/* ============================================================
   Qentis AI — styles.css
   Dark premium · Swiss minimalism · deep blue / black / white
   ============================================================ */

:root {
  /* Palette */
  --bg:            #05070d;
  --bg-alt:        #070a12;
  --bg-elev:       #0b0f1a;
  --ink:           #eef2fb;
  --ink-soft:      #aab4cc;
  --ink-mut:       #6b7690;
  --line:          rgba(140, 160, 205, 0.12);
  --line-strong:   rgba(140, 160, 205, 0.22);

  --blue:          #2f6bff;
  --blue-bright:   #4d8bff;
  --cyan:          #35e0e6;
  --violet:        #7b5cff;
  --accent-grad:   linear-gradient(120deg, #4d8bff 0%, #35e0e6 100%);

  /* Type */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Space Grotesk", var(--font-sans);
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;

  --maxw: 1200px;
  --radius: 16px;
  --radius-sm: 10px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: var(--blue); color: #fff; padding: 12px 18px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

::selection { background: rgba(77, 139, 255, 0.32); color: #fff; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }

/* ---------- Shared type ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink-soft); margin-bottom: 22px;
}
.eyebrow__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }

.grad {
  background: var(--accent-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.section__title {
  font-family: var(--font-display);
  font-weight: 600; letter-spacing: -0.02em; line-height: 1.08;
  font-size: clamp(1.9rem, 4vw, 3rem);
  color: var(--ink); margin-bottom: 20px; max-width: 20ch;
}
.section__lede { color: var(--ink-soft); font-size: clamp(1rem, 1.4vw, 1.16rem); max-width: 62ch; }
.section__head { margin-bottom: 64px; }

/* ---------- Buttons ---------- */
.btn {
  --pad-y: 14px; --pad-x: 26px;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: var(--pad-y) var(--pad-x);
  font-family: var(--font-sans); font-weight: 550; font-size: 0.96rem;
  border-radius: 100px; border: 1px solid transparent; cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.35s var(--ease), background 0.3s, border-color 0.3s;
  will-change: transform;
}
.btn__arrow { transition: transform 0.3s var(--ease); }
.btn:hover .btn__arrow { transform: translateX(4px); }
.btn--sm { --pad-y: 10px; --pad-x: 18px; font-size: 0.86rem; }
.btn--lg { --pad-y: 17px; --pad-x: 32px; font-size: 1.02rem; }

.btn--primary {
  background: linear-gradient(120deg, var(--blue) 0%, var(--blue-bright) 100%);
  color: #fff; box-shadow: 0 8px 30px -8px rgba(47, 107, 255, 0.6);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 44px -10px rgba(77, 139, 255, 0.75); }
.btn--ghost {
  background: rgba(255, 255, 255, 0.02); color: var(--ink);
  border-color: var(--line-strong); backdrop-filter: blur(8px);
}
.btn--ghost:hover { border-color: rgba(77, 139, 255, 0.55); background: rgba(77, 139, 255, 0.08); transform: translateY(-2px); }

/* ---------- Navigation ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background 0.4s, border-color 0.4s, backdrop-filter 0.4s;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(5, 7, 13, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom-color: var(--line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 74px; gap: 24px; }

.brand { display: inline-flex; align-items: center; gap: 11px; font-family: var(--font-display); font-weight: 600; font-size: 1.18rem; letter-spacing: -0.01em; }
.brand__mark { color: var(--cyan); display: inline-flex; }
.brand__name { color: var(--ink); }
.brand__ai { color: var(--cyan); margin-left: 2px; }

.nav__links { display: flex; gap: 30px; }
.nav__links a { font-size: 0.9rem; color: var(--ink-soft); transition: color 0.25s; position: relative; }
.nav__links a::after { content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 1.5px; background: var(--accent-grad); transition: width 0.3s var(--ease); }
.nav__links a:hover { color: var(--ink); }
.nav__links a:hover::after { width: 100%; }

