/* ============================================================
   ACSL AI — styles
   Dark OLED theme, bright green accent, clean sans-serif.
   ============================================================ */

:root {
  --bg:        #050506;
  --bg-2:      #0b0c0e;
  --surface:   #111316;
  --surface-2: #16191d;
  --border:    #23272d;
  --text:      #f4f5f6;
  --muted:     #9aa1a9;
  --dim:       #61686f;
  --accent:    #5ef38c;   /* bright green */
  --accent-2:  #34d77d;
  --accent-ink:#04150b;
  --ring:      #5ef38c;

  --maxw: 1180px;
  --radius: 16px;
  --radius-sm: 10px;
  --ease: cubic-bezier(.22,.61,.36,1);

  --font-body: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-display: 'Space Grotesk', var(--font-body);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* subtle ambient glow at top */
body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto 0;
  height: 620px;
  background: radial-gradient(900px 420px at 50% -120px, rgba(94,243,140,.10), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 820px; }
.center { text-align: center; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.08; letter-spacing: -0.02em; margin: 0; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }

.accent { color: var(--accent); }

.eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: .98rem;
  padding: 12px 22px;
  border-radius: 999px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), box-shadow .2s var(--ease);
  white-space: nowrap;
}
.btn--lg { padding: 15px 30px; font-size: 1.05rem; }
.btn--solid { background: var(--accent); color: var(--accent-ink); box-shadow: 0 0 0 0 rgba(94,243,140,.5); }
.btn--solid:hover { background: var(--accent-2); transform: translateY(-2px); box-shadow: 0 10px 30px -8px rgba(94,243,140,.5); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

:focus-visible { outline: 2px solid var(--ring); outline-offset: 3px; border-radius: 4px; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(5,5,6,.6);
  border-bottom: 1px solid transparent;
  transition: background .3s var(--ease), border-color .3s var(--ease);
}
.nav.scrolled { background: rgba(5,5,6,.85); border-bottom-color: var(--border); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; letter-spacing: -0.02em; }
.brand__mark { width: 22px; height: 22px; border-radius: 6px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); box-shadow: 0 0 18px rgba(94,243,140,.55); }
.brand__ai { color: var(--accent); }

.nav__links { display: flex; gap: 30px; }
.nav__links a { color: var(--muted); font-weight: 500; font-size: .98rem; transition: color .2s var(--ease); }
.nav__links a:hover { color: var(--text); }

.nav__toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav__toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: .25s var(--ease); }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__mobile { display: none; flex-direction: column; gap: 6px; padding: 14px 24px 24px; border-bottom: 1px solid var(--border); background: var(--bg-2); }
.nav__mobile a { padding: 12px 4px; color: var(--muted); font-weight: 500; border-bottom: 1px solid var(--border); }
.nav__mobile a:last-child { border: 0; margin-top: 8px; }

/* ---------- Hero ---------- */
section { position: relative; z-index: 1; }
.hero { padding: 96px 0 60px; }
.hero__inner { max-width: 900px; margin: 0 auto; text-align: center; }
.hero__title { font-size: clamp(2.6rem, 6.5vw, 5rem); margin-bottom: 26px; }
.hero__lead { font-size: clamp(1.05rem, 2vw, 1.3rem); color: var(--muted); max-width: 660px; margin: 0 auto 36px; }
.hero__cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Section heads ---------- */
.section__head { max-width: 760px; margin: 0 0 56px; }
.section__head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section__title { font-size: clamp(1.9rem, 4vw, 3rem); }
.section__lead { color: var(--muted); font-size: 1.12rem; margin-top: 18px; }

/* ---------- Problem ---------- */
.problem { padding: 110px 0; }
.problem__line { font-family: var(--font-display); font-weight: 600; font-size: clamp(1.5rem, 4vw, 2.5rem); line-height: 1.25; color: var(--muted); margin-bottom: 14px; }
.problem__line.dim { color: var(--dim); }
.problem__line.strong { color: var(--text); margin-top: 34px; }

