:root {
  color-scheme: dark;
  --bg: #0f172a;
  --bg-soft: #111c33;
  --surface: rgba(15, 23, 42, 0.72);
  --surface-strong: rgba(30, 41, 59, 0.92);
  --text: #f8fafc;
  --muted: #94a3b8;
  --line: rgba(148, 163, 184, 0.22);
  --primary: #4f46e5;
  --secondary: #7c3aed;
  --accent: #06b6d4;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.32);
  --radius: 8px;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f8fafc;
  --bg-soft: #eef4ff;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --text: #0f172a;
  --muted: #475569;
  --line: rgba(15, 23, 42, 0.14);
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 18% 8%, rgba(79, 70, 229, 0.28), transparent 30rem),
    radial-gradient(circle at 82% 18%, rgba(6, 182, 212, 0.18), transparent 26rem),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

body.nav-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.section { padding: 96px 0; }
.section-heading { max-width: 760px; margin-bottom: 36px; }
.section-heading h2, .hero h1, .lead-copy h2, .contact-info h2 {
  margin: 0;
  line-height: 1.04;
  letter-spacing: 0;
}
.section-heading h2 { font-size: clamp(2rem, 4vw, 3.4rem); }
.eyebrow {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 0;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 16px 34px rgba(79, 70, 229, 0.28);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 20px 44px rgba(79, 70, 229, 0.36); }
.btn-ghost { background: var(--surface); color: var(--text); border: 1px solid var(--line); box-shadow: none; }
.btn-small { min-height: 40px; padding: 0 16px; font-size: 0.9rem; }

.loader {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  background: var(--bg);
  transition: opacity 400ms ease, visibility 400ms ease;
}
.loader.hidden { opacity: 0; visibility: hidden; }
.loader-mark, .brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-weight: 900;
}
.loader-mark { width: 64px; height: 64px; animation: pulse 1s infinite alternate; }
@keyframes pulse { to { transform: scale(1.08); filter: brightness(1.2); } }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(18px);
}
.site-header.scrolled { border-color: var(--line); box-shadow: 0 10px 30px rgba(0,0,0,0.12); }
.nav { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; }
.nav-menu { display: flex; align-items: center; gap: 20px; color: var(--muted); font-weight: 700; font-size: 0.94rem; }
.nav-menu a:hover { color: var(--text); }
.theme-toggle, .nav-toggle {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius);
  cursor: pointer;
}
.theme-toggle { width: 40px; height: 40px; }
.nav-toggle { display: none; width: 44px; height: 44px; padding: 10px; }
.nav-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--text); }

.hero { min-height: calc(100vh - 78px); display: flex; align-items: center; padding-top: 78px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr); gap: 54px; align-items: center; }
.hero h1 { font-size: clamp(2.6rem, 6vw, 5.35rem); max-width: 820px; }
.hero p { color: var(--muted); font-size: 1.18rem; max-width: 660px; margin: 24px 0 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.trust-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.trust-row span {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}
.hero-visual {
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 18px;
  background: linear-gradient(145deg, rgba(255,255,255,0.11), rgba(255,255,255,0.03));
  box-shadow: var(--shadow);
  animation: float 5s ease-in-out infinite;
}
@keyframes float { 50% { transform: translateY(-12px); } }

.service-grid, .portfolio-grid, .case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.service-card, .case-card, .portfolio-card, .inquiry-form, .testimonial-wrap, .contact-info {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.service-card { padding: 28px; transition: transform 180ms ease, border-color 180ms ease; }
.service-card:hover, .portfolio-card:hover { transform: translateY(-6px); border-color: color-mix(in srgb, var(--accent), var(--line)); }
.icon {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(79,70,229,0.24), rgba(6,182,212,0.18));
  color: var(--accent);
  font-weight: 900;
}
.service-card h3, .portfolio-card h3, .case-card h3 { margin: 18px 0 10px; line-height: 1.18; }
.service-card p, .case-card p, .portfolio-card p, .lead-copy p, .contact-info p { color: var(--muted); }
.service-card ul { padding-left: 18px; color: var(--muted); }
.portfolio-card button { color: var(--accent); font-weight: 900; }

.stats { padding: 40px 0; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  background: var(--surface-strong);
}
.stats-grid div { text-align: center; }
.stats-grid strong { display: block; font-size: clamp(2.2rem, 5vw, 4rem); line-height: 1; }
.stats-grid strong::after { content: "+"; color: var(--accent); font-size: 0.55em; }
.stats-grid div:last-child strong::after { content: "%"; }
.stats-grid span { color: var(--muted); font-weight: 800; }

