/* ==========================================================================
   HAPPYNOMICS — design system v3
   Modern, minimal, story-driven. Constellation identity.
   Type: Montserrat (headings) · Exo (text)
   Grounds: deep-space navy ↔ clean white. Accents from the mark.
   Shadows: soft only.
   ========================================================================== */

:root {
  --space: #070f1e;
  --space-2: #0a1626;
  --glass: rgba(255, 255, 255, 0.035);
  --glass-2: rgba(255, 255, 255, 0.06);
  --stroke-d: rgba(148, 184, 216, 0.16);
  --white: #f7f9fc;
  --card: #ffffff;
  --stroke-l: #e4eaf2;
  --sky: #35a7e8;
  --sky-deep: #1e7fc2;
  --orange: #f2662e;
  --amber: #f5af2d;
  --ink: #101d30;
  --body-l: #45566b;
  --muted-l: #71829a;
  --body-d: #b9cde0;
  --muted-d: #7c93ab;
  --grad: linear-gradient(92deg, var(--sky), var(--amber));
  --grad-soft: linear-gradient(92deg, rgba(53, 167, 232, 0.14), rgba(245, 175, 45, 0.14));
  --mont: "Montserrat", "Avenir Next", -apple-system, "Segoe UI", sans-serif;
  --exo: "Exo", "Avenir Next", -apple-system, "Segoe UI", sans-serif;
  --r: 18px;
  --sh: 0 6px 24px rgba(10, 22, 38, 0.07);
  --sh-d: 0 10px 32px rgba(2, 8, 18, 0.28);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--exo);
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--body-l);
  background: var(--space);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--sky-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 28px; }

h1, h2, h3, h4 { font-family: var(--mont); color: var(--ink); letter-spacing: -0.015em; }

/* gradient text utility */
.gx {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  /* guard descenders (g, y, p, ?) from being clipped by the text-box */
  padding-bottom: 0.08em;
  margin-bottom: -0.08em;
}

/* ---------- chapters & headings ---------- */
.chapter { display: flex; align-items: center; gap: 18px; margin-bottom: 26px; }
.chapter .no {
  font: 800 15px/1 var(--mont);
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  letter-spacing: 0.06em;
}
.chapter .lbl {
  font: 700 12px/1 var(--mont); letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--muted-l);
}
.dark .chapter .lbl { color: var(--muted-d); }
.chapter .rule { flex: 1; height: 1px; background: linear-gradient(90deg, var(--stroke-l), transparent); }
.dark .chapter .rule { background: linear-gradient(90deg, var(--stroke-d), transparent); }

h2.display {
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.12;
  text-wrap: balance;
  margin-bottom: 20px;
  max-width: 22ch;
}
.dark h2.display, .dark h3 { color: #fff; }
.lede { font-size: 18.5px; max-width: 60ch; }
.dark .lede, .dark p { color: var(--body-d); }

section { padding: 104px 0; }
.dark { background: var(--space); }
.dark.tint { background: var(--space-2); }
.light { background: var(--white); }

/* ---------- reveal ---------- */
.rev { opacity: 0; transform: translateY(26px); transition: opacity 0.75s cubic-bezier(.2,.6,.2,1), transform 0.75s cubic-bezier(.2,.6,.2,1); }
.rev.in { opacity: 1; transform: none; }
.stagger > * { transition-delay: calc(var(--i, 0) * 90ms); }
@media (prefers-reduced-motion: reduce) { .rev { opacity: 1; transform: none; transition: none; } }

/* ==========================================================================
   NAV — animated
   ========================================================================== */
header.site { position: fixed; inset: 0 0 auto 0; z-index: 100; transition: background 0.4s, box-shadow 0.4s, backdrop-filter 0.4s; }
header.site.solid { background: rgba(7, 15, 30, 0.78); backdrop-filter: blur(16px); box-shadow: 0 1px 0 var(--stroke-d); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand:hover { text-decoration: none; }
.brand img { height: 54px; width: auto; transition: transform 0.35s cubic-bezier(.2,.6,.2,1); }
.brand:hover img { transform: rotate(-6deg) scale(1.06); }
.brand .word { font: 700 20px/1 var(--mont); letter-spacing: -0.02em; color: #fff; }
.brand .word b { color: var(--sky); font-weight: 700; }
.nav ul { display: flex; gap: 34px; align-items: center; list-style: none; }
.nav ul a:not(.cta) {
  position: relative; color: var(--body-d); font: 600 14.5px var(--mont); padding: 6px 0;
  transition: color 0.25s;
}
.nav ul a:not(.cta):hover { color: #fff; text-decoration: none; }
.nav ul a:not(.cta)::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 100%;
  background: var(--grad); border-radius: 2px;
  transform: scaleX(0); transform-origin: left; transition: transform 0.3s cubic-bezier(.2,.6,.2,1);
}
.nav ul a:not(.cta):hover::after { transform: scaleX(1); }
.nav .cta {
  background: var(--orange); color: #fff; font: 700 14px var(--mont);
  padding: 11px 22px; border-radius: 999px;
  transition: transform 0.25s, box-shadow 0.25s, background 0.25s;
}
.nav .cta:hover { background: #e2551d; transform: translateY(-1px); box-shadow: 0 8px 22px rgba(242, 102, 46, 0.32); text-decoration: none; }