.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(--ink); border-radius: 2px; transition: 0.3s var(--ease); }
.nav__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open span:nth-child(2) { opacity: 0; }
.nav__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav__mobile {
  display: none; flex-direction: column; gap: 4px; padding: 8px 24px 22px;
  background: rgba(7, 10, 18, 0.96); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  max-height: 0; overflow: hidden; transition: max-height 0.4s var(--ease);
}
.nav__mobile a { padding: 13px 4px; color: var(--ink-soft); border-bottom: 1px solid var(--line); }
.nav__mobile a.btn { margin-top: 14px; border-bottom: 0; color: #fff; justify-content: center; }
.nav__mobile.is-open { max-height: 460px; }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center; overflow: hidden; padding: 120px 0 80px; }
.hero__canvas { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; opacity: 0.8; }
.hero__grid {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 78%);
}
.hero__glow {
  position: absolute; z-index: 0; top: -10%; left: 50%; transform: translateX(-50%);
  width: 900px; height: 700px; pointer-events: none;
  background: radial-gradient(circle at 50% 40%, rgba(47, 107, 255, 0.28), transparent 62%);
  filter: blur(30px);
}
.hero__inner { position: relative; z-index: 2; text-align: center; max-width: 900px; margin-inline: auto; }
.hero__inner .eyebrow { justify-content: center; }

.hero__title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.5rem, 7vw, 5rem); line-height: 1.02; letter-spacing: -0.035em;
  margin-bottom: 26px;
}
.hero__sub { color: var(--ink-soft); font-size: clamp(1.05rem, 1.7vw, 1.3rem); max-width: 60ch; margin: 0 auto 40px; }
.hero__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 64px; }

.hero__stats { display: flex; gap: 44px; justify-content: center; flex-wrap: wrap; padding-top: 40px; border-top: 1px solid var(--line); max-width: 760px; margin-inline: auto; }
.hero__stats div { text-align: center; }
.hero__stats dt { font-family: var(--font-display); font-weight: 600; font-size: 1.35rem; color: var(--ink); margin-bottom: 4px; }
.hero__stats dd { font-size: 0.82rem; color: var(--ink-mut); max-width: 22ch; }

.hero__scroll { position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%); z-index: 2; width: 24px; height: 40px; border: 1.5px solid var(--line-strong); border-radius: 14px; display: flex; justify-content: center; padding-top: 8px; }
.hero__scroll span { width: 4px; height: 8px; border-radius: 4px; background: var(--cyan); animation: scrollDot 1.8s var(--ease) infinite; }
@keyframes scrollDot { 0% { opacity: 0; transform: translateY(-4px); } 40% { opacity: 1; } 80%, 100% { opacity: 0; transform: translateY(12px); } }

/* ---------- Sections ---------- */
.section { padding: clamp(80px, 12vw, 140px) 0; position: relative; }
.section--alt { background: var(--bg-alt); border-block: 1px solid var(--line); }

/* Problem */
.problem__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.pcard {
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px 30px; transition: transform 0.4s var(--ease), border-color 0.4s, background 0.4s;
  position: relative; overflow: hidden;
}
.pcard::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 2px; background: var(--accent-grad); transform: scaleY(0); transform-origin: top; transition: transform 0.4s var(--ease); }
.pcard:hover { transform: translateY(-4px); border-color: var(--line-strong); background: #0d1220; }
.pcard:hover::before { transform: scaleY(1); }
.pcard__idx { font-family: var(--font-mono); font-size: 0.8rem; color: var(--blue-bright); letter-spacing: 0.1em; }
.pcard h3 { font-family: var(--font-display); font-weight: 500; font-size: 1.18rem; margin: 14px 0 10px; letter-spacing: -0.01em; }
.pcard p { color: var(--ink-soft); font-size: 0.95rem; }

.problem__note {
  margin-top: 44px; padding: 30px 34px; border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(47,107,255,0.06), rgba(47,107,255,0.01));
  border: 1px solid var(--line); color: var(--ink-soft);
  font-size: 1.06rem; max-width: 80ch;
}
.problem__note em { color: var(--cyan); font-style: normal; font-weight: 500; }

/* Flow / architecture */
.flow { display: flex; align-items: stretch; gap: 0; flex-wrap: wrap; }
.flow__node {
  flex: 1 1 200px; background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 24px; position: relative;
  transition: transform 0.4s var(--ease), border-color 0.4s, box-shadow 0.4s;
}
.flow__node:hover { transform: translateY(-5px); border-color: rgba(77,139,255,0.4); box-shadow: 0 20px 50px -24px rgba(47,107,255,0.6); }
.flow__tag { font-family: var(--font-mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.16em; color: var(--cyan); }
.flow__node h3 { font-family: var(--font-display); font-weight: 500; font-size: 1.1rem; margin: 12px 0 8px; letter-spacing: -0.01em; }
.flow__node p { color: var(--ink-soft); font-size: 0.88rem; }
.flow__node--engine { border-color: rgba(77,139,255,0.35); background: linear-gradient(180deg, rgba(47,107,255,0.09), var(--bg-elev)); }

