/* ================================================================
   SITE GUIDE — a plain, honest card grid of real, described pages
   with real buttons. (Previously an over-promised "3D living
   manual" with a heavier opt-in stylesheet that didn't actually
   read as 3D to anyone using it - dropped in favour of a clean,
   fast, genuinely functional page.)
   ================================================================ */

:root{
  --bg:#0a0e17; --surface:#111827; --surface2:#161f30;
  --text:#e2e8f0; --text-secondary:#94a3b8;
  --accent:#3b82f6; --accent-light:#60a5fa;
  --border:#1e293b; --border-light:#334155;
  --radius:14px; --radius-lg:20px;
  --font-sans:system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --max-width:1160px;
}
body.light-mode{
  --bg:#f8fafc; --surface:#ffffff; --surface2:#f1f5f9;
  --text:#0f172a; --text-secondary:#475569;
  --border:#e2e8f0; --border-light:#cbd5e1;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
body{font-family:var(--font-sans);background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
.container{max-width:var(--max-width);margin:0 auto;padding:0 1.25rem}
a{color:inherit}

/* ---- header (shared pattern with privacy_etc.html / landing_page.html) ---- */
.site-header{position:fixed;top:12px;left:50%;transform:translateX(-50%);width:calc(100% - 24px);max-width:calc(var(--max-width) - 24px);z-index:100;border-radius:var(--radius-lg);background:rgba(10,14,23,0.78);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,0.06);box-shadow:0 8px 32px rgba(0,0,0,0.3)}
body.light-mode .site-header{background:rgba(248,250,252,0.85);border-color:rgba(0,0,0,0.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:0.6rem 1.1rem;gap:1rem}
.logo-link{display:flex;align-items:center;gap:0.5rem;text-decoration:none;color:var(--text)}
.logo-img{width:34px;height:34px;border-radius:8px}
.logo-text{font-size:0.92rem;font-weight:700;color:var(--accent-light)}
.nav-links{display:flex;gap:0.2rem}
.nav-links a{padding:0.45rem 0.75rem;border-radius:8px;text-decoration:none;font-size:0.82rem;font-weight:500;color:var(--text-secondary)}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,0.06)}
body.light-mode .nav-links a:hover{color:var(--text);background:rgba(0,0,0,0.05)}
.theme-toggle{background:none;border:none;font-size:1.05rem;cursor:pointer;color:var(--text-secondary);padding:0.45rem;border-radius:50%}
.theme-toggle:hover{color:var(--accent-light)}
@media(max-width:639px){.nav-links{display:none}}

/* ---- buttons ---- */
.btn{display:inline-flex;align-items:center;gap:0.5rem;padding:0.6rem 1.2rem;border-radius:var(--radius);font-weight:600;font-size:0.85rem;text-decoration:none;cursor:pointer;border:2px solid transparent;font-family:var(--font-sans);transition:all .2s ease}
.btn-outline{border-color:var(--border-light);color:var(--text);background:transparent}
.btn-outline:hover{border-color:var(--accent);color:var(--accent-light)}
.btn-sm{padding:0.45rem 0.85rem;font-size:0.78rem}

/* ---- hero ---- */
.nav-hero{padding:8rem 0 2.5rem;text-align:center}
.nav-eyebrow{display:inline-flex;align-items:center;gap:.4rem;font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-light);background:rgba(59,130,246,0.1);padding:.35rem .8rem;border-radius:999px;margin-bottom:1rem}
.nav-hero h1{font-size:clamp(1.7rem,4vw,2.4rem);margin-bottom:.7rem}
.nav-hero p{color:var(--text-secondary);max-width:620px;margin:0 auto 1.6rem;font-size:.95rem}

/* ---- search ---- */
.nav-search-row{display:flex;justify-content:center;margin-top:.5rem}
.nav-search{position:relative;width:100%;max-width:480px}
.nav-search i{position:absolute;left:1rem;top:50%;transform:translateY(-50%);color:var(--text-secondary)}
.nav-search input{width:100%;padding:.8rem 1rem .8rem 2.6rem;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:.88rem;font-family:var(--font-sans)}
.nav-search input:focus{outline:none;border-color:var(--accent)}

/* ================================================================
   CARD GRID — one card per real, navigable feature, each with a
   plain-language description and one or more actual link buttons.
   A simple, honest hover lift - no perspective/rotate claims.
   ================================================================ */
.nav-grid-wrap{padding:1rem 0 5rem}
.nav-card-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:1.4rem;margin-bottom:1rem;
}
.nav-card{
  background:linear-gradient(160deg,var(--surface),var(--surface2));
  border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:1.6rem 1.4rem;display:flex;flex-direction:column;
  box-shadow:0 6px 18px rgba(0,0,0,0.14);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.nav-card:hover,.nav-card:focus-within{
  transform:translateY(-4px);
  border-color:var(--accent);
  box-shadow:0 14px 28px rgba(59,130,246,0.16);
}
.nav-card-icon{
  width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(59,130,246,0.12);color:var(--accent-light);font-size:1.2rem;margin-bottom:1rem;
}
.nav-card h2{font-size:1.02rem;margin-bottom:.4rem}
.nav-card p{font-size:.82rem;color:var(--text-secondary);line-height:1.5;margin-bottom:1.1rem;flex-grow:1}
.nav-card-actions{display:flex;flex-wrap:wrap;gap:.5rem}
.nav-card.is-search-hidden{display:none}

.nav-empty,.nav-no-match{color:var(--text-secondary);text-align:center;padding:2rem 0}

@media(prefers-reduced-motion:reduce){
  .nav-card{transition:none}
  .nav-card:hover,.nav-card:focus-within{transform:none}
}

/* ---- footer ---- */
.site-footer{padding:2rem 0;text-align:center;border-top:1px solid var(--border);color:var(--text-secondary);font-size:.8rem}
.site-footer a{text-decoration:none;color:var(--accent-light)}