/* ---------- dropdown menu ---------- */
.nav ul li.has-sub { position: relative; }
.nav ul li.has-sub > a .caret { font-size: 0.7em; opacity: 0.7; margin-left: 3px; }
.nav .sub {
  position: absolute; top: calc(100% + 10px); left: -16px; min-width: 232px;
  background: rgba(9, 17, 32, 0.98); backdrop-filter: blur(18px);
  border: 1px solid var(--stroke-d); border-radius: 14px; padding: 8px;
  list-style: none; display: flex; flex-direction: column; gap: 2px; margin: 0;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity 0.18s, transform 0.18s, visibility 0.18s; z-index: 200;
  box-shadow: 0 22px 50px rgba(0, 0, 0, 0.45);
}
.nav .sub::before { content: ""; position: absolute; top: -12px; left: 0; right: 0; height: 12px; } /* hover bridge */
.nav ul li.has-sub:hover > .sub, .nav ul li.has-sub:focus-within > .sub {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.nav .sub li { width: 100%; }
.nav .sub a { display: block; padding: 10px 14px; border-radius: 9px; font: 600 13.5px var(--mont); color: var(--body-d); white-space: nowrap; }
.nav .sub a::after { display: none !important; }
.nav .sub a:hover { background: rgba(255, 255, 255, 0.07); color: #fff; text-decoration: none; }

/* science-section links to the research reviews */
.science-links { margin-top: 46px; font: 500 16.5px/1.75 var(--exo); color: var(--body-d); max-width: 760px; }
.science-links a { color: var(--sky); font-weight: 600; }

/* ==========================================================================
   HERO — constellation
   ========================================================================== */
.hero { position: relative; overflow: hidden; background: radial-gradient(1100px 640px at 72% 8%, #0e2440 0%, var(--space) 58%); padding: 172px 0 110px; }
#net-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(720px 480px at 26% 42%, rgba(7, 15, 30, 0.62), transparent 70%);
}
.hero .wrap { position: relative; z-index: 2; display: grid; grid-template-columns: 1.12fr 0.88fr; gap: 60px; align-items: center; }
.hero .kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font: 700 11.5px var(--mont); letter-spacing: 0.2em; text-transform: uppercase; color: var(--amber);
  margin-bottom: 22px;
}
.hero .kicker::before { content: ""; width: 26px; height: 1.5px; background: var(--grad); border-radius: 2px; }
.hero h1 {
  font-size: clamp(42px, 5.2vw, 72px); font-weight: 800; line-height: 1.06;
  color: #fff; margin-bottom: 24px; text-wrap: balance;
}
.hero h1 .gx { white-space: nowrap; }
.hero .lede { color: var(--body-d); margin-bottom: 36px; font-size: 18px; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.btn {
  display: inline-block; font: 700 15px var(--mont); padding: 15px 30px; border-radius: 999px;
  cursor: pointer; border: 0; transition: transform 0.25s, box-shadow 0.25s, background 0.25s;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn.primary { background: var(--orange); color: #fff; }
.btn.primary:hover { background: #e2551d; box-shadow: 0 10px 26px rgba(242, 102, 46, 0.32); }
.btn.quiet { background: var(--glass-2); color: #fff; box-shadow: inset 0 0 0 1px var(--stroke-d); backdrop-filter: blur(6px); }
.btn.quiet:hover { box-shadow: inset 0 0 0 1px rgba(160, 200, 235, 0.5); }
.hero .provenance { display: flex; gap: 10px 26px; flex-wrap: wrap; font: 500 13px var(--exo); color: var(--muted-d); }
.hero .provenance span { display: flex; align-items: center; gap: 8px; }
.hero .provenance i { width: 5px; height: 5px; border-radius: 50%; background: var(--amber); flex: none; }

/* --- instant estimate card --- */
.instant {
  position: relative; border-radius: 22px; padding: 30px 30px 26px;
  background: linear-gradient(160deg, rgba(20, 40, 66, 0.6), rgba(10, 22, 38, 0.7));
  backdrop-filter: blur(14px);
  border: 1px solid var(--stroke-d);
}
.instant::before {
  content: ""; position: absolute; inset: -1px; border-radius: 23px; padding: 1px;
  background: linear-gradient(140deg, rgba(53, 167, 232, 0.45), transparent 38%, transparent 62%, rgba(245, 175, 45, 0.4));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  pointer-events: none;
}
.instant .tag { font: 700 11px var(--mont); letter-spacing: 0.2em; text-transform: uppercase; color: var(--amber); margin-bottom: 18px; }
.instant label { display: block; font: 600 12.5px var(--mont); color: var(--body-d); margin: 15px 0 7px; }
.instant select, .instant input[type="number"] {
  width: 100%; padding: 12px 14px; border-radius: 12px; font: 500 15px var(--exo);
  background: rgba(6, 13, 25, 0.72); color: #fff; border: 1px solid var(--stroke-d);
  transition: border-color 0.2s;
}
.instant select:focus, .instant input:focus { outline: none; border-color: var(--sky); }
.instant .grid2i { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.instant .out { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--stroke-d); }
.instant .out .label { font: 700 10.5px var(--mont); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted-d); }
.instant .out .big {
  font: 800 clamp(36px, 3.8vw, 50px)/1.08 var(--mont); font-variant-numeric: tabular-nums;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  margin: 8px 0 4px;
}
.instant .out .sub { font: 500 13px var(--exo); color: var(--muted-d); }
.instant .out .sub b { color: var(--body-d); font-weight: 600; }
.instant .go { display: inline-block; margin-top: 16px; font: 700 14px var(--mont); color: var(--sky); }

