/* =====================================================================
   NEXUS · Landing page
   ===================================================================== */

body.nx-landing { background: var(--surface-1); }

/* -------- TOPBAR -------- */
.nx-top {
  position: sticky; top: 0; z-index: 30;
  height: 68px;
  display: flex; align-items: center;
  padding: 0 var(--s-6);
  background: rgba(15, 23, 42, 0.92);
  color: #FFF;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nx-top .brand {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-mono);
  font-weight: var(--fw-black);
  letter-spacing: 0.12em;
}
.nx-top .brand .mark {
  width: 32px; height: 32px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--nx-teal-500), var(--nx-teal-800));
  display: flex; align-items: center; justify-content: center;
  color: #FFF;
  font-size: 16px;
  font-weight: var(--fw-black);
}
.nx-top .brand .name { font-size: 15px; letter-spacing: 0.16em; }
.nx-top .brand .sub  { font-size: 9px; opacity: 0.6; letter-spacing: 0.15em; margin-top: 2px; }
.nx-top .brand-block { line-height: 1.1; }
.nx-top nav { margin-left: auto; display: flex; align-items: center; gap: 28px; }
.nx-top nav a {
  color: rgba(255,255,255,0.7);
  font-size: 13px;
  font-weight: var(--fw-med);
  text-decoration: none;
}
.nx-top nav a:hover { color: #FFF; }
.nx-top .cta {
  margin-left: 20px;
  padding: 8px 16px;
  background: var(--nx-teal-500);
  color: #032530;
  border-radius: 6px;
  font-weight: var(--fw-bold);
  font-size: 13px;
}
.nx-top .cta:hover { background: var(--nx-teal-400); color: #032530; text-decoration: none; }

@media (max-width: 900px) { .nx-top nav { display: none; } }

/* -------- HERO -------- */
.nx-hero {
  position: relative;
  padding: 100px 24px 80px;
  color: #FFF;
  background:
    radial-gradient(60% 50% at 80% 20%, rgba(6, 182, 212, 0.28), transparent 60%),
    radial-gradient(50% 60% at 20% 100%, rgba(59, 130, 246, 0.18), transparent 60%),
    linear-gradient(180deg, #030712 0%, #0F172A 60%, #164E63 100%);
  overflow: hidden;
}
.nx-hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(6, 182, 212, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6, 182, 212, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(60% 60% at center, black, transparent 90%);
  pointer-events: none;
}
.nx-hero-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 60px; align-items: center;
  position: relative; z-index: 1;
}
@media (max-width: 1000px) { .nx-hero-inner { grid-template-columns: 1fr; gap: 40px; } }

.nx-hero .kicker {
  display: inline-block; padding: 6px 14px;
  background: rgba(6, 182, 212, 0.14);
  border: 1px solid rgba(6, 182, 212, 0.35);
  color: var(--nx-teal-300);
  border-radius: var(--r-round);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: var(--fw-black);
  margin-bottom: 20px;
}
.nx-hero h1 {
  font-size: 56px;
  font-weight: var(--fw-black);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0 0 20px;
}
.nx-hero h1 em {
  color: var(--nx-teal-300);
  font-style: normal;
  background: linear-gradient(135deg, var(--nx-teal-300), var(--nx-teal-500));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nx-hero .lead {
  font-size: 18px;
  line-height: 1.6;
  color: rgba(255,255,255,0.75);
  max-width: 560px;
  margin: 0 0 32px;
}
.nx-hero .lead strong { color: #FFF; }
.nx-hero .cta-row { display: flex; gap: 14px; flex-wrap: wrap; }
.nx-hero .cta-primary {
  padding: 14px 26px;
  background: var(--nx-teal-500);
  color: #032530;
  border-radius: 10px;
  font-weight: var(--fw-black);
  font-size: 14px;
  letter-spacing: 0.02em;
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 8px;
}
.nx-hero .cta-primary:hover { background: var(--nx-teal-400); text-decoration: none; }
.nx-hero .cta-secondary {
  padding: 14px 22px;
  background: transparent;
  color: #FFF;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 10px;
  font-weight: var(--fw-semi);
  font-size: 14px;
  text-decoration: none;
}
.nx-hero .cta-secondary:hover { border-color: #FFF; text-decoration: none; }

