/* ============================================================
   PhyCircuit Home — Prototype CSS (uses brand/tokens.css)
   ============================================================ */

* { box-sizing: border-box; }
body { margin: 0; }

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

.section__header { text-align: center; margin: 0 auto var(--space-7); max-width: var(--container-narrow); }
.section__header h2 { margin: var(--space-3) 0 var(--space-2); }
.section__sub { color: var(--fg-2); }

/* ============================================================ NAV */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklch, var(--bg-0) 88%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-0);
}
.nav__row {
  display: flex; align-items: center; gap: var(--space-6);
  padding-block: var(--space-3);
}
.nav__brand {
  display: inline-flex; align-items: center; gap: var(--space-3);
  font-family: var(--font-display); font-weight: 700; font-size: var(--fs-18);
  color: var(--fg-0); text-decoration: none;
  letter-spacing: var(--tracking-snug);
}
.nav__brand svg { color: var(--accent); }
.nav__links {
  display: flex; gap: var(--space-6); margin-left: var(--space-4);
}
.nav__links a {
  color: var(--fg-1);
  font-weight: 500; font-size: var(--fs-16);
  text-decoration: none;
  padding-block: var(--space-2);
  position: relative;
}
.nav__links a:hover { color: var(--fg-0); }
.nav__links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0;
  height: 2px; background: var(--accent); transform: scaleX(0);
  transform-origin: left; transition: transform var(--dur-base) var(--ease);
}
.nav__links a:hover::after { transform: scaleX(1); }
.nav__cta { margin-left: auto; display: flex; align-items: center; gap: var(--space-3); }
.btn--mic { padding: 0.55rem; border-radius: var(--r-full); }

@media (max-width: 720px) {
  .nav__links { display: none; }
}

/* ============================================================ HERO */
.hero {
  position: relative;
  padding-block: clamp(3rem, 8vw, 6rem) clamp(3rem, 6vw, 5rem);
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(60% 60% at 80% 20%, rgba(255,106,44,.18), transparent 60%),
    radial-gradient(50% 50% at 10% 90%, rgba(34,211,238,.14), transparent 60%);
  z-index: 0;
}
.hero > * { position: relative; z-index: 1; }
.hero__grid {
  display: grid; gap: var(--space-7);
  grid-template-columns: 1.05fr 1fr;
  align-items: center;
}
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; }
}

.hero__copy h1 { margin: var(--space-4) 0 var(--space-5); }
.hero__gradient {
  background: var(--grad-thermal);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.hero__sub {
  color: var(--fg-1); font-size: var(--fs-20); max-width: 52ch;
  margin: 0 0 var(--space-6);
}
.hero__cta { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.hero__stats {
  list-style: none; padding: 0; margin: var(--space-6) 0 0;
  display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-6);
  color: var(--fg-2); font-size: var(--fs-14);
}
.hero__stats li::before { content: "⌁  "; color: var(--accent); }
.hero__stats .mono { color: var(--fg-0); margin-right: 0.25rem; }

