 999px;
}
.summary-card.winner .winner-badge { display: block; }

.card-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--kv-muted);
  margin-bottom: 6px;
}
.card-value {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--kv-text);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}
.card-sub { font-size: 0.78rem; color: var(--kv-muted); }

/* ── New-build CGT comparison (inside Rent-vest card) ── */
.cgt-compare-divider { border-top: 1px solid var(--kv-border); margin: 10px 0 6px; }
.cgt-compare-heading { font-size: 0.68rem; font-weight: 700; color: var(--kv-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 5px; }
.cgt-compare-row { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 3px; }
.cgt-method-label { font-size: 0.78rem; color: var(--kv-muted); }
.cgt-method-value { font-size: 0.82rem; font-weight: 600; color: var(--kv-text); }
.cgt-method-value.cgt-best { color: var(--kv-pass); }

/* ── Cash flow table ── */
.cf-table-wrap { overflow-x: auto; }
.cf-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.cf-table th {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--kv-muted);
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--kv-border);
}
.cf-table td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(51,65,85,0.5);
  color: var(--kv-text);
  vertical-align: middle;
}
.cf-table tr:last-child td { border-bottom: none; }
.cf-table .strategy-name { font-weight: 600; }
.cf-table .outflow { font-variant-numeric: tabular-nums; }
.cf-table .owns { color: var(--kv-muted); font-size: 0.8rem; }

/* ── Chart ── */
.chart-card canvas { width: 100% !important; height: 280px !important; display: block; }

.chart-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}
.chart-card-header .card-title { margin-bottom: 0; }

.calc-info-btn {
  flex-shrink: 0;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 6px;
  color: var(--kv-muted);
  font-size: 0.75rem;
  padding: 4px 9px;
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s;
  white-space: nowrap;
}
.calc-info-btn:hover,
.calc-info-btn.active { border-color: var(--kv-accent); color: var(--kv-accent); }

.calc-info-panel {
  display: none;
  margin-bottom: 16px;
  padding: 14px;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  border-radius: 8px;
}

.calc-info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.calc-scenario-title {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.calc-buy-title  { color: #38bdf8; }
.calc-rent-title { color: #4ade80; }
.calc-rv-title   { color: #f59e0b; }

.calc-formula {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.72rem;
  line-height: 1.55;
  color: var(--kv-muted);
  white-space: pre;
  overflow-x: auto;
  margin: 0;
}

.calc-info-note {
  font-size: 0.76rem;
  color: var(--kv-muted);
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--kv-border);
  line-height: 1.5;
}

.card-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--kv-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
  display: block;
}

/* ── Break-even callout ── */
.break-even-note {
  font-size: 0.88rem;
  padding: 10px 14px;
  border-radius: 8px;
  font-weight: 500;
}
.break-even-note.pass {
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.25);
  color: var(--kv-pass);
}
.break-even-note.warn {
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.25);
  color: var(--kv-warn);
}

/* ── Year table ── */
.table-wrap { overflow-x: auto; margin-top: 8px; }

details.card summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
details.card summary::-webkit-details-marker { display: none; }
details.card summary::after {
  content: '+';
  color: var(--kv-muted);
  font-size: 1.1rem;
  line-height: 1;
}
details.card[open] summary::after { content: '−'; }

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  min-width: 640px;
  margin-top: 12px;
  font-variant-numeric: tabular-nums;
}
.schedule-table th {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--kv-muted);
  padding: 6px 10px;
  text-align: right;
  border-bottom: 1px solid var(--kv-border);
  background: var(--kv-card-2);
  white-space: nowrap;
}
.schedule-table th:first-child { text-align: left; }
.schedule-table td {
  padding: 7px 10px;
  text-align: right;
  border-bottom: 1px solid rgba(51,65,85,0.4);
  color: var(--kv-text);
}
.schedule-table td:first-child { text-align: left; color: var(--kv-muted); font-weight: 600; }
.schedule-table tr:last-child td { border-bottom: none; }
.schedule-table tr.final-row td { background: rgba(56,189,248,0.05); font-weight: 600; }
.schedule-table tr.final-row td:first-child { color: var(--kv-accent); }
.td-pass { color: var(--kv-pass) !important; font-weight: 600; }
.td-warn { color: var(--kv-warn) !important; }

/* ── Glossary ── */
.glossary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 24px;
  font-size: 0.78rem;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--kv-border);
}
.glossary-item { color: var(--kv-muted); }
.glossary-item strong { color: var(--kv-text); display: inline-block; min-width: 90px; }

/* ── Budget badge + disclaimer banner ── */
.budget-badge {
  display: inline-block;
  margin-top: 8px;
  padding: 4px 10px;
  background: color-mix(in srgb, var(--kv-pass) 15%, var(--kv-card));
  border: 1px solid var(--kv-pass);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--kv-pass);
  letter-spacing: 0.3px;
}

