/* ============================================
   CalcGrip - Modern Financial Calculator Hub
   Design System & Styles
   ============================================ */

/* CSS Variables */
:root {
    /* Primary Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    /* Accent Colors */
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --accent-orange: #f97316;
    --accent-green: #10b981;
    --accent-teal: #14b8a6;
    --accent-cyan: #06b6d4;
    
    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Semantic Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.625rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

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

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--gray-900);
}

.logo svg {
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    list-style: none;
}

.nav-links a {
    display: block;
    padding: var(--space-2) var(--space-4);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.nav-links a:hover {
    color: var(--gray-900);
    background: var(--gray-100);
}

.nav-links a.active {
    color: var(--primary-600);
    background: var(--primary-50);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--space-4);
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        width: 100%;
        padding: var(--space-3) var(--space-4);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    position: relative;
    padding: 140px 0 100px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        var(--primary-50) 0%, 
        #e0e7ff 25%, 
        #ddd6fe 50%, 
        #fce7f3 75%,
        var(--primary-50) 100%
    );
    opacity: 0.6;
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(236, 72, 153, 0.05) 0%, transparent 50%);
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-sm);
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    color: var(--gray-900);
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto var(--space-8);
    line-height: 1.7;
}

/* Search Box */
.search-box {
    position: relative;
    max-width: 560px;
    margin: 0 auto var(--space-10);
}

.search-icon {
    position: absolute;
    left: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
}

.search-box input {
    width: 100%;
    padding: var(--space-4) var(--space-4) var(--space-4) 52px;
    font-size: 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-xl);
    background: white;
    transition: all var(--transition);
    box-shadow: var(--shadow-md);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15), var(--shadow-lg);
}

.search-box input::placeholder {
    color: var(--gray-400);
}

.search-btn {
    position: absolute;
    right: var(--space-2);
    top: 50%;
    transform: translateY(-50%);
    padding: var(--space-2) var(--space-5);
    background: var(--primary-600);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.search-btn:hover {
    background: var(--primary-700);
}

/* Hero Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-12);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: var(--space-1);
}

@media (max-width: 640px) {
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero-stats {
        gap: var(--space-6);
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .search-btn {
        display: none;
    }
}

/* ============================================
   SECTION HEADERS
   ============================================ */

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-header.light {
    color: white;
}

.section-header.light p {
    color: rgba(255, 255, 255, 0.7);
}

.section-tag {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    background: var(--primary-100);
    color: var(--primary-700);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

.section-header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--gray-500);
    max-width: 500px;
    margin: 0 auto;
}

/* ============================================
   CATEGORIES SECTION
   ============================================ */

.categories-section {
    padding: var(--space-24) 0;
    background: white;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.category-card {
    position: relative;
    display: block;
    background: white;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition-slow);
    border: 1px solid var(--gray-100);
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: transparent;
}

.card-bg {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.mortgage-bg {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
}

.loans-bg {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
}

.investment-bg {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
}

.tax-bg {
    background: linear-gradient(135deg, #fce7f3 0%, #fbcfe8 100%);
}

.credit-bg {
    background: linear-gradient(135deg, #ede9fe 0%, #ddd6fe 100%);
}

.general-bg {
    background: linear-gradient(135deg, #ccfbf1 0%, #99f6e4 100%);
}

.category-card:hover .card-bg {
    opacity: 1;
}

.card-content {
    position: relative;
    z-index: 1;
    padding: var(--space-8);
}

.category-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-5);
    transition: all var(--transition);
}

[data-category="mortgage"] .category-icon {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
}

[data-category="loans"] .category-icon {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

[data-category="investment"] .category-icon {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

[data-category="tax"] .category-icon {
    background: linear-gradient(135deg, #ec4899, #db2777);
    color: white;
}

[data-category="credit"] .category-icon {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
    color: white;
}

[data-category="general"] .category-icon {
    background: linear-gradient(135deg, #14b8a6, #0d9488);
    color: white;
}

.category-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.category-card p {
    font-size: 0.9375rem;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: var(--space-6);
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.calculator-count {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-400);
}

