/* ==========================================================================
   Headway — design system  (v2: near-monochrome · DM Sans · oversized)
   Dark base · white as the only "accent" · navy hero stage · sharp cards + pill buttons
   ========================================================================== */

:root {
  --bg: hsl(240 6% 5%);
  --surface: hsl(240 5% 9%);
  --surface-2: hsl(240 5% 12%);
  --border: hsl(240 5% 17%);
  --border-strong: hsl(240 5% 28%);
  --ink: hsl(0 0% 98%);
  --ink-muted: hsl(240 5% 68%);
  --ink-faint: hsl(240 5% 46%);

  /* "accent" is monochrome white — the leftclick move */
  --accent: hsl(0 0% 98%);
  --accent-hover: hsl(0 0% 86%);
  --accent-ink: hsl(240 8% 7%);
  --accent-soft: hsl(0 0% 100% / 0.08);

  /* navy — used only in the hero stage */
  --navy-deep: hsl(224 58% 13%);
  --navy: hsl(223 70% 27%);

  --font-display: "DM Sans", system-ui, sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;

  --container: 1180px;
  --pad-x: clamp(1.25rem, 5vw, 2.5rem);
  --section-y: clamp(5rem, 10vw, 9rem);
  --radius: 4px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--font-body); font-size: 1.15rem; line-height: 1.6;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4 {
  font-family: var(--font-display); font-weight: 700; line-height: 1.02;
  letter-spacing: -0.035em; margin: 0; text-wrap: balance;
}
h1 { font-size: clamp(3rem, 8vw, 6rem); }
h2 { font-size: clamp(2.25rem, 5vw, 3.75rem); }
h3 { font-size: 1.6rem; letter-spacing: -0.02em; }
p { margin: 0 0 1rem; max-width: 66ch; }
::selection { background: var(--ink); color: var(--bg); }

.container { max-width: var(--container); margin: 0 auto; padding-inline: var(--pad-x); }
.section { padding-block: var(--section-y); }
.section--tight { padding-block: clamp(3rem, 6vw, 5rem); }
.section--line { border-top: 1px solid var(--border); }
.eyebrow {
  display: inline-block; font-family: var(--font-display); font-size: 0.8rem;
  font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ink-faint); margin-bottom: 1.5rem;
}
.eyebrow--accent { color: var(--ink); }
.lead { font-size: clamp(1.25rem, 2vw, 1.6rem); color: var(--ink-muted); line-height: 1.5; letter-spacing: -0.01em; }
.muted { color: var(--ink-muted); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 0.55rem;
  min-height: 52px; padding: 0.8rem 1.7rem; border-radius: 999px; border: 1px solid transparent;
  font-family: var(--font-display); font-weight: 600; font-size: 1rem; letter-spacing: -0.01em; white-space: nowrap;
  transition: transform .15s var(--ease), background .18s ease, box-shadow .18s ease, border-color .18s ease, color .18s ease;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 10px 34px -10px hsl(0 0% 100% / 0.35); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--ink); background: hsl(0 0% 100% / 0.04); }
.btn .arrow { transition: transform .2s var(--ease); }
.btn:hover .arrow { transform: translate(3px, -3px); }

/* ---- Nav ---- */
.nav { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid transparent; transition: background .25s ease, border-color .25s ease, backdrop-filter .25s ease; }
.nav.scrolled { background: hsl(240 6% 5% / 0.72); backdrop-filter: blur(14px); border-bottom-color: var(--border); }
.nav .container { padding-left: clamp(0.25rem, 1vw, 0.5rem); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 104px; }
.brand { display: inline-flex; align-items: center; gap: 0.1rem; margin-left: -1.5rem; }
.brand img { height: 72px; width: auto; }
.brand-word { font-family: var(--font-display); font-weight: 300; font-size: 1.75rem; letter-spacing: -0.01em; text-transform: uppercase; color: var(--ink); }
.brand-word strong { font-weight: 800; }
.nav-links { display: flex; align-items: center; gap: 2.25rem; }
.nav-link { font-size: 1rem; color: var(--ink-muted); position: relative; padding: 0.25rem 0; transition: color .18s ease; }
.nav-link::after { content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0; background: var(--ink); transition: width .22s var(--ease); }
.nav-link:hover { color: var(--ink); }
.nav-link:hover::after, .nav-link[aria-current="page"]::after { width: 100%; }
.nav-link[aria-current="page"] { color: var(--ink); }
.nav-actions { display: flex; align-items: center; gap: 1rem; }
.nav-burger { display: none; background: none; border: 0; padding: 0.5rem; color: var(--ink); min-width: 44px; min-height: 44px; align-items: center; justify-content: center; }
.nav-burger svg { display: block; }

