/* ============================================
   Stratum Media — Design Tokens
   Contrast-checked against WCAG AA on #0A0D12:
   --text-secondary (~7:1), --accent (~6.2:1)
   Raw --steel (~4:1) is reserved for borders/
   decorative use, not body text.
   ============================================ */
:root {
  --near-black: #0A0D12;
  --deep-navy: #0F1723;
  --graphite: #1A2230;
  --steel: #6B7280;
  --soft-white: #E5E7EB;
  --accent: #7C93B6;
  --accent-bright: #9DB2D4;

  --text-primary: var(--soft-white);
  --text-secondary: rgba(229, 231, 235, 0.68);
  --text-tertiary: rgba(229, 231, 235, 0.45);

  --border: rgba(229, 231, 235, 0.08);
  --border-strong: rgba(229, 231, 235, 0.16);

  --font-display: "Inter Tight", "General Sans", "Neue Haas Grotesk", Inter, sans-serif;
  --font-body: "Inter", sans-serif;

  --container-w: 1240px;
  --gutter: clamp(20px, 5vw, 64px);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --space-24: 96px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 180ms;
  --dur-base: 300ms;
}

/* ============================================
   Reset
   ============================================ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  background: var(--near-black);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, p { margin: 0; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--soft-white);
  color: var(--near-black);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: 600;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: var(--space-4); }

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

/* ============================================
   Typography
   ============================================ */
.eyebrow {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-bright);
  margin-bottom: var(--space-4);
}

h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.75rem, 4.5vw + 1rem, 5rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  max-width: 16ch;
}

h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 2.6vw + 1rem, 3rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  max-width: 22ch;
}

h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.3;
  margin-bottom: var(--space-2);
}

.text-accent { color: var(--accent-bright); }

.hero-lead, .section-head p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 46ch;
}

.section-head { margin-bottom: var(--space-16); }
.section-head h2 { margin-top: var(--space-2); }

.swipe-hint {
  display: none;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  margin-top: var(--space-4);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 var(--space-6);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9375rem;
  white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--soft-white);
  color: var(--near-black);
}
.btn-primary:hover { background: #fff; }

.btn-outline {
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
}
.btn-outline:hover { border-color: var(--accent-bright); background: rgba(124, 147, 182, 0.08); }

.btn-lg { min-height: 52px; padding: 0 var(--space-8); font-size: 1rem; }
.btn-nav { display: none; }

/* ============================================
   Header / Nav
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}
.site-header.scrolled {
  background: rgba(10, 13, 18, 0.85);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: 84px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin-right: auto;
}
.logo-mark { width: 28px; height: 28px; flex-shrink: 0; }
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.logo-sub {
  font-family: var(--font-body);
  font-size: 0.55rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  color: var(--steel);
}

.main-nav ul { display: flex; gap: var(--space-8); }
.main-nav a {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease-out);
  padding: var(--space-2) 0;
}
.main-nav a:hover { color: var(--text-primary); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--soft-white);
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}
.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); }

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: var(--space-6);
  padding: var(--space-6) var(--gutter) var(--space-8);
  border-top: 1px solid var(--border);
  background: var(--near-black);
}
.mobile-nav ul { display: flex; flex-direction: column; gap: var(--space-4); }
.mobile-nav a { font-size: 1.0625rem; color: var(--text-primary); }
.mobile-nav.open { display: flex; }

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, black 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, black 20%, transparent 75%);
}
.hero-grid--contact {
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 10%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 10%, transparent 70%);
  opacity: 0.6;
}

.hero-glow {
  position: absolute;
  top: -20%;
  left: 50%;
  width: 900px;
  height: 600px;
  background: radial-gradient(closest-side, rgba(124, 147, 182, 0.16), transparent);
  transform: translateX(-50%);
  pointer-events: none;
}

.hero-inner { position: relative; z-index: 2; text-align: center; margin-inline: auto; }
.hero-inner h1 { margin-inline: auto; }
.hero-lead { margin: var(--space-6) auto 0; }

.hero-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-8);
  flex-wrap: wrap;
}

.hero-meta {
  margin-top: var(--space-8);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
}

.hero-signal {
  position: relative;
  z-index: 1;
  margin-top: var(--space-16);
  height: 180px;
  width: 100%;
}
.hero-signal svg { width: 100%; height: 100%; overflow: visible; }
.signal-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linecap: round;
  opacity: 0.55;
  stroke-dasharray: 1600;
  stroke-dashoffset: 1600;
  animation: draw 2.4s var(--ease-out) 0.3s forwards;
}
.signal-dot { fill: var(--accent-bright); filter: drop-shadow(0 0 6px var(--accent-bright)); }

@keyframes draw {
  to { stroke-dashoffset: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .signal-line { stroke-dashoffset: 0; animation: none; }
}

