/* =========================================================================
   ALPHA ATTRIBUTION - design system
   Palette and type inspired by CRED (cred.club): pure black ground, electric
   blue #0000EE accent, display serif + geometric sans + mono for figures.
   Gilroy and Denton are commercial faces, so the closest free equivalents
   are used: Outfit (for Gilroy) and Instrument Serif (for Denton).
   Overpass Mono is what CRED actually ships, and it is free.
   ========================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Outfit:wght@200;300;400;500;600;700&family=Overpass+Mono:wght@300;400;600;700&display=swap');

:root {
  /* ground - pure white */
  --bg:           #FFFFFF;
  --surface:      #FAFAFA;
  --surface-2:    #F4F4F6;
  --surface-3:    #EDEDF0;

  /* ink */
  --ink:          #000000;
  --text:         rgba(0,0,0,0.92);
  --text-dim:     rgba(0,0,0,0.62);   /* 6.20:1 on white */
  --text-faint:   rgba(0,0,0,0.56);   /* 4.94:1 on white - AA */

  /* lines */
  --line:         rgba(0,0,0,0.10);
  --line-mid:     rgba(0,0,0,0.18);
  --line-strong:  rgba(0,0,0,0.34);

  /* accent - CRED electric blue, used at full strength now that the ground
     is white and it no longer needs lightening to stay legible */
  --blue:         #0000EE;
  --blue-glow:    rgba(0,0,238,0.22);

  /* data semantics - darkened so they hold contrast against white */
  --pos:          #00875A;
  --pos-dim:      rgba(0,135,90,0.10);
  --neg:          #D91F35;
  --neg-dim:      rgba(217,31,53,0.10);

  /* type */
  --font-display: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --font-ui:      'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, sans-serif;
  --font-mono:    'Overpass Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  /* motion - the easing curves award sites lean on */
  --ease-out-expo:  cubic-bezier(0.16, 1, 0.30, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.50, 1);
  --ease-in-out:    cubic-bezier(0.76, 0, 0.24, 1);

  --gutter: clamp(20px, 5vw, 90px);
  --maxw: 1440px;
}

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

html {
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-ui);
  font-weight: 300;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  overflow-x: hidden;
  font-size: 16px;
}

/* The lerp scroller translates this wrapper; body height mirrors its height. */
#scroll-content { will-change: transform; }

img, svg { display: block; max-width: 100%; }
button, input, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--blue); color: #fff; }

/* --------------------------- film grain overlay -------------------------- */
/* A fixed, very low-opacity turbulence layer. Reads as texture, not noise. */
/* Kept only marginally larger than the viewport. An inset of -120% would make
   this a ~4400x2400 composited layer repainting forever, which is both wasteful
   and enough to stall the compositor. -6% gives the shift room to move without
   exposing an edge. */
.grain {
  position: fixed; inset: -6%;
  z-index: 9998; pointer-events: none;
  opacity: 0.055;
  mix-blend-mode: multiply;   /* on white the grain must darken, not lighten */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain-shift 800ms steps(3) infinite;
}
@keyframes grain-shift {
  0%   { transform: translate3d(0,0,0); }
  33%  { transform: translate3d(-2%, 1%, 0); }
  66%  { transform: translate3d(1%, -2%, 0); }
  100% { transform: translate3d(0,0,0); }
}

/* ----------------------------- custom cursor ----------------------------- */
.cursor-dot, .cursor-ring {
  position: fixed; top: 0; left: 0;
  z-index: 9999; pointer-events: none;
  border-radius: 50%;
}
.cursor-dot  { width: 6px; height: 6px; background: var(--ink); margin: -3px 0 0 -3px; }
.cursor-ring {
  width: 38px; height: 38px; margin: -19px 0 0 -19px;
  border: 1px solid rgba(0,0,0,0.42);
  transition: width .35s var(--ease-out-expo), height .35s var(--ease-out-expo),
              margin .35s var(--ease-out-expo), border-color .35s var(--ease-out-expo),
              opacity .3s ease;
}
.cursor-ring.is-hover {
  width: 68px; height: 68px; margin: -34px 0 0 -34px;
  border-color: var(--blue);
}
@media (hover: none), (pointer: coarse) {
  .cursor-dot, .cursor-ring { display: none; }
}