/* ---------- trust strip ---------- */
.truststrip { background: var(--space-2); border-top: 1px solid var(--stroke-d); border-bottom: 1px solid var(--stroke-d); padding: 22px 0; }
.truststrip .wrap { display: flex; gap: 10px 44px; flex-wrap: wrap; justify-content: center; }
.truststrip span { font: 600 13px var(--exo); color: var(--muted-d); display: flex; align-items: center; gap: 9px; }
.truststrip span::before { content: ""; width: 4px; height: 4px; border-radius: 50%; background: var(--sky); }

/* ==========================================================================
   NARRATIVE / MANIFESTO
   ========================================================================== */
.manifesto {
  font: 400 clamp(15.5px, 1.5vw, 17.5px)/1.75 var(--exo); color: var(--body-l);
  margin: 0;
}
.manifesto strong { font-weight: 600; color: var(--ink); }

/* clean highlighter — light and dark grounds */
.hl, .hl-d {
  font-weight: 600;
  padding: 0.06em 0.3em;
  margin: 0 -0.06em;
  border-radius: 5px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
.hl { color: var(--ink); background: linear-gradient(104deg, rgba(245, 175, 45, 0.32), rgba(242, 102, 46, 0.24)); }
.hl-d { color: #fff; background: linear-gradient(104deg, rgba(245, 175, 45, 0.28), rgba(53, 167, 232, 0.26)); }

/* ---------- case chip ---------- */
.case-chip {
  display: inline-flex; align-items: center; gap: 14px; flex-wrap: wrap;
  background: var(--card); border: 1px solid var(--stroke-l); border-radius: 999px;
  padding: 12px 24px; margin: 8px 0 36px; box-shadow: var(--sh);
  font: 500 14px var(--exo); color: var(--body-l);
}
.case-chip b { color: var(--ink); font-weight: 600; }
.case-chip .sep { color: var(--stroke-l); }

/* ---------- methods ---------- */
.methods { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.method {
  position: relative;
  background: var(--card); border: 1px solid var(--stroke-l); border-radius: var(--r);
  padding: 28px 30px; display: flex; flex-direction: column; min-height: 250px;
  transition: transform 0.3s cubic-bezier(.2,.6,.2,1), box-shadow 0.3s, border-color 0.3s;
}
.method:hover { transform: translateY(-5px); box-shadow: var(--sh); border-color: #d5deea; }
.method .k { font: 700 10.5px var(--mont); letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted-l); margin-bottom: 8px; }
.method h3 { font-size: 18px; font-weight: 700; margin-bottom: 14px; }
.method .num {
  font: 800 clamp(30px, 3vw, 38px)/1 var(--mont); font-variant-numeric: tabular-nums;
  color: var(--ink); margin-bottom: 16px;
}
.method .ctrl { margin-top: auto; }
.method .ctrl label { font: 600 12.5px var(--exo); color: var(--muted-l); display: flex; justify-content: space-between; margin-bottom: 8px; }
.method input[type="range"] { width: 100%; accent-color: var(--orange); }
.method .quip { font: 400 13.5px/1.6 var(--exo); color: var(--muted-l); margin-top: 14px; }

/* black box */
.method.blackbox { background: #0c1524; border: 1px solid #1d2c42; }
.method.blackbox .k { color: #5d7690; }
.method.blackbox h3 { color: #e8eef5; }
.method.blackbox .num { color: #e8eef5; letter-spacing: 0.04em; }
.method.blackbox .quip { color: #7d92a8; }
.method.blackbox:hover { border-color: #2c405c; box-shadow: var(--sh-d); }
.redacted { display: inline-block; height: 0.72em; width: 2.2ch; border-radius: 3px; background: #2a3c55; vertical-align: baseline; }
.method.blackbox button {
  font: 700 13.5px var(--mont); color: var(--sky); background: none; border: 1px solid #223650;
  border-radius: 999px; padding: 9px 18px; cursor: pointer; transition: border-color 0.25s, background 0.25s;
}
.method.blackbox button:hover { border-color: var(--sky); background: rgba(53, 167, 232, 0.08); }
.method.blackbox.shake { animation: bbshake 0.4s; }
@keyframes bbshake { 0%,100% { transform: translateX(0); } 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }

/* ours */
.method.ours { position: relative; background: linear-gradient(160deg, #0d2036, #0a1626); border: 1px solid transparent; }
.method.ours::before {
  content: ""; position: absolute; inset: -1px; border-radius: 19px; padding: 1.2px;
  background: var(--grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  pointer-events: none;
}
.method.ours .k { color: var(--amber); }
.method.ours h3 { color: #fff; }
.method.ours .num {
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.method.ours .quip { color: var(--muted-d); }
.method.ours:hover { box-shadow: 0 14px 40px rgba(30, 90, 140, 0.25); }

