/* ============================================================
   COSZION — App Shell v1.0
   Shared chrome for every /apps/* page: starfield, nav, hero,
   reveal, sections, tool cards, empty states, toast.

   Depends on brand.css tokens. Import AFTER brand.css.
   ============================================================ */

/* ============================================================
   Page chrome — starfield + aurora
   ============================================================ */
.stars{
  position:fixed; inset:0; z-index:-2;
  background: radial-gradient(ellipse at top, #0F1428 0%, var(--midnight) 65%, #05070F 100%);
}
.stars canvas{ display:block; width:100%; height:100%; }
.aurora{
  position:fixed; inset:0; z-index:-1; pointer-events:none;
  background:
    radial-gradient(ellipse 60% 40% at 20% 30%, rgba(200,163,90,.05) 0%, transparent 60%),
    radial-gradient(ellipse 50% 35% at 80% 70%, rgba(42,26,58,.38) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 50% 100%, rgba(217,184,121,.04) 0%, transparent 60%);
  filter: blur(40px);
}
[data-theme="light"] .stars{
  background: radial-gradient(ellipse at top, #FAF6EB 0%, var(--bg) 70%, #EBE3D2 100%);
}
[data-theme="light"] .aurora{
  background:
    radial-gradient(ellipse 60% 40% at 20% 30%, rgba(168,126,44,.08) 0%, transparent 60%),
    radial-gradient(ellipse 50% 35% at 80% 70%, rgba(180,140,90,.10) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 50% 100%, rgba(168,126,44,.06) 0%, transparent 60%);
}

/* ============================================================
   Nav — fixed, blur, gold-on-hover
   ============================================================ */
.cz-nav{
  position:fixed; top:0; left:0; right:0; z-index:100;
  padding:14px 0;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  background: rgba(10,14,31,.72);
  border-bottom: 1px solid rgba(35,43,62,.6);
  transition: padding 200ms var(--ease-out), background-color 200ms ease-out;
}
.cz-nav.shrunk{ padding:10px 0; background: rgba(10,14,31,.88); }
[data-theme="light"] .cz-nav{
  background: rgba(244,239,230,.82);
  border-bottom-color: rgba(160,145,110,.35);
}
[data-theme="light"] .cz-nav.shrunk{ background: rgba(244,239,230,.94); }

.cz-nav-inner{
  display:flex; align-items:center; justify-content:space-between;
  gap:24px; max-width:1480px; margin:0 auto; padding: 0 24px;
}
.cz-brand{
  display:flex; align-items:center; gap:10px;
  font-family: var(--serif); font-size:20px; font-weight:500;
  letter-spacing:-.005em; color: var(--cream);
}
[data-theme="light"] .cz-brand{ color: var(--text); }
.cz-brand .italic-z{ font-style:italic; color: var(--accent); font-weight:600; }
.cz-brand .mark{ width:22px; height:22px; color: var(--accent); }
.cz-brand .mark .star{ fill: var(--accent); transform-box: fill-box; transform-origin:center; animation: twinkle 3s ease-in-out infinite; }
.cz-brand .mark .star.s2{ animation-delay:.4s; }
.cz-brand .mark .star.s3{ animation-delay:.8s; }
.cz-brand .mark .star.s4{ animation-delay:1.2s; }

.cz-nav-links{ display:flex; align-items:center; gap:24px; }
.cz-nav-links a{
  font-size:12px; letter-spacing:.06em; color: var(--text-soft);
  transition: color 160ms ease-out;
}
.cz-nav-links a:hover, .cz-nav-links a.active{ color: var(--accent); }
.cz-nav-links a.active{ font-weight:500; }

.cz-nav-cta{
  padding:9px 18px; font-size:11px; min-height:0; letter-spacing:.14em;
}

.cz-theme-toggle{
  background: transparent; border:1px solid rgba(239,230,214,.18);
  color: var(--text-soft); width:36px; height:36px; border-radius:var(--r-full);
  cursor:pointer; display:inline-flex; align-items:center; justify-content:center;
  transition: border-color 160ms, color 160ms, background 160ms;
  font-size:14px; line-height:1;
}
.cz-theme-toggle:hover{ border-color: var(--accent); color: var(--accent); }
[data-theme="light"] .cz-theme-toggle{ border-color: rgba(30,38,60,.18); }

@media (max-width: 880px){
  .cz-nav-links a:not(.cz-nav-cta):not(.cz-theme-toggle){ display:none; }
}

/* ============================================================
   App layout
   ============================================================ */
.cz-app{
  min-height:100vh; min-height:100dvh;
  padding: 96px 24px 64px;
  max-width: 1480px; margin: 0 auto;
  position:relative;
}
.cz-app-narrow{ max-width: 1180px; }
.cz-app-tight{ max-width: 920px; }

