/* Round 15 — clearer chapter hierarchy, paragraph rhythm and record diagram. */

/* 02 and 03: use the same visible number / English title / Japanese heading hierarchy. */
#sol-wrap .sol-opening-chapter-heading,
#sol-wrap .sol-a13-heading {
  display:flex;
  align-items:flex-start;
  gap:22px;
}
#sol-wrap .sol-problem-number,
#sol-wrap .sol-a13-number {
  flex:none;
  color:#00787a;
  font:400 48px/1 Didot,'Bodoni 72',serif;
  font-variant-numeric:lining-nums tabular-nums;
}
#sol-wrap .sol-opening-chapter-heading>div,
#sol-wrap .sol-a13-heading>div { min-width:0; }
#sol-wrap .sol-opening-chapter-heading>div>p,
#sol-wrap .sol-a13-heading p {
  margin:0 0 8px;
  color:#18333f;
  font:500 30px/1.15 'Cormorant Garamond','Noto Serif JP',serif;
  letter-spacing:.12em;
}
#sol-wrap .sol-opening-chapter-heading h2,
#sol-wrap .sol-a13-heading h2 {
  margin:0;
  color:#18333f;
  font:500 clamp(25px,2vw,32px)/1.55 'Noto Serif JP',serif;
  letter-spacing:.01em;
}
#sol-wrap .sol-opening-chapter-heading h2>span,
#sol-wrap .sol-a13-heading h2>span { display:block; }
#sol-wrap .sol-problem-layout { display:block; }
#sol-wrap .sol-problem-intro {
  display:grid;
  grid-template-columns:minmax(330px,.9fr) minmax(0,1.1fr);
  gap:64px;
  align-items:end;
  margin-bottom:34px;
  padding:0 0 32px;
  border-right:0;
  border-bottom:1px solid #cbdada;
}
#sol-wrap .sol-problem-lead {
  max-width:31em;
  margin:0!important;
  color:#506167;
  font-size:15px!important;
  line-height:1.9!important;
}
#sol-wrap .sol-a13-heading {
  margin-bottom:26px;
  padding-bottom:24px;
}

/* 12: six records form one system that can be scanned before reading. */
#sol-wrap .hc15-record-map {
  margin-top:44px;
  padding:42px 48px 48px;
  color:#fff;
  background:#18333f;
}
#sol-wrap .hc15-record-heading {
  display:grid;
  grid-template-columns:minmax(250px,.72fr) minmax(0,1.28fr);
  gap:48px;
  align-items:end;
  padding-bottom:30px;
  border-bottom:1px solid rgba(255,255,255,.18);
}
#sol-wrap .hc15-record-heading div>p {
  margin:0 0 10px;
  color:#8ec6c5;
  font:700 11px/1.4 'Inter Tight',sans-serif;
  letter-spacing:.2em;
}
#sol-wrap .hc15-record-heading h3 {
  margin:0!important;
  color:#fff;
  font:500 28px/1.55 'Noto Serif JP',serif;
}
#sol-wrap .hc15-record-heading>p {
  max-width:620px;
  margin:0!important;
  color:rgba(255,255,255,.74);
  font-size:15px;
  line-height:1.9;
}
#sol-wrap .hc15-record-network {
  display:grid;
  grid-template-columns:250px minmax(0,1fr);
  gap:64px;
  align-items:stretch;
  padding-top:34px;
}
#sol-wrap .hc15-record-hub {
  position:relative;
  display:flex;
  min-height:216px;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  padding:24px;
  border:1px solid rgba(142,198,197,.55);
  text-align:center;
}
#sol-wrap .hc15-record-hub::after {
  position:absolute;
  top:50%;
  left:100%;
  width:64px;
  height:1px;
  background:rgba(142,198,197,.55);
  content:'';
}
#sol-wrap .hc15-record-hub svg { width:54px;height:54px;margin-bottom:15px;color:#8ec6c5; }
#sol-wrap .hc15-record-hub span { color:#8ec6c5;font:700 10px/1.4 'Inter Tight',sans-serif;letter-spacing:.18em; }
#sol-wrap .hc15-record-hub strong { margin-top:6px;color:#fff;font:500 21px/1.5 'Noto Serif JP',serif; }
#sol-wrap .hc15-record-hub small { margin-top:5px;color:rgba(255,255,255,.58);font-size:12px; }
#sol-wrap .hc15-record-nodes {
  position:relative;
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:28px 30px;
  margin:0;
  padding:0;
  list-style:none;
}
#sol-wrap .hc15-record-nodes::before {
  position:absolute;
  top:50%;
  right:0;
  left:-64px;
  height:1px;
  background:rgba(142,198,197,.24);
  content:'';
}
#sol-wrap .hc15-record-nodes li {
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:34px 38px minmax(0,1fr);
  gap:10px;
  align-items:start;
  min-width:0;
  padding:18px 0 16px;
  background:#18333f;
  border-top:1px solid rgba(142,198,197,.55);
}
#sol-wrap .hc15-record-nodes li::before {
  position:absolute;
  top:-4px;
  left:0;
  width:7px;
  height:7px;
  background:#8ec6c5;
  border-radius:50%;
  content:'';
}
#sol-wrap .hc15-record-number { color:#8ec6c5;font:400 21px/1.2 Didot,'Bodoni 72',serif; }
#sol-wrap .hc15-record-nodes svg { width:30px;height:30px;color:#8ec6c5; }
#sol-wrap .hc15-record-nodes h4 { margin:0 0 5px!important;color:#fff;font:600 16px/1.45 'Noto Serif JP',serif; }
#sol-wrap .hc15-record-nodes p { margin:0!important;color:rgba(255,255,255,.64);font-size:12px;line-height:1.7; }

