:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-gray: #f8fafc;
    --border: #e2e8f0;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --green: #15803d;
    --red: #be123c;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f1f5f9;
    color: var(--text-main);
    display: flex;
    justify-content: center;
    padding: 20px;
    margin: 0;
}

.calculator-card {
    background: white;
    max-width: 650px;
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    overflow: hidden;
}

.header {
    background: var(--primary);
    color: white;
    padding: 24px;
}

.header h1 { margin: 0; font-size: 1.4rem; }
.header p { margin: 8px 0 0; font-size: 0.9rem; opacity: 0.9; }

.content { padding: 24px; }

.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
}

input, select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    box-sizing: border-box;
}

.button-group {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.file-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

button {
    cursor: pointer;
    font-weight: 600;
    padding: 12px;
    border-radius: 6px;
    border: none;
    transition: all 0.2s;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: #f1f5f9; color: var(--text-muted); }
.btn-secondary:hover { background: #e2e8f0; }

.results-area { margin-top: 32px; border-top: 2px solid var(--bg-gray); padding-top: 20px; }
.hidden { display: none; }

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 0.95rem;
}

.highlight { background: var(--bg-gray); padding: 10px; border-radius: 6px; font-weight: bold; margin: 10px 0; }
.text-red { color: var(--red); }
.text-green { color: var(--green); }
.border-top { border-top: 1px solid var(--border); padding-top: 10px; }

.final-box {
    text-align: center;
    border: 2px dashed var(--border);
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.final-box .amount { font-size: 2.2rem; font-weight: 800; margin: 4px 0; }
.final-box .label { font-size: 0.75rem; text-transform: uppercase; color: var(--text-muted); }

.bracket-reference { margin-top: 40px; }
.table-container { overflow-x: auto; border: 1px solid var(--border); border-radius: 6px; }
table { width: 100%; border-collapse: collapse; font-size: 0.8rem; }
th { text-align: left; background: var(--bg-gray); padding: 10px; }
td { padding: 10px; border-top: 1px solid var(--border); }

.disclaimer { font-size: 0.7rem; color: var(--text-muted); text-align: center; margin-top: 40px; }

@media print {
    .no-print { display: none !important; }
    body { background: white; padding: 0; }
    .calculator-card { box-shadow: none; max-width: 100%; }
    .results-area { display: block !important; }
}

@media (max-width: 500px) { .input-grid { grid-template-columns: 1fr; } }