/* Math4ChildrenPlus.com — Blog Stylesheet */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700;800;900&family=Lato:wght@400;700&family=Merriweather:wght@400;700&display=swap');

:root{
  --brand:#E84545;--accent:#2C7BE5;--gold:#F5A623;--green:#27AE60;
  --dark:#1A1A2E;--mid:#555577;--light:#F7F8FC;--white:#fff;--border:#E8EAF0;
  --font:'Poppins',sans-serif;--body:'Merriweather',Georgia,serif;--ui:'Lato',sans-serif;
  --radius:10px;--shadow:0 4px 20px rgba(0,0,0,.09);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:var(--body);background:var(--light);color:var(--dark);line-height:1.7;}

/* NAV placeholder */
#nav-ph a,#m4c-nav-wrap a{text-decoration:none;}

/* BREADCRUMB */
.breadcrumb{display:flex;gap:.4rem;align-items:center;font-family:var(--ui);font-size:.8rem;color:var(--mid);padding:.75rem 0;flex-wrap:wrap;}
.breadcrumb a{color:var(--mid);text-decoration:none;}.breadcrumb a:hover{color:var(--accent);}
.breadcrumb-sep{opacity:.4;}

/* ARTICLE LAYOUT */
.blog-layout{max-width:1160px;margin:0 auto;padding:2rem 1.5rem 4rem;display:grid;grid-template-columns:1fr 320px;gap:2.5rem;}
@media(max-width:900px){.blog-layout{grid-template-columns:1fr;}}

/* ARTICLE */
article{background:var(--white);border-radius:16px;box-shadow:var(--shadow);overflow:hidden;}
.article-hero{height:340px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;background:var(--dark);}
.article-hero-svg{width:100%;height:100%;position:absolute;inset:0;}
.article-hero-overlay{position:relative;z-index:2;padding:2rem;text-align:center;max-width:700px;}
.article-tag{display:inline-block;background:var(--brand);color:white;font-family:var(--font);font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:1.5px;padding:.25rem .8rem;border-radius:999px;margin-bottom:.75rem;}
.article-hero h1{font-family:var(--font);font-size:clamp(1.5rem,3.5vw,2.4rem);font-weight:900;color:white;line-height:1.2;}
.article-meta{display:flex;gap:1rem;align-items:center;flex-wrap:wrap;padding:1rem 2rem;border-bottom:1px solid var(--border);font-family:var(--ui);font-size:.82rem;color:var(--mid);}
.article-meta span{display:flex;align-items:center;gap:.3rem;}

/* ARTICLE BODY */
.article-body{padding:2rem 2.5rem 2.5rem;}
@media(max-width:600px){.article-body{padding:1.5rem;}}
.article-body h2{font-family:var(--font);font-size:1.45rem;font-weight:800;color:var(--dark);margin:2rem 0 .75rem;padding-top:1rem;border-top:2px solid var(--border);}
.article-body h2:first-child{border-top:none;padding-top:0;margin-top:0;}
.article-body h3{font-family:var(--font);font-size:1.1rem;font-weight:700;color:var(--accent);margin:1.4rem 0 .5rem;}
.article-body p{font-size:.97rem;line-height:1.88;color:#333;margin-bottom:1rem;}
.article-body ul,.article-body ol{padding-left:1.6rem;margin-bottom:1rem;}
.article-body li{font-size:.95rem;line-height:1.8;color:#333;margin-bottom:.3rem;}
.article-body strong{color:var(--dark);font-weight:700;}
.article-body a{color:var(--accent);text-decoration:underline;text-decoration-color:rgba(44,123,229,.3);}
.article-body a:hover{text-decoration-color:var(--accent);}

/* INLINE IMAGE BOXES */
.img-box{border-radius:12px;overflow:hidden;margin:1.75rem 0;box-shadow:0 4px 18px rgba(0,0,0,.1);}
.img-box-inner{width:100%;height:260px;display:flex;align-items:center;justify-content:center;position:relative;}
.img-caption{font-family:var(--ui);font-size:.78rem;color:var(--mid);text-align:center;padding:.6rem 1rem;background:#fafafa;border-top:1px solid var(--border);}

/* CALLOUT BOXES */
.callout{border-radius:10px;padding:1.1rem 1.4rem;margin:1.5rem 0;display:flex;gap:.85rem;align-items:flex-start;}
.callout-tip{background:#EBF3FF;border-left:4px solid var(--accent);}
.callout-star{background:#FFF8EC;border-left:4px solid var(--gold);}
.callout-check{background:#E9F9F1;border-left:4px solid var(--green);}
.callout-icon{font-size:1.3rem;flex-shrink:0;margin-top:.1rem;}
.callout-body{font-family:var(--ui);font-size:.91rem;line-height:1.7;color:#333;}
.callout-body strong{display:block;font-family:var(--font);font-weight:700;margin-bottom:.25rem;color:var(--dark);}