/* 13: sentence units are semantic blocks; wrapping inside each sentence stays natural. */
#sol-wrap .sol-ct-body { max-width:620px; }
#sol-wrap .sol-ct-body>span { display:block; }
#sol-wrap .sol-ct-body>span+span { margin-top:2px; }
#sol-wrap #sol-contact>div>.sol-body {
  max-width:720px;
  margin:0 auto 30px!important;
  font-size:15px;
  line-height:1.9;
}

/* ABOUT / MESSAGE: remove the narrow newspaper columns that split meaning mid-paragraph. */
#sol-wrap #sol-about.ab8 #ab8-message .ab8-message-grid {
  grid-template-columns:minmax(360px,.92fr) minmax(0,1.08fr);
  gap:56px;
  align-items:start;
}
#sol-wrap #sol-about.ab8 #ab8-message .ab8-columns {
  max-width:720px;
  margin:42px auto 0!important;
  columns:1;
}
#sol-wrap #sol-about.ab8 #ab8-message .ab8-columns p { max-width:720px; }
#sol-wrap #sol-about.ab8 #ab8-message .ab8-sign { max-width:720px;margin:26px auto 0!important; }

@media(max-width:1100px) {
  #sol-wrap .sol-problem-intro { grid-template-columns:minmax(300px,.95fr) minmax(0,1.05fr);gap:40px; }
  #sol-wrap .sol-opening-chapter-heading>div>p,
  #sol-wrap .sol-a13-heading p { font-size:27px; }
  #sol-wrap .hc15-record-network { grid-template-columns:220px minmax(0,1fr);gap:44px; }
  #sol-wrap .hc15-record-hub::after { width:44px; }
  #sol-wrap .hc15-record-nodes { grid-template-columns:repeat(2,minmax(0,1fr)); }
  #sol-wrap .hc15-record-nodes::before { left:-44px; }
}

@media(max-width:768px) {
  #sol-wrap .sol-problem-intro { display:block;margin-bottom:30px;padding-bottom:26px; }
  #sol-wrap .sol-problem-lead { margin-top:18px!important;font-size:16px!important; }
}

@media(max-width:700px) {
  #sol-wrap .sol-opening-chapter-heading,
  #sol-wrap .sol-a13-heading { gap:14px; }
  #sol-wrap .sol-problem-number,
  #sol-wrap .sol-a13-number { font-size:40px; }
  #sol-wrap .sol-opening-chapter-heading>div>p,
  #sol-wrap .sol-a13-heading p { margin-bottom:6px;font-size:25px; }
  #sol-wrap .sol-opening-chapter-heading h2,
  #sol-wrap .sol-a13-heading h2 { font-size:24px;line-height:1.55; }
  #sol-wrap .sol-problem-intro { padding-right:0; }
  #sol-wrap .hc15-record-map { margin-top:34px;padding:34px 20px 38px; }
  #sol-wrap .hc15-record-heading { grid-template-columns:1fr;gap:18px;padding-bottom:26px; }
  #sol-wrap .hc15-record-heading h3 { font-size:25px; }
  #sol-wrap .hc15-record-heading>p { font-size:15px; }
  #sol-wrap .hc15-record-network { grid-template-columns:1fr;gap:28px;padding-top:28px; }
  #sol-wrap .hc15-record-hub { min-height:190px; }
  #sol-wrap .hc15-record-hub::after { top:100%;left:50%;width:1px;height:28px; }
  #sol-wrap .hc15-record-nodes { grid-template-columns:1fr;gap:0; }
  #sol-wrap .hc15-record-nodes::before { display:none; }
  #sol-wrap .hc15-record-nodes li { grid-template-columns:38px 42px minmax(0,1fr);padding:20px 0; }
  #sol-wrap .hc15-record-nodes h4 { font-size:17px; }
  #sol-wrap .hc15-record-nodes p { font-size:14px; }
  #sol-wrap .sol-ct-body>span+span { margin-top:6px; }
  #sol-wrap #sol-about.ab8 #ab8-message .ab8-message-grid { grid-template-columns:1fr;gap:28px; }
  #sol-wrap #sol-about.ab8 #ab8-message .ab8-columns { margin-top:30px!important; }
}

@media(max-width:480px) {
  #sol-wrap .hc15-record-hub {
    display:grid;
    grid-template-columns:48px minmax(0,1fr);
    grid-template-rows:auto auto auto;
    column-gap:16px;
    min-height:126px;
    padding:22px;
    text-align:left;
  }
  #sol-wrap .hc15-record-hub svg {
    grid-row:1/4;
    width:44px;
    height:44px;
    margin:0;
  }
  #sol-wrap .hc15-record-hub span,
  #sol-wrap .hc15-record-hub strong,
  #sol-wrap .hc15-record-hub small { grid-column:2; }
  #sol-wrap .hc15-record-hub strong { margin-top:2px;font-size:19px; }
  #sol-wrap .hc15-record-hub small { margin-top:2px; }
  #sol-wrap .hc15-record-nodes {
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:0 18px;
  }
  #sol-wrap .hc15-record-nodes li {
    grid-template-columns:32px minmax(0,1fr);
    grid-template-rows:34px auto;
    gap:8px;
    align-content:start;
    min-height:142px;
    padding:18px 0 14px;
  }
  #sol-wrap .hc15-record-nodes svg { grid-column:2;grid-row:1;width:28px;height:28px; }
  #sol-wrap .hc15-record-nodes li>div { grid-column:1/-1; }
  #sol-wrap .hc15-record-nodes h4 { margin-bottom:5px!important;font-size:16px; }
  #sol-wrap .hc15-record-nodes p { font-size:13px;line-height:1.65; }
}