/**
 * FINDENSITY.COM — MAIN APP STYLESHEET
 * Step 2 Deliverable — CSS Design System, Headers & Footers
 * Compiled conforming to target United States SEO guidelines
 */

/* 1. CSS VARIABLES (DESIGN SYSTEM) */
:root {
    /* Color Palette */
    --color-primary: #0A1628;      /* Deep Navy */
    --color-surface: #FFFFFF;      /* White Cards */
    --bg-page: #F4F6F9;            /* Page Background */
    --color-accent: #F5A623;       /* Gold Accent & CTA */
    --color-accent-hover: #E0951D; /* Hover Gold shadow */
    --text-primary: #0A1628;       /* Primary Text */
    --text-secondary: #5A6478;     /* Secondary Text */
    --border-color: #E2E8F0;       /* Border Slate-100 */
    --color-success: #16A34A;      /* Emerald-600 */
    --color-error: #DC2626;        /* Red-600 */
    
    /* Spacing Scale */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;
    --space-8: 64px;

    /* Border Radii */
    --radius-card: 8px;
    --radius-input: 4px;
    --radius-button: 24px;

    /* Shadows */
    --shadow-card: 0 2px 12px rgba(10, 22, 40, 0.08);
    --shadow-hover: 0 6px 24px rgba(10, 22, 40, 0.14);
    
    /* Fonts Stack */
    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'DM Mono', monospace;
}

/* 2. BASE RESET & NORMALIZATION */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    background-color: var(--bg-page);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-primary);
    line-height: 1.25;
    font-weight: 700;
    margin-bottom: var(--space-3);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; border-bottom: 2px solid var(--border-color); padding-bottom: var(--space-2); margin-top: var(--space-6); }
h3 { font-size: 1.5rem; margin-top: var(--space-4); }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--space-4);
    color: var(--text-secondary);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}

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

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

/* Lists */
ul, ol {
    margin-bottom: var(--space-4);
    padding-left: var(--space-5);
    color: var(--text-secondary);
}

li {
    margin-bottom: var(--space-2);
}

/* 3. LAYOUT UTILITIES */
.container {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-4);
    padding-right: var(--space-4);
}

.grid {
    display: grid;
    gap: var(--space-5);
}

.grid-2 { grid-template-columns: repeat(1, 1fr); }
.grid-3 { grid-template-columns: repeat(1, 1fr); }
.grid-4 { grid-template-columns: repeat(2, 1fr); }

@media (min-width: 768px) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Flexbox Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.justify-between { justify-content: space-between; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

/* Spacing Helpers */
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }

/* Margins Outer */
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }

/* Text colors */
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--color-success) !important; }
.text-error { color: var(--color-error) !important; }
.font-mono { font-family: var(--font-mono); }

/* 4. STICKY TOP HEADER */
.site-header {
    background-color: var(--color-primary);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 4px 12px rgba(10, 22, 40, 0.1);
}

.header-container {
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo block */
.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-text {
    font-family: var(--font-heading);
    color: #FFFFFF;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-icon {
    width: 32px;
    height: 32px;
}

/* Header main navigation */
.main-nav {
    display: none; /* Hidden on mobile */
}

.nav-menu {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--space-5);
    padding: 0;
    margin: 0;
}

.nav-link {
    color: #E2E8F0;
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--space-2) 0;
    border-bottom: 2px solid transparent;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-accent);
}

/* DROP-DOWN CALCULATORS MENU (6 Categories) */
.dropdown {
    position: relative;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    cursor: pointer;
}

.dropdown-arrow {
    transition: transform 0.2s ease;
}

.dropdown:hover .dropdown-arrow {
    transform: translateY(1.5px);
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-surface);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(10, 22, 40, 0.15);
    width: 580px;
    padding: var(--space-4);
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    margin-top: var(--space-2);
    z-index: 1100;
}

.dropdown:hover .dropdown-content {
    display: grid;
    animation: fadeDropDown 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeDropDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.dropdown-content a {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: 6px;
    background-color: transparent;
    transition: background-color 0.15s ease;
}

.dropdown-content a:hover {
    background-color: #F8FAFC;
    color: var(--text-primary);
}

.category-icon {
    font-size: 1.25rem;
    background-color: #F1F5F9;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    flex-shrink: 0;
}

.dropdown-content a:hover .category-icon {
    background-color: #FEEFDB;
    color: var(--color-accent);
}

.category-info {
    display: flex;
    flex-direction: column;
}

.category-title {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 2px;
}

.category-desc {
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

/* Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.header-cta {
    display: none; /* Resized on small screens */
}

