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

:root {
  --bg: #FFFFFF;
  --surface: #F8FAFC;
  --border: #E2E8F0;
  --border-strong: #CBD5E1;
  --ink: #0F172A;
  --ink-2: #1E293B;
  --ink-3: #475569;
  --ink-mute: #64748B;
  --accent: #B45309;
  --accent-soft: #FED7AA;
  --link: #1E40AF;
  --danger: #B91C1C;
  --radius: 8px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink-2);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: Georgia, 'Times New Roman', serif;
  color: var(--ink);
  line-height: 1.2;
  font-weight: 400;
}

h1 { font-size: 2.75rem; letter-spacing: -0.01em; }
h2 { font-size: 1.25rem; letter-spacing: -0.005em; }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.nav {
  background: var(--ink);
  padding: 0 1.5rem;
}
.nav-inner {
  max-width: 880px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 54px;
}
.nav-brand {
  font-family: Georgia, serif; font-size: 1.0625rem;
  color: #FFFFFF;
}
.nav-brand:hover { color: #E2E8F0; text-decoration: none; }
.nav-links a { color: #CBD5E1; font-size: 0.9375rem; margin-left: 1.5rem; }
.nav-links a:hover { color: #FFFFFF; text-decoration: none; }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 5rem;
}

.lead {
  color: var(--ink-3);
  font-size: 1.125rem;
  margin: 0.5rem 0 1rem;
}

.builder-tools {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  margin: 0 0 0.5rem;
  font-size: 0.875rem;
  flex-wrap: wrap;
}
.builder-tools-hint {
  color: var(--ink-mute);
  transition: color 200ms ease;
}
.builder-tools-hint[data-state=ok] { color: var(--ink-3); }
.builder-tools-hint[data-state=error] { color: var(--danger); }

.field {
  margin-bottom: 2.25rem;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--border);
}
.field:last-of-type { border-bottom: none; }

.field-label {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 0.875rem;
}
.field-label h2 { margin: 0; }
.field-aside {
  color: var(--ink-mute);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.options { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.option {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--ink-3);
  font-size: 0.9375rem;
  cursor: pointer;
  user-select: none;
  transition: border-color 120ms ease, background-color 120ms ease, color 120ms ease;
}
.option:hover { border-color: var(--ink-mute); color: var(--ink-2); }
.option input { position: absolute; opacity: 0; pointer-events: none; }
.option:has(input:checked) {
  background: var(--ink);
  border-color: var(--ink);
  color: #FFFFFF;
}
.option:has(input:disabled) {
  opacity: 0.45;
  cursor: not-allowed;
}

.custom-range {
  display: flex; align-items: center; gap: 0.5rem;
  margin-top: 0.75rem;
}
.custom-range input[type=number] {
  width: 5.5rem;
  padding: 0.5rem 0.625rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  font: inherit;
  color: var(--ink-2);
}
.custom-range input[type=number]:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.custom-range span { color: var(--ink-mute); font-size: 0.9375rem; }

.sectors {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.5rem;
}
.sector {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink-2);
  font-size: 0.9375rem;
  cursor: pointer;
  user-select: none;
  transition: border-color 120ms ease, background-color 120ms ease;
}
.sector:hover { border-color: var(--border-strong); }
.sector input { width: 1rem; height: 1rem; accent-color: var(--ink); cursor: pointer; }
.sector:has(input:not(:checked)) { color: var(--ink-mute); background: var(--bg); }

.sector-actions {
  margin-top: 0.75rem;
  font-size: 0.875rem;
}
.sector-actions button {
  background: none; border: none; padding: 0;
  color: var(--link); font: inherit; cursor: pointer;
}
.sector-actions button:hover { text-decoration: underline; }
.sector-actions span { color: var(--border-strong); margin: 0 0.5rem; }

.cap-field { transition: opacity 200ms ease; }
.cap-field[hidden] { display: none; }
.cap-field.disabled { opacity: 0.4; pointer-events: none; }

.preview {
  margin: 2.5rem 0;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
}
.preview-count {
  font-size: 1.5rem;
  color: var(--ink);
  font-weight: 500;
}
.preview-count[data-loading=true] { color: var(--ink-mute); }
.preview-label {
  color: var(--ink-3);
  font-size: 0.9375rem;
  margin-top: 0.125rem;
}

