/* ── COMMON ── */
.container {
  max-width: 1240px;
  margin: 0 auto;
}
.bp {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--teal);
  color: var(--black);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.85rem 1.6rem;
  border: none;
  border-radius: 2px;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  letter-spacing: 0.02em;
}
.bp:hover {
  background: var(--teal-dark);
  transform: translateY(-1px);
}
.bg {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--white);
  font-weight: 500;
  font-size: 0.85rem;
  padding: 0.85rem 1.6rem;
  border: 1px solid rgba(245, 244, 240, 0.18);
  border-radius: 2px;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.bg:hover {
  border-color: var(--teal);
  background: var(--teal-glow);
}
.slabel {
  font-family: var(--fm);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-weight: 500;
}
.slabel::before {
  content: "";
  display: block;
  width: 2rem;
  height: 1px;
  background: var(--teal);
}
.stitle {
  font-family: var(--fd);
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  line-height: 1.1;
  font-weight: 400;
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}
.stitle em {
  font-style: italic;
  color: var(--teal);
}
.sbody {
  font-size: 1.05rem;
  color: rgba(245, 244, 240, 0.68);
  max-width: 62ch;
  line-height: 1.75;
  font-weight: 300;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.f1 {
  animation: fadeUp 0.7s ease both;
}
.f2 {
  animation: fadeUp 0.7s ease 0.12s both;
}
.f3 {
  animation: fadeUp 0.7s ease 0.24s both;
}
.f4 {
  animation: fadeUp 0.7s ease 0.36s both;
}

/* ── BREADCRUMB ── */
.breadcrumb-bar {
  padding: 1rem 4vw;
  padding-top: calc(64px + 1rem);
  background: var(--black);
  border-bottom: 1px solid var(--border);
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--fm);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  list-style: none;
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}
.breadcrumb a:hover {
  color: var(--teal);
}
.breadcrumb .sep {
  color: rgba(255, 255, 255, 0.15);
}
.breadcrumb .current {
  color: rgba(245, 244, 240, 0.42);
}

/* ── PROGRESS ── */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--teal);
  z-index: 300;
  width: 0;
  transition: width 0.08s linear;
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.7);
}
/* ── FAQ HERO ── */
#faq-hero {
  padding: 5rem 4vw 4rem;
  background: radial-gradient(
      ellipse 70% 60% at 15% 60%,
      rgba(37, 99, 235, 0.07) 0%,
      transparent 70%
    ),
    linear-gradient(180deg, #0a0a0a 0%, #0d1117 100%);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.faq-hero-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      rgba(37, 99, 235, 0.03) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(
    ellipse 80% 100% at 20% 0%,
    black 30%,
    transparent 100%
  );
  pointer-events: none;
}
#faq-hero .container {
  position: relative;
  z-index: 1;
  max-width: 900px;
}
.faq-hero-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-family: var(--fm);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}
.faq-hero-meta .tag-physai {
  font-family: var(--fm);
  font-size: 0.56rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.18rem 0.55rem;
  border-radius: 2px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--teal);
  border: 1px solid rgba(37, 99, 235, 0.3);
  font-weight: 500;
}
.faq-traj {
  display: block;
  width: 100%;
  max-width: 640px;
  height: 42px;
  margin: 2rem 0 0.5rem;
  overflow: visible;
}
.faq-count {
  font-family: var(--fm);
  font-size: 0.65rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  margin-top: 0.75rem;
}
.faq-count span {
  color: rgba(245, 244, 240, 0.35);
  margin: 0 0.5rem;
}

/* ── SECTION NAV ── */
#sec-nav {
  padding: 2rem 4vw;
  background: var(--ink);
  border-bottom: 1px solid var(--border);
}
.sec-nav-label {
  font-family: var(--fm);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
  font-weight: 500;
}
.sec-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 2px 1.5rem;
}
.sec-nav-link {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.55rem 0;
  color: rgba(245, 244, 240, 0.5);
  text-decoration: none;
  font-size: 0.82rem;
  border-bottom: 1px solid transparent;
  transition: color 0.2s;
}
.sec-nav-link:hover {
  color: var(--white);
}
.sec-nav-key {
  font-family: var(--fm);
  font-weight: 600;
  font-size: 0.62rem;
  color: var(--teal);
  letter-spacing: 0.06em;
  min-width: 16px;
  flex: none;
}

/* ── CONTROLS ── */
.faq-controls {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 4vw;
  background: var(--black);
  border-bottom: 1px solid var(--border);
}
.faq-controls button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 2px;
  font-family: var(--fm);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  cursor: pointer;
  padding: 0.4rem 0.9rem;
  transition: border-color 0.2s, color 0.2s;
}
.faq-controls button:hover {
  border-color: var(--teal);
  color: var(--teal);
}

