/* CSS Design Tokens for HELOC Calculator */
:root {
    /* Light Mode Palette */
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F1F5F9;
    --border-color: rgba(15, 23, 42, 0.08);
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    
    --accent: #0EA5E9; /* Sky Blue */
    --accent-rgb: 14, 165, 233;
    --accent-dark: #0284C7;
    
    --success: #10B981;
    --success-rgb: 16, 185, 129;
    
    --warning: #F59E0B;
    
    --card-shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.02);
    --font-headings: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html.dark {
    /* Dark Mode Palette */
    --bg-primary: #030712;
    --bg-secondary: #0B1329;
    --bg-tertiary: #111E38;
    --border-color: rgba(255, 255, 255, 0.06);
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --accent: #38BDF8;
    --accent-rgb: 56, 189, 248;
    --accent-dark: #0EA5E9;
    
    --card-shadow: 0 10px 35px -12px rgba(0, 0, 0, 0.5), 0 1px 3px rgba(0, 0, 0, 0.3);
}

/* Reset and Global Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

h1, h2, h3, h4 {
    font-family: var(--font-headings);
    color: var(--text-primary);
    font-weight: 700;
}

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

a:hover {
    color: var(--accent-dark);
}

button {
    font-family: var(--font-body);
}

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

/* Header Navbar Styles */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

html.dark header {
    background-color: rgba(11, 19, 41, 0.85);
}

html:not(.dark) header {
    background-color: rgba(255, 255, 255, 0.85);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.85rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.4rem 0.85rem;
    border-radius: 8px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}

.back-link:hover {
    color: var(--accent);
    background: var(--border-color);
    transform: translateX(-2px);
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-primary);
    font-family: var(--font-headings);
    font-weight: 800;
    font-size: 1.25rem;
}

.logo-icon {
    width: 28px;
    height: 28px;
    background-color: var(--accent);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
    font-family: var(--font-headings);
    font-weight: 800;
    font-size: 1.05rem;
    box-shadow: 0 2px 8px rgba(var(--accent-rgb), 0.3);
    transition: var(--transition);
}

.logo-link:hover .logo-icon {
    transform: rotate(-8deg) scale(1.05);
}

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

.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 38px;
    height: 38px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    background-color: var(--bg-tertiary);
}

.theme-toggle-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: scale(1.05);
}

.sun-icon { display: none; }
.moon-icon { display: block; width: 18px; height: 18px; }

html.dark .sun-icon { display: block; width: 18px; height: 18px; }
html.dark .moon-icon { display: none; }

/* Sub Navigation Bar / Calculator Tabs */
.sub-nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.5rem 1.5rem;
}

.sub-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
}

.nav-tab {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.6rem 1.2rem;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-tab:hover {
    color: var(--accent);
    background: var(--bg-tertiary);
}

.nav-tab.active {
    color: #FFFFFF;
    background: var(--accent);
    box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.25);
}

html.dark .nav-tab.active {
    color: #030712;
}

.hero-badge {
    background: rgba(var(--accent-rgb), 0.1);
    color: var(--accent);
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 700;
    border: 1px solid rgba(var(--accent-rgb), 0.2);
}

/* Hero Section */
.hero-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3.5rem 1.5rem 2rem 1.5rem;
    text-align: center;
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, #64748B 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

html.dark .hero-title {
    background: linear-gradient(135deg, #F8FAFC 0%, #94A3B8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Main Layout Grid */
.main-layout {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 1.5rem 4rem 1.5rem;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 2rem;
}

.full-width {
    grid-column: span 2;
}

/* Cards & Containers */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.25rem;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.card-title-container {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.card-title {
    font-size: 1.4rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Calculator Form Elements */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group.full-width {
    grid-column: span 2;
}

label {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-container {
    position: relative;
    display: flex;
    align-items: center;
}

.input-prefix, .input-suffix {
    position: absolute;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.95rem;
    pointer-events: none;
}