/* ============================================================
   Hero — page header
   ============================================================ */
.cz-hero{
  text-align:center; max-width:760px; margin: 0 auto 48px;
  opacity:0; animation: fade-up 600ms var(--ease-out) 80ms forwards;
}
.cz-hero .eyebrow{
  font-size:11px; letter-spacing:.36em; text-transform:uppercase;
  color: var(--accent); font-weight:500;
  margin-bottom:18px;
  display:inline-flex; align-items:center; gap:12px;
}
.cz-hero .eyebrow::before, .cz-hero .eyebrow::after{
  content:""; width:28px; height:1px;
  background: linear-gradient(to right, transparent, rgba(200,163,90,.4));
}
.cz-hero .eyebrow::after{
  background: linear-gradient(to left, transparent, rgba(200,163,90,.4));
}
.cz-hero h1{
  font-family: var(--serif); font-weight:400;
  font-size: clamp(44px, 7vw, 76px);
  line-height: 1.02; letter-spacing:-.025em;
  color: var(--text); margin: 0 0 18px;
}
.cz-hero h1 .ital{ font-style:italic; color: var(--accent); font-weight:500; }
.cz-hero .lede{
  font-family: var(--serif); font-style:italic;
  font-size: clamp(17px, 1.9vw, 21px);
  color: var(--text-soft); line-height:1.5;
  max-width:600px; margin: 0 auto;
}
.cz-hero .sub{
  font-size:14px; color: var(--muted); letter-spacing:.04em;
  margin-top:14px;
}

/* ============================================================
   Section primitives
   ============================================================ */
.cz-section{ margin: 64px 0; }
.cz-section-eyebrow{
  font-size:11px; letter-spacing:.32em; text-transform:uppercase;
  color: var(--accent); font-weight:500;
  margin-bottom:14px; display:flex; align-items:center; gap:14px;
}
.cz-section-eyebrow::after{
  content:""; flex:1; height:1px;
  background: linear-gradient(to right, rgba(200,163,90,.3), transparent);
  max-width:240px;
}
.cz-section-title{
  font-family: var(--serif); font-weight:400;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.08; letter-spacing:-.018em;
  color: var(--text); margin: 0 0 32px;
}
.cz-section-title .ital{ font-style:italic; color: var(--accent); font-weight:500; }
.cz-section-lede{
  font-family: var(--serif); font-style:italic;
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--text-soft); line-height:1.55;
  max-width:640px; margin: -20px 0 32px;
}

/* ============================================================
   Cards
   ============================================================ */
.cz-card{
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 24px 22px;
  transition:
    transform 220ms var(--ease-out),
    border-color 220ms ease-out,
    box-shadow 260ms ease-out;
  position:relative; overflow:hidden;
  will-change: transform;
}
.cz-card::before{
  content:""; position:absolute; top:0; left:0; right:0; height:1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity:0; transition: opacity 220ms ease-out;
}
@media (hover:hover) and (pointer:fine){
  .cz-card:hover{
    border-color: rgba(200,163,90,.4);
    transform: translate3d(0,-3px,0);
    box-shadow: var(--shadow), 0 0 32px rgba(200,163,90,.08);
  }
  .cz-card:hover::before{ opacity:1; }
}
.cz-card:active{ transform: translate3d(0,-1px,0) scale(.995); }
[data-theme="light"] .cz-card:hover{
  box-shadow: var(--shadow), 0 0 32px rgba(168,126,44,.10);
}

/* ============================================================
   Stat tile
   ============================================================ */
.cz-stats{
  display:grid; grid-template-columns:repeat(4,1fr); gap:14px;
}
@media (max-width:880px){ .cz-stats{ grid-template-columns:repeat(2,1fr); } }
.cz-stat{
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 20px 18px;
}
.cz-stat-num{
  font-family: var(--serif); font-size: 38px; font-weight:400;
  color: var(--accent); font-style:italic; line-height:1;
  letter-spacing:-.01em;
  font-feature-settings: "tnum" 1;
}
.cz-stat-label{
  font-size:10.5px; color: var(--muted);
  letter-spacing:.22em; text-transform:uppercase; margin-top:10px;
  font-weight:500;
}

