/* ChessMend — shared styles for content pages (about, faq, terms, privacy, refund, changelog) */
:root{
  --ink:#12181a;
  --panel:#1b2426;
  --panel-2:#212b2d;
  --line:#313d3f;
  --paper:#ece7dc;
  --paper-dim:#a8ada4;
  --copper:#c68b59;
  --copper-bright:#dba474;
  --eval-good:#6fa287;
  --eval-bad:#c1503a;
  --radius:2px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:'IBM Plex Sans', sans-serif;
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:'Fraunces', serif;
  font-weight:600;
  margin:0;
  letter-spacing:-0.01em;
}
.mono{font-family:'IBM Plex Mono', monospace;}
a{color:var(--copper-bright);}
a:hover{color:var(--paper);}
img{max-width:100%;display:block;}

.container{ max-width:820px; margin:0 auto; padding:0 32px; }
.container.wide{ max-width:1080px; }

/* nav */
nav{
  position:sticky; top:0; z-index:30;
  background:rgba(18,24,26,0.88);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:1080px; margin:0 auto;
  padding:18px 32px;
  display:flex; align-items:center; justify-content:space-between;
}
.brand{ font-family:'Fraunces', serif; font-size:20px; font-weight:600; letter-spacing:0.01em; text-decoration:none; color:var(--paper); }
.brand .dot{color:var(--copper);}
.nav-links{ display:flex; gap:28px; font-size:14px; }
.nav-links a{ color:var(--paper-dim); text-decoration:none; transition:color 0.15s; }
.nav-links a:hover{ color:var(--paper); }
@media (max-width:640px){ .nav-links{ gap:18px; font-size:13px; } }

/* page header */
.page-head{
  padding:80px 0 40px;
  border-bottom:1px solid var(--line);
}
.eyebrow{
  font-family:'IBM Plex Mono', monospace;
  font-size:12px; letter-spacing:0.08em; text-transform:uppercase;
  color:var(--copper-bright);
  margin-bottom:18px;
  display:flex; align-items:center; gap:10px;
}
.eyebrow::before{ content:""; width:24px; height:1px; background:var(--copper); }
.page-head h1{ font-size:clamp(30px,5vw,46px); line-height:1.08; max-width:20ch; }
.page-head .lede{ margin-top:20px; font-size:18px; color:var(--paper-dim); max-width:56ch; }
.updated{ margin-top:16px; font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--paper-dim); }

/* document body */
.doc{ padding:52px 0 90px; }
.doc h2{ font-size:24px; margin:44px 0 14px; }
.doc h2:first-child{ margin-top:0; }
.doc h3{ font-size:18px; font-weight:500; margin:28px 0 10px; }
.doc p{ color:var(--paper-dim); margin:0 0 16px; }
.doc ul,.doc ol{ color:var(--paper-dim); margin:0 0 16px; padding-left:22px; }
.doc li{ margin-bottom:8px; }
.doc strong{ color:var(--paper); font-weight:600; }
.doc .lead{ color:var(--paper); font-size:17px; }
.callout-box{
  border:1px solid var(--line);
  border-left:2px solid var(--copper);
  background:var(--panel);
  padding:18px 22px;
  margin:0 0 24px;
  font-size:14.5px;
  color:var(--paper-dim);
}
.callout-box strong{ color:var(--paper); }

/* faq */
.faq-item{ border-bottom:1px solid var(--line); padding:22px 0; }
.faq-item:first-of-type{ border-top:1px solid var(--line); }
.faq-item h3{ margin:0 0 10px; font-size:18px; font-weight:500; color:var(--paper); }
.faq-item p{ margin:0 0 10px; }
.faq-item p:last-child{ margin-bottom:0; }

