/* ============================================================
   Birthday Color Cafein — Blog stylesheet
   Shared by all /blog/*.html pages.
   ============================================================ */
:root{
  --paper:#f6f3ec;
  --paper-2:#fbfaf5;
  --ink:#1a1a1a;
  --ink-2:#555;
  --ink-3:#888;
  --line: rgba(0,0,0,.08);
  --line-2: rgba(0,0,0,.04);
  --accent:#1a237e;
  --ease: cubic-bezier(.2,.7,.2,1);
  --maxw: 720px;
  --font-sans: "Inter","Noto Sans SC","Noto Sans JP","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-display: "Inter","Noto Sans SC","Noto Sans JP","PingFang SC","Hiragino Sans GB",system-ui,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--font-sans);
  color:var(--ink);
  background:var(--paper);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  font-feature-settings:"ss01","cv11";
}
h1,h2,h3,h4{font-weight:700;margin:0;letter-spacing:-.01em}
a{color:inherit}

/* ---------- Top header ---------- */
header.top{
  padding:12px clamp(14px,3vw,40px);
  border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  background:rgba(246,243,236,.92);
  position:sticky;top:0;z-index:20;
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-icon{font-size:22px}
.brand .brand-name{
  font-family:var(--font-display);
  font-size:16px;font-weight:800;letter-spacing:-.01em;
  margin:0;color:var(--ink);
}
.top-nav{display:flex;gap:18px}
.top-nav a{
  text-decoration:none;font-size:13px;font-weight:600;
  color:var(--ink-2);padding:6px 0;
  border-bottom:2px solid transparent;
  transition:color .2s,border-color .2s;
}
.top-nav a:hover{color:var(--ink)}
.top-nav a.active{color:var(--ink);border-bottom-color:var(--ink)}

/* ---------- Article ---------- */
article.post{
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(36px,6vw,72px) clamp(20px,5vw,40px) 24px;
}
.breadcrumbs{
  font-size:12px;letter-spacing:.06em;
  color:var(--ink-3);margin-bottom:22px;
}
.breadcrumbs a{text-decoration:none;color:var(--ink-3)}
.breadcrumbs a:hover{color:var(--ink)}
.breadcrumbs .sep{margin:0 8px;opacity:.5}

.post-meta{
  display:flex;align-items:center;flex-wrap:wrap;gap:14px;
  font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-3);margin-bottom:18px;
}
.post-meta .cat{
  display:inline-block;padding:4px 12px;
  background:var(--ink);color:#fff;text-decoration:none;
  border-radius:999px;font-weight:700;letter-spacing:.18em;
}
.post-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--ink-3)}

article h1{
  font-family:var(--font-display);
  font-size:clamp(30px,4.6vw,46px);
  line-height:1.12;letter-spacing:-.02em;
  font-weight:800;margin-bottom:18px;
  color:var(--ink);
}
.lede{
  font-size:clamp(17px,2vw,19px);
  line-height:1.6;color:var(--ink-2);
  margin:0 0 24px;
  font-weight:400;
}

/* ---------- Author bio card (E-E-A-T) ---------- */
.author-card{
  display:flex;align-items:flex-start;gap:14px;
  margin:0 0 36px;padding:14px 18px;
  background:#fff;border:1px solid var(--line);
  border-radius:12px;
}
.author-card .avatar{
  flex:0 0 auto;
  width:46px;height:46px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#1a237e,#3949ab);
  color:#fff;font-family:var(--font-display);
  font-weight:800;font-size:15px;letter-spacing:.04em;
}
.author-card .meta{flex:1;min-width:0}
.author-card .name{
  font-family:var(--font-display);
  font-size:14.5px;font-weight:800;color:var(--ink);
  line-height:1.3;
}
.author-card .role{
  font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);font-weight:700;margin-top:2px;
}
.author-card .bio{
  margin-top:6px;font-size:13.5px;line-height:1.55;
  color:var(--ink-2);
}
.author-card .bio a.author-link{
  color:var(--accent);text-decoration:none;font-weight:600;
  border-bottom:1px solid rgba(26,35,126,.3);
  margin-left:4px;white-space:nowrap;
}
.author-card .bio a.author-link:hover{border-bottom-color:var(--accent)}
@media(max-width:640px){
  .author-card{padding:12px 14px;gap:12px}
  .author-card .avatar{width:40px;height:40px;font-size:13px}
  .author-card .name{font-size:14px}
  .author-card .bio{font-size:13px}
}

