main {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 1.5rem 4rem;
}

.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    margin-bottom: 1rem;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    text-decoration: none;
    color: var(--fg);
}
.brand img {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: #fff;
    padding: 3px;
}
.brand-name {
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
}
.nav-actions { display: flex; gap: 0.5rem; align-items: center; }
.nav-actions .btn { padding: 0.6rem 1.1rem; font-size: 0.9rem; }

.auth-shell {
    max-width: 420px;
    margin: 2.5rem auto 0;
}
.auth-shell h1 {
    font-size: clamp(1.85rem, 5vw, 2.25rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 0.4rem;
}
.auth-shell .greeting-sub {
    color: var(--muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    line-height: 1.5;
}

.field { margin-bottom: 1.1rem; }
label {
    display: block;
    font-size: 0.8rem;
    color: var(--muted);
    margin-bottom: 0.4rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
input[type="tel"], input[type="email"], input[type="password"] {
    width: 100%;
    padding: 0.95rem 1rem;
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--fg);
    font-size: 1rem;
    transition: border-color .12s ease, background .12s ease;
}
input:focus { outline: none; border-color: var(--accent); background: rgba(255,255,255,0.02); }
.err { color: #ff8c8c; font-size: 0.85rem; margin-top: 0.4rem; }

.submit { width: 100%; padding: 1rem; margin-top: 0.75rem; font-weight: 700; font-size: 1rem; }

.signup-card {
    margin-top: 2.5rem;
    padding: 1.5rem;
    background: linear-gradient(180deg, rgba(248,184,3,0.06), transparent);
    border: 1px solid var(--border);
    border-radius: 16px;
    text-align: center;
}
.signup-card .signup-q {
    font-size: 0.95rem;
    color: var(--muted);
    margin-bottom: 0.9rem;
}
.signup-card .btn {
    padding: 0.85rem 1.75rem;
    font-weight: 700;
    font-size: 0.95rem;
}