/* ============================================
   MORTGAGE CALCULATOR WEBSITE - MAIN STYLES
   Optimized for AdSense & SEO
   ============================================ */

/* ===== CSS VARIABLES ===== */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #2980b9;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --light-bg: #ecf0f1;
    --white: #ffffff;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #bdc3c7;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 1rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.site-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--white);
    margin: 0;
}

.site-tagline {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 0.25rem;
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--white);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
    background-color: rgba(255, 255, 255, 0.2);
    text-decoration: none;
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    background: none;
    border: 2px solid var(--white);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
}

/* ===== MAIN CONTAINER ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

/* ===== LAYOUT GRID ===== */
.layout-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
    margin-top: 2rem;
}

.main-content {
    min-width: 0; /* Prevent grid blowout */
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* ===== CARD COMPONENT ===== */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    margin-bottom: 2rem;
}

.card:hover {
    box-shadow: var(--shadow-hover);
}

.card-header {
    border-bottom: 2px solid var(--light-bg);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.card-title {
    margin: 0;
    color: var(--primary-color);
}

.card-subtitle {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

/* ===== FORM STYLES ===== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.form-label .tooltip {
    display: inline-block;
    width: 18px;
    height: 18px;
    background: var(--secondary-color);
    color: var(--white);
    border-radius: 50%;
    text-align: center;
    line-height: 18px;
    font-size: 0.75rem;
    margin-left: 0.25rem;
    cursor: help;
    position: relative;
}

.tooltip-text {
    visibility: hidden;
    width: 250px;
    background-color: var(--primary-color);
    color: var(--white);
    text-align: left;
    border-radius: var(--border-radius);
    padding: 0.75rem;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -125px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.85rem;
    font-weight: normal;
    line-height: 1.4;
    box-shadow: var(--shadow);
}

.tooltip-text::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--primary-color) transparent transparent transparent;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-input[type="range"] {
    padding: 0;
    height: 6px;
    background: var(--border-color);
    border: none;
    border-radius: 3px;
}

.form-input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--secondary-color);
    cursor: pointer;
    border-radius: 50%;
    box-shadow: var(--shadow);
}

.form-input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--secondary-color);
    cursor: pointer;
    border-radius: 50%;
    border: none;
    box-shadow: var(--shadow);
}

.input-group {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
}

.input-group .form-group {
    flex: 1;
    margin-bottom: 0;
}

.input-with-slider {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    align-items: center;
}

.range-value {
    text-align: center;
    font-weight: 600;
    color: var(--secondary-color);
    font-size: 1.1rem;
}

/* ===== BUTTON STYLES ===== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    text-decoration: none;
}

.btn-secondary {
    background: var(--light-bg);
    color: var(--text-dark);
}

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

.btn-success {
    background: var(--success-color);
    color: var(--white);
}

.btn-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.btn-block {
    width: 100%;
}

/* ===== RESULTS SECTION ===== */
.results-section {
    display: none;
    animation: fadeIn 0.5s ease-in;
}

.results-section.show {
    display: block;
}

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

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.result-item {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    color: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
}

.result-label {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 1.75rem;
    font-weight: 700;
}

.breakdown-list {
    list-style: none;
    background: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.breakdown-list li {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.breakdown-list li:last-child {
    border-bottom: none;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--secondary-color);
}

/* ===== TABLE STYLES ===== */
.table-container {
    overflow-x: auto;
    margin: 2rem 0;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.data-table thead {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
}

.data-table th,
.data-table td {
    padding: 1rem;
    text-align: left;
}

.data-table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.data-table tbody tr {
    border-bottom: 1px solid var(--light-bg);
    transition: var(--transition);
}

.data-table tbody tr:hover {
    background-color: var(--light-bg);
}

.data-table tbody tr:last-child {
    border-bottom: none;
}

.data-table td {
    font-size: 0.95rem;
}

/* ===== CHART CONTAINER ===== */
.chart-container {
    position: relative;
    height: 400px;
    margin: 2rem 0;
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

/* ===== ADSENSE PLACEHOLDERS ===== */
.ad-container {
    background: var(--light-bg);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    text-align: center;
    margin: 2rem 0;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

.ad-leaderboard {
    min-height: 90px;
}

.ad-rectangle {
    min-height: 250px;
}

.ad-sidebar .ad-container {
    margin: 0;
}

/* ===== EDUCATIONAL CONTENT ===== */
.content-section {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin: 2rem 0;
}

.content-section h2 {
    color: var(--primary-color);
    border-bottom: 3px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.content-section h3 {
    color: var(--secondary-color);
    margin-top: 1.5rem;
}

.content-section ul,
.content-section ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content-section li {
    margin-bottom: 0.5rem;
}

/* ===== FAQ SECTION ===== */
.faq-item {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.faq-question {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.faq-answer {
    color: var(--text-dark);
    line-height: 1.7;
}

/* ===== RELATED CALCULATORS ===== */
.related-calculators {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.calculator-link {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.calculator-link:hover {
    border-color: var(--secondary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    text-decoration: none;
}

.calculator-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.calculator-name {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.calculator-description {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h3 {
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
}

.footer-section a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

/* ===== ALERTS & MESSAGES ===== */
.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert-success {
    background: #d4edda;
    border-color: var(--success-color);
    color: #155724;
}

.alert-warning {
    background: #fff3cd;
    border-color: var(--warning-color);
    color: #856404;
}

.alert-error {
    background: #f8d7da;
    border-color: var(--danger-color);
    color: #721c24;
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-light); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.hidden { display: none; }

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 992px) {
    .layout-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        order: -1;
    }
    
    .results-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .menu-toggle {
        display: block;
        align-self: flex-end;
        margin-top: -2rem;
    }
    
    .main-nav {
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .main-nav.active {
        max-height: 500px;
        margin-top: 1rem;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav li {
        width: 100%;
    }
    
    .main-nav a {
        display: block;
        padding: 0.75rem;
    }
    
    .container {
        padding: 1rem;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.35rem; }
    
    .input-with-slider {
        grid-template-columns: 1fr;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .chart-container {
        height: 300px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .result-value {
        font-size: 1.5rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.5rem;
        font-size: 0.85rem;
    }
    
    .related-calculators {
        grid-template-columns: 1fr;
    }
}

/* ===== ACCESSIBILITY ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
select:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000000;
        --secondary-color: #0000ff;
        --border-color: #000000;
    }
}

/* 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;
        scroll-behavior: auto !important;
    }
}