/* DR SEO Hub — research / guide / comparison / calculator pages.
   Rides on the live theme stylesheet (styles.css) for nav, hero, footer,
   kicker, h-display, lede, wrap, section tokens. This file adds the
   content-layer components. */

/* ============ PROSE ============ */
.hub-prose{
  max-width:780px; margin:0 auto;
  font-family:var(--font-body,'Inter',system-ui,sans-serif);
  color:var(--ink,#0B0F17); font-size:16.5px; line-height:1.78;
}
.hub-prose > * + *{ margin-top:20px; }
.hub-prose h2{
  margin:54px 0 14px; padding-top:24px;
  border-top:1px solid var(--line,rgba(11,15,23,0.08));
  font-family:var(--font-display,'Anton','Inter',sans-serif);
  font-size:clamp(26px,3vw,36px); font-weight:400; line-height:1.08;
  letter-spacing:.3px; text-transform:uppercase; color:var(--ink,#0B0F17);
}
.hub-prose h2:first-child{ margin-top:0; padding-top:0; border-top:none; }
.hub-prose h3{
  margin:32px 0 8px; font-size:18.5px; font-weight:800; line-height:1.35;
  color:var(--ink,#0B0F17); letter-spacing:-.1px;
}
.hub-prose p{ margin:0 0 16px; color:var(--ink-2,rgba(11,15,23,0.74)); }
.hub-prose p:last-child{ margin-bottom:0; }
.hub-prose strong{ color:var(--ink,#0B0F17); font-weight:700; }
.hub-prose a{
  color:var(--accent,#FF2AA6); text-decoration:underline;
  text-decoration-thickness:1px; text-underline-offset:3px;
}
.hub-prose a:hover{ color:var(--accent-dark,#D91A87); }
.hub-prose ul,.hub-prose ol{
  margin:0 0 18px; padding-left:24px; color:var(--ink-2,rgba(11,15,23,0.74));
}
.hub-prose li{ margin-bottom:8px; line-height:1.7; }
.hub-prose li::marker{ color:var(--accent,#FF2AA6); }

/* ============ PAGE HEADER TWEAKS ============ */
.page-hd--hub{ padding:clamp(64px,8vw,104px) 0 clamp(36px,5vw,56px); }
.page-hd--hub .h-display{ font-size:clamp(40px,6.5vw,82px); }
.page-hd--hub .meta{
  margin-top:14px; font-size:13px; letter-spacing:1.2px;
  text-transform:uppercase; color:var(--inv-3,rgba(255,255,255,0.5));
}

/* ============ HUB CARD GRID ============ */
.hub-grid{
  display:grid; grid-template-columns:repeat(3,1fr); gap:18px;
  max-width:1100px; margin:0 auto;
}
.hub-card{
  display:flex; flex-direction:column; gap:8px;
  padding:28px 26px; background:var(--bg-light,#FFF);
  border:1px solid var(--line,rgba(11,15,23,0.08)); border-radius:18px;
  text-decoration:none; color:var(--ink,#0B0F17);
  transition:transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.hub-card:hover{
  transform:translateY(-4px);
  box-shadow:0 18px 44px rgba(11,15,23,0.10);
  border-color:rgba(255,42,166,0.30);
}
.hub-card__tag{
  font-size:11px; font-weight:800; letter-spacing:1.4px;
  text-transform:uppercase; color:var(--accent,#FF2AA6);
}
.hub-card__title{
  font-family:var(--font-display,'Anton',sans-serif); font-weight:400;
  font-size:22px; line-height:1.1; text-transform:uppercase;
  letter-spacing:.3px; color:var(--ink,#0B0F17);
}
.hub-card__desc{ font-size:14.5px; line-height:1.6; color:var(--ink-2,rgba(11,15,23,0.66)); }
.hub-card__go{
  margin-top:auto; padding-top:10px; font-size:13px; font-weight:800;
  letter-spacing:.4px; color:var(--accent,#FF2AA6);
}

/* ============ SPEC TABLE (CAS / formula / MW) ============ */
.spec-table{
  width:100%; border-collapse:collapse; margin:8px 0 4px;
  border:1px solid var(--line,rgba(11,15,23,0.08)); border-radius:14px;
  overflow:hidden;
}
.spec-table tr{ border-bottom:1px solid var(--line,rgba(11,15,23,0.08)); }
.spec-table tr:last-child{ border-bottom:none; }
.spec-table th{
  text-align:left; width:42%; padding:14px 18px;
  background:rgba(11,15,23,0.025); font-size:13px; font-weight:800;
  letter-spacing:.6px; text-transform:uppercase; color:var(--ink,#0B0F17);
  vertical-align:top;
}
.spec-table td{
  padding:14px 18px; font-size:15px; color:var(--ink-2,rgba(11,15,23,0.78));
}

