/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* AI-Style Color Scheme */
    --background: #0a0a0f;
    --foreground: #e4e4e7;
    --card: #111118;
    --card-foreground: #e4e4e7;
    --primary: #3b82f6;
    --primary-foreground: #ffffff;
    --secondary: #1e1e2e;
    --secondary-foreground: #a1a1aa;
    --muted: #1e1e2e;
    --muted-foreground: #71717a;
    --accent: #6366f1;
    --accent-foreground: #ffffff;
    --destructive: #ef4444;
    --border: #27272a;
    --input: #18181b;
    --ring: #3b82f6;
    
    /* AI-specific colors */
    --ai-cyan: #06b6d4;
    --ai-purple: #8b5cf6;
    --ai-blue: #3b82f6;
    --ai-gradient-start: #3b82f6;
    --ai-gradient-end: #8b5cf6;
    
    /* Spacing */
    --container-padding: 1rem;
    --section-padding: 4rem 0;
    --card-padding: 2rem;
    
    /* Border radius */
    --radius: 0.75rem;
    --radius-sm: 0.5rem;
    --radius-lg: 1rem;
    
    /* 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);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: linear-gradient(135deg, var(--background) 0%, #111118 50%, #0f0f1a 100%);
    color: var(--foreground);
    line-height: 1.6;
    min-height: 100vh;
}

.font-mono {
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* AI-Style Components */
.ai-gradient {
    background: linear-gradient(135deg, var(--ai-gradient-start), var(--ai-gradient-end));
}

.ai-gradient-text {
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan), var(--ai-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.ai-glow {
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3), 0 0 40px rgba(59, 130, 246, 0.1);
}

.ai-glow-cyan {
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3), 0 0 40px rgba(6, 182, 212, 0.1);
}

.ai-glow-purple {
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.3), 0 0 40px rgba(139, 92, 246, 0.1);
}

.ai-border {
    border: 1px solid rgba(59, 130, 246, 0.3);
    background: rgba(59, 130, 246, 0.05);
}

.ai-card {
    background: rgba(17, 17, 24, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.2);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
}

.ai-section {
    background: rgba(17, 17, 24, 0.6);
    border: 1px solid rgba(59, 130, 246, 0.1);
    backdrop-filter: blur(5px);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-icon {
    padding: 0.5rem;
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan));
    border-radius: var(--radius-sm);
    color: white;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan), var(--ai-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 1rem;
}

.nav-link {
    background: none;
    border: none;
    color: var(--muted-foreground);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.nav-link:hover {
    color: var(--ai-blue);
    background: rgba(59, 130, 246, 0.1);
}

.nav-link.active {
    color: var(--ai-blue);
    background: rgba(59, 130, 246, 0.2);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

/* Page Management */
.page {
    display: none;
    padding-top: 5rem;
}

.page.active {
    display: block;
}

/* Hero Section */
.hero {
    padding: var(--section-padding);
    text-align: center;
    background: radial-gradient(circle at center, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan), var(--ai-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--muted-foreground);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Calculator Section */
.calculator-section {
    padding: var(--section-padding);
}

.calculator-card {
    background: rgba(17, 17, 24, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.2);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: var(--card-padding);
    box-shadow: var(--shadow-xl);
    margin-bottom: 2rem;
}

.calculator-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
}

.calculator-header svg {
    color: var(--ai-blue);
}

.calculator-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--ai-blue);
}

.calculator-content {
    display: grid;
    gap: 2rem;
}

.input-section h3,
.target-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--ai-cyan);
    margin-bottom: 1rem;
}

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

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

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

.input-group input {
    background: rgba(24, 24, 27, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    color: var(--foreground);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--ai-blue);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.input-group input::placeholder {
    color: var(--muted-foreground);
}

.button-section {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan));
    border: none;
    color: white;
    padding: 0.75rem 2rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: rgba(30, 30, 46, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: var(--foreground);
    padding: 0.75rem 2rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--ai-blue);
}

/* Results Section */
.results-card {
    background: rgba(17, 17, 24, 0.8);
    border: 1px solid rgba(6, 182, 212, 0.3);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: var(--card-padding);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
}

.results-card h3 {
    color: var(--ai-cyan);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.result-value {
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-sm);
    padding: 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--ai-cyan);
    text-align: center;
    margin-bottom: 2rem;
}

.step-by-step {
    background: rgba(17, 17, 24, 0.6);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
}

.step-by-step ol {
    list-style: none;
    counter-reset: step-counter;
}

.step-by-step li {
    counter-increment: step-counter;
    margin-bottom: 0.75rem;
    padding-left: 2rem;
    position: relative;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
}

.step-by-step li::before {
    content: counter(step-counter) ".";
    position: absolute;
    left: 0;
    color: var(--ai-blue);
    font-weight: 600;
}

.hidden {
    display: none !important;
}

/* Help Guide */
.help-guide {
    padding: var(--section-padding);
    background: rgba(17, 17, 24, 0.3);
}

