/* AgeCalculator.bio — global styles */
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --primary-light:#dbeafe;
  --accent:#0ea5e9;
  --text:#1e293b;
  --text-light:#64748b;
  --bg:#f8fafc;
  --card:#ffffff;
  --border:#e2e8f0;
  --radius:12px;
  --shadow:0 1px 3px rgba(0,0,0,.08),0 4px 12px rgba(0,0,0,.05);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.7;font-size:17px}
.container{max-width:960px;margin:0 auto;padding:0 20px}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}

/* Header */
header{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:1.25rem;font-weight:800;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:8px}
.logo:hover{text-decoration:none}
.logo svg{flex-shrink:0}
.nav-links{display:flex;gap:24px;list-style:none;align-items:center}
.nav-links a{color:var(--text-light);font-weight:500;font-size:.95rem}
.nav-links a:hover{color:var(--primary);text-decoration:none}
.menu-btn{display:none;background:none;border:none;cursor:pointer;padding:8px}
@media(max-width:720px){
  .menu-btn{display:block}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:var(--card);flex-direction:column;padding:16px 20px;border-bottom:1px solid var(--border);gap:14px;align-items:flex-start;box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
}

/* Hero */
.hero{background:linear-gradient(135deg,#1e3a8a 0%,#2563eb 55%,#0ea5e9 100%);color:#fff;padding:48px 0 40px;text-align:center}
.hero h1{font-size:2.3rem;font-weight:800;margin-bottom:12px;letter-spacing:-.02em}
.hero p{font-size:1.1rem;opacity:.92;max-width:640px;margin:0 auto}
@media(max-width:600px){.hero h1{font-size:1.7rem}.hero{padding:36px 0 30px}}

/* Calculator card */
.calc-wrap{margin:-24px auto 40px;position:relative;z-index:5}
.calc-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px;border:1px solid var(--border)}
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:20px}
@media(max-width:600px){.calc-grid{grid-template-columns:1fr}}
.field label{display:block;font-weight:600;margin-bottom:6px;font-size:.95rem}
.field input[type=date],.field input[type=text],.field input[type=email],.field textarea,.field select{width:100%;padding:12px 14px;border:1.5px solid var(--border);border-radius:8px;font-size:1rem;font-family:inherit;background:#fff;color:var(--text)}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--primary)}
.hint{font-size:.85rem;color:var(--text-light);margin-top:4px}
.btn{display:inline-block;background:var(--primary);color:#fff;border:none;padding:14px 32px;font-size:1.05rem;font-weight:700;border-radius:8px;cursor:pointer;transition:background .15s;font-family:inherit}
.btn:hover{background:var(--primary-dark)}
.btn-row{text-align:center}

/* Results */
.result{display:none;margin-top:28px;border-top:1px solid var(--border);padding-top:24px}
.result.show{display:block}
.result-main{text-align:center;background:var(--primary-light);border-radius:var(--radius);padding:24px;margin-bottom:20px}
.result-main .big{font-size:2rem;font-weight:800;color:var(--primary-dark)}
.result-main .sub{color:var(--text-light);margin-top:4px}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.stat{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:14px;text-align:center}
.stat .num{font-size:1.25rem;font-weight:700;color:var(--primary)}
.stat .lbl{font-size:.82rem;color:var(--text-light)}
.next-bday{margin-top:16px;text-align:center;background:#fefce8;border:1px solid #fde68a;border-radius:8px;padding:14px;font-size:.98rem}
.err{display:none;color:#dc2626;text-align:center;margin-top:14px;font-weight:600}

/* Content sections */
.content{padding:8px 0 48px}
.content h2{font-size:1.6rem;margin:36px 0 14px;letter-spacing:-.01em}
.content h3{font-size:1.2rem;margin:26px 0 10px}
.content p{margin-bottom:16px;color:#334155}
.content ul,.content ol{margin:0 0 16px 24px;color:#334155}
.content li{margin-bottom:8px}
.content table{width:100%;border-collapse:collapse;margin:16px 0;background:var(--card);border-radius:8px;overflow:hidden;box-shadow:var(--shadow);font-size:.95rem}
.content th,.content td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border)}
.content th{background:var(--primary);color:#fff;font-weight:600}
.content tr:last-child td{border-bottom:none}
.example-box{background:#eff6ff;border-left:4px solid var(--primary);padding:16px 20px;border-radius:0 8px 8px 0;margin:16px 0}

/* FAQ */
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:8px;margin-bottom:10px;overflow:hidden}
.faq-item summary{padding:16px 20px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::after{content:"+";font-size:1.3rem;color:var(--primary);font-weight:400}
.faq-item[open] summary::after{content:"−"}
.faq-item summary::-webkit-details-marker{display:none}
.faq-body{padding:0 20px 16px;color:#334155}

/* Tool cards */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin:20px 0}
.tool-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:transform .15s}
.tool-card:hover{transform:translateY(-3px)}
.tool-card h3{margin:0 0 8px;font-size:1.1rem}
.tool-card p{font-size:.92rem;color:var(--text-light);margin:0}
.tool-card a{text-decoration:none}

/* Article */
.article-meta{color:var(--text-light);font-size:.9rem;margin-bottom:20px}
.breadcrumb{font-size:.88rem;color:var(--text-light);padding:16px 0 0}
.breadcrumb a{color:var(--text-light)}

/* Footer */
footer{background:#0f172a;color:#cbd5e1;padding:40px 0 24px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;margin-bottom:28px}
@media(max-width:640px){.footer-grid{grid-template-columns:1fr}}
footer h4{color:#fff;font-size:1rem;margin-bottom:12px}
footer ul{list-style:none}
footer li{margin-bottom:8px}
footer a{color:#94a3b8;font-size:.92rem}
footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid #1e293b;padding-top:20px;text-align:center;font-size:.85rem;color:#64748b}
.footer-desc{font-size:.92rem;color:#94a3b8;line-height:1.6}