/* ==========================================================================
   Eigentone — shared site styles for the Science section.
   Mirrors landing-page identity: cyan-on-navy, instrument-panel chrome.
   ========================================================================== */

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

:root {
  --bg:            #080b0f;
  --bg-2:          #0c1018;
  --bg-card:       #0f1620;
  --bg-card-h:     #131c28;
  --bg-deep:       #04080e;
  --bg-pit:        #020508;
  --bg-header:     #060a10;
  --border:        #182030;
  --border-b:      #1e2d42;
  --accent:        #38bdf8;
  --accent-hi:     #7dd3fc;
  --accent-lo:     #0ea5e9;
  --accent-dim:    rgba(56, 189, 248, 0.12);
  --accent-glow:   rgba(56, 189, 248, 0.06);
  --green:         #22c55e;
  --amber:         #f59e0b;
  --red:           #ef4444;
  --silver:        #7a96b4;
  --silver-hi:     #b4cce0;
  --text:          #d8e4f0;
  --text-dim:      #5a7090;

  --font-sans: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', Menlo, monospace;

  --grid-color: rgba(56, 189, 248, 0.025);
  --grid-size:  40px;

  --shadow-card:    0 4px 32px rgba(0, 0, 0, 0.4);
  --shadow-panel:   0 8px 48px rgba(0, 0, 0, 0.5);
  --bevel-top:      inset 0 1px 0 rgba(255, 255, 255, 0.04);
  --bevel-strong:   inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --glow-accent:    0 0 20px rgba(56, 189, 248, 0.35);
  --glow-active:    0 0 0 1px var(--accent),
                    0 0 16px rgba(56, 189, 248, 0.55),
                    inset 0 0 10px rgba(56, 189, 248, 0.18);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.mono { font-family: var(--font-mono); font-feature-settings: "tnum" 1; }
.dim  { color: var(--text-dim); }
.accent-text { color: var(--accent); }
em { font-style: italic; color: var(--silver-hi); }

::selection { background: var(--accent); color: #02060a; }

/* ── NAV ──────────────────────────────────────────────────────────────────
   Mirrors the inline nav styles in v2/index.html so every page matches the
   landing page's top-bar treatment exactly. The 60px height lives on
   .nav-inner (not .nav) so the nav's total height is 61px including the
   1px bottom border — same as index.html. Don't move the height up. */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(8, 11, 15, 0.85);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; height: 60px;
  padding: 0 32px; display: flex; align-items: center; justify-content: space-between;
  /* Pin line-height so the body's 1.65 doesn't inflate the rendered text-cell height
     differently from index.html (which inherits 1.6) — that 1px diff is what shifts
     the flex centering and made nav items appear to "jump" between pages. */
  line-height: 1;
}
.nav-logo {
  font-size: 18px; font-weight: 700; letter-spacing: 0.04em;
  color: var(--accent);
  text-decoration: none;
}
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  font-size: 14px; font-weight: 500;
  color: var(--text); text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover  { color: var(--accent); }
.nav-links a.active { color: var(--accent); }
.nav-muted { color: var(--text-dim) !important; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 4px;
  font: 600 14px/1 var(--font-sans);
  letter-spacing: 0.02em; cursor: pointer; border: none;
  text-decoration: none;
  transition: all 0.15s ease;
}
.btn-primary { background: var(--accent); color: #020810; }
.btn-primary:hover { background: var(--accent-hi); box-shadow: var(--glow-accent); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border-b); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm {
  padding: 8px 16px; font-size: 13px; background: transparent;
  color: var(--accent); border: 1px solid var(--accent); border-radius: 3px;
}
.btn-sm:hover { background: var(--accent-dim); }

/* ── PAGE LAYOUT ────────────────────────────────────────────────────────── */
.page { padding-top: 60px; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

.eyebrow {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent);
  display: inline-flex; align-items: center; gap: 12px;
}
.eyebrow .crumb { color: var(--text-dim); }
.eyebrow .crumb-sep { color: var(--border-b); }

h1.page-title {
  font-size: clamp(34px, 4.4vw, 56px); font-weight: 700;
  line-height: 1.08; letter-spacing: -0.02em; margin: 18px 0 24px;
  text-wrap: balance;
}
.lede {
  font-size: clamp(17px, 1.4vw, 19px); line-height: 1.6;
  color: var(--silver-hi); max-width: 64ch; text-wrap: pretty;
}