/* ============ COMPARISON TABLE ============ */
.cmp-table{
  width:100%; border-collapse:collapse; margin:22px 0;
  border:1px solid var(--line,rgba(11,15,23,0.08)); border-radius:16px;
  overflow:hidden; font-size:14.5px;
}
.cmp-table th,.cmp-table td{
  padding:15px 16px; border-bottom:1px solid var(--line,rgba(11,15,23,0.08));
  text-align:left; vertical-align:top;
}
.cmp-table thead th{
  background:var(--bg-dark,#0B0F17); color:#FFF;
  font-family:var(--font-display,'Anton',sans-serif); font-weight:400;
  font-size:15px; text-transform:uppercase; letter-spacing:.5px;
}
.cmp-table tbody th{
  background:rgba(11,15,23,0.025); font-weight:800; color:var(--ink,#0B0F17);
  font-size:13.5px;
}
.cmp-table td{ color:var(--ink-2,rgba(11,15,23,0.76)); }
.cmp-table tr:last-child th,.cmp-table tr:last-child td{ border-bottom:none; }
.cmp-table .cmp-accent{ color:var(--accent-dark,#D91A87); font-weight:700; }

/* ============ CALLOUT ============ */
.hub-callout{
  margin:26px 0; padding:24px 28px;
  background:var(--accent-soft,rgba(255,42,166,0.07));
  border:1px solid rgba(255,42,166,0.16);
  border-left:4px solid var(--accent,#FF2AA6); border-radius:14px;
}
.hub-callout strong:first-child{
  display:block; margin-bottom:6px; font-size:13px; letter-spacing:1.1px;
  text-transform:uppercase; color:var(--accent-dark,#D91A87); font-weight:800;
}
.hub-callout p{ margin:0; color:var(--ink-2,rgba(11,15,23,0.78)); }
.hub-callout--warn{
  background:rgba(255,184,0,0.07); border-color:rgba(255,184,0,0.28);
  border-left-color:#E6A02C;
}
.hub-callout--warn strong:first-child{ color:#B07210; }

/* ============ FAQ ACCORDION ============ */
.hub-faq{ max-width:780px; margin:0 auto; }
.hub-faq details{
  border:1px solid var(--line,rgba(11,15,23,0.08)); border-radius:14px;
  margin-bottom:12px; background:var(--bg-light,#FFF); overflow:hidden;
}
.hub-faq summary{
  list-style:none; cursor:pointer; padding:18px 22px;
  font-weight:700; font-size:16px; color:var(--ink,#0B0F17);
  display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.hub-faq summary::-webkit-details-marker{ display:none; }
.hub-faq summary::after{
  content:'+'; font-size:22px; color:var(--accent,#FF2AA6);
  font-weight:400; line-height:1; flex:none;
}
.hub-faq details[open] summary::after{ content:'\2212'; }
.hub-faq details[open] summary{ border-bottom:1px solid var(--line,rgba(11,15,23,0.08)); }
.hub-faq__body{ padding:16px 22px 20px; color:var(--ink-2,rgba(11,15,23,0.76)); font-size:15px; line-height:1.7; }
.hub-faq__body p{ margin:0 0 12px; }
.hub-faq__body p:last-child{ margin-bottom:0; }

/* ============ HOWTO STEPS ============ */
.hub-steps{ display:grid; gap:12px; margin:22px 0; }
.hub-step{
  display:flex; gap:16px; padding:20px 22px;
  background:var(--bg-light,#FFF); border:1px solid var(--line,rgba(11,15,23,0.08));
  border-radius:14px;
}
.hub-step__num{
  flex:none; width:34px; height:34px; border-radius:999px;
  background:var(--accent,#FF2AA6); color:#FFF;
  display:flex; align-items:center; justify-content:center;
  font-weight:800; font-size:15px;
}
.hub-step__txt h3{ margin:0 0 4px; font-size:16.5px; font-weight:800; color:var(--ink,#0B0F17); }
.hub-step__txt p{ margin:0; font-size:14.5px; line-height:1.65; color:var(--ink-2,rgba(11,15,23,0.74)); }

