/* Purrtfolio — locked design (prototype approved 2026-10-24).
   IBM Plex Sans for text, IBM Plex Mono for numbers; near-black on cool grey;
   red only for verdicts. */
:root {
  --ink: #0E1116;
  --ink-2: #3A4150;
  --ink-3: #4A5160;
  --ground: #F4F5F7;
  --card: #FFFFFF;
  --line: #D9DCE1;
  --line-2: #E6E8EC;
  --field: #9AA1AD;
  --accent: #C8312F;
  --blue: #1F4FD1;
  --purple: #6B3FA0;
  --light-blue: #9DB4F2;
  --on-dark: #C9CED6;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--ground); color: var(--ink); font-family: var(--sans); }
a { color: var(--ink); }
a:hover { color: var(--ink-2); }
h1, h2, h3 { letter-spacing: -0.02em; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 920px; }
.mono { font-family: var(--mono); }
.eyebrow { margin: 0 0 16px; font-family: var(--mono); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
.muted { color: var(--ink-3); }
.lede { color: var(--ink-2); font-size: 18px; line-height: 1.55; max-width: 720px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff; padding: 10px 14px; border-radius: 6px; z-index: 10; }
.skip:focus { left: 16px; }

/* header */
.site-header { border-bottom: 1px solid var(--line); background: var(--card); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; min-height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand span { font-weight: 700; font-size: 20px; letter-spacing: -0.02em; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 22px; align-items: center; }
.nav a { text-decoration: none; color: var(--ink-2); font-size: 15px; padding: 12px 4px; min-height: 44px; display: inline-flex; align-items: center; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav a[aria-current="page"] { font-weight: 600; }
.nav a.nav-cta { color: #fff; background: var(--ink); padding: 0 16px; border-radius: 6px; }

/* buttons */
.btn { display: inline-flex; align-items: center; min-height: 48px; padding: 0 22px; border-radius: 6px; font-weight: 600; font-size: 16px; text-decoration: none; border: 1.5px solid var(--ink); font-family: inherit; cursor: pointer; }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { color: #fff; background: #262b33; }
.btn-light { background: transparent; color: var(--ink); }
.btn-white { background: #fff; color: var(--ink); border-color: #fff; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }

/* home */
.hero { padding: 88px 24px 64px; }
.hero h1 { margin: 0; max-width: 900px; font-size: 64px; line-height: 1.04; letter-spacing: -0.03em; font-weight: 700; }
.hero .lede { margin: 28px 0 0; font-size: 19px; max-width: 680px; }
.band { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--card); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 28px; padding-top: 36px; padding-bottom: 36px; }
.stat { display: flex; flex-direction: column; gap: 6px; }
.stat b { font-family: var(--mono); font-size: 40px; font-weight: 600; letter-spacing: -0.02em; }
.stat span { font-size: 15px; color: var(--ink-3); }
.section { padding: 72px 24px 24px; }
.section > h2, .section-head h2 { margin: 0; font-size: 32px; }
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 28px; }
.section-intro { margin: 10px 0 28px; max-width: 640px; font-size: 17px; line-height: 1.55; color: var(--ink-2); }
.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-sm { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 26px; display: flex; flex-direction: column; gap: 14px; }
a.card { text-decoration: none; color: inherit; }
a.card:hover { border-color: var(--ink); color: inherit; }
.card h3 { margin: 0; font-size: 21px; line-height: 1.3; }
.card p { margin: 0; font-size: 15px; line-height: 1.5; color: var(--ink-2); }
.card .foot { margin-top: auto; font-size: 14px; color: var(--ink-3); }
.card-top { display: flex; justify-content: space-between; gap: 8px; align-items: center; flex-wrap: wrap; }
.kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); }
.badge { font-family: var(--mono); font-size: 12px; font-weight: 600; border: 1.5px solid currentColor; padding: 3px 8px; border-radius: 4px; text-transform: uppercase; }
.tool h3 { font-size: 18px; }
.soon { font-family: var(--mono); font-size: 12px; color: var(--ink-3); margin-top: auto; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--card); }
.tiles > div { padding: 24px; border-right: 1px solid var(--line-2); border-bottom: 1px solid var(--line-2); display: flex; flex-direction: column; gap: 6px; }
.tiles h3 { margin: 0; font-size: 17px; }
.tiles p { margin: 0; font-size: 15px; line-height: 1.5; color: var(--ink-2); }
.steps { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 28px; }
.steps li { display: flex; flex-direction: column; gap: 8px; border-top: 2px solid var(--ink); padding-top: 16px; }
.steps h3 { margin: 0; font-size: 18px; }
.steps p { margin: 0; font-size: 15px; line-height: 1.5; color: var(--ink-2); }
.offer { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; }
.offer > div { border-radius: 12px; padding: 36px; display: flex; flex-direction: column; gap: 14px; }
.offer h2 { margin: 0; font-size: 28px; }
.offer p { margin: 0; font-size: 16px; line-height: 1.55; }
.how { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 6px; color: var(--on-dark); font-size: 15px; line-height: 1.5; }
.dark { background: var(--ink); color: #fff; }
.dark p { color: var(--on-dark); }
.light { background: var(--card); border: 1px solid var(--line); }
.light p { color: var(--ink-2); }
.signup { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }
.signup input { flex: 1 1 220px; min-height: 48px; padding: 0 14px; border: 1.5px solid var(--field); border-radius: 6px; font: inherit; font-size: 16px; }
.site-footer { border-top: 1px solid var(--line); background: var(--card); margin-top: 88px; }
.site-footer .wrap { padding-top: 32px; padding-bottom: 32px; display: flex; flex-direction: column; gap: 10px; }
.site-footer p { margin: 0; font-size: 13px; line-height: 1.6; color: var(--ink-3); max-width: 860px; }
.site-footer strong { color: var(--ink); }

