@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg:      #08080e;
  --bg2:     #0e0e1a;
  --card:    #111128;
  --border:  #1e1e3a;
  --gold:    #f0b429;
  --gold2:   #e89c0e;
  --cyan:    #38bdf8;
  --red:     #f43f5e;
  --green:   #34d399;
  --text:    #e8e8f8;
  --text2:   #7878a8;
  --muted:   #3a3a5a;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

/* ── BG GRID ─────────────────────── */
.np-bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  display: grid;
  grid-template-columns: repeat(20, 1fr);
  grid-template-rows: repeat(12, 1fr);
  opacity: 0.07;
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  overflow: hidden;
}

.np-bg-grid span {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold);
  transition: color 0.5s, opacity 0.5s;
}

.np-bg-grid span.is-prime { color: var(--gold); opacity: 1; }
.np-bg-grid span.not-prime { opacity: 0.3; }

/* ── HEADER ──────────────────────── */
.np-header {
  position: relative;
  z-index: 1;
  background: radial-gradient(ellipse at 50% 0%, #1a1040 0%, var(--bg) 70%);
  border-bottom: 1px solid var(--border);
  padding: 60px 24px 40px;
  text-align: center;
}

.np-header-inner { max-width: 900px; margin: 0 auto; }

.np-dept {
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 20px;
  font-weight: 700;
}

.np-title {
  font-family: 'Space Mono', monospace;
  font-size: clamp(2.5rem, 8vw, 5.5rem);
  font-weight: 700;
  line-height: 0.9;
  color: var(--text);
}

.np-title-accent { color: var(--gold); }

.np-tagline {
  margin-top: 18px;
  color: var(--text2);
  font-size: 1rem;
}

.np-hero-nums {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 28px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.np-hero-nums span {
  font-family: 'Space Mono', monospace;
  font-size: 0.85rem;
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--text2);
  transition: all 0.3s;
}

.np-hero-nums span.prime {
  color: var(--gold);
  border-color: var(--gold);
  background: rgba(240,180,41,.08);
  font-weight: 700;
}

/* ── NAV ─────────────────────────── */
.np-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8,8,14,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0;
  padding: 0 16px;
}

.np-nav-a {
  padding: 12px 16px;
  font-size: 0.78rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--text2);
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
  white-space: nowrap;
}

.np-nav-a:hover { color: var(--gold); border-color: var(--gold); }
.np-nav-a.active { color: var(--gold); border-color: var(--gold); }

/* ── MAIN ────────────────────────── */
.np-main {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  display: flex;
  flex-direction: column;
  gap: 56px;
}

/* ── SECTION ─────────────────────── */
.np-section { opacity: 0; transform: translateY(28px); transition: opacity .55s, transform .55s; }
.np-section.visible { opacity: 1; transform: translateY(0); }

.sec-head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 22px;
  border-radius: 10px 10px 0 0;
  border-left: 4px solid transparent;
}

.sec-head.gold  { background: rgba(240,180,41,.08); border-color: var(--gold); }
.sec-head.cyan  { background: rgba(56,189,248,.08); border-color: var(--cyan); }

.sec-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
  flex-shrink: 0;
}

.sec-head h2 {
  font-family: 'Space Mono', monospace;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.sec-body {
  background: var(--card);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 10px 10px;
  padding: 28px;
}

.sec-body p { color: var(--text2); line-height: 1.82; font-size: 0.95rem; margin-bottom: 18px; }
.sec-body p:last-child { margin-bottom: 0; }
.sec-body strong { color: var(--text); font-weight: 600; }

/* ── DEF BOX ─────────────────────── */
.def-box {
  background: rgba(240,180,41,.06);
  border: 1px solid rgba(240,180,41,.2);
  border-radius: 8px;
  padding: 16px 22px;
  margin: 18px 0;
  text-align: center;
}

.def-formula {
  font-family: 'Space Mono', monospace;
  font-size: 1.05rem;
  color: var(--gold);
  letter-spacing: 0.03em;
}

/* ── GRID 3 ──────────────────────── */
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; margin-top: 18px; }

.mini-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  background: rgba(255,255,255,.02);
}

.mini-card h4 { font-size: 0.8rem; font-weight: 700; margin-bottom: 6px; }
.mini-card p  { font-size: 0.82rem; color: var(--text2); margin: 0; }
.mini-card.gold   h4 { color: var(--gold); }
.mini-card.silver h4 { color: var(--cyan); }
.mini-card.dim    h4 { color: var(--text2); }

/* ── TIMELINE ────────────────────── */
.timeline { display: flex; flex-direction: column; gap: 0; }

.tl-item { display: flex; gap: 20px; padding-bottom: 28px; position: relative; }
.tl-item:last-child { padding-bottom: 0; }

.tl-item::before {
  content: '';
  position: absolute;
  left: 80px;
  top: 24px;
  bottom: 0;
  width: 1px;
  background: var(--border);
}
.tl-item:last-child::before { display: none; }

.tl-year {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--gold);
  width: 80px;
  flex-shrink: 0;
  padding-top: 4px;
  text-align: right;
  padding-right: 20px;
}

.tl-content { flex: 1; background: var(--bg2); border: 1px solid var(--border); border-radius: 8px; padding: 14px 18px; }
.tl-content h4 { font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.tl-content p  { font-size: 0.85rem; color: var(--text2); margin: 0; line-height: 1.7; }
.tl-content em { color: var(--cyan); font-style: italic; }