.section-label {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--accent);
  display: inline-flex; align-items: center; gap: 10px; margin-bottom: 14px;
}
.section-label::before {
  content: ""; width: 18px; height: 1px; background: var(--accent);
}
h2.section-title {
  font-size: clamp(26px, 2.6vw, 36px); font-weight: 600;
  letter-spacing: -0.015em; line-height: 1.2; text-wrap: balance;
  margin-bottom: 14px;
}

p { color: var(--silver-hi); max-width: 64ch; }
p + p { margin-top: 14px; }
p.sub, .lead { color: var(--silver-hi); }

/* ── PANEL / CARD ───────────────────────────────────────────────────────── */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-b);
  border-radius: 8px;
  box-shadow: var(--shadow-card), var(--bevel-top);
  overflow: hidden;
}
.panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 18px; background: var(--bg-header);
  border-bottom: 1px solid var(--border);
}
.panel-title {
  font: 500 11px/1 var(--font-mono); letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--text-dim);
}
.panel-status {
  font: 400 10px/1 var(--font-mono); letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent);
  display: inline-flex; align-items: center; gap: 8px;
}
.panel-status .dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 6px var(--accent);
  animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.45} }

/* ── EQUATION BLOCK ─────────────────────────────────────────────────────── */
.equation {
  font-family: var(--font-mono); font-size: 16px; color: var(--text);
  background: var(--bg-deep);
  border: 1px solid var(--border-b);
  border-radius: 4px;
  padding: 18px 22px;
  letter-spacing: 0.01em;
  overflow-x: auto;
}
.equation .var { color: var(--accent); }
.equation .lbl { color: var(--text-dim); font-style: italic; }

/* Inline math */
.m { font-family: var(--font-mono); color: var(--silver-hi); }

/* ── HERO HEAD (per-topic) ──────────────────────────────────────────────── */
.topic-hero {
  /* 20px top so the eyebrow sits ~80px from viewport top, matching where
     index.html's hero wordmark begins (60px nav + 20px buffer). */
  padding: 20px 0 48px;
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 56px; align-items: start;
}
.topic-glyph {
  width: 64px; height: 64px; border-radius: 6px;
  background: var(--accent-dim); border: 1px solid rgba(56,189,248,0.4);
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 28px; font-weight: 600;
  color: var(--accent); margin-bottom: 18px;
  box-shadow: var(--bevel-top), 0 0 18px rgba(56,189,248,0.15);
}
.topic-meta {
  display: flex; flex-wrap: wrap; gap: 18px 22px; margin-top: 28px;
  font: 400 12px/1.4 var(--font-mono); color: var(--text-dim);
}
.topic-meta .kv { display: inline-flex; flex-direction: column; gap: 4px; }
.topic-meta .k { font-size: 10px; letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-dim); }
.topic-meta .v { font-size: 13px; color: var(--silver-hi); }

@media (max-width: 900px) { .topic-hero { grid-template-columns: 1fr; gap: 32px; } }

/* ── SECTIONS ───────────────────────────────────────────────────────────── */
.section { padding: 56px 0; border-top: 1px solid var(--border); }
.section + .section { padding-top: 56px; }
.section:last-of-type { padding-bottom: 80px; }

.cols-2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: 48px; align-items: start; }
@media (max-width: 900px) { .cols-2 { grid-template-columns: 1fr; gap: 32px; } }

.cols-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
@media (max-width: 900px) { .cols-3 { grid-template-columns: 1fr; } }

/* ── FACT CARDS ─────────────────────────────────────────────────────────── */
.fact {
  padding: 22px 24px; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: 6px;
  box-shadow: var(--bevel-top);
}
.fact .k {
  font: 500 10px/1 var(--font-mono); letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--text-dim); margin-bottom: 12px;
}
.fact .v { font-size: 22px; font-weight: 500; color: var(--text); letter-spacing: -0.01em; }
.fact .v.mono { font-family: var(--font-mono); font-size: 20px; color: var(--accent); letter-spacing: 0; }
.fact .note { margin-top: 10px; font-size: 13px; color: var(--text-dim); line-height: 1.55; }