/* graveyard */
.page-head { padding: 64px 24px 8px; }
.page-head h1 { margin: 0; font-size: 52px; line-height: 1.06; letter-spacing: -0.03em; }
.page-head .lede { margin: 20px 0 0; }
.filters { padding: 32px 24px 8px; display: flex; flex-direction: column; gap: 16px; }
.search { display: flex; flex-direction: column; gap: 6px; max-width: 460px; }
.search label { font-size: 14px; font-weight: 500; color: var(--ink-2); }
.search input { min-height: 48px; padding: 0 14px; border: 1.5px solid var(--field); border-radius: 6px; background: #fff; font: inherit; font-size: 16px; color: var(--ink); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { min-height: 44px; padding: 0 16px; border-radius: 999px; border: 1.5px solid #C3C8D0; background: #fff; color: var(--ink); font: inherit; font-size: 15px; font-weight: 500; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; }
.chip[aria-pressed="true"] { background: var(--ink); color: #fff; border-color: var(--ink); }
.chip .n { font-family: var(--mono); font-size: 13px; opacity: 0.8; }
.count { margin: 0; font-size: 14px; color: var(--ink-3); }
.studies { padding: 8px 24px 0; display: flex; flex-direction: column; gap: 14px; }
.row { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 24px 26px; display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px 32px; align-items: start; }
.row[hidden] { display: none; }
.row > div { display: flex; flex-direction: column; gap: 10px; }
.row h2 { margin: 0; font-size: 19px; line-height: 1.35; font-weight: 600; letter-spacing: -0.01em; }
.row p { margin: 0; font-size: 16px; line-height: 1.5; }
.row-foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; align-items: center; }
.row-foot a { font-size: 15px; font-weight: 600; min-height: 44px; display: inline-flex; align-items: center; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.empty { margin: 0; padding: 40px 0; font-size: 16px; color: var(--ink-2); }

