/* ═══════════════════════════════════════════════════════════════════
   Duoprep — shared "Night Desk" theme
   Loaded AFTER each page's own styles. Brings every page in line with
   the video hero: night-navy chrome, paper-cream reading surfaces,
   and the teal → mint gradient from the Duoprep logo.
   ═══════════════════════════════════════════════════════════════════ */
:root {
  /* Brand (from the logo) */
  --brand-navy: #1F3F7A;
  --brand-teal: #2F9A7C;
  --brand-mint: #8FDCC2;
  --night:      #0B1628;
  --night-2:    #122238;
  --cream:      #FAF6EF;
  --cream-soft: rgba(250, 246, 239, 0.74);

  /* Re-tuned paper tokens so accents match the logo */
  --teal:        #1F7F68;
  --teal-deep:   #16604F;
  --teal-bright: #2F9A7C;

  --brand-gradient: linear-gradient(135deg, #2F9A7C 0%, #1F7F68 55%, #1F3F7A 140%);
  --mint-gradient:  linear-gradient(100deg, #6FD0B0 0%, #A8EBD3 45%, #5FB8D6 100%);
}

::selection { background: rgba(47, 154, 124, 0.22); }

/* ── Navigation: night glass on every page ── */
nav {
  background: rgba(11, 22, 40, 0.78) !important;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid rgba(250, 246, 239, 0.08) !important;
  color: var(--cream);
  position: sticky; top: 0; z-index: 50;
}
nav .nav-inner, nav .nav { padding-left: 24px !important; padding-right: 24px !important; }
nav .brand { color: var(--cream) !important; font-weight: 600; letter-spacing: -0.01em; }
nav .brand img {
  height: 32px; width: 32px; object-fit: contain;
  filter: drop-shadow(0 2px 10px rgba(63, 168, 138, 0.45));
}
nav .brand .prep, nav .brand b { color: var(--brand-mint) !important; font-weight: 600; }
nav .brand:hover .prep { color: #BDF0DE !important; }
nav .nav-links a:not(.btn), nav a.back { color: var(--cream-soft) !important; }
nav .nav-links a:not(.btn):hover, nav a.back:hover { color: var(--cream) !important; }
nav .nav-links a:not(.btn)::after { background: var(--brand-mint) !important; }
nav a.back { text-decoration: none; font-size: 0.92rem; }

/* "Sign in" link to the Duoprep app */
nav .nav-links a.nav-signin {
  color: var(--cream) !important; font-weight: 500;
  padding: 7px 14px; border-radius: 8px;
  border: 1px solid rgba(250, 246, 239, 0.22);
  transition: border-color 0.25s, background 0.25s;
}
nav .nav-links a.nav-signin::after { display: none; }
nav .nav-links a.nav-signin:hover { border-color: var(--brand-mint); background: rgba(143, 220, 194, 0.08); }

/* ── Buttons: brand gradient ── */
.btn:not(.btn-ghost) {
  background: var(--brand-gradient);
  color: #fff;
  box-shadow: 0 10px 26px -10px rgba(47, 154, 124, 0.6), inset 0 1px 0 rgba(255,255,255,0.22);
}
.btn:not(.btn-ghost):hover {
  background: var(--brand-gradient);
  filter: brightness(1.08);
  box-shadow: 0 14px 32px -10px rgba(47, 154, 124, 0.75), inset 0 1px 0 rgba(255,255,255,0.28);
  color: #fff;
}

/* Glass button (for use on dark backgrounds) */
.btn-glass {
  display: inline-block;
  background: rgba(12, 24, 44, 0.38);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  border: 1px solid rgba(250, 246, 239, 0.18);
  color: var(--cream) !important;
  padding: 11px 22px; border-radius: 8px; text-decoration: none;
  font-size: 0.92rem; font-weight: 500;
  box-shadow: 0 8px 32px -6px rgba(3, 8, 20, 0.45);
  transition: transform 0.2s cubic-bezier(.34,1.4,.64,1), background 0.25s, border-color 0.25s;
}
.btn-glass:hover {
  background: rgba(12, 24, 44, 0.55);
  border-color: rgba(143, 220, 194, 0.45);
  transform: translateY(-2px);
}