/* about */
.about-grid{ display:grid; grid-template-columns:1fr; gap:40px; }
.value-row{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); margin:32px 0; }
@media (max-width:640px){ .value-row{ grid-template-columns:1fr; } }
.value{ background:var(--panel); padding:24px 22px; }
.value .v-tag{ font-family:'IBM Plex Mono', monospace; font-size:11px; color:var(--copper-bright); letter-spacing:0.04em; }
.value h3{ font-size:17px; font-weight:500; margin:10px 0 8px; color:var(--paper); }
.value p{ font-size:14px; margin:0; }

/* footer */
footer{ padding:44px 0 60px; border-top:1px solid var(--line); font-size:13px; color:var(--paper-dim); }
.foot-base{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px; }
.foot-links{ display:flex; gap:20px; flex-wrap:wrap; }
.foot-links a{ color:var(--paper-dim); text-decoration:none; }
.foot-links a:hover{ color:var(--paper); }
.foot-fine{ width:100%; max-width:70ch; font-size:12px; line-height:1.6; margin-top:8px; }
.foot-fine a{ color:var(--copper-bright); }

.back-link{ display:inline-block; margin-top:8px; font-family:'IBM Plex Mono', monospace; font-size:13px; }

/* ---------- buttons & CTA row (shared with index.html's inline copy) ---------- */
.btn{
  font-family:'IBM Plex Sans', sans-serif;
  font-size:14.5px;
  font-weight:500;
  padding:14px 26px;
  border-radius:var(--radius);
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  gap:8px;
  letter-spacing:0.01em;
}
.btn-primary{ background:var(--copper); color:var(--ink); }
.btn-primary:hover{ background:var(--copper-bright); color:var(--ink); }
.btn-ghost{ border:1px solid var(--line); color:var(--paper); }
.btn-ghost:hover{ border-color:var(--paper-dim); color:var(--paper); }
.cta-row{ margin-top:32px; display:flex; gap:16px; flex-wrap:wrap; }
.trust-strip{
  margin-top:20px;
  font-family:'IBM Plex Mono', monospace;
  font-size:12.5px;
  color:var(--paper-dim);
}

/* ---------- feature grid ---------- */
.feature-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  margin-top:36px;
}
@media (max-width:860px){ .feature-grid{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:560px){ .feature-grid{ grid-template-columns:1fr; } }
.feature{ background:var(--panel); padding:28px 24px; }
.feature .f-tag{
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  color:var(--copper-bright);
  letter-spacing:0.04em;
}
.feature h3{ font-size:18px; margin-top:12px; font-weight:500; color:var(--paper); }
.feature p{ color:var(--paper-dim); font-size:14.5px; margin-top:10px; }

/* ---------- screenshot gallery + lightbox (shared with index.html's inline copy) ---------- */
.gallery{
  margin-top:36px;
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(300px, 1fr));
  gap:20px;
}
.shot{
  border:1px solid var(--line);
  background:var(--panel);
  display:flex;
  flex-direction:column;
  overflow:hidden;
  transition:border-color 0.15s;
}
.shot:hover{ border-color:var(--paper-dim); }
.shot-img{
  background:var(--panel-2);
  height:230px;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:hidden;
}
.shot-img img{
  max-width:100%;
  max-height:100%;
  width:auto;
  height:auto;
  object-fit:contain;
  cursor:zoom-in;
}
.shot-cap{ padding:14px 16px; border-top:1px solid var(--line); }
.shot-cap strong{
  display:block;
  font-family:'IBM Plex Sans', sans-serif;
  font-size:13.5px;
  font-weight:500;
  color:var(--paper);
  margin-bottom:4px;
}
.shot-cap span{
  font-family:'IBM Plex Mono', monospace;
  font-size:12px;
  color:var(--paper-dim);
  line-height:1.5;
}
/* Screenshot not taken yet — dashed placeholder that keeps the same card layout so it
   drops straight in once a real <img> replaces it (see README-images.txt). */
.shot-placeholder{
  height:100%;
  width:100%;
  min-height:230px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:8px;
  border:1px dashed var(--paper-dim);
  margin:10px;
  color:var(--paper-dim);
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  letter-spacing:0.04em;
  text-transform:uppercase;
  text-align:center;
  padding:16px;
}
.shot-placeholder .ph-icon{ font-size:22px; font-family:'Fraunces', serif; color:var(--copper); text-transform:none; }
.shot-placeholder .ph-filename{ color:var(--copper); text-transform:none; letter-spacing:0; opacity:0.75; }