/* ---------- Solution ---------- */
.solution { position: relative; padding: 110px 0 170px; overflow: hidden; }
.solution > .container { position: relative; z-index: 2; }
.solution .section__title { font-size: clamp(2rem, 5vw, 3.4rem); }
.solution .section__lead { margin-top: 26px; font-size: 1.18rem; }

/* green glow rising from the bottom */
.solution::before {
  content: "";
  position: absolute;
  left: 50%; bottom: -55%;
  width: 150%; height: 130%;
  transform: translateX(-50%);
  transform-origin: 50% 100%;
  background: radial-gradient(closest-side at 50% 100%,
      rgba(94, 243, 140, .55) 0%,
      rgba(46, 196, 118, .30) 38%,
      rgba(94, 243, 140, .07) 62%,
      transparent 78%);
  filter: blur(8px);
  z-index: 0;
  pointer-events: none;
  animation: glowBreathe 7s ease-in-out infinite;
}

/* faint grid, masked so it only shows within the glow */
.solution::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(125% 85% at 50% 115%, #000 30%, transparent 72%);
  mask-image: radial-gradient(125% 85% at 50% 115%, #000 30%, transparent 72%);
  z-index: 1;
  pointer-events: none;
}

@keyframes glowBreathe {
  0%, 100% { opacity: .8;  transform: translateX(-50%) scale(1); }
  50%      { opacity: 1;   transform: translateX(-50%) scale(1.07); }
}
@media (prefers-reduced-motion: reduce) {
  .solution::before { animation: none; }
}

/* ---------- Pillars ---------- */
.pillars { padding: 100px 0; border-top: 1px solid var(--border); }
.pillars__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pillar {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 30px 32px;
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.pillar:hover { transform: translateY(-4px); border-color: rgba(94,243,140,.4); background: var(--surface-2); }
.pillar__num { font-family: var(--font-display); font-size: .85rem; color: var(--dim); letter-spacing: .1em; }
.pillar__icon { position: absolute; top: 30px; right: 30px; color: var(--accent); font-size: 1.8rem; font-weight: 700; line-height: 1; }
.pillar h3 { font-size: 1.55rem; margin: 16px 0 12px; }
.pillar p { color: var(--muted); font-size: 1.02rem; }

/* ---------- Quotes ---------- */
.quotes { padding: 100px 0; border-top: 1px solid var(--border); }
.quotes__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.quote { margin: 0; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 38px 34px; }
.quote blockquote { margin: 0 0 24px; font-family: var(--font-display); font-weight: 500; font-size: 1.32rem; line-height: 1.45; letter-spacing: -0.01em; }
.quote figcaption { display: flex; flex-direction: column; gap: 2px; }
.quote__name { font-weight: 600; }
.quote__role { color: var(--accent); font-size: .92rem; }

/* ---------- Stats ---------- */
.stats { padding: 90px 0; border-top: 1px solid var(--border); }
.stats__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 860px; margin: 0 auto; }
.stat { text-align: center; }
.stat__num { display: block; font-family: var(--font-display); font-weight: 700; font-size: clamp(2.2rem, 4vw, 3.2rem); color: var(--accent); letter-spacing: -0.03em; }
.stat__label { color: var(--muted); font-size: .95rem; }

/* ---------- FAQ ---------- */
.faq { padding: 100px 0; border-top: 1px solid var(--border); }
.faq__list { margin-top: 12px; }
.faq__item { border-bottom: 1px solid var(--border); }
.faq__q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 20px;
  background: none; border: 0; cursor: pointer; text-align: left;
  font-family: var(--font-display); font-weight: 600; font-size: 1.18rem; color: var(--text);
  padding: 26px 4px;
}
.faq__q:hover { color: var(--accent); }
.faq__icon { position: relative; flex: 0 0 18px; width: 18px; height: 18px; }
.faq__icon::before, .faq__icon::after { content: ""; position: absolute; background: var(--accent); border-radius: 2px; transition: transform .25s var(--ease); }
.faq__icon::before { top: 8px; left: 0; width: 18px; height: 2px; }
.faq__icon::after { top: 0; left: 8px; width: 2px; height: 18px; }
.faq__q[aria-expanded="true"] .faq__icon::after { transform: scaleY(0); }
.faq__a { overflow: hidden; max-height: 0; transition: max-height .3s var(--ease); }
.faq__a p { color: var(--muted); padding: 0 4px 26px; font-size: 1.05rem; }

