/* CSS Variables with Golden Ratio Proportions */
:root {
    --phi: 1.618033988749;
    --golden-ratio: calc(1 / var(--phi));
    
    /* Color Palette - Dark Mode Default */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #f59e0b;
    --accent-color: #10b981;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-dark: #000000;
    --border-color: #2a2a2a;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing using Golden Ratio */
    --spacing-xs: 0.382rem;
    --spacing-sm: 0.618rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.618rem;
    --spacing-xl: 2.618rem;
    --spacing-2xl: 4.236rem;
    --spacing-3xl: 6.854rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --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);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.618;
    color: var(--text-primary);
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
    overflow-x: hidden;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    position: relative;
    min-height: 100vh;
}

/* Background Elements */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

/* Prominent Quantum Particles */
.quantum-particle {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    pointer-events: none;
    animation: quantum-float 12s ease-in-out infinite;
    opacity: 0.6;
}

.quantum-particle:nth-child(1) {
    background: var(--primary-color);
    top: 20%;
    left: 15%;
    animation-delay: 0s;
}

.quantum-particle:nth-child(2) {
    background: var(--secondary-color);
    top: 30%;
    right: 20%;
    animation-delay: 3s;
}

.quantum-particle:nth-child(3) {
    background: var(--accent-color);
    bottom: 25%;
    left: 25%;
    animation-delay: 6s;
}

.phi-spiral {
    position: absolute;
    top: 50%;
    right: -20%;
    width: 60%;
    height: 60%;
    background: conic-gradient(from 0deg, transparent, var(--primary-color), var(--secondary-color), var(--accent-color), transparent);
    border-radius: 50%;
    opacity: 0.05;
    animation: rotate 20s linear infinite;
}

.quantum-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 80%, var(--primary-color) 2px, transparent 2px),
        radial-gradient(circle at 80% 20%, var(--secondary-color) 2px, transparent 2px),
        radial-gradient(circle at 40% 40%, var(--accent-color) 2px, transparent 2px);
    background-size: 200px 200px, 250px 250px, 300px 300px;
    opacity: 0.08;
    animation: float 20s ease-in-out infinite;
}

.golden-ratio-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.08) 1px, transparent 1px),
        linear-gradient(rgba(245, 158, 11, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(245, 158, 11, 0.05) 1px, transparent 1px);
    background-size: calc(100% / var(--phi)) calc(100% / var(--phi)), calc(100% / var(--phi)) calc(100% / var(--phi)), calc(100% / var(--phi) * 2) calc(100% / var(--phi) * 2), calc(100% / var(--phi) * 2) calc(100% / var(--phi) * 2);
    opacity: 0.6;
}

/* Animations */
@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes quantum-float {
    0%, 100% { 
        transform: translateY(0px) translateX(0px) scale(1);
        opacity: 0.8;
    }
    25% { 
        transform: translateY(-30px) translateX(10px) scale(1.2);
        opacity: 1;
    }
    50% { 
        transform: translateY(-20px) translateX(-15px) scale(0.8);
        opacity: 0.6;
    }
    75% { 
        transform: translateY(-40px) translateX(20px) scale(1.1);
        opacity: 0.9;
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes quantum-fade {
    0% { opacity: 0; transform: scale(0.8); }
    100% { opacity: 1; transform: scale(1); }
}



/* Header */
.header {
    padding: var(--spacing-xl) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo-text {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.phi-symbol {
    color: var(--secondary-color);
    font-weight: 600;
    animation: pulse 3s ease-in-out infinite;
}

.logo-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
    font-weight: 400;
}

/* Main Content */
.main-content {
    padding: var(--spacing-3xl) 0;
    animation: quantum-fade 1s ease-out;
}

.hero-section {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-xl);
    letter-spacing: -0.02em;
}

.title-line {
    display: block;
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.6;
}

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

.feature-card {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

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

.feature-card:hover::before {
    opacity: 0.05;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    display: block;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

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

/* Newsletter Section */
.newsletter-section {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    padding: var(--spacing-2xl);
    border-radius: 24px;
    text-align: center;
    margin: var(--spacing-3xl) 0;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: visible;
    z-index: 5;
}

.newsletter-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, transparent, var(--primary-color), transparent);
    opacity: 0.02;
    animation: rotate 30s linear infinite;
    pointer-events: none;
    z-index: 1;
}

.newsletter-section h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.newsletter-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.125rem;
}

.newsletter-form {
    max-width: 500px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 10;
}

.input-group input {
    flex: 1;
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    font-family: var(--font-primary);
    transition: all 0.3s ease;
    background: var(--bg-secondary);
    color: var(--text-primary);
    outline: none;
    position: relative;
    z-index: 10;
    pointer-events: auto;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: var(--bg-primary);
}

.submit-btn {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    min-width: 140px;
}

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

.submit-btn:active {
    transform: translateY(0);
}

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid white;
    border-radius: 50%;
    animation: quantum-spin 1s linear infinite;
    display: none;
}

.submit-btn.loading .btn-loader {
    display: block;
}

.submit-btn.loading span {
    opacity: 0;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes quantum-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.form-note {
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Mathematical Elements */
.math-elements {
    position: absolute;
    bottom: var(--spacing-2xl);
    right: var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-lg);
    opacity: 0.3;
}

.phi-calculation {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.infinity-symbol {
    font-size: 2rem;
    color: var(--secondary-color);
    font-weight: 300;
    animation: pulse 4s ease-in-out infinite;
}

/* Footer */
.footer {
    margin-top: var(--spacing-3xl);
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--border-color);
}

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

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer-section p,
.footer-section li {
    color: var(--text-secondary);
    line-height: 1.6;
}

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

.footer-section li {
    margin-bottom: var(--spacing-sm);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

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

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loading-content {
    text-align: center;
    position: relative;
    transform: none;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
}

.quantum-loader {
    width: 60px;
    height: 60px;
    position: relative;
    margin: 0 auto var(--spacing-lg);
    transform: none;
}

.quantum-loader::before,
.quantum-loader::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px solid transparent;
}

.quantum-loader::before {
    border-top: 2px solid var(--primary-color);
    border-right: 2px solid var(--secondary-color);
    animation: quantum-spin 2s linear infinite;
}

.quantum-loader::after {
    border-bottom: 2px solid var(--accent-color);
    border-left: 2px solid var(--primary-color);
    animation: quantum-spin 2s linear infinite reverse;
}

.loading-content p {
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
    
    .main-content {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1.125rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .submit-btn {
        width: 100%;
    }
    
    .math-elements {
        position: static;
        margin-top: var(--spacing-xl);
        align-items: center;
        opacity: 0.5;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .newsletter-section {
        padding: var(--spacing-xl);
    }
    
    .newsletter-section h2 {
        font-size: 1.5rem;
    }
}

/* Light Mode Support */
@media (prefers-color-scheme: light) {
    :root {
        --text-primary: #1f2937;
        --text-secondary: #6b7280;
        --text-light: #9ca3af;
        --bg-primary: #ffffff;
        --bg-secondary: #f9fafb;
        --border-color: #e5e7eb;
    }
    
    body {
        background: linear-gradient(135deg, #f0f4f8 0%, #e2e8f0 100%);
    }
    
    .feature-card {
        background: var(--bg-secondary);
    }
    
    .input-group input {
        background: var(--bg-secondary);
        color: var(--text-primary);
    }
}