/* ============================================================
   MindZone — shared technical design system
   Two palettes (light / dark) · Fraunces · Inter · JetBrains Mono
   Square corners, hairline rules, no shadows, no gradients.
   ============================================================ */

/* ---------- LIGHT (default) ---------- */
:root{
  --bg-paper:#F4F2EE; --bg-panel:#ECEAE5; --bg-sunk:#E7E4DD;
  --ink-primary:#15171E; --ink-secondary:#5A5D68; --ink-tertiary:#8E909A;
  --rule:#C9C6BD; --rule-soft:#DAD7CF;
  --accent:#4A5BC9; --accent-soft:rgba(74,91,201,.10);
  --accent-warm:#C4632A; --brain-wave:#6B7FD9;
  --on-accent:#FFFFFF;
  --strip-bg:rgba(244,242,238,.92);
  --grain-op:.025;

  --font-display:'Fraunces','EB Garamond',serif;
  --font-body:'Inter',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono',ui-monospace,monospace;
  --maxw:880px;
}

/* ---------- DARK ---------- */
html[data-theme="dark"]{
  --bg-paper:#0E1016; --bg-panel:#161922; --bg-sunk:#0A0C11;
  --ink-primary:#ECEAE3; --ink-secondary:#9DA0AC; --ink-tertiary:#6A6E7A;
  --rule:#2A2E3A; --rule-soft:#21242E;
  --accent:#7C8DEC; --accent-soft:rgba(124,141,236,.14);
  --accent-warm:#E0844E; --brain-wave:#8FA0F0;
  --on-accent:#0E1016;
  --strip-bg:rgba(14,16,22,.90);
  --grain-op:.04;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--bg-paper); color:var(--ink-primary);
  font-family:var(--font-body); font-size:16px; line-height:1.65;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden;
  transition:background .35s ease, color .35s ease;
}
body::before{
  content:""; position:fixed; inset:0; z-index:0; pointer-events:none; opacity:var(--grain-op);
  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='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
::selection{background:var(--accent); color:var(--on-accent)}
a{color:inherit}
html[dir="rtl"] body{text-align:right}

/* ─────────────────────── HEADER STRIP ─────────────────────── */
.mz-strip{
  position:fixed; top:0; left:0; right:0; height:48px; z-index:50;
  display:flex; align-items:center; justify-content:space-between;
  padding:0 clamp(14px,4vw,40px);
  background:var(--strip-bg); -webkit-backdrop-filter:saturate(1.4); backdrop-filter:saturate(1.4);
  border-bottom:1px solid var(--rule);
  font-family:var(--font-mono);
  transition:background .35s ease, border-color .35s ease;
}
.mz-strip-left{display:flex; align-items:center; gap:13px; min-width:0}
.mz-mark{font-size:13px; font-weight:700; letter-spacing:.10em; color:var(--ink-primary); text-decoration:none; white-space:nowrap}
.mz-div{width:1px; height:16px; background:var(--rule); flex:0 0 auto}
.mz-ver{font-size:11px; color:var(--ink-secondary); letter-spacing:.04em; white-space:nowrap}
.mz-strip-nav{display:flex; align-items:center; gap:2px; overflow-x:auto; scrollbar-width:none; -ms-overflow-style:none}
.mz-strip-nav::-webkit-scrollbar{display:none}
.mz-strip-nav a{
  font-size:11px; letter-spacing:.06em; color:var(--ink-secondary);
  text-decoration:none; padding:5px 7px; white-space:nowrap; transition:color .15s, background .15s;
}
.mz-strip-nav a:hover{color:var(--ink-primary)}
.mz-strip-nav a.active{color:var(--on-accent); background:var(--accent)}