/* ------------------------------ typography ------------------------------- */
.display {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 0.92;
  letter-spacing: -0.025em;
}
h1.display { font-size: clamp(3rem, 11.5vw, 12rem); }
h2.display { font-size: clamp(2.4rem, 6.4vw, 6rem); }
h3.display { font-size: clamp(1.7rem, 3.2vw, 3rem); }
.italic { font-style: italic; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px; font-weight: 400;
  letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--text-faint);
}
.lede { font-size: clamp(1.05rem, 1.55vw, 1.4rem); color: var(--text-dim); max-width: 62ch; font-weight: 300; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.accent { color: var(--blue); }
.pos { color: var(--pos); }
.neg { color: var(--neg); }

/* -------------------------------- layout --------------------------------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
section { position: relative; }
/* Vertical only. Using the `padding` shorthand here would reset the
   horizontal gutter that .wrap sets on the same element. */
.section-pad { padding-top: clamp(90px, 13vh, 190px); padding-bottom: clamp(90px, 13vh, 190px); }
.rule { height: 1px; background: var(--line); width: 100%; }

.section-head { display: flex; align-items: baseline; gap: 18px; margin-bottom: 14px; }
.section-num {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--blue); letter-spacing: 0.1em;
}

/* --------------------------------- nav ----------------------------------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px var(--gutter);
  /* No difference blending here. On a white ground it would invert dark text
     to white and make the nav disappear. */
  color: var(--text);
  background: linear-gradient(to bottom, rgba(255,255,255,0.92), rgba(255,255,255,0));
  backdrop-filter: blur(6px);
}
.nav-mark { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.2em; text-transform: uppercase; }
.nav-links { display: flex; gap: 30px; }
.nav-link {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.16em; text-transform: uppercase;
  position: relative; padding-bottom: 3px; color: rgba(0,0,0,0.55);
  transition: color .3s ease;
}
.nav-link::after {
  content: ''; position: absolute; left: 0; bottom: 0; height: 1px; width: 100%;
  background: currentColor; transform: scaleX(0); transform-origin: right;
  transition: transform .5s var(--ease-out-expo);
}
.nav-link:hover { color: var(--ink); }
.nav-link:hover::after { transform: scaleX(1); transform-origin: left; }
@media (max-width: 720px) { .nav-links { display: none; } }

/* -------------------------------- hero ----------------------------------- */
.hero { min-height: 100svh; display: flex; flex-direction: column; justify-content: center; padding-top: 80px; }
/* Block so the mask actually clips, and so each line breaks on its own.
   The padding/negative-margin pair gives descenders room inside the mask
   without adding visible space between the lines. */
.hero-line {
  display: block; overflow: hidden;
  padding-bottom: 0.14em; margin-bottom: -0.14em;
}
/* Each character sits in that mask and rises into place. */
.char { display: inline-block; will-change: transform; }
.hero-meta {
  display: flex; flex-wrap: wrap; gap: 40px;
  margin-top: clamp(40px, 6vh, 80px); padding-top: 28px; border-top: 1px solid var(--line);
}
.hero-meta-item { min-width: 130px; }
.hero-meta-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--text-faint); margin-bottom: 8px; }
.hero-meta-value { font-size: 1rem; color: var(--text); }

.scroll-cue {
  position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.scroll-cue-line { width: 1px; height: 46px; background: linear-gradient(to bottom, transparent, var(--line-strong)); position: relative; overflow: hidden; }
.scroll-cue-line::after {
  content: ''; position: absolute; top: -46px; left: 0; width: 1px; height: 46px;
  background: linear-gradient(to bottom, transparent, var(--blue));
  animation: cue 2.1s var(--ease-in-out) infinite;
}
@keyframes cue { 0% { top: -46px; } 60%,100% { top: 46px; } }

/* ------------------------------- ticker ---------------------------------- */
.ticker {
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  padding: 18px 0; overflow: hidden; white-space: nowrap;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
          mask-image: linear-gradient(to right, transparent, #000 8%, #000 92%, transparent);
}
.ticker-track { display: inline-flex; gap: 56px; will-change: transform; }
.ticker-item {
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.06em;
  display: inline-flex; align-items: center; gap: 12px; color: var(--text-dim);
}
.ticker-item b { color: var(--text); font-weight: 400; }