.post-body{
  font-size:17px;line-height:1.8;color:var(--ink);
}
.post-body > * + *{margin-top:1.2em}
.post-body p{margin:0;color:#222}
.post-body h2{
  font-family:var(--font-display);
  font-size:clamp(22px,2.8vw,28px);
  line-height:1.25;letter-spacing:-.01em;
  font-weight:800;margin-top:2em;margin-bottom:.4em;
  color:var(--ink);
}
.post-body h3{
  font-family:var(--font-display);
  font-size:clamp(18px,2.2vw,22px);
  line-height:1.3;letter-spacing:-.005em;
  font-weight:700;margin-top:1.6em;margin-bottom:.3em;
  color:var(--ink);
}
.post-body a{
  color:var(--ink);text-decoration:underline;
  text-decoration-color:rgba(0,0,0,.25);
  text-underline-offset:3px;
  transition:text-decoration-color .2s;
}
.post-body a:hover{text-decoration-color:var(--ink)}
.post-body strong{color:var(--ink);font-weight:700}
.post-body em{font-style:italic}
.post-body ul, .post-body ol{
  padding-left:1.4em;margin:0;
}
.post-body li{margin-bottom:.5em;line-height:1.7}
.post-body li::marker{color:var(--ink-3)}
.post-body blockquote{
  margin:0;padding:6px 22px;
  border-left:3px solid var(--ink);
  font-family:var(--font-display);
  font-size:18px;line-height:1.7;
  color:var(--ink-2);font-weight:500;
}
.post-body code{
  font-family:"SF Mono",Menlo,Consolas,monospace;
  font-size:.92em;
  background:rgba(0,0,0,.05);
  padding:2px 6px;border-radius:4px;
}
.post-body pre{
  margin:1.6em 0;padding:18px 20px;
  background:#1f2128;color:#f1f1ef;
  border-radius:8px;overflow-x:auto;
  font-family:"SF Mono",Menlo,Consolas,monospace;
  font-size:13.5px;line-height:1.7;
  white-space:pre;
}
.post-body pre code{
  background:transparent;padding:0;
  color:inherit;font-size:inherit;border-radius:0;
}
.post-body hr{
  border:0;border-top:1px solid var(--line);
  margin:2.5em 0;
}
.post-body table{
  width:100%;border-collapse:collapse;
  font-size:14.5px;line-height:1.6;
}
.post-body th, .post-body td{
  border-bottom:1px solid var(--line);
  padding:11px 10px;text-align:left;vertical-align:top;
}
.post-body th{
  font-family:var(--font-display);
  font-size:11.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-3);
  font-weight:700;background:var(--paper-2);
}
.post-body td:first-child{font-weight:600;color:var(--ink)}

/* Pull-quote / callout */
.callout{
  margin:2.2em 0;padding:24px 26px;
  background:#fff;border:1px solid var(--line);
  border-left:3px solid var(--ink);
  border-radius:6px;
}
.callout p{margin:0 0 10px;font-size:15.5px;line-height:1.65;color:var(--ink-2)}
.callout p:last-child{margin-bottom:0}
.callout strong{color:var(--ink)}
.callout.accent{border-left-color:var(--accent)}

