/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --c-bg:#f8f9fa;
  --c-surface:#ffffff;
  --c-primary:#1a73e8;
  --c-primary-dark:#1557b0;
  --c-accent:#00c896;
  --c-text:#1e293b;
  --c-text-light:#64748b;
  --c-border:#e2e8f0;
  --font-body:'Inter',system-ui,-apple-system,sans-serif;
  --font-heading:'Inter',system-ui,-apple-system,sans-serif;
  --max-w:1140px;
  --radius:12px;
  --shadow:0 1px 3px rgba(0,0,0,.08),0 4px 12px rgba(0,0,0,.04);
  --shadow-lg:0 4px 24px rgba(0,0,0,.1);
  --transition:all .25s ease;
}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:var(--font-body);color:var(--c-text);background:var(--c-bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--c-primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--c-primary-dark)}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{font-family:var(--font-heading);line-height:1.25;font-weight:700}
ul,ol{padding-left:1.5em}

/* ===== UTILITY ===== */
.container{max-width:var(--max-w);margin:0 auto;padding:0 1.25rem}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* ===== HEADER / NAV ===== */
.site-header{
  background:var(--c-surface);
  border-bottom:1px solid var(--c-border);
  position:sticky;top:0;z-index:100;
  backdrop-filter:blur(12px);
  background:rgba(255,255,255,.92);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;
}
.logo{font-size:1.35rem;font-weight:800;color:var(--c-text);display:flex;align-items:center;gap:.5rem}
.logo span.dot{color:var(--c-primary)}
.logo img{height:32px;width:32px}

/* Desktop nav */
.main-nav ul{list-style:none;display:flex;gap:.25rem;padding:0}
.main-nav a{
  padding:.5rem .85rem;border-radius:8px;font-size:.9rem;font-weight:500;
  color:var(--c-text-light);transition:var(--transition);
}
.main-nav a:hover,.main-nav a.active{background:var(--c-primary);color:#fff}

/* Hamburger */
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:.5rem}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--c-text);margin:5px 0;transition:var(--transition);border-radius:2px}

@media(max-width:768px){
  .nav-toggle{display:block}
  .main-nav{
    position:fixed;top:64px;left:0;right:0;bottom:0;
    background:var(--c-surface);
    transform:translateX(100%);transition:transform .3s ease;
    padding:1.5rem;z-index:99;
  }
  .main-nav.open{transform:translateX(0)}
  .main-nav ul{flex-direction:column;gap:.5rem}
  .main-nav a{font-size:1.1rem;padding:.75rem 1rem;display:block}
  .nav-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
  .nav-toggle.active span:nth-child(2){opacity:0}
  .nav-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
}

/* ===== HERO ===== */
.hero{
  padding:4rem 0 3rem;
  text-align:center;
  background:linear-gradient(135deg,#eef2ff 0%,#e0f2fe 50%,#ecfdf5 100%);
}
.hero h1{font-size:clamp(2rem,5vw,3rem);margin-bottom:1rem;color:var(--c-text)}
.hero .lead{font-size:clamp(1rem,2.5vw,1.25rem);color:var(--c-text-light);max-width:640px;margin:0 auto 2rem}
.hero-badges{display:flex;flex-wrap:wrap;justify-content:center;gap:.5rem;margin-bottom:2rem}
.badge{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.35rem .85rem;border-radius:99px;font-size:.8rem;font-weight:600;
  background:var(--c-surface);border:1px solid var(--c-border);color:var(--c-text-light);
}
.badge svg{width:14px;height:14px}

/* ===== CARD GRID ===== */
.section{padding:4rem 0}
.section-title{font-size:1.75rem;text-align:center;margin-bottom:.5rem}
.section-subtitle{text-align:center;color:var(--c-text-light);margin-bottom:2.5rem;font-size:1.05rem}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}

.card{
  background:var(--c-surface);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:var(--transition);
  display:flex;flex-direction:column;
}
.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.card-thumb{
  width:100%;aspect-ratio:16/9;object-fit:cover;
  background:linear-gradient(135deg,#dbeafe,#c7d2fe);
}
.card-body{padding:1.25rem 1.25rem 1.5rem;flex:1;display:flex;flex-direction:column}
.card-category{
  font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;
  color:var(--c-primary);margin-bottom:.5rem;
}
.card-body h3{font-size:1.15rem;margin-bottom:.5rem}
.card-body p{color:var(--c-text-light);font-size:.92rem;flex:1}
.card-meta{
  display:flex;align-items:center;gap:.75rem;margin-top:1rem;
  font-size:.78rem;color:var(--c-text-light);
}
.read-more{
  display:inline-flex;align-items:center;gap:.3rem;
  font-weight:600;font-size:.88rem;margin-top:.75rem;color:var(--c-primary);
}
.read-more:hover{gap:.55rem}

/* ===== ARTICLE PAGE ===== */
.article-hero{
  padding:3.5rem 0 2rem;
  background:linear-gradient(135deg,#eef2ff 0%,#e0f2fe 100%);
}
.article-hero .container{max-width:780px}
.article-hero .badge{margin-bottom:1rem}
.article-hero h1{font-size:clamp(1.75rem,4vw,2.5rem);margin-bottom:1rem}
.article-hero .lead{font-size:1.05rem;color:var(--c-text-light)}
.article-meta{display:flex;flex-wrap:wrap;gap:1rem;margin-top:1.25rem;font-size:.85rem;color:var(--c-text-light)}

