/* ============ Tokens ============ */
:root {
  --font-display: 'Outfit', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --violet: #7C3AED;
  --violet-lite: #9F67FF;
  --cyan: #22D3EE;
  --cyan-lite: #38BDF8;

  --radius: 16px;
  --maxw: 1180px;

  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark (default) */
[data-theme="dark"] {
  --bg: #07060c;
  --bg-2: #0d0b16;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #ECEAF3;
  --text-dim: #a5a1b8;
  --text-faint: #6f6b83;
  --glow-op: 0.5;
  --grid-op: 0.04;
}

/* Light */
[data-theme="light"] {
  --bg: #f6f5fb;
  --bg-2: #ffffff;
  --surface: rgba(20, 15, 40, 0.025);
  --surface-hover: rgba(20, 15, 40, 0.05);
  --border: rgba(20, 15, 40, 0.1);
  --border-strong: rgba(20, 15, 40, 0.18);
  --text: #16121f;
  --text-dim: #4b465c;
  --text-faint: #7a7589;
  --glow-op: 0.22;
  --grid-op: 0.05;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.5s var(--ease), color 0.4s var(--ease);
}

a { color: inherit; text-decoration: none; }

/* ============ Background field ============ */
.bg-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 45%, var(--bg) 100%);
}
.bg-field::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--text) 1px, transparent 1px),
    linear-gradient(90deg, var(--text) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: var(--grid-op);
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 75%);
}
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: var(--glow-op);
  will-change: transform;
}
.bg-glow--violet {
  width: 620px; height: 620px;
  background: radial-gradient(circle, var(--violet), transparent 66%);
  top: -220px; left: -120px;
  animation: drift1 22s ease-in-out infinite alternate;
}
.bg-glow--cyan {
  width: 540px; height: 540px;
  background: radial-gradient(circle, var(--cyan), transparent 66%);
  top: -120px; right: -140px;
  animation: drift2 26s ease-in-out infinite alternate;
}
@keyframes drift1 {
  to { transform: translate(120px, 90px) scale(1.15); }
}
@keyframes drift2 {
  to { transform: translate(-90px, 120px) scale(1.1); }
}
#particles { position: absolute; inset: 0; width: 100%; height: 100%; }

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
}
.btn--primary {
  background: linear-gradient(120deg, var(--violet), var(--cyan));
  color: #fff;
  box-shadow: 0 8px 30px -8px rgba(124, 58, 237, 0.6);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -8px rgba(124, 58, 237, 0.75); }
.btn--ghost {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn--ghost:hover { background: var(--surface-hover); transform: translateY(-2px); border-color: var(--violet); }

/* ============ Header ============ */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: 1rem clamp(1.2rem, 5vw, 3rem);
  background: transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease), padding 0.35s var(--ease);
  border-bottom: 1px solid transparent;
}
.header--scrolled {
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 0.6rem; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.mark-a { stroke: var(--violet); }
.mark-b { stroke: var(--cyan); }
.mark-node { fill: var(--text); }
.mark-node-dim { fill: var(--text-faint); }

.nav { display: flex; gap: var(--space-8); }
.nav a {
  font-size: 0.92rem;
  color: var(--text-dim);
  position: relative;
  transition: color 0.2s var(--ease);
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  transition: width 0.3s var(--ease);
}
.nav a:hover { color: var(--text); }
.nav a:hover::after { width: 100%; }

.header__actions { display: flex; align-items: center; gap: 0.8rem; }
.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.theme-toggle:hover { background: var(--surface-hover); border-color: var(--violet); transform: rotate(15deg); }
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ============ Layout / sections ============ */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(1.2rem, 5vw, 3rem); }
.section { padding: clamp(4rem, 10vw, 8rem) 0; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--violet-lite);
  margin-bottom: 1rem;
}
[data-theme="light"] .eyebrow { color: var(--violet); }
.section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
}
.section__head { max-width: 640px; margin-bottom: var(--space-16); }
.section__lead, .section__head .section__lead {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-top: 1rem;
}

/* ============ Hero ============ */
.hero {
  min-height: 88vh;
  display: flex;
  align-items: center;
  padding: 6rem 0 4rem;
}
.hero__inner { max-width: 860px; }
.hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 7vw, 5rem);
  line-height: 1.03;
  letter-spacing: -0.04em;
  margin-bottom: 1.6rem;
}
.grad-text {
  background: linear-gradient(110deg, var(--violet-lite) 10%, var(--cyan) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.hero__sub {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-dim);
  max-width: 620px;
  margin-bottom: 2.4rem;
}
.hero__cta { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ============ Services cards ============ */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.4rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.8rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), background 0.35s var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}
.card:hover { transform: translateY(-6px); background: var(--surface-hover); }
.card:hover::before { opacity: 1; }
.card__icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  border-radius: 13px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--violet) 22%, transparent), color-mix(in srgb, var(--cyan) 22%, transparent));
  color: var(--violet-lite);
  margin-bottom: 1.4rem;
}
[data-theme="light"] .card__icon { color: var(--violet); }
.card__icon svg { width: 26px; height: 26px; }
.card__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}
.card__body { color: var(--text-dim); font-size: 0.97rem; }
.card__body a { color: var(--cyan-lite); border-bottom: 1px solid transparent; transition: border-color 0.2s; }
.card__body a:hover { border-color: currentColor; }

/* ============ About ============ */
.about__grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}
.about__visual {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  color: var(--text-faint);
  position: relative;
  overflow: hidden;
}
.about__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 55%, color-mix(in srgb, var(--violet) 18%, transparent), transparent 60%);
}
.canyon { width: 62%; height: auto; position: relative; z-index: 1; }
.about__text p { color: var(--text-dim); margin-top: 1.1rem; max-width: 52ch; }
.about__text strong { color: var(--text); font-weight: 600; }
.link-accent {
  color: var(--cyan-lite);
  font-weight: 500;
  border-bottom: 1px solid color-mix(in srgb, var(--cyan-lite) 40%, transparent);
  transition: border-color 0.2s;
}
.link-accent:hover { border-color: var(--cyan-lite); }

/* ============ Contact ============ */
.contact__inner { text-align: center; max-width: 640px; margin: 0 auto; }
.contact__lead { color: var(--text-dim); font-size: 1.05rem; margin: 1rem auto 1.8rem; }
.mail-link {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
  background: linear-gradient(110deg, var(--violet-lite), var(--cyan));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  transition: opacity 0.2s;
}
.mail-link:hover { opacity: 0.8; }

/* ============ Footer ============ */
.footer {
  border-top: 1px solid var(--border);
  margin-top: var(--space-16);
}
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.4rem clamp(1.2rem, 5vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer__brand {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-display); font-weight: 700; font-size: 1.05rem;
}
.footer__meta { color: var(--text-faint); font-size: 0.9rem; }
.footer__meta a { color: var(--cyan-lite); }
.footer__meta a:hover { text-decoration: underline; }

/* ============ Reveal on scroll ============ */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ============ Responsive ============ */
@media (max-width: 820px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__visual { max-width: 320px; }
  .nav { display: none; }
}
@media (max-width: 560px) {
  .header__cta { display: none; }
  .hero { min-height: 82vh; }
}

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