/* ---------- Design tokens ---------- */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-border: #e2e8f0;

  --color-dark: #0b0f19;
  --color-dark-alt: #131a2b;

  --color-primary: #2563eb;
  --color-primary-2: #7c3aed;
  --color-accent: #22d3ee;
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-2) 100%);

  --font-heading: 'Poppins', 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-body: 'Inter', 'Segoe UI', Helvetica, Arial, sans-serif;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6rem;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;

  --shadow-md: 0 8px 24px -8px rgba(15, 23, 42, 0.18);
  --shadow-lg: 0 24px 48px -16px rgba(15, 23, 42, 0.28);

  --max-width: 1140px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
h1, h2, h3 { font-family: var(--font-heading); line-height: 1.15; margin: 0 0 var(--space-3); }
p { margin: 0 0 var(--space-3); color: var(--color-text-muted); }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-dark);
  color: #fff;
  padding: var(--space-2) var(--space-3);
  z-index: 100;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus {
  left: 0;
}

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { box-shadow: var(--shadow-lg); }
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-sm { padding: 0.5rem 1.1rem; font-size: 0.85rem; min-height: 38px; }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}
.brand-logo { height: 48px; width: auto; color: var(--color-text); }

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin-inline: auto;
  transition: transform 0.2s ease, opacity 0.2s 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 {
  position: fixed;
  inset: 72px 0 0 0;
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-5);
  transform: translateX(100%);
  transition: transform 0.25s ease;
}
.nav.is-open { transform: translateX(0); }
.nav ul { display: flex; flex-direction: column; align-items: center; gap: var(--space-4); }
.nav a:not(.btn) {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.25rem;
}
.nav a:not(.btn):hover { color: var(--color-primary); }

@media (min-width: 768px) {
  .nav-toggle { display: none; }
  .nav {
    position: static;
    flex-direction: row;
    background: transparent;
    transform: none;
    gap: var(--space-5);
  }
  .nav ul { flex-direction: row; gap: var(--space-5); }
  .nav a:not(.btn) { font-size: 0.95rem; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: var(--color-dark);
  color: #fff;
  overflow: hidden;
  padding-block: var(--space-8) var(--space-7);
}
.hero-glow {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 140%;
  background:
    radial-gradient(45% 45% at 20% 15%, rgba(37, 99, 235, 0.45), transparent 60%),
    radial-gradient(40% 40% at 85% 25%, rgba(124, 58, 237, 0.4), transparent 60%),
    radial-gradient(30% 30% at 50% 90%, rgba(34, 211, 238, 0.2), transparent 60%);
  pointer-events: none;
}
.hero-inner { position: relative; max-width: 760px; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  color: #fff;
}
.hero-lead {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.75);
  max-width: 60ch;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-block: var(--space-5);
}
.hero .btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}
.hero .btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ---------- Sections ---------- */
.section { padding-block: var(--space-8); }
.section-alt { background: var(--color-bg-alt); }
.section-eyebrow {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}
.section h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
.section-lead { max-width: 60ch; font-size: 1.05rem; }

/* ---------- Service cards ---------- */
.card-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .card-grid { grid-template-columns: repeat(3, 1fr); }
}
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(124, 58, 237, 0.12));
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.card-icon svg { width: 24px; height: 24px; }
.card h3 { font-size: 1.15rem; }
.card p { margin-bottom: 0; font-size: 0.95rem; }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  gap: var(--space-6);
  align-items: center;
}
@media (min-width: 900px) {
  .about-grid { grid-template-columns: 1.1fr 0.9fr; }
}
.about-points { margin-top: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); }
.about-points li {
  position: relative;
  padding-left: 1.6rem;
  color: var(--color-text);
  font-weight: 500;
}
.about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-primary);
}

.code-window {
  background: var(--color-dark);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.code-window-bar {
  display: flex;
  gap: 6px;
  padding: var(--space-3);
  background: var(--color-dark-alt);
}
.code-window-bar span {
  width: 11px; height: 11px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}
.code-window-bar span:nth-child(1) { background: #ef4444; }
.code-window-bar span:nth-child(2) { background: #f59e0b; }
.code-window-bar span:nth-child(3) { background: #22c55e; }
.code-window pre {
  margin: 0;
  padding: var(--space-4);
  overflow-x: auto;
  color: #e2e8f0;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.85rem;
  line-height: 1.7;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  gap: var(--space-6);
}
@media (min-width: 900px) {
  .contact-grid { grid-template-columns: 0.9fr 1.1fr; }
}
.contact-list { margin-top: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); }
.contact-label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}
.contact-list a { font-weight: 600; font-size: 1.05rem; }
.contact-list a:hover { color: var(--color-primary); }

.contact-form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}
.form-row { margin-bottom: var(--space-4); }
.form-row label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--space-2);
}
.form-row input,
.form-row textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  resize: vertical;
}
.form-row input:focus,
.form-row textarea:focus { border-color: var(--color-primary); }
.form-status { margin: var(--space-3) 0 0; font-size: 0.9rem; min-height: 1.3em; }
.form-status[data-state="success"] { color: #16a34a; }
.form-status[data-state="error"] { color: #dc2626; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.6);
  padding-block: var(--space-5);
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
  text-align: center;
}
@media (min-width: 640px) {
  .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; }
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 600;
  color: #fff;
}
.footer-copy { margin: 0; font-size: 0.85rem; color: rgba(255, 255, 255, 0.5); }