.name-field { margin-bottom: 2rem; }
.name-field input {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: Georgia, serif;
  font-size: 1.5rem;
  color: var(--ink);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg);
}
.name-field input::placeholder { color: var(--ink-mute); font-style: italic; }
.name-field input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.name-field-hint {
  margin-top: 0.5rem;
  color: var(--ink-mute);
  font-size: 0.875rem;
}
.name-field-counter { float: right; font-variant-numeric: tabular-nums; }
.name-field-counter[data-state=warn] { color: var(--accent); }
.name-field-counter[data-state=full] { color: var(--danger); }

.generate {
  width: 100%;
  padding: 1rem 1.5rem;
  font: inherit;
  font-size: 1.0625rem;
  font-weight: 500;
  color: #FFFFFF;
  background: var(--ink);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 120ms ease, opacity 120ms ease;
}
.generate:hover:not(:disabled) { background: #000000; }
.generate:disabled { opacity: 0.4; cursor: not-allowed; }

.footer {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--ink-mute);
  font-size: 0.875rem;
}
.footer a { color: var(--ink-3); }

/* ---------- Email modal ---------- */

dialog.email-modal {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 0;
  max-width: 460px;
  width: calc(100% - 2rem);
  box-shadow: 0 16px 48px -12px rgba(15, 23, 42, 0.25);
}
dialog.email-modal::backdrop {
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(2px);
}
.email-form {
  padding: 2rem;
}
.email-form h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}
.email-form p {
  color: var(--ink-3);
  font-size: 0.9375rem;
  margin-bottom: 1.25rem;
}
.email-form input[type=email] {
  width: 100%;
  padding: 0.75rem 0.875rem;
  font: inherit;
  font-size: 1rem;
  color: var(--ink);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg);
}
.email-form input[type=email]:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.email-modal-actions {
  display: flex; gap: 0.75rem; margin-top: 1.25rem;
}
.email-modal-actions .generate { flex: 1; }
.btn-secondary {
  padding: 0.75rem 1rem;
  font: inherit;
  font-size: 0.9375rem;
  color: var(--ink-2);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: border-color 120ms ease, background-color 120ms ease;
}
.btn-secondary:hover { border-color: var(--ink-mute); background: var(--surface); text-decoration: none; }
.email-error {
  color: var(--danger);
  font-size: 0.875rem;
  margin-top: 0.75rem;
  margin-bottom: 0;
}

/* ---------- Chart page ---------- */

.chart-main { max-width: 880px; }

.chart-header {
  margin-bottom: 1.5rem;
}
.index-title {
  font-size: 2.5rem;
  letter-spacing: -0.015em;
  margin-bottom: 0.5rem;
}
.perf-line {
  display: flex; align-items: baseline; gap: 0.5rem;
  font-family: 'Inter', sans-serif;
  flex-wrap: wrap;
}
.perf-index {
  font-size: 2rem;
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.perf-index.win { color: #047857; }
.perf-vs {
  color: var(--ink-mute);
  font-size: 1rem;
}
.perf-bench-name {
  color: var(--ink-3);
  font-size: 1rem;
}
.perf-bench {
  font-size: 1.125rem;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}
.perf-sep {
  color: var(--ink-mute);
  margin: 0 0.125rem;
}
.perf-period {
  color: var(--ink-mute);
  font-size: 0.9375rem;
}

.chart-shell {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1rem 0.5rem;
  margin-bottom: 1.5rem;
}
.chart {
  width: 100%;
  height: 420px;
}
.watermark {
  position: absolute;
  bottom: 12px;
  right: 18px;
  color: var(--ink-mute);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  pointer-events: none;
}