/* ── FREQUENCY TABLE ────────────────────────────────────────────────────── */
.freq-table {
  display: grid; grid-template-columns: repeat(7, 1fr);
  gap: 1px; background: var(--border);
  border: 1px solid var(--border); border-radius: 6px; overflow: hidden;
}
.freq-table .cell {
  background: var(--bg-card); padding: 14px 12px; min-height: 96px;
  display: flex; flex-direction: column; gap: 4px; justify-content: space-between;
  transition: background 0.14s ease;
}
.freq-table .cell:hover { background: var(--bg-card-h); }
.freq-table .cell.silent { background: var(--bg-deep); opacity: 0.7; }
.freq-table .key {
  font: 500 10px/1 var(--font-mono); letter-spacing: 0.12em;
  color: var(--text-dim); text-transform: uppercase;
}
.freq-table .label { font: 500 13px/1.2 var(--font-sans); color: var(--text); }
.freq-table .hz { font: 400 13px/1 var(--font-mono); color: var(--accent); }
.freq-table .silent .hz { color: var(--amber); opacity: 0.8; }

/* ── INTERACTIVE FIGURE ────────────────────────────────────────────────── */
.figure {
  background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-deep) 100%);
  border: 1px solid var(--border-b);
  border-radius: 8px;
  box-shadow: var(--shadow-panel), var(--bevel-strong);
  overflow: hidden;
}
.figure .stage {
  position: relative; width: 100%; aspect-ratio: 16 / 11;
  background: var(--bg-pit);
  border-bottom: 1px solid var(--border);
}
.figure svg.stage-svg { width: 100%; height: 100%; display: block; }
.figure .controls {
  display: flex; align-items: center; gap: 16px; padding: 14px 18px;
  flex-wrap: wrap;
}
.figure .ctrl-label {
  font: 500 10px/1 var(--font-mono); letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--text-dim);
}
.figure .readout {
  margin-left: auto; display: flex; align-items: baseline; gap: 8px;
  font-family: var(--font-mono); color: var(--accent);
}
.figure .readout .hz { font-size: 22px; font-weight: 300; letter-spacing: -0.01em; text-shadow: 0 0 14px rgba(56,189,248,0.45); }
.figure .readout .unit { font-size: 11px; color: var(--text-dim); letter-spacing: 0.14em; text-transform: uppercase; }

/* Pill selector */
.pills { display: flex; gap: 6px; flex-wrap: wrap; }
.pill {
  font: 500 11px/1 var(--font-mono); letter-spacing: 0.06em;
  padding: 8px 12px; border-radius: 3px;
  background: var(--bg-deep); color: var(--text-dim);
  border: 1px solid var(--border-b); cursor: pointer;
  transition: all 0.12s ease;
}
.pill:hover { color: var(--accent); border-color: var(--accent); }
.pill.active {
  color: var(--accent); border-color: var(--accent);
  background: linear-gradient(180deg, rgba(56,189,248,0.18), rgba(56,189,248,0.05));
  box-shadow: var(--glow-active);
  text-shadow: 0 0 8px rgba(56,189,248,0.6);
}
.pill.silent { color: #6a4a30; border-color: rgba(245, 158, 11, 0.25); }
.pill.silent.active {
  color: var(--amber); border-color: var(--amber);
  background: rgba(245,158,11,0.08);
  box-shadow: 0 0 0 1px var(--amber), 0 0 14px rgba(245,158,11,0.4);
}

/* slider */
.slider {
  -webkit-appearance: none; appearance: none;
  width: 220px; height: 4px; background: var(--border-b);
  border-radius: 2px; outline: none;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; background: var(--accent);
  border-radius: 50%; cursor: pointer;
  box-shadow: 0 0 10px rgba(56,189,248,0.6);
}
.slider::-moz-range-thumb {
  width: 14px; height: 14px; background: var(--accent);
  border-radius: 50%; border: none; cursor: pointer;
  box-shadow: 0 0 10px rgba(56,189,248,0.6);
}

/* Subscript / superscript styling for body math */
sub, sup { font-family: var(--font-mono); font-size: 0.78em; line-height: 0; position: relative; }

/* CTA strip */
.cta-strip {
  margin: 56px 0 0; padding: 32px 36px;
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-deep) 100%);
  border: 1px solid var(--border-b); border-radius: 8px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  box-shadow: var(--bevel-top);
  position: relative; overflow: hidden;
}
.cta-strip::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 80% 50%, rgba(56,189,248,0.08), transparent 70%);
  pointer-events: none;
}
.cta-strip h3 { font-size: 22px; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 4px; }
.cta-strip p { font-size: 14px; color: var(--text-dim); max-width: 50ch; }
.cta-strip .actions { display: flex; gap: 12px; flex-shrink: 0; }

