body {
    margin: 0; padding: 0; font-family: 'Segoe UI', sans-serif;
    height: 100vh; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), 
                url("{% static 'images/Plastic-Resin-Statistics-convertido-de-png.webp' %}") no-repeat center center fixed;
    background-size: cover;
}

/* Barra superior para idioma y regreso */
.top-utilities {
    position: absolute; top: 20px; right: 20px;
    display: flex; gap: 15px; z-index: 100; align-items: center;
}

.btn-utility, .lang-select {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px); color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 8px 15px; border-radius: 20px;
    text-decoration: none; font-size: 0.85rem; cursor: pointer;
    transition: all 0.3s;
}

.lang-select { outline: none; appearance: none; -webkit-appearance: none; text-align: center; }
.lang-select option { background: #1a365d; color: white; }

.btn-utility:hover, .lang-select:hover { background: white; color: #1a365d; }

/* Gateway Card */
.gateway-card {
    background: white; padding: 40px; border-radius: 8px;
    text-align: center; width: 100%; max-width: 400px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.4);
}
.logo-samkwang {
    font-size: 2.2rem; font-weight: 900; color: #1a365d;
    margin-bottom: 5px; text-transform: uppercase; letter-spacing: 3px;
}
.subtitle { color: #64748b; margin-bottom: 30px; font-size: 1rem; }

.btn-main {
    display: block; width: 100%; padding: 14px; margin-bottom: 12px;
    text-decoration: none; border-radius: 4px; font-weight: 600;
    transition: all 0.2s; border: 1px solid #e2e8f0; cursor: pointer;
    font-size: 1rem; box-sizing: border-box;
}
.btn-customer { background: #1e293b; color: white; border: none; }
.btn-employee { background: white; color: #1e293b; }
.btn-employee:hover { background: #f1f5f9; }

#employee-options { display: none; margin-top: 20px; border-top: 1px solid #eee; padding-top: 20px; }
#customer-options { display: none; margin-top: 20px; border-top: 1px solid #eee; padding-top: 20px; }

.btn-sub { background: #f8fafc; color: #334155; font-size: 0.9rem; border: 1px dashed #cbd5e1; }
.btn-sub:hover { background: #e2e8f0; border-style: solid; }

.back-link { display: inline-block; margin-top: 15px; color: #3b82f6; text-decoration: none; font-size: 0.85rem; }