* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Inter, sans-serif;
}

body {
    background: #f5f7fb;
    color: #0f172a;
}

/* LAYOUT */
.app {
    display: grid;
    grid-template-columns: 300px 1fr;
    height: 100vh;
}

/* SIDEBAR */
.sidebar {
    background: #0b1220;
    color: white;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sidebar h2 {
    font-size: 18px;
}

.sidebar h3 {
    font-size: 11px;
    opacity: 0.6;
    margin-top: 10px;
}

/* WORKSPACE */
.workspace {
    padding: 30px;
    overflow: auto;
}

/* INVOICE CARD */
.invoice-paper {
    background: white;
    max-width: 900px;
    margin: auto;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
}

/* HEADER */
.invoice-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
}

.logo {
    max-height: 60px;
    margin-bottom: 10px;
}

/* TABLE */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th {
    text-align: left;
    font-size: 11px;
    text-transform: uppercase;
    color: #64748b;
    padding: 12px;
}

td {
    padding: 12px;
    border-bottom: 1px solid #eef2f7;
}

/* TOTALS */
.totals {
    margin-top: 20px;
}

/* NOTES */
.notes {
    margin-top: 20px;
    color: #334155;
}

/* FOOTER */
footer {
    margin-top: 30px;
    font-size: 12px;
    color: #94a3b8;
}