/* =========================================================
   Stealthlink — Design Tokens & Global Styles
   ========================================================= */

:root {
  /* Background layers */
  --bg-base: #0A0B10;
  --bg-surface: #12141C;
  --bg-card: #181B26;
  --bg-card-hover: #1D2130;

  /* Accent */
  --accent: #5969FF;
  --accent-hover: #7B88FF;
  --accent-tint: rgba(89, 105, 255, 0.12);
  --accent-tint-strong: rgba(89, 105, 255, 0.22);

  /* Text */
  --text-primary: #EDEFF7;
  --text-muted: #9AA1B5;
  --text-faint: #6B7186;

  /* Borders */
  --border-subtle: rgba(237, 239, 247, 0.08);
  --border-strong: rgba(237, 239, 247, 0.14);
  --border-accent: rgba(89, 105, 255, 0.35);

  /* Status */
  --success: #4ADE80;
  --success-tint: rgba(74, 222, 128, 0.12);

  /* Type */
  --font-heading: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 999px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 150ms;
  --dur-med: 320ms;

  --container-w: 1200px;
  --header-h: 76px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; }
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 var(--space-4);
  letter-spacing: -0.02em;
}
p { margin: 0 0 var(--space-4); color: var(--text-muted); }

/* Focus states — accessible on dark bg */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent-hover);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  background: var(--accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--dur-fast) var(--ease);
}
.skip-link:focus { top: var(--space-4); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 0 0 rgba(89,105,255,0);
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 8px 24px -8px var(--accent-tint-strong);
  transform: translateY(-1px);
}
.btn-secondary {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text-primary);
}
.btn-secondary:hover {
  border-color: var(--border-accent);
  background: var(--accent-tint);
}
.btn-sm { padding: 0.55rem 1.1rem; font-size: 0.875rem; }
.btn svg { width: 18px; height: 18px; flex-shrink: 0; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(10, 11, 16, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  height: var(--header-h);
  display: flex;
  align-items: center;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  width: 100%;
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
}
.logo-img {
  height: 26px;
  width: auto;
  display: block;
}
.footer-brand .logo-img {
  height: 30px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--dur-fast) var(--ease);
  position: relative;
}
.nav-links a:hover { color: var(--text-primary); }

.nav-actions { display: flex; align-items: center; gap: var(--space-4); }

.lang-toggle {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.lang-toggle button {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.4rem 0.7rem;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.lang-toggle button[aria-pressed="true"] {
  background: var(--accent-tint);
  color: var(--accent-hover);
}
.lang-toggle button:hover { color: var(--text-primary); }

.burger {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.burger svg { width: 20px; height: 20px; }
.burger .icon-close { display: none; }
.burger[aria-expanded="true"] .icon-open { display: none; }
.burger[aria-expanded="true"] .icon-close { display: block; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-actions .btn-primary.desktop-only { display: none; }
  .burger { display: flex; }

  .mobile-menu {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: var(--bg-base);
    z-index: 890;
    padding: var(--space-8) var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-med) var(--ease), transform var(--dur-med) var(--ease);
    overflow-y: auto;
  }
  .mobile-menu.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .mobile-menu a {
    font-size: 1.25rem;
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--text-primary);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--border-subtle);
  }
  .mobile-menu .btn { width: 100%; }
}
@media (min-width: 861px) {
  .mobile-menu { display: none; }
}

/* ---------- Sections ---------- */
section { padding: var(--space-24) 0; position: relative; }
.section-head {
  max-width: 640px;
  margin: 0 0 var(--space-12);
}
.section-head.centered { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-hover);
  margin-bottom: var(--space-4);
}
.section-head h2 { font-size: clamp(1.75rem, 3.2vw, 2.5rem); }
.section-head p { font-size: 1.05rem; }

/* ---------- Hero ---------- */
.hero {
  padding-top: var(--space-24);
  padding-bottom: var(--space-16);
  overflow: hidden;
  position: relative;
}
.hero-glow {
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 900px;
  max-width: 160vw;
  background: radial-gradient(circle, var(--accent-tint-strong) 0%, rgba(89,105,255,0.04) 45%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-16);
  align-items: center;
}
.hero-copy h1 {
  font-size: clamp(2.2rem, 4.8vw, 3.6rem);
  margin-bottom: var(--space-6);
}
.hero-copy h1 .accent-text { color: var(--accent-hover); }
.hero-sub {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 46ch;
  margin-bottom: var(--space-8);
}
.hero-ctas {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}
.trust-bullets {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.trust-bullets li {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.9rem;
  color: var(--text-muted);
}
.trust-bullets svg { width: 16px; height: 16px; color: var(--success); flex-shrink: 0; }

/* ---------- Hero visual: device rack ---------- */
.device-rack {
  position: relative;
  z-index: 1;
}
.rack-frame {
  width: 100%;
  height: auto;
}
.rack-glow-line {
  stroke: var(--accent);
  stroke-opacity: 0.55;
}
.phone-outline {
  fill: var(--bg-card);
  stroke: var(--border-strong);
  stroke-width: 1.5;
}
.phone-glow {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.5;
  filter: drop-shadow(0 0 6px rgba(89,105,255,0.65));
}
.phone-dot { fill: var(--accent-hover); }
.pulse-dot {
  animation: pulse 2.4s ease-in-out infinite;
  transform-origin: center;
}
.pulse-dot:nth-child(2) { animation-delay: .3s; }
.pulse-dot:nth-child(3) { animation-delay: .6s; }
.pulse-dot:nth-child(4) { animation-delay: .9s; }
.pulse-dot:nth-child(5) { animation-delay: 1.2s; }
.pulse-dot:nth-child(6) { animation-delay: 1.5s; }
@keyframes pulse {
  0%, 100% { opacity: .35; }
  50% { opacity: 1; }
}
.conn-line {
  stroke: var(--accent);
  stroke-opacity: 0.28;
  stroke-dasharray: 4 5;
}
.hub-ring { fill: none; stroke: var(--accent); stroke-opacity: 0.4; }
.hub-dot { fill: var(--accent-hover); }
.phone-screen { fill: var(--bg-surface); }
.phone-ui-line { fill: var(--border-subtle); }

