/* Import component styles - Cache Bust */
@import url('./language-switcher.css?v=2');
@import url('./enhanced-components.css?v=2');
@import url('./accessibility-enhancements.css');
@import url('./comfort-adjustments.css');
@import url('./facebook-style.css');
@import url('./colorblind-enhancements.css');
@import url('./revenue-widgets.css');
@import url('./blog-styles.css');

/* CSS Variables for theming - Enhanced Professional Colors */
:root {
    /* Primary Brand Colors - Colorblind Accessible */
    --primary-color: #0056b3;
    --primary-solid: #0056b3;
    --primary-hover: #004085;
    --primary-light: rgba(0, 86, 179, 0.1);
    --primary-dark: #003d82;
    
    /* Secondary Colors - Facebook Style */
    --secondary-color: #65676b;
    --accent-color: #42a5f5;
    --accent-solid: #42a5f5;
    
    /* Status Colors - Colorblind Safe */
    --success-color: #28a745;
    --error-color: #dc3545;
    --warning-color: #fd7e14;
    --info-color: #17a2b8;
    
    /* Background Colors - High Contrast */
    --bg-color: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --bg-gradient: linear-gradient(135deg, #0056b3 0%, #004085 100%);
    
    /* Text Colors - Maximum Readability */
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    --text-accent: #0056b3;
    
    /* Border and Dividers - Facebook Style */
    --border-color: #dadde1;
    --border-hover: #1877f2;
    
    /* Enhanced Shadows - Facebook Style */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1), 0 8px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.12), 0 16px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.15), 0 24px 40px rgba(0, 0, 0, 0.15);
    --shadow-colored: 0 2px 8px rgba(24, 119, 242, 0.15);
    
    /* Language switcher specific variables */
    --card-background: #ffffff;
    --text-color: #1c1e21;
    --primary-color-light: rgba(24, 119, 242, 0.1);
    --primary-color-dark: #166fe5;
    
    /* Spacing and Sizing - Facebook Style */
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-sm: 6px;
}

[data-theme="dark"] {
    /* Dark Mode - Facebook Style */
    --bg-color: #18191a;
    --bg-secondary: #242526;
    --bg-card: #242526;
    --bg-gradient: linear-gradient(135deg, #1877f2 0%, #166fe5 100%);
    
    --text-primary: #e4e6ea;
    --text-secondary: #b0b3b8;
    --text-muted: #8a8d91;
    --text-accent: #58a6ff;
    
    --border-color: #404040;
    --border-hover: #7bb3f0;
    
    /* Enhanced dark shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.4);
    --shadow-colored: 0 8px 32px rgba(76, 81, 191, 0.3);
    
    --card-background: rgba(45, 55, 72, 0.95);
    --text-color: #f7fafc;
    --primary-color-light: rgba(144, 205, 244, 0.15);
    --primary-color-dark: #90cdf4;
}

/* Reset and base styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    overflow-x: hidden; /* Prevent horizontal scroll on mobile */
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-color);
    font-size: 16px;
    font-weight: 400;
    transition: background 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden; /* Prevent horizontal scroll on mobile */
    width: 100%;
}

/* Typography - Enhanced Modern Typography */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    margin-bottom: 0.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

h1 { 
    font-size: 3rem;
    background: var(--bg-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
}
h2 { 
    font-size: 2.25rem;
    color: var(--text-primary);
}
h3 { 
    font-size: 1.75rem;
    color: var(--primary-solid);
}
h4 { font-size: 1.375rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

a {
    color: var(--primary-solid);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

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

a:focus {
    outline: 2px solid var(--primary-light);
    outline-offset: 2px;
    border-radius: var(--border-radius-sm);
}

/* Layout */
.container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header - Enhanced with Glass Effect & Smart Behavior */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}


/* Smart header behavior for blog pages */
body.blog-page header {
    transform: translateZ(0); /* Enable hardware acceleration */
}

/* Compact header when scrolling (blog pages) */
.header-scrolled {
    padding: 0.5rem 0 !important;
    background: rgba(255, 255, 255, 0.98) !important;
    backdrop-filter: blur(15px) !important;
    -webkit-backdrop-filter: blur(15px) !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1) !important;
    border-bottom: 1px solid rgba(0,0,0,0.1) !important;
}