.flow__link { flex: 0 0 40px; display: flex; align-items: center; justify-content: center; }
.flow__link span { width: 100%; height: 1.5px; background: linear-gradient(90deg, transparent, var(--blue-bright), transparent); position: relative; }
.flow__link span::after { content: "▶"; position: absolute; right: -2px; top: 50%; transform: translateY(-50%); color: var(--blue-bright); font-size: 0.6rem; }

.flow__return { display: flex; align-items: center; gap: 20px; margin-top: 28px; padding: 26px 30px; border: 1px dashed var(--line-strong); border-radius: var(--radius); background: rgba(255,255,255,0.015); }
.flow__return-arrow { font-size: 1.8rem; color: var(--cyan); flex-shrink: 0; }
.flow__return p { color: var(--ink-soft); font-size: 1rem; }
.flow__return strong { color: var(--ink); font-weight: 550; }

/* Platform pillars */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pillar {
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 40px 34px; transition: transform 0.4s var(--ease), border-color 0.4s, box-shadow 0.4s;
  display: flex; flex-direction: column;
}
.pillar:hover { transform: translateY(-6px); border-color: var(--line-strong); box-shadow: 0 26px 60px -30px rgba(0,0,0,0.9); }
.pillar--featured { border-color: rgba(77,139,255,0.32); background: linear-gradient(185deg, rgba(47,107,255,0.08), var(--bg-elev) 60%); }
.pillar--featured:hover { box-shadow: 0 30px 70px -30px rgba(47,107,255,0.55); }
.pillar__icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; color: var(--cyan); background: rgba(53,224,230,0.07); border: 1px solid rgba(53,224,230,0.18); margin-bottom: 24px; }
.pillar__icon svg { width: 30px; height: 30px; }
.pillar__label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-mut); }
.pillar h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.4rem; margin: 8px 0 14px; letter-spacing: -0.02em; }
.pillar > p { color: var(--ink-soft); font-size: 0.96rem; margin-bottom: 22px; }
.pillar__list { margin-top: auto; display: flex; flex-direction: column; gap: 12px; }
.pillar__list li { position: relative; padding-left: 24px; color: var(--ink-soft); font-size: 0.9rem; }
.pillar__list li::before { content: ""; position: absolute; left: 0; top: 8px; width: 12px; height: 12px; border-radius: 3px; background: var(--accent-grad); opacity: 0.85; }

/* Use cases */
.uc__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.uc {
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 30px; transition: transform 0.4s var(--ease), border-color 0.4s, background 0.4s;
}
.uc:hover { transform: translateY(-5px); border-color: rgba(77,139,255,0.35); background: #0d1220; }
.uc__icon { font-size: 1.5rem; color: var(--cyan); width: 52px; height: 52px; border-radius: 12px; display: flex; align-items: center; justify-content: center; background: rgba(53,224,230,0.06); border: 1px solid rgba(53,224,230,0.16); margin-bottom: 22px; }
.uc h3 { font-family: var(--font-display); font-weight: 500; font-size: 1.22rem; letter-spacing: -0.01em; margin-bottom: 10px; }
.uc p { color: var(--ink-soft); font-size: 0.93rem; margin-bottom: 18px; }
.uc__sector { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--ink-mut); text-transform: uppercase; }

/* Switzerland */
.swiss { overflow: hidden; }
.swiss__inner { display: grid; grid-template-columns: 1.35fr 1fr; gap: 60px; align-items: center; }
.swiss__points { display: grid; grid-template-columns: 1fr 1fr; gap: 28px 32px; margin-top: 40px; }
.swiss__point h3 { font-family: var(--font-display); font-weight: 500; font-size: 1.08rem; margin-bottom: 8px; color: var(--ink); }
.swiss__point p { color: var(--ink-soft); font-size: 0.92rem; }