/* Date finder embedded */
.cta-card{
  margin:2.6em 0 .4em;
  background:#fff;border:1px solid var(--line);
  border-radius:14px;
  padding:26px 28px 28px;
  box-shadow:0 4px 24px rgba(0,0,0,.04);
}
.cta-card .cta-title{
  font-family:var(--font-display);
  font-size:18px;font-weight:800;
  margin-bottom:6px;color:var(--ink);
}
.cta-card .cta-sub{
  font-size:14px;color:var(--ink-2);
  margin-bottom:16px;line-height:1.55;
}
.cta-row{
  display:flex;gap:8px;align-items:stretch;flex-wrap:nowrap;
}
.cta-row select{
  flex:1 1 0;min-width:0;
  font-family:inherit;font-size:14.5px;font-weight:600;
  padding:11px 12px;border:1px solid var(--line);border-radius:10px;
  background:#fafafa;color:var(--ink);cursor:pointer;
  appearance:none;-webkit-appearance:none;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path fill='%23555' d='M6 8L0 0h12z'/></svg>");
  background-repeat:no-repeat;background-position:right 12px center;
  padding-right:30px;
}
.cta-row select:focus{outline:none;border-color:var(--ink)}
.cta-row .cta-go{
  flex:0 0 auto;padding:11px 20px;
  font-family:var(--font-display);font-size:13px;font-weight:700;
  letter-spacing:.08em;text-transform:uppercase;
  background:var(--ink);color:#fff;
  border:0;border-radius:10px;cursor:pointer;
  transition:opacity .2s,transform .15s;
  text-decoration:none;display:inline-flex;align-items:center;
}
.cta-row .cta-go:hover{opacity:.85;transform:translateY(-1px)}

/* Ad slot */
.ad-slot{
  display:flex;justify-content:center;align-items:center;
  padding:24px 16px;margin:2.4em 0;
  background:var(--paper-2);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.ad-slot-desktop{display:flex}
.ad-slot-mobile{display:none}
@media(max-width:768px){
  .ad-slot-desktop{display:none}
  .ad-slot-mobile{display:flex}
}

/* Related posts */
.post-footer{
  max-width:var(--maxw);
  margin:60px auto 0;
  padding:32px clamp(20px,5vw,40px);
  border-top:1px solid var(--line);
}
.post-footer h3{
  font-size:11.5px;letter-spacing:.3em;text-transform:uppercase;
  color:var(--ink-3);font-weight:700;
  margin-bottom:18px;
}
.related{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:14px;
}
.related a{
  background:#fff;border:1px solid var(--line);
  border-radius:10px;
  padding:16px 18px;
  text-decoration:none;color:var(--ink);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease);
  display:flex;flex-direction:column;
}
.related a:hover{
  transform:translateY(-2px);
  box-shadow:0 6px 20px rgba(0,0,0,.05);
}
.related .r-cat{
  font-size:10px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--ink-3);font-weight:700;margin-bottom:6px;
}
.related .r-title{
  font-family:var(--font-display);
  font-size:14.5px;line-height:1.35;
  font-weight:700;letter-spacing:-.005em;
}
@media(max-width:720px){
  .related{grid-template-columns:1fr;gap:8px}
  .related a{padding:14px 16px}
}

/* Site footer */
footer.site-footer{
  text-align:center;color:var(--ink-3);
  font-size:11px;letter-spacing:.2em;
  padding:36px 20px 42px;
  margin-top:30px;
  border-top:1px solid var(--line);
}
footer.site-footer a{
  color:var(--ink-2);text-decoration:none;
  border-bottom:1px dotted #bbb;
}
footer.site-footer .row{margin-bottom:10px}

/* Cookie consent */
.cookie-consent{
  position:fixed;bottom:0;left:0;right:0;z-index:9999;
  background:rgba(26,26,26,.95);color:#eee;backdrop-filter:blur(8px);
  padding:16px clamp(16px,4vw,40px);display:flex;align-items:center;
  justify-content:center;gap:16px;flex-wrap:wrap;font-size:13px;
  line-height:1.5;box-shadow:0 -2px 20px rgba(0,0,0,.15);
  transform:translateY(100%);transition:transform .4s ease;
}
.cookie-consent.show{transform:translateY(0)}
.cookie-consent a{color:#90caf9;text-decoration:underline}
.cookie-consent button{
  border:0;border-radius:6px;padding:9px 22px;font-size:13px;
  font-weight:600;cursor:pointer;white-space:nowrap;
  min-width:96px;font-family:inherit;
}
.cc-accept{background:#fff;color:#1a1a1a}
.cc-accept:hover{background:#e8e8e8}
.cc-decline{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.7)}
.cc-decline:hover{background:rgba(255,255,255,.12);border-color:#fff}

