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

:root {
    --primary: #2563eb;
    --secondary: #3b82f6;
    --background: #ffffff;
    --text: #1f2937;
    --accent: #10b981;
    --light-gray: #f3f4f6;
    --gray: #9ca3af;
    --dark-gray: #374151;
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    color: var(--text);
    background-color: var(--background);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

h2 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
}

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

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

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--secondary);
    color: white;
    transform: translateY(-2px);
}

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

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

/* ===== HEADER ===== */
.header {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    height: 40px;
    width: auto;
}

.site-title {
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* ===== NAVIGATION ===== */
.nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--text);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.nav-link.active {
    color: var(--primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary);
}

.nav-link:hover {
    color: var(--primary);
}

/* Dropdown */
.dropdown {
    position: absolute;
    top: 100%;
    left: -1rem;
    background: white;
    border-radius: var(--radius);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
    min-width: 600px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 1000;
}

.nav-item:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.dropdown-categories h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray);
    margin-bottom: 0.75rem;
}

.dropdown-categories a {
    display: block;
    padding: 0.375rem 0;
    color: var(--text);
    font-weight: 500;
}

.dropdown-categories a:hover {
    color: var(--primary);
    padding-left: 0.5rem;
}

.dropdown-view-all {
    display: block;
    text-align: center;
    padding: 0.75rem;
    background-color: var(--light-gray);
    border-radius: var(--radius);
    font-weight: 600;
}

.dropdown-view-all:hover {
    background-color: var(--primary);
    color: white;
}

/* ===== ADVERTISEMENTS ===== */
.ad-container {
    background-color: var(--light-gray);
    border-bottom: 1px solid var(--border);
}

.ad-header, .ad-footer, .ad-middle {
    padding: 1rem 0;
    text-align: center;
}

.ad-label {
    font-size: 0.75rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.ad-placeholder {
    width: 100%;
    background: linear-gradient(135deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
    color: var(--gray);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
}

.ad-header .ad-placeholder {
    height: 90px;
    max-width: 728px;
    margin: 0 auto;
}

.ad-footer .ad-placeholder {
    height: 90px;
    max-width: 728px;
    margin: 0 auto;
}

.ad-middle .ad-placeholder {
    height: 250px;
    max-width: 300px;
    margin: 0 auto;
    border-radius: var(--radius);
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* ===== HERO SECTION ===== */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--dark-gray);
    margin-bottom: 2rem;
}

/* Search */
.search-container {
    margin-bottom: 2rem;
}

.search-box {
    display: flex;
    background: white;
    border-radius: var(--radius);
    padding: 0.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

.search-box i {
    padding: 0.75rem;
    color: var(--gray);
}

.search-box input {
    flex: 1;
    border: none;
    padding: 0.75rem;
    font-size: 1rem;
    outline: none;
}

.search-box button {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: calc(var(--radius) - 2px);
    font-weight: 600;
    cursor: pointer;
}

.search-suggestions {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.search-suggestions span {
    color: var(--gray);
    font-size: 0.875rem;
}

.search-suggestions a {
    font-size: 0.875rem;
    color: var(--text);
    background-color: var(--light-gray);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
}

.search-suggestions a:hover {
    background-color: var(--primary);
    color: white;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* Calculator Illustration */
.calculator-illustration {
    background: white;
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    transform: perspective(1000px) rotateY(-10deg);
    transition: var(--transition);
}

.calculator-illustration:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.calc-display {
    background-color: var(--light-gray);
    padding: 1rem;
    border-radius: calc(var(--radius) - 2px);
    font-family: 'Courier New', monospace;
    font-size: 1.5rem;
    text-align: right;
    margin-bottom: 1rem;
    color: var(--primary);
    font-weight: bold;
}

.calc-buttons {
    display: grid;
    gap: 0.5rem;
}

.calc-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--text);
}

.calc-row div {
    padding: 0.75rem;
    background-color: var(--light-gray);
    border-radius: calc(var(--radius) - 4px);
    text-align: center;
    transition: var(--transition);
}

.calc-row div:hover {
    background-color: var(--primary);
    color: white;
}

/* ===== SECTION STYLES ===== */
section {
    padding: 4rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header p {
    color: var(--gray);
    font-size: 1.125rem;
}