.header-scrolled .header-content {
    padding: 0.5rem 1rem !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.header-scrolled .logo {
    font-size: 1.25rem !important;
    transition: font-size 0.3s ease !important;
}

.header-scrolled .logo svg {
    width: 24px !important;
    height: 24px !important;
    transition: all 0.3s ease !important;
}

/* Dark mode support for scrolled header */
[data-theme="dark"] .header-scrolled {
    background: rgba(26, 32, 44, 0.98) !important;
    border-bottom: 1px solid rgba(255,255,255,0.1) !important;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    gap: 0.75rem;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.625rem;
    font-weight: 900;
    color: var(--primary-solid);
    transition: color 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 0;
}

.logo:hover {
    transform: scale(1.02);
    filter: brightness(1.1);
}

.logo svg {
    width: 32px;
    height: 32px;
    margin-right: 0.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 1.5rem;
    flex-wrap: nowrap;
}

.nav-menu a {
    font-weight: 500;
    color: var(--text-primary);
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s ease;
    white-space: nowrap;
}

.nav-menu a:hover {
    border-bottom-color: var(--primary-solid);
    color: var(--primary-hover);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.header-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: #2563eb;
    color: #fff !important;
    text-decoration: none !important;
    padding: 0.45rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.85rem;
    font-weight: 700;
    white-space: nowrap;
    transition: background 0.2s, transform 0.15s;
    box-shadow: 0 2px 8px rgba(37,99,235,0.35);
}
.header-download-btn:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 6px;
    line-height: 0;
    transition: background 0.2s ease;
}
.mobile-menu-btn:hover,
.mobile-menu-btn.active {
    background: var(--primary-light);
}

/* Theme toggle - Modern Glass Effect */
.theme-toggle {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    background: rgba(102, 126, 234, 0.1);
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ── Why-section: stats bar + feature cards (homepage, above first ad) ───── */
.why-section {
    margin: 2rem 0;
}

.stats-bar {
    display: flex;
    justify-content: center;
    gap: 0;
    background: var(--primary-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    min-width: 120px;
    padding: 0.5rem 1rem;
    border-right: 1px solid rgba(255,255,255,0.2);
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    color: #fff;
    line-height: 1;
}

.stat-label {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.85);
    text-align: center;
    margin-top: 0.3rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem 1.25rem;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    line-height: 1;
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .stats-bar {
        gap: 0.5rem;
        padding: 1rem;
    }
    .stat-item {
        border-right: none;
        min-width: 90px;
    }
    .stat-number {
        font-size: 1.4rem;
    }
}

@media (max-width: 480px) {
    .features-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
    }
    .feature-card {
        padding: 1rem 0.75rem;
    }
}

/* Hero section - Enhanced with Modern Design */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--bg-secondary);
    margin: 2rem 0;
    border-radius: var(--border-radius-lg);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    z-index: 1;
}

.hero * {
    position: relative;
    z-index: 2;
}

.hero h1 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* Search */
.search-container {
    max-width: 480px;
    margin: 0 auto;
    position: relative;
}

#calculator-search {
    width: 100%;
    padding: 0.85rem 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.75rem;
    font-size: 1rem;
    background-color: var(--bg-card);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    box-sizing: border-box;
}

#calculator-search:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgb(37 99 235 / 0.15);
}

/* Live search dropdown */
#search-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    z-index: 9999;
    overflow: hidden;
    max-height: 420px;
    overflow-y: auto;
}
#search-dropdown.active { display: block; }

.search-result-item {
    display: flex;
    flex-direction: column;
    padding: 0.75rem 1rem;
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.15s;
    gap: 0.15rem;
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--bg-secondary); }

.search-result-badge {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #2563eb;
}
.search-result-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}
.search-result-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
}
.search-no-results {
    padding: 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Categories */
.categories {
    margin: 3rem 0;
}

.category-section {
    margin-bottom: 3rem;
}

.category-section h2 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

/* Calculator grid */
.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.calculator-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
    text-decoration: none;
    color: inherit;
}

.calculator-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.calculator-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.calculator-card p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.875rem;
}

/* All calculators section */
.all-calculators {
    margin: 3rem 0;
    text-align: center;
}

.calculator-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1rem;
}

.calculator-links a {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.calculator-links a:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Card component */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

/* Form elements */
.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    background-color: var(--bg-card);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus, select:focus, textarea:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.2);
}

/* Buttons */
button, .btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 44px;
    white-space: nowrap;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
}