/* range bar (ours) */
.rangebar { position: relative; height: 36px; margin-top: 4px; }
.rangebar .track { position: absolute; top: 16px; left: 0; right: 0; height: 3px; border-radius: 2px; background: rgba(255, 255, 255, 0.12); }
.rangebar .band { position: absolute; top: 13px; height: 9px; border-radius: 5px; background: var(--grad); opacity: 0.8; }
.rangebar .pin { position: absolute; top: 8px; width: 2.5px; height: 19px; border-radius: 2px; background: #fff; }
.rangebar .cap { position: absolute; top: 26px; font: 600 11px var(--exo); color: var(--muted-d); transform: translateX(-50%); }

/* ==========================================================================
   STEPS
   ========================================================================== */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 48px; }
.step {
  position: relative; background: var(--glass); border: 1px solid var(--stroke-d); border-radius: var(--r);
  padding: 30px; transition: transform 0.3s cubic-bezier(.2,.6,.2,1), border-color 0.3s, background 0.3s;
}
.step:hover { transform: translateY(-5px); border-color: rgba(148, 184, 216, 0.34); background: var(--glass-2); }
.step .k { font: 800 34px/1 var(--mont); background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; margin-bottom: 16px; }
.step h3 { font-size: 19px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.step p { font-size: 14.5px; color: var(--muted-d); }
.step .viz { height: 92px; margin: 16px 0 4px; }

/* ==========================================================================
   CALCULATOR
   ========================================================================== */
#calculator .lede { margin-bottom: 8px; }
.calc { display: grid; grid-template-columns: 384px 1fr; gap: 26px; margin-top: 44px; align-items: start; }
.inputs { background: var(--card); border: 1px solid var(--stroke-l); border-radius: var(--r); padding: 30px; }
.inputs h3 { font-size: 16px; font-weight: 700; margin-bottom: 20px; }
.field { margin-bottom: 22px; }
.field > label { display: block; font: 600 13.5px var(--mont); color: var(--ink); margin-bottom: 8px; }
.field select, .field input[type="number"] {
  width: 100%; padding: 12px 14px; font: 500 15px var(--exo);
  border: 1.5px solid var(--stroke-l); border-radius: 12px; background: #fff; color: var(--ink);
  transition: border-color 0.2s;
}
.field select:focus, .field input:focus { outline: none; border-color: var(--sky); }
.field .hint { font: 400 12.5px/1.55 var(--exo); color: var(--muted-l); margin-top: 7px; }
.seg { display: flex; border: 1.5px solid var(--stroke-l); border-radius: 12px; overflow: hidden; }
.seg button {
  flex: 1; padding: 10px 4px; font: 600 12.5px var(--exo); color: var(--body-l);
  background: #fff; border: 0; cursor: pointer; transition: background 0.2s, color 0.2s;
}
.seg button + button { border-left: 1.5px solid var(--stroke-l); }
.seg button:hover { background: #f2f6fb; }
.seg button.on { background: var(--ink); color: #fff; }
.assump { border-top: 1px dashed var(--stroke-l); padding-top: 14px; font: 400 12.5px/1.6 var(--exo); color: var(--muted-l); }

.outputs .headline {
  position: relative; border-radius: var(--r); padding: 34px 38px; overflow: hidden;
  background: linear-gradient(150deg, #0d2036, var(--space-2));
  border: 1px solid var(--stroke-d);
}
.outputs .headline .label { font: 700 11px var(--mont); letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted-d); }
.outputs .headline .big {
  font: 800 clamp(40px, 4.6vw, 56px)/1.06 var(--mont); font-variant-numeric: tabular-nums;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  margin: 10px 0 6px;
}
.outputs .headline .range { font: 500 14px var(--exo); color: var(--muted-d); font-variant-numeric: tabular-nums; }
.outputs .row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 18px 0; }
.mini { background: var(--card); border: 1px solid var(--stroke-l); border-radius: var(--r); padding: 18px 22px; transition: transform 0.25s, box-shadow 0.25s; }
.mini:hover { transform: translateY(-3px); box-shadow: var(--sh); }
.mini .label { font: 700 10.5px var(--mont); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted-l); }
.mini .val { font: 800 23px/1.15 var(--mont); font-variant-numeric: tabular-nums; color: var(--ink); margin-top: 7px; }
.mini .sub { font: 400 12px var(--exo); color: var(--muted-l); margin-top: 3px; }
.chartbox { background: var(--card); border: 1px solid var(--stroke-l); border-radius: var(--r); padding: 24px 26px 18px; }
.chartbox h4 { font-size: 14px; font-weight: 700; }
.chartbox .sub { font: 400 12.5px var(--exo); color: var(--muted-l); margin: 3px 0 10px; }
#calc-chart { width: 100%; height: 250px; display: block; }
.floor {
  margin-top: 18px; border-radius: var(--r);
  background: linear-gradient(92deg, rgba(53, 167, 232, 0.07), rgba(245, 175, 45, 0.1));
  border: 1px solid #eadfc0;
  padding: 18px 24px; font: 400 14px/1.65 var(--exo); color: #5d5030;
}
.floor b { font-weight: 600; }
.floor a { font: 700 14px var(--mont); color: var(--orange); }

