/* ===== Navigation ===== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding-block: var(--space-4);
  transition: background var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              backdrop-filter var(--dur-base) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.site-nav.is-scrolled {
  background: rgba(6, 10, 20, 0.72);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom-color: var(--color-border);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-nav__brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  letter-spacing: var(--tracking-snug);
}

.site-nav__brand-mark {
  font-size: var(--fs-md);
  font-weight: var(--fw-medium);
  color: var(--color-text);
}

.site-nav__brand-domain {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-dim);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.site-nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-7);
}

.site-nav__link {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  font-weight: var(--fw-regular);
  position: relative;
  padding-block: var(--space-2);
}

.site-nav__link.is-active,
.site-nav__link:hover {
  color: var(--color-text);
}

.site-nav__link.is-active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-accent);
}

.site-nav__cta {
  font-size: var(--fs-sm);
  padding: 0.65rem 1.2rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
  transition: border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}

.site-nav__cta:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  color: var(--color-text);
}

.site-nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
}

.site-nav__toggle span {
  position: relative;
  width: 22px;
  height: 1px;
  background: var(--color-text);
  display: block;
  transition: transform var(--dur-base) var(--ease-out),
              opacity var(--dur-base) var(--ease-out);
}

.site-nav__toggle span::before,
.site-nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 1px;
  background: var(--color-text);
  transition: transform var(--dur-base) var(--ease-out);
}

.site-nav__toggle span::before { top: -7px; }
.site-nav__toggle span::after  { top:  7px; }

.site-nav.is-open .site-nav__toggle span { background: transparent; }
.site-nav.is-open .site-nav__toggle span::before { transform: translateY(7px) rotate(45deg); }
.site-nav.is-open .site-nav__toggle span::after  { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: var(--space-11);
  padding-bottom: var(--space-9);
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero--compact {
  min-height: 70vh;
  padding-top: clamp(8rem, 18vh, 12rem);
  padding-bottom: var(--space-8);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  pointer-events: none;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(125, 200, 255, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(125, 200, 255, 0.06) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 80%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-9);
  align-items: center;
  width: 100%;
}

.hero__copy {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.hero__title {
  font-size: var(--fs-display);
  font-weight: var(--fw-light);
  letter-spacing: var(--tracking-tight);
  line-height: 0.98;
}

.hero__title .accent {
  display: block;
  font-style: italic;
  font-weight: var(--fw-light);
  background: linear-gradient(120deg, var(--color-accent), var(--color-primary) 50%, #B8A2FF);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__sub {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  max-width: 52ch;
  line-height: var(--lh-loose);
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-top: var(--space-3);
}

.hero__meta {
  display: flex;
  gap: var(--space-7);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.hero__meta-value {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  color: var(--color-text);
  letter-spacing: var(--tracking-snug);
}

.hero__meta-label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-dim);
}

/* ===== Sections ===== */
.section {
  padding-block: var(--section-py);
  position: relative;
}

.section--alt {
  background: linear-gradient(180deg, transparent, rgba(11, 18, 34, 0.6) 30%, transparent);
}

.section__head {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: var(--space-8);
  align-items: end;
  margin-bottom: var(--space-8);
}

.section__head--center {
  grid-template-columns: 1fr;
  text-align: center;
  justify-items: center;
}

.section__title {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-light);
  letter-spacing: var(--tracking-tight);
}

.section__lead {
  color: var(--color-text-muted);
}

/* ===== Pillars (capability strip) ===== */
.pillars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.pillars__item {
  padding: var(--space-7) var(--space-5);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.pillars__item:last-child {
  border-right: 0;
}

/* ===== Bento Grid ===== */
.bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-auto-rows: minmax(200px, auto);
  gap: var(--space-5);
}

.bento__cell { grid-column: span 2; }
.bento__cell--wide { grid-column: span 4; }
.bento__cell--full { grid-column: span 6; }
.bento__cell--tall { grid-column: span 3; grid-row: span 2; }
.bento__cell--half { grid-column: span 3; }

/* ===== Two-col layout (about, contact) ===== */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-9);
  align-items: start;
}

.split--narrow {
  grid-template-columns: 1.1fr 0.9fr;
}

/* ===== Footer ===== */
.site-footer {
  padding-block: var(--space-9) var(--space-6);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-9);
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-7);
  margin-bottom: var(--space-8);
}

.site-footer__brand h4 {
  font-size: var(--fs-lg);
  font-weight: var(--fw-light);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-2);
}

.site-footer__brand .cn-name {
  font-size: var(--fs-sm);
  color: var(--color-text-dim);
  letter-spacing: var(--tracking-snug);
}

.site-footer__col-title {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: var(--space-4);
}

.site-footer__col ul li {
  margin-bottom: var(--space-3);
  font-size: var(--fs-sm);
}

.site-footer__col ul a {
  color: var(--color-text-muted);
}

.site-footer__col ul a:hover {
  color: var(--color-accent);
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-dim);
  text-transform: uppercase;
}