:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    --card-bg: rgba(255, 255, 255, 0.8);
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --success: #10b981;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

body {
    background: var(--bg-gradient);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    min-height: 100vh;
}

.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 1rem;
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 2rem;
}

.btn-premium {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-premium:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
    color: white;
}

.invoice-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 0.5rem;
}

.invoice-table th {
    color: var(--text-muted);
    font-weight: 500;
    padding: 1rem;
    text-align: left;
}

.invoice-table td {
    background: white;
    padding: 1rem;
}

.invoice-table tr td:first-child { border-radius: 0.5rem 0 0 0.5rem; }
.invoice-table tr td:last-child { border-radius: 0 0.5rem 0.5rem 0; }

@media (max-width: 768px) {
    .glass-card { padding: 1rem; }
    .invoice-table thead { display: none; }
    .invoice-table tr { display: block; margin-bottom: 1rem; box-shadow: var(--shadow); border-radius: 0.5rem; }
    .invoice-table td { display: block; text-align: right; padding-left: 50%; position: relative; border: none !important; }
    .invoice-table td::before {
        content: attr(data-label);
        position: absolute;
        left: 1rem;
        width: 45%;
        text-align: left;
        font-weight: bold;
        color: var(--text-muted);
    }
}

.form-premium input, .form-premium select, .form-premium textarea {
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem;
    width: 100%;
    transition: border-color 0.2s;
}

.form-premium input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}