/* ==========================================================================
   Northloop — design tokens & base styles
   Dark, tech-forward, minimal. Mobile-first. WCAG AA contrast targets.
   ========================================================================== */

:root {
  /* Color tokens */
  --bg: #0b0e14;
  --bg-elevated: #12161f;
  --bg-elevated-2: #171c28;
  --border: #232838;
  --text: #e7eaf0;
  --text-muted: #9aa4b2;
  --accent: #4f8cff;
  --accent-2: #22d3ee;
  --accent-contrast: #06111f;
  --success: #34d399;
  --warning: #f5b942;

  /* Typography */
  --font-heading: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, sans-serif;
  --fs-base: 16px;
  --lh-base: 1.6;

  /* Spacing scale (standard density) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  /* Layout */
  --content-max: 1140px;
  --radius: 12px;
  --radius-sm: 8px;

  /* Motion */
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur: 200ms;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.2;
  margin: 0 0 var(--space-3);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.2rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 var(--space-3); color: var(--text-muted); }

a {
  color: var(--accent-2);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
a:hover, a:focus-visible { color: var(--accent); }

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

.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

section { padding: var(--space-7) 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-contrast);
}
.btn-primary:hover { filter: brightness(1.08); }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--accent-2); color: var(--accent-2); }

/* ---------- Header / nav ---------- */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 14, 20, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
}

.brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.brand:hover { color: var(--text); }
.brand .dot { color: var(--accent-2); }

nav.main-nav {
  display: none;
  gap: var(--space-5);
}

nav.main-nav a {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: var(--space-2) 0;
}
nav.main-nav a:hover,
nav.main-nav a[aria-current="page"] { color: var(--text); }

.nav-cta { display: none; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
}

.mobile-menu {
  display: none;
  border-top: 1px solid var(--border);
  padding: var(--space-3) 0 var(--space-4);
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block;
  padding: var(--space-3) 0;
  color: var(--text);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
}
.mobile-menu a:last-child { border-bottom: none; }

@media (min-width: 860px) {
  nav.main-nav { display: flex; }
  .nav-cta { display: inline-flex; }
  .nav-toggle { display: none; }
  .mobile-menu { display: none !important; }
}

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-8) 0 var(--space-7);
  background:
    radial-gradient(600px 300px at 15% 0%, rgba(79, 140, 255, 0.18), transparent 60%),
    radial-gradient(500px 260px at 100% 20%, rgba(34, 211, 238, 0.12), transparent 60%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-2);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.25);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: var(--space-4);
}

.hero-lede {
  font-size: 1.15rem;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

/* ---------- Stack strip ---------- */
.stack-strip {
  padding: var(--space-5) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stack-strip .label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}
.stack-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.stack-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--bg-elevated);
}

/* ---------- Cards / grid ---------- */
.grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}
@media (min-width: 700px) {
  .grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-5);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.card:hover { border-color: rgba(79, 140, 255, 0.4); transform: translateY(-2px); }

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(79, 140, 255, 0.12);
  color: var(--accent-2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}

.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(52, 211, 153, 0.12);
  color: var(--success);
  border: 1px solid rgba(52, 211, 153, 0.3);
}
.tag.tag-demo {
  background: rgba(245, 185, 66, 0.12);
  color: var(--warning);
  border-color: rgba(245, 185, 66, 0.3);
}
.tag.tag-muted {
  background: rgba(154, 164, 178, 0.1);
  color: var(--text-muted);
  border-color: var(--border);
}

/* ---------- Process steps ---------- */
.steps {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
  counter-reset: step;
}
@media (min-width: 700px) { .steps { grid-template-columns: repeat(4, 1fr); } }
.step {
  position: relative;
  padding-top: var(--space-6);
}
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--accent-2);
  font-family: var(--font-heading);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- Portfolio mock frame (placeholder visuals, no fake screenshots) --- */
.mock-frame {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-elevated-2);
  margin-bottom: var(--space-4);
}
.mock-bar {
  display: flex;
  gap: 6px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.mock-bar span {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--border);
}
.mock-body {
  padding: var(--space-5);
  min-height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mock-body svg { width: 100%; height: 100px; }

/* ---------- Section helpers ---------- */
.section-head {
  max-width: 680px;
  margin-bottom: var(--space-6);
}
.kicker {
  color: var(--accent-2);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  display: block;
}

.split {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
  align-items: start;
}
@media (min-width: 860px) { .split { grid-template-columns: 1fr 1fr; } }

.list-check { list-style: none; padding: 0; margin: 0; }
.list-check li {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-2) 0;
  color: var(--text);
}
.list-check li svg { flex-shrink: 0; color: var(--success); margin-top: 3px; }

/* ---------- Footer ---------- */
footer.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
}
footer.site-footer a { color: var(--text-muted); }
footer.site-footer a:hover { color: var(--accent-2); }

/* ---------- Forms ---------- */
.field { margin-bottom: var(--space-4); }
label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--space-2);
  color: var(--text);
}
input, textarea, select {
  width: 100%;
  min-height: 44px;
  padding: 10px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
}
textarea { min-height: 140px; resize: vertical; }
input::placeholder, textarea::placeholder { color: var(--text-muted); opacity: 0.8; }
.hint { font-size: 0.85rem; margin-top: var(--space-2); color: var(--text-muted); }
.form-note {
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: var(--space-4);
}

/* ---------- Page hero (secondary pages) ---------- */
.page-hero { padding: var(--space-7) 0 var(--space-5); }
.page-hero p { max-width: 640px; }

.cta-band {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-6);
  text-align: center;
}
.cta-band h2 { margin-bottom: var(--space-2); }
.cta-band p { max-width: 520px; margin-inline: auto; }