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

button:active, .btn:active {
    transform: translateY(0);
}

button:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Results */
.result-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-top: 1rem;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.result-details {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Ad slots - Enhanced for CLS Prevention */
/* ── Base ad slot ────────────────────────────────────────────────────── */
.ad-slot {
    position: relative;
    min-height: 90px;
    margin: 1.5rem 0;
    background-color: var(--bg-secondary);
    border-radius: 6px;
    display: block;
    box-sizing: border-box;
    width: 100%;
    overflow: hidden;
    text-align: center;
}

/* "Advertisement" label shown above slot (not overlapping the actual ad) */
.ad-slot::before {
    content: "Advertisement";
    display: block;
    font-size: 0.6875rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 4px;
    padding-top: 6px;
}

/* Responsive ins tag inside slots */
.ad-slot ins.adsbygoogle {
    display: block !important;
    width: 100%;
}

/* ── Calculator page slots ────────────────────────────────────────────── */

/* Top: leaderboard — repositioned by JS between content sections 1 and 2.
   Hidden on mobile: the long form pushes it far below fold (near-zero viewability).
   Mobile coverage is handled by the sticky bottom banner instead. */
#ad-top {
    min-height: 100px;
    max-width: 728px;
    margin: 2rem auto;
}

@media (max-width: 900px) {
    #ad-top { display: none; }
}

/* Mid: 300×250 rectangle between form and content — solid CTR */
#ad-mid {
    min-height: 260px;
    max-width: 336px;
    margin: 2rem auto;
}

/* Result: 336×280 — HIGHEST CTR position: user just got their answer */
.ad-result-slot,
#ad-result {
    min-height: 280px;
    max-width: 336px;
    margin: 1.5rem auto 2rem;
    border-top: 2px solid var(--border-color);
    padding-top: 0.5rem;
}

/* Bottom: leaderboard before related links */
#ad-bottom {
    min-height: 100px;
    max-width: 728px;
    margin: 2rem auto 1rem;
}

/* ── Desktop sidebar ─────────────────────────────────────────────────── */
/* Flex wrapper injected by JS around .calculator-container + aside */
.calculator-with-sidebar {
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
}

.calculator-with-sidebar .calculator-container {
    flex: 1;
    min-width: 0;
    max-width: 680px;
    margin: 0;
}

.ad-sidebar {
    flex-shrink: 0;
    width: 300px; /* supports 300×250 (most-filled) and 300×600 (premium) */
    position: sticky;
    top: 90px;
}

.ad-sidebar-slot {
    min-height: 250px; /* at minimum shows 300×250 rectangle */
    width: 300px;
    margin: 0;
}

/* ── Blog post ad slots ──────────────────────────────────────────────── */
#ad-blog-top,
#ad-blog-bottom {
    min-height: 100px;
    max-width: 728px;
    margin: 2rem auto;
}

#ad-blog-mid,
#ad-blog-mid2 {
    min-height: 260px;
    max-width: 336px;
    margin: 2rem auto;
}

/* ── Homepage Ad Slots ─────────────────────────────────────── */
.ad-homepage {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    overflow: hidden;
    box-sizing: border-box;
}

/* Visible "Advertisement" label above each slot */
.ad-homepage::before {
    content: "Advertisement";
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    pointer-events: none;
    white-space: nowrap;
}

/* Leaderboard: 728×90 responsive — full width, short */
.ad-homepage.ad-leaderboard {
    min-height: 100px;
    max-width: 970px;
    margin: 1.5rem auto;
}

/* Medium rectangle: 300×250 — centered, better CTR */
.ad-homepage.ad-rectangle {
    min-height: 280px;
    max-width: 336px;
    margin: 1.5rem auto;
}

/* Pre-footer leaderboard — full width, generous margin */
.ad-homepage.ad-prefooter {
    max-width: 970px;
    margin: 2rem auto 1rem;
}

/* Mobile: stack all ads to full width */
@media (max-width: 767px) {
    .ad-homepage.ad-leaderboard,
    .ad-homepage.ad-rectangle,
    .ad-homepage.ad-prefooter {
        max-width: 100%;
        min-height: 60px;
        margin: 1rem 0;
    }
}

