/* HelixAI — helixai.one */
:root {
  --violet: #7C3AED;
  --space: #0F172A;
  --cyan: #06B6D4;
  --lavender: #EDE9FE;
  --text: #F1F5F9;
  --muted: #94A3B8;
  --glass: rgba(15, 23, 42, 0.72);
  --glass-border: rgba(237, 233, 254, 0.12);
  --radius: 14px;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --max: 1180px;
  --header-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html:not(.js) .animate-on-scroll { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .animate-on-scroll { opacity: 1 !important; transform: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--space);
  min-height: 100vh;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--cyan); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--lavender); }
a:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.75em;
}
h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: 1.35rem; }
p { margin: 0 0 1em; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 10000;
  padding: 0.75rem 1.25rem;
  background: var(--violet);
  color: var(--text);
}
.skip-link:focus { left: 1rem; top: 1rem; }

.container { width: min(100% - 2.5rem, var(--max)); margin-inline: auto; }

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.logo span { color: var(--cyan); }
.logo:hover { color: var(--lavender); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
}
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.75rem;
  align-items: center;
}
.main-nav a {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.95rem;
}
.main-nav a:hover,
.main-nav a[aria-current="page"] { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  color: var(--text);
  box-shadow: 0 4px 24px rgba(124, 58, 237, 0.35);
}
.btn-primary:hover {
  color: var(--text);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(6, 182, 212, 0.4);
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--glass-border);
}
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); }

main { padding-top: var(--header-h); }

/* Hero diagonal */
.hero-diagonal {
  position: relative;
  min-height: 88vh;
  display: grid;
  align-items: center;
  overflow: hidden;
}
.hero-diagonal::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.15) 0%, transparent 45%),
    linear-gradient(225deg, rgba(6, 182, 212, 0.12) 0%, transparent 50%);
  z-index: 0;
}
.hero-diagonal::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 120px;
  background: var(--space);
  clip-path: polygon(0 40%, 100% 0, 100% 100%, 0 100%);
  z-index: 2;
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 4rem 0 6rem;
}
.hero-copy .tagline {
  font-family: var(--font-display);
  color: var(--cyan);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.hero-copy .lead { font-size: 1.15rem; color: var(--muted); max-width: 32ch; }
.hero-visual {
  position: relative;
}
.hero-helix {
  width: 100%;
  aspect-ratio: 1;
  max-width: 420px;
  margin-left: auto;
  border-radius: var(--radius);
  overflow: hidden;
  transform: skewY(-3deg) rotate(-2deg);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
  border: 1px solid var(--glass-border);
}
.hero-helix img { width: 100%; height: 100%; object-fit: cover; }
.hero-helix-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, transparent 30%, rgba(124, 58, 237, 0.35));
  pointer-events: none;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2rem; }

/* Stats strip */
.stats-strip {
  background: rgba(124, 58, 237, 0.08);
  border-block: 1px solid var(--glass-border);
  padding: 2.5rem 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}
.stat-value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--lavender), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-label { color: var(--muted); font-size: 0.9rem; margin: 0; }

/* Sections */
.section { padding: 5rem 0; }
.section-header { text-align: center; max-width: 640px; margin: 0 auto 3rem; }
.section-header p { color: var(--muted); margin-bottom: 0; }
.section-label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 0.75rem;
}

/* Glass cards */
.card-grid {
  display: grid;
  gap: 1.5rem;
}
.card-grid-4 { grid-template-columns: repeat(4, 1fr); }
.card-grid-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid-2 { grid-template-columns: repeat(2, 1fr); }

.glass-card {
  background: var(--glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.25s, transform 0.25s;
}
.glass-card:hover {
  border-color: rgba(6, 182, 212, 0.35);
  transform: translateY(-4px);
}
.glass-card .price {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--cyan);
  margin: 1rem 0 0.5rem;
}
.glass-card .price small { font-size: 0.85rem; color: var(--muted); font-weight: 400; }
.glass-card ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.glass-card .code {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--violet);
  letter-spacing: 0.05em;
}

/* Tech stack */
.tech-strip {
  padding: 3rem 0;
  background: linear-gradient(90deg, rgba(124, 58, 237, 0.06), rgba(6, 182, 212, 0.06));
  border-block: 1px solid var(--glass-border);
}
.tech-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem 3rem;
  align-items: center;
}
.tech-item {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--muted);
  padding: 0.5rem 1rem;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
}

