/* Shared design for SmartVocab public pages: /, /about, /features,
   /english-vocabulary, /blog and blog articles. Lightweight, no JS. */
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:#f7f9fc;color:#1f2937;line-height:1.6}
a{color:#2563eb}
a:hover{color:#1d4ed8}
.sv-container{max-width:1100px;margin:0 auto;padding:0 1rem}

/* nav */
.sv-nav{background:#fff;border-bottom:1px solid #e5e7eb}
.sv-nav .sv-container{display:flex;align-items:center;gap:1rem;min-height:58px;flex-wrap:wrap;padding-top:.5rem;padding-bottom:.5rem}
.sv-brand{font-size:1.25rem;font-weight:700;color:#1f2937;text-decoration:none;line-height:1.2}
.sv-brand span{color:#3b82f6}
.sv-links{display:flex;align-items:center;gap:1.1rem;flex-wrap:wrap}
.sv-links a{color:#374151;text-decoration:none;font-size:.95rem;font-weight:500}
.sv-links a:hover{color:#2563eb}
.sv-actions{margin-left:auto;display:flex;align-items:center;gap:.6rem;flex-wrap:wrap}
.sv-btn{display:inline-block;border-radius:999px;padding:.45rem 1.1rem;font-size:.9rem;font-weight:600;text-decoration:none}
.sv-btn-outline{border:1px solid #d1d5db;background:#fff;color:#374151}
.sv-btn-outline:hover{border-color:#9ca3af;color:#1f2937}
.sv-btn-solid{background:#3b82f6;border:1px solid #3b82f6;color:#fff}
.sv-btn-solid:hover{background:#2563eb;color:#fff}
.sv-btn-cta{border-radius:999px;padding:.7rem 1.8rem;font-weight:600;display:inline-block;text-decoration:none}
.sv-btn-cta-primary{background:#3b82f6;border:1px solid #3b82f6;color:#fff}
.sv-btn-cta-primary:hover{background:#2563eb;color:#fff}
.sv-btn-cta-ghost{border:1px solid #d1d5db;background:#fff;color:#374151}
.sv-btn-cta-ghost:hover{border-color:#9ca3af;color:#1f2937}
.lang-toggle{display:inline-block;padding:.3rem .7rem;border-radius:.5rem;font-size:.85rem;font-weight:600;text-decoration:none;border:1px solid #d1d5db;color:#374151}
.lang-toggle:hover{border-color:#9ca3af;color:#1f2937}

/* hero */
.sv-hero{background:linear-gradient(180deg,#eef4ff 0%,#f7f9fc 100%);padding:4.5rem 1rem 4rem;text-align:center}
.sv-hero h1{font-size:2.5rem;font-weight:800;letter-spacing:-.02em;margin:0 0 1rem;line-height:1.15}
.sv-hero .sv-lead{font-size:1.15rem;color:#4b5563;max-width:680px;margin:0 auto 1.6rem}
.sv-actions-row{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap;margin-bottom:1rem}

/* sections */
.sv-section{padding:3.5rem 1rem}
.sv-section-alt{background:#fff;border-top:1px solid #e5e7eb;border-bottom:1px solid #e5e7eb}
.sv-section h2{font-size:1.8rem;font-weight:700;margin:0 0 1rem;line-height:1.25}
.sv-section .sv-sub{color:#6b7280;margin:0 0 2.5rem}
.sv-section-centered h2{text-align:center}
.sv-section-centered .sv-sub{text-align:center}

/* cards */
.sv-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.2rem}
.sv-card{background:#fff;border:1px solid #e5e7eb;border-radius:1rem;padding:1.5rem;box-shadow:0 1px 2px rgba(16,24,40,.04)}
.sv-card-icon{width:44px;height:44px;border-radius:.75rem;background:#eef4ff;color:#3b82f6;display:flex;align-items:center;justify-content:center;font-size:1.3rem;margin-bottom:.9rem}
.sv-card h3{font-size:1.05rem;font-weight:700;margin:0 0 .4rem}
.sv-card p{color:#6b7280;font-size:.95rem;margin:0}

/* prose: long-form content (english-vocabulary, articles) */
.sv-prose{max-width:760px}
.sv-prose h2{font-size:1.55rem;font-weight:700;margin:2.2rem 0 .9rem;line-height:1.3}
.sv-prose h3{font-size:1.2rem;font-weight:700;margin:1.8rem 0 .7rem}
.sv-prose p{margin:0 0 1.1rem}
.sv-prose ul{margin:0 0 1.1rem;padding-left:1.3rem}
.sv-prose li{margin-bottom:.4rem}
.sv-prose blockquote{border-left:4px solid #93c5fd;margin:1.2rem 0;padding:.4rem 1rem;color:#4b5563;background:#f0f6ff;border-radius:0 .5rem .5rem 0}

/* blog cards */
.sv-blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.2rem}
.sv-blog-card{background:#fff;border:1px solid #e5e7eb;border-radius:1rem;padding:1.4rem;box-shadow:0 1px 2px rgba(16,24,40,.04);display:flex;flex-direction:column;text-decoration:none;color:inherit}
.sv-blog-card:hover{border-color:#93c5fd;box-shadow:0 4px 12px rgba(59,130,246,.12)}
.sv-blog-card h3{font-size:1.15rem;font-weight:700;margin:0 0 .5rem;color:#1f2937}
.sv-blog-card p{color:#6b7280;font-size:.95rem;margin:0 0 1rem;flex:1}
.sv-blog-meta{font-size:.85rem;color:#9ca3af;font-weight:500}
.sv-badge{display:inline-block;background:#eef4ff;color:#2563eb;font-size:.75rem;font-weight:700;padding:.15rem .6rem;border-radius:999px;margin-bottom:.7rem}

/* breadcrumb */
.sv-breadcrumb{font-size:.88rem;color:#6b7280;padding:1.1rem 0 0}
.sv-breadcrumb a{color:#6b7280;text-decoration:none}
.sv-breadcrumb a:hover{color:#2563eb}

/* CTA band */
.sv-cta{background:linear-gradient(135deg,#2563eb,#3b82f6);color:#fff;padding:3.5rem 1rem;text-align:center}
.sv-cta h2{font-size:1.7rem;font-weight:700;margin:0 0 .6rem;color:#fff}
.sv-cta p{opacity:.92;margin:0 0 1.5rem}
.sv-cta .sv-btn-cta-primary{background:#fff;border-color:#fff;color:#2563eb}
.sv-cta .sv-btn-cta-primary:hover{background:#f0f6ff}

/* footer */
.sv-footer{background:#fff;border-top:1px solid #e5e7eb;padding:2.5rem 1rem 1.5rem}
.sv-footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:2rem;max-width:1100px;margin:0 auto}
.sv-footer-col h4{font-size:.85rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:#6b7280;margin:0 0 .8rem}
.sv-footer-col a{display:block;color:#374151;text-decoration:none;font-size:.95rem;margin-bottom:.45rem}
.sv-footer-col a:hover{color:#2563eb}
.sv-footer-col p{color:#6b7280;font-size:.95rem;margin:.6rem 0 0}
.sv-copy{text-align:center;color:#9ca3af;font-size:.88rem;margin:2rem 0 0}

@media (max-width:640px){
  .sv-hero h1{font-size:2rem}
  .sv-actions{margin-left:0}
  .sv-nav .sv-container{gap:.6rem}
}