/* ── Sticky mobile bottom anchor banner ──────────────────────────────── */
/* Compliant with AdSense anchor ad policy: fixed, closeable, not covering nav */
/* CLS fix: padding reserved immediately via body class so layout doesn't
   jump when the ad appears after 3 seconds. The banner itself slides in
   via transform so it doesn't cause a reflow on the page content. */
body.has-sticky-ad {
    padding-bottom: 70px;
}

.ad-sticky-mobile {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    min-height: 70px;
    background-color: var(--bg-card);
    border-top: 2px solid var(--border-color);
    z-index: 950;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4px 36px 4px 8px;
    box-shadow: 0 -4px 16px rgba(0,0,0,0.12);
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.ad-sticky-mobile.visible {
    transform: translateY(0);
}

.ad-sticky-label {
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 2px;
}

.ad-sticky-slot {
    width: 100%;
    max-width: 320px;
    min-height: 50px;
}

.ad-sticky-close {
    position: absolute;
    top: 6px;
    right: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    padding: 0;
}

/* Calculator-specific layouts */
.calculator-container {
    max-width: 600px;
    margin: 0 auto;
}

.calculator-tool {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.input-full {
    grid-column: 1 / -1;
}

/* Content sections */
.content-section {
    margin: 3rem 0;
    background-color: var(--bg-card);
    border-radius: 0.75rem;
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.content-section h2 {
    color: var(--text-primary);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.faq-item {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.faq-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.faq-question {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.faq-answer {
    color: var(--text-secondary);
}

/* Code blocks */
code {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
}

pre {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    overflow-x: auto;
    margin: 1rem 0;
}

pre code {
    background: none;
    padding: 0;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
    border-left: 4px solid;
}

.alert-info {
    background-color: rgb(59 130 246 / 0.1);
    border-left-color: var(--primary-color);
    color: var(--text-primary);
}

.alert-success {
    background-color: rgb(16 185 129 / 0.1);
    border-left-color: var(--success-color);
    color: var(--text-primary);
}

.alert-warning {
    background-color: rgb(245 158 11 / 0.1);
    border-left-color: var(--warning-color);
    color: var(--text-primary);
}

.alert-error {
    background-color: rgb(239 68 68 / 0.1);
    border-left-color: var(--error-color);
    color: var(--text-primary);
}

/* Footer */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1.5rem;
    margin-top: 3rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Multi-column footer grid */
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

.footer-section h3,
.footer-section h4 {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

/* Remove bullet points from footer lists */
.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-decoration: none;
    transition: color 0.15s ease;
    line-height: 1.5;
}

.footer-section ul li a:hover {
    color: var(--primary-solid);
}

/* Trust signals */
.footer-trust-signals {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
}

.trust-signal {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.trust-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

/* Footer bottom bar */
.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-company-info p,
.footer-copyright p {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    line-height: 1.5;
}

.footer-company-info a,
.footer-copyright a {
    color: var(--primary-solid);
}

.footer-disclaimer {
    font-size: 0.75rem !important;
    opacity: 0.75;
}

/* Legacy .footer-links support */
.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-align: center;
}

/* 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: 0;
}

/* Enhanced Accessibility & Focus Management */
*:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--border-radius-sm);
}

/* Enhanced keyboard navigation */
.nav-menu a:focus-visible,
button:focus-visible,
.btn:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 6px rgba(0, 86, 179, 0.15);
}

/* Touch-friendly hover states */
@media (hover: hover) and (pointer: fine) {
    .calculator-card:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-md);
        border-color: var(--primary-color);
    }
    
    button:hover, .btn:hover {
        transform: translateY(-1px);
    }
    
    .theme-toggle:hover {
        transform: translateY(-2px);
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .calculator-card:hover {
        transform: none;
    }
    
    button:hover, .btn:hover {
        transform: none;
    }
    
    .theme-toggle:hover {
        transform: none;
    }
    
    /* Larger tap targets for touch devices */
    button, .btn {
        min-height: 50px;
        padding: 1rem 1.5rem;
    }
    
    .mobile-menu-btn {
        min-height: 48px;
        min-width: 48px;
    }
}

/* Enhanced Mobile & Desktop Optimization */

/* Tablet optimizations (768-1024px) */
@media (min-width: 900px) and (max-width: 1024px) {
    .container {
        max-width: 860px;
        padding: 0 1.5rem;
    }
    
    .calculator-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .input-row {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    
    .hero {
        padding: 3rem 2rem;
    }
    
