/* Thunder Cloud — pilot landing page
   Amber-on-near-black palette. Loaded after Foundation 6, so these rules win. */

:root {
  --tc-bg:        #0A0A0B;
  --tc-surface:   #141416;
  --tc-border:    #2A2A2E;
  --tc-amber:     #FFBF00;
  --tc-amber-hi:  #FFD24A;
  --tc-amber-lo:  #C8911A;
  --tc-text:      #F2E9D0;
  --tc-text-mute: #A89B7A;
  --tc-radius:    10px;
  --tc-max:       1080px;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--tc-bg);
  color: var(--tc-text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", system-ui, "Segoe UI", Roboto, sans-serif;
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

::selection { background: var(--tc-amber); color: var(--tc-bg); }

a {
  color: var(--tc-amber-hi);
  text-decoration: none;
  transition: color 120ms ease;
}
a:hover { color: var(--tc-amber); text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--tc-amber-hi);
  outline-offset: 3px;
  border-radius: 2px;
}

h1, h2, h3 {
  color: var(--tc-amber);
  letter-spacing: -0.02em;
  line-height: 1.15;
  font-weight: 700;
  margin: 0 0 1rem;
}
h1 { font-size: clamp(2.1rem, 5.5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.1rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1rem; }

/* ---------- top bar ---------- */
.tc-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--tc-border);
  max-width: var(--tc-max);
  margin: 0 auto;
}
.tc-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--tc-amber);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.tc-brand:hover { color: var(--tc-amber-hi); text-decoration: none; }
.tc-brand .tc-bolt {
  width: 22px;
  height: 22px;
  color: var(--tc-amber);
  filter: drop-shadow(0 0 8px rgba(255, 191, 0, 0.45));
}
.tc-topbar .tc-contact {
  font-weight: 600;
}

/* ---------- hero ---------- */
.tc-hero {
  position: relative;
  padding: clamp(3rem, 8vw, 6rem) 1.5rem clamp(2.5rem, 6vw, 4.5rem);
  text-align: center;
  overflow: hidden;
  max-width: var(--tc-max);
  margin: 0 auto;
}
.tc-hero::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 30%;
  transform: translate(-50%, -50%);
  width: min(560px, 90vw);
  height: min(560px, 90vw);
  background: radial-gradient(closest-side, rgba(255, 191, 0, 0.18), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.tc-hero > * { position: relative; z-index: 1; }
.tc-bolt-hero {
  width: 84px;
  height: 84px;
  color: var(--tc-amber);
  filter: drop-shadow(0 0 36px rgba(255, 191, 0, 0.5));
  margin: 0 auto 1.5rem;
}
.tc-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--tc-amber);
  margin: 0 auto 0.75rem;
}
.tc-hero h1 { max-width: 18ch; margin: 0 auto 1.25rem; }
.tc-tagline {
  font-size: 0.85rem;
  color: var(--tc-muted, #888);
  margin: -0.75rem auto 1.5rem;
  letter-spacing: 0.03em;
}
.tc-hero .lede {
  max-width: 56ch;
  margin: 0 auto 2rem;
  color: var(--tc-text);
  font-size: clamp(1.05rem, 2vw, 1.18rem);
}

/* ---------- button ---------- */
.tc-btn {
  display: inline-block;
  background: var(--tc-amber);
  color: var(--tc-bg);
  font-weight: 700;
  padding: 0.95rem 1.7rem;
  border-radius: 6px;
  text-decoration: none;
  letter-spacing: -0.005em;
  font-size: 1rem;
  transition: transform 90ms ease, background 120ms ease, box-shadow 150ms ease;
  box-shadow: 0 0 0 0 rgba(255, 191, 0, 0);
  border: 1px solid var(--tc-amber);
}
.tc-btn:hover {
  background: var(--tc-amber-hi);
  border-color: var(--tc-amber-hi);
  color: var(--tc-bg);
  transform: translateY(-1px);
  box-shadow: 0 10px 28px rgba(255, 191, 0, 0.22);
  text-decoration: none;
}
.tc-btn:focus-visible {
  outline: 2px solid var(--tc-amber-hi);
  outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce) {
  .tc-btn:hover { transform: none; }
}

/* ---------- sections ---------- */
section {
  padding: clamp(3rem, 6vw, 4.5rem) 1.5rem;
  max-width: var(--tc-max);
  margin: 0 auto;
}
section + section { padding-top: 0; }
section h2 { margin-bottom: 1.75rem; }

/* ---------- card grid ---------- */
.tc-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}
@media (min-width: 720px) {
  .tc-cards { grid-template-columns: repeat(3, 1fr); }
}
.tc-card {
  background: var(--tc-surface);
  border: 1px solid var(--tc-border);
  border-radius: var(--tc-radius);
  padding: 1.5rem;
}
.tc-card h3 { margin: 0 0 0.5rem; }
.tc-card p { margin: 0; color: var(--tc-text); }

/* ---------- numbered steps ---------- */
ol.tc-steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
  background: var(--tc-surface);
  border: 1px solid var(--tc-border);
  border-radius: var(--tc-radius);
  overflow: hidden;
}
ol.tc-steps li {
  counter-increment: step;
  position: relative;
  padding: 1.15rem 1.25rem 1.15rem 4.25rem;
  border-bottom: 1px solid var(--tc-border);
  color: var(--tc-text);
}
ol.tc-steps li:last-child { border-bottom: none; }
ol.tc-steps li::before {
  content: counter(step);
  position: absolute;
  left: 1rem;
  top: 1.05rem;
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--tc-amber-lo);
  color: var(--tc-amber);
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
}
ol.tc-steps li strong {
  color: var(--tc-amber);
  display: block;
  margin-bottom: 0.15rem;
  font-weight: 700;
}

/* ---------- FAQ ---------- */
details.tc-faq {
  background: var(--tc-surface);
  border: 1px solid var(--tc-border);
  border-radius: 8px;
  margin-bottom: 0.75rem;
}
details.tc-faq > summary {
  list-style: none;
  cursor: pointer;
  padding: 1rem 3rem 1rem 1.25rem;
  font-weight: 600;
  color: var(--tc-text);
  position: relative;
  border-radius: 8px;
}
details.tc-faq > summary::-webkit-details-marker { display: none; }
details.tc-faq > summary::after {
  content: "+";
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--tc-amber);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
}
details.tc-faq[open] > summary::after { content: "−"; }
details.tc-faq > summary:focus-visible {
  outline: 2px solid var(--tc-amber-hi);
  outline-offset: 2px;
}
details.tc-faq > div {
  padding: 0 1.25rem 1.1rem;
  color: var(--tc-text);
}

/* ---------- footer ---------- */
footer.tc-footer {
  border-top: 1px solid var(--tc-border);
  padding: 2rem 1.5rem 2.5rem;
  text-align: center;
  color: var(--tc-text-mute);
  font-size: 0.95rem;
  margin-top: 2rem;
}
footer.tc-footer p { margin: 0.25rem 0; }
footer.tc-footer a { color: var(--tc-amber-hi); }