/* ==========================================================================
   QUOTE BAND
   ========================================================================== */
.quoteband { text-align: center; padding: 90px 0; }
.quoteband blockquote {
  font: 500 clamp(22px, 2.8vw, 32px)/1.5 var(--exo); color: #fff; max-width: 760px; margin: 0 auto;
  text-wrap: balance;
}
.quoteband blockquote::before { content: "“"; display: block; font: 800 64px/0.6 var(--mont); background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; margin-bottom: 18px; }
.quoteband cite { display: block; margin-top: 20px; font: 600 13px var(--mont); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted-d); font-style: normal; }

/* ==========================================================================
   SERVICES
   ========================================================================== */
.tiers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 46px; }
.tier {
  position: relative; background: var(--card); border: 1px solid var(--stroke-l); border-radius: var(--r);
  padding: 28px 26px; display: flex; flex-direction: column;
  transition: transform 0.32s cubic-bezier(.2,.6,.2,1), box-shadow 0.32s, border-color 0.32s;
}
.tier:hover { transform: translateY(-8px); box-shadow: 0 16px 40px rgba(16, 29, 48, 0.1); border-color: #cfdaea; }
.tier.flag::before {
  content: ""; position: absolute; inset: -1px; border-radius: 19px; padding: 1.4px;
  background: var(--grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  pointer-events: none;
}
.tier .badge {
  align-self: flex-start; font: 700 10.5px var(--mont); letter-spacing: 0.12em; text-transform: uppercase;
  background: var(--grad-soft); color: var(--orange); border-radius: 999px; padding: 5px 12px; margin-bottom: 14px;
}
.tier h3 { font-size: 16.5px; font-weight: 700; }
.tier .price { font: 800 26px/1 var(--mont); font-variant-numeric: tabular-nums; color: var(--ink); margin: 12px 0 3px; }
.tier .price span { font-size: 14px; font-weight: 700; }
.tier .per { font: 500 12px var(--exo); color: var(--muted-l); margin-bottom: 16px; }
.tier ul { list-style: none; margin-bottom: 18px; }
.tier li { font: 400 13.5px/1.55 var(--exo); padding: 5px 0 5px 22px; position: relative; color: var(--body-l); }
.tier li::before { content: ""; position: absolute; left: 2px; top: 12px; width: 8px; height: 2px; border-radius: 2px; background: var(--grad); }
.tier .use { margin-top: auto; border-top: 1px dashed var(--stroke-l); padding-top: 12px; font: 400 12.5px/1.5 var(--exo); color: var(--muted-l); }
.sample-link { color: var(--orange); font-weight: 700; white-space: nowrap; }
.sample-link:hover { text-decoration: underline; }

/* ==========================================================================
   BOTH SIDES
   ========================================================================== */
.sides { display: grid; grid-template-columns: 1fr 1fr; border-radius: 24px; overflow: hidden; margin-top: 46px; border: 1px solid var(--stroke-d); }
.side { padding: 54px 50px; }
.side.plaintiff { background: linear-gradient(160deg, #0e2138, var(--space-2)); }
.side.plaintiff h3, .side.plaintiff strong { color: #fff; }
.side.plaintiff p, .side.plaintiff li { color: var(--body-d); }
.side.defense { background: var(--card); }
.dark .side.defense h3 { color: var(--ink); }
.dark .side.defense p, .dark .side.defense li { color: var(--body-l); }
.side h3 { font-size: 23px; font-weight: 800; margin-bottom: 8px; }
.side .who { font: 700 11px var(--mont); letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: 18px; }
.side.plaintiff .who { color: var(--amber); }
.side.defense .who { color: var(--sky-deep); }
.side ul { list-style: none; margin-top: 16px; }
.side li { padding: 7px 0 7px 26px; position: relative; font-size: 15px; }
.side li::before { content: "→"; position: absolute; left: 0; font-weight: 700; }
.side.plaintiff li::before { color: var(--amber); }
.side.defense li::before { color: var(--sky-deep); }
.bridge { text-align: center; margin-top: -22px; position: relative; z-index: 2; }
.bridge span {
  display: inline-block; background: var(--grad); color: var(--space);
  font: 800 12px var(--mont); letter-spacing: 0.08em; padding: 12px 26px; border-radius: 999px;
}