/* ── FOOTER ─────────────────────────────────────────────────────────────── */
.footer { padding: 48px 0 56px; border-top: 1px solid var(--border); margin-top: 80px; background: var(--bg-2); }
.footer-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: baseline; gap: 14px; }
.footer-logo { font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text); }
.footer-tag { font-size: 12px; letter-spacing: 0.05em; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a { font-size: 13px; color: var(--text-dim); }
.footer-links a:hover { color: var(--accent); }
.footer-copy { font-size: 11px; letter-spacing: 0.06em; }

/* ── PAGER (prev/next topic) ────────────────────────────────────────────── */
.pager {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  margin-top: 48px;
}
.pager a {
  display: block; padding: 18px 22px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px;
  transition: all 0.15s ease;
}
.pager a:hover { border-color: var(--accent); background: var(--bg-card-h); }
.pager .dir { font: 500 10px/1 var(--font-mono); letter-spacing: 0.18em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 8px; }
.pager .ttl { font-size: 15px; color: var(--text); }
.pager .next { text-align: right; }

/* ── INLINE NOTE ────────────────────────────────────────────────────────── */
.note-inline {
  padding: 14px 18px; border-left: 2px solid var(--accent);
  background: rgba(56,189,248,0.04); border-radius: 0 4px 4px 0;
  font-size: 14px; color: var(--silver-hi);
}
.note-inline .tag {
  font: 500 10px/1 var(--font-mono); letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--accent); margin-right: 10px;
}

/* ── ACCOUNT PAGE ───────────────────────────────────────────────────────── */
.account-grid {
  display: grid; grid-template-columns: minmax(0, 1fr); gap: 18px;
  max-width: 760px; margin: 0 auto;
}

.acct-card {
  background: var(--bg-card);
  border: 1px solid var(--border-b);
  border-radius: 8px;
  box-shadow: var(--shadow-card), var(--bevel-top);
  overflow: hidden;
}
.acct-card-head {
  padding: 14px 22px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
}
.acct-card-title {
  font: 500 11px/1 var(--font-mono); letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--text-dim);
}
.acct-card-status {
  font: 500 10px/1 var(--font-mono); letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--text-dim);
  display: inline-flex; align-items: center; gap: 8px;
}
.acct-card-status.is-pending { color: var(--amber); }
.acct-card-body { padding: 22px; }

/* License-key row */
.acct-key-row {
  display: flex; align-items: stretch; gap: 8px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 12px;
}
.acct-key-row .key-value {
  flex: 1; font-family: var(--font-mono); font-size: 14px;
  color: var(--silver-hi); letter-spacing: 0.04em;
  overflow-x: auto; white-space: nowrap;
  display: flex; align-items: center;
}
.acct-key-row .key-actions { display: flex; gap: 6px; flex-shrink: 0; }
.acct-mini-btn {
  padding: 6px 12px; font: 500 11px/1 var(--font-mono);
  letter-spacing: 0.08em; text-transform: uppercase;
  background: transparent; color: var(--accent);
  border: 1px solid var(--border-b); border-radius: 3px;
  cursor: pointer; transition: all 0.12s;
}
.acct-mini-btn:hover { border-color: var(--accent); background: var(--accent-dim); }
.acct-mini-btn:disabled {
  color: var(--text-dim); cursor: not-allowed; opacity: 0.6;
}
.acct-mini-btn:disabled:hover { background: transparent; border-color: var(--border-b); }

.acct-hint { font-size: 12px; color: var(--text-dim); margin-top: 10px; line-height: 1.5; }

/* Activations list */
.acct-counter {
  font-family: var(--font-mono); font-size: 14px;
  color: var(--accent); letter-spacing: 0.04em;
}
.acct-machines {
  list-style: none; padding: 0; margin: 16px 0 0;
  border: 1px solid var(--border); border-radius: 4px;
  overflow: hidden;
}
.acct-machines li {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; gap: 12px;
  background: var(--bg-deep); border-bottom: 1px solid var(--border);
}
.acct-machines li:last-child { border-bottom: none; }
.acct-machines .m-name { font-size: 14px; color: var(--text); }
.acct-machines .m-meta { font: 400 12px/1.4 var(--font-mono); color: var(--text-dim); }
.acct-machines .m-empty {
  text-align: center; padding: 24px 16px;
  color: var(--text-dim); font-size: 13px; line-height: 1.5;
}

.acct-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }

/* Sign-in slot */
.acct-signin {
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px; flex-wrap: wrap;
}
.acct-signin .who { font-size: 14px; color: var(--text-dim); }
.acct-signin .who strong { color: var(--text); }