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

:root {
  --kv-bg:      #0f172a;
  --kv-card:    #1e293b;
  --kv-card-2:  #263248;
  --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;
  --kv-super:   #3b82f6;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--kv-bg);
  color: var(--kv-text);
  min-height: 100vh;
  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: 32px; height: 32px; opacity: 0.9; 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 h1 { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; padding: 0 52px; }
.app-header > .app-header-center > p { color: var(--kv-muted); font-size: 0.88rem; margin-top: 4px; }

/* ── Theme toggle ── */

.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);
  font-size: 0.9rem;
  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: 24px 24px 48px;
}

.layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 20px;
  align-items: start;
}

@media (max-width: 800px) {
  input, select, textarea { font-size: 16px; }
  /* Header: 3-column flex — logo | center | toggle, no overlap */
  .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 h1 { font-size: 1.1rem; padding: 0; }
  .app-header > .app-header-center > p { padding: 0; font-size: 0.82rem; }
  .layout { grid-template-columns: 1fr; }
}

/* ── Input panel ── */

.input-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.input-group {
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.group-title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--kv-muted);
  margin-bottom: 2px;
}

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

.field label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--kv-text);
  display: flex;
  align-items: center;
  gap: 4px;
}

.input-wrap {
  display: flex;
  align-items: center;
  background: var(--kv-bg);
  border: 1px solid var(--kv-border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.15s;
}

.input-wrap:focus-within {
  border-color: var(--kv-accent);
}

.currency-prefix,
.pct-suffix {
  padding: 0 10px;
  color: var(--kv-muted);
  font-size: 0.875rem;
  flex-shrink: 0;
  user-select: none;
}

.money-input,
.num-input {
  background: transparent;
  border: none;
  color: var(--kv-text);
  font-size: 0.95rem;
  padding: 9px 10px;
  width: 100%;
  outline: none;
  font-family: inherit;
}

.pct-input {
  text-align: right;
}

.num-input::-webkit-inner-spin-button,
.num-input::-webkit-outer-spin-button {
  opacity: 0.4;
}

/* standalone num inputs (no wrap) */
.field > .num-input {
  background: var(--kv-bg);
  border: 1px solid var(--kv-border);
  border-radius: 8px;
  padding: 9px 12px;
  transition: border-color 0.15s;
}

.field > .num-input:focus {
  border-color: var(--kv-accent);
  outline: none;
}

.derived {
  font-size: 0.8rem;
  color: var(--kv-accent);
  min-height: 1.1em;
}
.derived-info {
  color: var(--kv-pass);
}

/* ── Checkbox label ── */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--kv-text);
  user-select: none;
}
.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--kv-accent);
  cursor: pointer;
  flex-shrink: 0;
}

/* ── Tooltip ── */
.tip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--kv-card-2);
  border: 1px solid var(--kv-border);
  color: var(--kv-muted);
  font-size: 0.65rem;
  font-weight: 700;
  cursor: help;
  position: relative;
  vertical-align: middle;
  margin-left: 4px;
}
.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;
  font-weight: 400;
  color: var(--kv-text);
  white-space: pre-wrap;
  width: min(240px, 80vw);
  z-index: 10;
  line-height: 1.5;
}
@media (max-width: 400px) {
  .tip:hover::after { left: 0; }
}

/* ── Calculate button ── */

.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;
  margin-top: 8px;
  transition: background 0.15s;
}

.btn-calculate:hover { background: var(--kv-accent-h, #0ea5e9); }

/* ── Warning banners ── */

.banner {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.875rem;
  line-height: 1.5;
}

.banner-warn {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--kv-warn);
}

/* ── Results panel ── */

.results-panel {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#results {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ── Placeholder ── */

.placeholder {
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 12px;
  padding: 40px 20px;
  text-align: center;
  color: var(--kv-muted);
  font-size: 0.9rem;
}

/* ── Section title (between card groups) ── */

.section-title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--kv-muted);
  margin-top: 0;
  margin-bottom: -8px;
}

/* ── Strategy cards ── */

.strategy-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 680px) {
  .strategy-cards { grid-template-columns: 1fr; }
}

/* ── Card base ── */

.card {
  background: var(--kv-card);
  border: 1px solid var(--kv-border);
  border-radius: 12px;
  padding: 20px;
  min-width: 0;
}

/* Strategy card colour-coded left borders */
.card-super  { border-left: 3px solid var(--kv-super); }
.card-etf    { border-left: 3px solid var(--kv-pass); }
.card-offset { border-left: 3px solid var(--kv-warn); }

.card-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--kv-muted);
}

.card-value {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--kv-text);
  line-height: 1.1;
}

.card-value.pass { color: var(--kv-pass); }
.card-value.super-color { color: var(--kv-super); }
.card-value.warn { color: var(--kv-warn); }

.card-sub {
  font-size: 0.8rem;
  color: var(--kv-muted);
  margin-top: 4px;
}

.card-sub-combined {
  color: var(--kv-warn);
  font-weight: 600;
}

.card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--kv-text);
  margin-bottom: 14px;
}

/* ── Offset insights card ── */

.offset-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 12px 0 0;
}

@media (max-width: 500px) {
  .offset-stats { grid-template-columns: 1fr; }
}

.offset-stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--kv-muted);
}

.offset-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--kv-warn);
  margin-top: 4px;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.offset-stat-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(245, 158, 11, 0.1);
  color: var(--kv-warn);
  border: 1px solid rgba(245, 158, 11, 0.3);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.offset-stat-badge-warn {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.3);
}