/* ─────────────────────── CHROME CONTROLS (theme + lang) ─────────────────────── */
.mz-controls{display:flex; align-items:center; gap:10px; flex:0 0 auto}
.mz-toggle{
  display:inline-flex; align-items:center; gap:8px; cursor:pointer; user-select:none;
  font-family:var(--font-mono); font-size:11px; letter-spacing:.06em; color:var(--ink-secondary);
  background:none; border:0; padding:4px 2px;
}
.mz-toggle:hover{color:var(--ink-primary)}
.mz-toggle .tt-track{width:30px; height:16px; border:1px solid var(--ink-tertiary); position:relative; flex:0 0 auto}
.mz-toggle .tt-thumb{position:absolute; top:1px; left:1px; width:12px; height:12px; background:var(--ink-primary); transition:left .2s ease}
html[data-theme="dark"] .mz-toggle .tt-thumb{left:15px; background:var(--accent)}
.mz-lang{
  font-family:var(--font-mono); font-size:11px; letter-spacing:.06em; color:var(--ink-secondary);
  background:transparent; border:1px solid var(--rule); padding:5px 7px; cursor:pointer;
  text-transform:uppercase; transition:border-color .15s, color .15s;
}
.mz-lang:hover{border-color:var(--ink-tertiary); color:var(--ink-primary)}

/* ─────────────────────── LAYOUT ─────────────────────── */
.mz-main{position:relative; z-index:1; max-width:var(--maxw); margin:0 auto; padding:0 clamp(20px,5vw,32px)}
.mz-section{padding:84px 0 0}
.mz-section:first-of-type{padding-top:0}
.mz-sec-head{margin-bottom:34px}
.mz-sec-num{font-family:var(--font-mono); font-size:12px; letter-spacing:.16em; color:var(--ink-secondary); text-transform:uppercase; display:block; margin-bottom:9px}
.mz-sec-title{font-family:var(--font-display); font-size:25px; font-weight:500; letter-spacing:-.01em; color:var(--ink-primary); line-height:1.15}
.mz-sec-head::after{content:""; display:block; height:1px; background:var(--rule); margin-top:18px}

p{max-width:62ch; margin-bottom:18px}
p:last-child{margin-bottom:0}
em{font-style:italic; color:var(--ink-primary)}
.mz-mono{font-family:var(--font-mono)}
.mz-lead{color:var(--ink-secondary)}

/* ─────────────────────── PANELS / FRAMES / DIAGRAM ─────────────────────── */
.mz-frame{border:1px solid var(--ink-tertiary); padding:18px 22px; margin:18px 0; font-family:var(--font-mono); font-size:13px}
.mz-panel{background:var(--bg-panel); border:1px solid var(--rule); padding:22px clamp(16px,3vw,26px)}
.mz-diagram{background:var(--bg-panel); border:1px solid var(--ink-tertiary); padding:22px clamp(14px,3vw,26px); overflow-x:auto; margin-bottom:8px}
.mz-diagram pre{font-family:var(--font-mono); font-size:13px; line-height:1.5; color:var(--ink-primary); white-space:pre; min-width:max-content}
.mz-diagram pre a{color:var(--accent); text-decoration:none; border-bottom:1px dotted var(--brain-wave)}
.mz-diagram pre a:hover{background:var(--accent-soft)}

/* ─────────────────────── CARDS ─────────────────────── */
.mz-cards{display:grid; grid-template-columns:1fr 1fr; gap:0; border-top:1px solid var(--rule); border-left:1px solid var(--rule)}
.mz-card{border-right:1px solid var(--rule); border-bottom:1px solid var(--rule); padding:22px 24px 20px; display:flex; flex-direction:column; transition:background .2s ease}
.mz-card:hover{background:var(--bg-panel)}
.mz-card-num{font-family:var(--font-mono); font-size:11px; color:var(--ink-secondary); letter-spacing:.1em; margin-bottom:10px}
.mz-card-title{font-family:var(--font-display); font-size:16px; font-weight:500; line-height:1.25; margin-bottom:12px; color:var(--ink-primary)}
.mz-card-body{font-size:13.5px; line-height:1.6; color:var(--ink-secondary); flex:1 0 auto; margin-bottom:16px}
.mz-card-cite{border-top:1px solid var(--rule-soft); padding-top:11px; font-family:var(--font-mono); font-size:11.5px; line-height:1.5; color:var(--ink-secondary)}
.mz-card-cite .src{color:var(--ink-primary)}
.ev{display:inline-block; margin-top:5px; font-weight:700; letter-spacing:.08em}
.ev-strong{color:var(--accent)} .ev-moderate{color:var(--ink-primary)}
.ev-exploratory{color:var(--ink-secondary)} .ev-aesthetic{color:var(--accent-warm)}