/* HAMBURGER TRIGGERS */
.mobile-menu-toggle {
    background: none;
    border: none;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    border-radius: 6px;
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.mobile-menu-toggle:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.hamburger-bar {
    width: 20px;
    height: 2px;
    background-color: #FFFFFF;
    border-radius: 2px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Active hamburger transition */
.mobile-menu-toggle.active .hamburger-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.mobile-menu-toggle.active .hamburger-bar:nth-child(2) {
    opacity: 0;
}
.mobile-menu-toggle.active .hamburger-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* 5. RESPONSIVE HEADERS NAVIGATION (Tablet & Desktop) */
@media (min-width: 1024px) {
    .main-nav {
        display: block;
    }

    .header-cta {
        display: inline-block;
    }

    .mobile-menu-toggle {
        display: none;
    }
}

/* Mobile Nav Styles in expanded state */
@media (max-width: 1023px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background-color: var(--color-primary);
        padding: var(--space-4) var(--space-5);
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        border-bottom: 2px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(10, 22, 40, 0.15);
    }

    .main-nav.active {
        display: block;
    }

    .nav-menu {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-2);
    }

    .nav-link {
        display: block;
        padding: var(--space-3) 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    /* Dropdown in Mobile lists */
    .dropdown .dropdown-content {
        display: none;
        position: static;
        transform: none;
        width: 100%;
        grid-template-columns: 1fr;
        padding: 0 0 0 var(--space-4);
        border: none;
        box-shadow: none;
        margin-top: 0;
        background-color: transparent;
    }

    .dropdown.open .dropdown-content {
        display: grid;
    }

    .dropdown.open .dropdown-arrow {
        transform: rotate(180deg);
    }

    .dropdown-content a {
        padding: var(--space-2) 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.02);
    }
    
    .dropdown-content a:hover {
        background-color: transparent;
    }
    
    .category-title {
        color: #E2E8F0;
    }
    
    .category-desc {
        color: #94A3B8;
    }
}

/* 6. BUTTON UI ELEMENTS (Radius 24px) */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 0.95rem;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-button);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    text-align: center;
    outline: none;
}

.btn-sm {
    font-size: 0.85rem;
    padding: var(--space-2) var(--space-4);
}

.btn-lg {
    font-size: 1.05rem;
    padding: var(--space-4) var(--space-6);
}

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

.btn-primary:hover {
    background-color: #122138;
}

.btn-accent {
    background-color: var(--color-accent);
    color: var(--color-primary);
    box-shadow: 0 2px 4px rgba(245, 166, 35, 0.2);
}

.btn-accent:hover {
    background-color: var(--color-accent-hover);
    color: var(--color-primary);
    box-shadow: 0 4px 8px rgba(245, 166, 35, 0.35);
}

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

.btn-secondary:hover {
    background-color: #F8FAFC;
    border-color: #94A3B8;
}

/* 7. STANDARD CARD INTERFACES */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-card);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-card);
    padding: var(--space-5);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: #CBD5E1;
}

/* 8. FORM DESIGN PATTERNS */
.form-group {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: var(--space-3);
    color: var(--text-primary);
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-input);
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.15);
}

.form-checkbox-container {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
}

.form-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--color-accent);
}

/* 9. CALCULATOR LAYOUT GRID & STRUCTURES */
.calculator-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    background-color: var(--color-surface);
    border-radius: var(--radius-card);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-card);
    margin-bottom: var(--space-6);
}

@media (min-width: 992px) {
    .calculator-wrapper {
        grid-template-columns: 55% 45%;
    }
}

.calc-input-section {
    padding: var(--space-5);
    border-bottom: 2px solid var(--border-color);
}

@media (min-width: 992px) {
    .calc-input-section {
        padding: var(--space-6);
        border-bottom: none;
        border-right: 2px solid var(--border-color);
    }
}

.calc-output-section {
    padding: var(--space-5);
    background-color: #F8FAFC;
}

@media (min-width: 992px) {
    .calc-output-section {
        padding: var(--space-6);
    }
}

/* Highlighted box results */
.calc-result-box {
    background-color: var(--color-primary);
    border-radius: var(--radius-card);
    padding: var(--space-4);
    text-align: center;
    color: #FFFFFF;
    margin-bottom: var(--space-4);
}

.calc-result-label {
    font-size: 0.82rem;
    font-weight: 500;
    color: #94A3B8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-1);
}

.calc-result-val {
    font-family: var(--font-mono);
    font-size: 1.85rem;
    font-weight: 700;
    color: var(--color-accent);
}

/* Detail calculation lines */
.calc-breakdown-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--space-3);
    font-size: 0.9rem;
}

.calc-breakdown-table th, .calc-breakdown-table td {
    padding: var(--space-2) 0;
    text-align: left;
}

.calc-breakdown-table th {
    font-weight: 700;
    color: var(--color-primary);
    border-bottom: 2px solid var(--border-color);
}

