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

/* Root Variables for Consistent Design */
:root {
    --primary-color: #4F46E5;
    --primary-dark: #3730A3;
    --secondary-color: #7C3AED;
    --accent-color: #06B6D4;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --background-primary: #FFFFFF;
    --background-secondary: #F9FAFB;
    --background-tertiary: #F3F4F6;
    --border-color: #E5E7EB;
    --border-light: #F3F4F6;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-secondary);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Performance Optimizations */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

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

/* Focus Styles for Accessibility */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Layout Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 640px) {
    .container {
        padding: 0 1.5rem;
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 2rem;
    }
}

/* New Header Styles */
.new-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.header-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: white;
    text-decoration: none;
    transition: var(--transition-fast);
}

.logo-link:hover {
    transform: translateY(-1px);
}

.logo-icon svg {
    width: 40px;
    height: 40px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.125rem;
    letter-spacing: -0.025em;
}

.tagline {
    font-size: 0.75rem;
    opacity: 0.9;
    font-weight: 500;
}

.main-nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.main-nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    position: relative;
}

.main-nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.main-nav a:active {
    transform: translateY(0);
}

/* Dropdown Menu Styles */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    color: white;
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    display: block;
}

.dropdown-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 280px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    border-radius: 8px;
    padding: 10px 0;
    z-index: 1000;
    margin-top: 5px;
}

.nav-dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 12px 20px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.3s;
    border-radius: 0;
    transform: none;
}

.dropdown-menu a:hover {
    background-color: #f8f9fa;
    color: #667eea;
    transform: none;
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid rgba(255, 255, 255, 0.3);
    position: relative;
    z-index: 10000;
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
    align-items: center;
}

.mobile-menu-toggle span {
    width: 22px;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: all 0.3s ease;
    display: block;
}

.mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: scale(1.05);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #667eea;
    background-image: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 6rem 2rem 2rem;
    gap: 1rem;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease-in-out;
    z-index: 9999;
}

/* Ensure solid background for mobile menu */
.mobile-nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #667eea;
    background-image: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: -1;
}

/* Force solid background on mobile nav active state */
.mobile-nav.active {
    display: flex;
    opacity: 1;
    visibility: visible;
    background-color: #667eea !important;
    background-image: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
}

.mobile-nav.active {
    display: flex;
    opacity: 1;
    visibility: visible;
}

.mobile-nav a {
    color: white;
    padding: 1rem 2rem;
    border-radius: 12px;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 1.1rem;
    text-align: center;
    width: 100%;
    max-width: 280px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    background-color: rgba(255, 255, 255, 0.25);
    text-decoration: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    backdrop-filter: none;
}

.mobile-nav a:hover,
.mobile-nav a:focus {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Prevent body scroll when mobile menu is open */
body.mobile-menu-open {
    overflow: hidden;
}

/* Hero Section */
.hero-section {
    background: var(--background-primary);
    padding: 4rem 0;
    margin-bottom: 3rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

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

.hero-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    letter-spacing: -0.025em;
    line-height: 1.2;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--background-tertiary);
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.feature-icon {
    font-size: 1.25rem;
}

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

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: var(--transition-fast);
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

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

/* Calculator Section */
.calculator-section {
    background: var(--background-primary);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    margin-bottom: 4rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
}

.calculator-container {
    max-width: 900px;
    margin: 0 auto;
}

/* Shape Selection */
.shape-selection h3 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.shape-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.shape-btn {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 1.5rem 1rem;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.shape-btn:hover {
    border-color: #667eea;
    background: #f0f4ff;
    transform: translateY(-2px);
}

.shape-btn.active {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.shape-icon {
    font-size: 2rem;
}

.shape-btn span {
    font-weight: 500;
    font-size: 0.9rem;
}

/* Calculator Form */
.calculator-form {
    border-top: 2px solid #e9ecef;
    padding-top: 2rem;
    margin-top: 2rem;
}

.form-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.form-header h3 {
    color: #2c3e50;
    font-size: 1.5rem;
}

.unit-selector {
    display: flex;
    gap: 1rem;
    background: #f8f9fa;
    padding: 0.5rem;
    border-radius: 8px;
}

.unit-selector label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: background 0.3s;
}

.unit-selector label:hover {
    background: #e9ecef;
}

.form-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

/* Input Styles */
.inputs-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.input-group label {
    font-weight: 500;
    color: #2c3e50;
}

.input-group input {
    padding: 0.75rem;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
}

.calculation-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.calculation-options label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.action-buttons {
    display: flex;
    gap: 1rem;
}

.btn-primary, .btn-secondary {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f8f9fa;
    color: #666;
    border: 2px solid #e9ecef;
}

