body {
    background: #f8fafc;
    font-family: 'Poppins', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
}
.login-card {
    background: #fff;
    border-radius: 24px;
    box-shadow: 0 10px 40px -10px rgba(0,0,0,.05);
    max-width: 420px;
    width: 90%;
    padding: 3rem 2.5rem;
    text-align: center;
}
.logo-icon { font-size: 3.5rem; color: #10b981; }
h1 { font-size: 1.75rem; font-weight: 600; color: #1e293b; margin: 1rem 0 .5rem; }
.subtitle { color: #64748b; font-size: .95rem; margin-bottom: 2.5rem; }
.btn-oauth {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    border-radius: 14px;
    border: 1px solid #e2e8f0;
    background: #fff;
    color: #334155;
    text-decoration: none;
    font-weight: 500;
    font-size: .95rem;
    transition: all .2s ease;
}
.btn-oauth:hover {
    background: #f8fafc;
    border-color: #cbd5e1;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,.04);
}
.btn-oauth i { font-size: 1.4rem; margin-right: 1rem; width: 28px; text-align: center; }
.footer { margin-top: 2rem; font-size: .8rem; color: #cbd5e1; border-top: 1px solid #f1f5f9; padding-top: 1.5rem; }