/* ---- thermal board visual ---- */
.thermal-board {
  position: relative; aspect-ratio: 4 / 3;
  border-radius: var(--r-4);
  background:
    radial-gradient(circle at 65% 38%, rgba(255,106,44,.95) 0%, rgba(225,29,72,.7) 12%, rgba(109,40,217,.45) 28%, rgba(30,58,138,.4) 50%, rgba(10,14,26,.6) 80%),
    linear-gradient(135deg, #1E3A8A 0%, #6D28D9 35%, #E11D48 70%, #F97316 100%);
  border: 1px solid var(--border-1);
  box-shadow: var(--shadow-3), inset 0 0 80px rgba(0,0,0,.4);
  overflow: hidden;
}
.thermal-board::before {
  /* simulated trace grid */
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px),
    linear-gradient(0deg,  rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 28px 28px;
  mix-blend-mode: overlay;
  animation: pulse 8s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: .55; }
  50%      { opacity: .85; }
}
.thermal-board__pin {
  position: absolute; left: var(--x); top: var(--y);
  transform: translate(-50%, -50%);
}
.thermal-board__pin-dot {
  display: block; width: 14px; height: 14px; border-radius: 50%;
  background: var(--fg-0);
  box-shadow: 0 0 0 4px rgba(255,255,255,.25), 0 0 24px rgba(255,255,255,.6);
  animation: blink 1.4s ease-in-out infinite;
}
@keyframes blink {
  0%, 100% { box-shadow: 0 0 0 4px rgba(255,255,255,.25), 0 0 24px rgba(255,255,255,.6); }
  50%      { box-shadow: 0 0 0 8px rgba(255,255,255,.15), 0 0 36px rgba(255,255,255,1); }
}
.thermal-board__pin-label {
  position: absolute; left: 22px; top: 50%; transform: translateY(-50%);
  background: rgba(10,14,26,.85); backdrop-filter: blur(8px);
  border: 1px solid var(--border-1); border-radius: var(--r-2);
  padding: var(--space-2) var(--space-4);
  display: grid; gap: 2px;
  font-size: var(--fs-12); color: var(--fg-0);
  white-space: nowrap;
}
.thermal-board__pin-label strong { font-family: var(--font-mono); font-size: var(--fs-14); color: var(--fg-0); }
.thermal-board__pin-label span { color: var(--fg-1); }
.thermal-board__pin-fix { color: var(--good) !important; font-size: var(--fs-12) !important; }
.thermal-board__legend {
  position: absolute; left: var(--space-4); right: var(--space-4); bottom: var(--space-4);
  display: flex; align-items: center; gap: var(--space-2);
  background: rgba(10,14,26,.6); backdrop-filter: blur(6px);
  border-radius: var(--r-2); padding: var(--space-2) var(--space-3);
  font-size: var(--fs-12); color: var(--fg-0);
}
.thermal-board__legend-bar {
  flex: 1; height: 6px; border-radius: 999px;
  background: linear-gradient(90deg, #1E3A8A, #6D28D9, #E11D48, #F97316);
}

/* ============================================================ TRUST */
.trust {
  border-block: 1px solid var(--border-0);
  background: var(--bg-1);
  padding-block: var(--space-6);
}
.trust__label {
  color: var(--fg-2); text-transform: uppercase; letter-spacing: var(--tracking-wide);
  font-size: var(--fs-12); margin: 0 0 var(--space-3);
}
.trust__row {
  display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-6);
  color: var(--fg-1); font-size: var(--fs-14);
}
.trust__row .mono::before { content: "⌁ "; color: var(--accent-2); }

/* ============================================================ PILLARS */
.pillars { padding-block: var(--space-9); }
.pillars__grid {
  display: grid; gap: var(--space-5);
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
@media (max-width: 900px) { .pillars__grid { grid-template-columns: 1fr; } }

.pillar { display: flex; flex-direction: column; gap: var(--space-3); }
.pillar__icon {
  font-family: var(--font-display); font-size: 40px; line-height: 1;
  color: var(--accent-2);
}
.pillar h3 { margin: 0; }
.pillar__list {
  list-style: none; padding: 0; margin: 0;
  color: var(--fg-1); font-size: var(--fs-14);
  display: grid; gap: var(--space-2);
}
.pillar__list li::before { content: "▸ "; color: var(--accent-2); margin-right: 4px; }
.pillar--featured { border-color: var(--accent); box-shadow: var(--shadow-glow); }

/* ============================================================ AI DEMO */
.ai-demo {
  padding-block: var(--space-9);
  background:
    linear-gradient(180deg, transparent 0%, var(--bg-1) 100%);
  border-top: 1px solid var(--border-0);
}
.ai-demo__grid {
  display: grid; gap: var(--space-7);
  grid-template-columns: 1fr 1.1fr;
  align-items: center;
}
@media (max-width: 900px) { .ai-demo__grid { grid-template-columns: 1fr; } }
.ai-demo__copy h2 { margin: var(--space-3) 0 var(--space-4); }
.ai-demo__bullets {
  list-style: none; padding: 0; margin: var(--space-5) 0;
  display: grid; gap: var(--space-2);
  color: var(--fg-1);
}
.ai-demo__bullets .mono { color: var(--good); margin-right: var(--space-2); }