    .calculator-tool {
        padding: 2rem;
    }
}

/* Mobile optimizations (max-width: 900px) */
@media (max-width: 900px) {
    .container {
        padding: 0 1rem;
    }
    
    /* Fix 3: Force all grid layouts inside calculator forms to single column */
    .calculator-tool [style*="grid-template-columns"],
    .calculator-tool .form-row,
    .calculator-tool .grid {
        grid-template-columns: 1fr !important;
    }
    
    /* Fluid Typography for Better Mobile Readability */
    h1 { 
        font-size: clamp(1.5rem, 4vw, 2.25rem);
        line-height: 1.2;
        margin-bottom: 1rem;
    }
    h2 { 
        font-size: clamp(1.25rem, 3.5vw, 1.75rem);
        line-height: 1.3;
    }
    h3 { 
        font-size: clamp(1.125rem, 3vw, 1.5rem);
        line-height: 1.3;
    }
    
    /* Body text optimization */
    body {
        font-size: clamp(14px, 2.5vw, 16px);
        line-height: 1.6;
    }
    
    .header-content {
        padding: 0.75rem 1rem;
        min-height: 56px;
    }
    
    .logo {
        font-size: clamp(1rem, 3.5vw, 1.375rem);
    }

    .logo-text {
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        max-width: 180px;
    }

    /* Hide language selector on mobile — saves header space */
    #language-selector-container {
        display: none;
    }

    /* Ensure header-actions don't overflow */
    .header-actions {
        flex-shrink: 0;
        gap: 0.5rem;
    }
    
    .nav-menu {
        display: none;
        position: fixed;
        top: 56px; /* just below the header */
        left: 0;
        right: 0;
        background-color: var(--bg-card);
        border-bottom: 2px solid var(--border-color);
        flex-direction: column;
        padding: 0.75rem 1rem 1rem;
        gap: 0.25rem;
        box-shadow: 0 8px 24px rgba(0,0,0,0.15);
        z-index: 99;
        max-height: calc(100vh - 56px);
        overflow-y: auto;
    }
    
    .nav-menu a {
        padding: 0.875rem 1rem;
        min-height: 48px;
        display: flex;
        align-items: center;
        font-size: 1rem;
        font-weight: 500;
        border-radius: 8px;
        transition: background 0.15s ease;
        border-bottom: none;
    }
    
    .nav-menu a:hover,
    .nav-menu a:focus {
        background-color: var(--primary-light);
        color: var(--primary-solid);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 44px;
        min-width: 44px;
    }

    .header-download-btn {
        display: none;
    }
    
    .hero {
        padding: 2rem 1rem;
        margin: 1rem 0;
        text-align: center;
    }
    
    .hero-description {
        font-size: clamp(1rem, 2.5vw, 1.125rem);
        line-height: 1.6;
        margin-bottom: 1.5rem;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
    
    .calculator-card {
        padding: 1.5rem;
        /* Ensure touch-friendly cards */
        min-height: 120px;
    }
    
    .input-row {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .calculator-tool {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }
    
    /* Enhanced Form Elements for Mobile */
    input, select, textarea {
        min-height: 44px; /* Touch-friendly minimum */
        padding: 0.875rem;
        font-size: max(16px, 1rem); /* Prevent zoom on iOS */
        border-radius: var(--border-radius);
    }
    
    /* Enhanced Buttons for Touch */
    button, .btn {
        min-height: 48px; /* Larger touch targets */
        font-size: 1rem;
        font-weight: 600;
    }
    /* Only make calculator action buttons full-width */
    .calculator-tool .btn,
    .calculator-tool button[type="submit"],
    .calculator-tool button[type="button"]:not(.theme-toggle):not(.mobile-menu-btn) {
        width: 100%;
        padding: 0.875rem 1.5rem;
        margin-bottom: 0.5rem;
    }
    
    .btn-secondary {
        margin-top: 0.5rem;
    }
    
    .content-section {
        padding: 1.5rem;
        margin: 1.5rem 0;
    }
    
    .footer-links {
        gap: 1rem;
        flex-direction: column;
        align-items: center;
    }
    
    .footer-links a {
        padding: 0.5rem;
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    /* Enhanced Search for Mobile */
    #calculator-search {
        min-height: 48px;
        padding: 0.875rem 1rem;
        font-size: max(16px, 1rem); /* Prevent zoom */
    }
    