/* ============================================
   Ticker
   ============================================ */
.ticker {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  padding: var(--space-6) 0;
}
.ticker-track { display: flex; width: max-content; animation: scroll-left 32s linear infinite; }
.ticker:hover .ticker-track, .ticker:focus-within .ticker-track { animation-play-state: paused; }
.ticker-group { display: flex; gap: var(--space-4); padding-right: var(--space-4); }
.ticker-group span {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  color: var(--text-tertiary);
  white-space: nowrap;
}
.ticker-group span:nth-child(even) { color: var(--accent); }

@keyframes scroll-left {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
  .ticker-track { animation: none; }
  .ticker { overflow-x: auto; }
}

/* ============================================
   Sections
   ============================================ */
.section { padding: var(--space-24) 0; }
.section-alt { background: var(--deep-navy); }

/* ============================================
   Services
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}

.service-card {
  padding: var(--space-8);
  background: var(--graphite);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.service-card:hover { border-color: var(--border-strong); transform: translateY(-4px); }

.service-index {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-6);
}

.service-card p { color: var(--text-secondary); margin-bottom: var(--space-6); }

.tag-list { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.tag-list li {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: var(--space-1) var(--space-3);
}

/* ============================================
   Approach / Steps
   ============================================ */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-8) var(--space-6);
}

.step { display: flex; gap: var(--space-4); }
.step-index {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--accent);
  line-height: 1;
  flex-shrink: 0;
}
.step p { color: var(--text-secondary); }

/* ============================================
   Why Grid
   ============================================ */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-8) var(--space-6);
}
.why-card { border-left: 2px solid var(--accent); padding-left: var(--space-6); }
.why-card p { color: var(--text-secondary); }

/* ============================================
   Contact
   ============================================ */
.section-contact { position: relative; overflow: hidden; }
.contact-inner { position: relative; z-index: 2; }
.section-contact .section-head { text-align: center; margin-inline: auto; }
.section-contact .section-head p { margin-inline: auto; }

.contact-form {
  max-width: 640px;
  margin-inline: auto;
  background: var(--graphite);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.field { margin-bottom: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); }
.field label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.field label span { color: var(--accent-bright); margin-left: 2px; }

.field input, .field select, .field textarea {
  background: var(--near-black);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  min-height: 48px;
  color: var(--text-primary);
  transition: border-color var(--dur-fast) var(--ease-out);
}
.field textarea { min-height: 120px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--accent-bright);
  outline: none;
}

.form-footer { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; margin-top: var(--space-2); }
.form-note { font-size: 0.8125rem; color: var(--text-tertiary); }

/* ============================================
   Footer
   ============================================ */
.site-footer { border-top: 1px solid var(--border); padding-top: var(--space-16); }
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-8);
  padding-bottom: var(--space-12);
}
.footer-brand p { color: var(--text-tertiary); margin-top: var(--space-4); font-size: 0.9375rem; }
.footer-nav ul { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-nav a, .footer-meta a { color: var(--text-secondary); font-size: 0.9375rem; }
.footer-nav a:hover, .footer-meta a:hover { color: var(--text-primary); }
.footer-meta { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-meta p { color: var(--text-tertiary); font-size: 0.9375rem; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-block: var(--space-6);
}
.footer-bottom p { color: var(--text-tertiary); font-size: 0.8125rem; }

/* ============================================
   Scroll reveal
   ============================================ */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
[data-reveal].is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .main-nav { display: none; }
  .btn-nav { display: none; }
  .nav-toggle { display: flex; }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
}

@media (min-width: 861px) {
  .btn-nav { display: inline-flex; }
}

/* ============================================
   Mobile composition — hero + services
   Deliberate phone-specific layout decisions,
   not just a narrower version of the desktop grid.
   ============================================ */
@media (max-width: 640px) {
  .hero { padding-top: var(--space-16); padding-bottom: var(--space-12); }
  .hero-inner { text-align: left; }
  .hero-inner h1 { max-width: none; }
  .hero .hero-lead { margin: var(--space-4) 0 0; max-width: none; }
  .hero-meta { text-align: left; margin-top: var(--space-6); }
  .hero-signal { margin-top: var(--space-8); height: 90px; }

  /* Services: horizontal snap-scroll instead of a stacked, shrunk grid */
  .swipe-hint { display: block; }
  .card-grid {
    display: flex;
    grid-template-columns: none;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-padding-left: var(--gutter);
    gap: var(--space-4);
    margin-inline: calc(var(--gutter) * -1);
    padding-inline: var(--gutter);
    padding-bottom: var(--space-2);
    scrollbar-width: none;
  }
  .card-grid::-webkit-scrollbar { display: none; }
  .service-card { flex: 0 0 84%; scroll-snap-align: start; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
}