.drawer { position: fixed; inset: 0; z-index: 60; background: var(--bg); display: flex; flex-direction: column; justify-content: center; gap: 1.5rem; padding: var(--pad-x); transform: translateX(100%); transition: transform .3s var(--ease); }
.drawer.open { transform: translateX(0); }
.drawer a { font-family: var(--font-display); font-size: 2rem; font-weight: 600; color: var(--ink); }
.drawer .btn { align-self: flex-start; margin-top: 1rem; }
.drawer-close { position: absolute; top: 1.5rem; right: var(--pad-x); background: none; border: 0; color: var(--ink); padding: 0.5rem; }

/* ---- Hero (navy stage, centered, watermark) ---- */
.hero {
  position: relative; overflow: hidden; text-align: center;
  padding-block: clamp(6rem, 14vw, 11rem);
  background:
    radial-gradient(120% 75% at 50% 50%, hsl(223 70% 27% / 0.55) 0%, hsl(224 58% 13% / 0.35) 42%, transparent 72%),
    linear-gradient(180deg, var(--bg) 0%, var(--navy-deep) 34%, var(--navy) 50%, var(--navy-deep) 66%, var(--bg) 100%);
}
.hero-mark {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: min(760px, 96vw); opacity: 0.05; pointer-events: none; z-index: 0; filter: saturate(0);
}
.hero .container { position: relative; z-index: 1; }
.hero h1 { max-width: 15ch; margin-inline: auto; }
.hero-sub { margin: 1.75rem auto 0; max-width: 60ch; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.75rem; justify-content: center; }
.rotator { color: var(--ink); white-space: nowrap; }

.stats { display: flex; flex-wrap: wrap; gap: clamp(1.5rem, 5vw, 4rem); justify-content: center; margin-top: 4rem; padding-top: 2.5rem; border-top: 1px solid hsl(0 0% 100% / 0.12); }
.stat-num { font-family: var(--font-display); font-weight: 700; font-size: clamp(2rem, 3.5vw, 2.75rem); letter-spacing: -0.03em; font-feature-settings: "tnum"; }
.stat-label { color: var(--ink-muted); font-size: 0.95rem; margin-top: 0.25rem; }

.sec-head { max-width: 46ch; margin-bottom: 3.5rem; }
.sec-head.center { margin-inline: auto; text-align: center; }

.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 2rem; transition: transform .2s var(--ease), border-color .2s ease, background .2s ease; }
.card:hover { transform: translateY(-4px); border-color: var(--border-strong); background: var(--surface-2); }
.card .ico { width: 42px; height: 42px; display: grid; place-items: center; color: var(--ink); margin-bottom: 1.2rem; }
.card h3 { margin-bottom: 0.55rem; }
.card p { color: var(--ink-muted); margin: 0; font-size: 1.02rem; }

.leaks { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.leak { border-left: 2px solid var(--ink); padding: 0.25rem 0 0.25rem 1.4rem; }
.leak .big { font-family: var(--font-display); font-weight: 700; font-size: clamp(2.25rem,4vw,3rem); letter-spacing: -0.03em; }
.leak p { color: var(--ink-muted); margin: 0.35rem 0 0; font-size: 1rem; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.step { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 2rem; }
.step .n { font-family: var(--font-display); font-weight: 700; color: var(--ink); font-size: 0.95rem; letter-spacing: 0.1em; }
.step h3 { margin: 0.85rem 0 0.55rem; }
.step p { color: var(--ink-muted); margin: 0; font-size: 1.02rem; }

.band { background: var(--surface); border-block: 1px solid var(--border); }
.band-inner { display: flex; gap: 2rem; align-items: center; flex-wrap: wrap; justify-content: space-between; }
.badge { display: inline-flex; align-items: center; gap: 0.5rem; background: var(--accent-soft); color: var(--ink); border: 1px solid hsl(0 0% 100% / 0.2); border-radius: 999px; padding: 0.45rem 1rem; font-size: 0.85rem; font-weight: 600; font-family: var(--font-display); letter-spacing: 0.02em; }

.founder { display: grid; grid-template-columns: 340px 1fr; gap: clamp(2rem,5vw,4.5rem); align-items: center; }
.founder-photo { border-radius: var(--radius); border: 1px solid var(--border); width: 100%; aspect-ratio: 4/5; object-fit: cover; background: var(--surface-2); }
.founder blockquote { margin: 0; }
.founder .sig { margin-top: 1.75rem; font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; }
.founder .sig span { display: block; color: var(--ink-faint); font-weight: 400; font-size: 0.95rem; }