.help-guide h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.guide-card {
    background: rgba(17, 17, 24, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.guide-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
    border-color: var(--ai-blue);
}

.guide-number {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    margin: 0 auto 1.5rem;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
}

.guide-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--ai-blue);
    margin-bottom: 1rem;
}

.guide-card p {
    color: var(--muted-foreground);
    line-height: 1.6;
}

/* Educational Content */
.educational-content {
    padding: var(--section-padding);
}

.content-card {
    background: rgba(17, 17, 24, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius);
    padding: var(--card-padding);
    margin-bottom: 3rem;
    backdrop-filter: blur(10px);
}

.content-card h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--ai-blue);
    margin-bottom: 2rem;
    text-align: center;
}

.steps-grid {
    display: grid;
    gap: 2rem;
}

.step-card {
    background: rgba(30, 30, 46, 0.6);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    display: flex;
    gap: 1rem;
}

.step-number {
    width: 2.5rem;
    height: 2.5rem;
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.step-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--ai-blue);
    margin-bottom: 0.5rem;
}

.step-card p {
    color: var(--muted-foreground);
    line-height: 1.6;
}

/* Formula Section */
.formula-section {
    text-align: center;
}

.formula-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--ai-cyan);
    margin-bottom: 1.5rem;
}

.formula-display {
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-sm);
    padding: 2rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--ai-cyan);
    margin-bottom: 2rem;
}

.formula-explanation h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--ai-blue);
    margin-bottom: 1.5rem;
}

.component-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    text-align: left;
}

.component-card {
    background: rgba(30, 30, 46, 0.6);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
}

.component-card h5 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--ai-blue);
    margin-bottom: 0.5rem;
}

.component-card p {
    color: var(--muted-foreground);
    font-size: 0.875rem;
    line-height: 1.5;
}

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

.feature-card {
    background: rgba(30, 30, 46, 0.6);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-sm);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
    border-color: var(--ai-blue);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--ai-blue);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--muted-foreground);
    line-height: 1.6;
}

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

.faq-item {
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    background: rgba(30, 30, 46, 0.6);
    border: none;
    color: var(--foreground);
    padding: 1.5rem;
    text-align: left;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--ai-blue);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--ai-blue);
    transition: transform 0.3s ease;
}

.faq-question.active::after {
    transform: rotate(45deg);
}

.faq-answer {
    background: rgba(17, 17, 24, 0.8);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-answer.active {
    padding: 1.5rem;
    max-height: 200px;
}

.faq-answer p {
    color: var(--muted-foreground);
    line-height: 1.6;
    margin: 0;
}

/* Page Headers */
.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan), var(--ai-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

/* Footer */
.footer {
    background: rgba(17, 17, 24, 0.9);
    border-top: 1px solid rgba(59, 130, 246, 0.2);
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

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

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

.footer-icon {
    padding: 0.5rem;
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan));
    border-radius: var(--radius-sm);
    color: white;
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--ai-blue), var(--ai-cyan), var(--ai-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-links h3,
.footer-features h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--ai-blue);
    margin-bottom: 1rem;
}

.footer-link {
    background: none;
    border: none;
    color: var(--muted-foreground);
    font-size: 0.875rem;
    cursor: pointer;
    transition: color 0.3s ease;
    display: block;
    margin-bottom: 0.5rem;
    text-align: left;
    padding: 0;
}

.footer-link:hover {
    color: var(--ai-blue);
}

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

.footer-features li {
    color: var(--muted-foreground);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1rem;
}

.footer-features li::before {
    content: '•';
    color: var(--ai-blue);
    position: absolute;
    left: 0;
}

.footer-bottom {
    border-top: 1px solid rgba(59, 130, 246, 0.2);
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    color: var(--muted-foreground);
    font-size: 0.875rem;
}

/* Animations */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(59, 130, 246, 0.3); }
    50% { box-shadow: 0 0 30px rgba(59, 130, 246, 0.5); }
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

.animate-pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .nav-link {
        font-size: 0.75rem;
        padding: 0.375rem 0.75rem;
    }
    
    .input-grid {
        grid-template-columns: 1fr;
    }
    
    .button-section {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 300px;
    }
    
    .guide-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .component-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 0.75rem;
        --card-padding: 1.5rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .calculator-header {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
    
    .step-card {
        flex-direction: column;
        text-align: center;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background);
}

::-webkit-scrollbar-thumb {
    background: var(--ai-blue);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--ai-cyan);
}

/* Focus Styles for Accessibility */
button:focus,
input:focus {
    outline: 2px solid var(--ai-blue);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .navbar,
    .footer {
        display: none;
    }
    
    .page {
        display: block !important;
        padding-top: 0;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .ai-card,
    .content-card,
    .calculator-card {
        border: 1px solid #ccc;
        background: white;
    }
}