.lightbox{
  position:fixed; inset:0;
  background:rgba(18,24,26,0.92);
  z-index:100;
  display:none;
  align-items:center;
  justify-content:center;
  padding:48px;
}
@media (max-width:900px){ .lightbox{ padding:16px; } }
.lightbox.open{ display:flex; }
.lb-card{
  display:grid;
  grid-template-columns:1.8fr 1fr;
  max-width:1440px;
  width:100%;
  max-height:92vh;
  background:var(--panel);
  border:1px solid var(--line);
  overflow:hidden;
}
@media (max-width:900px){
  .lb-card{ grid-template-columns:1fr; grid-template-rows:auto 1fr; max-height:94vh; overflow-y:auto; }
}
.lb-img{ background:var(--panel-2); display:flex; align-items:center; justify-content:center; padding:20px; min-width:0; }
.lb-img img{ max-width:100%; max-height:86vh; object-fit:contain; border:1px solid var(--line); cursor:zoom-in; }
@media (max-width:900px){ .lb-img img{ max-height:56vh; } }
.lb-fullsize{
  display:inline-block;
  margin-top:10px;
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  letter-spacing:0.03em;
  color:var(--copper-bright);
  text-decoration:none;
  border-bottom:1px solid var(--copper);
  padding-bottom:1px;
}
.lb-fullsize:hover{ color:var(--paper); }
.lb-text{ padding:40px 36px; display:flex; flex-direction:column; justify-content:center; overflow-y:auto; border-left:1px solid var(--line); }
@media (max-width:800px){ .lb-text{ border-left:none; border-top:1px solid var(--line); } }
.lb-eyebrow{ font-family:'IBM Plex Mono', monospace; font-size:11px; letter-spacing:0.08em; text-transform:uppercase; color:var(--copper-bright); margin-bottom:10px; }
.lb-text h3{ font-size:22px; margin-bottom:16px; }
.lb-text p{ color:var(--paper-dim); font-size:14.5px; line-height:1.7; }
.lb-counter{ margin-top:24px; font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--paper-dim); }
.lb-close{ position:absolute; top:20px; right:24px; background:none; border:none; color:var(--paper); font-size:32px; line-height:1; cursor:pointer; z-index:2; font-family:'IBM Plex Sans', sans-serif; opacity:0.7; }
.lb-close:hover{ opacity:1; }
.lb-nav{ position:absolute; top:50%; transform:translateY(-50%); background:var(--panel); border:1px solid var(--line); color:var(--paper); font-size:22px; width:48px; height:48px; border-radius:50%; cursor:pointer; display:flex; align-items:center; justify-content:center; opacity:0.8; }
.lb-nav:hover{ opacity:1; border-color:var(--copper); }
.lb-prev{ left:16px; } .lb-next{ right:16px; }
@media (max-width:800px){ .lb-nav{ width:38px; height:38px; font-size:18px; } .lb-prev{ left:6px; } .lb-next{ right:6px; } }

/* ---------- coming-soon download notice modal (shared with index.html's inline copy) ---------- */
.form-msg{ margin-top:16px; font-size:13.5px; font-family:'IBM Plex Mono', monospace; display:none; }
.form-msg.show{ display:block; }
.form-msg.ok{ color:var(--eval-good); }
.form-msg.err{ color:var(--eval-bad); }

