:root{--primary:#4f46e5;--primary-dark:#4338ca;--text:#1f2430;--muted:#5b6472;--bg:#ffffff;--surface:#f6f7fb;--border:#e4e7ef;--radius:12px}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--text);background:var(--bg);line-height:1.6}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.site-header{border-bottom:1px solid var(--border);background:var(--bg);position:sticky;top:0;z-index:10}
.site-header nav{display:flex;align-items:center;gap:24px;height:64px}
.brand{font-weight:700;font-size:1.15rem;color:var(--text)}
.nav-links{display:flex;gap:18px;flex:1}
.nav-links a{color:var(--muted);font-size:.95rem}
.nav-cta{display:flex;gap:10px}
.btn{display:inline-block;padding:9px 18px;border-radius:8px;font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);text-decoration:none}
.btn-ghost{color:var(--text);border-color:var(--border)}
.btn-lg{padding:13px 26px;font-size:1.05rem}
.hero{text-align:center;padding:72px 20px 48px}
.hero h1{font-size:2.6rem;margin-bottom:14px}
.lead{font-size:1.15rem;color:var(--muted);max-width:640px;margin:0 auto 22px}
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;padding-bottom:64px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px}
.card h2{font-size:1.15rem;margin-bottom:8px}
.card p{color:var(--muted);font-size:.95rem}
.prose{padding:48px 20px;max-width:760px}
.prose h1{margin-bottom:12px}
.prose h2{margin:26px 0 8px;font-size:1.2rem}
.prose p{margin-bottom:12px}
.breadcrumbs{font-size:.85rem;color:var(--muted);margin-bottom:18px}
.auth-box{max-width:420px;padding:56px 20px}
.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px}
.auth-card h1{font-size:1.4rem;margin-bottom:18px}
.field{margin-bottom:14px}
.field label{display:block;font-size:.9rem;font-weight:600;margin-bottom:5px}
.field input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:1rem;background:var(--bg);color:var(--text)}
.field input:focus{outline:2px solid var(--primary);outline-offset:0;border-color:var(--primary)}
.form-msg{padding:10px 12px;border-radius:8px;margin-bottom:14px;font-size:.9rem;display:none}
.form-msg.error{display:block;background:#fdecec;color:#b42318}
.form-msg.ok{display:block;background:#e7f6ec;color:#12703c}
.auth-alt{margin-top:14px;font-size:.9rem;color:var(--muted);text-align:center}
.site-footer{border-top:1px solid var(--border);padding:26px 0;color:var(--muted);font-size:.9rem}
@media(max-width:720px){.nav-links{display:none}.hero h1{font-size:2rem}}