.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.filter-bar button {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  min-height: 40px;
  padding: 0 15px;
  cursor: pointer;
  font-weight: 800;
}
.filter-bar button.active { color: #fff; background: var(--primary); border-color: var(--primary); }
.portfolio-card { overflow: hidden; transition: transform 180ms ease, opacity 180ms ease; }
.portfolio-card.hidden { display: none; }
.portfolio-card img { width: 100%; aspect-ratio: 16 / 11; object-fit: cover; background: var(--bg-soft); }
.portfolio-card div { padding: 22px; }
.portfolio-card span, .case-card span { color: var(--accent); font-size: 0.78rem; font-weight: 900; text-transform: uppercase; letter-spacing: 0.08em; }
.portfolio-card button { padding: 0; border: 0; background: transparent; cursor: pointer; }

.case-card { padding: 28px; }
.process { background: color-mix(in srgb, var(--bg-soft) 56%, transparent); }
.timeline { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.timeline-step {
  position: relative;
  padding: 24px;
  border-left: 2px solid var(--accent);
  background: color-mix(in srgb, var(--surface-strong) 82%, transparent);
  border-radius: var(--radius);
}
.timeline-step span { color: var(--accent); font-weight: 900; }
.timeline-step p { color: var(--muted); margin-bottom: 0; }

.testimonial-wrap { position: relative; padding: 34px; overflow: hidden; }
.testimonial { display: none; grid-template-columns: 96px 1fr; gap: 24px; align-items: center; }
.testimonial.active { display: grid; }
.testimonial img { width: 96px; height: 96px; border-radius: 50%; border: 1px solid var(--line); }
.testimonial p { font-size: 1.2rem; margin: 0; }
.testimonial div { grid-column: 2; display: grid; color: var(--muted); }
.testimonial small { color: #facc15; font-size: 1rem; }
.slider-controls { position: absolute; right: 26px; bottom: 26px; display: flex; gap: 10px; }
.slider-controls button, .back-to-top, .portfolio-modal > button {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  color: var(--text);
  cursor: pointer;
}

.lead-grid { display: grid; grid-template-columns: 0.72fr 1fr; gap: 34px; align-items: start; }
.contact-grid { display: grid; place-items: center; }
.lead-copy { position: sticky; top: 120px; }
.lead-copy h2, .contact-info h2 { font-size: clamp(2rem, 4vw, 3.35rem); }
.inquiry-form { padding: 28px; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
label, legend { display: grid; gap: 8px; color: var(--text); font-weight: 800; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  color: var(--text);
  padding: 12px 13px;
  outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(6, 182, 212, 0.14); }
fieldset {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
fieldset label { display: flex; align-items: center; gap: 8px; color: var(--muted); font-weight: 700; }
fieldset input { width: auto; }
.contact-method { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.form-message { margin: 14px 0 0; color: var(--accent); font-weight: 800; }

.faq-list { display: grid; gap: 12px; }
details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 18px 20px;
}
summary { cursor: pointer; font-weight: 900; }
details p { color: var(--muted); margin-bottom: 0; }

.contact-info { width: min(720px, 100%); padding: 30px; text-align: center; }
.contact-info a { color: var(--accent); font-weight: 800; }

.footer { padding: 54px 0 28px; border-top: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 88%, #000); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 28px; }
.footer p, .footer a, .footer-bottom { color: var(--muted); }
.footer h3 { margin-top: 0; }
.footer-grid div { display: grid; align-content: start; gap: 8px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--line); }

.portfolio-modal {
  width: min(720px, calc(100% - 32px));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-strong);
  color: var(--text);
  box-shadow: var(--shadow);
  padding: 24px;
}
.portfolio-modal::backdrop { background: rgba(2, 6, 23, 0.72); backdrop-filter: blur(10px); }
.portfolio-modal > button { float: right; font-size: 1.5rem; }
.portfolio-modal img { width: 100%; border-radius: var(--radius); margin-bottom: 18px; }
.portfolio-modal p { color: var(--muted); }

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: 180ms ease;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 620ms ease, transform 620ms ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 980px) {
  .nav-toggle { display: block; }
  .nav-menu {
    position: fixed;
    inset: 78px 0 auto 0;
    display: grid;
    gap: 0;
    padding: 16px 20px 24px;
    background: var(--surface-strong);
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    transition: transform 220ms ease;
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-menu a, .theme-toggle { margin: 6px 0; }
  .hero-grid, .lead-grid { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .lead-copy { position: static; }
  .service-grid, .portfolio-grid, .case-grid, .timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats-grid, .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .container { width: min(100% - 28px, 1160px); }
  .section { padding: 70px 0; }
  .hero { padding-top: 54px; }
  .hero h1 { font-size: 2.45rem; }
  .hero-actions, .hero-actions .btn { width: 100%; }
  .service-grid, .portfolio-grid, .case-grid, .timeline, .stats-grid, .footer-grid, .form-grid, fieldset, .contact-method { grid-template-columns: 1fr; }
  .testimonial.active { grid-template-columns: 1fr; }
  .testimonial div { grid-column: auto; }
  .slider-controls { position: static; margin-top: 22px; }
  .footer-bottom { flex-direction: column; }
}