/* ---------- How it works ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  counter-reset: step;
}
.step-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  position: relative;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--accent-tint);
  color: var(--accent-hover);
  font-family: var(--font-heading);
  font-weight: 700;
  margin-bottom: var(--space-6);
}
.step-card h3 { font-size: 1.15rem; margin-bottom: var(--space-2); }
.step-card p { font-size: 0.95rem; margin-bottom: 0; }
.step-arrow {
  display: none;
}

/* ---------- Cards grid (services) ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}
.svc-card, .usecase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: transform var(--dur-med) var(--ease), border-color var(--dur-med) var(--ease), background var(--dur-med) var(--ease);
}
.svc-card:hover, .usecase-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-tint);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  color: var(--accent-hover);
}
.card-icon svg { width: 24px; height: 24px; }
.svc-card h3, .usecase-card h3 { font-size: 1.2rem; margin-bottom: var(--space-2); }
.svc-card p, .usecase-card p { font-size: 0.95rem; margin-bottom: 0; }

/* ---------- Use cases ---------- */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
.usecase-card { padding: var(--space-6); }
.usecase-card .card-icon { width: 40px; height: 40px; margin-bottom: var(--space-4); }
.usecase-card .card-icon svg { width: 20px; height: 20px; }
.usecase-card h3 { font-size: 1.05rem; }
.usecase-card p { font-size: 0.9rem; }

/* ---------- Why section ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}
.why-item {
  border-left: 2px solid var(--accent);
  padding-left: var(--space-6);
}
.why-item h3 { font-size: 1.1rem; margin-bottom: var(--space-2); }
.why-item p { font-size: 0.95rem; margin-bottom: 0; }

/* ---------- About ---------- */
.about-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}
.stat {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}
.stat .num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-hover);
  display: block;
}
.stat .label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---------- Contact ---------- */
.contact-section { position: relative; }
.contact-wrap {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-16);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-12);
}
.contact-info h2 { font-size: clamp(1.6rem, 2.8vw, 2.1rem); }
.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  font-size: 0.95rem;
  color: var(--text-muted);
}
.contact-detail svg { width: 18px; height: 18px; color: var(--accent-hover); flex-shrink: 0; margin-top: 2px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.form-field { margin-bottom: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); }
.form-field label { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); }
.form-field input,
.form-field textarea {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--dur-fast) var(--ease);
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: var(--text-faint); }
.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--accent);
  outline: none;
}
.form-field textarea { resize: vertical; min-height: 120px; }
.required { color: var(--accent-hover); }

.form-success {
  display: none;
  align-items: flex-start;
  gap: var(--space-4);
  background: var(--success-tint);
  border: 1px solid rgba(74, 222, 128, 0.3);
  border-radius: var(--radius-md);
  padding: var(--space-6);
}
.form-success.show { display: flex; }
.form-success svg { width: 24px; height: 24px; color: var(--success); flex-shrink: 0; }
.form-success h3 { margin-bottom: var(--space-1); font-size: 1.05rem; }
.form-success p { margin-bottom: 0; font-size: 0.9rem; }
.contact-form.hide { display: none; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-16) 0 var(--space-8);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}
.footer-brand .logo { margin-bottom: var(--space-4); }
.footer-brand p { font-size: 0.9rem; max-width: 32ch; }
.footer-col h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  margin-bottom: var(--space-4);
}
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col a { color: var(--text-muted); font-size: 0.9rem; transition: color var(--dur-fast) var(--ease); }
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: 0.85rem;
  color: var(--text-faint);
}

/* ---------- Legal pages ---------- */
.legal-main { padding: var(--space-16) 0 var(--space-24); }
.legal-main .container { max-width: 800px; }
.legal-main h1 { font-size: clamp(1.8rem, 3.5vw, 2.4rem); margin-bottom: var(--space-8); }
.legal-main h2 { font-size: 1.3rem; margin-top: var(--space-12); margin-bottom: var(--space-4); }
.legal-main p, .legal-main li { color: var(--text-muted); font-size: 0.98rem; }
.legal-main ul { list-style: disc; padding-left: 1.4rem; margin-bottom: var(--space-4); }
.legal-main li { margin-bottom: var(--space-2); }
.legal-notice {
  background: var(--accent-tint);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  margin-bottom: var(--space-12);
  font-size: 0.9rem;
  color: var(--text-primary);
}
.placeholder { color: var(--accent-hover); font-style: italic; }

/* ---------- Scroll-reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].in-view {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; }
  .device-rack { max-width: 480px; margin: 0 auto; }
  .about-wrap { grid-template-columns: 1fr; }
  .contact-wrap { grid-template-columns: 1fr; padding: var(--space-8); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  section { padding: var(--space-16) 0; }
  .steps { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .usecase-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: var(--space-8); }
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .hero-ctas .btn { width: 100%; }
}
@media (max-width: 420px) {
  .container { padding: 0 var(--space-4); }
  .stat-grid { grid-template-columns: 1fr; }
}