/* Why grid */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.why-item {
  padding: 1.5rem;
  border-left: 3px solid var(--violet);
  background: rgba(237, 233, 254, 0.03);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.why-item h3 { color: var(--lavender); font-size: 1.1rem; }

/* Full bleed CTA */
.cta-bleed {
  position: relative;
  min-height: 380px;
  display: flex;
  align-items: center;
  margin: 3rem 0;
}
.cta-bleed-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}
.cta-bleed-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, var(--space) 25%, rgba(15, 23, 42, 0.75) 55%, rgba(124, 58, 237, 0.25));
}
.cta-bleed-content {
  position: relative;
  z-index: 1;
  max-width: 520px;
  padding: 3rem 0;
}

/* Testimonials */
.testimonial-card blockquote {
  margin: 0;
  font-style: italic;
  color: var(--lavender);
  font-size: 1.05rem;
}
.testimonial-card cite {
  display: block;
  margin-top: 1rem;
  font-style: normal;
  font-size: 0.9rem;
  color: var(--muted);
}
.testimonial-card cite strong { color: var(--text); }

/* CTA band */
.cta-band {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.2), rgba(6, 182, 212, 0.15));
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  margin: 2rem 0;
}

/* Page hero (inner) */
.page-hero {
  padding: 4rem 0 3rem;
  background: linear-gradient(180deg, rgba(124, 58, 237, 0.12), transparent);
}
.page-hero.diagonal-cut::after {
  content: "";
  display: block;
  height: 60px;
  margin-top: 2rem;
  background: var(--space);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 60%);
  margin-bottom: -60px;
}

/* Product cards */
.product-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.5rem;
  align-items: start;
}
.product-card img {
  width: 140px;
  height: 100px;
  object-fit: cover;
  border-radius: 10px;
}
.product-meta { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.5rem; }
.badge {
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  background: rgba(124, 58, 237, 0.25);
  color: var(--lavender);
  font-family: var(--font-display);
}

/* Forms */
.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 500;
  font-size: 0.9rem;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
}
.form-group input.invalid,
.form-group textarea.invalid { border-color: #f87171; }
.field-error {
  color: #f87171;
  font-size: 0.85rem;
  margin-top: 0.35rem;
  display: none;
}
.field-error.visible { display: block; }
.form-success {
  padding: 1rem;
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid var(--cyan);
  border-radius: 10px;
  display: none;
}
.form-success.visible { display: block; }

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: start;
}
.contact-info p { color: var(--muted); margin-bottom: 0.5rem; }
.contact-info a { color: var(--text); }

/* Legal */
.legal-content {
  max-width: 780px;
  margin: 0 auto;
}
.legal-content h2 { margin-top: 2.5rem; font-size: 1.35rem; }
.legal-content h3 { font-size: 1.1rem; margin-top: 1.5rem; }
.legal-content ul { color: var(--muted); padding-left: 1.5rem; }
.legal-content li { margin-bottom: 0.5rem; }

/* Footer */
.site-footer {
  margin-top: 4rem;
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--glass-border);
  background: rgba(0, 0, 0, 0.2);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
.footer-grid h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 1rem;
}
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 0.5rem; }
.footer-grid a { color: var(--muted); font-size: 0.9rem; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--glass-border);
  font-size: 0.85rem;
  color: var(--muted);
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 9999;
  padding: 1.25rem;
  background: rgba(15, 23, 42, 0.96);
  border-top: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  transform: translateY(100%);
  transition: transform 0.35s ease;
}
.cookie-banner.visible { transform: translateY(0); }
.cookie-inner {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.cookie-inner p { margin: 0; font-size: 0.9rem; color: var(--muted); max-width: 52ch; }
.cookie-actions { display: flex; gap: 0.75rem; flex-shrink: 0; }

/* Scroll animations */
.js .animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.js .animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Team / about */
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.team-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-helix { margin: 0 auto; max-width: 360px; }
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    padding: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
  }
  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .main-nav ul { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .card-grid-4,
  .card-grid-3,
  .card-grid-2,
  .why-grid,
  .team-grid,
  .contact-layout,
  .footer-grid { grid-template-columns: 1fr; }
  .product-card { grid-template-columns: 1fr; }
  .product-card img { width: 100%; height: 160px; }
  .stats-grid { grid-template-columns: 1fr; }
}