* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
body {
    background-color: #f8fafc;
    color: #334155;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.navbar {
    background-color: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    padding: 15px 0;
}
.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: #1e293b;
    text-decoration: none;
}
.logo-sub {
    color: #2563eb;
}
.nav-auth a {
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 6px;
}
.btn-panel {
    background-color: #1e293b;
    color: #ffffff;
}
.btn-panel:hover {
    background-color: #0f172a;
}
.site-intro {
    max-width: 1000px;
    margin: 50px auto 30px auto;
    padding: 0 20px;
    text-align: center;
}
.site-intro h1 {
    font-size: 2.2rem;
    color: #0f172a;
    font-weight: 700;
    margin-bottom: 10px;
}
.site-intro p {
    color: #64748b;
    font-size: 1.1rem;
}
.site-footer {
    background-color: #ffffff;
    border-top: 1px solid #e2e8f0;
    text-align: center;
    padding: 30px 20px;
    margin-top: 60px;
}
.footer-link {
    margin-bottom: 12px;
    font-size: 0.85rem;
}
.footer-link a {
    color: #64748b;
    text-decoration: none;
    font-weight: 500;
}
.footer-link a:hover {
    color: #1e293b;
    text-decoration: underline;
}
.footer-link .separator {
    color: #cbd5e1;
    margin: 0 10px;
}
.footer-copyright {
    font-size: 0.9rem;
    color: #475569;
}
@media (max-width: 768px) {
    .footer-link {
        display: flex;
        flex-direction: column;
        gap: 8px;
    }
    .footer-link .separator {
        display: none;
    }
}
.nav-user-controls { display: flex; align-items: center; gap: 15px; }
.nav-username-link { color: #0f172a; font-size: 0.95rem; font-weight: 600; text-decoration: none; transition: color 0.15s ease; }
.nav-username-link:hover { color: #2563eb; text-decoration: underline; }

.btn-icon-logout { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; background: #fee2e2; color: #ef4444; border-radius: 50%; text-decoration: none; transition: all 0.2s; }
.btn-icon-logout:hover { background: #fca5a5; color: #b91c1c; transform: translateY(-1px); }