/* sovereign.css — shared design system for the hub and every research sub-site.
   One source of truth so the "site within a site" stays visually unified. */
:root{
  /* ground */
  --void:      #05070d;
  --void-2:    #090d18;
  --void-3:    #0d1424;
  --panel:     rgba(14,20,36,0.62);
  --panel-2:   rgba(14,20,36,0.85);
  --edge:      rgba(150,170,220,0.14);
  --line:      rgba(130,150,200,0.11);

  /* ink */
  --ink:       #e9edf6;
  --ink-dim:   #97a3bd;
  --ink-faint: #5c6685;

  /* phase spectrum — the complex-plane palette. these ARE the phase colors. */
  --ph-0:   #ff5d73;   /* phase 0        (positive real) */
  --ph-90:  #ffd166;   /* phase +pi/2    (positive imag) */
  --ph-180: #5ad2ff;   /* phase pi       (negative real) */
  --ph-270: #a77dff;   /* phase -pi/2    (negative imag) */
  --accent: #5ad2ff;   /* primary interactive accent (cyan) */
  --accent-2:#a77dff;  /* secondary (violet) */

  --font-display:'Spectral', Georgia, serif;
  --font-body:'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:'IBM Plex Mono', ui-monospace, Menlo, monospace;
  --maxw: 1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:radial-gradient(140% 100% at 70% -10%, var(--void-3) 0%, var(--void-2) 45%, var(--void) 100%);
  color:var(--ink);font-family:var(--font-body);-webkit-font-smoothing:antialiased;
  line-height:1.6;overflow-x:hidden;
}
::selection{background:rgba(90,210,255,.22);color:#fff}
a{color:inherit;text-decoration:none}

.grain{position:fixed;inset:0;pointer-events:none;z-index:1;opacity:.03;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* ---- wordmark: the operator glyph + SOVEREIGN ---- */
.brand{display:flex;align-items:center;gap:12px;cursor:pointer}
.brand .op{width:28px;height:28px;flex:none}
.brand .wm{font-family:var(--font-display);font-weight:600;font-size:19px;letter-spacing:.02em}
.brand .wm .hat{position:relative}

/* ---- top bar ---- */
.bar{position:fixed;top:0;left:0;right:0;z-index:30;display:flex;align-items:center;justify-content:space-between;
  padding:20px clamp(20px,5vw,52px);transition:background .4s,backdrop-filter .4s,border-color .4s;
  border-bottom:1px solid transparent}
.bar.docked{background:rgba(5,7,13,.74);backdrop-filter:blur(14px);border-bottom-color:var(--line)}
.nav{display:flex;align-items:center;gap:26px}
.nav a{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--ink-dim);transition:color .25s;position:relative}
.nav a:hover{color:var(--ink)}
.nav a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:1px;background:var(--accent);transition:width .3s}
.nav a:hover::after{width:100%}
.back{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--ink-dim);display:flex;align-items:center;gap:8px;transition:gap .3s,color .3s}
.back:hover{gap:12px;color:var(--ink)}

/* ---- buttons ---- */
.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.05em;
  border:1px solid var(--edge);border-radius:100px;padding:11px 20px;background:rgba(14,20,36,.5);
  color:var(--ink);cursor:pointer;transition:border-color .3s,background .3s,transform .25s}
.btn:hover{border-color:var(--accent);background:rgba(14,20,36,.8);transform:translateY(-2px)}
.btn.solid{background:var(--accent);color:var(--void);border-color:var(--accent);font-weight:500}
.btn.solid:hover{filter:brightness(1.08)}

/* ---- reading progress (study pages) ---- */
.reading-progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:40;transform-origin:left;
  transform:scaleX(0);background:linear-gradient(90deg,var(--accent),var(--accent-2));
  will-change:transform;transition:transform .08s linear;pointer-events:none}

/* prev/next labels truncate gracefully so long titles never break the nav row */
.nextnav .lbl{max-width:34ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nextnav .nav-next{margin-left:auto}
@media(max-width:620px){ .nextnav .lbl{max-width:20ch} }

/* ---- section frame ---- */
.section{position:relative;z-index:10;max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,52px) 12vh}
.eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.28em;text-transform:uppercase;color:var(--ink-faint)}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:24px;
  padding-bottom:22px;margin-bottom:44px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.sec-head h2{font-family:var(--font-display);font-weight:500;font-size:clamp(26px,3.6vw,40px);letter-spacing:-.01em}
.sec-head .meta{font-family:var(--font-mono);font-size:12px;color:var(--ink-faint);letter-spacing:.05em}

/* ---- domain tags (replaces personal discipline colors with phase spectrum) ---- */
.tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;border-radius:100px;padding:4px 11px;
  border:1px solid var(--edge);color:var(--ink-dim);display:inline-flex;align-items:center;gap:7px}
.tag .dot{width:7px;height:7px;border-radius:50%}
.d-biology .dot,.dot.biology{background:#6cae8f}
.d-math .dot,.dot.math{background:#ffd166}
.d-physics .dot,.dot.physics{background:#5ad2ff}
.d-history .dot,.dot.history{background:#a77dff}
.d-ai .dot,.dot.ai{background:#ff5d73}

/* ---- footer ---- */
.colophon{position:relative;z-index:10;border-top:1px solid var(--line);
  padding:34px clamp(20px,5vw,52px);display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;color:var(--ink-faint)}

@media(max-width:620px){ .nav{display:none} }
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}