/* Right: operating principle badge */
.op-principle {
  padding: 32px;
  background: rgba(3, 8, 21, 0.6);
  border: 1px solid rgba(6, 182, 212, 0.28);
  border-radius: 14px;
  backdrop-filter: blur(12px);
  position: relative;
}
.op-principle .lbl {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--nx-teal-300);
  font-weight: var(--fw-black);
  margin-bottom: 16px;
}
.op-principle .chain {
  display: flex; flex-direction: column; gap: 4px;
}
.op-principle .step {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px;
  background: rgba(255,255,255,0.03);
  border-radius: 8px;
  border-left: 3px solid var(--nx-teal-500);
}
.op-principle .step .n {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--nx-teal-500);
  color: #032530;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: var(--fw-black);
  font-size: 12px;
}
.op-principle .step .t {
  font-family: var(--font-mono);
  font-weight: var(--fw-black);
  font-size: 13px;
  letter-spacing: 0.14em;
}
.op-principle .step .d {
  color: rgba(255,255,255,0.55);
  font-size: 11px;
  margin-left: auto;
}
.op-principle .principle {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed rgba(6, 182, 212, 0.3);
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.12em;
  text-align: center;
}
.op-principle .principle strong { color: var(--nx-teal-300); }

/* -------- SECTION -------- */
.nx-section { padding: 80px 24px; }
.nx-section-inner { max-width: 1200px; margin: 0 auto; }
.nx-section .eyebrow {
  display: inline-block;
  padding: 4px 12px;
  background: var(--nx-teal-100);
  color: var(--nx-teal-800);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: var(--fw-black);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-radius: var(--r-round);
  margin-bottom: 14px;
}
.nx-section h2 {
  font-size: 40px;
  font-weight: var(--fw-black);
  letter-spacing: -0.02em;
  color: var(--nx-ink-900);
  margin: 0 0 12px;
  max-width: 780px;
}
.nx-section .subtitle {
  font-size: 17px;
  color: var(--nx-ink-500);
  max-width: 720px;
  line-height: 1.6;
  margin: 0 0 40px;
}

/* -------- 9-tier hierarchy visual -------- */
.hierarchy {
  display: flex; flex-direction: column; gap: 10px;
  max-width: 720px;
  margin: 0 auto;
}
.tier-row {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 18px;
  background: var(--surface-0);
  border: 1px solid var(--stroke-1);
  border-radius: 10px;
  border-left: 4px solid var(--nx-teal-500);
  transition: transform 200ms var(--ease-out);
}
.tier-row:hover { transform: translateX(4px); }
.tier-row .idx {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--nx-teal-100);
  color: var(--nx-teal-800);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: var(--fw-black);
  font-size: 14px;
}
.tier-row .role { font-weight: var(--fw-bold); font-size: 15px; color: var(--nx-ink-900); }
.tier-row .scope { color: var(--nx-ink-500); font-size: 12px; margin-left: auto; font-family: var(--font-mono); }

.tier-row.cs { border-left-color: var(--nx-amber-500); background: linear-gradient(90deg, #FFFBEB, var(--surface-0) 60%); }
.tier-row.cs .idx { background: var(--nx-amber-100); color: var(--nx-amber-700); }
.tier-row.village { background: var(--surface-2); }

/* -------- Modules grid -------- */
.mods {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 1000px) { .mods { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .mods { grid-template-columns: 1fr; } }
.mod-card {
  padding: 22px;
  background: var(--surface-0);
  border: 1px solid var(--stroke-1);
  border-radius: 12px;
  transition: transform 200ms var(--ease-out), box-shadow 200ms var(--ease-out);
  position: relative;
  overflow: hidden;
}
.mod-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px -8px rgba(15, 23, 42, 0.12);
}
.mod-card .phase {
  position: absolute; top: 12px; right: 12px;
  font-family: var(--font-mono);
  font-size: 9px;
  padding: 3px 6px;
  border-radius: 3px;
  letter-spacing: 0.1em;
  font-weight: var(--fw-black);
}
.mod-card .phase.p1 { background: var(--nx-teal-100); color: var(--nx-teal-800); }
.mod-card .phase.p2 { background: var(--nx-info-100); color: var(--nx-info); }
.mod-card .phase.p3 { background: var(--nx-warn-100); color: var(--nx-warn); }
.mod-card .phase.p4 { background: var(--surface-2); color: var(--nx-ink-500); }
.mod-card .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--nx-ink-500);
  font-weight: var(--fw-black);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}
.mod-card h3 {
  font-size: 17px;
  font-weight: var(--fw-black);
  color: var(--nx-ink-900);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.mod-card p {
  font-size: 13px;
  color: var(--nx-ink-600);
  line-height: 1.55;
  margin: 0;
}

/* -------- FOOTER -------- */
.nx-foot {
  padding: 40px 24px;
  background: var(--nx-ink-900);
  color: rgba(255,255,255,0.5);
  font-size: 12px;
  text-align: center;
}
.nx-foot strong { color: #FFF; letter-spacing: 0.12em; }
.nx-foot .fk-line { display: flex; align-items: center; justify-content: center; gap: 8px; margin-bottom: 8px; }