.input-prefix {
    left: 1rem;
}

.input-suffix {
    right: 1rem;
}

input[type="text"], input[type="number"], select {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
}

input[type="text"]:focus, input[type="number"]:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.15);
    background-color: var(--bg-secondary);
}

/* Adjust padding if prefix or suffix is present */
.has-prefix input {
    padding-left: 2rem;
}

.has-suffix input {
    padding-right: 2.2rem;
}

/* Slider styling */
.slider-group {
    margin-top: 0.5rem;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-top: 0.4rem;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 9999px;
    background: var(--bg-tertiary);
    outline: none;
    transition: var(--transition);
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(var(--accent-rgb), 0.4);
    border: 2px solid var(--bg-secondary);
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.25);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(var(--accent-rgb), 0.4);
    border: 2px solid var(--bg-secondary);
    transition: transform 0.1s;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.25);
}

/* Results Section Styling */
.results-card {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(var(--accent-rgb), 0.02) 100%);
    border: 1px solid var(--border-color);
}

.results-grid {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid var(--border-color);
}

.result-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.result-label {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.result-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.result-value.highlight {
    color: var(--accent);
    font-size: 1.35rem;
}

.result-value.success {
    color: var(--success);
}

/* Callouts / Warnings */
.alert-box {
    background-color: rgba(var(--accent-rgb), 0.06);
    border-left: 4px solid var(--accent);
    border-radius: 0 12px 12px 0;
    padding: 1rem 1.25rem;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.alert-box.warning {
    background-color: rgba(245, 158, 11, 0.06);
    border-left-color: var(--warning);
}

/* Timeline Visualization Bar */
.timeline-section {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
}

.timeline-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.timeline-bar-container {
    display: flex;
    height: 38px;
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}

.timeline-segment {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
    font-weight: 700;
    font-size: 0.8rem;
    transition: width 0.5s ease-in-out;
    position: relative;
    overflow: hidden;
}

html.dark .timeline-segment {
    color: #030712;
}

.timeline-segment.draw {
    background: linear-gradient(90deg, var(--accent) 0%, rgba(var(--accent-rgb), 0.8) 100%);
}

.timeline-segment.repay {
    background: linear-gradient(90deg, var(--success) 0%, rgba(var(--success-rgb), 0.8) 100%);
    color: #FFFFFF; /* Remain white for contrast on success green */
}

.timeline-labels-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 0.25rem;
}

.timeline-legend-item {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.legend-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-weight: 700;
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 4px;
}

.legend-color.draw {
    background-color: var(--accent);
}

.legend-color.repay {
    background-color: var(--success);
}

.legend-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Tab Switching Layouts */
.tab-content {
    display: none;
}

.tab-content.active {
    display: grid;
}

/* Tab 2 - Comparison Grid */
.comparison-layout {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.comparison-table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    background-color: var(--bg-secondary);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.comparison-table th, .comparison-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background-color: var(--bg-tertiary);
    font-weight: 700;
    color: var(--text-primary);
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table td:nth-child(2), .comparison-table td:nth-child(3) {
    font-weight: 600;
}

.comparison-table td:first-child {
    font-weight: 600;
    color: var(--text-secondary);
}

.loan-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-left: 0.4rem;
}

.loan-badge.variable {
    background-color: rgba(var(--accent-rgb), 0.1);
    color: var(--accent);
}

.loan-badge.fixed {
    background-color: rgba(var(--success-rgb), 0.1);
    color: var(--success);
}

/* Recommendation Box Styling */
.recommendation-box {
    background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.05) 0%, rgba(var(--success-rgb), 0.05) 100%);
    border: 2px dashed rgba(var(--accent-rgb), 0.25);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: var(--transition);
}

.recommendation-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-primary);
}

.recommendation-icon {
    font-size: 1.75rem;
}

.recommendation-text {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.recommendation-pill {
    background-color: var(--accent);
    color: #FFFFFF;
    padding: 0.35rem 0.85rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 700;
    display: inline-block;
    width: max-content;
}

html.dark .recommendation-pill {
    color: #030712;
}

/* Preference Toggles in Comparison Tab */
.preference-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.pref-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    cursor: pointer;
    background-color: var(--bg-primary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    user-select: none;
}