/* RESOURCE CARDS within article */
.resource-links{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.9rem;margin:1.5rem 0;}
.res-link{display:flex;align-items:center;gap:.7rem;background:var(--light);border:1.5px solid var(--border);border-radius:var(--radius);padding:.75rem 1rem;text-decoration:none;color:var(--dark);font-family:var(--font);font-size:.83rem;font-weight:600;transition:all .2s;}
.res-link:hover{border-color:var(--accent);background:#EBF3FF;color:var(--accent);text-decoration:none;}
.res-link-icon{font-size:1.3rem;flex-shrink:0;}

/* KEY TAKEAWAYS */
.takeaways{background:var(--dark);color:white;border-radius:12px;padding:1.5rem;margin:2rem 0;}
.takeaways h3{font-family:var(--font);font-weight:800;color:var(--gold);margin-bottom:.75rem;}
.takeaways ul{list-style:none;padding:0;display:flex;flex-direction:column;gap:.5rem;}
.takeaways li{font-family:var(--ui);font-size:.9rem;line-height:1.65;padding-left:1.4rem;position:relative;color:rgba(255,255,255,.88);}
.takeaways li::before{content:'✓';position:absolute;left:0;color:var(--gold);font-weight:700;}

/* SIDEBAR */
.sidebar{display:flex;flex-direction:column;gap:1.5rem;}
.sidebar-card{background:var(--white);border-radius:14px;box-shadow:var(--shadow);overflow:hidden;}
.sidebar-card-head{padding:.85rem 1.1rem;font-family:var(--font);font-weight:800;font-size:.88rem;color:white;background:var(--dark);}
.sidebar-card-body{padding:1rem 1.1rem;}
.sidebar-post{display:flex;gap:.75rem;align-items:flex-start;padding:.6rem 0;border-bottom:1px solid var(--border);text-decoration:none;color:var(--dark);}
.sidebar-post:last-child{border-bottom:none;}
.sidebar-post:hover .sidebar-post-title{color:var(--accent);}
.sidebar-post-thumb{width:52px;height:52px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;flex-shrink:0;}
.sidebar-post-title{font-family:var(--font);font-size:.78rem;font-weight:700;line-height:1.35;color:var(--dark);transition:color .2s;}
.sidebar-post-date{font-family:var(--ui);font-size:.7rem;color:var(--mid);margin-top:.2rem;}
.sidebar-tag{display:inline-block;font-family:var(--font);font-size:.72rem;font-weight:700;padding:.22rem .6rem;border-radius:999px;margin:.2rem;text-decoration:none;transition:all .2s;}
.sidebar-tag:hover{filter:brightness(.92);}

/* BLOG INDEX */
.blog-index-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;}
.blog-card{background:var(--white);border-radius:14px;box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;text-decoration:none;color:inherit;transition:transform .22s,box-shadow .22s;}
.blog-card:hover{transform:translateY(-5px);box-shadow:0 14px 36px rgba(0,0,0,.14);text-decoration:none;}
.blog-card-thumb{height:160px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;}
.blog-card-body{padding:1.1rem 1.25rem 1.4rem;flex:1;display:flex;flex-direction:column;gap:.4rem;}
.blog-card-tag{font-family:var(--font);font-size:.66rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;padding:.2rem .55rem;border-radius:4px;width:fit-content;}
.blog-card-title{font-family:var(--font);font-size:1rem;font-weight:800;line-height:1.3;color:var(--dark);}
.blog-card-excerpt{font-size:.83rem;color:var(--mid);line-height:1.6;flex:1;}
.blog-card-meta{font-family:var(--ui);font-size:.72rem;color:var(--mid);margin-top:.3rem;}

/* TABLE OF CONTENTS */
.toc{background:#f8f8ff;border:1.5px solid var(--border);border-radius:10px;padding:1.1rem 1.4rem;margin:1.5rem 0;}
.toc-title{font-family:var(--font);font-weight:800;font-size:.88rem;color:var(--dark);margin-bottom:.65rem;}
.toc ol{padding-left:1.25rem;margin:0;}
.toc li{font-family:var(--ui);font-size:.83rem;line-height:1.7;margin-bottom:.15rem;}
.toc a{color:var(--accent);text-decoration:none;}.toc a:hover{text-decoration:underline;}

/* SHARE ROW */
.share-row{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap;padding:1.25rem 0;border-top:1px solid var(--border);margin-top:2rem;}
.share-label{font-family:var(--font);font-size:.8rem;font-weight:700;color:var(--mid);}
.share-btn{display:inline-flex;align-items:center;gap:.35rem;font-family:var(--font);font-size:.78rem;font-weight:700;padding:.38rem .9rem;border-radius:999px;text-decoration:none;transition:filter .2s;}
.share-btn:hover{filter:brightness(.9);text-decoration:none;}