    /* Mobile-optimized Calculator Links */
    .calculator-links a {
        min-height: 44px;
        padding: 0.75rem 1rem;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.875rem;
        margin: 0.25rem;
    }
    
    /* Tables: scroll horizontally on mobile instead of overflowing */
    table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        max-width: 100%;
        font-size: 0.875rem;
    }

    /* Prevent any element from breaking page width */
    img, video, iframe, embed, object {
        max-width: 100%;
        height: auto;
    }

    /* Footer — stack to single column on mobile */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-trust-signals {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    /* Ad slots on mobile — full width, proper heights */
    .ad-slot {
        min-height: 100px;
        margin: 1rem auto;
        max-width: 100%;
        overflow: hidden;
    }

    #ad-mid, #ad-result {
        min-height: 250px;
        max-width: 100%;
    }

    /* Show sticky mobile banner on small screens */
    .ad-sticky-mobile {
        display: flex;
    }
    
    /* Form Group Spacing */
    .form-group {
        margin-bottom: 1.25rem;
    }
    
    label {
        font-size: 1rem;
        margin-bottom: 0.75rem;
        font-weight: 600;
    }
    
    /* Result Container Mobile Optimization */
    .result-container {
        padding: 1.25rem;
        margin-top: 1.25rem;
    }
    
    .result-value {
        font-size: clamp(1.25rem, 4vw, 1.75rem);
        margin-bottom: 0.75rem;
    }

/* Small Mobile Devices (max-width: 480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .hero {
        padding: 1.75rem 0.75rem;
    }
    
    .hero h1 {
        font-size: clamp(1.375rem, 5vw, 2rem);
        margin-bottom: 0.75rem;
    }
    
    .calculator-tool {
        padding: 1.25rem;
    }
    
    .content-section {
        padding: 1.25rem;
    }
    
    /* Compact Header for Small Screens */
    .header-content {
        padding: 0.6rem 0.75rem;
    }
    
    .logo {
        font-size: 1rem;
    }

    .logo svg {
        width: 22px;
        height: 22px;
        margin-right: 0.3rem;
    }

    /* Shrink logo text on very small screens — but keep it visible */
    .logo-text {
        font-size: 0.8125rem;
        max-width: 140px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    /* Hide language selector on tiny screens */
    #language-selector-container,
    .language-selector {
        display: none;
    }
    
    /* Enhanced Touch Targets for Small Screens */
    button, .btn {
        min-height: 50px;
        padding: 1rem 1.5rem;
        font-size: 1rem;
        font-weight: 600;
    }
    
    input, select, textarea {
        min-height: 48px;
        padding: 1rem;
        font-size: max(16px, 1.125rem);
    }
    
    /* Calculator Grid Optimization */
    .calculator-card {
        padding: 1.25rem;
        min-height: 110px;
    }
    
    .calculator-card h3 {
        font-size: 1.125rem;
        margin-bottom: 0.5rem;
    }
    
    /* Form Group Compact */
    .form-group {
        margin-bottom: 1rem;
    }
    
    .input-row {
        gap: 0.75rem;
    }
}

/* Desktop Enhancements (min-width: 1025px) */
@media (min-width: 1025px) {
    .container {
        max-width: 1100px;
        padding: 0 2rem;
    }
    
    .calculator-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 2rem;
    }
    
    .calculator-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-lg);
    }
    
    .hero {
        padding: 5rem 3rem;
    }
    
    .calculator-tool {
        padding: 2.5rem;
    }
    
    .content-section {
        padding: 2.5rem;
    }
    
    /* Desktop Button Hover Effects */
    button:hover, .btn:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-lg);
    }
    
    /* Enhanced Form Layout for Desktop */
    .input-row {
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
    }
    
    /* Desktop-specific improvements */
    .nav-menu {
        gap: 2.5rem;
    }
    
    .header-actions {
        gap: 1.5rem;
    }
}

/* Large Desktop (min-width: 1440px) */
@media (min-width: 1440px) {
    .container {
        max-width: 1200px;
    }
    
    .calculator-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 2.5rem;
    }
    
    .hero {
        padding: 6rem 4rem;
    }
}

/* Print styles */
@media print {
    .header, .footer, .ad-slot, .theme-toggle {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .card, .calculator-tool, .content-section {
        border: 1px solid #ccc;
        box-shadow: none;
    }
}