/* ---------- contact form (index.html only, kept here so any page can opt in) ---------- */
.form-field{ margin-bottom:18px; }
.form-field label{ display:block; font-family:'IBM Plex Mono', monospace; font-size:12px; letter-spacing:0.04em; text-transform:uppercase; color:var(--paper-dim); margin-bottom:8px; }
.form-field input, .form-field textarea{
  width:100%; background:var(--panel-2); border:1px solid var(--line); border-radius:var(--radius);
  color:var(--paper); font-family:'IBM Plex Sans', sans-serif; font-size:14.5px; padding:11px 13px;
}
.form-field textarea{ resize:vertical; min-height:120px; }
.form-field input:focus, .form-field textarea:focus{ outline:none; border-color:var(--copper); }
.form-hp{ position:absolute; left:-9999px; top:-9999px; }

/* ---------- pillar nav: cross-links between feature pages ---------- */
.pillar-grid{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  margin:36px 0 0;
}
@media (max-width:860px){ .pillar-grid{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:520px){ .pillar-grid{ grid-template-columns:1fr; } }
.pillar{
  background:var(--panel);
  padding:26px 22px;
  text-decoration:none;
  display:block;
  transition:background 0.15s;
}
.pillar:hover{ background:var(--panel-2); }
.pillar.current{ background:var(--panel-2); border-top:2px solid var(--copper); }
.pillar .p-tag{ font-family:'IBM Plex Mono', monospace; font-size:11px; color:var(--copper-bright); letter-spacing:0.04em; }
.pillar h3{ font-size:17px; margin-top:10px; font-weight:500; color:var(--paper); }
.pillar p{ font-size:13.5px; color:var(--paper-dim); margin-top:8px; line-height:1.6; }

/* ---------- repertoire / data table (Opening Coach library, etc.) ---------- */
.data-table-wrap{ margin-top:28px; overflow-x:auto; border:1px solid var(--line); }
table.data-table{ width:100%; min-width:560px; border-collapse:collapse; font-size:14px; }
table.data-table th, table.data-table td{ padding:12px 16px; text-align:left; border-bottom:1px solid var(--line); }
table.data-table thead th{
  font-family:'IBM Plex Mono', monospace; font-size:11.5px; letter-spacing:0.04em; text-transform:uppercase;
  color:var(--paper-dim); background:var(--panel-2);
}
table.data-table tbody td{ color:var(--paper-dim); }
table.data-table tbody th{ color:var(--paper); font-weight:500; background:var(--panel); white-space:nowrap; }
table.data-table tr:last-child th, table.data-table tr:last-child td{ border-bottom:none; }
table.data-table td.eco{ font-family:'IBM Plex Mono', monospace; color:var(--copper-bright); white-space:nowrap; }
.pill{
  display:inline-block; font-family:'IBM Plex Mono', monospace; font-size:10.5px; letter-spacing:0.05em; text-transform:uppercase;
  padding:2px 8px; border-radius:var(--radius); border:1px solid var(--line); color:var(--paper-dim);
}
.pill.white{ border-color:var(--paper-dim); color:var(--paper); }
.pill.black{ border-color:var(--line); background:var(--panel-2); color:var(--paper-dim); }

/* ---------- engine-territory highlight callout ---------- */
.engine-callout{
  margin:28px 0;
  border:1px solid var(--line);
  background:linear-gradient(135deg, var(--panel), var(--panel-2));
  padding:30px 32px;
  position:relative;
}
.engine-callout::before{
  content:"";
  position:absolute; left:0; top:0; bottom:0; width:3px;
  background:linear-gradient(to bottom, #4f8c74, var(--copper));
}
.engine-callout h3{ font-size:19px; color:var(--paper); }
.engine-callout p{ color:var(--paper-dim); font-size:14.5px; margin-top:10px; }
.engine-swatches{ display:flex; gap:10px; margin-top:16px; align-items:center; font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--paper-dim); }
.swatch{ width:20px; height:20px; border:1px solid var(--line); display:inline-block; }