.article-content{
  max-width:780px;margin:0 auto;padding:2.5rem 1.25rem 4rem;
}
.article-content h2{font-size:1.5rem;margin:2.5rem 0 1rem;color:var(--c-text)}
.article-content h3{font-size:1.2rem;margin:2rem 0 .75rem}
.article-content p{margin-bottom:1.25rem}
.article-content ul,.article-content ol{margin-bottom:1.25rem}
.article-content li{margin-bottom:.4rem}
.article-content blockquote{
  border-left:4px solid var(--c-primary);padding:1rem 1.25rem;margin:1.5rem 0;
  background:#f0f4ff;border-radius:0 var(--radius) var(--radius) 0;
  font-style:italic;color:var(--c-text-light);
}
.article-content .info-box{
  background:linear-gradient(135deg,#ecfdf5,#d1fae5);
  border:1px solid #a7f3d0;border-radius:var(--radius);
  padding:1.25rem 1.5rem;margin:1.5rem 0;
}
.article-content .info-box h4{color:#065f46;margin-bottom:.5rem}
.article-content .info-box p{color:#064e3b;margin-bottom:0}
.article-content .tip-box{
  background:linear-gradient(135deg,#eff6ff,#dbeafe);
  border:1px solid #93c5fd;border-radius:var(--radius);
  padding:1.25rem 1.5rem;margin:1.5rem 0;
}
.article-content .tip-box h4{color:#1e40af;margin-bottom:.5rem}
.article-content .tip-box p{color:#1e3a5f;margin-bottom:0}

.article-featured-img{
  width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--radius);
  margin-bottom:2rem;
  background:linear-gradient(135deg,#dbeafe,#c7d2fe);
}

/* ===== TABLE OF CONTENTS ===== */
.toc{
  background:var(--c-surface);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:1.25rem 1.5rem;margin-bottom:2rem;
}
.toc h4{font-size:.9rem;text-transform:uppercase;letter-spacing:.05em;color:var(--c-text-light);margin-bottom:.75rem}
.toc ol{list-style:decimal;padding-left:1.25rem}
.toc li{margin-bottom:.35rem}
.toc a{font-size:.92rem;font-weight:500}

/* ===== NEWSLETTER ===== */
.newsletter{
  background:linear-gradient(135deg,#1e293b,#334155);
  color:#fff;padding:3.5rem 0;text-align:center;
}
.newsletter h2{color:#fff;margin-bottom:.5rem;font-size:1.5rem}
.newsletter p{color:#94a3b8;margin-bottom:1.5rem}
.newsletter-form{display:flex;gap:.5rem;max-width:440px;margin:0 auto;flex-wrap:wrap;justify-content:center}
.newsletter-form input{
  flex:1;min-width:220px;padding:.7rem 1rem;border-radius:8px;border:none;
  font-size:.95rem;outline:none;
}
.newsletter-form button{
  padding:.7rem 1.5rem;border-radius:8px;border:none;
  background:var(--c-primary);color:#fff;font-weight:600;font-size:.95rem;
  cursor:pointer;transition:var(--transition);
}
.newsletter-form button:hover{background:var(--c-primary-dark)}

/* ===== FOOTER ===== */
.site-footer{
  background:var(--c-surface);border-top:1px solid var(--c-border);
  padding:3rem 0 1.5rem;font-size:.88rem;color:var(--c-text-light);
}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:2rem;margin-bottom:2rem}
.footer-col h4{font-size:.85rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--c-text);margin-bottom:.75rem}
.footer-col ul{list-style:none;padding:0}
.footer-col li{margin-bottom:.4rem}
.footer-col a{color:var(--c-text-light)}
.footer-col a:hover{color:var(--c-primary)}
.footer-bottom{text-align:center;padding-top:1.5rem;border-top:1px solid var(--c-border);font-size:.82rem}

/* ===== BREADCRUMB ===== */
.breadcrumb{font-size:.82rem;color:var(--c-text-light);margin-bottom:1rem}
.breadcrumb a{color:var(--c-text-light)}
.breadcrumb a:hover{color:var(--c-primary)}
.breadcrumb span{margin:0 .35rem}

/* ===== SCROLL-TO-TOP ===== */
.scroll-top{
  position:fixed;bottom:2rem;right:2rem;
  width:44px;height:44px;border-radius:50%;
  background:var(--c-primary);color:#fff;border:none;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;opacity:0;visibility:hidden;
  transition:var(--transition);box-shadow:var(--shadow-lg);z-index:50;
}
.scroll-top.visible{opacity:1;visibility:visible}
.scroll-top:hover{background:var(--c-primary-dark);transform:scale(1.1)}

/* ===== ANIMATIONS ===== */
.fade-in{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* ===== PRINT ===== */
@media print{
  .site-header,.site-footer,.newsletter,.scroll-top,.nav-toggle{display:none}
  body{font-size:12pt;color:#000}
  .article-content{max-width:100%;padding:0}
}