/* ── Night bands: dark sections echo the hero sky ── */
.night-band,
.manifesto,
.beta,
.article-cta {
  background:
    radial-gradient(1px 1px at 12% 22%, rgba(255,255,255,0.55) 50%, transparent 51%),
    radial-gradient(1px 1px at 68% 14%, rgba(255,255,255,0.45) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 84% 62%, rgba(143,220,194,0.6) 50%, transparent 51%),
    radial-gradient(1px 1px at 32% 78%, rgba(255,255,255,0.4) 50%, transparent 51%),
    radial-gradient(1px 1px at 52% 44%, rgba(255,255,255,0.3) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 22% 56%, rgba(255,255,255,0.35) 50%, transparent 51%),
    linear-gradient(180deg, #0B1628 0%, #122238 100%) !important;
  color: var(--cream);
}
.manifesto .accent,
.beta-list li::before { color: var(--brand-mint) !important; }
.manifesto .accent {
  background: var(--mint-gradient);
  -webkit-background-clip: text; background-clip: text; color: transparent !important;
}
.beta .btn, .article-cta .btn, .signup-submit {
  background: var(--mint-gradient) !important;
  color: var(--night) !important; font-weight: 600;
}
.signup input:focus, .signup select:focus { border-color: var(--brand-mint) !important; }
.signup-alt a, .signup-done h3 { color: var(--brand-mint) !important; }
.signup select option { background: var(--night) !important; }

/* Page header band used on blog & legal pages */
.page-band {
  padding: 84px 0 64px; position: relative; overflow: hidden;
  border-bottom: 1px solid rgba(250,246,239,0.06);
}
.page-band::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
  background: linear-gradient(90deg, transparent, rgba(143,220,194,0.55), transparent);
}
.page-band h1 { color: var(--cream) !important; }
.page-band p, .page-band .updated { color: var(--cream-soft) !important; }
.page-band .eyebrow { color: var(--brand-mint) !important; }
.page-band h1 em { font-style: italic; background: var(--mint-gradient);
  -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ── Accents on paper sections ── */
.eyebrow, .layer-name:not(.ai) { color: var(--teal) !important; }
h1 em { color: var(--teal-bright); }
.trio .card { transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease; }
.trio .card:hover {
  transform: translateY(-3px);
  border-color: rgba(47, 154, 124, 0.35);
  box-shadow: 0 18px 40px -24px rgba(11, 22, 40, 0.35);
}
.loop-step { transition: background 0.3s ease; }
.loop-step:hover { background: #FFFFFF; }

/* ── Footer: full-bleed night bookend ── */
footer {
  background: var(--night);
  box-shadow: 0 0 0 100vmax var(--night);
  clip-path: inset(0 -100vmax);
  border-top: none !important;
  color: var(--cream-soft);
}
footer a { color: var(--cream-soft) !important; }
footer a:hover { color: var(--brand-mint) !important; }
footer .foot-mission { color: var(--cream) !important; }
footer span { color: rgba(250,246,239,0.5) !important; }

/* Focus ring in brand colour */
a:focus-visible, button:focus-visible, summary:focus-visible, .btn:focus-visible {
  outline: 3px solid var(--brand-teal) !important; outline-offset: 3px;
}
nav a:focus-visible, footer a:focus-visible, .night-band a:focus-visible {
  outline-color: var(--brand-mint) !important;
}

/* ── Mobile menu (landing page) on dark nav ── */
.menu-toggle {
  background: rgba(250,246,239,0.06) !important;
  border-color: rgba(250,246,239,0.18) !important;
  color: var(--cream) !important;
}
@media (max-width: 620px) {
  .js .nav-links {
    background: rgba(11, 22, 40, 0.97) !important;
    border-color: rgba(250,246,239,0.12) !important;
  }
  .page-band { padding: 56px 0 44px; }
}

@media (prefers-reduced-motion: reduce) {
  .trio .card:hover, .btn-glass:hover { transform: none; }
}