/* ==========================================================================
   ABOUT
   ========================================================================== */
.about { display: grid; grid-template-columns: 340px 1fr; gap: 56px; align-items: start; }
.portrait { position: relative; border-radius: 24px; overflow: hidden; }
.portrait img { width: 100%; aspect-ratio: 4/4.9; object-fit: cover; display: block; }
.portrait::after {
  content: ""; position: absolute; inset: 0; border-radius: 24px;
  box-shadow: inset 0 0 0 1px rgba(16, 29, 48, 0.08);
  background: linear-gradient(200deg, rgba(53, 167, 232, 0.08), transparent 40%);
  pointer-events: none;
}
.about h2.display { margin-bottom: 6px; }
.about .role { font: 700 13px var(--mont); letter-spacing: 0.1em; text-transform: uppercase; color: var(--orange); margin-bottom: 20px; }
.about p { margin-bottom: 15px; }
.about .creds { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.about .creds span {
  font: 600 12.5px var(--exo); background: var(--card); border: 1px solid var(--stroke-l);
  border-radius: 999px; padding: 8px 16px; color: var(--ink);
  transition: transform 0.25s, border-color 0.25s;
}
.about .creds span:hover { transform: translateY(-2px); border-color: var(--sky); }
.journals { margin-top: 22px; font: 400 14px/1.9 var(--exo); font-style: italic; color: var(--muted-l); max-width: 58ch; }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq details { border-bottom: 1px solid var(--stroke-d); padding: 24px 4px; }
.faq summary {
  cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 22px;
  font: 700 17.5px/1.4 var(--mont); color: #fff; transition: color 0.2s;
}
.faq summary:hover { color: var(--sky); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; font: 300 28px/1 var(--exo); background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  flex: none; transition: transform 0.3s;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin-top: 14px; max-width: 70ch; font-size: 15px; }

/* ==========================================================================
   CTA + FOOTER
   ========================================================================== */
.cta-band {
  position: relative; border-radius: 28px; overflow: hidden;
  background: linear-gradient(150deg, #0e2643, var(--space-2));
  border: 1px solid var(--stroke-d);
  padding: 60px; display: grid; grid-template-columns: 1.35fr 1fr; gap: 44px; align-items: center;
}
.cta-band::before {
  content: ""; position: absolute; inset: -1px; border-radius: 29px; padding: 1px;
  background: linear-gradient(130deg, rgba(53, 167, 232, 0.4), transparent 40%, transparent 60%, rgba(245, 175, 45, 0.35));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  pointer-events: none;
}
.cta-band h2 { font-size: clamp(26px, 3.2vw, 40px); font-weight: 800; color: #fff; margin-bottom: 14px; text-wrap: balance; }
.cta-band p { color: var(--muted-d); }
.cta-band .side-info { font: 400 14.5px/1.7 var(--exo); color: var(--body-d); }
.cta-band .side-info b { display: block; color: #fff; font-family: var(--mont); margin-bottom: 4px; }
.cta-band .side-info a { color: var(--sky); }

footer.site { background: var(--space); border-top: 1px solid var(--stroke-d); padding: 46px 0 58px; }
footer.site .cols { display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; margin-bottom: 26px; }
footer.site .fbrand { display: flex; align-items: center; gap: 11px; }
footer.site .fbrand img { height: 46px; }
footer.site .fbrand .word { font: 700 17px var(--mont); color: #fff; }
footer.site .fbrand .word b { color: var(--sky); }
footer.site nav { display: flex; gap: 26px; font: 600 13.5px var(--mont); }
footer.site nav a { color: var(--body-d); }
footer.site nav a:hover { color: #fff; text-decoration: none; }
.smallprint { font: 400 12px/1.7 var(--exo); color: var(--muted-d); max-width: none; }

/* ---------- contact form ---------- */
.contact-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 52px; align-items: start; }
.contact-points { list-style: none; margin-top: 26px; display: flex; flex-direction: column; gap: 12px; }
.contact-points li { display: flex; align-items: center; gap: 11px; font: 500 15px var(--exo); color: var(--body-l); }
.contact-points i { width: 7px; height: 7px; border-radius: 50%; background: var(--grad); flex: none; }
.contact-form { background: #fff; border: 1px solid var(--stroke-l); border-radius: 18px; padding: 30px; box-shadow: var(--sh); }
.contact-form .f2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form .ff { margin-bottom: 16px; display: flex; flex-direction: column; }
.contact-form label { font: 600 12.5px var(--mont); color: var(--muted-l); margin-bottom: 7px; }
.contact-form input, .contact-form select, .contact-form textarea {
  font: 400 15px var(--exo); color: var(--ink); background: #f7f9fc;
  border: 1px solid var(--stroke-l); border-radius: 10px; padding: 11px 13px; width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--sky); box-shadow: 0 0 0 3px rgba(53, 167, 232, 0.14); background: #fff;
}
.contact-form textarea { resize: vertical; }
.contact-form button[type="submit"] { width: 100%; margin-top: 4px; border: none; cursor: pointer; }
.form-note { font: 400 12px var(--exo); color: var(--muted-l); margin-top: 12px; text-align: center; }
.form-status { font: 500 14px/1.5 var(--exo); margin-top: 14px; text-align: center; }
.form-status.ok { color: #1c7d52; }
.form-status.err { color: #c0392b; }
.form-status a { color: var(--sky); }
@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; gap: 28px; }
  .contact-form .f2 { grid-template-columns: 1fr; }
}