.btn-secondary:hover {
    background: #e9ecef;
}

/* Formula Section */
.formula-section h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.formula-display {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    color: #2c3e50;
}

/* Results Section */
.results-section {
    background: #f0f8ff;
    border: 2px solid #667eea;
    border-radius: 10px;
    padding: 2rem;
    margin-top: 2rem;
}

.results-section h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.result-item {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-label {
    font-weight: 500;
    color: #2c3e50;
}

.result-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: #667eea;
}

.steps-container {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 2px solid #e9ecef;
}

.steps-container h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.calculation-step {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    font-family: 'Courier New', monospace;
}

/* Formulas Section */
.formulas-section {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.formulas-section h2 {
    color: #2c3e50;
    margin-bottom: 2rem;
    text-align: center;
    font-size: 2rem;
}

.formulas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.formula-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    transition: transform 0.3s;
}

.formula-card:hover {
    transform: translateY(-2px);
}

.formula-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.formula {
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    color: #667eea;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Examples Section */
.examples-section {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.examples-section h2 {
    color: #2c3e50;
    margin-bottom: 2rem;
    text-align: center;
    font-size: 2rem;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.example-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 10px;
    border-left: 4px solid #764ba2;
}

.example-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.example-card p {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* FAQ Section */
.faq-section {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.faq-section h2 {
    color: #2c3e50;
    margin-bottom: 2rem;
    text-align: center;
    font-size: 2rem;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #e9ecef;
}

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

.faq-item h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.faq-item p {
    color: #666;
    line-height: 1.6;
}

/* Footer */
.main-footer {
    background: #2c3e50;
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: #667eea;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #bbb;
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #34495e;
    color: #bbb;
}

/* Responsive Design */
/* Force mobile menu to show on small screens */
@media (max-width: 768px) {
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        position: relative;
    }
    
    .main-nav {
        display: none !important;
    }
    
    .mobile-menu-toggle {
        display: flex !important;
        order: 2;
        z-index: 10001;
    }
    
    .logo {
        order: 1;
    }
}

/* Force mobile menu to show on very small screens too */
@media (max-width: 480px) {
    .main-nav {
        display: none !important;
    }
    
    .mobile-menu-toggle {
        display: flex !important;
    }
}
    
    .hero-section h2 {
        font-size: 2rem;
    }
    
    .form-content {
        grid-template-columns: 1fr;
    }
    
    .shape-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .form-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .calculator-section,
    .formulas-section,
    .examples-section,
    .faq-section {
        padding: 1.5rem;
    }
    
    .hero-section {
        padding: 2rem 0;
    }
    
    .hero-section h2 {
        font-size: 1.8rem;
    }
}
/* Sh
ape Selection */
.shape-selection h3 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.shape-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.shape-btn {
    background: var(--background-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

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

.shape-btn.active {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: var(--shadow-lg);
}

.shape-icon {
    font-size: 2rem;
    margin-bottom: 0.25rem;
}

.shape-btn span {
    font-size: 0.875rem;
    line-height: 1.3;
}

/* Calculator Form */
.calculator-form {
    border-top: 2px solid var(--border-light);
    padding-top: 2rem;
    margin-top: 2rem;
}

.form-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.form-header h3 {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 700;
}

.unit-selector {
    display: flex;
    gap: 0.5rem;
    background: var(--background-tertiary);
    padding: 0.25rem;
    border-radius: var(--radius-lg);
}

.unit-selector label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    font-size: 0.875rem;
    font-weight: 500;
}

.unit-selector label:hover {
    background: var(--background-primary);
}

.unit-selector input[type="radio"]:checked + span {
    background: var(--primary-color);
    color: white;
}

.form-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

/* Input Styles */
.inputs-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.input-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.input-group input,
.calc-input {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition-fast);
    background: var(--background-primary);
}

.input-group input:focus,
.calc-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.calculation-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--background-tertiary);
    border-radius: var(--radius-md);
}

.calculation-options label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
}

.action-buttons {
    display: flex;
    gap: 1rem;
}

#calculate-btn,
#clear-btn {
    flex: 1;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

#calculate-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
}

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

#clear-btn {
    background: var(--background-primary);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

#clear-btn:hover {
    background: var(--background-tertiary);
    border-color: var(--text-secondary);
}

/* Formula Section */
.formula-section h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 700;
}

.formula-display {
    background: var(--background-tertiary);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Results Section */
.results-section {
    background: linear-gradient(135deg, #EEF2FF 0%, #F3E8FF 100%);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-top: 2rem;
}

.results-section h3 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.result-item {
    background: var(--background-primary);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.result-label {
    font-weight: 600;
    color: var(--text-primary);
}

.result-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
}

.steps-container {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border-light);
}