.explore-link {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-600);
    transition: gap var(--transition-fast);
}

.category-card:hover .explore-link {
    gap: var(--space-2);
}

@media (max-width: 1024px) {
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .card-content {
        padding: var(--space-6);
    }
}

/* ============================================
   POPULAR SECTION
   ============================================ */

.popular-section {
    padding: var(--space-24) 0;
    background: var(--gray-50);
}

.popular-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
}

.popular-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-5);
    background: white;
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-100);
    transition: all var(--transition);
}

.popular-card:hover {
    background: var(--gray-900);
    border-color: var(--gray-900);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.popular-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.mortgage-icon {
    background: #dbeafe;
    color: #1d4ed8;
}

.loans-icon {
    background: #d1fae5;
    color: #059669;
}

.investment-icon {
    background: #fef3c7;
    color: #d97706;
}

.tax-icon {
    background: #fce7f3;
    color: #db2777;
}

.credit-icon {
    background: #ede9fe;
    color: #7c3aed;
}

.retirement-icon {
    background: #ccfbf1;
    color: #0d9488;
}

.debt-icon {
    background: #fee2e2;
    color: #dc2626;
}

.popular-card:hover .popular-icon {
    background: rgba(255, 255, 255, 0.15);
    color: white;
}

.popular-content {
    flex: 1;
    min-width: 0;
}

.popular-content h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.popular-card:hover .popular-content h4 {
    color: white;
}

.popular-content p {
    font-size: 0.8125rem;
    color: var(--gray-500);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.popular-card:hover .popular-content p {
    color: rgba(255, 255, 255, 0.7);
}

.popular-arrow {
    color: var(--gray-300);
    opacity: 0;
    transform: translateX(-10px);
    transition: all var(--transition);
}

.popular-card:hover .popular-arrow {
    color: white;
    opacity: 1;
    transform: translateX(0);
}

@media (max-width: 1024px) {
    .popular-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .popular-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   FEATURES SECTION
   ============================================ */

.features-section {
    padding: var(--space-24) 0;
    background: linear-gradient(135deg, var(--gray-900) 0%, #1a1f36 100%);
    position: relative;
    overflow: hidden;
}

.features-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
    position: relative;
    z-index: 1;
}

.feature-card {
    padding: var(--space-8);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-2xl);
    transition: all var(--transition);
}

.feature-card:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-5);
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--space-3);
}

.feature-card p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
}

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ALL CALCULATORS SECTION
   ============================================ */

.all-calculators-section {
    padding: var(--space-24) 0;
    background: white;
}

.calculators-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.calculator-group h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--gray-100);
}

.calculator-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.calculator-links a {
    display: block;
    padding: var(--space-2) 0;
    font-size: 0.9375rem;
    color: var(--gray-600);
    transition: all var(--transition-fast);
}

.calculator-links a:hover {
    color: var(--primary-600);
    padding-left: var(--space-2);
}

@media (max-width: 1024px) {
    .calculators-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .calculators-list {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   CTA SECTION
   ============================================ */

.cta-section {
    padding: var(--space-20) 0;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--accent-purple) 100%);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--space-4);
}

.cta-content p {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-8);
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    background: white;
    color: var(--primary-600);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-xl);
    transition: all var(--transition);
    box-shadow: var(--shadow-lg);
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2xl);
}

@media (max-width: 640px) {
    .cta-content h2 {
        font-size: 2rem;
    }
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
    padding: var(--space-16) 0 var(--space-8);
    background: var(--gray-900);
    color: white;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-section.brand {
    max-width: 320px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    font-weight: 700;
    font-size: 1.25rem;
}

.footer-section p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.7;
}

.footer-section h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: var(--space-4);
}

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

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

.footer-section a {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.4);
}

@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-8);
    }
}

@media (max-width: 640px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   CALCULATOR PAGE STYLES
   ============================================ */

.calculator-page {
    padding: 100px 0 var(--space-16);
}

.calculator-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--space-8);
}

.calculator-header {
    margin-bottom: var(--space-8);
}

.calculator-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
}

.calculator-header .description {
    font-size: 1.125rem;
    color: var(--gray-500);
    max-width: 600px;
}