/* ============================================================
   Tool card (linked card with arrow CTA)
   ============================================================ */
.cz-tool{
  display:flex; flex-direction:column; gap:14px;
  min-height: 220px;
  text-decoration: none;
}
.cz-tool .num{
  font-family: var(--serif); font-style:italic; font-weight:300;
  font-size: 38px; color: var(--accent);
  line-height: 1; letter-spacing:-.02em;
}
.cz-tool .name{
  font-family: var(--serif); font-size: 24px; font-weight:500;
  color: var(--text); line-height: 1.15;
}
.cz-tool .desc{
  font-size: 13.5px; line-height: 1.55;
  color: var(--text-soft); flex: 1;
}
.cz-tool .cta{
  font-size: 11px; letter-spacing:.18em; text-transform:uppercase;
  color: var(--accent); font-weight:600;
  display:flex; align-items:center; gap:8px; margin-top: 6px;
  transition: gap .2s;
}
.cz-tool:hover .cta{ gap: 14px; }
.cz-tool .cta::after{ content:"→"; font-family: var(--sans); }
.cz-tool .tag{
  position:absolute; top:18px; right:18px;
  font-size:9.5px; letter-spacing:.22em; text-transform:uppercase;
  background: rgba(127,232,201,.12); color:#7FE8C9;
  border:1px solid rgba(127,232,201,.3);
  padding: 3px 10px; border-radius: var(--r-full); font-weight:600;
}
.cz-tool .tag.soon{
  background: rgba(200,163,90,.12); color: var(--accent);
  border-color: rgba(200,163,90,.32);
}

/* ============================================================
   Two-pane workspace (controls + result)
   ============================================================ */
.cz-workspace{
  display:grid;
  grid-template-columns: 380px 1fr;
  gap: 28px;
  align-items: flex-start;
}
.cz-workspace.wide-controls{ grid-template-columns: 420px 1fr; }
@media (max-width: 980px){ .cz-workspace, .cz-workspace.wide-controls{ grid-template-columns: 1fr; } }

.cz-controls{
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 24px 22px;
  display:flex; flex-direction:column; gap:14px;
  position: sticky; top: 96px;
}
.cz-controls h3{
  font-family: var(--serif); font-size: 22px; font-weight:500;
  color: var(--text); margin: 0 0 4px;
}
.cz-controls .sub{
  font-size: 11px; color: var(--muted);
  letter-spacing:.22em; text-transform:uppercase; margin-bottom: 8px;
  font-weight:500;
}
.cz-controls .row{ display:flex; gap:10px; }
.cz-controls .row > *{ flex:1; min-width:0; }

.cz-results{
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 32px 28px;
  min-height: 600px;
}

/* ============================================================
   Empty state
   ============================================================ */
.cz-empty{
  text-align:center; padding: 80px 24px;
  border: 1px dashed var(--line); border-radius: var(--r-lg);
  color: var(--muted);
}
.cz-empty .glyph{
  font-family: var(--serif); font-style:italic;
  font-size: 64px; color: var(--accent); line-height:1;
  margin-bottom: 16px; font-weight:300;
}
.cz-empty h3{
  font-family: var(--serif); font-weight:500; font-size: 22px;
  color: var(--text-soft); margin: 0 0 8px;
}
.cz-empty p{
  font-size: 14px; line-height: 1.55;
  max-width: 460px; margin: 0 auto;
}

/* ============================================================
   Toast
   ============================================================ */
.cz-toast{
  position: fixed; bottom: 32px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(10,14,31,.94); color: var(--cream);
  padding: 12px 22px; border-radius: var(--r-full);
  font-size: 13px; letter-spacing: .02em;
  border: 1px solid var(--accent);
  box-shadow: var(--shadow-gold);
  z-index: 1000; opacity: 0; pointer-events:none;
  transition: opacity 240ms var(--ease-out), transform 240ms var(--ease-out);
}
.cz-toast.show{ opacity:1; transform: translateX(-50%) translateY(0); }
[data-theme="light"] .cz-toast{ background: rgba(255,255,255,.96); color: var(--text); }

/* ============================================================
   Reveal on scroll
   ============================================================ */
.reveal{
  opacity:0; transform: translate3d(0, 14px, 0);
  transition: opacity 420ms var(--ease-out), transform 420ms var(--ease-out);
  will-change: opacity, transform;
}
.reveal.in{ opacity:1; transform: translate3d(0,0,0); }
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity:1 !important; transform:none !important; }
  *,*::before,*::after{ animation-duration:.001s !important; transition-duration:.001s !important; }
}

/* ============================================================
   Focus ring (a11y)
   ============================================================ */
*:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ============================================================
   Tabular numbers utility
   ============================================================ */
.tnum{ font-feature-settings: "tnum" 1; font-variant-numeric: tabular-nums; }

/* ============================================================
   Demo data badge
   ============================================================ */
.demo-badge{
  display:inline-flex; align-items:center; gap:6px;
  font-size: 10px; letter-spacing:.22em; text-transform:uppercase;
  color: var(--accent); font-weight:600;
  padding: 4px 10px; border-radius: var(--r-full);
  background: rgba(200,163,90,.10); border: 1px solid rgba(200,163,90,.28);
  margin-left: 10px;
}