/* Chart the Cost — site styles. Tokens first; components below. */
:root {
  --paper: #F7F4EC;
  --card: #FFFFFF;
  --ink: #16181D;
  --ink-2: #464B55;
  --muted: #6B717C;
  --rule: #DDD7CA;
  --up: #D9480F;          /* price went up */
  --down: #0C8A7B;        /* price went down */
  --marker: #F2C94C;
  --focus: #1F5FD1;
  --head: 'Bricolage Grotesque', 'Arial Black', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, Consolas, monospace;
  --body: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --wrap: 1080px;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #111318; --card: #1A1D24; --ink: #F2EFE7; --ink-2: #C9CBD1; --muted: #9AA0AA;
    --rule: #2C303A; --up: #E8642F; --down: #1FA68F; --marker: #6E5414; --focus: #7AA7FF;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #111318; --card: #1A1D24; --ink: #F2EFE7; --ink-2: #C9CBD1; --muted: #9AA0AA;
  --rule: #2C303A; --up: #E8642F; --down: #1FA68F; --marker: #6E5414; --focus: #7AA7FF;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 500 17px/1.6 var(--body); }
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration-thickness: 2px; text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--up); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.hl { background: linear-gradient(transparent 58%, var(--marker) 58%, var(--marker) 92%, transparent 92%); padding: 0 .12em; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; background: var(--card); padding: 8px 12px; z-index: 10; }

/* Header */
.site-head { border-bottom: 1px solid var(--rule); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 800 21px/1 var(--head); letter-spacing: -.3px; }
.brand svg { width: 34px; height: 34px; }
.brand .cost { color: var(--up); }
.nav { display: flex; gap: 18px; align-items: center; font-weight: 600; font-size: 15px; }
.nav a { text-decoration: none; }
.nav a[aria-current="page"] { text-decoration: underline; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 18px; border-radius: 999px; border: 2px solid var(--ink);
  font: 700 15px/1 var(--body); text-decoration: none; cursor: pointer; background: transparent; color: var(--ink); }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn:hover { transform: translateY(-1px); }

/* Type */
h1, h2, h3 { font-family: var(--head); font-weight: 800; letter-spacing: -.5px; line-height: 1.08; margin: 0 0 .4em; }
h1 { font-size: clamp(38px, 7vw, 72px); }
h2 { font-size: clamp(28px, 4.2vw, 42px); }
h3 { font-size: 22px; }
.eyebrow { font: 700 13px/1 var(--mono); letter-spacing: 2px; text-transform: uppercase; display: inline-block;
  border: 2px solid var(--ink); padding: 6px 10px; margin-bottom: 18px; }
.lede { font-size: clamp(18px, 2.2vw, 21px); color: var(--ink-2); max-width: 46ch; }

/* Sections */
section { padding: 56px 0; }
section + section { border-top: 1px solid var(--rule); }
.hero { padding: 64px 0 48px; }
.hero .ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); padding: 20px; }
.card h3 { margin-bottom: 6px; }
.card p { margin: 0; color: var(--ink-2); font-size: 15px; }
.card .tag { font: 700 12px/1 var(--mono); letter-spacing: 1.5px; color: var(--muted); text-transform: uppercase; margin-bottom: 10px; display: block; }

/* Receipt panel */
.receipt { background: var(--card); padding: 24px 22px 34px; border-radius: 6px 6px 0 0; position: relative;
  -webkit-mask: linear-gradient(#000 0 0) top / 100% calc(100% - 12px) no-repeat, conic-gradient(from -45deg at bottom, #0000, #000 1deg 89deg, #0000 90deg) bottom / 24px 12px repeat-x;
  mask: linear-gradient(#000 0 0) top / 100% calc(100% - 12px) no-repeat, conic-gradient(from -45deg at bottom, #0000, #000 1deg 89deg, #0000 90deg) bottom / 24px 12px repeat-x; }
.receipt-title { font: 700 14px/1 var(--mono); letter-spacing: 3px; text-align: center; margin-bottom: 4px; }
.receipt-sub { font: 500 13px/1.4 var(--mono); color: var(--muted); text-align: center; margin-bottom: 18px; }