/* ------------------------------- surfaces -------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: clamp(20px, 2.6vw, 34px);
  position: relative;
}
.card-quiet { background: transparent; }

/* ------------------------------- controls -------------------------------- */
.controls { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.pill {
  position: relative; overflow: hidden; isolation: isolate;
  border: 1px solid var(--line-mid); border-radius: 999px;
  padding: 11px 22px;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-dim);
  transition: color .4s var(--ease-out-expo), border-color .4s var(--ease-out-expo);
  will-change: transform;
}
/* Fill sweeps up from the bottom on hover. */
.pill::before {
  content: ''; position: absolute; inset: 0; background: var(--ink);
  transform: translateY(101%); transition: transform .55s var(--ease-out-expo); z-index: -1;
}
.pill span { position: relative; z-index: 1; }
.pill:hover { color: var(--bg); border-color: var(--ink); }
.pill:hover::before { transform: translateY(0); }
.pill[aria-pressed="true"] { color: var(--bg); border-color: var(--ink); }
.pill[aria-pressed="true"]::before { transform: translateY(0); }

.select-wrap { position: relative; display: inline-block; }
.select-wrap::after {
  content: ''; position: absolute; right: 16px; top: 50%; width: 6px; height: 6px;
  border-right: 1px solid var(--text-dim); border-bottom: 1px solid var(--text-dim);
  transform: translateY(-70%) rotate(45deg); pointer-events: none;
}
select {
  appearance: none; -webkit-appearance: none;
  background: var(--surface-2); border: 1px solid var(--line-mid); border-radius: 3px;
  padding: 13px 46px 13px 17px; cursor: pointer;
  font-family: var(--font-ui); font-size: 15px; font-weight: 300;
  transition: border-color .35s ease, background .35s ease;
}
select:hover { border-color: var(--line-strong); background: var(--surface-3); }
select:focus-visible { outline: 1px solid var(--blue); outline-offset: 2px; }

/* -------------------------------- metrics -------------------------------- */
.metrics {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(165px, 1fr));
  border-top: 1px solid var(--line);
}
.metric {
  padding: 26px 24px 26px 0; border-right: 1px solid var(--line);
  position: relative;
}
.metric:last-child { border-right: 0; }
.metric-label {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--text-faint); margin-bottom: 12px;
}
.metric-value {
  font-family: var(--font-mono); font-size: clamp(1.5rem, 2.6vw, 2.3rem);
  font-weight: 300; letter-spacing: -0.02em; font-variant-numeric: tabular-nums;
}
.metric-delta { font-family: var(--font-mono); font-size: 11px; margin-top: 7px; color: var(--text-faint); }
@media (max-width: 640px) { .metric { border-right: 0; border-bottom: 1px solid var(--line); padding-right: 0; } }

/* -------------------------------- table ---------------------------------- */
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 13px; }
thead th {
  text-align: right; padding: 12px 14px; font-weight: 400; font-size: 10px;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-faint);
  border-bottom: 1px solid var(--line-mid); white-space: nowrap;
}
thead th:first-child, tbody td:first-child { text-align: left; }
tbody td {
  text-align: right; padding: 14px; border-bottom: 1px solid var(--line);
  font-variant-numeric: tabular-nums; white-space: nowrap;
  transition: background .3s ease;
}
tbody tr:hover td { background: rgba(0,0,0,0.028); }
tbody td:first-child { font-family: var(--font-ui); font-size: 14px; }

