/* ============================================
   Helium AI Website - Styles
   Design System: Acid Neon
   ============================================ */

/* CSS Variables */
:root {
    /* Acid Neon Palette */
    --color-primary: #CCFF00;
    --color-secondary: #FF3CAC;
    --color-accent: #00D4FF;
    --color-bg: #0D0D0D;
    --color-bg-elevated: #1A1A2E;
    --color-surface: #16162A;
    --color-text: #FFFFFF;
    --color-text-muted: #A0A0B0;
    --color-border: rgba(255, 255, 255, 0.1);
    
    /* Typography */
    --font-display: 'Clash Display', sans-serif;
    --font-body: 'Chillax', sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.1;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 0.95rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-medium);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(204, 255, 0, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

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

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    background: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
}

.logo-icon {
    color: var(--color-primary);
    font-size: 1.75rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--color-text-muted);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-text);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 2rem 4rem;
    overflow: hidden;
}

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

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--color-primary);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--color-secondary);
    bottom: -100px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--color-accent);
    top: 50%;
    left: 30%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(0, 50px) scale(0.95); }
    75% { transform: translate(-50px, -25px) scale(1.05); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(204, 255, 0, 0.1);
    border: 1px solid rgba(204, 255, 0, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
}

.pulse {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.hero-title .line {
    display: block;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    max-width: 540px;
    margin-bottom: 2rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Hero Visual - Agent Interface */
.hero-visual {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
}

.agent-interface {
    width: 400px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.interface-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--color-border);
}

.dots {
    display: flex;
    gap: 6px;
}

.dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-secondary);
}

.dots span:nth-child(2) {
    background: var(--color-primary);
}

.dots span:nth-child(3) {
    background: var(--color-accent);
}

.interface-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
}

.interface-body {
    padding: 1.5rem;
}

.chat-message {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.chat-message:last-child {
    margin-bottom: 0;
}

.chat-message.user {
    flex-direction: row-reverse;
}

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

.chat-message.user .avatar {
    background: var(--color-secondary);
    color: white;
}

.chat-message.agent .avatar {
    background: var(--color-primary);
    color: var(--color-bg);
}

.message {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.75rem 1rem;
    border-radius: 12px;
    font-size: 0.875rem;
    max-width: 280px;
}

.chat-message.user .message {
    background: var(--color-secondary);
    color: white;
}

.thinking {
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.progress-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 75%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 2px;
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 75%; }
    100% { width: 100%; }
}

.tasks {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.task {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.task.completed {
    color: var(--color-primary);
}

.task.active {
    color: var(--color-accent);
}

/* Section Styles */
section {
    padding: 6rem 2rem;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem;
}

.section-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(204, 255, 0, 0.1);
    border: 1px solid rgba(204, 255, 0, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
}

/* Capabilities Section */
.capabilities {
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-elevated) 100%);
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

.capability-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 2rem;
    transition: all var(--transition-medium);
}

.capability-card:hover {
    transform: translateY(-4px);
    border-color: rgba(204, 255, 0, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.capability-icon {
    width: 56px;
    height: 56px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    color: var(--icon-color, var(--color-primary));
}

.capability-icon svg {
    width: 28px;
    height: 28px;
}

.capability-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.capability-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* How It Works Section */
.how-it-works {
    background: var(--color-bg);
}

.steps-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.step {
    display: grid;
    grid-template-columns: auto 1fr 1fr;
    gap: 2rem;
    align-items: center;
    padding: 2rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 20px;
}

.step-number {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 700;
    color: var(--color-primary);
    opacity: 0.3;
    line-height: 1;
}

.step-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.step-content p {
    color: var(--color-text-muted);
}

/* Step Visuals */
.input-demo {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    font-family: monospace;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.cursor {
    color: var(--color-primary);
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

.execution-flow {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.flow-node {
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
}

.flow-node.active {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
}

.flow-arrow {
    color: var(--color-text-muted);
    font-size: 1.25rem;
}

.deliverable-preview {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: rgba(204, 255, 0, 0.1);
    border: 1px solid rgba(204, 255, 0, 0.3);
    border-radius: 12px;
}

.file-icon {
    font-size: 1.5rem;
}

/* Use Cases Section */
.use-cases {
    background: linear-gradient(180deg, var(--color-bg-elevated) 0%, var(--color-bg) 100%);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

.use-case-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 220px;
    transition: all var(--transition-medium);
}

.use-case-card:hover {
    border-color: rgba(204, 255, 0, 0.3);
    transform: translateY(-4px);
}

.use-case-card.large {
    grid-column: span 2;
    flex-direction: row;
    align-items: center;
}

.use-case-tag {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background: rgba(255, 60, 172, 0.1);
    border: 1px solid rgba(255, 60, 172, 0.3);
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

.use-case-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.use-case-content p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.use-case-visual {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-demo {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    height: 120px;
}

.chart-demo .bar {
    width: 32px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
    border-radius: 4px 4px 0 0;
    animation: grow 1s ease-out forwards;
    transform-origin: bottom;
}

@keyframes grow {
    from { transform: scaleY(0); }
    to { transform: scaleY(1); }
}

/* Pricing Section */
.pricing {
    background: var(--color-bg);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: all var(--transition-medium);
}

.pricing-card:hover {
    transform: translateY(-4px);
}

.pricing-card.featured {
    border-color: var(--color-primary);
    background: linear-gradient(180deg, var(--color-surface) 0%, rgba(204, 255, 0, 0.05) 100%);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.375rem 1rem;
    background: var(--color-primary);
    color: var(--color-bg);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.75rem;
    border-radius: 100px;
}

.pricing-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
}

.currency {
    font-size: 1.5rem;
    font-weight: 600;
}

.amount {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
}

.period {
    color: var(--color-text-muted);
}

.pricing-features {
    list-style: none;
    margin-bottom: 2rem;
    flex: 1;
}

.pricing-features li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.pricing-features li::before {
    content: "✓";
    color: var(--color-primary);
    margin-right: 0.75rem;
    font-weight: 600;
}

.pricing-card .btn {
    width: 100%;
    justify-content: center;
}

/* CTA Section */
.cta {
    position: relative;
    padding: 6rem 2rem;
    text-align: center;
    overflow: hidden;
}

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

.cta h2 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin-bottom: 1rem;
}

.cta p {
    color: var(--color-text-muted);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.cta-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.cta-bg .gradient-orb {
    opacity: 0.3;
}

/* Footer */
.footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: 4rem 2rem 2rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand .logo {
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--color-text-muted);
    max-width: 300px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.footer-column a {
    display: block;
    color: var(--color-text-muted);
    padding: 0.375rem 0;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.footer-legal {
    display: flex;
    gap: 2rem;
}

.footer-legal a {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-visual {
        display: none;
    }
    
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .use-case-card.large {
        grid-column: span 2;
    }
    
    .step {
        grid-template-columns: auto 1fr;
    }
    
    .step-visual {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .capabilities-grid {
        grid-template-columns: 1fr;
    }
    
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    .use-case-card.large {
        grid-column: span 1;
        flex-direction: column;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* Scroll Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.capability-card,
.use-case-card,
.pricing-card {
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
}

.capability-card:nth-child(1) { animation-delay: 0.1s; }
.capability-card:nth-child(2) { animation-delay: 0.2s; }
.capability-card:nth-child(3) { animation-delay: 0.3s; }
.capability-card:nth-child(4) { animation-delay: 0.4s; }
.capability-card:nth-child(5) { animation-delay: 0.5s; }
.capability-card:nth-child(6) { animation-delay: 0.6s; }