/* ── FAQ MAIN ── */
#faq-main {
  padding: 0 4vw 4rem;
  background: var(--black);
}

.faq-section {
  padding: 3.5rem 0 0;
  scroll-margin-top: 80px;
}
.faq-section:last-child {
  padding-bottom: 2rem;
}

.faq-section-eyebrow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.faq-section-key {
  font-family: var(--fm);
  font-weight: 600;
  font-size: 0.7rem;
  color: var(--black);
  background: var(--teal);
  width: 26px;
  height: 26px;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
  letter-spacing: 0;
}
.faq-section-line {
  flex: none;
  width: 24px;
  height: 1px;
  background: var(--teal);
  opacity: 0.4;
}
.faq-section-title {
  font-family: var(--fd);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--white);
  letter-spacing: -0.01em;
}

/* ── ACCORDION ITEMS ── */
.qa {
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--slate);
  margin: 8px 0;
  overflow: hidden;
  transition: border-color 0.2s;
}
.qa[open] {
  border-color: rgba(37, 99, 235, 0.3);
  background: rgba(22, 28, 38, 0.95);
}
.qa summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.1rem 1.4rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--white);
  transition: background 0.15s;
}
.qa summary::-webkit-details-marker {
  display: none;
}
.qa summary:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}
.qa summary:hover {
  background: rgba(37, 99, 235, 0.04);
}
.qa-num {
  font-family: var(--fm);
  font-weight: 600;
  font-size: 0.65rem;
  color: var(--teal);
  padding-top: 3px;
  min-width: 22px;
  flex: none;
  letter-spacing: 0.04em;
}
.qa-q {
  flex: 1;
  line-height: 1.4;
}
.qa-chev {
  flex: none;
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}
.qa[open] .qa-chev {
  transform: rotate(-135deg);
}
.qa-body {
  padding: 0 1.4rem 1.4rem 3.5rem;
}
.qa-body p {
  font-size: 0.92rem;
  color: rgba(245, 244, 240, 0.72);
  line-height: 1.75;
  font-weight: 300;
}
.qa-body strong {
  font-weight: 600;
  color: var(--white);
}
.qa-body em {
  font-style: italic;
  color: var(--white);
}

@media (max-width: 640px) {
  .qa summary {
    padding: 1rem;
  }
  .qa-body {
    padding: 0 1rem 1rem 2.8rem;
  }
}

/* ── CITATIONS ── */
#faq-citations {
  padding: 3rem 4vw 2rem;
  background: var(--ink);
  border-top: 1px solid var(--border);
}
.citations-toggle {
  font-family: var(--fm);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  list-style: none;
  padding: 0.5rem 0;
  transition: color 0.2s;
}
.citations-toggle::-webkit-details-marker {
  display: none;
}
.citations-toggle:hover {
  color: var(--teal);
}
.citations-chev {
  width: 10px;
  height: 10px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.2s;
}
details.cite-wrap[open] .citations-chev {
  transform: rotate(-135deg);
}
.citations-list {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.cite-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.cite-n {
  font-family: var(--fm);
  font-size: 0.6rem;
  color: var(--teal);
  min-width: 18px;
  padding-top: 2px;
  flex: none;
}
.cite-text {
  font-size: 0.8rem;
  color: rgba(245, 244, 240, 0.45);
  line-height: 1.65;
}
.cite-text strong {
  color: rgba(245, 244, 240, 0.65);
  font-weight: 500;
}
.cite-note {
  margin-top: 1.25rem;
  font-size: 0.75rem;
  color: rgba(245, 244, 240, 0.3);
  line-height: 1.6;
}

/* ── DISCLAIMER NOTE ── */
.disclaimer-note {
  margin: 0 4vw 4vw;
  padding: 1.25rem 1.5rem;
  background: rgba(37, 99, 235, 0.05);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-left: 3px solid var(--teal);
  border-radius: 3px;
  font-size: 0.82rem;
  color: rgba(245, 244, 240, 0.55);
  line-height: 1.7;
}

/* ── CTA STRIP ── */
#cta-strip {
  padding: 5rem 4vw;
  background: linear-gradient(
    135deg,
    #0d1117 0%,
    rgba(37, 99, 235, 0.1) 50%,
    #0d1117 100%
  );
  text-align: center;
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--border);
}
#cta-strip::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      rgba(37, 99, 235, 0.04) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(37, 99, 235, 0.04) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  pointer-events: none;
}
#cta-strip .container {
  position: relative;
  z-index: 1;
}
.cta-acts {
  display: flex;
  gap: 0.85rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}