/* ---------- CTA ---------- */
.cta { padding: 130px 0; border-top: 1px solid var(--border); }
.cta__title { font-size: clamp(2.1rem, 5.5vw, 4rem); }
.cta__lead { color: var(--muted); font-size: 1.2rem; max-width: 560px; margin: 24px auto 40px; }

/* ---------- Contact form ---------- */
.contact { max-width: 560px; margin: 0 auto; text-align: left; }
.contact__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: block; margin-bottom: 16px; }
.field > span { display: block; font-size: .9rem; font-weight: 600; color: var(--muted); margin-bottom: 8px; }
.field > span em { color: var(--dim); font-style: normal; font-weight: 400; }
.field input, .field textarea {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
  resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: var(--dim); }
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(94,243,140,.15);
}
.field input:user-invalid, .field textarea:user-invalid { border-color: #ff6b6b; }
.contact__hp { position: absolute; left: -9999px; opacity: 0; height: 0; width: 0; }
.contact__submit { width: 100%; margin-top: 8px; }
.contact__submit[disabled] { opacity: .6; cursor: progress; }
.contact__status { min-height: 22px; margin-top: 14px; text-align: center; font-size: .98rem; }
.contact__status.is-error { color: #ff8585; }
.contact__status.is-success { color: var(--accent); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 70px 0 40px; background: var(--bg-2); }
.footer__inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer__tag { color: var(--muted); margin-top: 16px; max-width: 280px; }
.footer__col h4 { font-size: .85rem; text-transform: uppercase; letter-spacing: .12em; color: var(--dim); margin-bottom: 18px; font-family: var(--font-body); }
.footer__col a { display: block; color: var(--muted); padding: 6px 0; font-size: .98rem; transition: color .2s var(--ease); }
.footer__col a:hover { color: var(--accent); }
.footer__bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 56px; padding-top: 28px; border-top: 1px solid var(--border); color: var(--dim); font-size: .9rem; }

/* ---------- Legal pages ---------- */
.legal { padding: 56px 0 90px; }
.legal__back { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); margin-bottom: 30px; font-size: .95rem; }
.legal__back:hover { color: var(--accent); }
.legal__head { max-width: 760px; margin: 0 auto 18px; }
.legal__head h1 { font-size: clamp(2.1rem, 5vw, 3.1rem); }
.legal__updated { color: var(--dim); margin-top: 14px; font-size: .95rem; }
.legal__note { max-width: 760px; margin: 24px auto 40px; padding: 16px 18px; background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: var(--radius-sm); color: var(--muted); font-size: .95rem; }
.legal__body { max-width: 760px; margin: 0 auto; }
.legal__body h2 { font-size: 1.4rem; margin: 42px 0 14px; }
.legal__body h3 { font-size: 1.1rem; margin: 26px 0 10px; }
.legal__body p, .legal__body li { color: var(--muted); font-size: 1.05rem; }
.legal__body p { margin-bottom: 16px; }
.legal__body ul { margin: 0 0 16px; padding-left: 22px; }
.legal__body li { margin-bottom: 8px; }
.legal__body a { color: var(--accent); }
.legal__body strong { color: var(--text); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ---------- Responsive ---------- */
@media (max-width: 940px) {
  .pillars__grid { grid-template-columns: 1fr; }
  .quotes__grid { grid-template-columns: 1fr; }
  .stats__grid { grid-template-columns: 1fr; row-gap: 40px; max-width: 360px; }
  .footer__inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .nav__mobile { display: none; }
  .nav__mobile[data-open="true"] { display: flex; }
  .hero { padding: 64px 0 40px; }
  .problem, .solution, .pillars, .quotes, .stats, .faq { padding-top: 72px; padding-bottom: 72px; }
  .cta { padding: 90px 0; }
  .contact__row { grid-template-columns: 1fr; gap: 0; }
}
@media (max-width: 460px) {
  .stats__grid { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; gap: 32px; }
}