*{margin:0;padding:0;box-sizing:border-box}
:root{--blue:#0d4f67;--blue-light:#e0f5f9;--blue-dark:#082f3e;--teal:#1a8a9e;--text:#1a1a1a;--text-light:#555;--bg:#fff;--bg-alt:#f5fafb;--border:#d0e6eb;--max-width:720px;--nav-height:56px}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;line-height:1.75;color:var(--text);background:var(--bg)}
a{color:var(--teal);text-decoration:none}a:hover{text-decoration:underline}
nav{background:var(--blue-dark);color:#fff;padding:0 24px;height:var(--nav-height);display:flex;align-items:center;position:sticky;top:0;z-index:10}
nav a{color:#fff;font-weight:600;font-size:1.1rem}nav .nav-links{margin-left:auto;display:flex;gap:20px}nav .nav-links a{font-weight:400;font-size:.9rem;opacity:.85}nav .nav-links a:hover{opacity:1;text-decoration:none}
.container{max-width:var(--max-width);margin:0 auto;padding:32px 20px}
h1{font-size:2rem;line-height:1.25;margin-bottom:16px;color:var(--blue-dark)}
h2{font-size:1.4rem;line-height:1.3;margin:40px 0 12px;color:var(--blue-dark)}
h3{font-size:1.15rem;margin:28px 0 8px}
p{margin-bottom:16px}
ul,ol{margin:0 0 16px 24px}li{margin-bottom:6px}
.hero{background:linear-gradient(135deg,var(--blue-dark),var(--teal));color:#fff;padding:64px 24px;text-align:center}
.hero h1{color:#fff;font-size:2.4rem;margin-bottom:12px}
.hero p{color:rgba(255,255,255,.85);font-size:1.15rem;max-width:600px;margin:0 auto 24px}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;margin:32px 0}
.card{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:20px;transition:box-shadow .2s}
.card:hover{box-shadow:0 4px 12px rgba(0,0,0,.08)}
.card h3{margin:0 0 8px;font-size:1.05rem;color:var(--blue-dark)}
.card p{font-size:.9rem;color:var(--text-light);margin:0}
.tag{display:inline-block;background:var(--blue-light);color:var(--blue);font-size:.75rem;padding:2px 8px;border-radius:12px;margin-bottom:8px}
.breadcrumb{font-size:.85rem;color:var(--text-light);margin-bottom:24px}
.breadcrumb a{color:var(--text-light)}
.meta{font-size:.85rem;color:var(--text-light);margin-bottom:32px}
article img{max-width:100%;border-radius:8px;margin:16px 0}
.tool-container{background:var(--bg-alt);border:1px solid var(--border);border-radius:12px;padding:32px;margin:24px 0}
.tool-container label{display:block;font-size:.9rem;color:var(--text-light);margin-bottom:4px}
.tool-container input,.tool-container select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:6px;font-size:1rem;margin-bottom:16px}
.tool-container button{background:var(--teal);color:#fff;border:none;padding:12px 24px;border-radius:6px;font-size:1rem;cursor:pointer}
.tool-container button:hover{background:var(--blue)}
footer{background:var(--bg-alt);border-top:1px solid var(--border);padding:40px 24px;margin-top:64px;text-align:center;font-size:.85rem;color:var(--text-light)}
@media(max-width:600px){.hero{padding:40px 16px}.hero h1{font-size:1.8rem}h1{font-size:1.6rem}.card-grid{grid-template-columns:1fr}}