/* ---------- pricing (shared with index.html's inline copy, used by pricing.html) ---------- */
.pricing-grid{ display:grid; grid-template-columns:repeat(auto-fit, minmax(200px, 1fr)); gap:20px; margin-top:36px; }
.plan{ border:1px solid var(--line); padding:32px 28px; background:var(--panel); display:flex; flex-direction:column; }
.plan.featured{ border-color:var(--copper); background:var(--panel-2); }
.plan .p-name{ font-family:'IBM Plex Mono', monospace; font-size:12px; letter-spacing:0.06em; text-transform:uppercase; color:var(--paper-dim); }
.plan.featured .p-name{ color:var(--copper-bright); }
.plan .p-price{ font-family:'Fraunces', serif; font-size:36px; margin-top:14px; color:var(--paper); }
.plan .p-price small{ font-size:14px; color:var(--paper-dim); font-family:'IBM Plex Sans', sans-serif; }
.plan ul{ list-style:none; padding:0; margin:22px 0; flex:1; }
.plan li{ font-size:14px; color:var(--paper-dim); padding:8px 0 8px 20px; position:relative; }
.plan li::before{ content:"—"; position:absolute; left:0; color:var(--copper); }
.plan .btn{ justify-content:center; margin-top:8px; }
.p-pill{ display:inline-block; font-family:'IBM Plex Mono', monospace; font-size:10px; letter-spacing:0.06em; text-transform:uppercase; color:var(--copper-bright); border:1px solid var(--copper); border-radius:var(--radius); padding:2px 7px; margin-left:6px; vertical-align:middle; }
.p-badge{ display:inline-block; font-family:'IBM Plex Mono', monospace; font-size:10px; letter-spacing:0.06em; text-transform:uppercase; color:var(--ink); background:var(--copper); border-radius:var(--radius); padding:3px 8px; margin-top:10px; }
.p-was{ font-size:20px; color:var(--paper-dim); text-decoration:line-through; margin-right:6px; }
.pricing-fine{ margin-top:22px; font-size:12.5px; color:var(--paper-dim); max-width:72ch; line-height:1.7; }
.pricing-fine a{ color:var(--copper-bright); }

/* ---------- comparison table (used on pricing.html) ---------- */
.compare-wrap{ margin-top:32px; overflow-x:auto; border:1px solid var(--line); }
table.compare{ width:100%; min-width:640px; border-collapse:collapse; font-size:14px; }
table.compare th, table.compare td{ padding:14px 16px; text-align:left; border-bottom:1px solid var(--line); border-right:1px solid var(--line); }
table.compare thead th{ font-family:'IBM Plex Mono', monospace; font-size:12px; letter-spacing:0.04em; text-transform:uppercase; color:var(--paper-dim); background:var(--panel-2); text-align:center; white-space:nowrap; }
table.compare tbody th{ font-weight:500; color:var(--paper); background:var(--panel); }
table.compare td{ text-align:center; color:var(--paper-dim); }
table.compare th.me, table.compare td.me{ background:rgba(198,139,89,0.08); color:var(--paper); }
table.compare thead th.me{ color:var(--copper-bright); }
table.compare td.y{ color:var(--eval-good); }
table.compare td.n{ color:var(--paper-dim); }
table.compare td.p{ color:var(--copper-bright); }
table.compare tr:last-child th, table.compare tr:last-child td{ border-bottom:none; }
table.compare th:last-child, table.compare td:last-child{ border-right:none; }
.compare-note{ margin-top:18px; font-size:13px; color:var(--paper-dim); max-width:70ch; line-height:1.7; }

/* ---------- final CTA block (used at the bottom of feature pages) ---------- */
.page-cta{ border-top:1px solid var(--line); padding:56px 0; text-align:center; }
.page-cta h2{ font-size:clamp(26px,3.6vw,36px); max-width:22ch; margin:0 auto; }
.page-cta .sub{ color:var(--paper-dim); max-width:48ch; margin:16px auto 0; }
.page-cta .cta-row{ justify-content:center; margin-top:28px; }