/* ==========================================================================
   SCIENCE PAGE
   ========================================================================== */
.pagehead { padding: 176px 0 78px; background: radial-gradient(900px 480px at 76% 0%, #0e2440 0%, var(--space) 60%); position: relative; overflow: hidden; }
.pagehead h1 { font-size: clamp(34px, 4.6vw, 56px); font-weight: 800; color: #fff; max-width: 22ch; text-wrap: balance; }
.pagehead p { color: var(--body-d); font-size: 18px; max-width: 60ch; margin-top: 18px; }
.prose { max-width: 760px; }
.prose h2 { font-size: clamp(24px, 2.8vw, 32px); font-weight: 800; margin: 54px 0 16px; }
.prose h3 { font-size: 18px; font-weight: 700; margin: 30px 0 10px; color: var(--ink); }
.prose p, .prose li { margin-bottom: 14px; font-size: 16px; }
.prose ul, .prose ol { margin: 0 0 16px 24px; }
.eq {
  background: var(--card); border: 1px solid var(--stroke-l); border-radius: var(--r);
  padding: 22px 28px; font: italic 500 17px Georgia, serif; color: var(--ink);
  text-align: center; margin: 24px 0; overflow-x: auto;
}
.refs { font-size: 13.5px; color: var(--muted-l); }
.refs li { margin-bottom: 10px; }
.refs a { color: var(--sky); word-break: break-word; }
.refs-head { font-size: 22px; font-weight: 800; margin: 54px 0 16px; padding-top: 20px; border-top: 1px solid var(--stroke-l); }

/* ---------- research pages: eyebrow, sub-nav, intro, divider ---------- */
.pagehead .ph-eyebrow { font: 700 12px var(--mont); letter-spacing: 0.22em; text-transform: uppercase; color: var(--amber); margin-bottom: 14px; }
.subnav { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 34px; }
.subnav a {
  font: 700 12.5px var(--mont); letter-spacing: 0.02em; color: var(--muted-l);
  padding: 8px 15px; border: 1px solid var(--stroke-l); border-radius: 999px;
  background: #fff; transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.subnav a:hover { border-color: var(--sky); color: var(--sky); text-decoration: none; }
.subnav a.on { background: var(--ink); color: #fff; border-color: var(--ink); }
.lead-intro { font-size: 19px !important; line-height: 1.6; color: var(--body-l); max-width: 68ch; }
.lead-intro a { color: var(--sky); }
.prose .dig { display: flex; align-items: center; gap: 16px; margin: 40px 0 26px; }
.prose .dig::after { content: ""; flex: 1; height: 1px; background: linear-gradient(90deg, var(--stroke-l), transparent); }
.prose .dig span { font: 700 12px var(--mont); letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted-l); white-space: nowrap; }
.prose .dig::before { content: ""; width: 22px; height: 2px; border-radius: 2px; background: var(--grad); }
.prose a { color: var(--sky); }
.prose .fig { margin: 30px 0 34px; }
.prose .fig img { width: 100%; height: auto; border: 1px solid var(--stroke-l); border-radius: 14px; box-shadow: var(--sh); }
.prose .fig figcaption { font: 400 13px/1.6 var(--exo); color: var(--muted-l); margin-top: 13px; max-width: 62ch; }

/* ==========================================================================
   V4 ADDITIONS — hero mark, epigraph, silhouette, info modals, signatures
   ========================================================================== */

/* hero brand emblem */
.hero-mark { height: 88px; width: auto; margin-bottom: 24px; filter: drop-shadow(0 6px 18px rgba(53, 167, 232, 0.22)); }

/* epigraph (light) & pull-quote (dark) — gradient bar + italic */
.epigraph, .pullquote { position: relative; padding-left: 26px; }
.epigraph::before, .pullquote::before {
  content: ""; position: absolute; left: 0; top: 4px; bottom: 4px; width: 3px;
  border-radius: 2px; background: var(--grad);
}
.epigraph { margin: 6px 0 40px; }
.epigraph blockquote { font: italic 500 clamp(19px, 2.4vw, 25px)/1.45 var(--exo); color: var(--ink); max-width: 30ch; }
.epigraph figcaption { margin-top: 10px; font: 600 11.5px var(--mont); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted-l); }
.pullquote { margin: 44px 0 0; max-width: 720px; }
.pullquote blockquote { font: italic 500 clamp(19px, 2.2vw, 24px)/1.5 var(--exo); color: #fff; }
.pullquote figcaption { margin-top: 12px; font: 600 11.5px var(--mont); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted-d); }

/* problem two-column + silhouette */
.problem-intro { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items: center; }
.problem-intro .display { margin-bottom: 18px; }
.silhouette { display: flex; justify-content: center; align-items: flex-end; }
.silhouette img {
  max-height: 600px; width: auto; filter: drop-shadow(0 26px 50px rgba(16, 29, 48, 0.20));
  animation: mariaFloat 7s ease-in-out infinite;
}
@keyframes mariaFloat {
  0%, 100% { transform: translateY(0) rotate(-0.2deg); }
  50%      { transform: translateY(-14px) rotate(0.2deg); }
}
@media (prefers-reduced-motion: reduce) { .silhouette img { animation: none; } }
.leadin { font: 500 clamp(16.5px, 1.8vw, 19px)/1.65 var(--exo); color: var(--body-l); max-width: 62ch; margin: 40px 0 28px; }
.leadin strong { color: var(--ink); font-weight: 600; }