.ai-demo__widget {
  border: 1px solid var(--border-1);
  border-radius: var(--r-3);
  background: var(--bg-0);
  overflow: hidden;
}
.ai-demo__drop {
  display: grid; place-items: center; gap: var(--space-2);
  padding: var(--space-7);
  border-bottom: 1px dashed var(--border-1);
  color: var(--fg-1); text-align: center;
  cursor: pointer;
  transition: background var(--dur-base) var(--ease);
}
.ai-demo__drop:hover { background: var(--bg-1); }
.ai-demo__drop svg { color: var(--accent-2); }
.ai-demo__drop strong { color: var(--fg-0); font-size: var(--fs-18); }
.ai-demo__drop span { font-size: var(--fs-12); color: var(--fg-2); }

.ai-demo__output {
  padding: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  color: var(--fg-1);
  display: grid; gap: var(--space-2);
  background: linear-gradient(180deg, var(--bg-1) 0%, var(--bg-0) 100%);
}
.ai-demo__line { display: flex; gap: var(--space-2); align-items: baseline; }
.ai-demo__line em { color: var(--accent); font-style: normal; }
.ai-demo__ok   { color: var(--good); }
.ai-demo__warn { color: var(--warn); }
.ai-demo__line--final { color: var(--fg-0); margin-top: var(--space-3); padding-top: var(--space-3); border-top: 1px solid var(--border-0); }

/* ============================================================ TRM */
.trm {
  padding-block: var(--space-9);
  background:
    radial-gradient(60% 60% at 80% 20%, rgba(34,211,238,.10), transparent 60%),
    var(--bg-0);
  border-top: 1px solid var(--border-0);
}
.trm__grid { display: grid; gap: var(--space-7); grid-template-columns: 1fr 1fr; align-items: center; }
@media (max-width: 900px) { .trm__grid { grid-template-columns: 1fr; } }
.trm__header h2 { margin: var(--space-3) 0 var(--space-3); }
.trm__header p { color: var(--fg-1); margin: 0 0 var(--space-5); }

.trm__stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4);
}
.stat {
  background: var(--bg-1);
  border: 1px solid var(--border-0);
  border-radius: var(--r-3);
  padding: var(--space-5);
}
.stat__value {
  font-size: var(--fs-44); font-weight: 700; color: var(--fg-0);
  letter-spacing: var(--tracking-tight);
  background: var(--grad-trace);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat__label { color: var(--fg-2); font-size: var(--fs-14); margin-top: var(--space-2); }

/* ============================================================ WORK */
.work { padding-block: var(--space-9); border-top: 1px solid var(--border-0); }
.work__grid {
  display: grid; gap: var(--space-5);
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 900px) { .work__grid { grid-template-columns: 1fr; } }