.steps-container h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 700;
}

.calculation-step {
    background: var(--background-primary);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    font-size: 0.875rem;
    border-left: 3px solid var(--accent-color);
}

/* Content Sections */
.related-calculators-section,
.content-section,
.formulas-section,
.examples-section,
.faq-section {
    background: var(--background-primary);
    border-radius: var(--radius-xl);
    padding: 3rem 2rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-sm);
}

.section-description {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.related-calculators-section h2,
.content-section h2,
.formulas-section h2,
.examples-section h2,
.faq-section h2 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
}

/* Related Calculators Section */
.related-calculators {
    margin: 4rem 0;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--radius-xl);
}

.related-calculators h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
    font-size: 2.5rem;
    font-weight: 700;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 0 auto;
    max-width: 1200px;
}

.calculator-link {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    display: block;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 2px solid transparent;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.calculator-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.calculator-link:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
    border-color: #667eea;
    text-decoration: none;
}

.calculator-link:hover::before {
    transform: scaleX(1);
}

.calculator-link h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-weight: 600;
    line-height: 1.3;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.calculator-link p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Responsive styles for calculator grid */
@media (max-width: 768px) {
    .related-calculators {
        margin: 2rem 0;
        padding: 2rem 1rem;
    }
    
    .related-calculators h2 {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .calculator-link {
        padding: 1.5rem;
    }
    
    .calculator-link h3 {
        font-size: 1.1rem;
    }
}

/* Related Calculators Grid */
.related-calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.calculator-card {
    background: var(--background-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-light);
    transition: var(--transition-normal);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.calculator-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.calculator-card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 700;
    font-size: 1.25rem;
}

.calculator-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.card-cta {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.content-card {
    background: var(--background-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
}

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

.content-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.content-card p:last-child {
    margin-bottom: 0;
}

/* Formulas Grid */
.formulas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.formula-card {
    background: var(--background-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
    transition: var(--transition-fast);
}

.formula-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.formula {
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    font-size: 1.125rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    background: var(--background-primary);
    border-radius: var(--radius-sm);
}

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

/* Examples Grid */
.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.example-card {
    background: var(--background-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--secondary-color);
}

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

.example-card p {
    margin-bottom: 0.5rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

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

/* FAQ Section */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1rem;
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: var(--background-secondary);
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-fast);
}

.faq-question:hover {
    background: var(--background-tertiary);
}

.faq-question h3 {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.125rem;
    margin: 0;
}

.faq-toggle {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary-color);
    transition: var(--transition-fast);
}

.faq-question[aria-expanded="true"] .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition-normal);
}

.faq-question[aria-expanded="true"] + .faq-answer {
    max-height: 500px;
    padding: 0 1.5rem 1.5rem;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.faq-answer ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.faq-answer li {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

/* Footer */
.main-footer {
    background: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-weight: 700;
}

.footer-section p {
    color: #D1D5DB;
    line-height: 1.6;
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #D1D5DB;
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: 0.9rem;
}

.footer-section ul li a:hover {
    color: white;
    text-decoration: underline;
}

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

.social-links a {
    font-size: 1.5rem;
    transition: var(--transition-fast);
}

.social-links a:hover {
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-bottom p {
    color: #9CA3AF;
    font-size: 0.875rem;
}

.footer-note {
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .form-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .hero-features {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .calculator-section,
    .related-calculators-section,
    .content-section,
    .formulas-section,
    .examples-section,
    .faq-section {
        padding: 2rem 1.5rem;
    }
    
    .shape-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
    }
    
    .shape-btn {
        padding: 1rem 0.5rem;
    }
    
    .shape-icon {
        font-size: 1.5rem;
    }
    
    .shape-btn span {
        font-size: 0.75rem;
    }
    
    .form-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-features {
        grid-template-columns: 1fr;
    }
    
    .shape-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .related-calculators-grid,
    .content-grid,
    .formulas-grid,
    .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .tagline {
        display: none;
    }
}

/* Performance Optimizations */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .main-header,
    .mobile-menu-toggle,
    .mobile-nav,
    .main-footer,
    .cta-buttons {
        display: none;
    }
    
    .hero-section,
    .calculator-section,
    .related-calculators-section,
    .content-section,
    .formulas-section,
    .examples-section,
    .faq-section {
        box-shadow: none;
        border: 1px solid #ccc;
        margin-bottom: 1rem;
        padding: 1rem;
    }
}
/* 
Enhanced FAQ Styles */
.faq-item.active {
    border-color: var(--primary-color);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.15);
}

.faq-question::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--primary-color);
    transform: scaleY(0);
    transition: transform var(--transition-normal);
}