/* ── PROP GRID ───────────────────── */
.prop-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }

.prop-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  transition: border-color .2s;
}
.prop-card:hover { border-color: var(--gold); }

.prop-icon {
  font-family: 'Space Mono', monospace;
  font-size: 1.4rem;
  color: var(--gold);
  margin-bottom: 10px;
  display: block;
}

.prop-card h4 { font-size: 0.88rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.prop-card p  { font-size: 0.82rem; color: var(--text2); line-height: 1.7; margin: 0; }

/* ── THEOREM BLOCKS ──────────────── */
.thm-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--cyan);
  border-radius: 0 8px 8px 0;
  padding: 20px 22px;
  margin-bottom: 14px;
}
.thm-block:last-child { margin-bottom: 0; }

.thm-label { font-size: 0.78rem; font-weight: 700; color: var(--cyan); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px; }
.thm-formula { font-family: 'Space Mono', monospace; font-size: 1rem; color: var(--gold); margin-bottom: 10px; padding: 8px 14px; background: rgba(240,180,41,.06); border-radius: 6px; display: inline-block; }
.thm-block p { font-size: 0.88rem; color: var(--text2); line-height: 1.75; margin: 0; }

/* ── SIEVE ───────────────────────── */
.sieve-demo {
  display: grid;
  grid-template-columns: repeat(20, 1fr);
  gap: 3px;
  margin: 18px 0;
  padding: 16px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.sieve-demo span {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 26px;
  border-radius: 4px;
  border: 1px solid transparent;
  color: var(--muted);
  transition: all 0.3s;
}

.sieve-demo span.sp  { color: var(--gold); border-color: rgba(240,180,41,.3); background: rgba(240,180,41,.07); font-weight: 700; }
.sieve-demo span.sc  { color: var(--muted); text-decoration: line-through; opacity: 0.4; }

/* ── REPARTITION TABLE ───────────── */
.repartition-table { border: 1px solid var(--border); border-radius: 8px; overflow: hidden; margin: 18px 0; }

.rtable-header {
  display: grid; grid-template-columns: 1fr 1fr 1fr 1fr;
  padding: 9px 14px;
  background: rgba(255,255,255,.04);
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text2);
}

.rtable-row {
  display: grid; grid-template-columns: 1fr 1fr 1fr 1fr;
  padding: 9px 14px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem; color: var(--text2);
  font-family: 'Space Mono', monospace;
}
.rtable-row:hover { background: rgba(255,255,255,.02); }

/* ── CONJECTURES ─────────────────── */
.conjecture-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; }

.conj-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}
.conj-card.open { border-top: 3px solid var(--red); }

.conj-status {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--red);
  margin-bottom: 8px;
}

.conj-card h4 { font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.conj-card p  { font-size: 0.83rem; color: var(--text2); line-height: 1.75; margin: 0; }

/* ── CRYPTO BOX ──────────────────── */
.crypto-box {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin: 18px 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.crypto-step { display: flex; gap: 14px; align-items: flex-start; }
.cs-num {
  width: 28px; height: 28px; flex-shrink: 0;
  background: rgba(240,180,41,.15); border: 1px solid rgba(240,180,41,.3);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Space Mono', monospace; font-size: 0.75rem; font-weight: 700; color: var(--gold);
}
.crypto-step div { font-size: 0.86rem; color: var(--text2); line-height: 1.7; }
.crypto-step strong { color: var(--text); }

/* ── RECORDS ─────────────────────── */
.records-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; margin-bottom: 22px; }

.rec-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  text-align: center;
}

.rec-num {
  font-family: 'Space Mono', monospace;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 8px;
  word-break: break-all;
}

.rec-label { font-size: 0.83rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.rec-detail { font-size: 0.76rem; color: var(--text2); }

.curiosities { background: var(--bg2); border: 1px solid var(--border); border-radius: 8px; padding: 20px; }
.curiosities h4 { font-size: 0.9rem; font-weight: 700; color: var(--cyan); margin-bottom: 14px; }
.curiosities ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.curiosities li { font-size: 0.87rem; color: var(--text2); line-height: 1.7; padding-left: 20px; position: relative; }
.curiosities li::before { content: '▸'; position: absolute; left: 0; color: var(--gold); }
.curiosities strong { color: var(--text); }

/* ── FOOTER ──────────────────────── */
.np-footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--border);
  background: var(--bg2);
  padding: 20px 32px;
}

.np-footer-inner {
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; gap: 14px;
  font-size: 0.8rem; color: var(--text2);
}

.np-footer-logo {
  font-family: 'Space Mono', monospace; font-weight: 700; font-size: 1.1rem;
  color: var(--gold); width: 32px; height: 32px;
  background: rgba(240,180,41,.1); border: 1px solid rgba(240,180,41,.3);
  border-radius: 6px; display: flex; align-items: center; justify-content: center;
}

/* ── RESPONSIVE ──────────────────── */
@media (max-width: 768px) {
  .grid-3, .prop-grid, .conjecture-grid, .records-grid { grid-template-columns: 1fr; }
  .rtable-header, .rtable-row { grid-template-columns: 1fr 1fr; font-size: 0.75rem; }
  .tl-item::before { display: none; }
}