/* ===== CSS Variables ===== */
:root {
    --color-primary: #d4a574;
    --color-primary-dark: #b8894f;
    --color-primary-light: #e8c9a8;
    --color-background: #f8f9fa;
    --color-white: #ffffff;
    --color-text: #2c3e50;
    --color-text-light: #6c757d;
    --color-border: #dee2e6;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-shadow-hover: rgba(0, 0, 0, 0.12);

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    --border-radius: 12px;
    --border-radius-sm: 8px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    padding: var(--spacing-md);
}

/* ===== Container ===== */
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-md) 0;
}

/* ===== Header ===== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.6s ease;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--color-text-light);
    font-weight: 400;
}

/* ===== Cards ===== */
.calculator-card,
.results-card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 6px var(--color-shadow);
    transition: var(--transition);
    animation: fadeInUp 0.6s ease;
}

.calculator-card:hover {
    box-shadow: 0 8px 12px var(--color-shadow-hover);
}

.results-card {
    margin-top: var(--spacing-lg);
    text-align: center;
}

.results-card.hidden {
    display: none;
}

/* ===== Form Styles ===== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-text);
    font-size: 0.95rem;
}

.select {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    cursor: pointer;
    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='%236c757d' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 12px;
}

.select:hover {
    border-color: var(--color-primary-light);
}

.select:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: var(--color-white);
    box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.1);
}

.select option {
    padding: var(--spacing-sm);
}

/* ===== Buttons ===== */
.btn-calculate,
.btn-recalculate {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: inherit;
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    margin-top: var(--spacing-md);
    box-shadow: 0 4px 6px var(--color-shadow);
}

.btn-calculate:hover,
.btn-recalculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px var(--color-shadow-hover);
}

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

.btn-recalculate {
    background: var(--color-background);
    color: var(--color-text);
    box-shadow: none;
    border: 2px solid var(--color-border);
    margin-top: var(--spacing-lg);
}

.btn-recalculate:hover {
    background: var(--color-white);
    border-color: var(--color-primary);
    color: var(--color-primary-dark);
}

/* ===== Results Styles ===== */
.results-content {
    padding: var(--spacing-md) 0;
}

.results-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.results-amount {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-xs);
    margin: var(--spacing-lg) 0;
}

.amount-value {
    font-size: 4rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.amount-currency {
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-primary-dark);
}

.results-range {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--color-background);
    border-radius: var(--border-radius-sm);
    display: inline-block;
}

.results-explanation {
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1.8;
    max-width: 500px;
    margin: var(--spacing-md) auto;
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.footer p {
    margin-bottom: var(--spacing-xs);
}

.footer-note {
    font-size: 0.85rem;
    font-style: italic;
}

/* ===== Animations ===== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 640px) {
    body {
        padding: var(--spacing-sm);
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .calculator-card,
    .results-card {
        padding: var(--spacing-md);
    }

    .amount-value {
        font-size: 3rem;
    }

    .amount-currency {
        font-size: 1.5rem;
    }

    .select {
        font-size: 0.95rem;
        padding: 0.75rem;
    }
}

@media (max-width: 400px) {
    .title {
        font-size: 1.75rem;
    }

    .amount-value {
        font-size: 2.5rem;
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== Print Styles ===== */
@media print {
    body {
        background: white;
    }

    .calculator-card {
        display: none;
    }

    .btn-recalculate {
        display: none;
    }

    .footer {
        page-break-before: avoid;
    }
}