/* study */
.study { padding: 48px 24px 0; display: flex; flex-direction: column; gap: 48px; }
.study-head { display: flex; flex-direction: column; gap: 18px; }
.crumb { font-size: 14px; color: var(--ink-3); }
.verdict { font-family: var(--mono); font-size: 13px; font-weight: 600; color: #fff; background: var(--accent); padding: 5px 10px; border-radius: 4px; }
.study h1 { margin: 0; font-size: 46px; line-height: 1.1; letter-spacing: -0.03em; }
.summary { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 24px 26px; display: flex; flex-direction: column; gap: 8px; }
.summary p { margin: 0; font-size: 20px; line-height: 1.5; font-weight: 500; }
.block { display: flex; flex-direction: column; gap: 16px; }
.block h2 { margin: 0; font-size: 26px; }
.block > p { margin: 0; font-size: 16px; line-height: 1.6; color: var(--ink-2); }
.table-box { overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: 10px; }
.tbl { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 520px; }
.tbl th, .tbl td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line-2); vertical-align: top; }
.tbl thead th { font-weight: 600; color: var(--ink-2); font-size: 13px; letter-spacing: 0.04em; text-transform: uppercase; }
.tbl tbody th { font-weight: 600; }
.tbl td { font-family: var(--mono); }
.figure { margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 28px 26px 20px; }
.figure figcaption { margin-top: 12px; font-size: 13px; color: var(--ink-3); }
.strip { position: relative; height: 150px; }
.strip .axis { position: absolute; left: 0; right: 0; top: 70px; height: 1px; background: var(--field); }
.strip .mark { position: absolute; top: 34px; height: 72px; }
.strip .mark-zero { width: 1px; background: var(--ink); }
.strip .mark-cost { border-left: 2px dashed var(--purple); }
.strip .mark-need { width: 2px; background: var(--accent); }
.strip .dot { position: absolute; width: 12px; height: 12px; margin-left: -6px; border-radius: 50%; background: var(--blue); border: 1.5px solid #fff; }
.strip .lbl { position: absolute; transform: translateX(-50%); font-family: var(--mono); font-size: 12px; white-space: nowrap; }
.strip .lbl-zero { top: 112px; color: var(--ink); }
.strip .lbl-cost { top: 0; color: var(--purple); }
.strip .lbl-need { top: 112px; color: var(--accent); }
.strip .lbl-points { top: 0; transform: translateX(-30%); color: var(--blue); }
.disclosure { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 0 20px; }
.disclosure summary { min-height: 48px; display: flex; align-items: center; cursor: pointer; font-weight: 500; }
.disclosure .table-box { border: 0; margin-bottom: 16px; }
.bars { display: flex; flex-direction: column; gap: 12px; }
.bar-row { display: grid; grid-template-columns: 64px minmax(0, 1fr) 150px; gap: 12px; align-items: center; }
.bar-track { position: relative; height: 28px; background: var(--ground); border-radius: 4px; }
.bar-zero { position: absolute; top: 0; bottom: 0; width: 1px; background: var(--ink); }
.bar-a { position: absolute; top: 4px; height: 8px; background: var(--light-blue); border-radius: 2px; }
.bar-b { position: absolute; top: 15px; height: 9px; background: var(--accent); border-radius: 2px; }
.checks { margin: 0; padding: 0; list-style: none; background: var(--card); border: 1px solid var(--line); border-radius: 10px; }
.checks li { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 14px; padding: 16px 20px; border-bottom: 1px solid var(--line-2); align-items: start; }
.checks li:last-child { border-bottom: 0; }
.checks .res { font-family: var(--mono); font-size: 12px; font-weight: 600; display: inline-flex; align-items: center; gap: 6px; }
.checks .fail { color: var(--accent); }
.checks .pass { color: #0E6B5C; }
.checks b { display: block; font-size: 16px; margin-bottom: 4px; }
.checks span.d { font-size: 15px; line-height: 1.5; color: var(--ink-2); }
.pair { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.pair > div { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 24px; display: flex; flex-direction: column; gap: 10px; }
.pair h2 { margin: 0; font-size: 20px; }
.pair p, .pair ul { margin: 0; font-size: 15px; line-height: 1.6; color: var(--ink-2); }
.pair ul { padding-left: 20px; display: flex; flex-direction: column; gap: 6px; }
.details { margin: 0 0 20px; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px 28px; font-size: 15px; }
.details dt { color: var(--ink-3); font-size: 13px; }
.details dd { margin: 4px 0 0; }
.cta { border-radius: 12px; padding: 32px; display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: center; justify-content: space-between; }
.cta > div { display: flex; flex-direction: column; gap: 6px; flex: 1 1 380px; }
.cta h2 { margin: 0; font-size: 24px; }
.cta p { margin: 0; font-size: 16px; line-height: 1.5; }

@media (max-width: 720px) {
  .hero { padding-top: 56px; }
  .hero h1 { font-size: 40px; }
  .stat b { font-size: 30px; }
  .page-head h1 { font-size: 38px; }
  .study h1 { font-size: 34px; }
  .bar-row { grid-template-columns: 48px minmax(0, 1fr); }
  .bar-row .mono { grid-column: 1 / -1; }
}