/* -------------------------------- charts --------------------------------- */
.chart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(16px, 2vw, 30px); }
@media (max-width: 900px) { .chart-grid { grid-template-columns: 1fr; } }
.chart-title { font-size: 14px; color: var(--text); margin-bottom: 3px; }
.chart-sub { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-faint); margin-bottom: 20px; }
.chart svg { width: 100%; height: auto; overflow: visible; }
.bar { transform-box: fill-box; transform-origin: bottom center; }
.bar.is-neg { transform-origin: top center; }
.axis-label { font-family: var(--font-mono); font-size: 9.5px; fill: rgba(0,0,0,0.56); letter-spacing: 0.06em; }
.grid-line { stroke: rgba(0,0,0,0.10); stroke-width: 1; }
.zero-line { stroke: rgba(0,0,0,0.38); stroke-width: 1; }
.legend { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 16px; }
.legend-item { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-dim); }
.swatch { width: 9px; height: 9px; border-radius: 1px; }
.note {
  font-size: 13px; color: var(--text-dim); margin-top: 16px;
  padding-left: 14px; border-left: 1px solid var(--line-mid); line-height: 1.6;
}
.note b { color: var(--text); font-weight: 400; }

/* ------------------------------- sliders --------------------------------- */
.slider-row { display: grid; grid-template-columns: 148px 1fr 62px; gap: 18px; align-items: center; padding: 15px 0; border-bottom: 1px solid var(--line); }
@media (max-width: 560px) { .slider-row { grid-template-columns: 100px 1fr 52px; gap: 10px; } }
.slider-name { font-size: 14px; color: var(--text-dim); }
.slider-val { font-family: var(--font-mono); font-size: 14px; text-align: right; font-variant-numeric: tabular-nums; }
input[type=range] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 22px;
  background: transparent; cursor: grab;
}
input[type=range]:active { cursor: grabbing; }
input[type=range]::-webkit-slider-runnable-track { height: 1px; background: rgba(0,0,0,0.18); }
input[type=range]::-moz-range-track { height: 1px; background: rgba(0,0,0,0.18); }
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 13px; height: 13px; border-radius: 50%;
  background: var(--ink); margin-top: -6px;
  transition: transform .3s var(--ease-out-expo), box-shadow .3s ease;
}
input[type=range]::-moz-range-thumb {
  width: 13px; height: 13px; border: 0; border-radius: 50%; background: var(--ink);
  transition: transform .3s var(--ease-out-expo), box-shadow .3s ease;
}
input[type=range]:hover::-webkit-slider-thumb { transform: scale(1.5); box-shadow: 0 0 0 7px var(--blue-glow); }
input[type=range]:hover::-moz-range-thumb    { transform: scale(1.5); box-shadow: 0 0 0 7px var(--blue-glow); }
input[type=range]:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 7px var(--blue-glow); }

.status {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 12px 16px; border-radius: 3px; margin-top: 18px;
  border: 1px solid var(--line-mid);
}
.status.ok   { color: var(--pos); border-color: rgba(0,135,90,0.35); background: var(--pos-dim); }
.status.warn { color: var(--neg); border-color: rgba(217,31,53,0.35); background: var(--neg-dim); }

/* ------------------------------- verdict --------------------------------- */
.verdict {
  border-left: 2px solid var(--blue);
  padding: 26px 30px; background: linear-gradient(90deg, rgba(0,0,238,0.05), transparent 70%);
  font-size: clamp(1rem, 1.25vw, 1.16rem); line-height: 1.72; color: var(--text);
  font-weight: 300;
}

/* ------------------------------- formula --------------------------------- */
.formula {
  font-family: var(--font-mono); font-size: clamp(0.85rem, 1.5vw, 1.2rem);
  padding: 30px 0; border-bottom: 1px solid var(--line);
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px;
}
.formula-name { color: var(--text-faint); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; min-width: 130px; }
.formula-body { color: var(--text); }
.formula-body em { color: var(--blue); font-style: normal; }

/* -------------------------------- footer --------------------------------- */
.footer { padding-top: 90px; padding-bottom: 50px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 40px; }
.footer small { display: block; font-family: var(--font-mono); font-size: 11px; color: var(--text-faint); line-height: 1.9; }

/* --------------------------- reveal base states --------------------------- */
/* Only applied once JS is confirmed running, so content stays visible if the
   script fails to load. GSAP animates these to their resting state. */
html.js-ready [data-reveal] { opacity: 0; }
html.js-ready .char { transform: translateY(105%); }

@media (prefers-reduced-motion: reduce) {
  html.js-ready [data-reveal], html.js-ready .char { opacity: 1 !important; transform: none !important; }
  .grain { animation: none; }
  .scroll-cue-line::after { animation: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}