/* ─────────────────────── REFERENCE TABLE ─────────────────────── */
.mz-ref-wrap{overflow-x:auto}
table.mz-ref{border-collapse:collapse; width:100%; min-width:560px; font-family:var(--font-mono); font-size:12.5px}
table.mz-ref th{text-align:left; padding:0 22px 6px 0; color:var(--ink-secondary); font-weight:500; letter-spacing:.08em; text-transform:uppercase; font-size:11px; border-bottom:2px solid var(--ink-secondary)}
table.mz-ref td{padding:7px 22px 7px 0; vertical-align:top; color:var(--ink-secondary)}
table.mz-ref td:first-child{color:var(--ink-primary)}
table.mz-ref tbody tr:first-child td{padding-top:12px}
table.mz-ref .rng{color:var(--accent)}

/* ─────────────────────── BUTTONS ─────────────────────── */
.mz-btn{
  font-family:var(--font-mono); font-size:13px; letter-spacing:.04em;
  border:1px solid var(--ink-primary); background:transparent; color:var(--ink-primary);
  padding:11px 20px; cursor:pointer; display:inline-flex; align-items:center; gap:9px;
  transition:background .15s, color .15s, border-color .15s; text-decoration:none;
}
.mz-btn:hover{background:var(--ink-primary); color:var(--bg-paper)}
.mz-btn-primary{border-color:var(--accent); background:var(--accent); color:var(--on-accent)}
.mz-btn-primary:hover{background:transparent; color:var(--accent)}
.mz-btn[disabled]{border-color:var(--rule); color:var(--ink-tertiary); cursor:not-allowed; background:transparent}

/* ─────────────────────── FORM CONTROLS ─────────────────────── */
.mz-field{display:block; width:100%; font-family:var(--font-body); font-size:15px; color:var(--ink-primary);
  background:var(--bg-panel); border:1px solid var(--rule); padding:13px 15px; transition:border-color .15s}
.mz-field:focus{outline:none; border-color:var(--accent)}
.mz-field::placeholder{color:var(--ink-tertiary)}
textarea.mz-field{resize:vertical; line-height:1.6; min-height:70px}
select.mz-field{font-family:var(--font-mono); font-size:13px; -webkit-appearance:none; appearance:none; cursor:pointer}
.mz-label{font-family:var(--font-mono); font-size:11px; letter-spacing:.1em; text-transform:uppercase; color:var(--ink-secondary); display:block; margin-bottom:8px}

/* pill option group (intensity / sound / mode toggles) */
.mz-pills{display:inline-flex; border:1px solid var(--rule)}
.mz-pill{font-family:var(--font-mono); font-size:12px; letter-spacing:.03em; padding:8px 14px; background:transparent;
  color:var(--ink-secondary); border:0; border-right:1px solid var(--rule); cursor:pointer; transition:background .15s, color .15s}
.mz-pill:last-child{border-right:0}
.mz-pill.active{background:var(--accent); color:var(--on-accent)}
.mz-pill:not(.active):hover{color:var(--ink-primary); background:var(--bg-panel)}

/* ─────────────────────── FOOTER ─────────────────────── */
.mz-footer{position:relative; z-index:1; max-width:var(--maxw); margin:96px auto 0; padding:24px clamp(20px,5vw,32px) 40px;
  border-top:1px solid var(--rule); font-family:var(--font-mono); font-size:11px; color:var(--ink-secondary);
  text-align:center; line-height:1.9; letter-spacing:.03em}

/* ─────────────────────── RTL ─────────────────────── */
html[dir="rtl"] .mz-sec-num,html[dir="rtl"] .mz-label{letter-spacing:0}
html[dir="rtl"] .op-example,html[dir="rtl"] .mz-btn-primary{}

/* ─────────────────────── RESPONSIVE ─────────────────────── */
@media (max-width:680px){
  .mz-cards{grid-template-columns:1fr}
  .mz-ver{display:none}
  .mz-section{padding-top:64px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}