/* ---------- Phone ---------- */
@media(max-width:640px){
  header.top{padding:12px 16px}
  .brand .brand-name{font-size:15px}
  .top-nav{gap:12px}
  .top-nav a{font-size:12px}
  article.post{padding:28px 18px 16px}
  article h1{font-size:clamp(26px,7vw,32px)}
  .lede{font-size:16px;margin-bottom:28px}
  .post-body{font-size:16px;line-height:1.75}
  .post-body h2{font-size:clamp(20px,5.6vw,24px)}
  .post-body h3{font-size:clamp(17px,4.6vw,20px)}
  .post-body blockquote{font-size:16px;padding:4px 16px}
  .callout{padding:20px 22px;margin:2em 0}
  .cta-card{padding:22px 22px 24px}
  .cta-row{flex-wrap:wrap;gap:6px}
  .cta-row select{font-size:14px;padding:10px 12px;padding-right:28px;flex:1 1 calc(50% - 3px)}
  .cta-row .cta-go{padding:10px 16px;font-size:12px;flex:1 1 100%;justify-content:center;margin-top:4px}
  .post-footer{padding:24px 18px}
  .post-body table{font-size:13.5px}
  .post-body th, .post-body td{padding:9px 8px}
}

/* ---------- Index page only ---------- */
.blog-hero{
  text-align:center;
  padding:clamp(48px,8vw,80px) clamp(16px,4vw,48px) clamp(20px,3vw,32px);
  border-bottom:1px solid var(--line);
}
.blog-hero h1{
  font-family:var(--font-display);
  font-size:clamp(34px,5vw,52px);
  font-weight:900;letter-spacing:-.02em;
  margin:0 0 12px;
}
.blog-hero p{
  font-size:clamp(15px,1.8vw,17px);
  line-height:1.7;color:var(--ink-2);
  max-width:560px;margin:0 auto;
}
.blog-list{
  max-width:920px;margin:0 auto;
  padding:clamp(36px,5vw,56px) clamp(20px,5vw,40px);
}
.blog-card{
  display:block;text-decoration:none;color:var(--ink);
  padding:26px 0;border-bottom:1px solid var(--line);
  transition:opacity .2s;
}
.blog-card:hover{opacity:.7}
.blog-card .bc-meta{
  display:flex;gap:12px;align-items:center;
  font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-3);margin-bottom:10px;
}
.blog-card .bc-cat{
  background:var(--ink);color:#fff;
  padding:3px 10px;border-radius:999px;
  font-weight:700;letter-spacing:.16em;
}
.blog-card h2{
  font-family:var(--font-display);
  font-size:clamp(22px,3vw,30px);
  line-height:1.2;letter-spacing:-.01em;
  font-weight:800;margin-bottom:10px;
}
.blog-card p{
  margin:0;color:var(--ink-2);
  font-size:15.5px;line-height:1.65;
  max-width:680px;
}
@media(max-width:640px){
  .blog-list{padding:24px 18px}
  .blog-card{padding:22px 0}
  .blog-card h2{font-size:21px}
  .blog-card p{font-size:14.5px}
}

/* ---------- Author note (E-E-A-T personal-experience callout) ---------- */
.author-note{
  margin:32px 0;
  padding:22px 24px 20px;
  background:#fffaf0;
  border-left:3px solid #c9a961;
  border-radius:8px;
  position:relative;
}
.author-note .an-tag{
  display:inline-block;
  font-size:10.5px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:#8a6d2b;
  margin-bottom:10px;
}
.author-note .an-body{
  font-size:15.5px;line-height:1.78;color:var(--ink-2);
}
.author-note .an-body p{margin:0 0 10px}
.author-note .an-body p:last-child{margin-bottom:0}
.author-note .an-body em{color:var(--ink);font-style:italic}
.post-body .author-note a{color:var(--accent)}