/* Diverging bar chart (built by chart.js) */
.chart { position: relative; }
.chart-row { display: grid; grid-template-columns: minmax(110px, 30%) 1fr; align-items: center; gap: 12px; padding: 5px 0; }
.chart-row .lab { font-size: 15px; font-weight: 600; }
.chart-row .lab small { display: block; font-weight: 500; color: var(--muted); font-size: 12px; }
.track { position: relative; height: 28px; }
.track .zero { position: absolute; top: -5px; bottom: -5px; width: 1px; background: var(--ink-2); }
.track .bar { position: absolute; top: 5px; height: 18px; }
.track .bar.up { background: var(--up); border-radius: 0 4px 4px 0; }
.track .bar.down { background: var(--down); border-radius: 4px 0 0 4px; }
.track .bar.base { background: var(--ink-2); border-radius: 0 4px 4px 0; }
.track .val { position: absolute; top: 50%; transform: translateY(-50%); font: 700 14px/1 var(--mono); color: var(--ink); white-space: nowrap; }
.chart-row:hover .bar, .chart-row:focus-within .bar { filter: brightness(1.08); }
.chart-row:hover { background: color-mix(in srgb, var(--rule) 35%, transparent); border-radius: 6px; }
.chart-legend { display: flex; gap: 18px; flex-wrap: wrap; font-size: 13px; color: var(--ink-2); margin: 14px 0 0; }
.chart-legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.tip { position: fixed; pointer-events: none; background: var(--ink); color: var(--paper); font: 600 13px/1.45 var(--body);
  padding: 8px 10px; border-radius: 6px; max-width: 260px; z-index: 20; opacity: 0; transition: opacity .1s; }
.tip.on { opacity: 1; }
.source-line { font: 500 12.5px/1.5 var(--mono); color: var(--muted); border-top: 1px dashed var(--muted); padding-top: 10px; margin-top: 16px; }
details.table-view { margin-top: 12px; font-size: 14px; }
details.table-view summary { cursor: pointer; font-weight: 600; }
table { border-collapse: collapse; width: 100%; margin-top: 10px; font-size: 14px; }
th, td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--rule); }
td.num, th.num { text-align: right; font-family: var(--mono); }

/* Calculator */
.calc { display: grid; gap: 24px; grid-template-columns: 1fr; }
@media (min-width: 900px) { .calc { grid-template-columns: 1.05fr 1fr; align-items: start; } .calc .results { position: sticky; top: 16px; } }
.periods { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.periods button { border: 2px solid var(--ink); background: transparent; color: var(--ink); border-radius: 999px; padding: 8px 14px; font: 700 14px/1 var(--body); cursor: pointer; }
.periods button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.inputs { display: grid; gap: 2px; }
.in-row { display: grid; grid-template-columns: 1fr 130px; gap: 12px; align-items: center; padding: 8px 0; border-bottom: 1px dotted var(--rule); }
.in-row label { font-weight: 600; font-size: 15px; }
.in-row label small { display: block; color: var(--muted); font-weight: 500; font-size: 12px; }
.money { position: relative; }
.money::before { content: "$"; position: absolute; left: 10px; top: 50%; transform: translateY(-50%); color: var(--muted); font-family: var(--mono); }
.money input { width: 100%; padding: 9px 10px 9px 22px; border: 1.5px solid var(--rule); border-radius: 8px; background: var(--card); color: var(--ink);
  font: 600 16px/1 var(--mono); text-align: right; }
.money input:focus { border-color: var(--ink); }
.presets { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0 4px; }
.presets button { font: 600 13px/1 var(--body); padding: 8px 12px; border-radius: 8px; border: 1.5px dashed var(--muted); background: transparent; color: var(--ink); cursor: pointer; }
.big-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.stat { background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); padding: 16px; }
.stat .k { font: 700 12px/1.2 var(--mono); letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); }
.stat .v { font: 800 clamp(34px, 6vw, 52px)/1.1 var(--mono); margin-top: 6px; }
.verdict { font-size: 18px; margin: 16px 0; }
.empty { color: var(--muted); font-style: italic; }

/* Newsletter */
.signup { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.signup input { flex: 1 1 240px; padding: 13px 14px; border-radius: 999px; border: 2px solid var(--ink); background: var(--card); color: var(--ink); font: 500 16px/1 var(--body); }
.notice { background: var(--card); border: 1px dashed var(--muted); border-radius: var(--radius); padding: 14px 16px; font-size: 15px; }

/* Socials and links page */
.socials { display: flex; flex-wrap: wrap; gap: 10px; }
.socials a { border: 1.5px solid var(--rule); background: var(--card); padding: 10px 14px; border-radius: 999px; text-decoration: none; font-weight: 600; font-size: 15px; }
.linkpage { max-width: 520px; margin: 0 auto; padding: 40px 16px 64px; text-align: center; }
.linkpage .logo { width: 96px; height: 96px; margin: 0 auto 14px; }
.linkpage a.big { display: block; padding: 16px; margin: 12px 0; border-radius: 14px; border: 2px solid var(--ink); background: var(--card); text-decoration: none; font-weight: 700; }
.linkpage a.big.primary { background: var(--ink); color: var(--paper); }

/* Prose pages */
.prose { max-width: 720px; }
.prose h2 { margin-top: 1.4em; font-size: 28px; }
.prose li { margin: 6px 0; }

/* Video placeholders */
.video { aspect-ratio: 9 / 16; background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); display: grid; place-items: center; text-align: center; padding: 16px; }
.video img { border-radius: 6px; }

/* Footer */
.site-foot { border-top: 1px solid var(--rule); padding: 32px 0 48px; font-size: 14px; color: var(--ink-2); }
.site-foot .row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
.site-foot nav { display: flex; gap: 16px; flex-wrap: wrap; }

@media (max-width: 640px) {
  .nav .hide-sm { display: none; }
  section { padding: 40px 0; }
  .chart-row { grid-template-columns: 96px 1fr; gap: 8px; }
  .in-row { grid-template-columns: 1fr 112px; }
}
@media (prefers-reduced-motion: reduce) { .btn:hover { transform: none; } }