/* ---- Calculator ---- */
.calc { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.calc-inputs { padding: clamp(1.75rem, 3vw, 2.75rem); }
.calc-result { padding: clamp(1.75rem, 3vw, 2.75rem); background: var(--surface-2); border-left: 1px solid var(--border); display: flex; flex-direction: column; }
.field { margin-bottom: 1.6rem; }
.field-top { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 0.65rem; }
.field label { color: var(--ink-muted); font-size: 1rem; }
.field .val { font-family: var(--font-display); font-weight: 700; color: var(--ink); font-feature-settings: "tnum"; }
input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 4px; background: var(--border-strong); border-radius: 999px; outline: none; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 20px; height: 20px; border-radius: 50%; background: var(--ink); cursor: pointer; border: 3px solid var(--bg); box-shadow: 0 0 0 1px var(--ink); transition: transform .12s ease; }
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.15); }
input[type="range"]::-moz-range-thumb { width: 20px; height: 20px; border-radius: 50%; background: var(--ink); cursor: pointer; border: 3px solid var(--bg); }
.result-label { color: var(--ink-faint); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.12em; font-family: var(--font-display); }
.result-num { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.03em; font-feature-settings: "tnum"; line-height: 1; color: var(--ink); }
.result-num.big { font-size: clamp(3rem, 7vw, 4.25rem); }
.result-num.mid { font-size: clamp(2rem, 4vw, 2.5rem); color: var(--ink-muted); }
.result-item { margin-bottom: 1.4rem; }
.payoff { color: var(--ink-muted); font-size: 1rem; margin: 0.5rem 0 1.5rem; }
.gate { margin-top: auto; display: flex; gap: 0.5rem; flex-wrap: wrap; }
.gate input[type="email"] { flex: 1 1 180px; min-height: 52px; background: var(--bg); border: 1px solid var(--border-strong); border-radius: 999px; padding: 0 1.2rem; color: var(--ink); font: inherit; }
.gate input[type="email"]:focus { outline: none; border-color: var(--ink); }
.gate-note { color: var(--ink-faint); font-size: 0.85rem; margin: 0.75rem 0 0; }

/* ---- Industries grid ---- */
.ind-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.75rem; }
.ind { display: flex; align-items: center; gap: 0.75rem; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem 1.2rem; transition: border-color .18s ease, transform .18s var(--ease), background .18s ease; }
.ind:hover { border-color: var(--ink); transform: translateY(-3px); background: var(--surface-2); }
.ind .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ink); flex-shrink: 0; }
.ind span { font-size: 1rem; font-weight: 500; }

/* ---- FAQ ---- */
.faq { border-top: 1px solid var(--border); }
.faq details { border-bottom: 1px solid var(--border); }
.faq summary { list-style: none; cursor: pointer; padding: 1.6rem 0; display: flex; justify-content: space-between; gap: 1rem; font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--ink); font-size: 1.6rem; line-height: 1; transition: transform .2s ease; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .ans { color: var(--ink-muted); padding-bottom: 1.6rem; font-size: 1.05rem; }

.cta-final { text-align: center; }
.cta-final .container { max-width: 800px; }

/* ---- Footer ---- */
.footer { border-top: 1px solid var(--border); padding-block: 4.5rem 2.5rem; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 2rem; }
.footer-brand .brand { align-items: flex-start; }
.footer-brand .brand img { height: clamp(120px, 17vw, 200px); opacity: 0.95; }
.footer-brand .brand-word { display: none; }
.footer-col h4 { font-family: var(--font-display); font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 1rem; }
.footer-col a { display: block; color: var(--ink-muted); font-size: 1rem; padding: 0.35rem 0; transition: color .15s ease; }
.footer-col a:hover { color: var(--ink); }
.footer-social { display: flex; gap: 0.75rem; margin-top: 1.25rem; }
.footer-social a { width: 44px; height: 44px; display: grid; place-items: center; border: 1px solid var(--border); border-radius: 999px; color: var(--ink-muted); transition: all .18s ease; }
.footer-social a:hover { border-color: var(--ink); color: var(--ink); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border); color: var(--ink-faint); font-size: 0.9rem; }

/* ---- Scroll reveal ---- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; } .reveal.d2 { transition-delay: .16s; } .reveal.d3 { transition-delay: .24s; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .grid-3, .steps, .leaks { grid-template-columns: 1fr 1fr; }
  .ind-grid { grid-template-columns: repeat(3, 1fr); }
  .founder { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-links, .nav-actions .btn { display: none; }
  .nav-burger { display: flex; }
  .calc { grid-template-columns: 1fr; }
  .calc-result { border-left: 0; border-top: 1px solid var(--border); }
  .brand img { height: 56px; }
  .brand { margin-left: -0.5rem; }
}
@media (max-width: 560px) {
  .grid-3, .grid-2, .steps, .leaks, .ind-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}