.pref-card:hover {
    border-color: var(--accent);
    background-color: rgba(var(--accent-rgb), 0.02);
}

.pref-card.selected {
    border-color: var(--accent);
    background-color: rgba(var(--accent-rgb), 0.08);
    box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.1);
}

.pref-checkbox {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    background-color: var(--bg-secondary);
}

.pref-card.selected .pref-checkbox {
    background-color: var(--accent);
    border-color: var(--accent);
}

.pref-checkbox::after {
    content: '✓';
    color: #FFFFFF;
    font-size: 0.7rem;
    font-weight: 800;
    display: none;
}

html.dark .pref-checkbox::after {
    color: #030712;
}

.pref-card.selected .pref-checkbox::after {
    display: block;
}

.pref-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.pref-card.selected .pref-label {
    color: var(--text-primary);
}

/* FAQ Accordion Styling */
.faq-section {
    max-width: 900px;
    margin: 4rem auto 0 auto;
    padding: 0 1.5rem;
}

.faq-title {
    text-align: center;
    font-size: 1.85rem;
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
}

.faq-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 16px;
    background-color: var(--bg-secondary);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--accent);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 1.25rem 1.5rem;
    text-align: left;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.faq-question-icon {
    font-size: 1.2rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.faq-item.active .faq-question-icon {
    transform: rotate(45deg);
    color: var(--accent);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
    padding: 0 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.faq-item.active .faq-answer {
    max-height: 1000px; /* arbitrary large value */
    padding-bottom: 1.5rem;
    transition: max-height 0.5s ease-in-out;
}

/* SEO Content Section */
.seo-content-card {
    max-width: 900px;
    margin: 4rem auto;
    padding: 3rem 2.5rem;
    line-height: 1.75;
}

.seo-content-card h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.seo-content-card h3 {
    font-size: 1.35rem;
    margin: 2rem 0 1rem 0;
    letter-spacing: -0.02em;
}

.seo-content-card p {
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

.seo-content-card ul, .seo-content-card ol {
    margin: 0 0 1.5rem 1.5rem;
    color: var(--text-secondary);
}

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

.seo-content-card strong {
    color: var(--text-primary);
}

/* Footer Section */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 1.5rem;
    margin-top: 4rem;
    transition: var(--transition);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    text-align: center;
}

.footer-brand {
    font-family: var(--font-headings);
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--text-primary);
}

.footer-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.footer-link {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.footer-link:hover {
    color: var(--accent);
}

.footer-copyright {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Tooltips */
.tooltip {
    position: relative;
    display: inline-flex;
    cursor: help;
    color: var(--text-muted);
    transition: var(--transition);
}

.tooltip:hover {
    color: var(--accent);
}

.tooltip-text {
    visibility: hidden;
    width: 220px;
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    text-align: center;
    border-radius: 8px;
    padding: 0.6rem 0.8rem;
    position: absolute;
    z-index: 10;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1.4;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    pointer-events: none;
}

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

/* Info Cards for SEO Page */
.info-highlight-box {
    background-color: var(--bg-tertiary);
    border-radius: 16px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
}

.info-highlight-box p:last-child {
    margin-bottom: 0;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    
    .full-width {
        grid-column: span 1;
    }
}

@media (max-width: 600px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .form-group.full-width {
        grid-column: span 1;
    }
    
    .preference-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline-labels-grid {
        grid-template-columns: 1fr;
    }
    
    .sub-nav-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .nav-tabs {
        width: 100%;
        overflow-x: auto;
    }
    
    .nav-tab {
        flex: 1;
        justify-content: center;
        white-space: nowrap;
    }
    
    .hero-badge {
        text-align: center;
        align-self: center;
    }
    
    .seo-content-card {
        padding: 2rem 1.25rem;
    }
}