.benchmark-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.5rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-radius: var(--radius);
}
.benchmark-legend-label {
  color: var(--ink-mute);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-right: 0.25rem;
}
.benchmark-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.75rem;
  font: inherit;
  font-size: 0.875rem;
  color: var(--ink-mute);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 120ms ease, color 120ms ease, background-color 120ms ease;
}
.benchmark-pill:hover { border-color: var(--ink-mute); }
.benchmark-pill[data-active="1"] {
  background: var(--bg);
  border-color: var(--ink-2);
  color: var(--ink);
}
.benchmark-pill[data-active="0"] .benchmark-swatch { opacity: 0.35; }
.benchmark-swatch {
  display: inline-block;
  width: 1rem;
  height: 0.25rem;
  border-radius: 2px;
  background: #94A3B8;
  flex-shrink: 0;
}
.benchmark-name { color: inherit; }
.benchmark-delta {
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}
.benchmark-pill[data-active="0"] .benchmark-delta { color: var(--ink-mute); }

.composition {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}
.composition-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9375rem;
}
.composition-row:last-child { border-bottom: none; }
.composition-label {
  color: var(--ink-mute);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.75rem;
}
.composition-value {
  color: var(--ink-2);
  text-align: right;
}

.chart-actions {
  display: flex; gap: 0.75rem; flex-wrap: wrap;
  margin-bottom: 0.5rem;
}
.action-helper {
  font-size: 0.8125rem;
  color: var(--ink-mute);
  margin-bottom: 0.5rem;
}
.expiry-note {
  font-size: 0.8125rem;
  color: var(--ink-mute);
  margin-bottom: 2rem;
}
.expiry-note code {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 0.8em;
  color: var(--ink-3);
  background: var(--surface);
  padding: 0.0625rem 0.25rem;
  border-radius: 3px;
}

/* ---------- Constituent panel ---------- */

.constituents {
  margin: 0 0 1.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.constituents-header {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 1rem;
}
.constituents-header h2 {
  font-size: 1.125rem;
  margin: 0;
}
.btn-text {
  background: none; border: none; padding: 0;
  font: inherit; font-size: 0.875rem; color: var(--link); cursor: pointer;
}
.btn-text:hover { text-decoration: underline; }

.holdings {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
}
.holdings th {
  text-align: left;
  padding: 0.5rem 0.75rem 0.5rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--ink-mute);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.holdings td {
  padding: 0.5rem 0.75rem 0.5rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--ink-2);
  vertical-align: top;
}
.holdings td.ticker {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-weight: 500;
  color: var(--ink);
  width: 5rem;
}
.holdings td.sector {
  color: var(--ink-3);
  font-size: 0.875rem;
}
.holdings td.num, .holdings th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  width: 5rem;
}

.sector-breakdown {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}
.sector-breakdown-title {
  color: var(--ink-mute);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}
.sector-bar {
  display: grid;
  grid-template-columns: 11rem 1fr 4rem;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.375rem;
  font-size: 0.875rem;
}
.sector-bar-label { color: var(--ink-2); }
.sector-bar-track {
  background: var(--surface);
  height: 0.5rem;
  border-radius: 999px;
  overflow: hidden;
}
.sector-bar-fill {
  display: block;
  height: 100%;
  background: var(--ink-mute);
  border-radius: 999px;
}
.sector-bar-value {
  text-align: right;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 540px) {
  .sector-bar { grid-template-columns: 8rem 1fr 3.5rem; gap: 0.5rem; }
  .holdings td.sector { display: none; }
  .holdings th:nth-child(3) { display: none; }
}

.disclaimer {
  font-size: 0.8125rem;
  color: var(--ink-mute);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}
.disclaimer a { color: var(--ink-3); }

.mvp-note {
  font-size: 0.75rem;
  color: var(--ink-mute);
  font-style: italic;
  border-top: 1px dashed var(--border);
  padding-top: 1rem;
}

/* ---------- Mobile ---------- */

@media (max-width: 540px) {
  h1 { font-size: 2rem; }
  main { padding: 2rem 1.25rem 4rem; }
  .options { gap: 0.375rem; }
  .option { padding: 0.5rem 0.75rem; font-size: 0.875rem; }
  .name-field input { font-size: 1.25rem; }
  .index-title { font-size: 1.75rem; }
  .perf-index { font-size: 1.5rem; }
  .chart { height: 320px; }
  .composition { padding: 1rem; }
  .composition-row { flex-direction: column; gap: 0.125rem; }
  .composition-value { text-align: left; }
}