.faq-item.active .faq-question::before {
    transform: scaleY(1);
}

.faq-item.active .faq-question h3 {
    color: var(--primary-color);
}

.faq-toggle {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(102, 126, 234, 0.1);
}

.faq-question[aria-expanded="true"] .faq-toggle {
    color: white;
    background: var(--primary-color);
    transform: rotate(45deg);
}

.faq-answer {
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f2ff 100%);
}

/* Animation Classes */
.animate-in {
    animation: slideInUp 0.6s ease-out forwards;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading Button States */
.btn-primary.loading,
.calculate-btn.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn-primary.loading::after,
.calculate-btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Form Error Styles */
.error {
    border-color: #e74c3c !important;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1) !important;
}

.error-message {
    color: #e74c3c;
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: block;
}

/* Enhanced Dropdown Styles */
.nav-dropdown.active .dropdown-menu {
    display: block;
    animation: fadeInDown 0.3s ease-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile Menu Toggle Animation */
.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scale(0);
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

.mobile-menu-toggle.active {
    background: rgba(255, 255, 255, 0.3);
}/
* Contact Page Styles */
.contact-section {
    margin: 3rem 0;
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin: 2rem 0;
}

.contact-info h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.contact-info p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.contact-methods {
    margin-top: 2rem;
}

.contact-method {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.contact-method h4 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.contact-method p {
    color: #666;
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.contact-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
}

.contact-link:hover {
    text-decoration: underline;
    color: #5a67d8;
}

.contact-form-section {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
}

.contact-form-section h3 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #2c3e50;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.response-time {
    margin: 3rem 0;
}

.response-time h3 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.response-time .content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.response-time .content-card {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    border-left: 4px solid #667eea;
}

.response-time .content-card h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.response-time .content-card strong {
    color: #667eea;
    font-size: 1.1rem;
}

.response-time .content-card p {
    color: #666;
    line-height: 1.6;
    margin: 0.5rem 0;
}

/* Contact Page Responsive */
@media (max-width: 768px) {
    .contact-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact-form-section {
        padding: 1.5rem;
    }
    
    .contact-method {
        padding: 1rem;
    }
    
    .response-time .content-grid {
        grid-template-columns: 1fr;
    }
}/
* Brand/Logo Styles */
.brand {
    display: flex;
    align-items: center;
}

.brand-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: white;
    transition: transform 0.3s ease;
}

.brand-link:hover {
    transform: translateY(-2px);
}

.brand-icon {
    margin-right: 0.75rem;
}

.brand-icon svg {
    display: block;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin: 0;
}

.brand-tagline {
    font-size: 0.875rem;
    opacity: 0.9;
    font-weight: 500;
    margin: 0;
}

/* Desktop Navigation */
.desktop-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

/* Dropdown Styles */
.nav-dropdown {
    position: relative;
}

.dropdown-btn {
    background: none;
    border: none;
    color: white;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dropdown-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.dropdown-arrow {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

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

.dropdown-content {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    padding: 1rem 0;
    min-width: 250px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

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

.dropdown-content a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: #333;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

.dropdown-content a:hover {
    background: #f8f9fa;
    color: #667eea;
    padding-left: 2rem;
}

/* Mobile Toggle Button */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.mobile-toggle:hover {
    background: rgba(255, 255, 255, 0.15);
}

.hamburger-line {
    width: 24px;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scale(0);
}

.mobile-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #000;
    background: linear-gradient(135deg, #000 0%, #1a1a1a 100%);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 999;
    overflow-y: auto;
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu-content {
    padding: 6rem 2rem 2rem;
    max-width: 400px;
    margin: 0 auto;
}

.mobile-link {
    display: block;
    color: white;
    text-decoration: none;
    padding: 1rem 1.5rem;
    margin: 0.5rem 0;
    border-radius: 12px;
    font-weight: 500;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.mobile-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateX(10px);
}

/* Mobile Dropdown */
.mobile-dropdown {
    margin: 0.5rem 0;
}

.mobile-dropdown-btn {
    width: 100%;
    background: none;
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    font-weight: 500;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
}

.mobile-dropdown-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.mobile-dropdown-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    margin-top: 0.5rem;
}

.mobile-dropdown.active .mobile-dropdown-content {
    max-height: 400px;
}

.mobile-dropdown-content a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    font-weight: 400;
    transition: all 0.3s ease;
}

.mobile-dropdown-content a:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
    padding-left: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .desktop-nav {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .brand-name {
        font-size: 1.25rem;
    }
    
    .brand-tagline {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: 0 0.75rem;
    }
    
    .header-wrapper {
        padding: 0.75rem 0;
    }
    
    .brand-name {
        font-size: 1.1rem;
    }
    
    .mobile-menu-content {
        padding: 5rem 1.5rem 2rem;
    }
}