.case__photo {
  aspect-ratio: 16/10;
  border-radius: var(--r-2);
  background-position: center; background-size: cover;
  border: 1px solid var(--border-0);
  margin-bottom: var(--space-4);
}
.case__photo--1 {
  background:
    radial-gradient(circle at 30% 60%, rgba(255,106,44,.35), transparent 50%),
    radial-gradient(circle at 70% 40%, rgba(34,211,238,.35), transparent 50%),
    repeating-linear-gradient(90deg, rgba(255,255,255,.05) 0 1px, transparent 1px 24px),
    var(--bg-2);
}
.case__photo--2 {
  background:
    radial-gradient(circle at 50% 70%, rgba(255,106,44,.55), transparent 55%),
    radial-gradient(circle at 50% 30%, rgba(232,168,107,.4), transparent 55%),
    repeating-linear-gradient(0deg, rgba(255,255,255,.05) 0 1px, transparent 1px 24px),
    var(--bg-2);
}
.case__photo--3 {
  background:
    radial-gradient(circle at 20% 30%, rgba(91,228,155,.4), transparent 55%),
    radial-gradient(circle at 80% 70%, rgba(109,40,217,.5), transparent 55%),
    repeating-linear-gradient(45deg, rgba(255,255,255,.05) 0 1px, transparent 1px 24px),
    var(--bg-2);
}
.case h3 { margin: 0 0 var(--space-3); }
.case__stats {
  list-style: none; padding: 0; margin: 0 0 var(--space-3);
  display: flex; flex-wrap: wrap; gap: var(--space-2);
}
.case__stats li { background: var(--bg-2); border: 1px solid var(--border-0); padding: 4px 10px; border-radius: var(--r-full); color: var(--fg-1); font-size: var(--fs-12); }
.case p { color: var(--fg-1); font-size: var(--fs-14); margin: 0 0 var(--space-3); }

/* ============================================================ FIELD GUIDE */
.guide { padding-block: var(--space-8); }
.guide__panel {
  background: linear-gradient(135deg, rgba(255,106,44,.18) 0%, rgba(34,211,238,.10) 100%), var(--bg-1);
  border: 1px solid var(--border-1);
  border-radius: var(--r-4);
  padding: clamp(1.5rem, 4vw, 3rem);
  display: grid; grid-template-columns: 1.2fr 1fr; gap: var(--space-6); align-items: center;
}
@media (max-width: 760px) { .guide__panel { grid-template-columns: 1fr; } }
.guide__panel h2 { margin: var(--space-3) 0 var(--space-2); }
.guide__panel p { color: var(--fg-1); margin: 0; }

.guide__form { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.guide__form input[type="email"] {
  flex: 1; min-width: 220px;
  background: var(--bg-0);
  border: 1px solid var(--border-1); border-radius: var(--r-2);
  padding: 0.75rem 1rem;
  color: var(--fg-0); font: inherit; font-size: var(--fs-16);
  transition: border-color var(--dur-fast) var(--ease);
}
.guide__form input:focus { outline: 2px solid var(--accent); outline-offset: 2px; border-color: var(--accent); }

/* ============================================================ CTA */
.bigcta {
  padding-block: var(--space-9);
  background: var(--bg-1);
  border-block: 1px solid var(--border-0);
}
.bigcta__row { display: flex; justify-content: space-between; gap: var(--space-6); align-items: center; flex-wrap: wrap; }
.bigcta__row h2 { margin: 0 0 var(--space-2); }
.bigcta__row p { color: var(--fg-1); margin: 0; }
.bigcta__buttons { display: flex; gap: var(--space-3); flex-wrap: wrap; }

/* ============================================================ REVEAL */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

/* ============================================================ FOOTER */
.footer { padding-block: var(--space-7); }
.footer__grid {
  display: grid; gap: var(--space-6);
  grid-template-columns: 1.4fr repeat(4, 1fr);
}
@media (max-width: 900px) { .footer__grid { grid-template-columns: 1fr 1fr; } }
.footer__brand { color: var(--fg-2); }
.footer__brand p { font-family: var(--font-display); margin-top: var(--space-3); max-width: 24ch; }
.footer h4 { font-family: var(--font-body); font-size: var(--fs-12); text-transform: uppercase; letter-spacing: var(--tracking-wide); color: var(--fg-2); margin: 0 0 var(--space-3); }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-2); }
.footer a { color: var(--fg-1); text-decoration: none; }
.footer a:hover { color: var(--fg-0); }
.footer__bottom {
  display: flex; justify-content: space-between; gap: var(--space-3); flex-wrap: wrap;
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border-0);
  color: var(--fg-2); font-size: var(--fs-12);
}
.footer__bottom a { color: var(--fg-1); }