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

.calc-card {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.calc-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    border-color: var(--primary);
}

.calc-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: white;
    font-size: 1.5rem;
}

.calc-title {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.calc-desc {
    color: var(--dark-gray);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    min-height: 40px;
}

.calc-btn {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: calc(var(--radius) - 2px);
    font-weight: 600;
    width: 100%;
    text-align: center;
}

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

/* ===== FEATURES ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: var(--radius);
    background-color: white;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--accent), #34d399);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.75rem;
}

/* ===== CATEGORIES ===== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

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

.category-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.category-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.75rem;
    color: white;
}

.category-icon.financial {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
}

.category-icon.math {
    background: linear-gradient(135deg, #8b5cf6, #a78bfa);
}

.category-icon.construction {
    background: linear-gradient(135deg, #10b981, #34d399);
}

.category-icon.health {
    background: linear-gradient(135deg, #ef4444, #f87171);
}

.category-icon.conversion {
    background: linear-gradient(135deg, #3b82f6, #60a5fa);
}

.category-card h3 {
    margin-bottom: 0.5rem;
}

.category-card p {
    color: var(--dark-gray);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.count {
    font-size: 0.75rem;
    color: var(--gray);
    background-color: var(--light-gray);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
}

/* ===== ABOUT ===== */
.about {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--dark-gray);
    color: white;
}

.footer-main {
    padding: 3rem 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
}

.footer-title {
    font-size: 1.5rem;
    color: white;
    margin-bottom: 0.5rem;
}

.footer-desc {
    color: var(--gray);
    margin-bottom: 1.5rem;
}

.copyright {
    color: var(--gray);
    font-size: 0.875rem;
}

.footer-col h4 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--gray);
}

.footer-links a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin: 1.5rem 0;
}

.social-link {
    width: 40px;
    height: 40px;
    background-color: #4b5563;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.social-link:hover {
    background-color: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.affiliate-note {
    font-size: 0.75rem;
    color: var(--gray);
    margin-top: 1rem;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-list {
        gap: 1rem;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .dropdown {
        min-width: 300px;
        left: -100px;
    }
    
    .dropdown-categories {
        grid-template-columns: 1fr;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .search-suggestions {
        justify-content: center;
    }
}
/* ===== CALCULATORS PAGE SPECIFIC STYLES ===== */
.page-header {
    padding: 3rem 0;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    text-align: center;
}

.page-header h1 {
    font-size: 2.75rem;
    margin-bottom: 1rem;
}

.page-header p {
    color: var(--dark-gray);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.category-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.category-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    min-width: 100px;
    transition: var(--transition);
}

.category-nav-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.category-nav-item i {
    font-size: 1.5rem;
    color: var(--primary);
}

.category-nav-item span {
    font-size: 0.875rem;
    font-weight: 600;
}

/* Category Section */
.category-section {
    padding: 4rem 0;
}

.category-section:nth-child(even) {
    background-color: var(--light-gray);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.category-icon-large {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.category-icon-large.financial {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
}

.category-icon-large.math {
    background: linear-gradient(135deg, #8b5cf6, #a78bfa);
}

.category-icon-large.construction {
    background: linear-gradient(135deg, #10b981, #34d399);
}

.category-icon-large.health {
    background: linear-gradient(135deg, #ef4444, #f87171);
}

.category-icon-large.conversion {
    background: linear-gradient(135deg, #3b82f6, #60a5fa);
}

.category-header h2 {
    margin-bottom: 0.5rem;
}

.category-header p {
    color: var(--gray);
    margin-bottom: 0;
}

/* Summary Section */
.summary {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.summary-card {
    background: white;
    border-radius: var(--radius);
    padding: 3rem;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    max-width: 800px;
    margin: 0 auto;
}

.summary-card h2 {
    color: var(--text);
    margin-bottom: 1rem;
}

.summary-card p {
    color: var(--dark-gray);
    margin-bottom: 2rem;
}

.summary-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin: 2rem 0;
}

.summary-stat {
    text-align: center;
}

.summary-number {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
}

.summary-label {
    font-size: 0.875rem;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}