/* ============================================================
   Structural Integrity AI Labs — site styles
   Plain CSS, no preprocessor. Edit directly.
   ============================================================ */

:root {
  --bg-0: #070d18;
  --bg-1: #0a1322;
  --bg-2: #0f1a2e;
  --surface: #13203a;
  --surface-2: #182947;
  --border: #1f2d4a;
  --border-bright: #2a3d63;

  --text: #e6eef8;
  --text-muted: #93a4be;
  --text-dim: #62748e;

  --cyan: #22d3ee;
  --cyan-bright: #67e8f9;
  --cyan-deep: #0891b2;
  --cyan-glow: rgba(34, 211, 238, 0.18);

  --green: #22c55e;
  --amber: #f59e0b;

  --maxw: 1180px;
  --radius: 6px;
  --radius-lg: 12px;

  --font-display: 'Rajdhani', system-ui, sans-serif;
  --font-body: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg-0);
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(circle at 15% 8%, rgba(34, 211, 238, 0.07), transparent 45%),
    radial-gradient(circle at 85% 12%, rgba(8, 145, 178, 0.08), transparent 50%);
  background-attachment: fixed;
}

img { max-width: 100%; display: block; }
a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--cyan-bright); }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* skip link */
.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--cyan); color: var(--bg-0);
  padding: 8px 16px; z-index: 100; font-weight: 600;
}
.skip:focus { left: 16px; top: 16px; }

/* ----- header / nav ----- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(7, 13, 24, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; min-height: 72px;
}

.brand {
  display: flex; align-items: center; gap: 12px;
  color: var(--text);
}
.brand img { border-radius: 50%; }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-line-1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
}
.brand-line-2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.nav-links { display: flex; gap: 28px; }
.nav-links a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.15s ease;
}
.nav-links a:hover,
.nav-links a.active { color: var(--cyan); }
.nav-links a.active { font-weight: 600; }

.site-header.scrolled {
  background: rgba(7, 13, 24, 0.94);
  border-bottom-color: var(--border-bright);
}

@media (max-width: 820px) {
  .nav-links { display: none; }
  .nav { gap: 12px; }
}

/* ----- buttons ----- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: all 0.15s ease;
  cursor: pointer;
  white-space: nowrap;
}
.btn-lg { font-size: 16px; padding: 16px 28px; }

.btn-primary {
  background: var(--cyan);
  color: var(--bg-0);
  border-color: var(--cyan);
  box-shadow: 0 0 0 0 var(--cyan-glow);
}
.btn-primary:hover {
  background: var(--cyan-bright);
  color: var(--bg-0);
  box-shadow: 0 0 24px var(--cyan-glow);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-bright);
}
.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.04);
}

@media (max-width: 600px) {
  .nav-cta { display: none; }
}

/* ----- typography helpers ----- */
.eyebrow, .section-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 16px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.01em;
  margin: 0 0 16px;
  color: var(--text);
}

h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.01em;
}
h2 {
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  line-height: 1.15;
}
h3 {
  font-size: 1.2rem;
  font-weight: 600;
}

.lede, .section-lede {
  color: var(--text-muted);
  font-size: 1.0625rem;
  line-height: 1.7;
  max-width: 680px;
  margin: 0 0 24px;
}

.motto {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan-deep);
  margin: 24px 0;
}

/* ----- hero ----- */
.hero {
  padding: 80px 0 96px;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(34, 211, 238, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 211, 238, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  pointer-events: none;
}
.hero > .container { position: relative; }

.hero-grid { max-width: 880px; }
.hero-copy h1 { max-width: 14ch; }

.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 8px 0 32px; }

.capability-tiles {
  list-style: none; padding: 0; margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.capability-tiles li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex; flex-direction: column; gap: 6px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.capability-tiles li:hover {
  border-color: var(--cyan-deep);
  transform: translateY(-2px);
}
.tile-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.tile-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  line-height: 1.3;
}
@media (max-width: 600px) {
  .capability-tiles { grid-template-columns: 1fr; }
}

/* ----- hero panel (operations signal) ----- */
.hero-panel {
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg-2) 100%);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow:
    0 0 0 1px rgba(34, 211, 238, 0.05),
    0 30px 60px -20px rgba(0, 0, 0, 0.6);
}
.panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 14px;
}
.panel-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}
.panel-pulse {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 12px var(--green);
  animation: pulse 1.6s ease-in-out infinite;
}
.signal-list { list-style: none; padding: 0; margin: 0; }
.signal-list li {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 14px;
}
.signal-list li:last-child { border-bottom: none; }
.signal-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  letter-spacing: 0.02em;
}
.signal-status {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.signal-status .dot {
  width: 7px; height: 7px; border-radius: 50%;
}
.status-online { color: var(--green); }
.status-online .dot { background: var(--green); box-shadow: 0 0 10px var(--green); animation: pulse 1.8s ease-in-out infinite; }
.status-build { color: var(--amber); }
.status-build .dot { background: var(--amber); }

.panel-note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.5;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.55; transform: scale(0.85); }
}

/* ----- generic sections ----- */
.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border);
}
.section-alt { background: var(--bg-1); }
.section h2 { max-width: 820px; }

/* ----- problem grid ----- */
.gap-grid {
  list-style: none; padding: 0; margin: 40px 0 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  counter-reset: gap;
}
.gap-grid li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
}
.gap-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan-deep);
  display: block;
  margin-bottom: 12px;
}
.gap-grid h3 { margin-bottom: 8px; }
.gap-grid p { color: var(--text-muted); margin: 0; }
@media (max-width: 760px) { .gap-grid { grid-template-columns: 1fr; } }

/* ----- solutions ----- */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 40px;
}
.solution {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.solution:hover {
  border-color: var(--cyan-deep);
  transform: translateY(-2px);
}
.solution h3 { color: var(--cyan); margin-bottom: 10px; }
.solution p { color: var(--text-muted); margin: 0; font-size: 0.95rem; }
@media (max-width: 900px) { .solutions-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .solutions-grid { grid-template-columns: 1fr; } }

/* ----- phases ----- */
.phases {
  list-style: none; padding: 0; margin: 40px 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  counter-reset: phase;
}
.phases li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
}
.phases li::before {
  content: '';
  position: absolute; top: 0; left: 0;
  width: 40px; height: 2px;
  background: var(--cyan);
}
.phase-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  display: block;
  margin-bottom: 12px;
}
.phases h3 { margin-bottom: 8px; }
.phases p { color: var(--text-muted); margin: 0; font-size: 0.95rem; }
@media (max-width: 760px) { .phases { grid-template-columns: 1fr; } }

/* ----- why us ----- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 40px;
}
.why-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  padding: 28px;
}
.why-card h3 { margin-bottom: 10px; }
.why-card p { color: var(--text-muted); margin: 0; font-size: 0.95rem; }
@media (max-width: 900px) { .why-grid { grid-template-columns: 1fr; } }

/* ----- contact ----- */
.contact { text-align: left; max-width: 880px; }
.contact-actions {
  margin-top: 32px;
  display: flex; flex-direction: column; gap: 16px;
  align-items: flex-start;
}
.contact-fineprint {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin: 0;
}

/* ----- footer ----- */
.site-footer {
  padding: 32px 0;
  background: var(--bg-0);
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; flex-wrap: wrap;
}
.footer-brand {
  display: flex; align-items: center; gap: 12px;
}
.footer-brand img { border-radius: 50%; }
.footer-name {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  margin: 0;
  font-size: 14px;
}
.footer-motto {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan-deep);
  margin: 2px 0 0;
}
.footer-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  margin: 0;
}

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