/* ========================================
   MY QUICK TAX ESTIMATE - STYLES
   ========================================
   Ultra simple, modern CSS with mobile-first approach
   Uses CSS custom properties for easy theming
   ======================================== */

/* CSS Variables Theme */
:root {
    /* Colors */
    --color-primary: #4f46e5; /* Indigo */
    --color-primary-hover: #4338ca;
    --color-accent: #06b6d4; /* Cyan */
    --color-success: #10b981;
    --color-danger: #ef4444;
    --color-warning: #f59e0b;
    
    /* Neutral colors */
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    
    /* Typography */
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* ========================================
   BASE STYLES
   ======================================== */

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
}

/* ========================================
   HEADER
   ======================================== */

header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

header h1 {
    color: white;
    margin-bottom: 0;
}

.text-accent {
    color: var(--color-accent) !important;
}

/* ========================================
   CARDS
   ======================================== */

.card {
    border: none;
    border-radius: var(--radius-lg);
    background-color: var(--color-surface);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-body {
    padding: 1.5rem;
}

/* ========================================
   FORMS
   ======================================== */

.form-label {
    color: var(--color-text);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-control,
.form-select {
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.625rem 0.875rem;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-control.is-invalid {
    border-color: var(--color-danger);
}

.form-control.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.invalid-feedback {
    display: none;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

.form-text {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.2s ease;
    font-family: var(--font-body);
}

.btn-primary {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline-primary {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline-primary:hover,
.btn-outline-primary.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-check:checked + .btn-outline-primary {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

/* ========================================
   RESULTS SECTION
   ======================================== */

.result-card {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    text-align: center;
    transition: all 0.3s ease;
}

.result-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.result-card.refund {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
}

.result-card.owed {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
}

.result-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    font-family: var(--font-heading);
}

/* ========================================
   BREAKDOWN SECTION
   ======================================== */

.breakdown-section {
    background-color: #f8fafc;
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.625rem 0;
    font-size: 0.9rem;
}

.breakdown-item span {
    color: var(--color-text-muted);
}

.breakdown-item strong {
    color: var(--color-text);
    font-weight: 600;
}

.breakdown-item.highlight {
    background-color: #e0e7ff;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    margin: 0.5rem 0;
}

.breakdown-item.final-result {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    font-size: 1rem;
}

.breakdown-divider {
    border-top: 2px dashed var(--color-border);
    margin: 0.75rem 0;
}

.bracket-detail {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    padding: 0.375rem 0;
    padding-left: 1rem;
    border-left: 3px solid var(--color-accent);
    margin: 0.25rem 0;
}

/* ========================================
   ALERTS
   ======================================== */

.alert {
    border-radius: var(--radius-md);
    border: none;
    font-size: 0.9rem;
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
}

/* ========================================
   FOOTER
   ======================================== */

footer {
    background-color: var(--color-surface);
    margin-top: auto;
}

footer a {
    color: var(--color-text-muted);
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--color-primary);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Mobile-first: Base styles are for mobile */

/* Small devices and up (576px) */
@media (min-width: 576px) {
    .card-body {
        padding: 2rem;
    }
    
    .result-value {
        font-size: 2.25rem;
    }
}

/* Medium devices and up (768px) */
@media (min-width: 768px) {
    header {
        padding: 2rem 0 !important;
    }
    
    .result-value {
        font-size: 2.5rem;
    }
}

/* Large devices and up (992px) */
@media (min-width: 992px) {
    .card-body {
        padding: 2.5rem;
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

/* Focus states for keyboard navigation */
.form-control:focus,
.form-select:focus,
.btn:focus,
.btn-check:focus + .btn {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip to main content (for screen readers) */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .form-control,
    .form-select {
        border-width: 3px;
    }
}

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

/* ========================================
   UTILITY CLASSES
   ======================================== */

.text-success {
    color: var(--color-success) !important;
}

.text-danger {
    color: var(--color-danger) !important;
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
    header,
    footer,
    .btn,
    .alert {
        display: none;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    body {
        background-color: white;
    }
}