.calculator-card {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--gray-100);
}

.input-section {
    padding: var(--space-8);
    border-bottom: 1px solid var(--gray-100);
}

.input-section h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-6);
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

.input-group input,
.input-group select {
    padding: var(--space-3) var(--space-4);
    font-size: 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    background: white;
    transition: all var(--transition-fast);
    width: 100%;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.input-prefix,
.input-suffix,
.input-prefix-suffix {
    position: relative;
    display: flex;
    align-items: center;
}

.input-prefix .prefix,
.input-suffix .suffix,
.input-prefix-suffix .prefix,
.input-prefix-suffix .suffix {
    position: absolute;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-400);
    pointer-events: none;
}

.input-prefix .prefix,
.input-prefix-suffix .prefix {
    left: var(--space-4);
}

.input-suffix .suffix,
.input-prefix-suffix .suffix {
    right: var(--space-4);
}

.input-prefix input {
    padding-left: 36px;
}

.input-suffix input {
    padding-right: 36px;
}

.input-prefix-suffix input {
    padding-left: 36px;
    padding-right: 36px;
}

.input-help {
    font-size: 0.75rem;
    color: var(--gray-400);
}

.calculate-btn {
    display: block;
    width: 100%;
    padding: var(--space-4);
    margin-top: var(--space-6);
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    color: white;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.calculate-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.results-section {
    padding: var(--space-8);
    background: linear-gradient(135deg, var(--primary-50), #e0e7ff);
}

.results-section h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-6);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}

.result-card {
    padding: var(--space-5);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.result-card.highlight {
    background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
    color: white;
}

.result-card.highlight .result-label {
    color: rgba(255, 255, 255, 0.7);
}

.result-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    margin-bottom: var(--space-1);
}

.result-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
}

.result-card.highlight .result-value {
    color: white;
}

.content-section {
    padding: var(--space-8);
}

.content-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
}

.content-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: var(--space-6) 0 var(--space-3);
}

.content-section p {
    font-size: 1rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: var(--space-4);
}

.content-section ul {
    list-style: none;
    padding-left: 0;
}

.content-section li {
    position: relative;
    padding-left: var(--space-6);
    margin-bottom: var(--space-2);
    font-size: 1rem;
    color: var(--gray-600);
}

.content-section li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: 700;
}

/* Sidebar */
.calculator-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.ad-container {
    min-height: 250px;
    background: var(--gray-100);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    font-size: 0.875rem;
}

.related-calculators {
    padding: var(--space-6);
    background: white;
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-100);
}

.related-calculators h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
}

.related-calculators ul {
    list-style: none;
}

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

.related-calculators a {
    display: block;
    padding: var(--space-2) 0;
    font-size: 0.9375rem;
    color: var(--gray-600);
    transition: all var(--transition-fast);
}

.related-calculators a:hover {
    color: var(--primary-600);
    padding-left: var(--space-2);
}

@media (max-width: 1024px) {
    .calculator-layout {
        grid-template-columns: 1fr;
    }
    
    .calculator-sidebar {
        display: none;
    }
    
    .input-grid {
        grid-template-columns: 1fr;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ADS
   ============================================ */

.ad-container-top,
.ad-container-bottom {
    margin: var(--space-6) 0;
    min-height: 90px;
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

.category-card,
.popular-card,
.feature-card {
    animation: fadeIn 0.6s ease forwards;
}

/* Stagger animation delays */
.category-card:nth-child(1) { animation-delay: 0.05s; }
.category-card:nth-child(2) { animation-delay: 0.1s; }
.category-card:nth-child(3) { animation-delay: 0.15s; }
.category-card:nth-child(4) { animation-delay: 0.2s; }
.category-card:nth-child(5) { animation-delay: 0.25s; }
.category-card:nth-child(6) { animation-delay: 0.3s; }

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .site-header,
    .calculator-sidebar,
    .ad-container,
    .cta-section,
    .site-footer {
        display: none !important;
    }
    
    .calculator-page {
        padding-top: 20px;
    }
}