:root {
    --brand-blue: #2563eb;
    --brand-cyan: #06b6d4;
    --glass-bg: rgba(15, 23, 42, 0.85);
    --glass-border: rgba(255, 255, 255, 0.1);
}
.header-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
body {
    background: radial-gradient(at top center, #1e293b, #0f172a);
    font-family: 'Inter', sans-serif;
    color: #f1f5f9;
    margin: 0; padding: 40px 20px;
}

.main-wrapper { width: 100%; max-width: 680px; margin: 0 auto; }

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

h1 {
    font-family: 'Outfit', sans-serif; font-size: 2.2rem;
    background: linear-gradient(to right, #fff, #bfdbfe, #a5f3fc);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

.section-title {
    color: var(--brand-cyan); font-size: 0.85rem; text-transform: uppercase;
    border-bottom: 1px solid var(--glass-border); padding-bottom: 8px; margin: 30px 0 20px;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 500px) { .grid-2 { grid-template-columns: 1fr; } }

input, select {
    width: 100%; background: rgba(15, 23, 42, 0.6); border: 1px solid #475569;
    border-radius: 12px; padding: 12px; color: #fff; box-sizing: border-box;
}

.btn-calculate {
    width: 100%; padding: 22px; margin-top: 30px;
    background: linear-gradient(135deg, var(--brand-blue), var(--brand-cyan));
    border: none; border-radius: 16px; color: white; font-weight: 800;
    font-size: 1.2rem; text-transform: uppercase; cursor: pointer;
    box-shadow: 0 10px 25px -5px rgba(6, 182, 212, 0.4);
}

.total-tax {
    font-size: 3.5rem; font-weight: 800; text-align: center;
    background: linear-gradient(to right, #6ee7b7, #34d399);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.btn-print {
    padding: 12px 24px; background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border); border-radius: 12px; color: var(--brand-cyan);
    cursor: pointer; text-transform: uppercase; font-size: 0.8rem;
}

.hidden { display: none !important; }
.logo-img { height: 70px; border-radius: 12px; margin-bottom: 15px; }

@media print {
    .no-print, .main-card, .btn-calculate { display: none !important; }
    body { background: white !important; color: black !important; }
    .glass-panel { background: white !important; color: black !important; box-shadow: none !important; }
}