.offset-stat-sub {
  font-size: 0.78rem;
  color: var(--kv-muted);
  margin-top: 3px;
}

.offset-note {
  font-size: 0.85rem;
  color: var(--kv-muted);
  line-height: 1.6;
  padding-top: 14px;
  margin-top: 14px;
  border-top: 1px solid var(--kv-border);
}

.offset-note strong { color: var(--kv-warn); }

.offset-note-warn {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 8px;
  padding: 12px 14px;
  margin-top: 14px;
  color: var(--kv-muted);
}
.offset-note-warn strong { color: #ef4444; }

.offset-mode-selector {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
}

.offset-mode-label {
  font-size: 0.82rem;
  color: var(--kv-muted);
  white-space: nowrap;
}

.offset-mode-select {
  background: var(--kv-bg);
  border: 1px solid var(--kv-border);
  border-radius: 6px;
  color: var(--kv-text);
  font-size: 0.82rem;
  padding: 4px 10px;
  cursor: pointer;
  outline: none;
  font-family: inherit;
  transition: border-color 0.15s;
}

.offset-mode-select:focus { border-color: var(--kv-accent); }

/* ── Chart card ── */

.chart-card {
  padding: 20px;
}

.chart-card canvas { width: 100% !important; height: 260px !important; display: block; }

/* ── Year-by-year table ── */

details.card > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

details.card > summary::after {
  content: '▶';
  font-size: 0.7rem;
  color: var(--kv-muted);
  transition: transform 0.2s;
}

details.card[open] > summary::after {
  transform: rotate(90deg);
}

details.card > summary .card-title {
  margin-bottom: 0;
}

.table-wrap {
  margin-top: 16px;
  overflow-x: auto;
  min-width: 0;
}

.year-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  min-width: 600px;
}

.year-table th {
  text-align: right;
  color: var(--kv-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0 10px 8px;
  border-bottom: 1px solid var(--kv-border);
}

.year-table th:first-child,
.year-table th:nth-child(2) {
  text-align: center;
}

.year-table td {
  text-align: right;
  padding: 8px 10px;
  border-bottom: 1px solid rgba(51,65,85,0.4);
  color: var(--kv-muted);
  font-variant-numeric: tabular-nums;
}

.year-table td:first-child,
.year-table td:nth-child(2) {
  text-align: center;
  color: var(--kv-text);
}

/* Strategy colour classes applied by JS */
.td-super   { color: var(--kv-super) !important; }
.td-etf     { color: var(--kv-pass) !important; }
.td-offset  { color: var(--kv-warn) !important; }
.td-best    { color: var(--kv-pass) !important; font-weight: 600; }

/* ── Footer ── */

footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
  font-size: 0.8rem;
  color: #475569;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

footer a {
  color: var(--kv-muted);
  text-decoration: none;
}

footer a:hover {
  color: var(--kv-accent);
}

/* ── Hidden utility ── */

.hidden { display: none !important; }

/* ── Tool info & FAQ ── */

.tool-info {
  max-width: 900px;
  margin: 48px auto 0;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

@media (max-width: 680px) { .tool-info { grid-template-columns: 1fr; } }

.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; }

/* ── Print ── */

@media print {
  .app-header,
  .input-panel,
  footer { display: none; }

  body { background: white; color: black; }
  .card { border: 1px solid #ccc; break-inside: avoid; }
  details.card > summary::after { display: none; }
  .table-wrap { overflow: visible; }
  .results-panel { display: block; }
}

/* ── Light mode overrides ── */

html:not(.dark) {
  --kv-bg:     #f8fafc;
  --kv-card:   #ffffff;
  --kv-card-2: #f1f5f9;
  --kv-text:   #0f172a;
  --kv-muted:  #64748b;
  --kv-border: #e2e8f0;
}

/* ── Sharesight affiliate block ── */
.sharesight-promo { max-width: 900px; margin: 48px auto 0; padding: 0 20px; }
.sharesight-promo-inner { display: flex; align-items: center; gap: 20px; padding: 18px 22px; background: var(--kv-card); border: 1px solid var(--kv-border); border-radius: 12px; }
.sharesight-logo-wrap { flex: 0 0 auto; background: #fff; border-radius: 8px; padding: 6px 10px; display: flex; align-items: center; }
.sharesight-logo-wrap img { height: 28px; width: auto; display: block; }
.sharesight-copy { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.sharesight-offer { font-size: 0.85rem; color: var(--kv-accent) !important; }
.sharesight-copy > p:not(.sharesight-offer) { font-size: 0.85rem; color: var(--kv-muted); line-height: 1.5; }
.sharesight-cta { flex: 0 0 auto; display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.sharesight-cta a { display: inline-block; padding: 9px 18px; background: var(--kv-accent); color: #0f172a; font-weight: 600; font-size: 0.85rem; border-radius: 8px; text-decoration: none; white-space: nowrap; transition: opacity 0.15s; }
.sharesight-cta a:hover { opacity: 0.85; }
.sharesight-affiliate-note { font-size: 0.7rem; color: var(--kv-muted); text-align: right; }
@media (max-width: 600px) {
  .sharesight-promo-inner { flex-direction: column; align-items: flex-start; gap: 14px; }
  .sharesight-cta { align-items: flex-start; width: 100%; }
  .sharesight-cta a { width: 100%; text-align: center; }
  .sharesight-affiliate-note { text-align: left; }
}