/* ============ CALCULATOR ============ */
.calc{
  max-width:760px; margin:0 auto; padding:30px;
  background:var(--bg-light,#FFF); border:1px solid var(--line,rgba(11,15,23,0.08));
  border-radius:20px; box-shadow:0 8px 30px rgba(11,15,23,0.06);
}
.calc + .calc{ margin-top:28px; }
.calc__title{
  font-family:var(--font-display,'Anton',sans-serif); font-weight:400;
  font-size:24px; text-transform:uppercase; letter-spacing:.4px;
  color:var(--ink,#0B0F17); margin:0 0 4px;
}
.calc__sub{ font-size:14px; color:var(--ink-3,rgba(11,15,23,0.55)); margin:0 0 22px; }
.calc__row{ display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-bottom:16px; }
.calc__field label{
  display:block; font-size:12.5px; font-weight:800; letter-spacing:.6px;
  text-transform:uppercase; color:var(--ink,#0B0F17); margin-bottom:7px;
}
.calc__field input,.calc__field select{
  width:100%; box-sizing:border-box; padding:13px 14px;
  border:1px solid var(--line-2,rgba(11,15,23,0.18)); border-radius:11px;
  font:600 16px 'Inter',system-ui,sans-serif; color:var(--ink,#0B0F17);
  background:#FFF; -webkit-appearance:none; appearance:none;
}
.calc__field input:focus,.calc__field select:focus{
  outline:none; border-color:var(--accent,#FF2AA6);
  box-shadow:0 0 0 3px rgba(255,42,166,0.14);
}
.calc__out{
  margin-top:22px; padding:22px 24px; border-radius:14px;
  background:var(--bg-dark,#0B0F17); color:#FFF;
}
.calc__out-row{
  display:flex; justify-content:space-between; align-items:baseline; gap:14px;
  padding:9px 0; border-bottom:1px solid rgba(255,255,255,0.08);
}
.calc__out-row:last-child{ border-bottom:none; }
.calc__out-label{ font-size:13px; letter-spacing:.5px; text-transform:uppercase; color:rgba(255,255,255,0.6); font-weight:700; }
.calc__out-val{ font-family:var(--font-display,'Anton',sans-serif); font-weight:400; font-size:26px; color:var(--accent,#FF2AA6); }
.calc__out-val small{ font-size:14px; color:rgba(255,255,255,0.6); font-family:'Inter',sans-serif; margin-left:3px; }

/* ============ CROSS-LINK ROW ============ */
.hub-xlinks{
  display:grid; grid-template-columns:repeat(3,1fr); gap:14px;
  max-width:1000px; margin:0 auto;
}
.hub-xlink{
  display:block; padding:18px 20px; border-radius:14px;
  background:var(--bg-light,#FFF); border:1px solid var(--line,rgba(11,15,23,0.08));
  text-decoration:none; transition:border-color .2s, transform .2s;
}
.hub-xlink:hover{ border-color:rgba(255,42,166,0.3); transform:translateY(-2px); }
.hub-xlink span{ display:block; font-size:11px; font-weight:800; letter-spacing:1.2px; text-transform:uppercase; color:var(--accent,#FF2AA6); margin-bottom:4px; }
.hub-xlink strong{ font-size:15.5px; color:var(--ink,#0B0F17); font-weight:700; }

/* ============ CTA BLOCK ============ */
.hub-cta{
  margin:0 auto; max-width:780px; text-align:center;
  padding:40px 36px; border-radius:22px;
  background:var(--bg-dark,#0B0F17); color:#FFF; position:relative; overflow:hidden;
}
.hub-cta::before{
  content:''; position:absolute; inset:-50% -10% auto auto;
  width:60%; height:200%;
  background:radial-gradient(closest-side,rgba(255,42,166,0.34),transparent 70%);
  pointer-events:none;
}
.hub-cta h2{
  position:relative; margin:0 0 10px; border:none; padding:0;
  font-family:var(--font-display,'Anton',sans-serif); font-weight:400;
  font-size:clamp(24px,3vw,34px); text-transform:uppercase; color:#FFF;
}
.hub-cta p{ position:relative; margin:0 0 22px; color:rgba(255,255,255,0.72); font-size:15.5px; }
.hub-cta__btn{
  position:relative; display:inline-block; padding:15px 32px; border-radius:12px;
  background:linear-gradient(135deg,#FF2AA6,#D91A87); color:#FFF;
  font-weight:800; font-size:14px; letter-spacing:.6px; text-transform:uppercase;
  text-decoration:none; box-shadow:0 8px 24px rgba(255,42,166,0.4);
  transition:transform .15s, box-shadow .25s;
}
.hub-cta__btn:hover{ transform:translateY(-2px); box-shadow:0 14px 34px rgba(255,42,166,0.6); }

/* ============ RUO NOTICE ============ */
.hub-ruo{
  max-width:780px; margin:40px auto 0; padding:18px 22px;
  border:1px dashed rgba(11,15,23,0.18); border-radius:12px;
  font-size:13px; line-height:1.6; color:var(--ink-3,rgba(11,15,23,0.55));
}
.hub-ruo strong{ color:var(--ink-2,rgba(11,15,23,0.7)); }

/* ============ RESPONSIVE ============ */
@media (max-width:880px){
  .hub-grid{ grid-template-columns:1fr 1fr; }
  .hub-xlinks{ grid-template-columns:1fr; }
}
@media (max-width:620px){
  .hub-grid{ grid-template-columns:1fr; }
  .calc__row{ grid-template-columns:1fr; }
  .hub-prose{ font-size:16px; }
  .cmp-table{ font-size:13px; }
  .cmp-table th,.cmp-table td{ padding:11px 10px; }
  .spec-table th{ width:46%; }
}