.disclaimer-banner {
  text-align: center;
  font-size: 0.7rem;
  line-height: 1.5;
  color: var(--kv-muted);
  padding: 6px 24px;
  margin: 0;
}

/* ── Tool info / FAQ (SEO) ── */
.tool-info {
  max-width: 900px;
  margin: 48px auto 0;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.tool-info h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--kv-text);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--kv-border);
}
.tool-about p { font-size: 0.9rem; color: var(--kv-muted); line-height: 1.6; margin-bottom: 8px; }
.faq-item { border-bottom: 1px solid var(--kv-border); padding: 10px 0; }
.faq-item summary {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--kv-text);
  cursor: pointer;
  list-style: none;
  padding-right: 20px;
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; position: absolute; right: 0; color: var(--kv-muted); }
.faq-item[open] summary::after { content: '−'; }
.faq-item p { font-size: 0.85rem; color: var(--kv-muted); line-height: 1.6; margin-top: 8px; }
.faq-item ul { font-size: 0.85rem; color: var(--kv-muted); line-height: 1.6; margin-top: 8px; padding-left: 18px; }
.faq-item li { margin-bottom: 4px; }
.faq-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 6px;
  vertical-align: middle;
  background: color-mix(in srgb, var(--kv-pass) 15%, var(--kv-card));
  border: 1px solid var(--kv-pass);
  color: var(--kv-pass);
  letter-spacing: 0.3px;
}

/* ── Footer ── */
footer {
  margin-top: 56px;
  padding: 24px 20px;
  text-align: center;
  border-top: 1px solid var(--kv-border);
  color: var(--kv-muted);
  font-size: 0.8rem;
}
footer a { color: var(--kv-muted); }
footer a:hover { color: var(--kv-text); }

/* ── Print ── */
.print-inputs { display: none; }
@media print {
  .input-panel, .btn-calculate, .btn-reset { display: none !important; }
  .layout { grid-template-columns: 1fr; }
  .print-inputs { display: block; }
  details[open] { display: block; }
  details summary::after { display: none; }
  * { print-color-adjust: exact; -webkit-print-color-adjust: exact; }
}

/* ── Light mode ── */
html:not(.dark) {
  --kv-bg:     #edf2f7;
  --kv-card:   #d4dce8;
  --kv-card-2: #c5cfe0;
  --kv-text:   #0f172a;
  --kv-muted:  #475569;
  --kv-border: #e2e8f0;
  --kv-accent: #0369a1;
  --kv-warn:   #d97706;
}

/* ── Mobile ── */
@media (max-width: 780px) {
  .layout { grid-template-columns: 1fr; }
  .app-header { display: flex; align-items: flex-start; gap: 8px; padding: 12px 16px; }
  .home-logo { position: static; flex: 0 0 auto; order: 1; padding-top: 6px; }
  .app-header-center { flex: 1; min-width: 0; order: 2; text-align: center; }
  .theme-toggle { position: static; flex: 0 0 auto; order: 3; width: 44px; height: 44px; }
  .app-header-center h1 { font-size: 1.05rem; padding: 0; }
  input, select, textarea { font-size: 16px; }
  .scenario-cards { grid-template-columns: 1fr; }
  .glossary { grid-template-columns: 1fr; }
  .tool-info { grid-template-columns: 1fr; }
  .calc-info-grid { grid-template-columns: 1fr; }
  .calc-formula { white-space: pre-wrap; }
}

@media (max-width: 480px) {
  .scenario-cards { gap: 24px; }
}

/* ── Tool navigation bar ── */
.kv-tool-nav{display:flex;justify-content:center;overflow-x:auto;border-bottom:1px solid var(--kv-border);background:var(--kv-bg);padding:0 16px;scrollbar-width:none;}
.kv-tool-nav::-webkit-scrollbar{display:none;}
.kv-tool-nav a{flex-shrink:0;padding:10px 14px;font-size:0.82rem;font-weight:500;color:var(--kv-muted);text-decoration:none;border-bottom:2px solid transparent;white-space:nowrap;transition:color 0.15s;}
.kv-tool-nav a:hover{color:var(--kv-text);}
.kv-tool-nav a.kv-nav-active{color:var(--kv-accent);border-bottom-color:var(--kv-accent);}
html:not(.dark) .kv-tool-nav{background:#edf2f7;border-color:#e2e8f0;}
html:not(.dark) .kv-tool-nav a{color:#475569;}
html:not(.dark) .kv-tool-nav a:hover{color:#0f172a;}
html:not(.dark) .kv-tool-nav a.kv-nav-active{color:#0369a1;border-bottom-color:#0369a1;}
@media(max-width:800px){.kv-tool-nav{justify-content:flex-start;}}