/* card corner — info button + signature mark */
.card-corner { position: absolute; top: 18px; right: 18px; display: flex; align-items: center; gap: 10px; z-index: 4; }
.info-btn {
  width: 23px; height: 23px; border-radius: 50%; padding: 0; cursor: pointer;
  border: 1.5px solid var(--stroke-l); background: #fff; color: var(--muted-l);
  font: italic 700 13px/1 Georgia, serif; display: grid; place-items: center;
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
}
.info-btn:hover { border-color: var(--sky); color: var(--sky); transform: scale(1.12); }
.info-btn.dark { background: rgba(255, 255, 255, 0.08); border-color: #3a5170; color: #aab9cc; }
.info-btn.dark:hover { border-color: var(--sky); color: #fff; }
.card-sig { height: 40px; width: auto; }

/* section signature mark (top-right) */
#method, #calculator, .pagehead { position: relative; }
.sig {
  position: absolute; top: 80px; height: 92px; width: auto; opacity: 0.92; z-index: 3;
  right: max(28px, calc((100% - 1180px) / 2 + 28px));
}
.pagehead .sig { top: 118px; height: 116px; opacity: 0.96; }

/* fix quote-band mark cutoff */
.quoteband blockquote::before {
  content: "\201C"; display: block; font: 800 76px/1 var(--mont);
  color: var(--amber); opacity: 0.85;
  margin-bottom: 2px; padding-top: 8px;
}

/* ---------- info modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 200; display: grid; place-items: center; padding: 24px;
  background: rgba(4, 10, 20, 0.62); backdrop-filter: blur(6px);
  opacity: 0; transition: opacity 0.25s;
}
.modal-backdrop.show { opacity: 1; }
.modal-backdrop[hidden] { display: none; }
.modal {
  position: relative; background: var(--card); border-radius: 22px; max-width: 560px; width: 100%;
  padding: 38px 40px 34px; box-shadow: 0 30px 90px rgba(4, 10, 20, 0.45);
  max-height: 88vh; overflow-y: auto;
  transform: translateY(14px) scale(0.97); transition: transform 0.3s cubic-bezier(.2,.7,.2,1);
}
.modal-backdrop.show .modal { transform: none; }
.modal-close {
  position: absolute; top: 16px; right: 18px; width: 34px; height: 34px; border-radius: 50%;
  border: 0; background: #eff3f8; color: var(--muted-l); font-size: 22px; line-height: 1; cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.modal-close:hover { background: #e4eaf2; color: var(--ink); }
.modal-eyebrow { font: 700 11px var(--mont); letter-spacing: 0.16em; text-transform: uppercase; color: var(--orange); margin-bottom: 10px; }
.modal-title { font-size: 25px; font-weight: 800; color: var(--ink); margin-bottom: 16px; }
.modal-body { font: 400 15.5px/1.72 var(--exo); color: var(--body-l); }
.modal-body p { margin-bottom: 12px; }
.modal-body b { color: var(--ink); font-weight: 700; }
.modal-body .verdict {
  margin-top: 16px; padding: 14px 18px; border-radius: 13px;
  background: #f3f5f9; border-left: 3px solid var(--orange); font-size: 14.5px;
}
.modal-body .verdict.good { border-left-color: var(--sky); background: linear-gradient(100deg, rgba(53,167,232,0.09), rgba(245,175,45,0.09)); }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 980px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 44px; }
  #net-canvas { opacity: 0.55; }
  .problem-intro { grid-template-columns: 1fr; gap: 8px; }
  .silhouette { justify-content: flex-start; margin-top: 8px; }
  .silhouette img { max-height: 300px; }
  .sig { top: 78px; height: 38px; }
  .methods { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .calc { grid-template-columns: 1fr; }
  .tiers { grid-template-columns: 1fr 1fr; }
  .sides { grid-template-columns: 1fr; }
  .about { grid-template-columns: 1fr; }
  .portrait { max-width: 340px; }
  .cta-band { grid-template-columns: 1fr; padding: 42px 34px; }
}
@media (max-width: 640px) {
  section { padding: 72px 0; }
  .hero { padding: 128px 0 72px; }
  .nav { height: auto; flex-wrap: wrap; padding: 12px 0; row-gap: 4px; }
  .nav ul { gap: 16px; width: 100%; flex-wrap: wrap; }
  .nav ul a:not(.cta) { font-size: 13.5px; }
  .nav ul li.hide-m { display: none; }
  .nav .cta { padding: 8px 16px; font-size: 12.5px; }
  .nav .sub { display: none; } /* mobile: parent link navigates; sub-pages carry their own pill sub-nav */
  .brand img { height: 42px; }
  .brand .word { font-size: 17px; }
  header.site { background: rgba(7, 15, 30, 0.9); backdrop-filter: blur(14px); }
  .outputs .row { grid-template-columns: 1fr; }
  .tiers { grid-template-columns: 1fr; }
  .instant { padding: 24px 20px; }
  .side { padding: 40px 28px; }
  .sig { display: none; }
  .silhouette img { max-height: 260px; }
  .modal { padding: 30px 24px 26px; }
  .modal-title { font-size: 22px; }
}