.calc-breakdown-table td {
    color: var(--text-secondary);
    border-bottom: 1px dashed var(--border-color);
}

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

.calc-breakdown-table .row-total td {
    font-weight: 700;
    color: var(--color-primary);
    font-size: 1rem;
    border-top: 2px solid var(--border-color);
}

/* 10. CLS AD-PLACEMENTS (PRESERVE MIN HEIGHTS) */
.ad-slot {
    background-color: #F8FAFC;
    border: 1px dashed var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-body);
    font-size: 0.68rem;
    color: #A0AEC0;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    text-align: center;
    margin: var(--space-5) auto;
    width: 100%;
}

.ad-slot-rect {
    min-height: 250px;
    background-color: #F8FAFC;
    border: 1px dashed var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-body);
    font-size: 0.68rem;
    color: #A0AEC0;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    text-align: center;
    margin: var(--space-5) auto;
    width: 100%;
}

.ad-slot-728x90 {
    min-height: 90px;
    max-width: 728px;
}

.ad-slot-300x250 {
    min-height: 250px;
    max-width: 300px;
}

.ad-slot-300x600 {
    min-height: 600px;
    max-width: 300px;
}

.ad-slot-320x50 {
    min-height: 50px;
    max-width: 320px;
}

.ad-slot-responsive {
    min-height: 250px;
    width: 100%;
}

/* 11. BREADCRUMBS */
.breadcrumbs {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    padding: 0;
}

.breadcrumb-item a {
    color: var(--text-secondary);
}

.breadcrumb-item a:hover {
    color: var(--color-accent);
}

.breadcrumb-separator {
    color: #CBD5E1;
}

/* 12. FAQ ENGINE ACCORDIONS */
.faq-section {
    margin-top: var(--space-7);
}

.faq-item {
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-card);
    margin-bottom: var(--space-3);
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4);
    font-family: var(--font-heading);
    font-size: 1.12rem;
    font-weight: 700;
    color: var(--color-primary);
    cursor: pointer;
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
    outline: none;
}

.faq-question:hover {
    background-color: #F8FAFC;
}

.faq-answer {
    padding: 0 var(--space-4) var(--space-4);
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.faq-icon {
    width: 18px;
    height: 18px;
    transition: transform 0.2s ease;
    flex-shrink: 0;
    color: var(--text-secondary);
}

/* 13. AUTHOR & EEAT BOXES */
.author-box {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    background-color: #FFFFFF;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-card);
    padding: var(--space-5);
    margin-top: var(--space-6);
}

@media (min-width: 640px) {
    .author-box {
        flex-direction: row;
        align-items: center;
    }
}

.author-avatar {
    width: 64px;
    height: 64px;
    background-color: #E2E8F0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-primary);
    flex-shrink: 0;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-meta {
    font-size: 0.88rem;
    color: var(--color-primary);
    font-weight: 700;
    margin-bottom: var(--space-1);
}

.author-credentials {
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-2);
}

.author-bio {
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

/* 14. FOOTER INTERFACE (4-COLUMNS RESILIENT) */
.site-footer {
    background-color: var(--color-primary);
    border-top: 5px solid var(--color-accent);
    color: #E2E8F0;
    padding: var(--space-7) 0 var(--space-5);
    margin-top: auto;
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-7);
}

.footer-grid {
    display: grid;
    gap: var(--space-6);
    grid-template-columns: 1fr;
}

@media (min-width: 576px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .footer-grid {
        grid-template-columns: 35% repeat(3, 1fr);
    }
}

.brand-col {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.footer-logo .logo-text {
    font-size: 1.45rem;
}

.footer-description {
    font-size: 0.85rem;
    line-height: 1.6;
    color: #94A3B8 !important;
}

.footer-tagline {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-heading {
    color: #FFFFFF;
    font-size: 1.15rem;
    margin-bottom: var(--space-4);
    position: relative;
    padding-bottom: var(--space-2);
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 32px;
    height: 2px;
    background-color: var(--color-accent);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-link {
    color: #94A3B8;
    font-size: 0.85rem;
    display: block;
    padding: var(--space-1) 0;
    transition: color 0.15s ease, padding-left 0.15s ease;
}

.footer-link:hover {
    color: var(--color-accent);
    padding-left: 2px;
}

/* Bottom Disclaimer and Copyright */
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.legal-notice {
    font-size: 0.76rem;
    line-height: 1.5;
    color: #64748B !important;
    text-align: justify;
}

.footer-copyright-and-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    font-size: 0.78rem;
    color: #64748B;
}

@media (min-width: 768px) {
    .footer-copyright-and-meta {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

.meta-market {
    font-family: var(--font-mono);
    font-size: 0.72rem;
}