/* =========================================================================
   Finance Calculators Pack — Frontend Styles
   Glassmorphism + CSS Variables + Mobile First
   ========================================================================= */

:root {
    --fc-accent: #22d3ee;
    --fc-accent-glow: rgba(34, 211, 238, 0.15);
    --fc-bg: rgba(15, 20, 30, 0.85);
    --fc-bg-card: rgba(22, 28, 40, 0.7);
    --fc-bg-field: rgba(30, 38, 52, 0.8);
    --fc-text: #e2e8f0;
    --fc-text-muted: #8899aa;
    --fc-border: rgba(255, 255, 255, 0.08);
    --fc-radius: 10px;
    --fc-radius-sm: 6px;
    --fc-transition: 0.25s ease;
    --fc-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Wrapper */
.fc-calculator-wrapper {
    max-width: 800px;
    margin: 0 auto;
    font-family: var(--fc-font);
    color: var(--fc-text);
    background: var(--fc-bg);
    border: 1px solid var(--fc-border);
    border-radius: 16px;
    padding: 28px 24px 24px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.04);
}

.fc-calculator-header {
    margin-bottom: 24px;
    border-bottom: 1px solid var(--fc-border);
    padding-bottom: 14px;
}

.fc-calculator-title {
    font-size: 20px;
    font-weight: 600;
    margin: 0;
    color: var(--fc-text);
    letter-spacing: -0.01em;
}

/* Form */
.fc-form {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

@media (min-width: 600px) {
    .fc-form {
        grid-template-columns: 1fr 1fr;
    }
}

.fc-field {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.fc-field:has(.fc-checkbox-wrapper) {
    grid-column: 1 / -1;
}

.fc-field-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--fc-text-muted);
}

.fc-field-input {
    background: var(--fc-bg-field);
    border: 1px solid var(--fc-border);
    border-radius: var(--fc-radius-sm);
    color: var(--fc-text);
    padding: 10px 14px;
    font-size: 15px;
    font-family: var(--fc-font);
    transition: var(--fc-transition);
    outline: none;
}

.fc-field-input:focus {
    border-color: var(--fc-accent);
    box-shadow: 0 0 0 3px var(--fc-accent-glow);
}

.fc-field-input::placeholder {
    color: var(--fc-text-muted);
    opacity: 0.6;
}

.fc-input-select {
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238899aa' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 34px;
}

.fc-field-desc {
    font-size: 11px;
    color: var(--fc-text-muted);
    margin: 2px 0 0;
    line-height: 1.4;
}

/* Checkbox */
.fc-checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 0;
}

.fc-input-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--fc-accent);
    cursor: pointer;
}

.fc-checkbox-label {
    font-size: 14px;
    color: var(--fc-text);
}

/* Button */
.fc-calculate-btn {
    grid-column: 1 / -1;
    background: var(--fc-accent);
    color: #0c0f14;
    border: none;
    border-radius: var(--fc-radius-sm);
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    font-family: var(--fc-font);
    cursor: pointer;
    transition: var(--fc-transition);
    letter-spacing: 0.02em;
}

.fc-calculate-btn:hover {
    filter: brightness(1.15);
    box-shadow: 0 4px 20px var(--fc-accent-glow);
    transform: translateY(-1px);
}

.fc-calculate-btn:active {
    transform: translateY(0);
}

/* Results */
.fc-results {
    margin-top: 24px;
    animation: fcFadeSlideIn 0.4s ease;
}

@keyframes fcFadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fc-results-table {
    width: 100%;
    border-collapse: collapse;
}

.fc-results-table tr {
    border-bottom: 1px solid var(--fc-border);
}

.fc-results-table tr:last-child {
    border-bottom: none;
}

.fc-results-label {
    font-size: 14px;
    color: var(--fc-text-muted);
    padding: 10px 12px 10px 0;
    font-weight: 500;
}

.fc-results-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--fc-accent);
    text-align: right;
    padding: 10px 0;
    font-variant-numeric: tabular-nums;
}

.fc-results-section-header td {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--fc-text);
    padding: 14px 0 6px;
    border-bottom: 2px solid var(--fc-accent);
}

.fc-results-sub .fc-results-label {
    padding-left: 16px;
    font-size: 13px;
}

.fc-results-sub .fc-results-value {
    font-size: 14px;
}

/* Chart */
.fc-chart-container {
    margin-top: 24px;
    max-width: 100%;
}

.fc-chart-container canvas {
    max-height: 300px;
}

/* Loading */
.fc-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 24px;
    font-size: 14px;
    color: var(--fc-text-muted);
}

.fc-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--fc-border);
    border-top-color: var(--fc-accent);
    border-radius: 50%;
    animation: fcSpin 0.7s linear infinite;
}

@keyframes fcSpin {
    to { transform: rotate(360deg); }
}

/* Error */
.fc-error-box {
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.3);
    border-radius: var(--fc-radius-sm);
    padding: 12px 16px;
    margin-top: 16px;
    color: #f87171;
    font-size: 14px;
}

/* Amortization table */
.fc-amortization-table {
    width: 100%;
    font-size: 12px;
    margin-top: 16px;
}

.fc-amortization-table th {
    text-align: left;
    padding: 6px 8px;
    color: var(--fc-text-muted);
    font-weight: 600;
    font-size: 11px;
    text-transform: uppercase;
}

.fc-amortization-table td {
    padding: 6px 8px;
    border-bottom: 1px solid var(--fc-border);
    font-variant-numeric: tabular-nums;
}

/* Payment summary */
.fc-payment-summary {
    background: var(--fc-bg-card);
    border-radius: var(--fc-radius);
    padding: 20px;
    margin-top: 20px;
}

/* Responsive */
@media (max-width: 480px) {
    .fc-calculator-wrapper {
        padding: 18px 14px 16px;
        border-radius: 12px;
    }
    .fc-calculator-title {
        font-size: 17px;
    }
    .fc-field-input {
        padding: 8px 10px;
        font-size: 14px;
    }
    .fc-results-value {
        font-size: 14px;
    }
}