.swiss__emblem { position: relative; aspect-ratio: 1; display: flex; align-items: center; justify-content: center; }
.swiss__cross { position: relative; width: 120px; height: 120px; z-index: 2; }
.swiss__cross span { position: absolute; background: var(--ink); border-radius: 4px; box-shadow: 0 0 40px rgba(238,242,251,0.25); }
.swiss__cross span:nth-child(1) { width: 34px; height: 108px; left: 50%; top: 50%; transform: translate(-50%,-50%); }
.swiss__cross span:nth-child(2) { width: 108px; height: 34px; left: 50%; top: 50%; transform: translate(-50%,-50%); }
.swiss__rings { position: absolute; inset: 0; border-radius: 50%; }
.swiss__rings::before, .swiss__rings::after { content: ""; position: absolute; inset: 0; margin: auto; border: 1px solid var(--line-strong); border-radius: 50%; }
.swiss__rings::before { width: 78%; height: 78%; animation: spin 26s linear infinite; border-style: dashed; }
.swiss__rings::after { width: 100%; height: 100%; border-color: rgba(77,139,255,0.18); animation: spin 40s linear infinite reverse; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Trust */
.trust__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.tcard { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 28px; transition: transform 0.4s var(--ease), border-color 0.4s; }
.tcard:hover { transform: translateY(-4px); border-color: var(--line-strong); }
.tcard h3 { font-family: var(--font-display); font-weight: 500; font-size: 1.12rem; margin-bottom: 10px; letter-spacing: -0.01em; }
.tcard h3::before { content: "→ "; color: var(--cyan); }
.tcard p { color: var(--ink-soft); font-size: 0.92rem; }
.trust__disclaimer { margin-top: 40px; padding: 28px 32px; border-radius: var(--radius); border: 1px solid var(--line-strong); background: rgba(123,92,255,0.05); color: var(--ink-soft); font-size: 0.98rem; max-width: 90ch; }
.trust__disclaimer strong { color: var(--ink); display: inline; }
.trust__disclaimer em { color: var(--cyan); font-style: normal; font-weight: 500; }

/* CTA */
.cta { position: relative; padding: clamp(90px, 13vw, 150px) 0; overflow: hidden; background: linear-gradient(180deg, var(--bg) 0%, #070d1f 55%, var(--bg) 100%); border-top: 1px solid var(--line); }
.cta__grid { position: absolute; inset: 0; background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 52px 52px; mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000, transparent 75%); -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000, transparent 75%); }
.cta__inner { position: relative; z-index: 2; text-align: center; max-width: 760px; margin-inline: auto; }
.cta__title { font-family: var(--font-display); font-weight: 700; font-size: clamp(2rem, 5vw, 3.4rem); letter-spacing: -0.03em; line-height: 1.05; margin-bottom: 22px; }
.cta__sub { color: var(--ink-soft); font-size: clamp(1rem, 1.5vw, 1.18rem); margin-bottom: 38px; }
.cta__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta__meta { margin-top: 26px; font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.05em; color: var(--ink-mut); }

/* Footer */
.footer { background: var(--bg-alt); border-top: 1px solid var(--line); padding: 72px 0 32px; }
.footer__inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 48px; border-bottom: 1px solid var(--line); }
.footer__tagline { color: var(--ink-mut); font-size: 0.9rem; margin-top: 18px; max-width: 34ch; }
.footer__col h4 { font-family: var(--font-display); font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink); margin-bottom: 18px; }
.footer__col a { display: block; color: var(--ink-soft); font-size: 0.9rem; padding: 6px 0; transition: color 0.25s; }
.footer__col a:hover { color: var(--cyan); }
.footer__loc { color: var(--ink-mut); font-size: 0.82rem; margin-top: 12px; }
.footer__bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 26px; gap: 16px; flex-wrap: wrap; }
.footer__bottom p { color: var(--ink-mut); font-size: 0.82rem; }
.footer__fine { font-family: var(--font-mono); letter-spacing: 0.03em; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal:nth-child(2) { transition-delay: 0.05s; }
.reveal:nth-child(3) { transition-delay: 0.1s; }
.reveal:nth-child(4) { transition-delay: 0.15s; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .nav__mobile { display: flex; }
  .problem__grid, .pillars, .uc__grid, .trust__grid { grid-template-columns: repeat(2, 1fr); }
  .swiss__inner { grid-template-columns: 1fr; gap: 48px; }
  .swiss__emblem { max-width: 280px; margin-inline: auto; order: -1; }
  .footer__inner { grid-template-columns: 1fr 1fr; }
  .flow__link { flex-basis: 100%; height: 34px; transform: rotate(90deg); }
}

@media (max-width: 620px) {
  .container { padding-inline: 18px; }
  .problem__grid, .pillars, .uc__grid, .trust__grid, .swiss__points, .footer__inner { grid-template-columns: 1fr; }
  .hero__stats { gap: 26px; }
  .hero__stats dt { font-size: 1.15rem; }
  .hero__actions .btn, .cta__actions .btn { width: 100%; }
  .section__head { margin-bottom: 44px; }
  .flow__return { flex-direction: column; text-align: center; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
}